/* Minga theme on Bootstrap 5 — Google Cloud Console-inspired: full-width white
   app bar, #f8f9fa canvas, flat white cards with #dadce0 hairlines and 8px
   radii (elevation on hover only), Google Blue #1a73e8 as the single accent,
   Roboto with medium-weight headings, dense sentence-case tables, and tinted
   status chips for categorical color. */

:root {
  /* type scale (GCC density: 12/13/14px steps) */
  --fs-2xs: 0.75rem;
  --fs-xs: 0.8125rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.0625rem;
  --fs-xl: 1.5rem;
  --fs-display: 2.75rem;

  --ink: #202124;
  --ink-2: #5f6368;
  --ink-3: #80868b;
  --accent: #1a73e8;
  --accent-hover: #1765cc;
  --border: #dadce0;
  --surface: #fff;
  --canvas: #f8f9fa;

  --radius-lg: 8px;
  --radius-md: 8px;
  --radius-sm: 4px;
  --elev-1: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);

  --font-display: 'Google Sans', 'Roboto', system-ui, sans-serif;
  --bs-body-font-family: 'Roboto', system-ui, sans-serif;
  --bs-body-color: #202124;
  --bs-link-color: #1a73e8;
  --bs-link-color-rgb: 26, 115, 232;
  --bs-link-hover-color: #1765cc;
  --bs-link-hover-color-rgb: 23, 101, 204;
}

html { min-height: 100%; }
body { background: var(--canvas); min-height: 100%; }
body.app-frame {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
}
a { text-decoration: none; }
a:hover { text-decoration: none; }
b, strong { font-weight: 500; }

/* full-width app bar */
.app-bar {
  position: sticky; top: 0; z-index: 1020;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.app-bar-inner {
  display: flex; align-items: center; gap: 1rem;
  padding: 0.6rem 1.5rem;
}
.brand { font-family: var(--font-display); font-weight: 500; font-size: 1.2rem; color: var(--ink-2) !important; }
.brand:hover { color: var(--accent) !important; }
.nav-mini { font-size: var(--fs-sm); font-weight: 500; color: var(--ink-2); }
.nav-mini:hover { color: var(--accent); }

.app-body {
  width: 100%;
  flex: 1 0 auto;
  display: flex;
  align-items: stretch;
}
.page-shell {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3.5rem;
  flex: 1 0 auto;
}
.has-sidebar .page-shell {
  max-width: 1180px;
  margin: 0 auto;
}
.content-frame { min-height: 100%; }
.course-sidebar {
  flex: 0 0 232px;
  width: 232px;
  padding: 1rem 0.75rem;
  background: var(--surface);
  border-right: 1px solid var(--border);
}
.course-sidebar-head {
  padding: 0.35rem 0.6rem 0.85rem;
  border-bottom: 1px solid #e8eaed;
  margin-bottom: 0.65rem;
}
.course-sidebar-code {
  display: block;
  color: var(--ink);
  font-weight: 500;
  line-height: 1.25;
}
.course-sidebar-term {
  display: block;
  margin-top: 0.15rem;
  color: var(--ink-2);
  font-size: var(--fs-xs);
}
.course-sidebar-nav {
  display: grid;
  gap: 0.15rem;
}
.sidebar-link {
  display: flex;
  align-items: center;
  min-height: 2.1rem;
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  color: var(--ink-2);
  font-size: var(--fs-sm);
  font-weight: 500;
}
.sidebar-link:hover {
  color: var(--ink);
  background: #f1f3f4;
}
.sidebar-link.active {
  color: #1967d2;
  background: #e8f0fe;
}
.sidebar-section {
  margin: 0.85rem 0.65rem 0.25rem;
  color: var(--ink-3);
  font-size: var(--fs-2xs);
  font-weight: 500;
}

h1 { font-family: var(--font-display); font-weight: 500; font-size: var(--fs-xl); color: var(--ink); margin: 1.4rem 0 0.6rem; }
h2, .section h4 { font-family: var(--font-display); font-size: var(--fs-base); font-weight: 500; color: var(--ink); margin: 1.4rem 0 0.7rem; }
.muted { color: var(--ink-2); }

