*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --surface-2: #eef2f6;
  --ink: #18212f;
  --muted: #617085;
  --line: #d8e0ea;
  --accent: #0f6b5f;
  --accent-2: #a6402d;
  --gold: #b5851d;
  --nav: #111827;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --max-w: 1180px;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
}

body {
  margin: 0;
  background: var(--bg);
}

a {
  color: var(--accent);
  font-weight: 650;
  text-decoration: none;
}

a:hover { text-decoration: underline; }

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.nav-inner {
  max-width: var(--max-w);
  min-height: 64px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  color: var(--nav);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: .86rem;
  white-space: nowrap;
}

.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--ink); }

.hero {
  background: var(--nav);
  color: #fff;
  border-bottom: 5px solid var(--accent);
}

.hero-content {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 72px 24px 42px;
}

.term,
.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.hero .term { color: #7dd3c7; }

h1, h2, h3, p { margin-top: 0; }

h1 {
  max-width: 820px;
  margin-bottom: 18px;
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: 2rem;
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.08rem;
  line-height: 1.25;
}

.hero-copy {
  max-width: 760px;
  color: #d3dae5;
  font-size: 1.18rem;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.meta-card {
  min-height: 96px;
  padding: 16px;
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 8px;
}

.meta-label {
  display: block;
  margin-bottom: 8px;
  color: #aab6c7;
  font-family: var(--font-mono);
  font-size: .72rem;
  text-transform: uppercase;
}

.meta-card strong {
  color: #fff;
  font-size: .98rem;
}

.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 42px 24px;
}

.announcement-section { padding-bottom: 20px; }

.announcement {
  display: grid;
  grid-template-columns: minmax(240px, 360px) 1fr;
  gap: 28px;
  padding: 24px;
  background: #fff7df;
  border: 1px solid #e8cf8f;
  border-left: 6px solid var(--gold);
  border-radius: 8px;
}

.announcement h2 { margin-bottom: 0; }
.announcement p:last-child { margin-bottom: 0; }

.announcement-list {
  display: grid;
  gap: 34px;
}

.announcement-item {
  padding-top: 34px;
  margin-top: 0;
  border-top: 1px solid rgba(181, 133, 29, .35);
}

.announcement-item:first-child {
  padding-top: 0;
  border-top: 0;
}

.announcement-item + .announcement-item {
  margin-top: 10px;
}

.announcement-item h3 {
  margin-bottom: 4px;
}

.announcement-item.latest h3 {
  color: var(--accent-2);
}

.announcement-date {
  display: block;
  margin-bottom: 4px;
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 800;
  text-transform: uppercase;
}

.announcement-toggle {
  justify-self: start;
  min-height: 38px;
  margin-top: 18px;
  padding: 0;
  color: var(--accent);
  background: transparent;
  border: 0;
  border-bottom: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: .84rem;
  font-weight: 800;
  cursor: pointer;
}

.announcement-toggle:hover {
  color: var(--accent-2);
}

.overview-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, .75fr);
  gap: 28px;
  align-items: start;
}

.overview-grid p { color: var(--muted); }

.info-panel,
.content-card,
.material-card,
.assignment-row,
.staff-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.info-panel { padding: 22px; }

.info-panel ul {
  margin: 0;
  padding-left: 20px;
}

.info-panel li + li { margin-top: 8px; }

.course-tabs { padding-top: 24px; }

.tab-list {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
}

.tab-button {
  appearance: none;
  min-height: 44px;
  padding: 10px 16px;
  background: transparent;
  color: var(--muted);
  border: 0;
  border-bottom: 3px solid transparent;
  font-family: var(--font-mono);
  font-size: .88rem;
  font-weight: 700;
  cursor: pointer;
}

.tab-button.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-panel {
  display: none;
  padding-top: 20px;
}

.tab-panel.active { display: block; }

.panel-header {
  max-width: 780px;
  margin-bottom: 24px;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.syllabus-doc {
  max-width: 900px;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.syllabus-doc section + section {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.syllabus-doc h3 {
  margin-bottom: 12px;
  font-size: 1.35rem;
}

.syllabus-doc h4 {
  margin: 24px 0 10px;
  font-size: 1.05rem;
}

.syllabus-doc h5 {
  margin: 18px 0 8px;
  color: var(--accent-2);
  font-family: var(--font-mono);
  font-size: .86rem;
  text-transform: uppercase;
}

.syllabus-doc p,
.syllabus-doc li {
  color: var(--muted);
}

.syllabus-doc ul,
.syllabus-doc ol {
  margin-top: 0;
  padding-left: 24px;
}

.syllabus-doc li + li {
  margin-top: 6px;
}

.syllabus-doc blockquote {
  margin: 18px 0;
  padding: 14px 18px;
  color: var(--ink);
  background: #fff7df;
  border-left: 5px solid var(--gold);
  border-radius: 6px;
}

