:root{--color-primary: #409eff;--color-primary-hover: #337ecc;--color-primary-light: #f0f7ff;--color-primary-glow: rgba(64, 158, 255, .12);--color-success: rgba(103, 194, 58, .95);--color-success-border: rgba(103, 194, 58, .3);--color-warning: rgba(249, 202, 36, .95);--color-warning-border: rgba(249, 202, 36, .3);--color-danger: rgba(255, 107, 107, .95);--color-danger-border: rgba(255, 107, 107, .3);--color-info: rgba(64, 158, 255, .95);--color-info-border: rgba(64, 158, 255, .3);--color-text-primary: #303133;--color-text-regular: #333;--color-text-secondary: #666;--color-text-placeholder: #999;--color-text-tertiary: #999;--color-text-disabled: #bbb;--color-bg-page: #ffffff;--color-bg-card: #ffffff;--color-bg-hover: #f8f9fa;--color-bg-muted: #f5f5f5;--color-bg-overlay: rgba(255, 255, 255, .9);--color-border: #e5e7eb;--color-border-dark: #ddd;--color-link: #646cff;--color-link-hover: #535bf2;--color-success-solid: #67c23a;--color-danger-solid: #f56c6c;--color-warning-solid: #f59e0b;--color-strength-weak: #ef4444;--color-strength-medium: #f59e0b;--color-strength-strong: #22c55e;--color-correct: #52c41a;--color-correct-bg: rgba(82, 196, 26, .06);--color-correct-border: #52c41a;--color-wrong: #ff4d4f;--color-wrong-bg: rgba(255, 77, 79, .06);--color-wrong-border: #ff4d4f;--color-diff-basic-bg: #e6f7ee;--color-diff-basic-text: #389e0d;--color-diff-intermediate-bg: #fff7e6;--color-diff-intermediate-text: #d48806;--color-diff-advanced-bg: #fff1f0;--color-diff-advanced-text: #cf1322;--color-diff-olympiad-bg: #f0e6ff;--color-diff-olympiad-text: #722ed1;--color-chart-bg: #fafafa;--color-chart-grid: #e0e0e0;--color-chart-axis: #333;--color-chart-label: #666;--color-chart-line-1: #409eff;--color-chart-line-2: #67c23a;--color-chart-line-3: #f56c6c;--color-chart-hover: rgba(64, 158, 255, .15);--color-chart-crosshair: rgba(64, 158, 255, .4);--color-demo-object: #409eff;--color-demo-force: #f56c6c;--color-demo-force-secondary: #67c23a;--color-demo-highlight: #ff9800;--color-demo-ghost: rgba(64, 158, 255, .3);--circuit-wire: #334155;--circuit-wire-muted: #64748b;--circuit-junction: #d97706;--circuit-resistor-stroke: #1e293b;--circuit-resistor-fill: rgba(255, 255, 255, .5);--circuit-battery-long: #c0392b;--circuit-battery-short: #2980b9;--circuit-meter-stroke: #16a34a;--circuit-meter-text: #0f172a;--circuit-current-arrow: #ea580c;--circuit-label-primary: var(--color-text-primary);--circuit-label-secondary: var(--color-text-secondary);--circuit-line-width: 2;--circuit-line-width-bold: 2.5;--circuit-junction-radius: 3.5;--arcade-canvas-base: #050510;--arcade-canvas-radial-mid: rgba(12, 15, 35, .3);--arcade-canvas-radial-edge: rgba(0, 0, 0, .4);--arcade-canvas-border: var(--color-border);--arcade-sidebar-min: 220px;--arcade-sidebar-max: 280px;--arcade-canvas-min-h: max(400px, min(72vh, 640px));--arcade-canvas-min-h-mobile: max(280px, min(52vh, 480px));--arcade-grid-line: rgba(25, 35, 55, .5);--knowledge-prose-max-width: 100%;--knowledge-heading-h2-size: 1.35rem;--knowledge-heading-h3-size: 1.12rem;--knowledge-heading-h4-size: 1.05rem;--knowledge-prose-line-height: 1.75;--knowledge-list-indent: 1.25rem;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .08);--shadow-md: 0 2px 12px rgba(64, 158, 255, .12);--shadow-lg: 0 4px 20px rgba(0, 0, 0, .15);--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .3s ease;--topbar-height: 72px;--content-top: calc(var(--topbar-height) + 16px);--page-padding: 2rem;--content-max-width: 1200px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji",Segoe UI