:root {
  color-scheme: light;
  --bg: #f8f9fb;
  --surface: #ffffff;
  --surface-muted: #f3f4f6;
  --text: #111827;
  --muted: #667085;
  --line: #e5e7eb;
  --line-strong: #d0d5dd;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: #eff6ff;
  --success: #067647;
  --danger: #b42318;
  --radius: 8px;
  --container: 1120px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #09090b;
  --surface: #111113;
  --surface-muted: #18181b;
  --text: #fafafa;
  --muted: #a1a1aa;
  --line: #27272a;
  --line-strong: #3f3f46;
  --accent: #60a5fa;
  --accent-hover: #93c5fd;
  --accent-soft: #172554;
  --success: #6ce9a6;
  --danger: #fda29b;
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #09090b;
    --surface: #111113;
    --surface-muted: #18181b;
    --text: #fafafa;
    --muted: #a1a1aa;
    --line: #27272a;
    --line-strong: #3f3f46;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --accent-soft: #172554;
    --success: #6ce9a6;
    --danger: #fda29b;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
h1, h2, h3, p { margin-top: 0; }
.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }
.narrow { max-width: 760px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.header-inner { min-height: 64px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 750; letter-spacing: -.02em; }
.brand-mark {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: var(--surface);
  font-size: .78rem;
  font-weight: 800;
}
.main-nav { margin-left: auto; display: flex; align-items: center; gap: 22px; }
.main-nav a { color: var(--muted); font-size: .9rem; font-weight: 550; }
.main-nav a:hover { color: var(--text); }
.header-actions { display: flex; gap: 8px; align-items: center; }
.menu-button, .theme-toggle {
  min-height: 36px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 7px;
  cursor: pointer;
}
.theme-toggle { width: 36px; display: grid; place-items: center; }
.menu-button { display: none; padding: 7px 12px; }
.menu-button:hover, .theme-toggle:hover { border-color: var(--line-strong); background: var(--surface-muted); }

.hero { padding: 80px 0 64px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 64px; align-items: start; }
.eyebrow { color: var(--muted); text-transform: uppercase; letter-spacing: .12em; font-size: .72rem; font-weight: 700; }
.hero h1, .page-hero h1 {
  margin: 14px 0 18px;
  max-width: 800px;
  font-size: clamp(2.7rem, 6vw, 5.2rem);
  line-height: 1.02;
  letter-spacing: -.055em;
  font-weight: 750;
}
.hero h1 em { color: inherit; font-style: normal; font-weight: inherit; }
.hero p, .page-hero p { max-width: 650px; color: var(--muted); font-size: 1.08rem; }
.hero-actions, .contact-buttons { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 9px 15px;
  border: 1px solid transparent;
  border-radius: 7px;
  font-weight: 650;
  cursor: pointer;
  transition: background .14s ease, border-color .14s ease, color .14s ease;
}
.button.primary { background: var(--accent); color: #fff; }
.button.primary:hover { background: var(--accent-hover); }
.button.ghost { border-color: var(--line); background: var(--surface); color: var(--text); }
.button.ghost:hover { border-color: var(--line-strong); background: var(--surface-muted); }
.button.wide { width: 100%; }

.hero-card {
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.hero-stat strong { display: block; font-size: 1.65rem; line-height: 1; letter-spacing: -.03em; }
.hero-stat span { color: var(--muted); font-size: .84rem; }
.hero-card p { grid-column: 1/-1; margin: 0; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }

.section { padding: 64px 0; }
.section + .section { border-top: 1px solid var(--line); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 32px; margin-bottom: 24px; }
.section-heading h2 { margin: 8px 0 0; font-size: clamp(1.8rem, 4vw, 2.7rem); line-height: 1.1; letter-spacing: -.04em; }
.section-heading > p { margin: 0; max-width: 420px; color: var(--muted); }
.course-grid { display: grid; grid-template-columns: 1fr; border-top: 1px solid var(--line); }
.course-card {
  min-height: 96px;
  padding: 20px 4px;
  display: grid;
  grid-template-columns: 88px 1fr auto;
  align-items: center;
  gap: 20px;
  border-bottom: 1px solid var(--line);
  transition: background .14s ease;
}
.course-card:hover { background: var(--surface); }
.course-number { color: var(--muted); font-size: .78rem; font-weight: 650; letter-spacing: .08em; }
.course-card h3 { margin: 0 0 3px; font-size: 1.08rem; font-weight: 650; }
.course-card p { margin: 0; color: var(--muted); font-size: .9rem; }
.card-link { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: .9rem; }
.card-link b { color: var(--text); font-size: 1.1rem; transition: transform .14s ease; }
.course-card:hover .card-link b { transform: translateX(3px); }

