:root{--bg-color: #f8f9fa;--container-bg: rgba(255, 255, 255, .85);--text-color: #333;--text-secondary: #555;--primary-color: #007bff;--primary-hover: #0056b3;--danger-color: #ff6b6b;--danger-bg: rgba(255, 107, 107, .1);--cell-bg-inactive: #fff;--cell-bg-active: #ff9999;--cell-border: transparent;--grid-bg: #333;--box-shadow: 0 8px 32px rgba(0,0,0,.1);--border-color: rgba(255, 255, 255, .4);--btn-easy-bg: #ccffcc;--btn-normal-bg: #ffffcc;--btn-hard-bg: #ffcccc;--btn-super-bg: #ff99cc;--btn-god-bg: #cc99ff;--btn-reset-bg: #ffddaa;--btn-replay-bg: #87ceeb}@media(prefers-color-scheme:dark){:root{--bg-color: #1a1a2e;--container-bg: rgba(30, 30, 46, .85);--text-color: #eee;--text-secondary: #aaa;--primary-color: #4da3ff;--primary-hover: #2183e2;--danger-color: #ff8c8c;--cell-bg-inactive: #2a2a3e;--cell-bg-active: #ff6b6b;--cell-border: #444;--grid-bg: #111;--box-shadow: 0 8px 32px rgba(0,0,0,.4);--border-color: rgba(255, 255, 255, .1);--btn-easy-bg: #2a5a2a;--btn-normal-bg: #5a5a2a;--btn-hard-bg: #5a2a2a;--btn-super-bg: #5a1a3a;--btn-god-bg: #3a1a5a;--btn-reset-bg: #8a6a3a;--btn-replay-bg: #2a5a7a}}body{font-family:Inter,Roboto,Helvetica Neue,Arial,sans-serif;text-align:center;background-color:var(--bg-color);color:var(--text-color);margin:0;padding:20px;box-sizing:border-box;transition:background-color .3s,color .3s}*{box-sizing:inherit}.container{max-width:500px;margin:0 auto;background:var(--container-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);padding:25px;border-radius:16px;border:1px solid var(--border-color);box-shadow:var(--box-shadow)}h1{font-size:22px;font-weight:800;margin-bottom:20px}.top-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;font-size:13px;gap:6px;flex-wrap:wrap}#streak-display{font-weight:700;color:var(--danger-color);background:var(--danger-bg);padding:4px 10px;border-radius:15px;border:1px solid var(--danger-color)}#btn-toggle-audio,#btn-daily,.top-bar-btn{background:transparent;border:1px solid var(--border-color);color:var(--text-color);border-radius:20px;padding:6px 12px;font-size:13px}.top-bar-btn{background:#007bff1a;color:var(--primary-color);border-color:var(--primary-color)}.top-bar-btn:hover{background:var(--primary-color);color:#fff}#btn-daily{background:var(--btn-god-bg);color:#fff;font-weight:700;border:none}#status-label{font-size:16px;margin-bottom:5px;font-weight:700}#moves-label{font-size:20px;font-weight:700;color:var(--primary-color);margin-bottom:5px}.solver-badge{font-size:12px;color:#fff;background-color:var(--danger-color);padding:4px 10px;border-radius:12px;display:none;margin-bottom:15px;font-weight:700;box-shadow:0 2px 4px #0003}.section-box{border:1px solid var(--border-color);border-radius:8px;padding:15px 10px 10px;margin-bottom:15px;position:relative;background:#00000005}.section-title{font-size:14px;font-weight:700;margin-top:-25px;background:var(--container-bg);display:inline-block;padding:0 8px;color:var(--text-secondary);border-radius:4px}.radio-group{display:flex;justify-content:center;gap:10px;margin-top:10px;flex-wrap:wrap}.btn-group{display:flex;justify-content:center;gap:6px;margin-top:10px;flex-wrap:wrap}button{cursor:pointer;border:none;border-radius:6px;padding:8px 12px;font-size:14px;font-weight:700;color:var(--text-color);transition:transform .1s,opacity .2s,filter .2s}button:hover{filter:brightness(.9);transform:translateY(-1px)}button:active{transform:translateY(1px)}button:disabled{opacity:.5;cursor:not-allowed}#btn-easy{background-color:var(--btn-easy-bg)}#btn-normal{background-color:var(--btn-normal-bg)}#btn-hard{background-color:var(--btn-hard-bg)}#btn-super{background-color:var(--btn-super-bg)}#btn-god{background-color:var(--btn-god-bg);color:#fff}#btn-reset{background-color:var(--btn-reset-bg);width:100%;padding:12px;margin-bottom:15px}#btn-replay{background-color:var(--btn-replay-bg);width:100%;padding:12px;margin-bottom:15px;display:none;color:#fff}#grid-container{display:grid;gap:3px;margin:20px auto;background-color:var(--grid-bg);padding:4px;border-radius:8px;width:100%;max-width:400px;touch-action:none;box-shadow:inset 0 2px 6px #0000004d}.cell{background-color:transparent;aspect-ratio:1 / 1;-webkit-user-select:none;user-select:none;perspective:600px}.cell-inner{width:100%;height:100%;display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--primary-color);background-color:var(--cell-bg-inactive);border:1px solid var(--cell-border);border-radius:4px;transition:transform .3s cubic-bezier(.175,.885,.32,1.275),background-color .2s;transform-style:preserve-3d}.cell.active .cell-inner{background-color:var(--cell-bg-active);transform:rotateY(180deg)}.cell.active .cell-inner>*{transform:rotateY(180deg)}@keyframes blink{0%{transform:scale(1);box-shadow:inset 0 0 0 var(--danger-color)}50%{transform:scale(.95);box-shadow:inset 0 0 15px var(--danger-color)}to{transform:scale(1);box-shadow:inset 0 0 0 var(--danger-color)}}.cell.hint-flash .cell-inner{animation:blink 1s infinite}@keyframes win-pulse{0%{filter:hue-rotate(0deg) brightness(1)}50%{filter:hue-rotate(180deg) brightness(1.5);transform:scale(1.02)}to{filter:hue-rotate(360deg) brightness(1);transform:scale(1)}}.win-flash{animation:win-pulse 1s ease-out}#seed-area{background:transparent;border-style:dashed}.seed-input-group{display:flex;gap:5px;margin-top:5px}#seed-input{flex:1;padding:8px;font-family:inherit;border:1px solid var(--border-color);border-radius:4px;background:#ffffff1a;color:var(--text-color)}.answer-btn{width:100%;padding:10px;margin-bottom:8px;font-size:14px;background-color:var(--bg-color);border:1px solid var(--border-color)}.controls{display:grid;grid-template-columns:60px 60px 60px;gap:8px;justify-content:center;margin-top:15px;margin-bottom:25px}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000a6;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);display:none;align-items:center;justify-content:center;z-index:1000;padding:15px}.modal-content{background:var(--container-bg);padding:24px;border-radius:16px;max-width:92%;width:340px;text-align:left;box-shadow:0 16px 48px #0006;border:1px solid var(--border-color)}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.modal-header h2{margin:0;font-size:18px;font-weight:800}.modal-close-btn{background:transparent;border:none;font-size:24px;line-height:1;color:var(--text-secondary);padding:2px 6px;cursor:pointer;border-radius:6px}.modal-close-btn:hover{color:var(--text-color);background:#0000000d}.modal-content.tutorial-content{width:440px;max-height:85vh;display:flex;flex-direction:column;padding:20px 24px}.tutorial-indicator{display:flex;justify-content:center;gap:8px;margin-bottom:14px}.tutorial-step-dot{width:24px;height:24px;border-radius:50%;background:#0000001a;color:var(--text-secondary);font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s}.tutorial-step-dot.active{background:var(--primary-color);color:#fff;transform:scale(1.15)}.tutorial-step-dot.passed{background:var(--btn-replay-bg);color:#fff}.tutorial-step-panel{flex:1;overflow-y:auto;padding-right:4px}.tutorial-badge{display:inline-block;font-size:11px;font-weight:700;color:var(--primary-color);background:#007bff1f;padding:2px 