Symbol;line-height:1.5;font-weight:400;color:var(--color-text-primary);background-color:var(--color-bg-page);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}a{font-weight:500;color:var(--color-link);text-decoration:inherit}a:hover{color:var(--color-link-hover)}html{overflow-x:hidden;width:100%}body{margin:0;padding:0;min-width:320px;min-height:100vh;color:var(--color-text-regular);overflow-x:hidden;-webkit-overflow-scrolling:touch;-webkit-text-size-adjust:100%;width:100%;touch-action:manipulation}h1{font-size:3.2em;line-height:1.1}button{border-radius:var(--radius-md);border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:var(--color-bg-muted);cursor:pointer;transition:border-color var(--transition-normal);-webkit-appearance:none;appearance:none;-webkit-tap-highlight-color:transparent}button:hover{border-color:var(--color-link)}button:focus{outline:none}button:focus-visible,[role=button]:focus-visible{outline:4px auto -webkit-focus-ring-color}input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:6px;background:var(--color-border);border-radius:3px;outline:none;cursor:pointer;transition:background var(--transition-fast)}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:var(--color-primary);border:2px solid var(--color-bg-card);box-shadow:0 1px 4px #0003;cursor:pointer;transition:transform var(--transition-fast),box-shadow var(--transition-fast)}input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.15);box-shadow:0 2px 8px #409eff59}input[type=range]::-webkit-slider-thumb:active{transform:scale(1.05)}input[type=range]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--color-primary);border:2px solid var(--color-bg-card);box-shadow:0 1px 4px #0003;cursor:pointer}input[type=range]::-moz-range-track{height:6px;background:var(--color-border);border-radius:3px;border:none}input[type=range]:focus-visible::-webkit-slider-thumb{box-shadow:0 0 0 3px var(--color-primary-glow)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-xs);padding:10px 20px;min-height:40px;border:1px solid transparent;border-radius:var(--radius-md);font-size:.875rem;font-weight:500;font-family:inherit;line-height:1.4;cursor:pointer;transition:all var(--transition-fast);-webkit-appearance:none;appearance:none;-webkit-tap-highlight-color:transparent;touch-action:manipulation;white-space:nowrap;-webkit-user-select:none;user-select:none}.btn:disabled{opacity:.5;cursor:not-allowed;pointer-events:none}.btn-primary{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.btn-primary:hover:not(:disabled){background:var(--color-primary-hover);border-color:var(--color-primary-hover)}.btn-secondary{background:var(--color-bg-muted);color:var(--color-text-primary);border-color:var(--color-border)}.btn-secondary:hover:not(:disabled){background:var(--color-bg-hover);border-color:var(--color-border-dark)}.btn-danger{background:var(--color-danger-solid);color:#fff;border-color:var(--color-danger-solid)}.btn-danger:hover:not(:disabled){opacity:.9}.btn-ghost{background:transparent;color:var(--color-text-secondary);border-color:transparent}.btn-ghost:hover:not(:disabled){background:var(--color-bg-hover);color:var(--color-text-primary)}.btn-outline{background:transparent;color:var(--color-primary);border-color:var(--color-primary)}.btn-outline:hover:not(:disabled){background:var(--color-primary);color:#fff}.btn-icon{width:40px;height:40px;padding:0;border-radius:var(--radius-md)}.btn-sm{padding:6px 14px;min-height:32px;font-size:.8rem}.btn-lg{padding:12px 28px;min-height:48px;font-size:1rem}@media(max-width:768px){.btn{min-height:44px}.btn-sm{min-height:36px}.btn-icon{width:44px;height:44px}}.mode-toggle button,.sub-toggle button{border-radius:0}.mode-toggle button:first-child,.sub-toggle