/* Design tokens — Feishu Doc inspired */
:root {
  /* Surfaces */
  --bg-page: #f5f6f7;
  --bg-sidebar: #ffffff;
  --bg-doc: #ffffff;
  --bg-subtle: #f2f3f5;
  --bg-code: #f5f6f7;
  --bg-demo: #fafbfc;

  /* Text */
  --text-primary: #1f2329;
  --text-secondary: #646a73;
  --text-tertiary: #8f959e;
  --text-link: #3370ff;
  --text-code: #d83931;

  /* Borders */
  --border: #dee0e3;
  --border-light: #ebecef;

  /* Accent */
  --accent: #3370ff;
  --accent-hover: #245bdb;
  --accent-bg: #e1eaff;

  /* Semantic */
  --success: #34c724;
  --success-bg: #eaffea;
  --warning: #ff8800;
  --warning-bg: #fff7e8;
  --danger: #f54a45;
  --danger-bg: #ffece8;
  --info-bg: #e1eaff;

  /* Difficulty */
  --easy: #34c724;
  --medium: #ff8800;
  --hard: #f54a45;

  /* Viz */
  --viz-bar: #646a73;
  --viz-water: #94bfff;
  --viz-active: #ff8800;
  --viz-ptr-l: #f54a45;
  --viz-ptr-r: #34c724;

  /* Layout */
  --sidebar-width: 260px;
  --toc-width: 200px;
  --header-height: 52px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", Consolas, "Courier New", monospace;

  --text-xs: 12px;
  --text-sm: 13px;
  --text-base: 15px;
  --text-lg: 17px;
  --text-xl: 22px;
  --text-2xl: 28px;

  --leading: 1.75;
  --radius: 6px;
  --radius-lg: 8px;

  --shadow-sm: 0 1px 2px rgba(31, 35, 41, 0.04);
}