/* ============================================================
   MITRA — Design Tokens
   Zalo-inspired Vietnamese Chat App
   ============================================================ */

:root {
  /* ── Brand Colors ─────────────────────────────────────── */
  --brand-primary: #0068FF;
  --brand-primary-light: #4d9dff;
  --brand-primary-dark: #0050cc;
  --brand-primary-alpha: rgba(0, 104, 255, 0.12);

  --brand-secondary: #00C6FF;
  --brand-gradient: linear-gradient(135deg, #0068FF 0%, #00C6FF 100%);
  --brand-gradient-soft: linear-gradient(135deg, rgba(0,104,255,0.15) 0%, rgba(0,198,255,0.15) 100%);

  /* ── Semantic Colors ──────────────────────────────────── */
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #3b82f6;

  /* ── Online Status ────────────────────────────────────── */
  --color-online: #22c55e;
  --color-away: #f59e0b;
  --color-offline: #6b7280;

  /* ── Typography ───────────────────────────────────────── */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 11px;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-md: 15px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 22px;
  --font-size-3xl: 28px;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* ── Spacing ──────────────────────────────────────────── */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* ── Border Radius ────────────────────────────────────── */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* ── Transitions ──────────────────────────────────────── */
  --transition-fast: 120ms ease;
  --transition-base: 220ms ease;
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* ── Z-index ──────────────────────────────────────────── */
  --z-below: -1;
  --z-base: 0;
  --z-raised: 10;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 300;
  --z-toast: 400;
  --z-top: 500;

  /* ── Layout ───────────────────────────────────────────── */
  --bottom-nav-height: 60px;
  --header-height: 56px;
  --sidebar-width: 72px;
  --chat-list-width: 320px;
}

/* ── LIGHT THEME ────────────────────────────────────────── */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f4f6fb;
  --bg-tertiary: #eef0f5;
  --bg-hover: rgba(0, 0, 0, 0.04);
  --bg-active: rgba(0, 104, 255, 0.08);
  --bg-glass: rgba(255, 255, 255, 0.8);
  --bg-overlay: rgba(0, 0, 0, 0.4);

  --bg-bubble-sent: #0068FF;
  --bg-bubble-received: #f0f2f5;
  --text-bubble-sent: #ffffff;
  --text-bubble-received: #1a1a2e;

  --text-primary: #1a1a2e;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --text-inverse: #ffffff;
  --text-link: #0068FF;

  --border-color: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.15);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12), 0 4px 8px rgba(0,0,0,0.06);
  --shadow-xl: 0 24px 64px rgba(0,0,0,0.15);
  --shadow-brand: 0 4px 20px rgba(0, 104, 255, 0.35);

  --scrollbar-track: #f1f5f9;
  --scrollbar-thumb: #cbd5e1;
}

/* ── DARK THEME ─────────────────────────────────────────── */
[data-theme="dark"] {
  --bg-primary: #0f1117;
  --bg-secondary: #171b24;
  --bg-tertiary: #1e2330;
  --bg-hover: rgba(255, 255, 255, 0.05);
  --bg-active: rgba(0, 104, 255, 0.15);
  --bg-glass: rgba(15, 17, 23, 0.85);
  --bg-overlay: rgba(0, 0, 0, 0.6);

  --bg-bubble-sent: #0068FF;
  --bg-bubble-received: #1e2330;
  --text-bubble-sent: #ffffff;
  --text-bubble-received: #e8eaf0;

  --text-primary: #e8eaf0;
  --text-secondary: #8b95a8;
  --text-tertiary: #5a6478;
  --text-inverse: #0f1117;
  --text-link: #4d9dff;

  --border-color: rgba(255, 255, 255, 0.07);
  --border-strong: rgba(255, 255, 255, 0.12);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4), 0 2px 4px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5), 0 4px 8px rgba(0,0,0,0.3);
  --shadow-xl: 0 24px 64px rgba(0,0,0,0.6);
  --shadow-brand: 0 4px 20px rgba(0, 104, 255, 0.4);

  --scrollbar-track: #1e2330;
  --scrollbar-thumb: #2d3748;
}