@font-face{font-family:ZCOOL KuaiLe;font-style:normal;font-weight:400;font-display:swap;src:url(/fonts/ZCOOLKuaiLe-Regular.woff2) format("woff2")}@font-face{font-family:Nunito;font-style:normal;font-weight:400 900;font-display:swap;src:url(/fonts/Nunito-Variable.woff2) format("woff2")}:root{--primary: #7CB686;--primary-light: #B4D8BB;--primary-dark: #5A9A66;--primary-glow: rgba(124, 182, 134, .3);--secondary: #F4A97A;--secondary-light: #FCCDB3;--accent: #F7D26B;--accent-light: #FBEAAC;--sky: #A8D8EA;--sky-light: #D0ECFA;--lavender: #C5A3D9;--lavender-light: #E2D3ED;--bg: #FFF8EE;--bg-warm: #FFF3E0;--bg-pattern: #FEF0D8;--card: #FFFDF8;--card-hover: #FFF9F0;--text: #5D4E37;--text-light: #9B8B75;--text-muted: #C4B6A3;--border: #E8DDD0;--border-light: #F0E8DD;--danger: #E88B8B;--danger-light: #FADEDE;--success: #82C9A5;--success-light: #DFF0E7;--cell-bg: #FFFDF8;--cell-prefilled: #F5EFE3;--cell-selected: #D4EDDA;--cell-selected-border: #7CB686;--cell-error: #FADEDE;--cell-hinted: #DFF0E7;--cell-hover: #F5F0E8;--cell-related: #FFF5E6;--cell-same-value: #E5F5E8;--board-border: #C4A882;--board-thick: #A08060;--case-bg: #2C2C2C;--case-inner: #363636;--case-handle: #4A4A4A;--case-grid-line: #444444;--case-grid-thick: #333333;--num-1: #E88B8B;--num-2: #F4A97A;--num-3: #D4A843;--num-4: #7CB686;--num-5: #6BAED6;--num-6: #B898CC;--num-btn-1: #F2A5A5;--num-btn-1-shadow: #D47878;--num-btn-2: #F4B892;--num-btn-2-shadow: #D49570;--num-btn-3: #F0D080;--num-btn-3-shadow: #C8A850;--num-btn-4: #8FC898;--num-btn-4-shadow: #5FA06A;--num-btn-5: #88C4E0;--num-btn-5-shadow: #5EA0C0;--num-btn-6: #C5A8D8;--num-btn-6-shadow: #9A7EB0;--radius: 16px;--radius-sm: 10px;--radius-lg: 24px;--radius-xl: 32px;--radius-full: 9999px;--shadow: 0 2px 12px rgba(93, 78, 55, .08);--shadow-md: 0 4px 20px rgba(93, 78, 55, .1);--shadow-lg: 0 8px 32px rgba(93, 78, 55, .12);--shadow-btn: 0 4px 0 var(--primary-dark);--shadow-inset: inset 0 2px 4px rgba(93, 78, 55, .08);--rank-gold: #FFE082;--rank-gold-bg: linear-gradient(135deg, #FFFDE7, #FFF8E1);--rank-silver: #E0E0E0;--rank-silver-bg: linear-gradient(135deg, #FAFAFA, #F5F5F5);--rank-bronze: #FFCC80;--rank-bronze-bg: linear-gradient(135deg, #FFF3E0, #FFE0B2);--font-display: "ZCOOL KuaiLe", cursive, system-ui;--font-body: "Nunito", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;--font-mono: "SF Mono", "Menlo", monospace}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{font-family:var(--font-body);background:var(--bg);color:var(--text);min-height:100dvh;overscroll-behavior:none;user-select:none;-webkit-user-select:none;font-weight:500;line-height:1.5}#root{min-height:100dvh;padding-top:env(safe-area-inset-top,0px);display:flex;flex-direction:column;position:relative;overflow-x:hidden}button{border:none;cursor:pointer;font-family:var(--font-body);font-weight:700;touch-action:manipulation}input{font-family:var(--font-body);font-weight:600}.back-link{display:inline-block;padding:6px 14px;margin-bottom:8px;color:var(--text);font-size:.85rem;font-weight:700;background:var(--card);border-radius:20px;box-shadow:0 1px 4px #00000014}.back-link:active{transform:scale(.95);opacity:.8}.btn-primary{background:var(--primary);color:#fff;border-radius:var(--radius);font-size:1.15rem;font-weight:800;box-shadow:0 4px 0 var(--primary-dark),var(--shadow);transition:transform .1s,box-shadow .1s;letter-spacing:.5px}.btn-primary:active{transform:translateY(3px);box-shadow:0 1px 0 var(--primary-dark)}.btn-primary:disabled{opacity:.6;transform:none}@keyframes fadeIn{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInScale{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}@keyframes bounceIn{0%{transform:scale(0);opacity:0}50%{transform:scale(1.15)}70%{transform:scale(.95)}to{transform:scale(1);opacity:1}}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}@keyframes gentleBounce{0%,to{transform:translateY(0)}50%{transform:translateY(-3px)}}@keyframes wobble{0%,to{transform:rotate(0)}25%{transform:rotate(-3deg)}75%{transform:rotate(3deg)}}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-3px)}40%{transform:translate(3px)}60%{transform:translate(-2px)}80%{transform:translate(2px)}}@keyframes float{0%,to{transform:translateY(0) rotate(0)}25%{transform:translateY(-8px) rotate(2deg)}75%{transform:translateY(4px) rotate(-1deg)}}@keyframes floatSlow{0%,to{transform:translateY(0)}50%{transform:translateY(-12px)}}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}@keyframes sparkle{0%,to{opacity:0;transform:scale(0) rotate(0)}50%{opacity:1;transform:scale(1) rotate(180deg)}}@keyframes slideUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes slideDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes popIn{0%{transform:scale(0) rotate(-10deg)}60%{transform:scale(1.2) rotate(3deg)}to{transform:scale(1) rotate(0)}}@keyframes wiggle{0%,to{transform:rotate(0)}20%{transform:rotate(8deg)}40%{transform:rotate(-6deg)}60%{transform:rotate(4deg)}80%{transform:rotate(-2deg)}}.animate-fade-in{animation:fadeIn .4s ease-out}.animate-bounce-in{animation:bounceIn .5s cubic-bezier(.34,1.56,.64,1)}.animate-bounce{animation:bounce .4s ease-out}.animate-shake{animation:shake .35s ease-out}.animate-wobble{animation:wobble .5s ease-out}.animate-pop-in{animation:popIn .4s cubic-bezier(.34,1.56,.64,1)}.animate-float{animation:float 2.5s ease-in-out infinite}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}.loading-spinner{display:flex;align-items:center;justify-content:center;flex:1;flex-direction:column;gap:16px}.loading-spinner .loading-dots{display:flex;gap:8px}.loading-spinner .loading-dot{width:12px;height:12px;border-radius:50%;animation:bounce .6s ease-in-out infinite}.loading-spinner .loading-dot:nth-child(1){background:var(--primary);animation-delay:0s}.loading-spinner .loading-dot:nth-child(2){background:var(--secondary);animation-delay:.15s}.loading-spinner .loading-dot:nth-child(3){background:var(--accent);animation-delay:.3s}.pwa-banner{position:fixed;bottom:0;left:0;right:0;z-index:9999;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;padding-bottom:calc(14px + env(safe-area-inset-bottom,0px));background:var(--card);border-top:3px solid var(--primary-light);box-shadow:0 -4px 20px #00000014;animation:pwa-slide-up .4s ease-out}@keyframes pwa-slide-up{0%{transform:translateY(100%)}to{transform:translateY(0)}}.pwa-banner-content{display:flex;align-items:center;gap:10px;flex:1;min-width:0}.pwa-banner-icon{font-size:1.8rem;flex-shrink:0}.pwa-banner-text{min-width:0}.pwa-banner-title{font-family:var(--font-display);font-size:.95rem;color:var(--text);font-weight:700;line-height:1.3}.pwa-banner-hint{font-size:.78rem;color:var(--text-light);margin-top:2px;line-height:1.4}.pwa-share-icon{display:inline-block;color:var(--sky);font-weight:700}.pwa-banner-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}.pwa-btn-install{padding:8px 14px;border-radius:var(--radius);background:var(--primary);color:#fff;font-size:.85rem;font-weight:700;font-family:var(--font-display);white-space:nowrap;transition:transform .15s,background .2s}.pwa-btn-install:active{transform:scale(.95);background:var(--primary-dark)}.pwa-btn-close{width:28px;height:28px;border-radius:50%;background:var(--border);color:var(--text-light);font-size:.75rem;display:flex;align-items:center;justify-content:center;transition:background .2s}.pwa-btn-close:active{background:var(--text-muted)}.pwa-update-bar{position:fixed;top:env(safe-area-inset-top,0px);left:0;right:0;z-index:9999;display:flex;align-items:center;justify-content:center;gap:12px;padding:10px 16px;background:var(--primary-dark);color:#fff;font-size:.9rem;font-weight:700;animation:slideDown .3s ease-out;box-shadow:0 4px 12px #0003}.pwa-update-text{font-size:.88rem}.pwa-update-btn{padding:6px 16px;background:#fff;color:var(--primary-dark);border-radius:var(--radius-full);font-size:.85rem;font-weight:800;border:none;transition:transform .15s}.pwa-update-btn:active{transform:scale(.94)}.mascot-container{display:flex;flex-direction:column;align-items:center;gap:4px}.mascot-character{animation:float 4s ease-in-out infinite;filter:drop-shadow(0 4px 8px rgba(93,78,55,.15))}.mascot-character svg{width:100%;height:100%}.mascot-happy{animation:float 4s ease-in-out infinite}.mascot-thinking{animation:float 5s ease-in-out infinite}.mascot-thinking svg{transform:rotate(-5deg)}.mascot-celebrating{animation:bounce .6s ease-in-out infinite}.mascot-waving{animation:wobble 1s ease-in-out infinite}.wing-up{animation:wiggle .6s ease-in-out infinite;transform-origin:center bottom}.celebrate-star{animation:twinkle .8s ease-in-out infinite}@keyframes twinkle{0%,to{opacity:.3;r:2}50%{opacity:1;r:3.5}}@keyframes wiggle{0%,to{transform:rotate(0)}25%{transform:rotate(8deg)}75%{transform:rotate(-8deg)}}.mascot-speech-bubble{position:relative;background:#fff;border-radius:20px;padding:8px 16px;font-size:.85rem;font-weight:700;color:var(--text);box-shadow:0 2px 8px #5d4e371a;max-width:200px;text-align:center;animation:fadeIn .3s ease-out}.mascot-speech-bubble:before{content:"";position:absolute;top:-8px;left:50%;transform:translate(-50%);width:0;height:0;border-left:8px solid transparent;border-right:8px solid transparent;border-bottom:10px solid white}.home-page{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px 16px;position:relative;overflow:hidden}.home-content{display:flex;flex-direction:column;align-items:center;width:100%;max-width:380px}.home-hero{text-align:center;margin-bottom:28px}.home-title{font-family:var(--font-display);font-size:2rem;color:var(--primary-dark);margin-top:8px;letter-spacing:2px}.home-subtitle{color:var(--text-light);font-size:.9rem;margin-top:4px;font-weight:600}.home-form{width:100%;display:flex;flex-direction:column;gap:14px}.form-group{display:flex;flex-direction:column;gap:6px}.form-label{font-size:.85rem;font-weight:700;color:var(--text);padding-left:4px}.form-input{padding:14px 