/* micro-labels: 12px medium gray, sentence case (GCC table-header style) */
.masthead-kicker, .term-label, .side-label, .table thead th {
  font-size: var(--fs-2xs); font-weight: 500;
  letter-spacing: 0.02em; text-transform: none;
}

/* surfaces: flat, hairline-bordered */
.card { border: 1px solid var(--border); border-radius: var(--radius-md); box-shadow: none; }
.alert { border-radius: var(--radius-md); }
.badge { border-radius: 999px; font-weight: 500; }
.badge.text-bg-warning { background: #fef7e0 !important; color: #b06000; }
.badge.text-bg-light { background: #fff !important; border-color: var(--border) !important; color: var(--ink-2) !important; }
.btn {
  border-radius: var(--radius-sm);
  font-weight: 500;
  letter-spacing: 0.015em;
  white-space: nowrap;
}
.btn:not(.btn-link) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 2.25rem;
  min-width: 4.5rem;
}
.btn-sm:not(.btn-link) {
  min-height: 2rem;
  min-width: 3.75rem;
}
.btn-primary {
  --bs-btn-bg: #1a73e8; --bs-btn-border-color: #1a73e8;
  --bs-btn-hover-bg: #1765cc; --bs-btn-hover-border-color: #1765cc;
  --bs-btn-active-bg: #185abc; --bs-btn-active-border-color: #185abc;
  --bs-btn-disabled-bg: #a8c7fa; --bs-btn-disabled-border-color: #a8c7fa;
}
.form-control, .form-select {
  border-radius: var(--radius-sm);
  border-color: var(--border);
  background-color: var(--surface);
}
.form-control:focus, .form-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.18);
}
.form-label {
  font-size: var(--fs-xs);
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 0.35rem;
}
.field-help {
  display: block;
  margin-top: 0.35rem;
  color: var(--ink-2);
  font-size: var(--fs-xs);
}