button:first-child{border-radius:var(--radius-md) 0 0 var(--radius-md)}.mode-toggle button:last-child,.sub-toggle button:last-child{border-radius:0 var(--radius-md) var(--radius-md) 0}.mode-toggle button:only-child,.sub-toggle button:only-child{border-radius:var(--radius-md)}.card{padding:2em}#app{min-height:100vh;display:flex;flex-direction:column;width:100%;max-width:100%;margin:0;padding:0;box-sizing:border-box;overflow-x:hidden}.dark{--color-primary: #5baaff;--color-primary-hover: #79bcff;--color-primary-light: rgba(64, 158, 255, .12);--color-primary-glow: rgba(64, 158, 255, .2);--color-success: rgba(74, 222, 128, .95);--color-success-border: rgba(74, 222, 128, .25);--color-warning: rgba(250, 204, 21, .95);--color-warning-border: rgba(250, 204, 21, .25);--color-danger: rgba(248, 113, 113, .95);--color-danger-border: rgba(248, 113, 113, .25);--color-info: rgba(96, 165, 250, .95);--color-info-border: rgba(96, 165, 250, .25);--color-text-primary: #e5e7eb;--color-text-regular: #d1d5db;--color-text-secondary: #9ca3af;--color-text-placeholder: #6b7280;--color-text-tertiary: #6b7280;--color-text-disabled: #4b5563;--color-bg-page: #0f172a;--color-bg-card: #1e293b;--color-bg-hover: #334155;--color-bg-muted: #1e293b;--color-bg-overlay: rgba(15, 23, 42, .9);--color-border: #334155;--color-border-dark: #475569;--color-link: #818cf8;--color-link-hover: #a5b4fc;--color-success-solid: #4ade80;--color-danger-solid: #f87171;--color-warning-solid: #fbbf24;--color-strength-weak: #f87171;--color-strength-medium: #fbbf24;--color-strength-strong: #4ade80;--color-correct: #4ade80;--color-correct-bg: rgba(74, 222, 128, .1);--color-correct-border: #4ade80;--color-wrong: #f87171;--color-wrong-bg: rgba(248, 113, 113, .1);--color-wrong-border: #f87171;--color-diff-basic-bg: rgba(34, 197, 94, .15);--color-diff-basic-text: #4ade80;--color-diff-intermediate-bg: rgba(234, 179, 8, .15);--color-diff-intermediate-text: #facc15;--color-diff-advanced-bg: rgba(239, 68, 68, .15);--color-diff-advanced-text: #f87171;--color-diff-olympiad-bg: rgba(139, 92, 246, .15);--color-diff-olympiad-text: #a78bfa;--color-chart-bg: #1e293b;--color-chart-grid: #334155;--color-chart-axis: #e2e8f0;--color-chart-label: #94a3b8;--color-chart-line-1: #60a5fa;--color-chart-line-2: #4ade80;--color-chart-line-3: #f87171;--color-chart-hover: rgba(96, 165, 250, .2);--color-chart-crosshair: rgba(96, 165, 250, .5);--color-demo-object: #60a5fa;--color-demo-force: #f87171;--color-demo-force-secondary: #4ade80;--color-demo-highlight: #fb923c;--color-demo-ghost: rgba(96, 165, 250, .3);--circuit-wire: #cbd5e1;--circuit-wire-muted: #94a3b8;--circuit-junction: #fbbf24;--circuit-resistor-stroke: #e2e8f0;--circuit-resistor-fill: rgba(30, 41, 59, .6);--circuit-battery-long: #f87171;--circuit-battery-short: #60a5fa;--circuit-meter-stroke: #4ade80;--circuit-meter-text: #f1f5f9;--circuit-current-arrow: #fb923c;--circuit-label-primary: var(--color-text-primary);--circuit-label-secondary: var(--color-text-secondary);--arcade-canvas-base: #060818;--arcade-canvas-radial-mid: rgba(20, 30, 55, .35);--arcade-canvas-radial-edge: rgba(0, 0, 0, .45);--arcade-canvas-border: var(--color-border);--arcade-grid-line: rgba(100, 130, 180, .35);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 2px 12px rgba(0, 0, 0, .3);--shadow-lg: 0 4px 20px rgba(0, 0, 0, .4);color-scheme:dark}@media(min-width:1440px){:root{--content-max-width: 1400px;--page-padding: 3rem}}@media(max-width:1024px){:root{--page-padding: 1.5rem}}@media(max-width:768px){:root{--topbar-height: 64px;--content-top: calc(var(--topbar-height) + 12px);--page-padding: 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