:root {
  --bg: #0b1024;
  --card: #121838;
  --text: #e9ecf7;
  --muted: #9aa3bf;
  --border: #243;
  --chip: #1a244a;
  --accent: #6aa1ff;
  --ok: #22c55e;
  --danger: #ff6b6b;
}

:root[data-theme='light'] {
  --bg: #f6f8ff;
  --card: #ffffff;
  --text: #0e1325;
  --muted: #515a77;
  --border: #dde3f4;
  --chip: #eef2ff;
  --accent: #355cff;
  --ok: #16a34a;
  --danger: #e11d48;
}

* {
  box-sizing: border-box
}

html,
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, system-ui, Segoe UI, Roboto, Arial, sans-serif
}

a {
  color: var(--accent);
  text-decoration: none
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 18px
}

.site-top {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border)
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center
}

.brand {
  display: flex;
  gap: 10px;
  align-items: center;
  font-weight: 700
}

.logo {
  width: 22px;
  height: 22px;
  border-radius: 8px;
  background: linear-gradient(135deg, #6aa1ff, #7c5cff)
}

.btn.ghost.mobmenu {
  color: var(--text);
}

.nav {
  display: flex;
  gap: 10px;
  align-items: center
}

.nav a {
  padding: 8px 10px;
  border-radius: 10px
}

.nav a.active,
.nav a:hover {
  background: var(--chip)
}

.sep {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 4px
}

.btn {
  background: #18224a;
  border: 1px solid var(--border);
  color: #fff;
  padding: 9px 12px;
  border-radius: 10px;
  cursor: pointer
}

.btn:hover {
  filter: brightness(1.08)
}

.btn.primary {
  background: var(--accent);
  color: #fff;
  border-color: transparent
}

.btn.ghost {
  background: transparent;
  border: 1px solid var(--border)
}

.chip {
  background: var(--chip);
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 999px
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px
}

.grid {
  display: grid;
  gap: 16px
}

.cards {
  grid-template-columns: repeat(3, minmax(0, 1fr))
}

@media(max-width:900px) {
  .cards {
    grid-template-columns: repeat(2, 1fr)
  }
}

@media(max-width:600px) {
  .cards {
    grid-template-columns: 1fr
  }
}

.badge {
  display: inline-block;
  background: var(--chip);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 8px;
  font-size: 12px;
  margin-right: 6px
}

.input,
select,
textarea {
  width: 100%;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 10px
}

.row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  border-radius: 14px
}

.table {
  width: 100%;
  border-collapse: collapse
}

.table th,
.table td {
  padding: 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  text-align: left
}

.foot {
  opacity: .7;
  padding-bottom: 36px;
  text-align: center;
}

.alert {
  background: var(--card);
  border: 1px dashed var(--border);
  padding: 12px;
  border-radius: 10px
}

/* --- Responsive header --- */
.mobmenu {
  display: none;
}

/* --- Mobile header fixes --- */
@media (max-width: 720px) {
  .topbar {
    flex-wrap: wrap;
    justify-content: center;
    text-align: center;
    gap: 8px;
    padding: 10px 8px;
  }

  .brand {
    width: 100%;
    justify-content: center;
  }

  .nav {
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
    gap: 6px;
  }

  .nav a,
  .btn {
    padding: 7px 10px;
    font-size: 14px;
  }

  .sep {
    display: none;
  }

  .mobmenu {
    display: block;
    margin-left: auto;
    font-size: 20px;
    line-height: 1;
  }

  .nav {
    display: none;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    background: var(--card);
    padding: 10px;
    border-radius: 12px;
    border: 1px solid var(--border);
    margin-top: 8px;
  }

  .nav.open {
    display: flex;
    animation: menuFade .25s ease;
  }

  @keyframes menuFade {
    from {
      opacity: 0;
      transform: translateY(-5px);
    }

    to {
      opacity: 1;
      transform: none;
    }
  }

  .topbar {
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
  }

  .brand {
    flex: 1;
    justify-content: flex-start;
  }
}

/* ---------- HOME PAGE ---------- */
.hero {
  text-align: center;
  padding: 40px 15px;
}

.hero .highlight {
  color: var(--accent);
}

.tagline {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 10px auto 0;
}

.exam-grid {
  padding: 30px 15px 60px;
}

.section-title {
  text-align: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.exam-card {
  background: var(--card);
  padding: 20px;
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  text-align: left;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.exam-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.1);
}

.exam-card h3 {
  margin-top: 0;
  color: var(--text-primary);
}

.exam-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  min-height: 50px;
}

.exam-card .btn {
  margin-top: 10px;
  display: inline-block;
}

.grid.features-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

.feature-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow);
}

.feature-item::before {
  content: '⭐';
  font-size: 40px;
  display: block;
  margin: 0 auto 15px;
  background-size: contain;
  background-repeat: no-repeat;
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  .hero {
    padding: 25px 10px;
  }

  .exam-card {
    padding: 16px;
  }
}