/* ============================================================
   India Data Atlas — Custom CSS
   Theme: Tricolor (Saffron, White, Green)
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans:wght@300;400;600;700&family=Noto+Sans+Devanagari:wght@400;600;700&display=swap');

/* --- Root Variables --- */
:root {
  --saffron: #FF9933;
  --india-green: #138808;
  --navy-blue: #000080;
  --chakra-blue: #0000CD;
  --cream: #FFFFF0;
  --card-shadow: 0 4px 20px rgba(0,0,0,0.08);
  --card-hover: 0 8px 30px rgba(0,0,0,0.15);
}

/* --- Header Accent --- */
.md-header {
  background: linear-gradient(135deg, var(--saffron) 0%, #e67e22 100%);
  box-shadow: 0 2px 10px rgba(255,153,51,0.3);
}

/* --- Homepage Hero --- */
.hero-banner {
  background: linear-gradient(135deg, #FF9933 0%, #ffffff 50%, #138808 100%);
  padding: 60px 40px;
  text-align: center;
  border-radius: 12px;
  margin: 20px 0 40px 0;
  position: relative;
  overflow: hidden;
}

.hero-banner::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(255,255,255,0.85);
  z-index: 1;
}

.hero-banner > * { position: relative; z-index: 2; }

.hero-title {
  font-size: 2.8rem;
  font-weight: 700;
  color: #1a1a1a;
  margin: 0 0 10px 0;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: #444;
  margin-bottom: 30px;
}

/* --- Access Level Badges --- */
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.badge-easy   { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.badge-medium { background: #fff3cd; color: #856404; border: 1px solid #ffeeba; }
.badge-advanced { background: #cce5ff; color: #004085; border: 1px solid #b8daff; }
.badge-expert { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

/* --- Dataset Cards --- */
.dataset-card {
  border: 1px solid #e0e0e0;
  border-left: 5px solid var(--saffron);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 16px 0;
  background: #fff;
  box-shadow: var(--card-shadow);
  transition: all 0.2s ease;
}

.dataset-card:hover {
  box-shadow: var(--card-hover);
  transform: translateY(-2px);
  border-left-color: var(--india-green);
}

.dataset-card h3 { margin-top: 0; color: #1a1a1a; }

/* --- Info Grid --- */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin: 16px 0;
}

.info-box {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 14px 16px;
  border-top: 3px solid var(--saffron);
  text-align: center;
}

.info-box .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.5px; }
.info-box .value { font-size: 1rem; font-weight: 600; color: #333; }

/* --- Chapter Index Cards --- */
.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.chapter-card {
  background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
  border: 1px solid #e0e0e0;
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--card-shadow);
  transition: all 0.2s ease;
  text-decoration: none;
  color: inherit;
  display: block;
}

.chapter-card:hover {
  box-shadow: var(--card-hover);
  transform: translateY(-3px);
  border-color: var(--saffron);
}

.chapter-card .chapter-num {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--saffron);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.chapter-card h3 { margin: 8px 0 12px; font-size: 1.1rem; }
.chapter-card p  { font-size: 0.9rem; color: #666; margin: 0; }

/* --- Exercise / Practice Boxes --- */
.exercise-box {
  background: linear-gradient(135deg, #e8f5e9 0%, #f1f8f1 100%);
  border: 2px solid var(--india-green);
  border-radius: 10px;
  padding: 20px 24px;
  margin: 24px 0;
}

.exercise-box .ex-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--india-green);
  margin-bottom: 10px;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero-title { font-size: 2rem; }
  .chapter-grid { grid-template-columns: 1fr; }
  .info-grid { grid-template-columns: 1fr 1fr; }
}