:root{--color-primary: #4A90D9;--color-secondary: #FF6B35;--color-success: #009E60;--color-error: #E74C3C;--color-bg: #f0f4ff;--color-card: #fff;--color-text: #2c3e50;--color-text-light: #7f8c8d;--btn-min-height: 56px;--btn-font-size: 20px;--cell-size: 64px;--move-card-size: 64px;--font-size-base: 18px;--font-size-large: 24px;--font-size-xl: 32px;--font-size-title: 36px;--radius-pill: 28px;--radius-card: 20px;--radius-cell: 8px;--shadow: 0 2px 8px rgba(0,0,0,.08);--shadow-big: 0 4px 16px rgba(0,0,0,.12);--gradient-header: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--gradient-primary: linear-gradient(135deg, #4A90D9, #8B5CF6);--gradient-success: linear-gradient(135deg, #009E60, #00D68F);--gradient-scramble: linear-gradient(135deg, #FF6B35, #FF9A56);--bounce: cubic-bezier(.68, -.55, .265, 1.55)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:PingFang SC,Microsoft YaHei,Arial,sans-serif;background:linear-gradient(135deg,#f0f4ff,#e8f0fe,#f5f0ff);color:var(--color-text);font-size:var(--font-size-base);min-height:100vh;-webkit-tap-highlight-color:transparent;user-select:none;line-height:1.5;touch-action:manipulation}#app{max-width:800px;margin:0 auto;padding:12px}.app-header{text-align:center;padding:24px 20px 20px;background:var(--gradient-header);border-radius:var(--radius-card);margin-bottom:16px;box-shadow:var(--shadow-big)}.app-header h1{font-size:var(--font-size-title);color:#fff;text-shadow:0 2px 4px rgba(0,0,0,.2);margin:0}.app-header .subtitle{display:block;font-size:16px;color:#ffffffd9;margin-top:6px}.mode-switcher{display:flex;gap:12px;margin-top:16px;position:sticky;bottom:0;padding:8px 12px calc(8px + env(safe-area-inset-bottom));background:linear-gradient(transparent,var(--color-bg) 30%);z-index:100}.mode-btn{flex:1;padding:14px 8px;font-size:15px;border:3px solid #dce4ec;border-radius:var(--radius-pill);background:var(--color-card);font-size:var(--font-size-large);font-weight:700;cursor:pointer;color:var(--color-text-light);box-shadow:var(--shadow);transition:all .25s var(--bounce);font-family:inherit;min-height:var(--btn-min-height);display:flex;align-items:center;justify-content:center;gap:6px;-webkit-tap-highlight-color:transparent}.mode-btn.active{background:var(--gradient-primary);color:#fff;border-color:transparent;box-shadow:var(--shadow-big);transform:scale(1.03)}.mode-btn:active{transform:scale(.95)}.card{background:var(--color-card);border-radius:var(--radius-card);padding:20px;box-shadow:var(--shadow);margin-bottom:16px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 28px;border:none;border-radius:var(--radius-pill);font-size:var(--btn-font-size);font-weight:700;cursor:pointer;transition:all .2s var(--bounce);font-family:inherit;-webkit-tap-highlight-color:transparent;min-height:var(--btn-min-height);box-shadow:var(--shadow)}.btn:active{transform:scale(.94)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-primary{background:var(--gradient-primary);color:#fff}.btn-secondary{background:var(--gradient-scramble);color:#fff}.btn-success{background:var(--gradient-success);color:#fff}.btn-large{padding:20px 40px;font-size:24px;min-height:64px}.btn-icon{width:56px;height:56px;padding:0;border-radius:50%;font-size:24px;min-width:56px}.player-container{width:100%;max-width:400px;margin:0 auto;min-height:320px}.scramble-controls{display:flex;flex-direction:column;align-items:center;gap:14px}.scramble-slider-row{display:flex;align-items:center;gap:14px;width:100%;max-width:380px}.scramble-slider-row label{font-size:var(--font-size-base);font-weight:700;white-space:nowrap}.scramble-slider-row input[type=range]{flex:1;height:8px;-webkit-appearance:none;appearance:none;background:linear-gradient(90deg,var(--color-primary),var(--color-secondary));border-radius:4px;outline:none}.scramble-slider-row input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:28px;height:28px;border-radius:50%;background:#fff;border:3px solid var(--color-primary);cursor:pointer;box-shadow:var(--shadow)}.slider-value{font-size:32px;font-weight:900;color:var(--color-secondary);min-width:44px;text-align:center}.scramble-button-row{display:flex;gap:12px;flex-wrap:wrap;justify-content:center}.scramble-text{background:#f8f9fa;border-radius:var(--radius-cell);padding:12px 16px;font-family:SF Mono,Consolas,monospace;font-size:15px;text-align:center;letter-spacing:1px;word-break:break-all;margin:8px 