@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";*{margin:0;padding:0;box-sizing:border-box}:root{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;line-height:1.6;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;--color-primary: #667eea;--color-primary-dark: #5568d3;--color-secondary: #764ba2;--color-accent: #ffd700;--color-success: #10b981;--color-warning: #f59e0b;--color-danger: #ef4444;--icon-on-dark: rgba(255, 255, 255, .9);--icon-on-light: #6366f1;--icon-neutral: #6b7280;--icon-primary: #667eea;--icon-accent: #ffd700;--icon-success: #10b981;--icon-danger: #ef4444}.icon-on-dark{color:var(--icon-on-dark)}.icon-on-light{color:var(--icon-on-light)}.icon-neutral{color:var(--icon-neutral)}.icon-primary{color:var(--icon-primary)}.icon-accent{color:var(--icon-accent)}.icon-success{color:var(--icon-success)}.icon-danger{color:var(--icon-danger)}:root{background:linear-gradient(135deg,#667eea,#764ba2);background-attachment:fixed;min-height:100%}html{background:linear-gradient(135deg,#667eea,#764ba2);background-attachment:fixed;min-height:100%;margin:0;padding:0}body{background:linear-gradient(135deg,#667eea,#764ba2);background-attachment:fixed;min-height:100%;min-width:320px;margin:0;padding:0}#root{min-height:100vh;padding:0;padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom);padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}.app{min-height:100vh}.app{min-height:100vh;background:transparent}.desktop-only{display:none!important}@media(min-width:600px){.mobile-only{display:none!important}.desktop-only{display:flex!important}}@media screen and (orientation:landscape)and (max-width:900px){.puzzle-container:before,.puzzle-viewer-container:before{content:"";position:fixed;inset:0;background:#000000f2;z-index:9999;display:none;pointer-events:none}}@media(min-width:600px){#root{padding:.5rem 0}}@media(min-width:900px){#root{padding:1.5rem 0}}.confirmation-overlay{position:fixed;inset:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:flex-end;justify-content:center;z-index:1001;animation:fadeIn .2s ease}.confirmation-bottom-sheet{background:#fff;border-radius:20px 20px 0 0;padding:.75rem 1.25rem 1.5rem;padding-bottom:calc(1.5rem + env(safe-area-inset-bottom,0px));width:100%;text-align:center;display:flex;flex-direction:column;max-width:100vw;box-sizing:border-box;will-change:transform}.confirmation-sheet-wrapper{overflow-y:auto;touch-action:pan-y;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}.confirmation-sheet-handle{width:36px;height:4px;background:#d1d5db;border-radius:2px;margin:0 auto 1rem;cursor:grab;position:relative;touch-action:none}.confirmation-sheet-handle:before{content:"";position:absolute;inset:-12px}.confirmation-sheet-handle:active{cursor:grabbing}.confirmation-modal{background:#fff;border-radius:16px;padding:2rem;max-width:420px;width:90%;text-align:center;box-shadow:0 20px 60px #0000004d;animation:confirmSlideUp .2s ease}@media(min-width:600px){.confirmation-modal.desktop-only{display:block!important}}@keyframes confirmSlideUp{0%{opacity:0;transform:translateY(20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}.confirmation-icon{font-size:3rem;margin-bottom:1rem;flex-shrink:0}.confirmation-title{margin:0 0 1rem;color:#2c3e50;font-size:1.5rem;font-weight:600;word-wrap:break-word;overflow-wrap:break-word;-webkit-hyphens:auto;hyphens:auto;flex-shrink:0}@media(max-width:599px){.confirmation-title{font-size:1.25rem}.confirmation-message{font-size:.95rem}}.confirmation-message{margin:0 0 1.5rem;color:#6c757d;font-size:1rem;line-height:1.5;word-wrap:break-word;overflow-wrap:break-word;word-break:break-word;-webkit-hyphens:auto;hyphens:auto;flex-shrink:0}.confirmation-actions{display:flex;flex-direction:column;gap:.5rem;flex-shrink:0}.confirmation-actions .btn{width:100%;padding:1rem;font-size:1rem;font-weight:600;border-radius:12px;cursor:pointer;transition:all .2s ease;border:none}.confirmation-actions .btn-secondary{background:#f1f3f4;color:#495057}.confirmation-actions .btn-secondary:hover{background:#e2e6ea}.confirmation-actions .btn-secondary:active{background:#d1d5db}.confirmation-actions .btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.confirmation-actions .btn-primary:hover,.confirmation-actions .btn-primary:active{background:linear-gradient(135deg,#5568d3,#6a3f8f)}.confirmation-actions .btn-danger{background:linear-gradient(135deg,#e74c3c,#c0392b);color:#fff}.confirmation-actions .btn-danger:hover,.confirmation-actions .btn-danger:active{background:linear-gradient(135deg,#d62c1a,#a93226)}@media(min-width:600px){.confirmation-overlay{align-items:center}.confirmation-actions{flex-direction:row;justify-content:center}.confirmation-actions .btn{flex:1;max-width:140px}}.course-create-fab{position:fixed;bottom:calc(12px + env(safe-area-inset-bottom,0px));right:calc(12px + env(safe-area-inset-right,0px));width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,#00d4ff,#09f);border:none;color:#fff;cursor:pointer;box-shadow:0 8px 24px #0099ff80,0 4px 12px #0006;transition:all .3s cubic-bezier(.4,0,.2,1);z-index:100;display:flex;align-items:center;justify-content:center}.course-create-fab svg{stroke-width:2.5}.course-create-fab:hover{transform:translateY(-2px) scale(1.05);box-shadow:0 12px 32px #00d4ff99,0 6px 16px #00000080;background:linear-gradient(135deg,#1ae5ff,#00b3ff)}.course-create-fab:active{transform:translateY(0) scale(.98);box-shadow:0 6px 16px #0099ff80,0 3px 8px #0006}@media(max-width:600px){.course-create-fab{bottom:calc(8px + env(safe-area-inset-bottom,0px));right:calc(8px + env(safe-area-inset-right,0px));width:56px;height:56px}.course-create-fab svg{width:24px;height:24px}}.courses-page{max-width:1200px;margin:0 auto;padding:.375rem}.courses-header{display:flex;flex-direction:column;gap:.375rem;margin-bottom:.75rem}.mobile-header{display:flex;justify-content:space-between;align-items:center}.mobile-header-top{display:none}.mobile-header-branding{display:flex;align-items:center;gap:.5rem}.logo-image-mobile{width:42px;height:42px;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3));animation:woodie-wiggle 3s ease-in-out infinite}.mobile-header-branding h1{font-size:1.0625rem;color:#fff;margin:0;font-weight:700;text-shadow:0 2px 4px rgba(0,0,0,.2)}.mobile-header-actions-top,.mobile-header-bottom,.mobile-header-actions-bottom{display:none}.mobile-menu-btn{width:44px;height:44px;border-radius:8px;background:#ffffff1f;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s ease}.mobile-menu-btn:hover,.mobile-menu-btn:active{background:#ffffff2e;transform:scale(1.05)}.mobile-menu-backdrop{position:fixed;inset:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:999;animation:fadeIn .2s ease}.mobile-menu{position:fixed;left:0;right:0;bottom:0;width:100%;background:#fff;border-radius:20px 20px 0 0;padding:.75rem 1.25rem 1.5rem;padding-bottom:calc(1.5rem + env(safe-area-inset-bottom,0px));z-index:1000;display:flex;flex-direction:column;will-change:transform}.mobile-menu-handle{width:36px;height:4px;background:#d1d5db;border-radius:2px;margin:0 auto 1rem;cursor:grab;position:relative;touch-action:none}.mobile-menu-handle:before{content:"";position:absolute;inset:-12px}.mobile-menu-handle:active{cursor:grabbing}.mobile-menu-content{display:block;width:100%;overflow-y:auto;touch-action:pan-y;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}.mobile-menu-content>button{display:block;margin-bottom:.5rem}.mobile-menu-content>button:last-child{margin-bottom:0}.mobile-menu-item{width:100%;padding:1rem;border:none;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s;background:#f1f3f4;color:#2c3e50;text-align:center}.mobile-menu-item:hover{background:#e5e7eb}.mobile-menu-item:active{background:#d1d5db}.form-backdrop{position:fixed;inset:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:999}.form-bottom-sheet{position:fixed;left:0;right:0;bottom:0;width:100%;background:#fff;border-radius:20px 20px 0 0;padding:.75rem 1.25rem 1.5rem;padding-bottom:calc(1.5rem + env(safe-area-inset-bottom,0px));z-index:1000;max-height:90vh;display:flex;flex-direction:column;will-change:transform}.form-sheet-handle{width:36px;height:4px;background:#d1d5db;border-radius:2px;margin:0 auto 1rem;flex-shrink:0;cursor:grab;position:relative;touch-action:none}.form-sheet-handle:before{content:"";position:absolute;inset:-12px}.form-sheet-handle:active{cursor:grabbing}.form-sheet-content-wrapper{overflow-y:auto;flex:1;touch-action:pan-y;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}.form-bottom-sheet .course-form{box-shadow:none;padding:0;max-width:none}.mobile-icon-btn{width:42px;height:42px;min-width:42px;min-height:42px;border-radius:50%;background:#ffffff1f;border:none;color:#fffc;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.0625rem;transition:all .2s ease}.mobile-icon-btn:hover,.mobile-icon-btn:active{background:#ffffff2e;color:#fff;transform:scale(1.05)}.mobile-icon-btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:1.75rem;font-weight:300;line-height:1}.mobile-icon-btn-primary:hover,.mobile-icon-btn-primary:active{background:linear-gradient(135deg,#7c8efc,#8b5bb8);transform:scale(1.05)}.desktop-header{display:none}.header-actions{display:flex;flex-direction:column;gap:.5rem;width:100%}.btn-profile,.btn-about,.btn-leaderboard{background:#ffffff1a;border:2px solid rgba(255,255,255,.2);color:#fff;padding:10px 16px;border-radius:12px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;gap:8px;width:100%}.btn-profile:hover,.btn-about:hover,.btn-leaderboard:hover{background:#fff3;border-color:#ffffff4d}.header-logo{display:flex;flex-direction:column;align-items:center;gap:.75rem;text-align:center}.logo-image{width:70px;height:70px;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3));animation:woodie-wiggle 3s ease-in-out infinite}@keyframes woodie-wiggle{0%,to{transform:rotate(0)}25%{transform:rotate(-3deg) translateY(-5px)}75%{transform:rotate(3deg) translateY(-5px)}}.header-text{display:flex;flex-direction:column;align-items:center;text-align:center}.courses-header h1{font-size:1.75rem;color:#fff;margin-bottom:.25rem;font-weight:700;text-shadow:0 2px 4px rgba(0,0,0,.2)}.subtitle{color:#ffffffe6;font-size:.9rem}.courses-container{display:flex;flex-direction:column;gap:.75rem}.welcome-section{display:flex;justify-content:center;padding:.5rem 0}.welcome-content{background:#fffffff2;border-radius:14px;padding:1.25rem 1rem;text-align:center;max-width:400px;width:100%;box-shadow:0 8px 32px #00000026;border:1px solid rgba(255,255,255,.2)}.welcome-content h2{margin:0 0 .25rem;color:#2c3e50;font-size:1.25rem;font-weight:700}.welcome-subtitle{color:#6c757d;font-size:.875rem;margin:0 0 1rem}.welcome-content .btn-get-started{background:linear-gradient(135deg,gold,#ffb300);border:none;color:#1a1a1a;padding:1rem 2rem;border-radius:12px;font-size:1.1rem;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 16px #ffc10766;width:100%;display:flex;align-items:center;justify-content:center;gap:.5rem}.welcome-content .btn-get-started:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 24px #ffc10780}.welcome-content .btn-get-started:disabled{opacity:.7;cursor:not-allowed;transform:none}.spinner-small{width:18px;height:18px;border:2px solid rgba(26,26,26,.2);border-top-color:#1a1a1a;border-radius:50%;animation:spin 1s linear infinite}.quick-start-description{color:#6c757d;font-size:.9rem;margin:1rem 0 1.25rem;line-height:1.5}.welcome-divider{display:flex;align-items:center;margin:1rem 0}.welcome-divider:before,.welcome-divider:after{content:"";flex:1;height:1px;background:#e0e0e0}.welcome-divider span{padding:0 1rem;color:#999;font-size:.85rem;font-weight:500;text-transform:uppercase;letter-spacing:.5px}.btn-create-custom{width:100%;padding:.875rem 1.5rem;font-size:.95rem}.create-course-section{display:flex;justify-content:center}.btn-large{padding:1rem 2rem;font-size:1rem;width:100%}.course-form{background:#fff;padding:.875rem;border-radius:14px;box-shadow:0 8px 24px #00000026;width:100%;max-width:600px}.course-form h2{margin-top:0;margin-bottom:.875rem;color:#2c3e50;font-size:1.25rem}.course-limit-warning{background:linear-gradient(135deg,#fff3cd,#ffeeba);border:1px solid #ffc107;border-radius:12px;padding:1rem 1.25rem;margin-bottom:1.5rem;display:flex;align-items:flex-start;gap:.75rem}.course-limit-warning .warning-icon{font-size:1.25rem;flex-shrink:0;margin-top:.1rem}.course-limit-warning p{margin:0;color:#856404;font-size:.95rem;line-height:1.5}.form-group{margin-bottom:2rem}.form-group label{display:block;margin-bottom:.75rem;color:#2c3e50;font-weight:600;font-size:1rem}.form-input{width:100%;padding:.875rem 1.25rem;border:2px solid #e0e0e0;border-radius:8px;font-size:1rem;transition:border-color .3s;font-family:inherit}.form-input:focus{outline:none;border-color:#667eea}.session-duration-input{max-width:150px}.difficulty-buttons{display:flex;gap:.75rem;flex-wrap:wrap}.repetitions-input{display:flex;align-items:center;gap:1.5rem}.range-input{flex:1;height:8px;border-radius:4px;background:#e0e0e0;outline:none;appearance:none;-webkit-appearance:none}.range-input::-webkit-slider-thumb{-webkit-appearance:none;width:24px;height:24px;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);cursor:pointer;box-shadow:0 2px 6px #0003}.range-input::-moz-range-thumb{width:24px;height:24px;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);cursor:pointer;border:none;box-shadow:0 2px 6px #0003}.repetitions-value{min-width:3rem;text-align:center;font-size:1.5rem;font-weight:700;color:#667eea}.puzzle-slider-row{display:flex;align-items:center;gap:1rem}.puzzle-value{min-width:3rem;text-align:center;font-size:1.25rem;font-weight:700;color:#667eea}.help-text{margin-top:.5rem;font-size:.9rem;color:#6c757d;font-style:italic}.form-actions{display:flex;gap:1rem;margin-top:2rem}.form-actions .btn{flex:1}.courses-list h2{color:#fff;font-size:1.4rem;margin-bottom:1rem;text-align:center}.courses-grid{display:grid;grid-template-columns:1fr;gap:.5rem}.course-card{background:#fff;border-radius:10px;padding:1rem;box-shadow:0 4px 12px #0000001a;transition:transform .3s,box-shadow .3s;position:relative;overflow:hidden;border:2px solid transparent}.course-card:before{content:"";position:absolute;top:0;left:0;right:0;height:6px;background:linear-gradient(90deg,#667eea,#764ba2);z-index:1}.course-card-master .prestige-badge{position:absolute;top:-8px;left:50%;transform:translate(-50%);background:linear-gradient(135deg,gold,#ffed4e,gold);color:#880e4f;padding:.4rem 1.2rem;border-radius:20px;font-size:.7rem;font-weight:800;letter-spacing:1.2px;z-index:10;box-shadow:0 4px 12px #ffd70099,inset 0 1px #ffffff80;border:2px solid #ffed4e;animation:masterBadgePulse 2s ease-in-out infinite}@keyframes masterBadgePulse{0%,to{transform:translate(-50%) scale(1);box-shadow:0 4px 12px #ffd70099,inset 0 1px #ffffff80}50%{transform:translate(-50%) scale(1.05);box-shadow:0 6px 18px #ffd700cc,inset 0 1px #fff9}}.course-card-expert .prestige-badge{position:absolute;top:-8px;left:50%;transform:translate(-50%);background:linear-gradient(135deg,#4dd0e1,#00bcd4,#0097a7);color:#01579b;padding:.4rem 1.2rem;border-radius:20px;font-size:.7rem;font-weight:800;letter-spacing:1.2px;z-index:10;box-shadow:0 4px 12px #00bcd480,inset 0 1px #fff6;border:2px solid #4dd0e1;animation:expertBadgePulse 2s ease-in-out infinite}@keyframes expertBadgePulse{0%,to{transform:translate(-50%) scale(1);box-shadow:0 4px 12px #00bcd480,inset 0 1px #fff6}50%{transform:translate(-50%) scale(1.05);box-shadow:0 6px 16px #00bcd4b3,inset 0 1px #ffffff80}}.course-card-advanced .reward-badge{position:absolute;top:-6px;left:50%;transform:translate(-50%);background:linear-gradient(135deg,#ab47bc,#9c27b0);color:#fff;padding:.3rem 1rem;border-radius:16px;font-size:.65rem;font-weight:700;letter-spacing:1px;z-index:10;box-shadow:0 3px 8px #9c27b066,inset 0 1px #ffffff4d;border:1px solid #ce93d8;animation:advancedBadgeGlow 2.5s ease-in-out infinite}@keyframes advancedBadgeGlow{0%,to{box-shadow:0 3px 8px #9c27b066,inset 0 1px #ffffff4d}50%{box-shadow:0 3px 10px #9c27b099,inset 0 1px #fff6}}.course-card-intermediate .reward-badge{position:absolute;top:-6px;left:50%;transform:translate(-50%);background:linear-gradient(135deg,#ffb74d,#ffa726);color:#fff;padding:.3rem 1rem;border-radius:16px;font-size:.65rem;font-weight:700;letter-spacing:1px;z-index:10;box-shadow:0 3px 8px #ff980066,inset 0 1px #fff6;border:1px solid #ffcc80}.incomplete-badge{position:absolute;top:-8px;left:50%;transform:translate(-50%);background:linear-gradient(135deg,#4caf50,#45a049);color:#fff;padding:.4rem 1.2rem;border-radius:20px;font-size:.7rem;font-weight:800;letter-spacing:1.2px;z-index:10;box-shadow:0 4px 12px #4caf5080,inset 0 1px #ffffff4d;border:2px solid #66bb6a;animation:pausePulse 1.5s ease-in-out infinite}@keyframes pausePulse{0%,to{transform:translate(-50%) scale(1);opacity:1}50%{transform:translate(-50%) scale(1.05);opacity:.9}}.course-card.has-incomplete-session{border:2px solid #4caf50;box-shadow:0 4px 16px #4caf504d}.course-card-beginner,.course-card-novice{background:linear-gradient(135deg,#f1f8e9,#fff);border-color:#8bc34a66;box-shadow:0 2px 8px #8bc34a26}.course-card-beginner:before,.course-card-novice:before{background:linear-gradient(90deg,#aed581,#9ccc65);height:4px}.course-card-beginner:after,.course-card-novice:after{content:"";position:absolute;width:400px;height:400px;right:-80px;bottom:-80px;background-image:url(/chess-pawn.svg);background-size:contain;background-repeat:no-repeat;background-position:center;opacity:.08;transform:rotate(-5deg);z-index:0;filter:brightness(1.3) sepia(.2) hue-rotate(60deg) saturate(.6)}.course-card-beginner:hover,.course-card-novice:hover{box-shadow:0 6px 16px #8bc34a40;border-color:#8bc34a99;transform:translateY(-2px)}.course-card-beginner .progress-fill,.course-card-novice .progress-fill{background:linear-gradient(90deg,#aed581,#9ccc65)}.course-card-beginner .progress-percentage,.course-card-novice .progress-percentage{color:#7cb342;font-weight:600}.course-card-beginner h3,.course-card-novice h3{color:#558b2f}.course-card-intermediate{background:linear-gradient(135deg,#fff3e0,#fffaf0,#fff);border-color:#ff980080;box-shadow:0 4px 12px #ff980033,0 0 0 1px #ffc1071a inset}.course-card-intermediate:before{background:linear-gradient(90deg,#ff9800,#f57c00);height:5px;animation:intermediateGlow 2s ease-in-out infinite alternate}@keyframes intermediateGlow{0%{box-shadow:0 0 5px #ff98004d}to{box-shadow:0 0 10px #ffc10799}}.course-card-intermediate:after{content:"";position:absolute;width:400px;height:400px;right:-70px;bottom:-70px;background-image:url(/chess-knight.svg);background-size:contain;background-repeat:no-repeat;background-position:center;opacity:.12;transform:rotate(-10deg);z-index:0;filter:brightness(1) sepia(.5) hue-rotate(10deg) saturate(1.4)}.course-card-intermediate:hover{box-shadow:0 8px 24px #ff980066;border-color:#ff9800b3;transform:translateY(-3px)}.course-card-intermediate .progress-fill{background:linear-gradient(90deg,#ff9800,#f57c00);box-shadow:0 1px 3px #f57c004d}.course-card-intermediate .progress-percentage{color:#e65100;font-weight:700;font-size:1rem}.course-card-intermediate h3{color:#e65100;font-weight:700}.course-card-advanced{background:linear-gradient(135deg,#e8eaf6,#f3e5f5 40%,#fff);border-color:#673ab780;box-shadow:0 5px 16px #673ab740,0 0 0 1px #7e57c226 inset}.course-card-advanced:before{background:linear-gradient(90deg,#7e57c2,#673ab7,#5e35b1);height:5px;box-shadow:0 1px 4px #673ab766;animation:advancedPulse 2.5s ease-in-out infinite alternate}@keyframes advancedPulse{0%{box-shadow:0 1px 4px #673ab766}to{box-shadow:0 1px 8px #7e57c2b3}}.course-card-advanced:after{content:"";position:absolute;width:420px;height:420px;right:-75px;bottom:-75px;background-image:url(/chess-bishop.svg);background-size:contain;background-repeat:no-repeat;background-position:center;opacity:.15;transform:rotate(-8deg);z-index:0;filter:brightness(.95) sepia(.4) hue-rotate(230deg) saturate(1.6)}.course-card-advanced:hover{box-shadow:0 10px 28px #673ab766;border-color:#673ab7b3;transform:translateY(-3px)}.course-card-advanced .progress-fill{background:linear-gradient(90deg,#7e57c2,#673ab7,#5e35b1);box-shadow:0 1px 3px #673ab766}.course-card-advanced .progress-percentage{color:#4527a0;font-weight:700;font-size:1.05rem}.course-card-advanced h3{color:#4527a0;font-weight:700;letter-spacing:.3px}.course-card:hover{transform:translateY(-4px);box-shadow:0 8px 20px #00000026}.course-card-expert{background:linear-gradient(135deg,#e3f2fd,#e1f5fe 40%,#fff);border:2px solid;border-color:#0277bd99;box-shadow:0 6px 18px #0277bd4d,0 0 0 1px #039be533 inset}.course-card-expert:before{background:linear-gradient(90deg,#039be5,#0277bd,#01579b);height:5px;box-shadow:0 2px 6px #0277bd80,0 0 8px #039be54d;animation:expertShine 2s ease-in-out infinite alternate}@keyframes expertShine{0%{box-shadow:0 2px 6px #0277bd80,0 0 8px #039be54d}to{box-shadow:0 2px 6px #0277bdb3,0 0 12px #039be580}}.course-card-expert:after{content:"";position:absolute;width:430px;height:430px;right:-75px;bottom:-75px;background-image:url(/chess-rook.svg);background-size:contain;background-repeat:no-repeat;background-position:center;opacity:.18;transform:rotate(-6deg);z-index:0;filter:brightness(.92) sepia(.3) hue-rotate(170deg) saturate(1.8)}.course-card-expert:hover{box-shadow:0 12px 30px #0277bd73;border-color:#0277bdcc;transform:translateY(-4px)}.course-card-expert .progress-fill{background:linear-gradient(90deg,#039be5,#0277bd,#01579b);box-shadow:0 2px 4px #0277bd66}.course-card-expert .progress-percentage{color:#01579b;font-weight:800;font-size:1.05rem;text-shadow:0 1px 2px rgba(1,87,155,.15)}.course-card-expert h3{color:#01579b;font-weight:800;letter-spacing:.4px}.course-card-master{background:repeating-linear-gradient(45deg,transparent,transparent 10px,rgba(136,14,79,.02) 10px,rgba(136,14,79,.02) 20px),linear-gradient(135deg,#fce4ec,#f8bbd0 30%,#fffaf5);border:3px solid;border-color:#c2185bb3;box-shadow:0 8px 24px #c2185b59,inset 0 1px #fff9,0 0 0 1px #ffd70033 inset;animation:masterPrestige 3s ease-in-out infinite}@keyframes masterPrestige{0%,to{box-shadow:0 8px 24px #c2185b59,inset 0 1px #fff9,0 0 0 1px #ffd70033 inset}50%{box-shadow:0 8px 24px #c2185b80,inset 0 1px #ffffffb3,0 0 0 2px #ffd70059 inset,0 0 25px #ffd70040}}.course-card-master:before{background:linear-gradient(90deg,#d81b60,#ad1457,gold 40%,#ffeb3b,gold 60%,#ad1457,#880e4f);background-size:200% 100%;height:6px;box-shadow:0 2px 6px #880e4f80,0 0 12px #ffd70066;animation:masterStripe 3s linear infinite}@keyframes masterStripe{0%{background-position:0% 50%}to{background-position:200% 50%}}.course-card-master:after{content:"";position:absolute;width:450px;height:450px;right:-80px;bottom:-80px;background-image:url(/chess-queen.svg);background-size:contain;background-repeat:no-repeat;background-position:center;opacity:.22;transform:rotate(-12deg);z-index:0;filter:brightness(.9) sepia(.6) hue-rotate(310deg) saturate(1.9) contrast(1.15)}.course-card-master:hover{box-shadow:0 14px 36px #c2185b99,inset 0 1px #ffffffb3,0 0 0 2px #ffd70059 inset;border-color:#c2185be6;transform:translateY(-5px)}.course-card-master .progress-fill{background:linear-gradient(90deg,#d81b60,#c2185b,#ad1457 60%,#880e4f);box-shadow:0 2px 6px #880e4f80}.course-card-master .progress-percentage{color:#880e4f;font-weight:900;font-size:1.15rem;text-shadow:0 1px 3px rgba(136,14,79,.25)}.course-card-master h3{color:#880e4f;font-weight:900;letter-spacing:.5px;text-shadow:0 1px 3px rgba(136,14,79,.15)}.course-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:.875rem;position:relative;z-index:2}.course-title-row{display:flex;align-items:center;gap:.5rem;flex:1}.course-header-actions{display:flex;gap:.375rem;align-items:center;margin-left:.75rem;flex-shrink:0}.expand-btn{background:transparent;border:none;color:#0009;font-size:.875rem;cursor:pointer;padding:.375rem;display:flex;align-items:center;justify-content:center;transition:all .2s ease;border-radius:4px;min-width:32px;min-height:32px}.expand-btn:hover{background:#0000000d;color:#000c}.expand-btn:active{background:#0000001a}.completion-ribbon{position:absolute;top:20px;right:-5px;z-index:10;overflow:hidden}.ribbon-content{position:relative;background:linear-gradient(135deg,gold,#ffed4e,gold);color:#1a1a1a;padding:.5rem 2.5rem .5rem 1.5rem;font-size:.75rem;font-weight:800;letter-spacing:1px;box-shadow:0 4px 8px #0003,inset 0 1px #fff6;display:flex;align-items:center;gap:.4rem;text-shadow:0 1px 0 rgba(255,255,255,.5)}.ribbon-content:before{content:"";position:absolute;right:0;top:0;width:0;height:0;border-style:solid;border-width:0 15px 15px 0;border-color:transparent #c9a000 transparent transparent;transform:rotate(0)}.ribbon-content:after{content:"";position:absolute;right:0;bottom:0;width:0;height:0;border-style:solid;border-width:15px 15px 0 0;border-color:#c9a000 transparent transparent transparent}.ribbon-icon{font-size:1rem;filter:drop-shadow(0 1px 2px rgba(0,0,0,.3))}.ribbon-text{font-size:.7rem}.course-card.course-complete{position:relative;filter:saturate(.6) brightness(1.08);border-color:#4caf5080!important;background:linear-gradient(135deg,#f5faf5f2,#fffffff2)!important}.course-card.course-complete:before{background:linear-gradient(90deg,#4caf50,#45a049)!important;opacity:.9;height:5px!important}.course-card.course-complete:after{opacity:.15!important;filter:grayscale(.3)}.course-card.course-complete .progress-fill{background:linear-gradient(90deg,#4caf50,#45a049)!important}.course-card.course-complete .progress-percentage{color:#2e7d32!important;font-weight:700}.course-card.course-complete h3,.course-card.course-complete .detail-value,.course-card.course-complete .progress-text{opacity:.8;color:#555!important}.course-card.course-complete .ppm-section{opacity:.75}.course-card h3{margin:0;color:#2c3e50;font-size:1.4rem;position:relative;z-index:2}.delete-btn{background:none;border:none;color:#e74c3c;font-size:2rem;line-height:1;cursor:pointer;padding:0;width:32px;height:32px;border-radius:50%;transition:background-color .2s}.delete-btn:hover{background-color:#e74c3c1a}.course-details{display:none;flex-direction:column;gap:.75rem;margin-bottom:0;position:relative;z-index:2;overflow:hidden;max-height:0;opacity:0;transition:max-height .3s ease,opacity .3s ease,margin-bottom .3s ease}.course-details.expanded{display:flex;max-height:500px;opacity:1;margin-bottom:1.25rem}.detail-item{display:flex;justify-content:space-between;align-items:center}.detail-label{color:#6c757d;font-weight:500;font-size:.9rem}.detail-value{color:#2c3e50;font-weight:600;text-transform:capitalize}.difficulty-value{font-weight:700;letter-spacing:.5px;text-transform:uppercase;font-size:.95rem}.course-details{position:relative}.completed-stamp{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) rotate(-20deg);font-size:1.4rem;font-weight:900;letter-spacing:3px;color:#228b22b3;border:4px solid rgba(34,139,34,.7);border-radius:8px;padding:.3rem 1rem;text-transform:uppercase;pointer-events:none;white-space:nowrap}.course-card-novice .difficulty-value,.course-card-beginner .difficulty-value{color:#558b2f;font-weight:600}.course-card-intermediate .difficulty-value{color:#e65100;font-weight:700;letter-spacing:.5px}.course-card-advanced .difficulty-value{color:#4527a0;font-weight:700;letter-spacing:.6px}.course-card-expert .difficulty-value{color:#01579b;font-weight:800;letter-spacing:.7px;text-shadow:0 1px 2px rgba(1,87,155,.12)}.course-card-master .difficulty-value{color:#880e4f;font-weight:900;letter-spacing:1px;text-shadow:0 1px 2px rgba(136,14,79,.18)}.progress-section{margin-bottom:1.25rem;position:relative;z-index:2}.progress-info{display:flex;justify-content:space-between;align-items:center;margin-bottom:.5rem;font-size:.85rem}.progress-text{color:#6c757d;font-weight:500}.progress-percentage{color:#667eea;font-weight:700;font-size:.95rem}.progress-bar{height:10px;background:#e0e0e0;border-radius:5px;overflow:hidden;box-shadow:inset 0 1px 3px #0000001a}.progress-fill{height:100%;background:linear-gradient(90deg,#667eea,#764ba2);transition:width .3s ease;border-radius:5px;position:relative;overflow:hidden}.ppm-section{display:flex;align-items:center;gap:1rem;padding:1.25rem;margin-bottom:1rem;border-radius:12px;background:linear-gradient(135deg,#667eea99,#764ba299);border:2px solid rgba(102,126,234,.8);transition:all .3s ease;position:relative;overflow:hidden;box-shadow:0 4px 12px #00000040;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.ppm-section:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left .5s ease}.ppm-section:hover:before{left:100%}.ppm-icon{font-size:2.5rem;filter:drop-shadow(0 2px 4px rgba(0,0,0,.2));animation:ppm-pulse 2s ease-in-out infinite}@keyframes