:root {
  --color-brand: #0052d9;
  --color-brand-dark: #003da6;
  --color-brand-light: rgba(0, 82, 217, 0.22);
  --color-accent: #00a4ff;
  --color-cyan: #7dd3fc;
  --color-ai: #6366f1;

  --bg-deep: #020617;
  --bg-mid: #0a1628;
  --bg-page: linear-gradient(160deg, #020617 0%, #0a1628 35%, #0c2347 70%, #051a38 100%);
  --bg-hero: linear-gradient(160deg, #020617 0%, #0a1628 35%, #0c2347 70%, #051a38 100%);

  --glass-bg: rgba(15, 23, 42, 0.55);
  --glass-bg-light: rgba(15, 23, 42, 0.38);
  --glass-bg-strong: rgba(15, 23, 42, 0.72);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-border-hover: rgba(125, 211, 252, 0.28);
  --glass-blur: blur(16px);

  --text-primary: #f1f5f9;
  --text-secondary: rgba(255, 255, 255, 0.68);
  --text-dim: rgba(255, 255, 255, 0.45);
  --text-light: #ffffff;
  --text-muted-light: rgba(255, 255, 255, 0.72);

  --border: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.14);

  --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.28);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 8px 32px rgba(0, 82, 217, 0.15);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --nav-height: 64px;
  --topbar-height: 36px;
  --container-max: 1200px;
  --section-pad: clamp(64px, 8vw, 88px);
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}