0}.face-grid{display:grid;grid-template-columns:repeat(3,var(--cell-size));grid-template-rows:repeat(3,var(--cell-size));gap:3px;background:#333;padding:3px;border-radius:var(--radius-cell);box-shadow:var(--shadow)}.face-cell{width:var(--cell-size);height:var(--cell-size);border:none;border-radius:var(--radius-cell);cursor:pointer;transition:transform .15s;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:16px}.face-cell:active{transform:scale(.9)}.color-swatch{width:44px;height:44px;border-radius:50%;border:3px solid #ddd;cursor:pointer;font-size:14px;font-weight:700;transition:transform .15s,border-color .15s,box-shadow .15s;display:flex;align-items:center;justify-content:center;-webkit-tap-highlight-color:transparent}.color-swatch:active{transform:scale(.88)}.color-swatch.disabled{opacity:.4;cursor:not-allowed;transform:none!important}.face-nav{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}.face-nav-btn{width:44px;height:44px;border-radius:50%;border:3px solid transparent;cursor:pointer;font-weight:700;font-size:16px;transition:all .2s var(--bounce);box-shadow:var(--shadow);-webkit-tap-highlight-color:transparent}.face-nav-btn.current{border-color:var(--color-secondary);box-shadow:0 0 0 4px #ff6b354d;transform:scale(1.1)}.solve-panel{animation:slideUp .4s ease}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.step-counter{font-size:var(--font-size-large);font-weight:700;color:var(--color-primary);text-align:center}.current-move{font-size:52px;font-weight:900;text-align:center;padding:16px;color:var(--color-secondary);background:#fff5f0;border-radius:var(--radius-card);margin:12px auto;max-width:200px;font-family:PingFang SC,Microsoft YaHei,sans-serif}.step-controls{display:flex;align-items:center;justify-content:center;gap:12px;margin:12px 0;flex-wrap:wrap}.move-list{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;max-height:140px;overflow-y:auto;padding:8px}.move-badge{display:inline-flex;align-items:center;justify-content:center;width:var(--move-card-size);height:var(--move-card-size);border-radius:var(--radius-cell);cursor:pointer;font-size:18px;font-weight:800;transition:all .2s var(--bounce);box-shadow:var(--shadow);position:relative}.move-badge:active{transform:scale(.88)}.move-badge.done{opacity:.4;filter:grayscale(30%)}.move-badge.current-move-badge{transform:scale(1.15);box-shadow:var(--shadow-big)}.speed-control{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:8px}.speed-control span{font-size:14px;font-weight:600}.speed-control input[type=range]{width:80px}.status-msg{margin-top:12px;font-size:var(--font-size-base);text-align:center;padding:10px 18px;border-radius:var(--radius-pill);background:#f8f9fa;font-weight:600}.status-msg.success{background:#e8faf0;color:var(--color-success)}.status-msg.error{background:#fde8e8;color:var(--color-error)}.celebration-overlay{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;z-index:2000;pointer-events:none;animation:celebrateFade 2.5s ease forwards}@keyframes celebrateFade{0%{opacity:0;transform:scale(.5)}15%{opacity:1;transform:scale(1)}75%{opacity:1;transform:scale(1)}to{opacity:0;transform:scale(1.5)}}.celebration-text{font-size:64px;font-weight:900;color:var(--color-success);text-shadow:0 4px 24px rgba(0,158,96,.4);background:#ffffffeb;padding:28px 48px;border-radius:var(--radius-card);box-shadow:var(--shadow-big)}@keyframes pulse{0%,to{box-shadow:0 0 #009e6066}50%{box-shadow:0 0 0 12px #009e6000}}.btn-pulse{animation:pulse 1.5s infinite}.camera-container{position:relative;width:100%;max-width:400px;margin:0 auto;border-radius:var(--radius-card);overflow:hidden;box-shadow:var(--shadow)}.camera-container .overlay-canvas{position:absolute;top:0;left:0;width:100%;height:100%}.text-center{text-align:center}@media(min-width:768px){:root{--cell-size: 74px;--move-card-size: 72px}.player-container{max-width:440px}.color-swatch{width:52px;height:52px;font-size:16px}.face-nav-btn{width:50px;height:50px;font-size:18px}}@media(max-width:500px){:root{--btn-min-height: 48px;--btn-font-size: 17px;--cell-size: 50px;--move-card-size: 50px;--font-size-base: 16px;--font-size-large: 20px;--font-size-xl: 26px;--font-size-title: 28px}#app{padding:8px}.app-header{padding:18px 12px 14px}.card{padding:12px}.mode-btn{padding:14px 8px;font-size:16px}.btn{padding:12px 20px}.btn-large{padding:16px 28px;font-size:20px}.btn-icon{width:48px;height:48px;min-width:48px;font-size:20px}.current-move{font-size:40px;padding:10px}.celebration-text{font-size:36px;padding:16px 24px}.scramble-slider-row label{font-size:14px}.slider-value{font-size:24px}.step-controls{gap:8px}.color-swatch{width:38px;height:38px;font-size:12px}.face-nav-btn{width:38px;height:38px;font-size:14px}}