ppm-pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.ppm-content{flex:1;display:flex;flex-direction:column;gap:.25rem}.ppm-value{font-size:1.5rem;font-weight:700;color:#1a1a1a;line-height:1;text-shadow:0 1px 2px rgba(255,255,255,.3)}.ppm-unit{font-size:.75rem;font-weight:500;color:#4a4a4a;margin-left:.25rem}.ppm-message{font-size:.9rem;font-weight:600;color:#667eea;text-transform:uppercase;letter-spacing:.5px}.ppm-fire{background:linear-gradient(135deg,#ff4757a6,#ff6b6ba6);border-color:#ff4757e6;box-shadow:0 4px 16px #ff475766}.ppm-fire .ppm-value{color:#b71c1c}.ppm-fire .ppm-message{color:#ff4757}.ppm-fire .ppm-icon svg{color:#ff4757}.ppm-lightning{background:linear-gradient(135deg,#ffc300a6,#ffd60aa6);border-color:#ffc300e6;box-shadow:0 4px 16px #ffc30066}.ppm-lightning .ppm-value{color:#b38600}.ppm-lightning .ppm-message{color:#ff8c00}.ppm-lightning .ppm-icon svg{color:#ffc300}.ppm-rocket{background:linear-gradient(135deg,#58b19fa6,#2ed573a6);border-color:#58b19fe6;box-shadow:0 4px 16px #58b19f66}.ppm-rocket .ppm-value{color:#00695c}.ppm-rocket .ppm-message{color:#00c853}.ppm-rocket .ppm-icon svg{color:#58b19f}.ppm-strong{background:linear-gradient(135deg,#4a90e2a6,#667eeaa6);border-color:#4a90e2e6;box-shadow:0 4px 16px #4a90e266}.ppm-strong .ppm-value{color:#1565c0}.ppm-strong .ppm-message{color:#4a90e2}.ppm-strong .ppm-icon svg{color:#4a90e2}.ppm-improving{background:linear-gradient(135deg,#9575cda6,#a88bdba6);border-color:#9575cde6;box-shadow:0 4px 16px #9575cd66}.ppm-improving .ppm-value{color:#4a148c}.ppm-improving .ppm-message{color:#9575cd}.ppm-improving .ppm-icon svg{color:#9575cd}.ppm-growing{background:linear-gradient(135deg,#81c784a6,#9ccc65a6);border-color:#81c784e6;box-shadow:0 4px 16px #81c78466}.ppm-growing .ppm-value{color:#1b5e20}.ppm-growing .ppm-message{color:#4caf50}.ppm-growing .ppm-icon svg{color:#81c784}.progress-fill:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,#fff0,#fff3,#fff0);animation:shimmer 2s infinite}@keyframes shimmer{0%{transform:translate(-100%)}to{transform:translate(100%)}}.course-actions{display:flex;gap:.75rem;flex-direction:column;position:relative;z-index:2}.btn-start{flex:1}.btn-results-complete{flex:1;background:linear-gradient(135deg,#4caf50,#45a049);font-size:1.05rem;font-weight:600;box-shadow:0 4px 12px #4caf504d}.btn-results-complete:hover{background:linear-gradient(135deg,#45a049,#388e3c);box-shadow:0 6px 16px #4caf5066;transform:translateY(-2px)}.btn-results{font-size:.9rem;padding:.6rem 1rem}.modal-overlay{position:fixed;inset:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:flex-end;justify-content:center;z-index:1000;animation:fadeIn .2s ease}@media(min-width:600px){.modal-overlay{align-items:center}}.modal-content{background:#fff;border-radius:16px;padding:2rem;box-shadow:0 20px 60px #0000004d;max-width:600px;width:90%}.results-bottom-sheet{position:fixed;left:0;right:0;bottom:0;width:100%;background:#fff;border-radius:20px 20px 0 0;z-index:1000;max-height:90vh;display:flex;flex-direction:column;will-change:transform}.results-sheet-handle{width:36px;height:4px;background:#d1d5db;border-radius:2px;margin:1rem auto 0;flex-shrink:0;cursor:grab;position:relative;touch-action:none}.results-sheet-handle:before{content:"";position:absolute;inset:-12px}.results-sheet-handle:active{cursor:grabbing}.results-sheet-content{padding:0 1.5rem 1.5rem;padding-bottom:calc(1.5rem + env(safe-area-inset-bottom,0px));display:flex;flex-direction:column;gap:1.5rem;overflow-y:auto;touch-action:pan-y;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}.results-sheet-header{text-align:center;padding:1rem 0 .75rem}.results-sheet-header h2{font-size:1.25rem;font-weight:600;color:#1f2937;margin:0}.results-hero{display:flex;justify-content:center}.hero-ppm-card{background:linear-gradient(135deg,#667eea,#764ba2);border-radius:16px;padding:2rem 2.5rem;text-align:center;color:#fff;box-shadow:0 8px 24px #667eea4d;width:100%;max-width:300px}.hero-ppm-value{font-size:3.5rem;font-weight:700;line-height:1;margin-bottom:.5rem}.hero-ppm-label{font-size:1rem;opacity:.95;font-weight:500;margin-bottom:.25rem}.hero-ppm-subtitle{font-size:.875rem;opacity:.8;text-transform:uppercase;letter-spacing:.5px;font-weight:600}.results-supporting-stats{background:#f9fafb;border-radius:12px;padding:1rem 1.25rem;display:flex;flex-direction:column;gap:.75rem}.stat-row{display:flex;justify-content:space-between;align-items:center}.stat-label{color:#6b7280;font-size:.95rem;font-weight:500}.stat-value{color:#1f2937;font-size:1rem;font-weight:600}.results-cycles{border-top:1px solid #e5e7eb;padding-top:1rem}.cycles-header{display:flex;align-items:center;gap:.5rem;padding:.75rem 0;cursor:pointer;-webkit-user-select:none;user-select:none;color:#4b5563;font-weight:600;font-size:.95rem}.cycles-header:active{opacity:.7}.cycles-header .expand-icon{font-size:.75rem;color:#9ca3af}.cycle-summary{background:#f9fafb;border-radius:8px;padding:.875rem 1rem;margin-top:.75rem}.cycle-summary .cycle-title{font-weight:600;color:#374151;font-size:.9rem;margin-bottom:.625rem}.cycle-stats-row{display:flex;justify-content:space-between;gap:.75rem}.cycle-stat{display:flex;flex-direction:column;align-items:center;flex:1}.cycle-stat-label{font-size:.75rem;color:#9ca3af;margin-bottom:.25rem;text-transform:uppercase;letter-spacing:.3px}.cycle-stat-value{font-size:1rem;font-weight:600;color:#1f2937}.results-actions{margin-top:.5rem}.btn-full-width{width:100%;padding:.875rem;font-size:1rem;font-weight:600;border-radius:12px}.results-bottom-sheet .results-content{flex:1;overflow-y:auto;margin-bottom:1rem}.results-bottom-sheet .btn{width:100%}.modal-content.results-modal{max-width:1200px!important;width:98%!important;max-height:92vh;overflow-y:auto;padding:1.5rem;animation:fadeIn .3s ease}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem;padding-bottom:.75rem;border-bottom:2px solid #e0e0e0}.modal-header h2{margin:0;color:#2c3e50;font-size:1.5rem}.close-btn{background:none;border:none;font-size:2rem;color:#6c757d;cursor:pointer;padding:0;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:background-color .2s,color .2s}.close-btn:hover{background-color:#f0f0f0;color:#2c3e50}.results-content{margin-bottom:1rem}.no-stats{text-align:center;color:#6c757d;font-size:1.1rem;padding:3rem 1rem}.set-section{margin-bottom:1.5rem;border:1px solid #e0e0e0;border-radius:10px;overflow:hidden}.set-header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:1rem 1.25rem;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem;transition:background .2s ease}.set-header.clickable:hover{background:linear-gradient(135deg,#5568d3,#653a8b)}.cycle-title h4{margin:0;font-size:1.2rem;font-weight:700;display:flex;align-items:center;gap:.5rem}.expand-icon{font-size:.8rem;transition:transform .2s ease;display:inline-block}.cycle-metrics{display:flex;gap:2rem;align-items:center;flex-wrap:wrap}.metric-highlight{display:flex;align-items:center;gap:.6rem;background:#ffffff26;padding:.6rem 1rem;border-radius:10px;border:1px solid rgba(255,255,255,.2)}.metric-icon{font-size:1.5rem}.metric-data{display:flex;flex-direction:column;gap:.15rem}.metric-label{font-size:.7rem;opacity:.9;text-transform:uppercase;letter-spacing:.4px}.metric-value{font-size:1.3rem;font-weight:700;line-height:1}.metric-secondary{display:flex;gap:1.5rem;font-size:.95rem;opacity:.95}.metric-secondary .success-rate{font-weight:700;background:#4caf504d;padding:.3rem .7rem;border-radius:6px;border:1px solid rgba(76,175,80,.4)}.set-header h3{margin:0;font-size:1.3rem}.set-summary{display:flex;gap:1.5rem;font-size:.95rem}.set-summary .success-rate{font-weight:700;background:#fff3;padding:.3rem .7rem;border-radius:6px}.overall-summary{margin-bottom:1.5rem;padding:1.25rem;background:linear-gradient(135deg,#f8f9fa,#fff);border-radius:12px;border:2px solid #e9ecef}.overall-summary h3{margin:0 0 1rem;color:#2c3e50;font-size:1.25rem;text-align:center;font-weight:700}.summary-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:1rem}@media(max-width:1200px){.summary-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:768px){.summary-grid{grid-template-columns:repeat(2,1fr);gap:1rem}}@media(max-width:480px){.summary-grid{grid-template-columns:1fr}}.summary-card{background:#fff;border-radius:10px;padding:1rem;display:flex;align-items:center;gap:.75rem;box-shadow:0 2px 6px #00000014;border:1px solid #e9ecef;transition:all .3s}.summary-card.highlight{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;box-shadow:0 4px 12px #667eea4d}.summary-card:hover{transform:translateY(-3px);box-shadow:0 6px 16px #0000001f}.summary-card.highlight:hover{box-shadow:0 6px 20px #667eea66}.summary-icon{font-size:2rem;opacity:.9}.summary-content{flex:1}.summary-label{font-size:.75rem;opacity:.8;margin-bottom:.15rem;font-weight:500}.summary-card.highlight .summary-label{color:#ffffffe6}.summary-value{font-size:1.6rem;font-weight:700;line-height:1;margin-bottom:.15rem}.summary-subtext{font-size:.7rem;opacity:.7;margin-top:.15rem}.summary-card.highlight .summary-subtext{color:#fffc}.cycles-breakdown{margin-top:1rem}.cycles-breakdown h3{margin:0 0 1rem;color:#2c3e50;font-size:1.2rem;font-weight:700;padding-left:.5rem;border-left:4px solid #667eea}.stats-table{width:100%;border-collapse:collapse}.stats-table thead{background:#f8f9fa}.stats-table th{padding:.7rem .875rem;text-align:left;font-weight:600;color:#2c3e50;border-bottom:2px solid #e0e0e0;font-size:.85rem}.stats-table td{padding:.65rem .875rem;border-bottom:1px solid #e0e0e0;color:#495057;font-size:.9rem}.ppm-value{font-weight:600;color:#667eea}.stats-table tbody tr:hover{background-color:#f8f9fa}.stats-table tbody tr:last-child td{border-bottom:none}.success-good{color:#28a745;font-weight:700}.success-ok{color:#ffc107;font-weight:700}.success-poor{color:#dc3545;font-weight:700}.trial-badge{position:absolute;top:-6px;left:50%;transform:translate(-50%);background:linear-gradient(135deg,#78909c,#607d8b);color:#fff;padding:.3rem 1rem;border-radius:16px;font-size:.65rem;font-weight:700;letter-spacing:1px;z-index:10;box-shadow:0 2px 6px #607d8b66;border:1px solid #90a4ae;text-transform:uppercase}@media(min-width:600px){.courses-page{padding:1.25rem}.mobile-header{display:none}.course-details{display:flex!important;max-height:none!important;opacity:1!important;margin-bottom:1.25rem!important}.courses-header{flex-direction:row;justify-content:space-between;align-items:center;margin-bottom:2rem}.header-actions{flex-direction:row;width:auto;gap:.75rem}.btn-profile,.btn-about,.btn-leaderboard{width:auto;padding:12px 24px;font-size:1rem}.header-logo{flex-direction:row;gap:1rem;text-align:left}.header-text{align-items:flex-start;text-align:left}.logo-image{width:90px;height:90px}.courses-header h1{font-size:2.25rem}.subtitle{font-size:1rem}.courses-container{gap:2rem}.btn-large{width:auto;padding:1.25rem 3rem;font-size:1.1rem}.welcome-content{padding:2.5rem 2rem;max-width:450px}.welcome-content h2{font-size:1.75rem}.welcome-content .btn-get-started{padding:1.125rem 2.5rem;font-size:1.15rem}.course-form{padding:2rem}.course-form h2{font-size:1.6rem;margin-bottom:1.5rem}.courses-list h2{font-size:1.75rem;margin-bottom:1.25rem}.courses-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.25rem}}@media(min-width:900px){.courses-page{padding:2rem}.courses-header{margin-bottom:3rem}.header-logo{gap:1.5rem}.logo-image{width:120px;height:120px}.courses-header h1{font-size:3rem;margin-bottom:.5rem}.subtitle{font-size:1.1rem}.courses-container{gap:3rem}.btn-large{padding:1.25rem 3rem;font-size:1.2rem}.course-form{padding:2.5rem}.course-form h2{font-size:1.8rem;margin-bottom:2rem}.courses-list h2{font-size:2rem;margin-bottom:1.5rem}.courses-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1.5rem}.btn-profile:hover,.btn-about:hover,.btn-leaderboard:hover{transform:translateY(-2px);box-shadow:0 4px 12px #fff3}.welcome-content{padding:3rem 2.5rem;max-width:480px}.welcome-content h2{font-size:2rem}.welcome-subtitle{font-size:1.1rem}.welcome-content .btn-get-started{padding:1.25rem 3rem;font-size:1.2rem}.quick-start-description{font-size:.95rem}}.courses-loading,.courses-error{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem 1rem;gap:1rem;background:#ffffff1a;border-radius:16px;margin-top:1rem}.courses-loading .spinner{width:40px;height:40px;border:3px solid rgba(255,255,255,.2);border-top-color:#fff;border-radius:50%;animation:spin 1s linear infinite}.courses-loading p,.courses-error p{color:#ffffffe6;font-size:1rem;margin:0}.courses-error{background:#dc354533;border:1px solid rgba(220,53,69,.4)}.courses-error p{color:#ff6b6b}.puzzle-container{max-width:1400px;margin:0 auto;padding:0 0 80px;min-height:100vh;min-height:100dvh}.mobile-top-widget{margin:.5rem .5rem 1rem;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:16px;padding:.75rem 1rem .5rem;box-shadow:0 4px 20px #667eea4d}.mobile-header-row{display:flex;align-items:center;justify-content:space-between}.mobile-header-row .timer-section{background:none;padding:0}.btn-pause-mobile{width:48px;height:48px;min-width:48px;min-height:48px;border-radius:50%;background:#ffffff26;border:2px solid rgba(255,255,255,.2);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s}.btn-pause-mobile svg{width:28px;height:28px}.btn-pause-mobile:hover,.btn-pause-mobile:active{background:#ffffff40;border-color:#fff6;transform:scale(1.05)}.mobile-progress-section{margin-top:.75rem}.mobile-progress-bar{height:4px;background:#fff3;border-radius:2px;overflow:hidden}.mobile-progress-fill{height:100%;background:linear-gradient(90deg,#4ade80,#22c55e);border-radius:2px;transition:width .3s ease}.mobile-progress-text{display:block;text-align:center;font-size:.7rem;color:#fffc;margin-top:.35rem;font-weight:500;letter-spacing:.02em}.mobile-action-bar{position:fixed;bottom:0;left:0;right:0;display:flex;justify-content:space-around;align-items:center;padding:.5rem 1rem;padding-bottom:calc(.5rem + env(safe-area-inset-bottom,0px));background:#1e1e28f2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-top:1px solid rgba(255,255,255,.1);z-index:100}.mobile-action-btn{display:flex;align-items:center;justify-content:center;width:48px;height:48px;background:transparent;border:2px solid transparent;color:#ffffffb3;cursor:pointer;border-radius:50%;transition:all .15s