.source-note {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .82rem;
}

.syllabus-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 28px;
}

.syllabus-toc a {
  padding: 6px 10px;
  background: var(--surface-2);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: .78rem;
}

.content-card,
.material-card,
.staff-card {
  padding: 20px;
}

.content-card p,
.assignment-row p,
.staff-card p,
.material-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.schedule-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: .88rem;
}

.schedule-tools select {
  min-height: 38px;
  padding: 6px 10px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  font: inherit;
}

.schedule-table-wrap {
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 780px;
}

.schedule-table th,
.schedule-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.schedule-table th {
  background: var(--surface-2);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .78rem;
  text-transform: uppercase;
}

.schedule-table tr:last-child td { border-bottom: 0; }

.date-cell strong {
  display: block;
  white-space: nowrap;
}

.week-label {
  display: block;
  margin-bottom: 4px;
  color: var(--accent-2);
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 800;
  text-transform: uppercase;
}

.materials-cell,
.note-cell {
  color: var(--muted);
}

.materials-cell .material-line + .material-line {
  margin-top: 6px;
}

.materials-grid,
.staff-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.material-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: .86rem;
}

.muted { color: var(--muted); }

.assignment-list {
  display: grid;
  gap: 12px;
}

.assignment-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 18px 20px;
}

.assignment-row h3 a {
  color: var(--ink);
}

.assignment-row h3 a:hover {
  color: var(--accent);
}

.assignment-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.assignment-meta span {
  padding: 4px 8px;
  background: var(--surface-2);
  border-radius: 6px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .78rem;
}

.assignment-meta .status-open {
  color: #0f5132;
  background: #dff3e8;
}

.assignment-meta .status-closed {
  color: #842029;
  background: #f8d7da;
}

.assignment-action {
  justify-self: end;
}

.doc-page {
  background: var(--bg);
}

.doc-shell {
  max-width: 960px;
  margin: 0 auto;
  padding: 44px 24px 64px;
}

.doc-back {
  display: inline-flex;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: .86rem;
}

.assignment-doc {
  padding: 36px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.assignment-doc header {
  padding-bottom: 24px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.assignment-doc .assignment-kicker {
  margin-bottom: 8px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.assignment-doc h1 {
  color: var(--ink);
  font-size: clamp(2rem, 5vw, 3.2rem);
}

.assignment-due {
  margin-bottom: 0;
  color: var(--accent-2);
  font-family: var(--font-mono);
  font-weight: 800;
}

.assignment-doc section + section {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.assignment-doc h2 {
  font-size: 1.45rem;
}

.assignment-doc h3 {
  margin-top: 22px;
  color: var(--ink);
}

.assignment-doc p,
.assignment-doc li {
  color: var(--muted);
}

.assignment-doc ul,
.assignment-doc ol {
  padding-left: 24px;
}

.assignment-doc li + li {
  margin-top: 8px;
}

.assignment-doc pre {
  overflow-x: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  padding: 16px;
  color: #e7edf5;
  background: #111827;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: .88rem;
  line-height: 1.6;
}

.assignment-doc code {
  font-family: var(--font-mono);
}

.assignment-doc :not(pre) > code {
  padding: 2px 5px;
  color: var(--accent-2);
  background: var(--surface-2);
  border-radius: 4px;
}

.assignment-callout {
  margin: 20px 0;
  padding: 16px 18px;
  color: var(--ink);
  background: #fff7df;
  border-left: 5px solid var(--gold);
  border-radius: 6px;
}

.assignment-doc figure {
  width: fit-content;
  max-width: 100%;
  margin: 22px auto;
}

.assignment-doc img {
  display: block;
  max-width: min(100%, 720px);
  height: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.assignment-doc figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: .78rem;
  text-align: center;
}

.staff-role {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--accent-2);
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 800;
  text-transform: uppercase;
}

.footer {
  max-width: var(--max-w);
  margin: 28px auto 0;
  padding: 28px 24px 46px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .9rem;
}

.footer p { margin-bottom: 4px; }

@media (max-width: 900px) {
  .hero-meta,
  .overview-grid,
  .content-grid,
  .materials-grid,
  .staff-grid,
  .announcement {
    grid-template-columns: 1fr;
  }

  .assignment-row {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .assignment-meta { justify-content: flex-start; }
}

@media (max-width: 680px) {
  html { font-size: 16px; }

  .nav-inner {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 12px;
    padding-bottom: 12px;
    gap: 8px;
  }

  .nav-links {
    width: 100%;
    gap: 12px;
    overflow-x: auto;
  }

  .hero-content { padding-top: 48px; }
  .section { padding-left: 16px; padding-right: 16px; }
}