/* ============================================
   Design Tokens - 单点真相
   ============================================ */

:root {
  /* === 字体 === */
  --font-display: "Bricolage Grotesque", "Fraunces", Georgia, serif;
  --font-body: "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SF Mono", Consolas, monospace;

  /* === 颜色 - 深色基底 === */
  --color-bg-base: #08080c;
  --color-bg-elevated: #0e0e14;
  --color-bg-card: rgba(255, 255, 255, 0.025);
  --color-bg-card-hover: rgba(255, 255, 255, 0.045);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.16);

  /* === 颜色 - 文字 === */
  --color-text-primary: #fafaff;
  --color-text-secondary: rgba(250, 250, 255, 0.66);
  --color-text-tertiary: rgba(250, 250, 255, 0.42);
  --color-text-muted: rgba(250, 250, 255, 0.28);

  /* === 颜色 - 强调 === */
  --color-accent-primary: #a78bfa;
  --color-accent-secondary: #22d3ee;
  --color-accent-tertiary: #f472b6;
  --color-accent-success: #34d399;
  --color-accent-warning: #fbbf24;

  /* === 渐变 === */
  --gradient-primary: linear-gradient(135deg, #a78bfa 0%, #22d3ee 100%);
  --gradient-accent: linear-gradient(135deg, #f472b6 0%, #a78bfa 50%, #22d3ee 100%);
  --gradient-mesh: radial-gradient(at 20% 20%, rgba(167, 139, 250, 0.18) 0px, transparent 50%),
                   radial-gradient(at 80% 30%, rgba(34, 211, 238, 0.15) 0px, transparent 50%),
                   radial-gradient(at 50% 80%, rgba(244, 114, 182, 0.12) 0px, transparent 50%);
  --gradient-text: linear-gradient(135deg, #fafaff 0%, rgba(250, 250, 255, 0.55) 100%);
  --gradient-glow: radial-gradient(circle at center, rgba(167, 139, 250, 0.4) 0%, transparent 70%);

  /* === 间距 (4px 基准) === */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* === 圆角 === */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-2xl: 32px;
  --radius-full: 9999px;

  /* === 字号 (流体排版) === */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: clamp(2.25rem, 4vw, 3rem);
  --text-5xl: clamp(2.75rem, 5vw, 3.75rem);
  --text-6xl: clamp(3.25rem, 7vw, 5.5rem);
  --text-display: clamp(3.5rem, 8vw, 7rem);

  /* === 字重 === */
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-extrabold: 800;

  /* === 行高 === */
  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.7;

  /* === 阴影 === */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(167, 139, 250, 0.35);
  --shadow-glow-cyan: 0 0 40px rgba(34, 211, 238, 0.35);

  /* === 过渡 === */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 150ms;
  --duration-base: 280ms;
  --duration-slow: 480ms;
  --duration-slower: 800ms;

  /* === 布局 === */
  --container-max: 1240px;
  --container-padding: clamp(1rem, 4vw, 2.5rem);
  --nav-height: 72px;
  --z-base: 1;
  --z-elevated: 10;
  --z-nav: 50;
  --z-overlay: 100;
  --z-modal: 200;
}