ease}.mobile-action-btn.mobile-action-info{background:#ffffff1f;color:#fffc}.mobile-action-btn.mobile-action-info:hover{background:#ffffff2e;color:#fff}.mobile-action-btn.mobile-action-info:active{background:#ffffff40;color:#fff}.mobile-action-btn.mobile-action-exit{background:#ffffff1f;color:#fffc}.mobile-action-btn.mobile-action-exit:hover{background:#ffffff2e;color:#fff}.mobile-action-btn.mobile-action-exit:active{background:#dc262626;border-color:#dc2626;color:#f87171}.mobile-action-btn.mobile-action-complete{background:#667eea40;color:#a5b4fc}.mobile-action-btn.mobile-action-complete:hover{background:#667eea59;color:#c7d2fe}.mobile-action-btn.mobile-action-complete:active{background:#667eea73;color:#fff}.mobile-action-icon{width:24px;height:24px}.mobile-action-label{display:none}.info-drawer-overlay{position:fixed;inset:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;display:flex;align-items:flex-end;animation:fadeIn .2s ease}.info-drawer{width:100%;max-height:85vh;background:#fff;border-radius:20px 20px 0 0;overflow:hidden;padding-top:.5rem;display:flex;flex-direction:column;will-change:transform}.info-drawer-handle{width:36px;height:4px;background:#d1d5db;border-radius:2px;margin:0 auto .75rem;cursor:grab;position:relative;touch-action:none}.info-drawer-handle:before{content:"";position:absolute;inset:-12px}.info-drawer-handle:active{cursor:grabbing}.info-drawer-content-wrapper{display:flex;flex-direction:column;flex:1;min-height:0;overflow-y:auto;touch-action:pan-y;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}.info-drawer-header{display:flex;align-items:center;justify-content:center;padding:.5rem 1.25rem 1rem;border-bottom:1px solid #e9ecef}.info-drawer-header h3{margin:0;font-size:1.1rem;font-weight:700;color:#2c3e50;text-align:center}.info-drawer-content{padding:1rem 1.25rem;overflow-y:auto;max-height:calc(85vh - 140px)}.info-section{margin-bottom:1.25rem}.info-section:last-child{margin-bottom:0}.info-section h4{margin:0 0 .5rem;font-size:.75rem;font-weight:600;color:#6c757d;text-transform:uppercase;letter-spacing:.5px}.info-stats-row{display:flex;gap:2rem;margin-bottom:.5rem}.info-stat{display:flex;flex-direction:column}.info-stat-value{font-size:1.5rem;font-weight:700;color:#2c3e50;line-height:1.2}.info-stat-label{font-size:.8rem;color:#6c757d}.info-detail{font-size:.95rem;color:#495057;padding:.25rem 0}.info-drawer-actions{display:flex;flex-direction:column;gap:.5rem;padding:1rem 1.25rem;padding-bottom:calc(1rem + env(safe-area-inset-bottom,0px));border-top:1px solid #e9ecef;background:#f8f9fa}.info-drawer-btn{width:100%;padding:1rem;border:2px solid transparent;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s}.info-drawer-btn-complete{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.info-drawer-btn-complete:hover,.info-drawer-btn-complete:active{background:linear-gradient(135deg,#5568d3,#6a3f8f)}.info-drawer-btn-exit{background:#f1f3f4;color:#2c3e50;margin-top:.5rem}.info-drawer-btn-exit:hover{background:#e5e7eb}.info-drawer-btn-exit:active{background:#fee2e2;border-color:#dc2626;color:#dc2626}@media(min-width:600px){.mobile-top-widget,.mobile-progress-section,.mobile-action-bar{display:none}}@media(max-width:599px){.training-header{display:none!important;visibility:hidden;position:absolute;top:-9999px;left:-9999px}.header-actions-left,.course-info,.session-progress{display:none!important}}@media(max-width:599px){body:has(.puzzle-container) .feedback-button-container,body:has(.puzzle-viewer-container) .feedback-button-container{display:none!important}}.training-header,.header-actions-left,.course-info,.session-progress{display:none}.btn-pause-exit{background:#fff3;border:1px solid rgba(255,255,255,.3);color:#fff;padding:.4rem .75rem;border-radius:8px;font-size:.75rem;font-weight:600;cursor:pointer;transition:all .2s;white-space:nowrap;flex:1}.btn-pause-exit:hover{background:#ffffff4d}.btn-complete-session{background:#4caf504d;border:1px solid rgba(76,175,80,.5);color:#fff;padding:.4rem .75rem;border-radius:8px;font-size:.75rem;font-weight:600;cursor:pointer;transition:all .2s;white-space:nowrap;flex:1}.btn-complete-session:hover{background:#4caf5080}.btn-exit{background:#fff3;border:1px solid rgba(255,255,255,.3);color:#fff;padding:.4rem .75rem;border-radius:8px;font-size:.8rem;font-weight:600;cursor:pointer;transition:all .2s;white-space:nowrap}.btn-exit:hover{background:#ffffff4d}.course-title{font-size:.95rem;font-weight:700;color:#fff;letter-spacing:.3px}.course-progress{font-size:.75rem;color:#ffffffd9;font-weight:500}.timer-section{display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.4rem .75rem;background:#0003;border-radius:25px}.timer-display{display:flex;align-items:center;gap:.3rem}.timer{font-size:1.1rem;font-weight:700;color:#fff;font-variant-numeric:tabular-nums;min-width:45px;text-align:right}.timer-separator{font-size:.9rem;color:#fff9;font-weight:500}.timer-total{font-size:.9rem;font-weight:600;color:#ffffffb3;font-variant-numeric:tabular-nums;min-width:45px;text-align:left}.timer.timer-warning{color:#ff6b6b;animation:pulse 1s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.6}}.btn-pause{background:#fff3;border:1px solid rgba(255,255,255,.3);color:#fff;padding:.4rem .6rem;border-radius:6px;font-size:1rem;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center}.btn-pause:hover{background:#ffffff4d}.session-progress .stat{font-size:.8rem;color:#ffffffe6;font-weight:500;white-space:nowrap}.session-progress .success-rate{font-size:1.1rem;font-weight:700;color:gold}.freeplay-header{display:none}.difficulty-selector{display:flex;gap:.5rem;justify-content:center;margin-bottom:1rem}.difficulty-btn{padding:.6rem 1rem;border:2px solid #e0e0e0;border-radius:25px;background:#fff;color:#2c3e50;font-size:.85rem;font-weight:600;cursor:pointer;transition:all .3s ease;text-transform:capitalize;flex:1}.difficulty-btn:hover{border-color:#667eea}.difficulty-btn.active{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-color:transparent;box-shadow:0 4px 12px #667eea66}.puzzle-content{display:flex;flex-direction:column;gap:.5rem;align-items:center;max-width:100%;margin:0 auto}.board-section{display:flex;flex-direction:column;align-items:center;gap:.5rem;width:100%}.board-wrapper{position:relative;display:flex;align-items:flex-start;justify-content:center;width:100%;max-width:100vw}.turn-indicator-row{display:flex;flex-direction:row;align-items:center;justify-content:flex-start;gap:.5rem;width:100%;padding:0 .5rem;box-sizing:border-box;min-height:44px}.turn-indicator{padding:.5rem 1.25rem;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-radius:20px;font-size:.9rem;font-weight:700;box-shadow:0 2px 8px #667eea40;text-align:center;letter-spacing:.3px;flex-shrink:1;min-width:0}.streak-indicator{display:flex;align-items:center;padding:.5rem .85rem;font-size:.95rem;font-weight:600;white-space:nowrap;animation:streakFadeIn .15s ease-in;flex-shrink:0;gap:.3rem}.streak-indicator svg{width:18px;height:18px}.streak-indicator.streak-hot svg{filter:drop-shadow(0 0 4px rgba(255,107,53,.6))}.streak-indicator.streak-fire svg{filter:drop-shadow(0 0 6px rgba(255,68,68,.8))}.streak-indicator.streak-warm{color:#f96}.streak-indicator.streak-hot{color:#ff6b35}.streak-indicator.streak-fire{color:#f44;text-shadow:0 0 8px rgba(255,68,68,.4)}.streak-count{font-variant-numeric:tabular-nums}@keyframes streakFadeIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}.btn-board-preferences{display:flex;background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#fff;padding:.5rem;border-radius:8px;font-size:1.3rem;cursor:pointer;transition:all .2s;align-items:center;justify-content:center;width:36px;height:36px;flex-shrink:0;margin-left:auto}.btn-board-preferences:hover{background:#ffffff26;border-color:#ffffff4d;transform:scale(1.05)}@media(max-width:600px){.btn-board-preferences{position:relative;right:auto;top:auto}}@media(min-width:601px){.board-section{position:relative}.turn-indicator-row{padding:0;justify-content:center}.turn-indicator{flex-shrink:0}.streak-indicator{position:absolute;right:0;bottom:.75rem}.btn-board-preferences{position:absolute;top:0;right:-45px;background:transparent;border:none;color:#fffc;margin-left:0}.btn-board-preferences:hover{color:#fff;background:transparent;transform:scale(1.15)}}.puzzle-meta{display:none}.puzzle-rating{font-size:.9rem;font-weight:700;display:flex;align-items:center;gap:.3rem}.puzzle-meta .puzzle-rating{color:#667eea}.fallback-tag{font-size:.7rem;color:#e67e22;background:#e67e221a;padding:.2rem .6rem;border-radius:12px;font-weight:600;border:1px solid rgba(230,126,34,.2)}.turn-indicator{padding:.5rem 1.25rem;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-radius:20px;font-size:.9rem;font-weight:700;box-shadow:0 2px 8px #667eea40;text-align:center;letter-spacing:.3px}.action-panel{display:none}.feedback{padding:1.25rem 1rem;border-radius:12px;text-align:center;font-weight:600;font-size:1rem;transition:all .3s ease;box-shadow:0 4px 12px #00000014;min-height:70px;display:flex;align-items:center;justify-content:center}.feedback-loading{background:#e3f2fd;color:#1976d2}.feedback-playing{background:#f5f5f5;color:#2c3e50}.feedback-correct{background:#d4edda;color:#155724;animation:popIn .4s ease}.feedback-incorrect{background:#f8d7da;color:#721c24;animation:shake .5s ease}.feedback-solved{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;animation:celebration .6s ease}@keyframes popIn{0%{transform:scale(.9);opacity:0}50%{transform:scale(1.05)}to{transform:scale(1);opacity:1}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-8px)}75%{transform:translate(8px)}}@keyframes celebration{0%{transform:scale(.95)}50%{transform:scale(1.05)}to{transform:scale(1)}}.controls{display:flex;flex-direction:column;gap:.5rem}.btn{padding:.75rem 1rem;border:none;border-radius:10px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s ease;letter-spacing:.3px;display:flex;align-items:center;justify-content:center;gap:.5rem}.btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 4px 12px #00000026}.btn:active:not(:disabled){transform:translateY(0)}.btn:disabled{opacity:.4;cursor:not-allowed;transform:none}.btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;box-shadow:0 2px 8px #667eea40}.btn-primary:hover:not(:disabled){background:linear-gradient(135deg,#5568d3,#6a3f8f);box-shadow:0 4px 16px #667eea59}.btn-primary.btn-large{padding:1rem 1.25rem;font-size:1rem;font-weight:700}.btn-secondary{background:#fff;color:#6c757d;border:2px solid #e0e0e0}.btn-secondary:hover:not(:disabled){background:#f8f9fa;border-color:#6c757d;color:#495057}.btn-success{background:linear-gradient(135deg,#4caf50,#45a049);color:#fff;border:2px solid rgba(76,175,80,.3);box-shadow:0 2px 8px #4caf5040}.btn-success:hover:not(:disabled){background:linear-gradient(135deg,#45a049,#3d8b40);box-shadow:0 4px 12px #4caf5066}.btn-danger{background:#fee2e2;color:#dc2626;border:2px solid rgba(220,38,38,.2)}.btn-danger:hover:not(:disabled){background:#fecaca;border-color:#dc26264d}.btn-hint{background:linear-gradient(135deg,gold,#ffc107);color:#3d3d00;box-shadow:0 2px 8px #ffc10740}.btn-hint:hover:not(:disabled){background:linear-gradient(135deg,#ffc107,#ffb300);box-shadow:0 4px 16px #ffc10759}.loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:300px;gap:1rem;text-align:center}.loading-woodie{width:100px;height:100px;animation:woodie-hop 1.5s ease-in-out infinite;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3))}@keyframes woodie-hop{0%,to{transform:translateY(0) rotate(0)}50%{transform:translateY(-20px) rotate(-5deg)}}.loading-animation{font-size:3rem;animation:chess-bounce 1s ease-in-out infinite}.loading-text{font-size:1.5rem;font-weight:600;color:#fff;text-shadow:0 2px 4px rgba(0,0,0,.3)}@keyframes chess-bounce{0%,to{transform:translateY(0) rotate(0)}25%{transform:translateY(-20px) rotate(-5deg)}75%{transform:translateY(-10px) rotate(5deg)}}.modal-overlay{position:fixed;inset:0;background:#000000bf;display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .3s ease;padding:1rem}.modal-content{background:#fff;border-radius:16px;padding:1.5rem;max-width:500px;width:100%;box-shadow:0 10px 40px #0000004d;animation:slideUp .3s ease;max-height:90vh;overflow-y:auto}@keyframes slideUp{0%{transform:translateY(30px);opacity:0}to{transform:translateY(0);opacity:1}}.modal-content h2{color:#2c3e50;font-size:1.5rem;margin-bottom:1.5rem;text-align:center}.session-results{display:flex;flex-direction:column;gap:1rem;margin-bottom:1.5rem}.result-item{display:flex;justify-content:space-between;align-items:center;padding:.75rem;background:#f8f9fa;border-radius:8px}.result-label{font-size:.95rem;color:#555;font-weight:500}.result-value{font-size:1.25rem;color:#2c3e50;font-weight:700}.modal-content .btn{width:100%;padding:.875rem;font-size:1rem}.pause-overlay{position:fixed;inset:0;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:flex-end;justify-content:center;z-index:1000;animation:fadeIn .2s ease}.pause-action-sheet{width:100%;background:#fff;border-radius:20px 20px 0 0;padding:.75rem 1.25rem 1.5rem;padding-bottom:calc(1.5rem + env(safe-area-inset-bottom,0px));display:flex;flex-direction:column;will-change:transform}.pause-sheet-handle{width:36px;height:4px;background:#d1d5db;border-radius:2px;margin:0 auto 1rem;cursor:grab;position:relative;touch-action:none}.pause-sheet-handle:before{content:"";position:absolute;inset:-12px}.pause-sheet-handle:active{cursor:grabbing}.pause-sheet-content-wrapper{overflow-y:auto;touch-action:pan-y;-webkit-overflow-scrolling:touch;overscroll-behavior:contain}.pause-sheet-header{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.5rem;padding:.5rem 0 1rem;border-bottom:1px solid #e9ecef;margin-bottom:.75rem}.pause-sheet-title{font-size:1.25rem;font-weight:700;color:#2c3e50}.pause-sheet-stats{display:flex;flex-direction:column;align-items:center;gap:.15rem;font-size:.8rem;color:#6b7280}.pause-sheet-actions{display:flex;flex-direction:column;gap:.5rem}.pause-sheet-btn{width:100%;padding:1rem;border:none;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s;background:#f1f3f4;color:#2c3e50}.pause-sheet-btn:hover,.pause-sheet-btn:active{background:#e5e7eb}.pause-sheet-btn-neutral{background:#f1f3f4;color:#2c3e50}.pause-sheet-btn-neutral:hover{background:#e5e7eb}.pause-sheet-btn-neutral:active{background:#d1d5db}.pause-sheet-btn-complete{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.pause-sheet-btn-complete:hover,.pause-sheet-btn-complete:active{background:linear-gradient(135deg,#5568d3,#6a3f8f)}.pause-sheet-btn-exit{background:#f1f3f4;color:#2c3e50;margin-top:.75rem;border:2px