/* ============================================================
   Design Tokens — Huang Lab website
   ============================================================ */
:root {
  /* Palette */
  --navy-900: #0A1C33;
  --navy-800: #0C2138;
  --navy-700: #12365F;
  --navy-600: #1B4A7A;
  --teal-600: #0F766E;
  --teal-500: #14B8A6;
  --teal-400: #2DD4BF;
  --cyan-400: #22D3EE;
  --bg: #F4F7FA;
  --surface: #FFFFFF;
  --ink: #243B53;
  --ink-soft: #526581;
  --line: #DCE4EE;
  --line-soft: #E8EDF4;
  --on-dark: rgba(255, 255, 255, 0.78);

  /* Type */
  --font-sans: "Inter", "SF Pro Text", -apple-system, BlinkMacSystemFont,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    "Segoe UI", system-ui, sans-serif;

  /* Geometry */
  --nav-h: 64px;
  --radius: 8px;
  --radius-sm: 5px;
  --shadow-sm: 0 2px 10px rgba(12, 33, 56, 0.08);
  --shadow-md: 0 14px 34px rgba(12, 33, 56, 0.13);

  /* Motion */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 240ms;
}