:root {
  --blue: #1382cf;
  --blue-dark: #0e6bb0;
  --blue-active: #0f74bd;
  --red: #e5384d;
  --text-dark: #2b2b2b;
  --text-body: #3f3f46;
  --border: #e4e7eb;
  --bg-page: #f4f5f7;
  --bg-white: #ffffff;
  --link-blue: #1b62c4;
  --radius: 6px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-dark);
  background: var(--bg-page);
}

a { color: var(--link-blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Top bar ---------- */
.topbar {
  background: var(--blue);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
}

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

.logo-mark {
  width: 40px;
  height: 40px;
  display: block;
  flex-shrink: 0;
}

.logo-text {
  color: #fff;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.2px;
  font-family: 'Montserrat', -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.topnav { display: flex; gap: 6px; }

.topnav a {
  color: #eaf4ff;
  padding: 9px 16px;
  border-radius: var(--radius);
  font-size: 14.5px;
  font-weight: 500;
}
.topnav a:hover { background: rgba(255,255,255,0.12); text-decoration: none; }
.topnav a.active { background: var(--blue-active); color: #fff; }

/* ---------- Layout ---------- */
.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 24px 60px;
}

.layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 28px;
  align-items: start;
}

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
}

.main-col, .side-col > div {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.main-col { padding: 32px; }

.main-col h1 {
  font-size: 32px;
  margin: 0 0 18px;
  font-weight: 800;
}

.main-col h2 {
  font-size: 23px;
  margin: 0 0 14px;
  font-weight: 700;
}

.main-col p.intro {
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-body);
  margin: 0 0 26px;
}

.section-heading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 26px 0 14px;
}

.section-heading h3, h3.section-heading-plain {
  font-size: 19px;
  font-weight: 700;
  margin: 26px 0 14px;
}

.section-heading h3 { margin: 0; }

.badge-new {
  background: var(--red);
  color: #fff;
  font-size: 11.5px;
  font-weight: 700;
  padding: 4px 9px;
  border-radius: 4px;
  flex-shrink: 0;
}

.note-quote {
  border-left: 3px solid var(--border);
  background: #fafbfc;
  padding: 14px 20px;
  font-style: italic;
  color: var(--text-body);
  margin: 20px 0 26px;
  font-size: 14.5px;
}

table.subject-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  margin-bottom: 8px;
}

table.subject-table th {
  text-align: left;
  padding: 12px 14px;
  border: 1px solid var(--border);
  background: #fafbfc;
  font-weight: 700;
}

table.subject-table td {
  padding: 12px 14px;
  border: 1px solid var(--border);
}

/* ---------- Sidebar ---------- */
.side-col { display: flex; flex-direction: column; gap: 20px; }

.promo-card {
  background: linear-gradient(160deg, var(--blue) 0%, var(--blue-dark) 100%);
  color: #fff;
  padding: 22px;
  text-align: center;
}

.promo-badge {
  display: inline-block;
  background: rgba(255,255,255,0.15);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.promo-tag { font-size: 11.5px; opacity: 0.85; margin: 8px 0 16px; }

.promo-card h4 {
  font-size: 24px;
  line-height: 1.25;
  margin: 0 0 18px;
  font-weight: 800;
}

.promo-card h4 span { font-size: 30px; }

.promo-btn {
  background: #fff;
  color: var(--blue-dark);
  border: none;
  padding: 10px 18px;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
}

.promo-rating { margin: 12px 0 0; font-size: 13px; opacity: 0.9; }

.list-card { padding: 20px; }

.list-card h4 { font-size: 17px; margin: 0 0 10px; font-weight: 700; }

.list-card .list-title {
  font-size: 14px;
  font-weight: 600;
  margin: 10px 0 12px;
  line-height: 1.4;
}

.list-card ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.list-card ul a { font-size: 14.5px; font-weight: 500; }

/* ---------- Placeholder subject pages ---------- */
.placeholder-box {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 40px;
  text-align: center;
}

.placeholder-box h1 { font-size: 26px; margin: 0 0 12px; }
.placeholder-box p { color: var(--text-body); font-size: 15px; margin: 0 0 20px; }

.back-link { display: inline-block; margin-top: 6px; font-weight: 600; }

table.subject-table td.unit-no {
  width: 60px;
  text-align: center;
  font-weight: 700;
  color: var(--blue-dark);
}

table.subject-table td.unit-name {
  width: 220px;
  font-weight: 700;
}

table.subject-table td.syllabus-topics {
  color: var(--text-body);
}

/* ---------- Footer ---------- */
.site-footer {
  background: #fff;
  border-top: 1px solid var(--border);
  margin-top: 44px;
}

.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 22px 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 13.5px;
  color: var(--text-body);
}

.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a { color: var(--text-body); font-weight: 500; }
.footer-links a:hover { color: var(--blue); }

.legal-page {
  max-width: 780px;
  margin: 0 auto;
  padding: 36px;
}

.legal-page h1 { font-size: 27px; margin: 0 0 8px; }
.legal-page .updated { color: #8a8f98; font-size: 13px; margin: 0 0 26px; }
.legal-page h2 { font-size: 18px; margin: 28px 0 10px; }
.legal-page p, .legal-page li { font-size: 14.5px; line-height: 1.7; color: var(--text-body); }
.legal-page ul { padding-left: 20px; margin: 8px 0; }
.legal-page a { font-weight: 600; }