solid transparent}.pause-sheet-btn-exit:hover{background:#e5e7eb}.pause-sheet-btn-exit:active{background:#fee2e2;border-color:#dc2626;color:#dc2626}@media(min-width:600px){.pause-overlay{align-items:center;padding:1rem}.pause-action-sheet{max-width:400px;border-radius:20px;padding:1.5rem}.pause-sheet-handle{display:none}}@media(min-width:600px){.puzzle-container{padding:1rem}.training-header{display:flex;flex-direction:row;flex-wrap:wrap;align-items:center;justify-content:center;gap:1rem;padding:1rem;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:8px;margin-bottom:.5rem;box-shadow:0 2px 8px #667eea4d}.header-actions-left{display:flex;gap:.5rem;align-items:center;order:0;flex:0 0 auto}.course-info{display:flex;flex-direction:column;gap:.15rem;order:1;flex:1;text-align:left}.session-progress{display:flex;gap:1rem;align-items:center;flex-wrap:wrap;order:3;justify-content:flex-end}.btn-pause-exit,.btn-complete-session{flex:0 0 auto;padding:.5rem 1rem;font-size:.85rem}.course-title{font-size:1rem}.course-progress{font-size:.8rem}.timer-section{order:2;padding:.4rem 1rem}.timer{font-size:1.3rem;min-width:55px}.timer-total{font-size:1.1rem;min-width:55px}.timer-separator{font-size:1rem}.btn-board-preferences{position:absolute;top:0;right:-45px;background:transparent;border:none;color:#fffc;font-size:1.5rem;width:40px;height:40px}.btn-board-preferences:hover{color:#fff;background:transparent;transform:scale(1.15)}.puzzle-meta{display:flex;gap:1rem;align-items:center;padding:.5rem 1rem;background:#fff;border-radius:25px;box-shadow:0 2px 8px #00000014}.action-panel{display:flex;flex-direction:column;gap:1rem;width:100%;max-width:400px}.freeplay-header{display:flex;flex-direction:column;gap:1rem;margin-bottom:1.5rem}.puzzle-content{gap:1rem}.board-section{gap:.75rem}.turn-indicator{padding:.6rem 1.5rem;font-size:1rem}.pause-actions{flex-direction:row;flex-wrap:wrap}.btn-resume,.btn-complete,.btn-exit-session{flex:1;min-width:150px}.modal-content{padding:2rem}.modal-content h2{font-size:1.75rem}.pause-modal{padding:2.5rem}.pause-modal h2{font-size:1.75rem}}@media(min-width:900px){.puzzle-container{padding:1.5rem}.training-header{gap:2rem;padding:1rem 1.5rem;margin-bottom:2rem;border-radius:12px}.course-title{font-size:1.1rem}.course-progress{font-size:.85rem}.timer-section{padding:.5rem 1.25rem}.timer{font-size:1.5rem;min-width:65px}.timer-total{font-size:1.2rem;min-width:65px}.timer-separator{font-size:1.2rem}.session-progress{gap:1.5rem}.session-progress .stat{font-size:.9rem}.session-progress .success-rate{font-size:1.3rem}.puzzle-content{flex-direction:row;gap:3rem;align-items:flex-start;justify-content:center;max-width:1100px}.board-section{width:auto;gap:1rem}.action-panel{width:280px;max-width:280px}.feedback{padding:1.75rem 1.5rem;font-size:1.15rem;min-height:100px}.btn{padding:.875rem 1.25rem;font-size:.95rem}.loading{min-height:400px;gap:1.5rem}.loading-woodie{width:150px;height:150px}.loading-animation{font-size:4rem}.loading-text{font-size:2rem}.difficulty-btn{flex:0 0 auto;padding:.75rem 1.5rem;font-size:1rem}.difficulty-btn:hover{transform:translateY(-2px);box-shadow:0 4px 8px #00000026}.puzzle-meta{gap:1.5rem;padding:.75rem 1.5rem}.puzzle-rating{font-size:1rem}.turn-indicator{padding:.75rem 2rem;font-size:1.15rem;border-radius:25px}.modal-content{padding:2.5rem}.modal-content h2{font-size:2rem;margin-bottom:2rem}.session-results{gap:1.5rem;margin-bottom:2rem}.result-item{padding:1rem}.result-label{font-size:1.1rem}.result-value{font-size:1.5rem}.modal-content .btn{padding:1rem;font-size:1.1rem}.pause-modal{padding:3rem}.pause-modal h2{font-size:2rem;margin-bottom:1rem}.pause-message{font-size:1.1rem;margin-bottom:1rem}.pause-stats{padding:1.5rem;margin-bottom:2rem}.pause-stat-item{padding:.75rem 0}.pause-stat-label{font-size:.95rem}.pause-stat-value{font-size:1.2rem}.btn-resume,.btn-complete,.btn-exit-session{font-size:1.1rem;padding:1rem 2rem;min-width:180px}}@media(min-width:1200px){.puzzle-content{gap:4rem;max-width:1200px}}.session-complete-modal{text-align:center}.session-stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem;margin-bottom:1.5rem;background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-radius:12px;padding:1rem}.stat-item{display:flex;flex-direction:column;align-items:center;gap:.15rem}.stat-item .stat-icon{font-size:1.25rem;line-height:1}.stat-item .stat-value{font-size:1.5rem;font-weight:700;color:#2c3e50}.stat-item .stat-label{font-size:.7rem;font-weight:600;color:#6c757d;text-transform:uppercase;letter-spacing:.5px}.attempted-puzzles-section{margin-bottom:1.5rem}.attempted-puzzles-section h3{font-size:.9rem;font-weight:600;color:#6c757d;margin-bottom:.75rem;text-transform:uppercase;letter-spacing:.5px}.attempts-list{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center;max-height:200px;overflow-y:auto;padding:.25rem}.attempt-item{display:flex;align-items:center;gap:.35rem;padding:.4rem .7rem;border-radius:20px;border:none;cursor:pointer;font-size:.85rem;font-weight:600;transition:all .2s ease;background:#f8f9fa}.attempt-item:hover{transform:translateY(-2px);box-shadow:0 4px 12px #00000026}.attempt-item.correct{background:linear-gradient(135deg,#d4edda,#c3e6cb);color:#155724}.attempt-item.correct:hover{background:linear-gradient(135deg,#c3e6cb,#b1dfbb)}.attempt-item.incorrect{background:linear-gradient(135deg,#f8d7da,#f1c0c4);color:#721c24}.attempt-item.incorrect:hover{background:linear-gradient(135deg,#f1c0c4,#e8a9ae)}.attempt-item.incomplete{background:linear-gradient(135deg,#fff3cd,#ffeaa7);color:#856404}.attempt-item.incomplete:hover{background:linear-gradient(135deg,#ffeaa7,#fde68a)}.attempt-indicator{font-size:1rem;font-weight:700}.attempt-rating{font-variant-numeric:tabular-nums}@media(max-width:599px){.session-stats-row{grid-template-columns:repeat(2,1fr);gap:.75rem}.stat-item .stat-icon{font-size:1.1rem}.stat-item .stat-value{font-size:1.25rem}.stat-item .stat-label{font-size:.65rem}.attempts-list{max-height:150px}.attempt-item{padding:.35rem .6rem;font-size:.8rem}}@media(min-width:600px){.stat-item .stat-icon{font-size:1.4rem}.stat-item .stat-value{font-size:1.75rem}.stat-item .stat-label{font-size:.75rem}.attempts-list{max-height:250px}}@media(min-width:900px){.session-stats-row{padding:1.25rem;gap:1rem}.stat-item .stat-icon{font-size:1.6rem}.stat-item .stat-value{font-size:2rem}.stat-item .stat-label{font-size:.8rem}.attempt-item{padding:.5rem .85rem;font-size:.9rem}}.theme-selector{margin:20px 0;padding:15px;background:#ffffff0d;border-radius:8px}.theme-selector-label{display:block;font-size:14px;font-weight:600;margin-bottom:12px;color:#e8e8e8}.theme-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:10px}.theme-option{display:flex;flex-direction:column;align-items:center;gap:6px;padding:8px;background:#ffffff0d;border:2px solid transparent;border-radius:6px;cursor:pointer;transition:all .2s ease}.theme-option:hover{background:#ffffff1a;transform:translateY(-2px)}.theme-option.selected{border-color:#4caf50;background:#4caf501a}.theme-preview{display:grid;grid-template-columns:repeat(2,1fr);width:40px;height:40px;border-radius:4px;overflow:hidden;box-shadow:0 2px 4px #0003}.theme-square{width:100%;height:100%}.theme-square.light{grid-column:1;grid-row:1}.theme-square.dark{grid-column:2;grid-row:1}.theme-name{font-size:11px;text-align:center;color:#e8e8e8;line-height:1.2}@media(max-width:600px){.theme-grid{grid-template-columns:repeat(auto-fill,minmax(80px,1fr));gap:8px}.theme-option{padding:6px}.theme-preview{width:32px;height:32px}.theme-name{font-size:10px}}.piece-set-selector{margin:20px 0;padding:15px;background:#ffffff0d;border-radius:8px}.piece-set-selector-label{display:block;font-size:14px;font-weight:600;margin-bottom:12px;color:#e8e8e8}.piece-set-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:10px}.piece-set-option{display:flex;flex-direction:column;align-items:center;gap:6px;padding:12px 8px;background:#ffffff0d;border:2px solid transparent;border-radius:6px;cursor:pointer;transition:all .2s ease}.piece-set-option:hover{background:#ffffff1a;transform:translateY(-2px)}.piece-set-option.selected{border-color:#4caf50;background:#4caf501a}.piece-set-preview{display:flex;align-items:center;justify-content:center;gap:2px;width:60px;height:50px;border-radius:4px;background:#ffffff1a;padding:4px}.piece-preview-img{width:48%;height:auto;object-fit:contain}.piece-set-name{font-size:11px;text-align:center;color:#e8e8e8;line-height:1.2;font-weight:500}@media(max-width:600px){.piece-set-grid{grid-template-columns:repeat(auto-fill,minmax(80px,1fr));gap:8px}.piece-set-option{padding:8px 6px}.piece-set-preview{width:50px;height:40px}.piece-set-name{font-size:10px}}.preferences-modal{max-width:700px;width:90%;max-height:90vh;overflow-y:auto;background:linear-gradient(135deg,#1e3a5f,#2d1b3d);animation:fadeIn .3s ease}@media(min-width:600px){.modal-content.preferences-modal{display:block!important}}@keyframes slideUpDrawer{0%{transform:translateY(100%)}to{transform:translateY(0)}}.preferences-modal .modal-header{border-bottom-color:#fff3}.preferences-modal .modal-header h2{color:#fff}.preferences-modal .close-btn{color:#fffc}.preferences-modal .close-btn:hover{background-color:#ffffff1a;color:#fff}.preferences-content{padding:20px;min-height:200px}.preferences-footer{padding:15px 20px;border-top:1px solid rgba(255,255,255,.1);display:flex;justify-content:flex-end;gap:10px}.preferences-footer .btn{min-width:100px}@media(max-width:600px){.preferences-bottom-sheet{position:fixed;bottom:0;left:0;right:0;background:linear-gradient(135deg,#1e3a5f,#2d1b3d);border-radius:1rem 1rem 0 0;max-height:85vh;display:flex;flex-direction:column;box-shadow:0 -4px 20px #0000004d;will-change:transform;overflow:hidden}.preferences-sheet-handle{width:48px;height:4px;background:#ffffff4d;border-radius:2px;margin:.75rem auto;flex-shrink:0;cursor:grab;position:relative;touch-action:none}.preferences-sheet-handle:before{content:"";position:absolute;inset:-12px}.preferences-sheet-handle:active{cursor:grabbing}.preferences-sheet-content{display:flex;flex-direction:column;overflow-y:auto;overflow-x:hidden;flex:1;min-height:0;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;touch-action:pan-y}.preferences-bottom-sheet .modal-header{flex-shrink:0;border-bottom-color:#fff3;padding:1rem 1.5rem;display:block;text-align:center}.preferences-bottom-sheet .modal-header h2{color:#fff;margin:0}.preferences-bottom-sheet .close-btn{color:#fffc}.preferences-bottom-sheet .preferences-content{padding-bottom:2rem}.preferences-bottom-sheet .preferences-footer{flex-shrink:0;border-top:1px solid rgba(255,255,255,.1)}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}}.login-page{min-height:100vh;background:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460);display:flex;align-items:center;justify-content:center;padding:20px;position:relative;overflow:hidden}.login-page:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(255,255,255,.03) 1px,transparent 1px);background-size:50px 50px;animation:moveBackground 20s linear infinite}@keyframes moveBackground{0%{transform:translate(0)}to{transform:translate(50px,50px)}}.login-container{max-width:480px;width:100%;position:relative;z-index:1}.login-header{text-align:center;margin-bottom:2rem}.login-logo{width:100px;height:100px;margin-bottom:1rem;filter:drop-shadow(0 4px 12px rgba(255,255,255,.1));animation:floatLogo 3s ease-in-out infinite}@keyframes floatLogo{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.login-header h1{color:#fff;font-size:2.5rem;margin:0;text-shadow:0 2px 10px rgba(0,0,0,.3)}.login-tagline{color:#ffffffb3;font-size:1rem;margin:.5rem 0 0}.login-card{background:#fffffff2;border-radius:20px;padding:3rem 2.5rem;box-shadow:0 20px 60px #0000004d;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.login-card h2{color:#1a1a2e;font-size:1.8rem;margin:0 0 .5rem;text-align:center}.login-subtitle{color:#666;text-align:center;margin:0 0 2rem;font-size:.95rem}.login-providers{display:flex;flex-direction:column;gap:1rem}.login-btn{display:flex;align-items:center;justify-content:center;gap:12px;padding:14px 24px;font-size:1rem;font-weight:600;border:none;border-radius:12px;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 12px #0000001a;position:relative;overflow:hidden}.login-btn:before{content:"";position:absolute;top:50%;left:50%;width:0;height:0;border-radius:50%;background:#fff3;transform:translate(-50%,-50%);transition:width .6s,height .6s}.login-btn:hover:before{width:300px;height:300px}.provider-icon{width:24px;height:24px;position:relative;z-index:1;object-fit:contain}.login-btn span{position:relative;z-index:1}.login-btn-google{background:#fff;color:#333;border:2px solid #e0e0e0}.login-btn-google:hover{border-color:#4285f4;box-shadow:0 6px 20px #4285f44d;transform:translateY(-2px)}.login-btn-lichess{background:#000;color:#fff}.login-btn-lichess .provider-icon{filter:brightness(0) invert(1)}.login-btn-lichess:hover{background:#1a1a1a;box-shadow:0 6px 20px #0006;transform:translateY(-2px)}.login-btn-chesscom{background:#7fa650;color:#fff}.login-btn-chesscom:hover{background:#8eb55e;box-shadow:0 6px 20px #7fa65066;transform:translateY(-2px)}.login-divider{display:flex;align-items:center;margin:1.5rem 0}.login-divider:before,.login-divider:after{content:"";flex:1;height:1px;background:#e0e0e0}.login-divider span{padding:0 1rem;color:#999;font-size:.9rem;font-weight:500;text-transform:uppercase;letter-spacing:.5px}.login-btn-guest{background:transparent;color:#1a1a2e;border:2px solid #e0e0e0;width:100%}.login-btn-guest:hover{border-color:#667eea;background:#667eea0d;box-shadow:0 4px 12px #667eea26;transform:translateY(-2px)}.login-btn-guest:disabled{opacity:.6;cursor:not-allowed;transform:none}.login-guest-info{text-align:center;margin:1.25rem 0 0;line-height:1.5}.login-guest-info .info-label{display:block;color:#555;font-size:.8rem;font-weight:600;margin-bottom:.25rem}.login-guest-info .info-text{display:block;color:#888;font-size:.8rem}.login-footer{margin-top:1.5rem;text-align:center}.login-note{color:#666;font-size:.85rem;margin:0;display:flex;align-items:center;justify-content:center;gap:6px}@media(max-width:640px){.login-card{padding:2rem 