:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --accent: #0f766e;
  --accent-soft: #ccfbf1;
  --accent-hover: #0d9488;
  --mark: #fef08a;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
  --radius: 10px;
  --font: "Inter", system-ui, -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

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

a:hover {
  text-decoration: underline;
}

button {
  font: inherit;
  cursor: pointer;
}

.app-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.25rem;
  position: sticky;
  top: 0;
  z-index: 20;
  box-shadow: var(--shadow);
}

.app-header-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
  color: var(--accent);
}

.brand span {
  color: var(--muted);
  font-weight: 500;
}

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

.search-wrap {
  position: relative;
  flex: 1;
  min-width: 220px;
}

.search-input {
  width: 100%;
  padding: 0.65rem 0.85rem 0.65rem 2.4rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
  background: var(--bg);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.15);
  background: var(--surface);
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
  font-size: 0.95rem;
}

.hero {
  margin-bottom: 1.5rem;
}

.hero h1 {
  margin: 0 0 0.35rem;
  font-size: 1.65rem;
  letter-spacing: -0.02em;
}

.hero p {
  margin: 0;
  color: var(--muted);
}

.filters {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 1rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.85rem;
  color: var(--muted);
}

.chip.active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: #115e59;
}

.chip button {
  border: none;
  background: none;
  padding: 0;
  color: inherit;
}

.stats {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

.course-list {
  display: grid;
  gap: 0.55rem;
}

.course-row {
  display: block;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.course-row:hover {
  text-decoration: none;
  border-color: #99f6e4;
  box-shadow: var(--shadow);
}

.course-row-top {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.course-code {
  font-weight: 700;
  font-family: ui-monospace, "Cascadia Code", monospace;
  color: var(--accent);
}

.course-name {
  font-weight: 600;
}

.course-meta {
  margin-top: 0.25rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.badge {
  display: inline-block;
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-ok {
  background: #dcfce7;
  color: #166534;
}

.badge-empty {
  background: #fee2e2;
  color: #991b1b;
}

.badge-pdf {
  background: #e0e7ff;
  color: #3730a3;
}

.badge-dcp {
  background: #f1f5f9;
  color: #475569;
}

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--muted);
}

.course-header {
  margin-bottom: 1rem;
}

.course-title-row {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.course-title-row h1 {
  margin: 0;
  flex: 1;
  min-width: 0;
}

.course-info-toggle {
  flex-shrink: 0;
  margin-top: 0.35rem;
  width: 1.75rem;
  height: 1.75rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.course-info-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

.course-info-chevron {
  display: block;
  width: 0.45rem;
  height: 0.45rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.15s ease;
  margin-top: -0.15rem;
}

.course-info-toggle.is-collapsed .course-info-chevron {
  transform: rotate(-45deg);
  margin-top: 0.1rem;
  margin-left: 0.1rem;
}

.course-details .subtitle {
  margin-top: 0;
}

.course-header h1 {
  font-size: 1.75rem;
  letter-spacing: -0.02em;
}

.course-header .subtitle {
  color: var(--muted);
  margin: 0 0 1rem;
}

.course-header.is-compact {
  margin-bottom: 0.75rem;
}

.expectations-section {
  margin-top: 0;
}

.expectations-heading {
  font-size: 1.1rem;
  margin: 0 0 0.75rem;
}

body.view-course .app-header .search-wrap {
  display: none;
}

body.view-course.embed .app-header {
  display: none;
}

body.view-course .course-header {
  margin-bottom: 0.75rem;
}

body.view-course .expectations-section {
  margin-top: 0;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.meta-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.65rem 0.85rem;
}

.meta-item dt {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin: 0 0 0.15rem;
}

.meta-item dd {
  margin: 0;
  font-size: 0.92rem;
}

.prose {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.prose h2 {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.prose p {
  margin: 0;
}

.strands-toolbar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 1rem;
}

.strands-toolbar .search-wrap {
  flex: 1;
  min-width: 240px;
}

.btn-ghost {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  font-size: 0.85rem;
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.filter-hint {
  font-size: 0.82rem;
  color: var(--muted);
  margin: -0.5rem 0 1rem;
}

.filter-hint strong {
  color: var(--accent);
}

.strand-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.65rem;
  overflow: hidden;
}

.strand-block[open] {
  box-shadow: var(--shadow);
}

.strand-summary {
  list-style: none;
  cursor: pointer;
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 600;
}

.strand-summary::-webkit-details-marker {
  display: none;
}

.strand-summary::before {
  content: "▸";
  color: var(--muted);
  transition: transform 0.15s;
  flex-shrink: 0;
}

.strand-block[open] > .strand-summary::before {
  transform: rotate(90deg);
}

.strand-code {
  font-family: ui-monospace, monospace;
  color: var(--accent);
  min-width: 2rem;
}

.strand-count {
  margin-left: auto;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--muted);
}

.strand-body {
  padding: 0 1rem 0.85rem;
  border-top: 1px solid var(--border);
}

.overall-block {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-top: 0.65rem;
  overflow: hidden;
}

.overall-summary {
  list-style: none;
  cursor: pointer;
  padding: 0.65rem 0.75rem;
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
  background: #f8fafc;
}

.overall-summary::-webkit-details-marker {
  display: none;
}

.overall-summary::before {
  content: "▸";
  color: var(--muted);
  margin-top: 0.1rem;
  flex-shrink: 0;
}

.overall-block[open] > .overall-summary::before {
  content: "▾";
}

.overall-code {
  font-family: ui-monospace, monospace;
  font-weight: 700;
  color: #334155;
  flex-shrink: 0;
}

.overall-text {
  font-size: 0.9rem;
}

.overall-body {
  padding: 0.35rem 0.75rem 0.65rem 2rem;
}

.spec-row {
  display: flex;
  gap: 0.6rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid #f1f5f9;
  font-size: 0.88rem;
}

.spec-row:last-child {
  border-bottom: none;
}

.spec-code {
  font-family: ui-monospace, monospace;
  font-weight: 600;
  color: var(--accent);
  flex-shrink: 0;
  min-width: 3.2rem;
}

mark {
  background: var(--mark);
  padding: 0 0.1em;
  border-radius: 2px;
}

.loading {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--muted);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  color: var(--muted);
}

.back-link:hover {
  color: var(--accent);
}

@media (max-width: 600px) {
  .strand-summary {
    flex-wrap: wrap;
  }

  .strand-count {
    margin-left: 2rem;
    width: 100%;
  }
}

body.embed .back-link {
  display: none;
}

body.embed .app-header {
  padding: 0.5rem 1rem;
}

body.embed .page {
  padding-top: 0.5rem;
}

.strand-title-wrap {
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  min-width: 0;
}

.strand-title-text {
  display: inline-block;
  max-width: min(100%, 28rem);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  vertical-align: bottom;
}

.strand-title-expand {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.75rem;
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
}