/* ============================================================
   妙境AI · Design Tokens
   Technology gray palette + primary blue
   ============================================================ */

:root {
  /* ---------- Brand / Primary ---------- */
  --color-primary: #3B82F6;
  --color-primary-hover: #2563EB;
  --color-primary-active: #1D4ED8;
  --color-primary-50: #EFF6FF;
  --color-primary-100: #DBEAFE;
  --color-primary-200: #BFDBFE;
  --color-primary-600: #2563EB;
  --color-primary-700: #1D4ED8;

  /* ---------- Neutral / Slate (tech gray) ---------- */
  --color-bg: #F8FAFC;
  --color-bg-alt: #F1F5F9;
  --color-surface: #FFFFFF;
  --color-slate-50: #F8FAFC;
  --color-slate-100: #F1F5F9;
  --color-slate-200: #E2E8F0;
  --color-slate-300: #CBD5E1;
  --color-slate-400: #94A3B8;
  --color-slate-500: #64748B;
  --color-slate-600: #475569;
  --color-slate-700: #334155;
  --color-slate-800: #1E293B;
  --color-slate-900: #0F172A;

  --color-text: #0F172A;
  --color-text-secondary: #475569;
  --color-text-tertiary: #94A3B8;
  --color-border: #E2E8F0;
  --color-border-strong: #CBD5E1;

  /* ---------- Semantic ---------- */
  --color-success: #10B981;
  --color-success-bg: #ECFDF5;
  --color-warning: #F59E0B;
  --color-warning-bg: #FFFBEB;
  --color-danger: #EF4444;
  --color-danger-bg: #FEF2F2;
  --color-info: #3B82F6;
  --color-info-bg: #EFF6FF;
  --color-purple: #8B5CF6;
  --color-purple-bg: #F5F3FF;

  /* ---------- Typography ---------- */
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont,
    'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', ui-monospace, monospace;

  --text-xs: 0.75rem;     /* 12 */
  --text-sm: 0.875rem;    /* 14 */
  --text-base: 1rem;      /* 16 */
  --text-lg: 1.125rem;    /* 18 */
  --text-xl: 1.25rem;     /* 20 */
  --text-2xl: 1.5rem;     /* 24 */
  --text-3xl: 1.875rem;   /* 30 */
  --text-4xl: 2.25rem;    /* 36 */
  --text-5xl: 3rem;       /* 48 */
  --text-6xl: 3.75rem;    /* 60 */

  --leading-tight: 1.15;
  --leading-snug: 1.35;
  --leading-normal: 1.6;

  --tracking-tight: -0.02em;
  --tracking-tighter: -0.035em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;

  --font-regular: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* ---------- Spacing scale ---------- */
  --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;

  /* ---------- Radius ---------- */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* ---------- Shadows (soft) ---------- */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.06), 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.08), 0 4px 12px rgba(15, 23, 42, 0.05);
  --shadow-xl: 0 24px 56px rgba(15, 23, 42, 0.10), 0 8px 24px rgba(15, 23, 42, 0.06);
  --shadow-primary: 0 8px 24px rgba(59, 130, 246, 0.25);

  /* ---------- Layout ---------- */
  --container-max: 1200px;
  --container-narrow: 880px;
  --navbar-height: 68px;

  /* ---------- Motion ---------- */
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 120ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 320ms cubic-bezier(0.4, 0, 0.2, 1);

  /* ---------- Z-index ---------- */
  --z-navbar: 100;
  --z-sidebar: 90;
  --z-overlay: 80;
  --z-dropdown: 70;
}