8px;border-radius:10px;margin-bottom:6px}.tutorial-step-panel h3{margin:0 0 10px;font-size:16px;color:var(--text-color)}.tutorial-step-panel p{font-size:13px;line-height:1.6;color:var(--text-secondary);margin:0 0 12px}.tutorial-note{font-size:12px!important;background:#00000008;padding:8px 10px;border-radius:6px;border-left:3px solid var(--primary-color);margin-top:10px!important}.tutorial-visual-row{display:flex;align-items:center;justify-content:center;gap:12px;margin:14px 0}.tutorial-card{display:flex;flex-direction:column;align-items:center;gap:6px;font-size:12px;font-weight:700;color:var(--text-color)}.sample-grid{display:grid;grid-template-columns:repeat(2,32px);gap:3px;background:var(--grid-bg);padding:3px;border-radius:6px}.sample-cell{width:32px;height:32px;background:var(--cell-bg-inactive);border-radius:3px}.sample-cell.active{background:var(--cell-bg-active)}.tutorial-or{font-size:13px;font-weight:700;color:var(--text-secondary)}.tutorial-feature-list{display:flex;flex-direction:column;gap:10px;margin:10px 0}.tutorial-feature-item{display:flex;align-items:flex-start;gap:10px;padding:10px;background:#00000005;border:1px solid var(--border-color);border-radius:8px}.tutorial-feature-item.alert-item{background:var(--danger-bg);border-color:var(--danger-color)}.tutorial-feature-item strong{font-size:13px;color:var(--text-color)}.tutorial-feature-item p{font-size:12px;margin:4px 0 0}.feature-icon{font-size:20px;line-height:1}.tutorial-controls-guide{display:flex;flex-direction:column;gap:10px}.control-box{padding:10px 12px;border:1px solid var(--border-color);border-radius:8px;background:#00000005}.control-box-title{font-size:13px;font-weight:700;margin-bottom:4px;color:var(--text-color)}.practice-status-text{font-size:13px;font-weight:700;text-align:center;min-height:20px;margin-bottom:8px!important}.mini-grid{display:grid;gap:3px;margin:8px auto;background-color:var(--grid-bg);padding:4px;border-radius:8px;width:140px;aspect-ratio:1 / 1;touch-action:none;box-shadow:inset 0 2px 4px #0000004d}.mini-grid .cell{aspect-ratio:1 / 1;font-size:18px}.mini-controls{display:grid;grid-template-columns:44px 44px 44px;gap:5px;justify-content:center;margin:8px 0}.mini-controls button{padding:8px 0;font-size:13px;background:#0000000f;border:1px solid var(--border-color)}.mini-reset-btn{background:var(--btn-reset-bg)!important;font-size:12px!important;padding:6px 14px!important;border-radius:20px!important}.tutorial-tips-list{display:grid;grid-template-columns:1fr;gap:8px}.tip-card{padding:8px 12px;border:1px solid var(--border-color);border-radius:8px;background:#00000005}.tip-card strong{font-size:13px;display:block;margin-bottom:2px;color:var(--text-color)}.tip-card p{font-size:12px;margin:0;line-height:1.4}.tutorial-footer{display:flex;justify-content:space-between;gap:12px;margin-top:16px;padding-top:12px;border-top:1px solid var(--border-color)}.tutorial-nav-btn{padding:10px 16px;border-radius:8px;font-size:14px;font-weight:700;flex:1}.tutorial-nav-btn.primary{background:var(--primary-color);color:#fff}.tutorial-nav-btn.secondary{background:#0000000f;color:var(--text-color);border:1px solid var(--border-color)}.start-btn-highlight{background:#28a745!important;color:#fff!important;box-shadow:0 4px 12px #28a74566}