.news-section { background: var(--surface); }
.news-list { border-top: 1px solid var(--line); }
.news-card { display: grid; grid-template-columns: 132px minmax(0,1fr); gap: 28px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.news-card time { color: var(--muted); font-size: .86rem; font-variant-numeric: tabular-nums; }
.news-card h3 { margin-bottom: 6px; font-size: 1rem; font-weight: 650; }
.news-card p { margin: 0; max-width: 780px; color: var(--muted); }
.empty-state { padding: 24px 0; color: var(--muted); border-bottom: 1px solid var(--line); }


.section-link { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-size: .9rem; font-weight: 600; }
.section-link:hover { color: var(--text); }
.section-link span { transition: transform .14s ease; }
.section-link:hover span { transform: translateX(3px); }
.compact-page-hero h1 { max-width: 720px; }
.news-summary { display: flex; justify-content: space-between; gap: 20px; margin-bottom: 14px; color: var(--muted); font-size: .84rem; }
.news-section .news-card h2 { margin-bottom: 6px; font-size: 1rem; font-weight: 650; }
.pagination { display: grid; grid-template-columns: minmax(96px, 1fr) auto minmax(96px, 1fr); align-items: center; gap: 18px; margin-top: 28px; }
.pagination-control { color: var(--muted); font-size: .88rem; font-weight: 600; }
.pagination-control:last-child { justify-self: end; }
.pagination-control:hover { color: var(--text); }
.pagination-control.disabled { opacity: .45; cursor: default; }
.pagination-pages { display: flex; align-items: center; justify-content: center; gap: 4px; }
.pagination-pages a { min-width: 34px; height: 34px; padding: 0 8px; display: inline-grid; place-items: center; border: 1px solid transparent; border-radius: 7px; color: var(--muted); font-size: .86rem; font-variant-numeric: tabular-nums; }
.pagination-pages a:hover { border-color: var(--line); background: var(--surface-muted); color: var(--text); }
.pagination-pages a.active { border-color: var(--line-strong); background: var(--surface); color: var(--text); font-weight: 700; }
.pagination-ellipsis { min-width: 28px; text-align: center; color: var(--muted); }

.page-hero { padding: 64px 0 48px; border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(2.6rem, 7vw, 4.8rem); }
.back-link { display: inline-flex; margin-bottom: 24px; color: var(--muted); font-size: .9rem; }
.back-link:hover { color: var(--text); }
.semester-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; }
.semester-card {
  min-height: 270px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.semester-icon { position: absolute; top: 22px; right: 22px; color: var(--muted); }
.semester-label { color: var(--muted); text-transform: uppercase; letter-spacing: .1em; font-size: .7rem; font-weight: 700; }
.semester-card h2 { margin: 16px 0 10px; font-size: 1.5rem; letter-spacing: -.03em; }
.semester-card p { color: var(--muted); }
.semester-card .button { margin-top: auto; }
.support-card { padding: 28px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.support-card h2 { margin: 10px 0; font-size: 1.6rem; }
.support-card p { margin-bottom: 0; color: var(--muted); }

.site-footer { padding: 48px 0 24px; border-top: 1px solid var(--line); background: var(--surface); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; }
.footer-brand { margin-bottom: 14px; }
.footer-grid p { max-width: 340px; color: var(--muted); }
.footer-grid > div { display: flex; flex-direction: column; align-items: flex-start; gap: 9px; }
.footer-grid strong { font-size: .88rem; }
.footer-grid a:not(.brand) { color: var(--muted); font-size: .9rem; }
.footer-grid a:hover { color: var(--text); }
.copyright { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: .84rem; }

