/* ============================================
   base.css — Design Tokens + Reset
   創作者知識中台
   ============================================ */

:root {
  /* --- 主色調 --- */
  --color-primary: #1a2332;
  --color-primary-light: #2d3a4a;
  --color-primary-lighter: #3d4f63;
  --color-accent: #d4a853;
  --color-accent-hover: #c09940;
  --color-accent-light: rgba(212, 168, 83, 0.15);

  /* --- 知識五層色 --- */
  --color-layer-why: #e74c3c;
  --color-layer-what: #3498db;
  --color-layer-how: #2ecc71;
  --color-layer-evidence: #f39c12;
  --color-layer-evolution: #9b59b6;

  --color-layer-why-bg: rgba(231, 76, 60, 0.1);
  --color-layer-what-bg: rgba(52, 152, 219, 0.1);
  --color-layer-how-bg: rgba(46, 204, 113, 0.1);
  --color-layer-evidence-bg: rgba(243, 156, 18, 0.1);
  --color-layer-evolution-bg: rgba(155, 89, 182, 0.1);

  /* --- 品質等級色 --- */
  --color-grade-s: #ffd700;
  --color-grade-a: #4caf50;
  --color-grade-b: #2196f3;
  --color-grade-c: #ff9800;
  --color-grade-d: #9e9e9e;

  --color-grade-s-bg: rgba(255, 215, 0, 0.12);
  --color-grade-a-bg: rgba(76, 175, 80, 0.12);
  --color-grade-b-bg: rgba(33, 150, 243, 0.12);
  --color-grade-c-bg: rgba(255, 152, 0, 0.12);
  --color-grade-d-bg: rgba(158, 158, 158, 0.12);

  /* --- 語意色 --- */
  --color-success: #27ae60;
  --color-success-hover: #229954;
  --color-warning: #f39c12;
  --color-warning-hover: #d68910;
  --color-danger: #e74c3c;
  --color-danger-hover: #c0392b;
  --color-info: #3498db;
  --color-info-hover: #2980b9;

  /* --- 文字色 --- */
  --color-text: #2c3e50;
  --color-text-secondary: #7f8c8d;
  --color-text-heading: #1a2332;
  --color-text-label: #34495e;
  --color-text-muted: #95a5a6;

  /* --- 背景色 --- */
  --color-bg: #f0f2f5;
  --color-bg-white: #ffffff;
  --color-bg-light: #f8f9fb;
  --color-bg-sidebar: #1a2332;
  --color-bg-sidebar-hover: #2d3a4a;
  --color-bg-sidebar-active: rgba(212, 168, 83, 0.15);

  /* --- Tint 背景 --- */
  --color-bg-success: #d5f4e6;
  --color-bg-danger: #f8d7da;
  --color-bg-warning: #fff3cd;
  --color-bg-info: #d1ecf1;
  --color-bg-neutral: #e2e3e5;

  /* --- Sidebar 文字 --- */
  --color-text-sidebar: #8a9bb5;
  --color-text-sidebar-hover: #c5d0e0;
  --color-text-sidebar-active: #ffffff;
  --color-text-sidebar-group: #5a6b80;

  /* --- 邊框 --- */
  --color-border: #e2e8f0;
  --color-border-light: #edf2f7;

  /* --- 陰影 --- */
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-elevated: 0 10px 25px rgba(0, 0, 0, 0.08);
  --shadow-sidebar: 2px 0 8px rgba(0, 0, 0, 0.1);

  /* --- 圓角 --- */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 20px;
  --radius-round: 50%;

  /* --- 間距 --- */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;

  /* --- Sidebar 尺寸 --- */
  --sidebar-width: 240px;
  --sidebar-collapsed-width: 64px;

  /* --- 字體 --- */
  --font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Noto Sans TC', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;

  /* --- 動畫 --- */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* --- 便捷別名 --- */
  --radius: var(--radius-md);
  --transition: var(--transition-normal);
}

/* --- Reset --- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  margin: 0;
  padding: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-heading);
  line-height: 1.3;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  color: var(--color-accent-hover);
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-bg-light);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
}