16px;border:3px solid var(--border);border-radius:var(--radius);font-size:1.05rem;background:var(--card);color:var(--text);outline:none;transition:border-color .25s,box-shadow .25s,transform .15s;text-align:center;letter-spacing:2px;font-weight:700;box-shadow:var(--shadow-inset)}.form-input:focus{border-color:var(--primary);box-shadow:0 0 0 4px var(--primary-glow),var(--shadow-inset);transform:scale(1.02)}.form-input.prefilled{border-color:var(--success);animation:prefillGlow 1.5s ease-out}@keyframes prefillGlow{0%{box-shadow:0 0 0 6px #82c9a566}to{box-shadow:none}}.form-input::placeholder{letter-spacing:0;color:var(--text-muted);font-weight:500}.form-error{color:var(--danger);font-size:.875rem;text-align:center;font-weight:700;animation:shake .35s ease-out}.home-btn{padding:16px;font-size:1.1rem;margin-top:4px;letter-spacing:1px}.teacher-link{margin-top:24px;background:none;color:var(--text-light);font-size:.85rem;font-weight:600;opacity:.6;transition:opacity .2s}.teacher-link:active{opacity:1}.game-page{padding:16px;max-width:560px;margin:0 auto;flex:1;display:flex;flex-direction:column}.game-page-content{width:100%;flex:1;display:flex;flex-direction:column;justify-content:center;animation:fadeIn .3s ease-out}.select-case{background:var(--case-bg);border-radius:20px;box-shadow:0 12px 40px #00000059,0 2px 8px #0003,inset 0 1px #ffffff14;overflow:hidden;border-right:4px solid #4DB6AC}.select-case-handle{display:flex;justify-content:center;padding:10px 0 6px}.select-handle-grip{width:64px;height:8px;border-radius:4px;background:var(--case-handle);box-shadow:inset 0 1px 2px #0000004d,0 1px #ffffff0f}.preview-board-wrap{padding:6px 16px 12px;display:flex;justify-content:center}.preview-board{display:grid;gap:0;width:min(72vw,360px);aspect-ratio:1;background:#444;border-radius:8px;overflow:hidden;box-shadow:inset 0 1px #ffffff14,0 2px 8px #0000004d}.preview-cell{background:#fff;border:1.5px solid #B0B0B0;transition:background .3s}.preview-cell.alt{background:#c5e1c0}.preview-cell.thick-right{border-right:4px solid #222}.preview-cell.thick-bottom{border-bottom:4px solid #222}.select-hinge{display:flex;align-items:center;padding:0 16px;height:14px}.select-hinge-dot{width:8px;height:8px;border-radius:50%;background:var(--case-handle);box-shadow:inset 0 1px 2px #0006;flex-shrink:0}.select-hinge-line{flex:1;height:2px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.1) 20%,rgba(255,255,255,.1) 80%,transparent);margin:0 6px}.select-tray{background:#00000026;border-top:1px solid rgba(255,255,255,.05);padding:14px 16px 18px}.select-tray-hint{text-align:center;color:#ffffff73;font-size:.8rem;margin-bottom:10px}.difficulty-tiles{display:flex;gap:10px;justify-content:center}.difficulty-tile{flex:1;max-width:120px;display:flex;flex-direction:column;align-items:center;gap:4px;padding:14px 8px 12px;background:linear-gradient(180deg,#fafaf8,#edece8);border:1px solid #D0CFC8;border-radius:10px;box-shadow:0 3px #b8b7b0,0 5px 12px #0003;transition:transform .12s,box-shadow .12s}.difficulty-tile:active{transform:translateY(3px);box-shadow:0 0 #b8b7b0,0 1px 4px #00000026}.tile-icon{font-size:1.5rem;line-height:1}.tile-label{font-family:var(--font-display);font-size:1rem;color:#333}.tile-desc{font-size:.7rem;color:#999;line-height:1.2}.grid-size-buttons{display:flex;gap:12px;margin-top:16px}.grid-size-btn{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;padding:16px 12px;background:var(--card);border:3px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);transition:transform .15s,border-color .2s,box-shadow .2s}.grid-size-btn.active{border-color:var(--primary);background:linear-gradient(135deg,#f0faf2,#e8f5e9);box-shadow:0 4px 16px var(--primary-glow),var(--shadow)}.grid-size-btn:active{transform:scale(.96)}.grid-size-num{font-family:var(--font-display);font-size:1.6rem;color:var(--text);line-height:1}.grid-size-btn.active .grid-size-num{color:var(--primary-dark)}.grid-size-desc{font-size:.8rem;color:var(--text-light);font-weight:600}.board-wrapper{position:relative;padding:6px;border-radius:12px;background:var(--case-bg);box-shadow:inset 0 1px #ffffff14,0 2px 8px #0000004d}.sudoku-board{display:grid;gap:0;width:min(88vw,480px);aspect-ratio:1;background:var(--case-grid-line);border-radius:6px;overflow:hidden}.sudoku-cell{display:flex;align-items:center;justify-content:center;background:#fff;border:1.5px solid #B0B0B0;cursor:pointer;transition:background .15s;position:relative;min-width:0;min-height:0}.sudoku-cell:active{transform:scale(.94)}.sudoku-cell.alt-box{background:#c5e1c0}.sudoku-cell.thick-right{border-right:4px solid #222}.sudoku-cell.thick-bottom{border-bottom:4px solid #222}.cell-value{font-family:var(--font-display);font-size:clamp(1.6rem,8vw,2.8rem);line-height:1;transition:transform .2s cubic-bezier(.34,1.56,.64,1)}.sudoku-cell.prefilled .cell-value{color:#1a1a1a;font-weight:900}.cell-value.user-input{color:#d32f2f;animation:popIn .25s cubic-bezier(.34,1.56,.64,1)}.num-color-1,.num-color-2,.num-color-3,.num-color-4,.num-color-5,.num-color-6{color:inherit}.sudoku-cell.selected{background:#bbdefb;box-shadow:inset 0 0 0 2.5px #42a5f5;z-index:1}.sudoku-cell.related{background:#fff8e1}.sudoku-cell.alt-box.related{background:#f0edd0}.sudoku-cell.same-value{background:#e3f2fd}.sudoku-cell.alt-box.same-value{background:#d0e8f0}.sudoku-cell.conflict{background:#ffcdd2}.sudoku-cell.conflict .cell-value{color:#c62828}.sudoku-cell.hinted{background:#dcedc8}.sudoku-cell.hinted .cell-value{color:#33691e}.number-pad{padding:14px 10px 10px}.number-buttons{display:flex;gap:8px;justify-content:center}.num-btn{width:clamp(48px,12.5vw,68px);height:clamp(52px,13.5vw,72px);border-radius:8px;background:linear-gradient(180deg,#fafaf8,#edece8);color:#333;font-size:clamp(1.3rem,5vw,2rem);display:flex;align-items:center;justify-content:center;border:1px solid #D0CFC8;box-shadow:0 3px #b8b7b0,0 4px 8px #00000026;transition:transform .1s,box-shadow .1s,border-color .15s;position:relative}.num-value{font-family:var(--font-display);font-weight:900;line-height:1;color:#2c2c2c;text-shadow:none}.num-btn.active{border-color:#42a5f5;box-shadow:0 2px #1e88e5,0 3px 12px #42a5f559;background:linear-gradient(180deg,#e3f2fd,#bbdefb);transform:translateY(1px)}.num-btn:active:not(:disabled){transform:translateY(3px);box-shadow:0 0 #b8b7b0,0 1px 2px #0000001a}.num-btn:disabled{opacity:.35;transform:none}.num-btn-1 .num-value{color:var(--num-1)}.num-btn-2 .num-value{color:var(--num-2)}.num-btn-3 .num-value{color:var(--num-3)}.num-btn-4 .num-value{color:var(--num-4)}.num-btn-5 .num-value{color:var(--num-5)}.num-btn-6 .num-value{color:var(--num-6)}.num-btn.active .num-value{color:#1565c0}.timer{display:flex;align-items:center;gap:6px;padding:6px 14px;background:var(--card);border-radius:var(--radius-full);border:2px solid var(--border);box-shadow:var(--shadow)}.timer-clock{font-size:1rem;animation:pulse 2s ease-in-out infinite}.timer-value{font-family:var(--font-display);font-size:1.15rem;color:var(--text);font-variant-numeric:tabular-nums;letter-spacing:1px}.celebration-overlay{position:fixed;inset:0;background:#5d4e3773;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center;z-index:100;opacity:0;transition:opacity .4s;padding:20px}.celebration-overlay.visible{opacity:1}.confetti-container{position:fixed;inset:0;pointer-events:none;overflow:hidden}.confetti-piece{position:absolute;top:55%;animation:confetti-fall 2s ease-out forwards}.celebration-card{background:linear-gradient(160deg,#fffdf8,#fff8ee);border-radius:var(--radius-xl);padding:20px 20px 24px;text-align:center;box-shadow:0 8px #5d4e3714,0 16px 40px #5d4e3733;animation:bounceIn .6s cubic-bezier(.34,1.56,.64,1);max-width:340px;width:100%;position:relative;z-index:1;border:3px solid var(--border-light)}.celebration-mascot{margin-bottom:4px}.celebration-stars{font-size:2.2rem;margin-bottom:8px;display:flex;justify-content:center;gap:8px}.cele-star{display:inline-block;filter:grayscale(1) opacity(.2);transition:filter .3s,transform .3s}.cele-star.active{filter:none;animation:starPop .5s cubic-bezier(.34,1.56,.64,1) backwards}.celebration-title{font-family:var(--font-display);font-size:1.35rem;color:var(--text);margin-bottom:16px;line-height:1.4;animation:fadeIn .4s ease-out .5s backwards}.celebration-stats{display:flex;justify-content:center;align-items:center;gap:20px;margin-bottom:20px;padding:12px 16px;background:var(--bg);border-radius:var(--radius);animation:fadeIn .4s ease-out .6s backwards}.cele-stat{display:flex;flex-direction:column;align-items:center;gap:2px}.cele-stat-value{font-family:var(--font-body);font-size:1.3rem;font-weight:800;color:var(--text);font-variant-numeric:tabular-nums}.cele-stat-label{font-size:.75rem;color:var(--text-light);font-weight:700}.cele-stat-divider{width:2px;height:36px;background:var(--border);border-radius:1px}.celebration-actions{display:flex;gap:10px;animation:fadeIn .4s ease-out .7s backwards}.cele-btn{flex:1;padding:14px 8px;border-radius:var(--radius);font-family:var(--font-display);font-size:1.05rem;font-weight:800;border:3px solid var(--border);background:var(--card);color:var(--text);box-shadow:0 3px #5d4e371a;transition:transform .12s,box-shadow .12s}.cele-btn:active{transform:translateY(2px);box-shadow:0 1px #5d4e371a}.cele-btn-again{background:var(--primary);color:#fff;border-color:var(--primary-dark);box-shadow:0 3px 0 var(--primary-dark)}.cele-btn-back{background:var(--card);color:var(--text)}.gameplay-page{padding:8px 12px 16px;max-width:560px;margin:0 auto;flex:1;display:flex;flex-direction:column;align-items:stretch;position:relative}.gameplay-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;animation:fadeIn .3s ease-out}.back-btn{display:flex;align-items:center;gap:4px;background:var(--card);color:var(--text);font-size:.9rem;font-weight:700;padding:6px 