1.5rem}.login-header h1{font-size:2rem}.login-card h2{font-size:1.5rem}.login-btn{padding:12px 20px;font-size:.95rem}}.profile-page{min-height:100vh;background:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460);padding:40px 20px}.profile-container{max-width:800px;margin:0 auto}.profile-header{margin-bottom:2rem;display:flex;flex-direction:column;align-items:center;gap:.75rem}.profile-header h1{color:#fff;font-size:2.5rem;margin:0;text-shadow:0 2px 10px rgba(0,0,0,.3)}@media(max-width:600px){.profile-header{margin-bottom:1rem;flex-direction:row;align-items:center}.profile-header h1{font-size:1.5rem}}.btn-back{background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#fff;padding:10px 20px;border-radius:8px;cursor:pointer;font-size:.95rem;transition:all .3s ease}.btn-back:hover{background:#fff3;transform:translate(-4px)}.profile-card{background:#fffffff2;border-radius:20px;padding:3rem;box-shadow:0 20px 60px #0000004d;display:grid;grid-template-columns:auto 1fr;gap:3rem;margin-bottom:2rem}.profile-picture-section{display:flex;flex-direction:column;align-items:center;gap:1rem}@media(max-width:600px){.profile-picture-section{padding-bottom:.75rem;margin-bottom:.75rem;border-bottom:1px solid #e9ecef;gap:.25rem}}.profile-picture-wrapper{position:relative;width:150px;height:150px;border-radius:50%;overflow:hidden;border:4px solid #f0f0f0;box-shadow:0 8px 24px #00000026;cursor:pointer;transition:transform .2s,box-shadow .2s}.profile-picture-wrapper:hover{transform:scale(1.05);box-shadow:0 10px 28px #0003}@media(max-width:600px){.profile-picture-wrapper{width:120px;height:120px}}.profile-picture{width:100%;height:100%;object-fit:cover}.profile-picture-placeholder{width:100%;height:100%;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;align-items:center;justify-content:center;font-size:4rem;color:#fff;font-weight:700}.upload-overlay{position:absolute;inset:0;background:#0009;display:flex;align-items:center;justify-content:center}.btn-upload-picture{background:#667eea;color:#fff;padding:10px 24px;border-radius:8px;cursor:pointer;font-size:.9rem;font-weight:600;border:none;transition:all .3s ease;text-align:center}.btn-upload-picture:hover{background:#5568d3;transform:translateY(-2px);box-shadow:0 4px 12px #667eea66}.profile-info{display:flex;flex-direction:column;gap:1.5rem}.profile-field{display:flex;flex-direction:column;gap:.5rem}.profile-field label{font-size:.85rem;font-weight:600;color:#666;text-transform:uppercase;letter-spacing:.5px}.profile-field p{font-size:1.1rem;color:#1a1a2e;margin:0}.profile-field-muted{margin-top:.75rem;padding-top:.5rem;border-top:1px solid #e9ecef}.profile-field-muted label{font-size:.75rem;color:#999}.profile-field-muted p{font-size:.9rem;color:#999}@media(max-width:600px){.profile-field:has(.providers-list){padding-top:.75rem;margin-top:.75rem;border-top:1px solid #e9ecef}.btn-edit{margin-bottom:.75rem;padding-bottom:.75rem;border-bottom:1px solid #e9ecef}.profile-field:not(.profile-field-muted):not(:has(.providers-list)){margin-bottom:.5rem}}@media(max-width:600px){.profile-field{flex-direction:row;justify-content:space-between;align-items:center;gap:1rem}.profile-field label{flex-shrink:0;min-width:100px}.profile-field p{text-align:right;word-break:break-word}.profile-field:has(.providers-list){flex-direction:column;align-items:flex-start}.profile-field:has(.providers-list) label{min-width:auto}.profile-field:has(label:first-child:contains("Email")){flex-direction:column;align-items:flex-start}.profile-field:nth-child(3){flex-direction:column;align-items:flex-start}.profile-field:nth-child(3) p{text-align:left}}.providers-list{display:flex;flex-wrap:wrap;gap:10px}.provider-badge{display:inline-flex;align-items:center;gap:8px;background:#f8f9fa;border:1px solid #e9ecef;padding:10px 16px;border-radius:12px;font-size:.95rem!important;width:fit-content;box-shadow:0 2px 4px #0000000d}.provider-badge span{font-weight:500;color:#2c3e50}.form-group{display:flex;flex-direction:column;gap:.5rem}.form-group label{font-size:.85rem;font-weight:600;color:#666;text-transform:uppercase;letter-spacing:.5px}.profile-input{padding:12px;border:2px solid #e0e0e0;border-radius:8px;font-size:1rem;transition:all .3s ease}.profile-input:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.profile-input.input-error{border-color:#dc3545}.profile-input.input-error:focus{box-shadow:0 0 0 3px #dc35451a}.profile-input.input-valid{border-color:#28a745}.profile-input.input-valid:focus{box-shadow:0 0 0 3px #28a7451a}.username-input-wrapper{position:relative;display:flex;align-items:center}.username-input-wrapper .profile-input{width:100%;padding-right:40px}.username-status{position:absolute;right:12px;font-size:1.1rem}.username-status.checking{animation:pulse 1s infinite}.username-status.available{color:#28a745}.username-status.taken{color:#dc3545}.username-error{color:#dc3545;font-size:.85rem;margin-top:4px}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.btn-save:disabled{background:#ccc;cursor:not-allowed;transform:none;box-shadow:none}.btn-save:disabled:hover{background:#ccc;transform:none;box-shadow:none}.profile-actions{display:flex;gap:1rem;margin-top:1rem}.btn-save,.btn-edit,.btn-cancel{padding:12px 24px;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;border:none}.btn-save,.btn-edit{background:#667eea;color:#fff}.btn-save:hover,.btn-edit:hover{background:#5568d3;transform:translateY(-2px);box-shadow:0 4px 12px #667eea66}.btn-cancel{background:#f0f0f0;color:#666}.btn-cancel:hover{background:#e0e0e0}.profile-actions-bottom{text-align:center}.btn-logout{background:#dc3545e6;color:#fff;padding:12px 32px;border-radius:8px;font-size:1rem;font-weight:600;border:none;cursor:pointer;transition:all .3s ease}.btn-logout:hover{background:#dc3545;transform:translateY(-2px);box-shadow:0 4px 12px #dc354566}.profile-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;gap:1rem}.profile-loading p{color:#fff;font-size:1.2rem}.spinner{width:40px;height:40px;border:4px solid rgba(255,255,255,.2);border-top-color:#fff;border-radius:50%;animation:spin 1s linear infinite}.profanity-warning{display:flex;align-items:flex-start;gap:12px;background:linear-gradient(135deg,#fff3cd,#ffeeba);border:1px solid #ffc107;border-left:4px solid #dc3545;border-radius:8px;padding:16px;margin-top:8px}.profanity-warning-icon{font-size:1.5rem;flex-shrink:0}.profanity-warning-content{display:flex;flex-direction:column;gap:4px}.profanity-warning-message{color:#856404;font-weight:600;font-size:.95rem;margin:0}.profanity-warning-notice{color:#dc3545;font-size:.85rem;margin:0;font-weight:500}@media(max-width:768px){.profile-card{grid-template-columns:1fr;gap:1.25rem;padding:1.5rem}.profile-picture-section{margin:0 auto}.profile-actions{flex-direction:column}.btn-save,.btn-edit,.btn-cancel{width:100%}}.about-page{max-width:900px;margin:0 auto;padding:.75rem;min-height:100vh}.about-header{display:flex;flex-direction:column;align-items:center;gap:.75rem;margin-bottom:1.5rem}@media(max-width:600px){.about-header{flex-direction:column;align-items:center;gap:1rem}.about-title h1{font-size:1.5rem}.about-title .tagline{font-size:.85rem}.about-logo{width:64px;height:64px}}.about-title{display:flex;flex-direction:column;align-items:center;gap:.75rem;text-align:center}.about-logo{width:64px;height:64px;filter:drop-shadow(0 4px 8px rgba(0,0,0,.3))}.about-title h1{font-size:1.5rem;color:#fff;margin:0;font-weight:700;text-shadow:0 2px 4px rgba(0,0,0,.2)}.tagline{color:#ffffffe6;font-size:.85rem;margin:0;font-weight:500}.btn-get-started{background:linear-gradient(135deg,gold,#ffb300);border:none;color:#1a1a1a;padding:12px 20px;border-radius:12px;font-size:.9rem;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 12px #ffc10766;white-space:nowrap;width:100%;max-width:320px}.btn-get-started:hover{transform:translateY(-2px);box-shadow:0 6px 20px #ffc10780}.about-content{display:flex;flex-direction:column;gap:1rem}.about-section{background:#fff;border-radius:16px;padding:1.25rem;box-shadow:0 4px 12px #0000001a}.about-section h2{font-size:1.15rem;color:#2c3e50;margin:0 0 .75rem;font-weight:700}.about-section p{font-size:.95rem;color:#495057;line-height:1.7;margin:0 0 .75rem}.about-section p:last-child{margin-bottom:0}.about-section ul{margin:.75rem 0;padding-left:1.5rem;color:#495057}.about-section li{font-size:.95rem;line-height:1.6;margin-bottom:.5rem}.about-section li:last-child{margin-bottom:0}.intro-section{background:linear-gradient(135deg,#667eea,#764ba2);border:none}.intro-section p{color:#fff;font-size:1rem;font-weight:500}.intro-section strong{color:gold}.highlight-section{background:linear-gradient(135deg,#f8f9fa,#fff);border:2px solid #667eea}.feature-list{list-style:none;padding:0;margin:1rem 0}.feature-list li{background:#fff;padding:1rem;border-radius:10px;margin-bottom:.75rem;box-shadow:0 2px 6px #00000014;border-left:4px solid #667eea}.feature-list li:last-child{margin-bottom:0}.feature-list strong{color:#667eea}.closing-statement{font-weight:600;color:#2c3e50!important;text-align:center;font-style:italic;margin-top:1rem!important}.screenshots-section{background:linear-gradient(135deg,#f8f9fa,#e9ecef)}.screenshots-grid{display:flex;flex-direction:column;gap:1.5rem;margin-top:1rem}.screenshot-item{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 12px #0000001a;transition:transform .3s ease,box-shadow .3s ease}.screenshot-item:hover{transform:translateY(-4px);box-shadow:0 8px 24px #00000026}.screenshot-item img{width:100%;height:auto;display:block}.screenshot-caption{padding:.75rem 1rem;margin:0;font-size:.9rem;color:#495057;text-align:center;background:#f8f9fa;font-weight:500}.community-section{text-align:center}.btn-reddit{display:inline-flex;align-items:center;gap:.5rem;background:#ff4500;color:#fff;padding:10px 20px;border-radius:8px;font-size:.95rem;font-weight:600;text-decoration:none;transition:all .3s ease;box-shadow:0 2px 8px #ff45004d;margin-top:.5rem}.btn-reddit:hover{transform:translateY(-2px);box-shadow:0 4px 12px #ff450066;background:#e03d00}.reddit-icon{flex-shrink:0}.seo-content-section{background:linear-gradient(135deg,#f0f4f8,#e8eef5);border-left:4px solid #667eea}.seo-content-section h2{color:#4a5568}.seo-content-section strong{color:#667eea}.cta-section{background:linear-gradient(135deg,#667eea,#764ba2);text-align:center;padding:2rem 1.5rem!important}.cta-section h2{color:#fff!important;font-size:1.5rem!important;margin-bottom:.5rem!important}.cta-section p{color:#ffffffe6!important;font-size:1.1rem!important;margin-bottom:1.5rem!important}.btn-cta{background:linear-gradient(135deg,gold,#ffb300);border:none;color:#1a1a1a;padding:14px 32px;border-radius:12px;font-size:1rem;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 12px #ffc10766;width:100%;max-width:320px}.btn-cta:hover{transform:translateY(-3px);box-shadow:0 8px 24px #ffc10780}@media(min-width:600px){.about-page{padding:1.5rem}.about-header{flex-direction:row;align-items:center;justify-content:space-between}.about-title{flex-direction:row;flex-wrap:wrap;gap:1rem;align-items:center}.tagline{width:100%;text-align:left;margin-left:76px;font-size:1rem}.about-logo{width:60px;height:60px}.about-title h1{font-size:2rem}.btn-get-started{width:auto;max-width:none;padding:14px 28px;font-size:1rem}.about-content{gap:1.25rem}.about-section{padding:1.5rem}.about-section h2{font-size:1.3rem}.about-section p{font-size:1rem}.intro-section p{font-size:1.1rem}.screenshots-grid{flex-direction:row;flex-wrap:wrap}.screenshot-item{flex:1 1 calc(50% - .75rem);min-width:280px}.cta-section{padding:2.5rem 2rem!important}.btn-cta{width:auto;max-width:none;padding:16px 40px;font-size:1.1rem}}@media(min-width:900px){.about-page{padding:2rem;max-width:1100px}.about-header{margin-bottom:2rem}.btn-back{padding:12px 24px;font-size:1rem}.btn-back:hover{transform:translateY(-2px);box-shadow:0 4px 12px #fff3}.about-logo{width:80px;height:80px}.about-title h1{font-size:2.5rem}.tagline{font-size:1.2rem;margin-left:96px}.btn-get-started{padding:16px 36px;font-size:1.1rem}.about-content{gap:1.5rem}.about-section{padding:2rem}.about-section h2{font-size:1.4rem;margin-bottom:1rem}.about-section p,.about-section li{font-size:1.05rem}.intro-section p{font-size:1.15rem}.feature-list li{padding:1.25rem}.screenshots-grid{gap:1.5rem}.screenshot-item{flex:1 1 calc(33.333% - 1rem);min-width:250px}.screenshot-caption{font-size:.95rem;padding:1rem}.cta-section{padding:3rem!important}.cta-section h2{font-size:1.75rem!important}.cta-section p{font-size:1.2rem!important}.btn-cta{padding:18px 50px;font-size:1.2rem}}.about-footer{text-align:center;padding:2rem 0 1rem;margin-top:2rem;color:#fffc;font-size:.9rem}.about-footer p{margin:0}.about-footer a{color:#ffffffe6;text-decoration:none;font-weight:500;transition:color .2s ease}.about-footer a:hover{color:gold;text-decoration:underline}.leaderboard-page{max-width:1000px;margin:0 auto;padding:.75rem;min-height:100vh}.leaderboard-header{display:flex;flex-direction:column;align-items:center;gap:.75rem;margin-bottom:1.5rem}@media(max-width:600px){.leaderboard-header{flex-direction:row;align-items:center;gap:.75rem}.header-title h1{font-size:1.5rem}.header-title .subtitle{font-size:.85rem}}.btn-back{align-self:flex-start;background:#ffffff1a;border:2px solid rgba(255,255,255,.2);color:#fff;padding:10px 20px;border-radius:12px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .3s ease}.header-title{text-align:center}.header-title h1{font-size:1.75rem;color:#fff;margin:0 0 .25rem;font-weight:700;text-shadow:0 2px 4px rgba(0,0,0,.2)}.header-title .subtitle{color:#ffffffe6;font-size:.9rem;margin:0}.leaderboard-filters{display:flex;flex-direction:column;gap:1rem;margin-bottom:1.5rem}.filter-section{background:#fff;border-radius:12px;padding:1rem;box-shadow:0 4px 12px #0000001a}.filter-label{display:block;font-size:.75rem;font-weight:600;color:#6c757d;text-transform:uppercase;letter-spacing:.5px;margin-bottom:.75rem}.difficulty-select{width:100%;padding:.75rem 2.5rem .75rem 1rem;font-size:1rem;font-weight:600;color:#2c3e50;background:#fff;border:2px solid #e0e0e0;border-radius:8px;cursor:pointer;transition:all .2s ease;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23667eea' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 1rem