:root {
  /* 颜色 */
  --color-bg:          #0A0E1A;
  --color-bg-card:     #0D1526;
  --color-bg-card2:    #111827;
  --color-primary:     #0066FF;
  --color-primary-light: #00A8FF;
  --color-accent:      #00D4FF;
  --color-gold:        #F0A500;
  --color-text:        #E8F0FE;
  --color-text-muted:  #8899BB;
  --color-border:      rgba(0, 168, 255, 0.15);
  --color-border-dim:  rgba(255,255,255,0.06);

  /* 渐变 */
  --grad-primary: linear-gradient(135deg, #0066FF 0%, #00D4FF 100%);
  --grad-hero:    radial-gradient(ellipse at 20% 50%, #0D2B6B 0%, #0A0E1A 60%);

  /* 字体 */
  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-en:   'Inter', sans-serif;

  /* 间距 */
  --section-py: clamp(60px, 8vw, 120px);
  --container:  1320px;
  --gap:        24px;

  /* 圆角 */
  --radius-sm:  8px;
  --radius-md:  16px;
  --radius-lg:  24px;

  /* 阴影 */
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4), 0 0 0 1px var(--color-border);
  --shadow-glow: 0 0 30px rgba(0,168,255,0.15), 0 0 60px rgba(0,102,255,0.08);

  /* 过渡 */
  --transition: 0.3s ease;
  --transition-slow: 0.6s ease;
}