12px;border-radius:var(--radius-full);border:2px solid var(--border);transition:transform .15s}.back-btn:active{transform:scale(.94)}.back-arrow{font-size:1.1rem}.back-text{font-size:.85rem}.gameplay-info{display:flex;gap:6px}.gameplay-badge{font-size:.78rem;font-weight:800;padding:4px 10px;border-radius:var(--radius-full);line-height:1.3}.badge-grid{background:var(--primary-light);color:var(--primary-dark)}.badge-diff{background:var(--accent-light);color:#8b6914}.board-case{display:flex;flex-direction:column;background:var(--case-bg);border-radius:20px;box-shadow:0 12px 40px #00000059,0 2px 8px #0003,inset 0 1px #ffffff14;overflow:hidden;animation:fadeInScale .4s ease-out;border-right:4px solid #4DB6AC}.case-handle{display:flex;justify-content:center;padding:8px 0 4px}.case-handle-grip{width:64px;height:8px;border-radius:4px;background:var(--case-handle);box-shadow:inset 0 1px 2px #0000004d,0 1px #ffffff0f}.case-board-section{display:flex;align-items:center;justify-content:center;padding:2px 10px 6px}.case-hinge{display:flex;align-items:center;gap:0;padding:0 16px;height:12px}.hinge-dot{width:8px;height:8px;border-radius:50%;background:var(--case-handle);box-shadow:inset 0 1px 2px #0006;flex-shrink:0}.hinge-line{flex:1;height:2px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.1) 20%,rgba(255,255,255,.1) 80%,transparent);margin:0 6px}.case-tray-section{background:#00000026;border-top:1px solid rgba(255,255,255,.05)}.game-actions{display:flex;gap:12px;margin-top:12px;animation:fadeIn .4s ease-out .2s backwards}.game-action-btn{flex:1;padding:16px 12px;border-radius:var(--radius-lg);font-family:var(--font-display);font-size:1.15rem;font-weight:800;border:3px solid var(--border);background:var(--card);color:var(--text);box-shadow:var(--shadow);transition:transform .15s,border-color .2s,background .2s}.game-action-btn:active:not(:disabled){transform:scale(.96)}.game-action-btn:disabled{opacity:.35}.erase-action{border-color:var(--danger-light);color:var(--danger)}.erase-action:active:not(:disabled){background:var(--danger-light)}.erase-action.active{background:var(--danger-light);border-color:var(--danger)}.hint-action{border-color:var(--accent-light);color:#8b6914}.hint-action:active:not(:disabled){background:var(--accent-light)}.leaderboard-page{flex:1;display:flex;flex-direction:column;padding:12px 16px 24px;max-width:560px;margin:0 auto;width:100%}.lb-header{text-align:center;margin-bottom:12px;animation:fadeIn .4s ease-out}.lb-title{font-family:var(--font-display);font-size:1.5rem;color:var(--text)}.lb-class{font-size:.82rem;color:var(--text-light);margin-top:2px;font-weight:600}.mode-tabs{display:flex;gap:0;background:var(--card);border-radius:var(--radius-full);padding:3px;margin-bottom:8px;border:2px solid var(--border);animation:fadeIn .4s ease-out}.mode-tab{flex:1;padding:8px 4px;border-radius:var(--radius-full);background:transparent;color:var(--text-light);font-size:.9rem;font-weight:700;transition:background .25s,color .25s,transform .15s;display:flex;align-items:center;justify-content:center;gap:4px}.mode-tab.active{background:var(--primary);color:#fff;box-shadow:0 2px 8px var(--primary-glow)}.mode-tab:active{transform:scale(.96)}.puzzle-selector{display:flex;flex-direction:column;gap:6px;margin-bottom:8px;animation:fadeIn .3s ease-out}.selector-row{display:flex;gap:0;background:var(--card);border-radius:var(--radius-full);padding:3px;border:2px solid var(--border)}.selector-btn{flex:1;padding:6px 4px;border-radius:var(--radius-full);background:transparent;color:var(--text-light);font-size:.8rem;font-weight:700;transition:background .25s,color .25s;display:flex;align-items:center;justify-content:center}.selector-btn.active{background:var(--secondary);color:#fff}.selector-btn:active{transform:scale(.96)}.rank-time{font-family:monospace;letter-spacing:1px}.period-tabs{display:flex;gap:0;background:var(--card);border-radius:var(--radius-full);padding:3px;margin-bottom:12px;border:2px solid var(--border);animation:fadeIn .4s ease-out .1s backwards}.period-tab{flex:1;padding:7px 4px;border-radius:var(--radius-full);background:transparent;color:var(--text-light);font-size:.85rem;font-weight:700;transition:background .25s,color .25s,transform .15s;display:flex;align-items:center;justify-content:center;gap:4px}.period-tab.active{background:var(--primary);color:#fff;box-shadow:0 2px 8px var(--primary-glow)}.period-tab:active{transform:scale(.96)}.lb-loading{flex:1;display:flex;justify-content:center;align-items:center}.lb-empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:16px;animation:fadeIn .4s ease-out}.lb-empty-icon{font-size:3rem;display:block;margin-bottom:12px;animation:float 4s ease-in-out