/* shared app primitives */
.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin: 0 0 1rem;
}
.page-header-main { min-width: 0; }
.page-kicker {
  margin: 0 0 0.25rem;
  font-size: var(--fs-xs);
  color: var(--ink-2);
}
.page-kicker a { font-weight: 500; }
.page-title {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 500;
  line-height: 1.25;
  color: var(--ink);
  margin: 0;
}
.page-subtitle {
  margin: 0.35rem 0 0;
  color: var(--ink-2);
  font-size: var(--fs-sm);
}
.page-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.toolbar {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
  margin: 0 0 1rem;
}
.toolbar .form-control,
.toolbar .form-select { width: auto; }
.toolbar-search { min-width: 16rem; max-width: 24rem; }
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.panel-body { padding: 1rem 1.15rem; }
.panel-section + .panel-section { border-top: 1px solid #e8eaed; }
.status-strip {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.status-chip {
  display: inline-flex;
  align-items: center;
  min-height: 1.4rem;
  padding: 0.15rem 0.65rem;
  border-radius: 999px;
  font-size: var(--fs-2xs);
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
}
.status-blue { color: #1967d2; background: #e8f0fe; }
.status-info { color: #129eaf; background: #e4f7fb; }
.status-green { color: #137333; background: #e6f4ea; }
.status-amber { color: #b06000; background: #fef7e0; }
.status-red { color: #c5221f; background: #fce8e6; }
.status-purple { color: #8430ce; background: #f3e8fd; }
.status-gray { color: var(--ink-2); background: #f1f3f4; }
.status-outline {
  color: var(--ink-2);
  background: var(--surface);
  border: 1px solid var(--border);
}
.meta-line {
  color: var(--ink-2);
  font-size: var(--fs-xs);
}
.action-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.action-row-end { margin-left: auto; }
.form-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
}
.form-row {
  display: flex;
  align-items: flex-end;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.form-row > * { min-width: 0; }
.placeholder-frame {
  min-height: 15rem;
  background: var(--surface);
  border: 1px dashed #cfd1d4;
  border-radius: var(--radius-md);
  overflow: hidden;
}
.placeholder-row {
  display: grid;
  grid-template-columns: 7rem 1fr 10rem;
  gap: 1rem;
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid #eef0f2;
}
.placeholder-row:last-child { border-bottom: 0; }
.placeholder-line {
  height: 0.75rem;
  border-radius: 999px;
  background: #eef0f2;
}
.table-shell {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow-x: auto;
}
.table-shell .table {
  border: 0;
  border-radius: 0;
  margin-bottom: 0;
}
.table-title {
  font-weight: 500;
  color: var(--ink);
}
.table-subtext {
  display: block;
  margin-top: 0.2rem;
  color: var(--ink-2);
  font-size: var(--fs-xs);
}
.meta-list {
  display: grid;
  gap: 0.65rem;
  margin: 0;
}
.meta-list div {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr);
  gap: 0.75rem;
}
.meta-list dt {
  color: var(--ink-2);
  font-size: var(--fs-xs);
  font-weight: 500;
}
.meta-list dd {
  margin: 0;
  color: var(--ink);
  font-size: var(--fs-xs);
  overflow-wrap: anywhere;
}
.section-title {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: var(--fs-base);
  font-weight: 500;
  color: var(--ink);
}
.detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 20rem;
  gap: 1rem;
  align-items: start;
}
.detail-main,
.detail-side {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}
.empty-note {
  padding: 1rem 1.15rem;
  color: var(--ink-2);
  font-size: var(--fs-sm);
}
.num-cell {
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.grade-table th:not(:first-child),
.grade-table td:not(:first-child) {
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.grade-table th:first-child,
.grade-table td:first-child {
  position: sticky;
  left: 0;
  z-index: 1;
  background: var(--surface);
}
.grade-table thead th:first-child { z-index: 2; }
.compact-edit-row {
  display: grid;
  grid-template-columns: minmax(9rem, 1fr) 5.5rem 4.5rem auto auto;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.5rem;
}
.compact-edit-row-4 {
  grid-template-columns: minmax(10rem, 1fr) minmax(8rem, auto) auto auto;
}
.compact-edit-row:last-child { margin-bottom: 0; }
.readonly-field {
  display: flex;
  align-items: center;
  min-height: 2rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid #e8eaed;
  border-radius: var(--radius-sm);
  background: #f8f9fa;
  color: var(--ink);
  font-size: var(--fs-xs);
}
.person-cell {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}
.person-cell-main {
  min-width: 0;
}
.person-name {
  display: block;
  font-weight: 500;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
}
.person-meta {
  display: block;
  color: var(--ink-2);
  font-size: var(--fs-xs);
  overflow-wrap: anywhere;
}
.directory-list {
  display: grid;
  gap: 0.65rem;
}
.directory-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid #e8eaed;
}
.directory-item:last-child { border-bottom: 0; }
.identity-panel {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.identity-avatar,
.identity-panel .avatar-fallback,
.identity-panel .avatar {
  width: 56px;
  height: 56px;
  font-size: var(--fs-base);
}
.action-tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.85rem;
}
.action-tile {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.8rem;
  align-items: start;
  padding: 1rem;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.action-tile:hover {
  background: #f8f9fa;
  border-color: #cfd1d4;
  box-shadow: var(--elev-1);
}
.action-tile-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  color: #1967d2;
  background: #e8f0fe;
  font-size: var(--fs-xs);
  font-weight: 700;
}
.action-tile-title {
  display: block;
  color: var(--ink);
  font-weight: 500;
}
.action-tile-meta {
  display: block;
  margin-top: 0.15rem;
  color: var(--ink-2);
  font-size: var(--fs-xs);
}
.schedule-title {
  display: block;
  font-weight: 500;
  color: var(--ink);
}
.schedule-notes {
  margin-top: 0.2rem;
  color: var(--ink-2);
  font-size: var(--fs-xs);
}
.material-list {
  list-style: none;
  margin: 0.55rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}
.material-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid #e8eaed;
  border-radius: var(--radius-sm);
  background: #f8f9fa;
}
.inline-edit-row {
  display: grid;
  grid-template-columns: 9rem 8rem minmax(12rem, 1fr) minmax(10rem, 0.8fr) minmax(10rem, 0.8fr) auto auto;
  gap: 0.5rem;
  align-items: center;
}