center}.difficulty-select:hover{border-color:#667eea}.difficulty-select:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 3px #667eea33}.difficulty-select option{font-weight:600;padding:.5rem}.metric-toggle{display:flex;gap:.5rem}.metric-btn{flex:1;padding:.75rem 1rem;border:2px solid #e0e0e0;border-radius:8px;background:#fff;cursor:pointer;font-size:.85rem;font-weight:600;color:#495057;transition:all .2s ease}.metric-btn:hover{border-color:#667eea}.metric-btn.active{border-color:#667eea;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.period-selector{display:flex;gap:.5rem}.period-btn{flex:1;padding:.65rem .75rem;border:2px solid #e0e0e0;border-radius:8px;background:#fff;cursor:pointer;font-size:.8rem;font-weight:600;color:#495057;transition:all .2s ease}.period-btn:hover{border-color:#667eea}.period-btn.active{border-color:#667eea;background:#667eea;color:#fff}.leaderboard-content{background:#fff;border-radius:16px;box-shadow:0 4px 16px #0000001a;overflow:hidden}.loading-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem 1rem;gap:1rem}.loading-state .spinner{width:40px;height:40px;border:3px solid #e0e0e0;border-top-color:#667eea;border-radius:50%;animation:spin 1s linear infinite}.loading-state p{color:#6c757d;font-size:.95rem}.error-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem 1rem;gap:1rem;text-align:center}.error-state p{color:#dc3545;font-size:.95rem}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem 1rem;text-align:center}.empty-icon{font-size:3rem;margin-bottom:1rem}.empty-state h3{color:#2c3e50;margin:0 0 .5rem;font-size:1.25rem}.empty-state p{color:#6c757d;margin:0;font-size:.9rem}.leaderboard-table-wrapper{overflow-x:auto}.leaderboard-table{width:100%;border-collapse:collapse}.leaderboard-table thead{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.leaderboard-table th{padding:.875rem .75rem;text-align:left;font-weight:600;font-size:.8rem;text-transform:uppercase;letter-spacing:.5px}.leaderboard-table td{padding:.875rem .75rem;border-bottom:1px solid #e9ecef}.leaderboard-row:hover{background:#f8f9fa}.leaderboard-row.current-user{background:linear-gradient(90deg,#667eea1a,#764ba21a)}.leaderboard-row.current-user:hover{background:linear-gradient(90deg,#667eea26,#764ba226)}.leaderboard-row.top-1{background:linear-gradient(90deg,#ffd70026,#ffd7000d)}.leaderboard-row.top-2{background:linear-gradient(90deg,#c0c0c026,#c0c0c00d)}.leaderboard-row.top-3{background:linear-gradient(90deg,#cd7f3226,#cd7f320d)}.rank-badge{display:inline-flex;align-items:center;justify-content:center;min-width:2rem;font-weight:700;font-size:1rem}.rank-badge.rank-1,.rank-badge.rank-2,.rank-badge.rank-3{font-size:1.25rem}.medal-gold{color:gold;filter:drop-shadow(0 2px 4px rgba(255,215,0,.3))}.medal-silver{color:silver;filter:drop-shadow(0 2px 4px rgba(192,192,192,.3))}.medal-bronze{color:#cd7f32;filter:drop-shadow(0 2px 4px rgba(205,127,50,.3))}.player-info{display:flex;align-items:center;gap:.75rem}.player-avatar{width:36px;height:36px;border-radius:50%;object-fit:cover;border:2px solid #e9ecef}.player-avatar-placeholder{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1rem}.player-name{font-weight:600;color:#2c3e50;display:flex;align-items:center;gap:.5rem;font-size:.9rem}.you-badge{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:.15rem .5rem;border-radius:4px;font-size:.65rem;font-weight:700;text-transform:uppercase}.stat-value{font-weight:700;color:#667eea;font-size:1rem}.stat-unit{font-weight:500;font-size:.75rem;color:#6c757d}.secondary-value{color:#6c757d;font-size:.85rem}.col-rank{width:60px}.col-player{min-width:150px}.col-stat{width:120px}.col-secondary{width:100px}@media(max-width:480px){.col-secondary{display:none}.leaderboard-table th:last-child,.leaderboard-table td:last-child{display:none}}@media(min-width:600px){.leaderboard-page{padding:1.25rem}.leaderboard-header{flex-direction:column;align-items:center;margin-bottom:2rem}.header-title{text-align:center}.header-title h1{font-size:2rem;line-height:1}.header-title .subtitle{font-size:1rem}.leaderboard-filters{flex-direction:row;flex-wrap:wrap;gap:1rem}.filter-section{flex:1;min-width:200px}.filter-section:first-child{flex:2;min-width:100%}.player-avatar,.player-avatar-placeholder{width:42px;height:42px}}.scroll-sentinel{min-height:1px;padding:.5rem 0}.loading-more{display:flex;align-items:center;justify-content:center;gap:.75rem;padding:1rem;color:#6c757d;font-size:.9rem}.spinner-small{width:20px;height:20px;border:2px solid #e0e0e0;border-top-color:#667eea;border-radius:50%;animation:spin 1s linear infinite}.results-info{text-align:center;padding:1rem;color:#6c757d;font-size:.85rem;border-top:1px solid #e9ecef}@media(min-width:900px){.leaderboard-page{padding:2rem}.leaderboard-header{margin-bottom:2.5rem}.header-title h1{font-size:2.5rem}.filter-section:first-child{flex:1;min-width:auto}.leaderboard-table th,.leaderboard-table td{padding:1rem}.player-avatar,.player-avatar-placeholder{width:48px;height:48px}.player-name{font-size:1rem}.stat-value{font-size:1.1rem}}.privacy-page{max-width:900px;margin:0 auto;padding:.75rem;min-height:100vh}.privacy-header{display:flex;flex-direction:column;align-items:center;gap:.75rem;margin-bottom:1.5rem}@media(max-width:600px){.privacy-header{flex-direction:column;align-items:center;gap:1rem}.privacy-title h1{font-size:1.5rem}}.privacy-title{display:flex;flex-direction:column;align-items:center;gap:.75rem;text-align:center}.privacy-title h1{font-size:2rem;color:#fff;margin:0;font-weight:700;text-shadow:0 2px 4px rgba(0,0,0,.2)}.privacy-content{background:#fffffff2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:16px;padding:1.5rem;box-shadow:0 4px 20px #00000026}@media(min-width:600px){.privacy-content{padding:2.5rem}}.privacy-section{margin-bottom:2rem}.privacy-section:last-child{margin-bottom:0}.privacy-last-updated{color:#6b7280;font-size:.9rem;margin-bottom:1rem;padding-bottom:1rem;border-bottom:2px solid #e5e7eb}.privacy-section h2{font-size:1.5rem;font-weight:700;color:#1f2937;margin-bottom:1rem;padding-bottom:.5rem;border-bottom:2px solid #667eea}.privacy-section h3{font-size:1.1rem;font-weight:600;color:#374151;margin-top:1.25rem;margin-bottom:.75rem}.privacy-section p{font-size:1rem;line-height:1.7;color:#374151;margin-bottom:1rem}.privacy-section ul{margin-left:1.5rem;margin-bottom:1rem}.privacy-section li{font-size:1rem;line-height:1.7;color:#374151;margin-bottom:.5rem}.privacy-section a{color:#667eea;text-decoration:none;font-weight:600;transition:color .2s ease}.privacy-section a:hover{color:#5568d3;text-decoration:underline}.privacy-section strong{font-weight:600;color:#1f2937}@media(max-width:600px){.privacy-section h2{font-size:1.25rem}.privacy-section h3{font-size:1rem}.privacy-section p,.privacy-section li{font-size:.95rem}}@media(min-width:900px){.privacy-section p,.privacy-section li{font-size:1.05rem;line-height:1.8}}@media print{.privacy-page{padding:0}.privacy-header{display:none}.privacy-content{background:#fff;box-shadow:none;border-radius:0}}.account-deletion-page{max-width:900px;margin:0 auto;padding:.75rem;min-height:100vh}.account-deletion-header{display:flex;flex-direction:column;align-items:center;gap:.75rem;margin-bottom:1.5rem}@media(max-width:600px){.account-deletion-header{flex-direction:column;align-items:center;gap:1rem}.account-deletion-title h1{font-size:1.5rem}}.btn-back{background:#ffffff1a;border:2px solid rgba(255,255,255,.2);color:#fff;padding:10px 20px;border-radius:12px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .3s ease;align-self:flex-start}.btn-back:hover{background:#fff3;border-color:#ffffff4d}@media(max-width:600px){.btn-back-icon{width:44px;height:44px;min-width:44px;min-height:44px;border-radius:50%;background:#ffffff26;border:none;padding:0;display:flex;align-items:center;justify-content:center}.btn-back-icon:hover{background:#ffffff40;transform:scale(1.05)}}.account-deletion-title{display:flex;flex-direction:column;align-items:center;gap:.75rem;text-align:center}.account-deletion-title h1{font-size:2rem;color:#fff;margin:0;font-weight:700;text-shadow:0 2px 4px rgba(0,0,0,.2)}.account-deletion-content{background:#fffffff2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:16px;padding:1.5rem;box-shadow:0 4px 20px #00000026}@media(min-width:600px){.account-deletion-content{padding:2.5rem}}.account-deletion-section{margin-bottom:1.5rem}.account-deletion-section:last-child{margin-bottom:0}.account-deletion-section p{font-size:1rem;line-height:1.7;color:#374151;margin-bottom:1rem}.account-deletion-section p:last-child{margin-bottom:0}.account-deletion-section strong{font-weight:600;color:#1f2937}.email-contact{font-size:1.25rem;font-weight:600;text-align:center;margin:1.5rem 0}.email-contact a{color:#667eea;text-decoration:none;transition:color .2s ease}.email-contact a:hover{color:#5568d3;text-decoration:underline}@media(max-width:600px){.account-deletion-title h1{font-size:1.25rem}.account-deletion-section p{font-size:.95rem}.email-contact{font-size:1.1rem}}@media(min-width:900px){.account-deletion-section p{font-size:1.05rem;line-height:1.8}}@media print{.account-deletion-page{padding:0}.account-deletion-header{display:none}.account-deletion-content{background:#fff;box-shadow:none;border-radius:0}}.feedback-trigger-btn{display:flex;align-items:center;gap:.5rem;padding:.625rem 1rem;background:#1a1a2e;border:1px solid rgba(124,58,237,.5);border-radius:10px;color:#fff;cursor:pointer;font-size:.875rem;font-weight:500;transition:all .2s ease;box-shadow:0 4px 12px #0000004d,0 0 0 1px #ffffff0d}.feedback-trigger-btn:hover{background:#252542;border-color:#7c3aedcc;box-shadow:0 6px 16px #0006,0 0 0 1px #ffffff1a;transform:translateY(-1px)}.feedback-trigger-btn:active{transform:translateY(0)}.feedback-trigger-btn svg{flex-shrink:0}@media(max-width:600px){.feedback-btn-text{display:none}.feedback-trigger-btn{padding:.75rem;border-radius:50%;width:48px;height:48px;justify-content:center}.feedback-trigger-btn svg{width:22px;height:22px}}.feedback-overlay{position:fixed;inset:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.feedback-modal{background:var(--bg-secondary, #1a1a2e);border-radius:16px;width:100%;max-width:480px;max-height:90vh;overflow-y:auto;box-shadow:0 20px 60px #00000080;animation:slideUp .3s ease}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.feedback-header{display:flex;align-items:center;justify-content:space-between;padding:1.25rem 1.5rem;border-bottom:1px solid rgba(255,255,255,.1)}.feedback-header h2{margin:0;font-size:1.25rem;font-weight:600;color:var(--text-primary, #fff)}.feedback-close-btn{background:none;border:none;font-size:1.75rem;color:var(--text-secondary, #aaa);cursor:pointer;padding:0;line-height:1;transition:color .2s}.feedback-close-btn:hover{color:var(--text-primary, #fff)}.feedback-form{padding:1.5rem}.feedback-field{margin-bottom:1.25rem}.feedback-field label{display:block;margin-bottom:.5rem;font-size:.875rem;font-weight:500;color:var(--text-secondary, #aaa)}.feedback-field input,.feedback-field textarea{width:100%;padding:.75rem 1rem;background:#ffffff0d;border:1px solid rgba(255,255,255,.15);border-radius:8px;color:var(--text-primary, #fff);font-size:1rem;font-family:inherit;transition:border-color .2s,background .2s;box-sizing:border-box}.feedback-field input:focus,.feedback-field textarea:focus{outline:none;border-color:var(--accent-color, #7c3aed);background:#ffffff14}.feedback-field input::placeholder,.feedback-field textarea::placeholder{color:#fff6}.feedback-field textarea{resize:vertical;min-height:100px}.feedback-type-options{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem}.feedback-type-btn{display:flex;flex-direction:column;align-items:center;gap:.25rem;padding:.75rem .5rem;background:#ffffff0d;border:1px solid rgba(255,255,255,.15);border-radius:8px;color:var(--text-secondary, #aaa);cursor:pointer;font-size:.75rem;transition:all .2s}.feedback-type-btn:hover{background:#ffffff1a;border-color:#ffffff4d}.feedback-type-btn.active{background:#7c3aed33;border-color:var(--accent-color, #7c3aed);color:var(--text-primary, #fff)}@media(max-width:400px){.feedback-type-options{grid-template-columns:repeat(2,1fr)}}.feedback-error{padding:.75rem 1rem;background:#ef444426;border:1px solid rgba(239,68,68,.3);border-radius:8px;color:#ef4444;font-size:.875rem;margin-bottom:1rem}.feedback-actions{display:flex;gap:.75rem;justify-content:flex-end;padding-top:.5rem}.feedback-cancel-btn,.feedback-submit-btn{padding:.75rem 1.5rem;border-radius:8px;font-size:.875rem;font-weight:500;cursor:pointer;transition:all .2s}.feedback-cancel-btn{background:transparent;border:1px solid rgba(255,255,255,.2);color:var(--text-secondary, #aaa)}.feedback-cancel-btn:hover{background:#ffffff0d;border-color:#fff6;color:var(--text-primary, #fff)}.feedback-submit-btn{background:var(--accent-color, #7c3aed);border:none;color:#fff}.feedback-submit-btn:hover:not(:disabled){background:var(--accent-hover, #6d28d9)}.feedback-submit-btn:disabled{opacity:.6;cursor:not-allowed}.feedback-success{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem 1.5rem;text-align:center}.feedback-success svg{color:#10b981;margin-bottom:1rem}.feedback-success p{margin:0;font-size:1.125rem;color:var(--text-primary, #fff)}.puzzle-viewer-container{max-width:1200px;margin:0 auto;padding:.5rem;min-height:100vh;min-height:100dvh}.puzzle-viewer-header{display:flex;flex-direction:column;margin:.5rem .5rem 1rem;padding:.5rem .75rem;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:16px;box-shadow:0 4px 20px #667eea4d}.header-row{display:flex;align-items:center;justify-content:space-between;width:100%;gap:.5rem}.btn-back-icon{width:44px;height:44px;min-width:44px;min-height:44px;border-radius:50%;background:#ffffff26;border:none;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s}.btn-back-icon svg{width:22px;height:22px}.btn-back-icon:hover,.btn-back-icon:active{background:#ffffff40;transform:scale(1.05)}.header-rating{color:#fff;font-size:1rem;font-weight:700;flex:1;text-align:center}.header-status{color:#ffffffe6;font-size:.85rem;font-weight:600;min-width:90px;text-align:right}.header-status-placeholder{min-width:44px}.header-left{display:flex;align-items:center;gap:.75rem}.puzzle-viewer-header h1{margin:0;color:#fff;font-size:1.1rem;font-weight:700}.btn-back{background:#fff3;border:1px solid rgba(255,255,255,.3);color:#fff;padding:.4rem .75rem;border-radius:8px;font-size:.85rem;font-weight:600;cursor:pointer;transition:all .2s;white-space:nowrap}.btn-back:hover{background:#ffffff4d}.puzzle-info{display:flex;align-items:center;gap:.5rem}.puzzle-info .puzzle-rating{background:#fff3;color:#fff;padding:.35rem .7rem;border-radius:20px;font-size:.85rem;font-weight:700}.puzzle-position{color:#ffffffe6;font-size:.8rem;font-weight:600;padding:.35rem .7rem;background:#0003;border-radius:20px}.puzzle-viewer-content{display:flex;flex-direction:column;gap:.75rem;align-items:center}.puzzle-viewer-error{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:300px;text-align:center;gap:1rem;padding:1rem}.puzzle-viewer-error h2{color:#fff;font-size:1.25rem}.puzzle-viewer-error p{color:#fffc;font-size:1rem}.puzzle-viewer-content .action-panel{width:100%;display:flex;flex-direction:column;gap:.75rem;padding:0 .25rem}.puzzle-viewer-content .feedback{padding:.875rem;border-radius:10px;text-align:center;font-weight:600;font-size:.9rem;background:#fff;color:#2c3e50;box-shadow:0 2px 8px #0000001a}.puzzle-viewer-content .feedback-solved{background:linear-gradient(135deg,#28a745,#20c997);color:#fff}.puzzle-viewer-content .feedback-incorrect{background:linear-gradient(135deg,#dc3545,#e83e8c);color:#fff}.puzzle-viewer-content .feedback-showing-solution{background:linear-gradient(135deg,gold,#ffb300);color:#5d4800}.puzzle-viewer-content .controls{display:flex;flex-direction:column;gap:.5rem}.puzzle-viewer-content .controls .btn{padding:.75rem 1rem;border-radius:10px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s}.puzzle-viewer-content .controls .btn-secondary{background:#fff;color:#6c757d;border:2px solid #e0e0e0}.puzzle-viewer-content .controls .btn-secondary:hover{background:#f8f9fa;border-color:#6c757d}.puzzle-viewer-content .controls .btn-solution{background:linear-gradient(135deg,gold,#ffb300);color:#5d4800;border:none;box-shadow:0 2px 8px #ffc1074d}.puzzle-viewer-content .controls .btn-solution:hover{background:linear-gradient(135deg,#ffb300,#ffa000);box-shadow:0 4px 12px #ffc10766}.puzzle-viewer-content .controls .btn-solution:disabled{opacity:.6;cursor:not-allowed}.session-nav{display:flex;gap:.5rem;width:100%}.btn-nav{flex:1;padding:.875rem 1rem;border:none;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-radius:12px;font-size:.95rem;font-weight:600;cursor:pointer;transition:all .2s;box-shadow:0 4px 12px #667eea4d}.btn-nav:hover{transform:translateY(-2px);box-shadow:0 6px 16px #667eea66}.btn-nav:active{transform:translateY(0)}.puzzle-action-bar{position:fixed;bottom:0;left:0;right:0;display:flex;justify-content:space-around;align-items:center;padding:.75rem 1rem;padding-bottom:calc(.75rem + env(safe-area-inset-bottom,0px));background:#1e1e28f2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-top:1px solid rgba(255,255,255,.1);z-index:100}.puzzle-action-btn{display:flex;align-items:center;justify-content:center;width:48px;height:48px;border:none;border-radius:50%;background:#ffffff1f;color:#fffc;cursor:pointer;transition:all .15s ease}.puzzle-action-btn svg{width:24px;height:24px}.puzzle-action-btn:hover{background:#ffffff2e;color:#fff}.puzzle-action-btn:active{background:#ffffff40;color:#fff;transform:scale(.95)}.puzzle-action-btn.puzzle-action-primary{background:linear-gradient(135deg,gold,#ffb300);color:#5d4800}.puzzle-action-btn.puzzle-action-primary:hover{background:linear-gradient(135deg,#ffe033,#ffc933)}.puzzle-action-btn.puzzle-action-primary:active{background:linear-gradient(135deg,#ffb300,#ffa000)}.puzzle-action-btn.puzzle-action-disabled,.puzzle-action-btn:disabled{opacity:.3;cursor:not-allowed}.puzzle-action-btn.puzzle-action-disabled:hover,.puzzle-action-btn:disabled:hover{background:#ffffff1f;color:#fffc;transform:none}.puzzle-viewer-container .desktop-only{display:none}.puzzle-viewer-container .mobile-only{display:flex}.action-panel.desktop-only{flex-direction:column}.puzzle-viewer-container{padding-bottom:80px}@media(min-width:600px){.puzzle-viewer-container .mobile-only{display:none!important}.puzzle-viewer-container .desktop-only{display:flex!important}.puzzle-viewer-container{padding:1rem}.puzzle-viewer-header.desktop-only{flex-direction:row;justify-content:space-between;align-items:center;padding:1rem;margin-bottom:1rem}.puzzle-viewer-header h1{font-size:1.35rem}.btn-back{padding:.5rem 1rem;font-size:.9rem}.puzzle-info .puzzle-rating{font-size:.95rem;padding:.4rem .85rem}.puzzle-position{font-size:.85rem;padding:.4rem .85rem}.puzzle-viewer-content{gap:1rem}.btn-nav{padding:1rem 1.25rem;font-size:1rem}}@media(min-width:900px){.puzzle-viewer-container{padding:1.5rem}.puzzle-viewer-header{padding:1rem 1.5rem;margin-bottom:1.5rem}.puzzle-viewer-header h1{font-size:1.5rem}.puzzle-info .puzzle-rating{font-size:1rem;padding:.5rem 1rem}.puzzle-position{font-size:.9rem;padding:.5rem 1rem}.puzzle-viewer-content{flex-direction:row;align-items:flex-start;justify-content:center;gap:3rem;max-width:1000px;margin:0 auto}.puzzle-viewer-content .board-section{width:auto;flex:0 0 auto}.puzzle-viewer-content .action-panel{width:280px;max-width:280px;padding:0}.puzzle-viewer-content .feedback{padding:1.25rem;font-size:1rem;min-height:80px;display:flex;align-items:center;justify-content:center}.puzzle-viewer-content .controls .btn{padding:.875rem 1.25rem;font-size:.95rem}.session-nav{margin-top:.5rem}.btn-nav{padding:1rem 1.5rem;font-size:1rem}}@media(min-width:1200px){.puzzle-viewer-content{gap:4rem;max-width:1100px}.puzzle-viewer-content .action-panel{width:320px;max-width:320px}.puzzle-viewer-content .feedback{padding:1.5rem;font-size:1.1rem}.btn-nav{padding:1.125rem 1.75rem;font-size:1.05rem}}.session-review-page{max-width:800px;margin:0 auto;padding:.75rem;min-height:100vh;min-height:100dvh}.review-header{display:flex;flex-direction:column;gap:1rem;margin-bottom:1.5rem;text-align:center}.review-header .btn-back.desktop-only{background:#ffffff1a;border:2px solid rgba(255,255,255,.2);color:#fff;padding:.6rem 1rem;border-radius:12px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .3s ease;align-self:flex-start}.review-header .btn-back.desktop-only:hover{background:#fff3;border-color:#ffffff4d}.review-title{text-align:center}.review-title h1{font-size:1.75rem;color:#fff;margin:0;font-weight:700;text-shadow:0 2px 4px rgba(0,0,0,.2)}.review-subtitle{color:#fffc;margin:.5rem 0 0;font-size:1rem;font-weight:500}.review-content{display:flex;flex-direction:column;gap:1.5rem}.review-stats-card{background:#fff;border-radius:16px;padding:1.25rem;box-shadow:0 4px 20px #00000026}.stats-row{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}.stat-item{display:flex;flex-direction:column;align-items:center;gap:.25rem;padding:.75rem;background:#f8f9fa;border-radius:12px}.stat-item .stat-icon{font-size:1.5rem}.stat-item .stat-value{font-size:1.75rem;font-weight:700;color:#2c3e50}.stat-item .stat-label{font-size:.75rem;font-weight:600;color:#6c757d;text-transform:uppercase;letter-spacing:.5px}.review-puzzles-section{background:#fff;border-radius:16px;padding:1.25rem;box-shadow:0 4px 20px #00000026}.review-puzzles-section h2{font-size:1rem;margin:0 0 .25rem;color:#2c3e50;font-weight:600}.section-hint{font-size:.8rem;color:#6c757d;margin:0 0 1rem}.puzzles-grid{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center}.puzzle-card{display:flex;align-items:center;gap:.35rem;padding:.5rem .75rem;border-radius:20px;border:none;cursor:pointer;transition:all .2s ease;font-family:inherit;font-size:.9rem;font-weight:600}.puzzle-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #00000026}.puzzle-card.correct{background:linear-gradient(135deg,#28a745,#20c997)}.puzzle-card.correct:hover{background:linear-gradient(135deg,#218838,#1aa179)}.puzzle-card.incorrect{background:linear-gradient(135deg,#dc3545,#e83e8c)}.puzzle-card.incorrect:hover{background:linear-gradient(135deg,#c82333,#d63384)}.puzzle-card.incomplete{background:linear-gradient(135deg,#ffc107,#fd7e14)}.puzzle-card.incomplete:hover{background:linear-gradient(135deg,#e0a800,#dc6502)}.puzzle-indicator{font-size:1rem;font-weight:700;color:#fff}.puzzle-rating{font-variant-numeric:tabular-nums;color:#fff}.review-actions{display:flex;flex-direction:column;gap:.75rem}.review-actions .btn{padding:1rem;border:none;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s}.review-actions .btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;box-shadow:0 4px 15px #667eea66}.review-actions .btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea80}.guest-signup-prompt{background:linear-gradient(135deg,#667eea,#764ba2);border-radius:16px;padding:1.5rem;text-align:center;color:#fff;box-shadow:0 4px 20px #667eea4d}.prompt-icon{font-size:2.5rem;margin-bottom:.5rem}.guest-signup-prompt h3{margin:0 0 .75rem;font-size:1.25rem;font-weight:700}.prompt-description{margin:0 0 .5rem;font-size:.95rem;opacity:.95;line-height:1.4}.prompt-warning{margin:0 0 1.25rem;font-size:.85rem;opacity:.8;font-style:italic}.prompt-buttons{display:flex;flex-direction:column;gap:.75rem}.prompt-btn{display:flex;align-items:center;justify-content:center;gap:10px;padding:12px 20px;font-size:.95rem;font-weight:600;border:none;border-radius:10px;cursor:pointer;transition:all .2s ease;width:100%}.prompt-btn:hover{transform:translateY(-2px)}.prompt-provider-icon{width:20px;height:20px;object-fit:contain}.prompt-btn-google{background:#fff;color:#333;box-shadow:0 2px 8px #0000001a}.prompt-btn-google:hover{box-shadow:0 4px 12px #00000026}.prompt-btn-lichess{background:#000;color:#fff}.prompt-btn-lichess .prompt-provider-icon{filter:brightness(0) invert(1)}.prompt-btn-lichess:hover{background:#1a1a1a}.prompt-divider{display:flex;align-items:center;margin:1rem 0}.prompt-divider:before,.prompt-divider:after{content:"";flex:1;height:1px;background:#ffffff4d}.prompt-divider span{padding:0 .75rem;font-size:.85rem;opacity:.8}.prompt-btn-continue{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.4)}.prompt-btn-continue:hover{background:#ffffff1a;border-color:#fff9}@media(max-width:600px){.review-header{flex-direction:row;align-items:center;gap:.75rem}.btn-back-icon{width:44px;height:44px;min-width:44px;min-height:44px;border-radius:50%;background:#ffffff26;border:none;padding:0;display:flex;align-items:center;justify-content:center;color:#fff;cursor:pointer;transition:all .3s ease}.btn-back-icon:hover{background:#ffffff40;transform:scale(1.05)}.review-title{flex:1;text-align:left}.review-title h1{font-size:1.5rem}.review-subtitle{font-size:.9rem}}@media(min-width:600px){.session-review-page{padding:1rem}.review-header{flex-direction:row;align-items:center}.review-title{flex:1;text-align:center;margin-right:60px}.review-title h1{font-size:2rem}.stats-row{grid-template-columns:repeat(4,1fr)}.stat-item .stat-icon{font-size:1.75rem}.stat-item .stat-value{font-size:2rem}.stat-item .stat-label{font-size:.8rem}.puzzle-card{padding:.6rem .9rem;font-size:.95rem}}@media(min-width:900px){.session-review-page{padding:1.5rem}.review-title h1{font-size:2.25rem}.review-stats-card{padding:1.5rem}.stat-item{padding:1rem}.stat-item .stat-icon{font-size:2rem}.stat-item .stat-value{font-size:2.25rem}.review-puzzles-section{padding:1.5rem}.puzzle-card{padding:.65rem 1rem;font-size:1rem}}.update-notification{position:fixed;bottom:80px;left:50%;transform:translate(-50%);z-index:10000;animation:slideUp .3s ease-out}@keyframes slideUp{0%{opacity:0;transform:translate(-50%) translateY(20px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.update-notification-content{display:flex;align-items:center;gap:12px;background:linear-gradient(135deg,#1a1a2e,#16213e);border:1px solid rgba(102,126,234,.4);border-radius:12px;padding:12px 16px;box-shadow:0 8px 32px #0006;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.update-notification-icon{font-size:1.5rem;animation:spin 2s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.update-notification-text{display:flex;flex-direction:column;gap:2px}.update-notification-title{font-weight:600;color:#f0c14b;font-size:.9rem}.update-notification-message{color:#fffc;font-size:.8rem}.update-notification-actions{display:flex;gap:8px;margin-left:8px}.update-btn{border:none;border-radius:6px;padding:8px 16px;font-size:.85rem;font-weight:500;cursor:pointer;transition:all .2s ease}.update-btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.update-btn-primary:hover{transform:translateY(-1px);box-shadow:0 4px 12px #667eea66}.update-btn-secondary{background:#ffffff1a;color:#ffffffb3}.update-btn-secondary:hover{background:#ffffff26;color:#fff}@media(max-width:480px){.update-notification{bottom:70px;left:10px;right:10px;transform:none}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.update-notification-content{flex-wrap:wrap;justify-content:center;text-align:center}.update-notification-text{width:100%;order:1;margin-bottom:8px}.update-notification-icon{order:0}.update-notification-actions{order:2;margin-left:0;width:100%;justify-content:center}}.app{width:100%;min-height:100vh}.app-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#1a1a2e,#16213e,#0f3460);color:#fff;gap:1rem}.app-loading .spinner{width:50px;height:50px;border:5px solid rgba(255,255,255,.2);border-top-color:#fff;border-radius:50%;animation:spin 1s linear infinite}.app-loading p{font-size:1.2rem}@keyframes spin{to{transform:rotate(360deg)}}.feedback-button-container{position:fixed;bottom:1.5rem;right:1.5rem;z-index:100;display:flex;flex-direction:column;gap:.75rem;align-items:flex-end}.community-btn{display:flex;align-items:center;gap:.5rem;padding:.625rem 1rem;background:#1a1a2e;border:1px solid rgba(255,69,0,.5);border-radius:10px;color:#ff4500;text-decoration:none;font-size:.875rem;font-weight:500;transition:all .2s ease;box-shadow:0 4px 12px #0000004d,0 0 0 1px #ffffff0d}.community-btn:hover{background:#252542;border-color:#ff4500cc;box-shadow:0 6px 16px #0006,0 0 0 1px #ffffff1a;transform:translateY(-1px);color:#ff6b35}.community-btn svg{flex-shrink:0}@media(max-width:600px){.feedback-button-container,.community-btn{display:none}}.session-review-error{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:50vh;text-align:center;gap:1rem;padding:2rem;color:#fff}.session-review-error h2{font-size:1.5rem;margin:0}.session-review-error p{color:#fffc;margin:0}.session-review-error .btn{margin-top:1rem;padding:.75rem 1.5rem;border:none;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}