infinite}.lb-empty-text{font-family:var(--font-display);font-size:1.1rem;color:var(--text);margin-bottom:4px}.lb-empty-hint{font-size:.85rem;color:var(--text-light)}.rankings-list{flex:1;display:flex;flex-direction:column;gap:8px;overflow-y:auto;-webkit-overflow-scrolling:touch}.rank-item{display:flex;align-items:center;gap:10px;padding:14px;background:var(--card);border-radius:var(--radius);border:2px solid transparent;transition:transform .15s;animation:slideUp .4s ease-out backwards}.rank-item:active{transform:scale(.98)}.rank-item.is-me{border-color:var(--primary-light);background:linear-gradient(135deg,#f0faf2,#e8f5e9)}.rank-item.rank-gold{background:var(--rank-gold-bg);border-color:var(--rank-gold);box-shadow:0 3px 12px #ffc10726}.rank-item.rank-silver{background:var(--rank-silver-bg);border-color:var(--rank-silver);box-shadow:0 3px 12px #0000000f}.rank-item.rank-bronze{background:var(--rank-bronze-bg);border-color:var(--rank-bronze);box-shadow:0 3px 12px #ff98001a}.rank-position{width:36px;text-align:center;flex-shrink:0}.rank-medal{font-size:1.5rem}.rank-number{font-family:var(--font-display);font-size:1.1rem;color:var(--text-light)}.rank-avatar{width:42px;height:42px;flex-shrink:0}.avatar-img{width:100%;height:100%;border-radius:50%;object-fit:cover;border:2px solid var(--border-light)}.avatar-placeholder{width:100%;height:100%;border-radius:50%;background:linear-gradient(135deg,var(--primary-light),var(--sky-light));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.1rem;font-family:var(--font-display)}.rank-info{flex:1;display:flex;flex-direction:column;gap:2px;min-width:0}.rank-name{font-weight:700;font-size:.95rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;display:flex;align-items:center;gap:6px}.me-tag{font-size:.65rem;background:var(--primary);color:#fff;padding:1px 6px;border-radius:var(--radius-full);font-weight:800}.rank-games{font-size:.75rem;color:var(--text-light)}.rank-score{display:flex;align-items:baseline;gap:2px;min-width:50px;justify-content:flex-end}.rank-score-value{font-family:var(--font-body);font-size:1.15rem;font-weight:800;color:var(--primary-dark);font-variant-numeric:tabular-nums}.rank-score-label{font-size:.7rem;color:var(--text-light);font-weight:700}.profile-page{flex:1;display:flex;flex-direction:column;padding:12px 16px 24px;max-width:560px;margin:0 auto;width:100%}.profile-card{background:var(--card);border-radius:var(--radius-xl);padding:24px 20px 16px;text-align:center;box-shadow:0 4px #5d4e370f,var(--shadow-md);margin-bottom:12px;border:2px solid var(--border-light);animation:fadeIn .3s ease-out}.profile-card-header{margin-bottom:16px}.profile-avatar-section{position:relative;display:inline-block;cursor:pointer;margin-bottom:8px}.profile-avatar-img{width:72px;height:72px;border-radius:50%;object-fit:cover;border:4px solid var(--primary-light);box-shadow:0 4px 16px var(--primary-glow)}.profile-avatar-placeholder{width:72px;height:72px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff;display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-size:2rem;box-shadow:0 4px 16px var(--primary-glow)}.avatar-edit-badge{position:absolute;bottom:-2px;right:-2px;width:26px;height:26px;border-radius:50%;background:var(--card);border:2px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:.75rem;box-shadow:var(--shadow)}.profile-name{font-family:var(--font-display);font-size:1.4rem;color:var(--text);margin-bottom:2px}.profile-class{font-size:.82rem;color:var(--text-light);font-weight:600}.profile-stats{display:flex;justify-content:center;align-items:stretch;gap:0;background:var(--bg);border-radius:var(--radius-lg);overflow:hidden}.profile-stat{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:14px 8px}.profile-stat-value{font-family:var(--font-display);font-size:1.4rem;font-weight:800;color:var(--text);line-height:1}.profile-stat-label{font-size:.72rem;color:var(--text-light);font-weight:700}.stat-divider{width:2px;background:var(--border);border-radius:1px;margin:10px 0}.profile-section{margin-bottom:12px;animation:fadeIn .4s ease-out .1s backwards}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;padding:0 4px}.section-title{font-family:var(--font-display);font-size:1rem;color:var(--text)}.section-link{background:none;color:var(--primary);font-size:.8rem;font-weight:700}.section-link:active{opacity:.6}.top-ranks-list{display:flex;flex-direction:column;gap:6px}.top-rank-row{display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--card);border-radius:var(--radius);border:2px solid var(--border-light)}.top-rank-row.is-me{border-color:var(--primary-light);background:linear-gradient(135deg,#f0faf2,#e8f5e9)}.top-rank-pos{width:28px;text-align:center;font-size:1.2rem;flex-shrink:0}.rank-num{font-family:var(--font-display);font-size:1rem;color:var(--text-light)}.top-rank-name{flex:1;font-size:.92rem;font-weight:700;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.top-rank-score{font-size:.85rem;font-weight:800;color:var(--primary-dark);font-variant-numeric:tabular-nums}.start-game-btn{width:100%;padding:18px;background:var(--primary);color:#fff;border-radius:var(--radius-lg);font-family:var(--font-display);font-size:1.4rem;letter-spacing:2px;box-shadow:0 