.admin-body { background: var(--bg); }
.admin-header {
  min-height: 64px;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.admin-header-actions, .admin-header nav { display: flex; align-items: center; gap: 18px; }
.admin-header form { margin: 0; }
.link-button, .danger-link { border: 0; background: none; padding: 0; cursor: pointer; }
.link-button { color: var(--muted); }
.danger-link { color: var(--danger); }
.admin-main { width: min(calc(100% - 40px), 1040px); margin: 48px auto; }
.auth-card, .editor-card, .admin-table-wrap { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.auth-card { width: min(100%, 420px); margin: 72px auto; padding: 28px; }
.auth-card h1 { margin: 8px 0 24px; font-size: 2rem; letter-spacing: -.04em; }
.form-stack { display: grid; gap: 18px; }
.form-stack label { display: grid; gap: 7px; font-size: .9rem; font-weight: 600; }
.form-stack input, .form-stack textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--bg);
  color: var(--text);
}
.form-stack input:focus, .form-stack textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 22%, transparent); border-color: var(--accent); }
.checkbox { display: flex !important; grid-template-columns: auto 1fr !important; align-items: center; }
.checkbox input { width: auto; }
.alert { margin-bottom: 18px; padding: 11px 13px; border: 1px solid color-mix(in srgb, var(--danger) 28%, var(--line)); border-radius: 7px; }
.alert.error { background: color-mix(in srgb, var(--danger) 8%, var(--surface)); color: var(--danger); }
.admin-page-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 22px; }
.admin-page-heading h1 { margin: 6px 0 0; font-size: 2rem; letter-spacing: -.04em; }
.admin-table-wrap { overflow: hidden; }
.admin-table { width: 100%; border-collapse: collapse; }
.admin-table th, .admin-table td { padding: 16px 18px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
.admin-table th { color: var(--muted); font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; }
.admin-table tbody tr:last-child td { border-bottom: 0; }
.admin-table tbody tr:hover { background: var(--surface-muted); }
.admin-table small { display: block; margin-top: 4px; color: var(--muted); }
.actions { display: flex; gap: 14px; }
.actions form { margin: 0; }
.status { display: inline-flex; padding: 3px 8px; border-radius: 999px; font-size: .74rem; font-weight: 650; }
.status.published { background: color-mix(in srgb, var(--success) 12%, var(--surface)); color: var(--success); }
.status.draft { background: var(--surface-muted); color: var(--muted); }
.editor-card { padding: 26px; }
.editor-card textarea { resize: vertical; }
.editor-card .button { justify-self: start; }

@media (max-width: 900px) {
  .main-nav { position: absolute; top: 64px; left: 20px; right: 20px; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 8px 14px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 11px 0; border-bottom: 1px solid var(--line); }
  .main-nav a:last-child { border-bottom: 0; }
  .menu-button { display: block; }
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-card { max-width: 420px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > div:first-child { grid-column: 1/-1; }
}

@media (max-width: 640px) {
  .container, .admin-main { width: min(calc(100% - 28px), var(--container)); }
  .header-inner { gap: 10px; }
  .brand span:last-child { display: none; }
  .header-actions { margin-left: auto; }
  .hero { padding: 56px 0 46px; }
  .hero h1, .page-hero h1 { font-size: clamp(2.5rem, 14vw, 3.8rem); }
  .section { padding: 50px 0; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 12px; }
  .course-card { grid-template-columns: 62px 1fr auto; gap: 12px; }
  .card-link span { display: none; }
  .news-card { grid-template-columns: 1fr; gap: 6px; }
  .news-summary { display: block; }
  .news-summary span { display: block; }
  .news-summary span + span { margin-top: 4px; }
  .pagination { grid-template-columns: 1fr 1fr; gap: 18px; }
  .pagination-pages { grid-column: 1/-1; grid-row: 1; }
  .pagination-control { grid-row: 2; }
  .pagination-control:last-child { justify-self: end; }
  .semester-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-grid > div:first-child { grid-column: auto; }
  .admin-page-heading { flex-direction: column; align-items: flex-start; }
  .admin-table-wrap { overflow-x: auto; }
  .admin-table { min-width: 700px; }
  .auth-card { margin: 28px auto; padding: 24px; }
  .admin-header { padding-inline: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}