/**
 * =================================================================
 * RINOEDU - DESIGN TOKENS (Single Source of Truth)
 * =================================================================
 * Agent `ui` owns this file. ALL colors, spacing, typography must
 * be defined here first before being used anywhere in the system.
 * Agent `fe` MUST use these CSS variables instead of hardcoded values.
 * =================================================================
 */

:root {
  /* ── BRAND COLORS ── */
  --color-brand-primary: #2563eb;
  /* Blue 600 - Main Brand */
  --color-brand-hover: #1d4ed8;
  /* Blue 700 - Hover State */
  --color-brand-light: #eff6ff;
  /* Blue 50 - Subtle bg */
  --color-brand-glow: rgba(59, 130, 246, 0.15);

  /* ── SEMANTIC (Status) COLORS ── */
  --color-success: #16a34a;
  /* Green 600 */
  --color-success-light: #f0fdf4;
  /* Green 50 */
  --color-warning: #d97706;
  /* Amber 600 */
  --color-warning-light: #fffbeb;
  /* Amber 50 */
  --color-danger: #dc2626;
  /* Red 600 */
  --color-danger-light: #fef2f2;
  /* Red 50 */
  --color-info: #0891b2;
  /* Cyan 600 */
  --color-info-light: #ecfeff;
  /* Cyan 50 */

  /* ── NEUTRAL / SURFACE COLORS (Light Mode) ── */
  --color-bg: #f8fafc;
  /* slate-50 - App background */
  --color-surface: #ffffff;
  /* White - Cards, panels */
  --color-surface-alt: #f1f5f9;
  /* slate-100 - Alt surface */
  --color-border: #e2e8f0;
  /* slate-200 */
  --color-border-strong: #cbd5e1;
  /* slate-300 */

  /* ── TEXT COLORS ── */
  --color-text-primary: #1e293b;
  /* slate-800 */
  --color-text-secondary: #64748b;
  /* slate-500 */
  --color-text-muted: #94a3b8;
  /* slate-400 */

  /* ── SIDEBAR ── */
  --color-sidebar-bg: #0f172a;
  /* slate-900 */
  --color-sidebar-icon: #94a3b8;
  /* slate-400 */
  --color-sidebar-icon-active: #ffffff;

  /* ── TYPOGRAPHY ── */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  /* 12px */
  --font-size-sm: 0.875rem;
  /* 14px */
  --font-size-base: 1rem;
  /* 16px */
  --font-size-lg: 1.125rem;
  /* 18px */
  --font-size-xl: 1.25rem;
  /* 20px */
  --font-size-2xl: 1.5rem;
  /* 24px */
  --font-size-3xl: 1.875rem;
  /* 30px */
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* ── SPACING SCALE ── */
  --space-1: 0.25rem;
  /* 4px */
  --space-2: 0.5rem;
  /* 8px */
  --space-3: 0.75rem;
  /* 12px */
  --space-4: 1rem;
  /* 16px */
  --space-5: 1.25rem;
  /* 20px */
  --space-6: 1.5rem;
  /* 24px */
  --space-8: 2rem;
  /* 32px */
  --space-10: 2.5rem;
  /* 40px */
  --space-12: 3rem;
  /* 48px */

  /* ── BORDER RADIUS ── */
  --radius-sm: 0.375rem;
  /* 6px */
  --radius-md: 0.5rem;
  /* 8px */
  --radius-lg: 0.75rem;
  /* 12px */
  --radius-xl: 1rem;
  /* 16px */
  --radius-2xl: 1.5rem;
  /* 24px */
  --radius-full: 9999px;

  /* ── SHADOWS ── */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.10), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-soft: 0 4px 20px -2px rgba(0, 0, 0, 0.05);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.10), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 0 15px var(--color-brand-glow);
  --shadow-focus: 0 0 0 3px var(--color-brand-glow);

  /* ── TRANSITIONS ── */
  --transition-fast: 150ms ease-out;
  --transition-base: 200ms ease-out;
  --transition-slow: 300ms cubic-bezier(0.16, 1, 0.3, 1);

  /* ── Z-INDEX SCALE ── */
  --z-dropdown: 50;
  --z-sticky: 100;
  --z-overlay: 200;
  --z-modal: 300;
  --z-tooltip: 400;
}

/* ── RESPONSIVE TYPOGRAPHY (Mobile) ── */
@media (max-width: 768px) {
  :root {
    --font-size-3xl: 1.5rem;
    /* Scale down from 30px to 24px */
    --font-size-2xl: 1.25rem;
    /* Scale down from 24px to 20px */
    --font-size-xl: 1.125rem;
    /* Scale down from 20px to 18px */
  }
}

/* ── DARK MODE OVERRIDES ── */
.dark {
  --color-bg: #0f172a;
  /* slate-900 */
  --color-surface: #1e293b;
  /* slate-800 */
  --color-surface-alt: #111827;
  /* gray-900 */
  --color-border: #334155;
  /* slate-700 */
  --color-border-strong: #475569;
  /* slate-600 */
  --color-text-primary: #f1f5f9;
  /* slate-100 */
  --color-text-secondary: #94a3b8;
  /* slate-400 */
  --color-text-muted: #64748b;
  /* slate-500 */
  --color-brand-light: rgba(37, 99, 235, 0.15);
}