:root {
  color-scheme: light;

  --color-bg: #f6f7fb;
  --color-bg-strong: #eef2ff;
  --color-surface: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.78);
  --color-surface-muted: #eef2f6;
  --color-surface-raised: #fbfcff;
  --color-border: rgba(18, 24, 38, 0.08);
  --color-border-strong: rgba(18, 24, 38, 0.14);
  --color-text: #121826;
  --color-text-soft: #344054;
  --color-text-muted: #667085;
  --color-text-inverse: #ffffff;
  --color-primary: #4f6bff;
  --color-primary-strong: #3d56e8;
  --color-primary-soft: #e8edff;
  --color-success: #22c55e;
  --color-success-soft: #e9f9ef;
  --color-warning: #f59e0b;
  --color-warning-soft: #fff6df;
  --color-danger: #ff5a5f;
  --color-danger-soft: #fff0f1;

  --gradient-primary: linear-gradient(135deg, #4f6bff 0%, #8b5cf6 100%);
  --gradient-focus: linear-gradient(135deg, #eef2ff 0%, #f8f5ff 55%, #ffffff 100%);
  --gradient-calm: linear-gradient(135deg, #ecfeff 0%, #f7f7ff 54%, #ffffff 100%);

  --font-family: Inter, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.5rem;
  --text-2xl: 1.75rem;
  --text-display: clamp(3.5rem, 18vw, 5rem);

  --line-tight: 1.12;
  --line-title: 1.22;
  --line-body: 1.5;

  --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;

  --radius-sm: 0.875rem;
  --radius-md: 1.25rem;
  --radius-lg: 1.75rem;
  --radius-xl: 2rem;
  --radius-full: 999px;

  --shadow-soft: 0 10px 30px rgba(35, 43, 86, 0.08);
  --shadow-card: 0 18px 54px rgba(35, 43, 86, 0.12);
  --shadow-ring: 0 0 0 4px rgba(79, 107, 255, 0.14);

  --blur-glass: blur(18px);
  --motion-fast: 140ms ease;
  --motion-base: 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
  --motion-slow: 260ms cubic-bezier(0.2, 0.8, 0.2, 1);

  --content-width: 27rem;
  --tap-size: 2.75rem;
}