6px 0 var(--primary-dark),0 8px 20px var(--primary-glow);transition:transform .12s,box-shadow .12s;margin-bottom:16px;animation:fadeIn .4s ease-out .2s backwards}.start-game-btn:active{transform:translateY(4px);box-shadow:0 2px 0 var(--primary-dark),0 4px 8px var(--primary-glow)}.logout-link{display:block;text-align:center;padding:12px 0 4px;color:var(--text-secondary, #999);font-size:.8rem;cursor:pointer;margin-top:8px}.logout-link.confirming{color:var(--danger)}.teacher-page{padding:16px 16px 32px;max-width:560px;margin:0 auto}.teacher-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.logout-link{background:none;color:var(--danger);font-size:.875rem;font-weight:600}.teacher-greeting{color:var(--text-light);margin-bottom:16px}.create-class-section{margin-bottom:20px}.create-form{display:flex;gap:8px}.create-form .form-input{flex:1;text-align:left;letter-spacing:0}.create-btn{padding:12px 16px;border-radius:var(--radius);white-space:nowrap;font-size:1rem}.create-btn:disabled{opacity:.5}.classes-section{margin-bottom:20px}.class-list{display:flex;flex-direction:column;gap:8px}.class-card{display:flex;justify-content:space-between;align-items:center;padding:14px 12px;background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);cursor:pointer;transition:transform .15s;border:2px solid transparent}.class-card:active{transform:scale(.98)}.class-info{display:flex;align-items:center;gap:8px;min-width:0;flex:1}.class-card-name{font-size:1rem;font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.class-meta{font-size:.78rem;color:var(--text-light);white-space:nowrap;flex-shrink:0}.class-card-right{display:flex;align-items:center;gap:8px;flex-shrink:0;margin-left:8px}.code-value{font-size:.85rem;font-weight:700;font-family:monospace;color:var(--primary);letter-spacing:1px}.card-arrow{font-size:1.3rem;color:var(--text-muted);font-weight:300;line-height:1}.detail-header{display:flex;align-items:center;gap:10px;margin-bottom:16px;flex-wrap:wrap}.detail-back-btn{background:none;color:var(--primary);font-weight:700;font-size:.9rem;padding:4px 0;flex-shrink:0}.detail-back-btn:active{opacity:.7}.detail-class-meta{flex:1;min-width:0;display:flex;align-items:center;gap:8px}.detail-class-name{font-size:1.15rem;font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.detail-class-code{font-size:.8rem;font-weight:700;font-family:monospace;color:var(--primary);background:var(--primary-light);padding:2px 8px;border-radius:var(--radius-sm);letter-spacing:1px;flex-shrink:0}.detail-header-actions{display:flex;align-items:center;gap:6px;flex-shrink:0}.detail-tabs{display:flex;background:var(--bg);border-radius:var(--radius-full);padding:3px;margin-bottom:12px;border:2px solid var(--border)}.detail-tab{flex:1;padding:8px;border-radius:var(--radius-full);background:transparent;color:var(--text-light);font-size:.85rem;font-weight:700;transition:background .2s,color .2s;text-align:center;cursor:pointer}.detail-tab.active{background:var(--primary);color:#fff;box-shadow:0 2px 8px var(--primary-glow)}.detail-tab:active{transform:scale(.96)}.detail-loading,.detail-empty{text-align:center;padding:32px;color:var(--text-light);font-size:.9rem}.member-list{display:flex;flex-direction:column;gap:6px}.member-item{display:flex;align-items:center;gap:10px;padding:10px 12px;background:var(--bg);border-radius:var(--radius-sm)}.action-btn{display:flex;align-items:center;gap:2px;padding:4px 10px;border-radius:var(--radius-sm);font-size:.75rem;font-weight:700;background:var(--primary-light);color:var(--primary-dark);transition:transform .15s,background .15s;white-space:nowrap}.action-btn:active{transform:scale(.93);background:var(--primary);color:#fff}.share-btn{background:var(--primary);color:#fff;padding:6px 12px;font-size:.78rem;box-shadow:0 2px 8px var(--primary-glow)}.share-btn:active{background:var(--primary-dark)}.delete-class-btn{background:none;color:var(--danger);font-size:.75rem;font-weight:600;padding:4px 8px;border-radius:var(--radius-sm);opacity:.7;transition:opacity .2s}.delete-class-btn:hover{opacity:1}.delete-class-btn:disabled{opacity:.4}.toast-notification{position:fixed;bottom:80px;left:50%;transform:translate(-50%);background:var(--text);color:var(--card);padding:10px 20px;border-radius:var(--radius-full);font-size:.85rem;font-weight:700;box-shadow:var(--shadow-md);z-index:1000;animation:toastIn .3s ease-out;pointer-events:none}@keyframes toastIn{0%{opacity:0;transform:translate(-50%) translateY(16px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.admin-login-page{flex:1;display:flex;align-items:center;justify-content:center;padding:20px;background:var(--bg)}.admin-login-card{width:100%;max-width:380px;background:var(--card);border-radius:var(--radius-lg);padding:32px 24px;box-shadow:var(--shadow-md);border:2px solid