/* Quantum Siddhar Course — Design System */

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800&family=Plus+Jakarta+Sans:wght@400;500;600&family=Noto+Sans+Tamil:wght@400;500;600;700&display=swap');

:root {
  /* Dark theme (default) */
  --bg-primary: #0a0a1a;
  --bg-secondary: #111128;
  --bg-card: rgba(20, 20, 50, 0.6);
  --bg-glass: rgba(20, 20, 50, 0.4);
  --bg-input: rgba(30, 30, 60, 0.8);
  --border: rgba(74, 108, 247, 0.15);
  --border-hover: rgba(74, 108, 247, 0.3);

  --gold: #4A6CF7;
  --gold-dim: #3B5DE8;
  --gold-glow: rgba(74, 108, 247, 0.2);

  --text-primary: #f0f0f5;
  --text-secondary: #a0a0c0;
  --text-muted: #606080;

  --success: #34d399;
  --warning: #fbbf24;
  --danger: #f87171;
  --info: #60a5fa;

  --gradient-gold: linear-gradient(135deg, #4A6CF7, #3B5DE8);
  --gradient-dark: linear-gradient(180deg, #0a0a1a 0%, #111128 100%);
  --gradient-card: linear-gradient(135deg, rgba(74, 108, 247, 0.05), rgba(20, 20, 50, 0.8));

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-gold: 0 4px 20px rgba(74, 108, 247, 0.15);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --font-heading: 'Outfit', 'Noto Sans Tamil', sans-serif;
  --font-body: 'Plus Jakarta Sans', 'Noto Sans Tamil', sans-serif;
  --font-tamil: 'Noto Sans Tamil', sans-serif;

  --bg-nav: rgba(10, 10, 26, 0.85);

  --transition: all 0.3s ease;
}

/* Light theme — html attribute overrides :root */
html[data-theme="light"] {
  --bg-primary: #f5f5fa;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-glass: rgba(255, 255, 255, 0.7);
  --bg-input: rgba(240, 240, 250, 0.9);
  --border: rgba(0, 0, 0, 0.1);
  --border-hover: rgba(59, 93, 232, 0.4);
  --bg-nav: rgba(245, 245, 250, 0.9);

  --gold: #3B5DE8;
  --gold-dim: #2D4FD9;
  --gold-glow: rgba(59, 93, 232, 0.12);

  --text-primary: #1a1a2e;
  --text-secondary: #555570;
  --text-muted: #888898;

  --gradient-gold: linear-gradient(135deg, #3B5DE8, #2D4FD9);
  --gradient-card: linear-gradient(135deg, rgba(59, 93, 232, 0.05), rgba(255, 255, 255, 0.8));

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --shadow-gold: 0 4px 20px rgba(59, 93, 232, 0.12);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Smooth theme transition on all themed elements */
.navbar, .card, .card-glass, .card-premium, .btn, .input,
.module-icon, .lesson-item, .verse-card, .badge, .toast,
.pricing-card, .theme-toggle, .progress-bar {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
}

.tamil { font-family: var(--font-tamil); }

a { color: var(--gold); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--gold-dim); }

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.gap-4 { gap: 32px; }
.text-center { text-align: center; }
.hidden { display: none !important; }

/* Grid */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 768px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .container { padding: 0 16px; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--gold-dim); border-radius: 3px; }