var(--border-light);animation:fadeIn .4s ease-out}.admin-login-header{text-align:center;margin-bottom:24px}.admin-icon{font-size:2.5rem;display:block;margin-bottom:8px}.admin-login-header h1{font-family:var(--font-display);font-size:1.6rem;color:var(--text)}.admin-input{width:100%;padding:14px 16px;border:3px solid var(--border);border-radius:var(--radius);font-size:1.05rem;background:var(--bg);color:var(--text);outline:none;text-align:center;font-weight:700;letter-spacing:4px;transition:border-color .2s;box-shadow:var(--shadow-inset)}.admin-input:focus{border-color:var(--primary)}.admin-error{color:var(--danger);font-size:.85rem;text-align:center;margin-top:10px;font-weight:700}.admin-submit{width:100%;padding:14px;margin-top:16px;font-size:1.1rem}.admin-back{display:block;width:100%;margin-top:16px;background:none;color:var(--text-light);font-size:.85rem;font-weight:600;text-align:center}.admin-page{flex:1;background:var(--bg);max-width:800px;margin:0 auto;padding:16px}.admin-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.admin-title{font-family:var(--font-display);font-size:1.4rem;color:var(--text)}.admin-logout{background:none;color:var(--danger);font-size:.9rem;font-weight:700}.admin-tabs{display:flex;gap:0;background:var(--card);border-radius:var(--radius);padding:4px;margin-bottom:16px;border:2px solid var(--border-light);overflow-x:auto;-webkit-overflow-scrolling:touch}.admin-tab{flex:1;padding:8px 6px;border-radius:var(--radius-sm);background:transparent;color:var(--text-light);font-size:.78rem;font-weight:700;white-space:nowrap;transition:background .2s,color .2s}.admin-tab.active{background:var(--primary);color:#fff}.admin-loading{text-align:center;color:var(--text-light);padding:40px;font-weight:600}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.stat-card{background:var(--card);border-radius:var(--radius);padding:16px 12px;text-align:center;display:flex;flex-direction:column;gap:4px;border:2px solid var(--border-light);animation:fadeIn .3s ease-out backwards}.stat-card:nth-child(2){animation-delay:.05s}.stat-card:nth-child(3){animation-delay:.1s}.stat-card:nth-child(4){animation-delay:.15s}.stat-card:nth-child(5){animation-delay:.2s}.stat-card:nth-child(6){animation-delay:.25s}.stat-card.highlight{border-color:var(--primary-light);background:linear-gradient(135deg,#F0FAF2,var(--card))}.stat-card-icon{font-size:1.3rem}.stat-card-value{font-family:var(--font-display);font-size:1.6rem;color:var(--text)}.stat-card-label{font-size:.75rem;color:var(--text-light);font-weight:700}.admin-table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:var(--radius);border:2px solid var(--border-light);background:var(--card);animation:fadeIn .3s ease-out}.admin-table{width:100%;border-collapse:collapse;font-size:.85rem}.admin-table th{background:var(--bg);padding:10px 12px;text-align:left;font-weight:800;color:var(--text-light);font-size:.78rem;text-transform:uppercase;letter-spacing:.5px;white-space:nowrap;border-bottom:2px solid var(--border)}.admin-table td{padding:10px 12px;border-bottom:1px solid var(--border-light);color:var(--text);font-weight:600}.admin-table tbody tr:last-child td{border-bottom:none}.td-name{font-weight:800}.td-code{font-family:var(--font-mono);font-size:.85rem;color:var(--primary-dark);letter-spacing:2px;font-weight:800}.td-score{font-family:var(--font-display);color:var(--primary-dark)}.td-time{color:var(--text-light);font-size:.8rem}.td-empty{text-align:center;color:var(--text-muted);padding:32px 12px!important}.status-badge{display:inline-block;padding:2px 8px;border-radius:var(--radius-full);font-size:.72rem;font-weight:800}.status-badge.completed{background:var(--success-light);color:#2e7d4f}.status-badge.ongoing{background:var(--accent-light);color:#8b6914}.admin-toolbar{margin-bottom:12px}.admin-btn-create{background:var(--primary);color:#fff;padding:8px 16px;border-radius:var(--radius-sm);font-size:.85rem;font-weight:700}.admin-create-form{display:flex;gap:8px;margin-bottom:12px;padding:12px;background:var(--card);border:2px solid var(--border-light);border-radius:var(--radius);animation:fadeIn .2s ease-out}.admin-create-form select,.admin-create-form input{flex:1;padding:8px 12px;border:2px solid var(--border);border-radius:var(--radius-sm);font-size:.85rem;font-weight:600;background:var(--bg);color:var(--text)}.admin-btn-confirm{background:var(--primary);color:#fff;padding:8px 16px;border-radius:var(--radius-sm);font-size:.85rem;font-weight:700;white-space:nowrap}.admin-btn-confirm:disabled{opacity:.5;cursor:not-allowed}.admin-btn-delete{background:none;color:var(--danger);font-size:.78rem;font-weight:700;padding:4px 8px;border-radius:var(--radius-sm)}.admin-btn-delete:hover{background:var(--danger);color:#fff}.admin-btn-delete:disabled{opacity:.5;cursor:not-allowed}@media(max-width:480px){.stats-grid{grid-template-columns:repeat(2,1fr)}.admin-create-form{flex-direction:column}}