/* dense data tables */
.table {
  font-size: var(--fs-xs);
  border-collapse: separate; border-spacing: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  --bs-table-striped-bg: rgba(0, 0, 0, 0.015);
  --bs-table-hover-bg: #f8f9fa;
}
.table thead th {
  background: var(--surface); border-bottom: 1px solid var(--border);
  color: var(--ink-2); padding: 0.7rem 1rem;
}
.table td { padding: 0.65rem 1rem; border-bottom: 1px solid #e8eaed; }
.table tbody tr:last-child td { border-bottom: 0; }

details {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 0.8rem 1.1rem; margin-bottom: 0.9rem;
}
details summary { cursor: pointer; font-weight: 500; font-size: var(--fs-sm); color: var(--ink-2); }
details[open] summary { margin-bottom: 0.6rem; }
.list-group-flush {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 0.35rem 1.25rem;
}

/* ------- public course page ------- */

.course-header, .section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  margin: 1rem 0 1.25rem;
}
.course-header {
  border-color: transparent;
  background: transparent;
  padding: 1rem 0 0.5rem;
  margin: 0 0 1rem;
}
.section h4 { margin-top: 0; }
.section .table { border: 0; border-radius: 0; }
.course-title { font-family: var(--font-display); font-size: 1.85rem; line-height: 1.18; font-weight: 500; color: var(--ink); margin: 0.2rem 0 0.75rem; }
.course-title .term { color: var(--ink-2); font-size: 0.75em; font-weight: 400; }
.header-text { font-size: 0.92em; }
.section-text { font-size: 0.92em; color: #3c4043; }
.course-header { display: flex; gap: 1rem; align-items: flex-start; }
.course-header .head-left { flex: 1; }
.course-header .head-right img { width: 150px; margin-top: 1rem; border-radius: var(--radius-md); }
.course-header .md p { margin: 0 0 0.25rem; }
.course-nav {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 0.35rem;
  font-size: var(--fs-sm);
  margin: 0 0 1rem;
}
.course-nav a {
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-weight: 500;
}
.schedule-section { padding: 1.25rem; }
.public-schedule { font-size: var(--fs-xs); }
.public-schedule .date {
  width: 8.5rem;
  white-space: nowrap;
  color: var(--ink-2);
  font-weight: 500;
}
.public-schedule .materials {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-left: 0.4rem;
  vertical-align: middle;
}

.schedule .date { white-space: nowrap; color: var(--ink-2); }
tr.assignment td {
  background: #fff8e6 !important;
  border-left: 3px solid #fbbc04;
  font-size: var(--fs-xs);
}
tr.assignment .due-line { color: var(--ink-2); }
.due-callout {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
}
.due-title {
  color: var(--ink);
  font-weight: 500;
}
tr.noclass td { color: var(--ink-3); }
tr.noclass a { color: var(--ink-3); }

.due { font-size: var(--fs-sm); color: #b06000; }
.materials a { margin: 0; font-weight: 500; }
.materials-list { margin: 0.2rem 0; padding-left: 1.2rem; font-size: 0.9em; }
.md img { max-width: 100%; border-radius: var(--radius-sm); }
.md p:last-child { margin-bottom: 0.4rem; }

/* ------- catalog (landing) ------- */

.catalog-masthead { text-align: center; padding: 3rem 0 2rem; animation: fadeUp 0.5s ease both; }
.masthead-kicker { margin: 0 0 0.5rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent); }
.masthead-title { font-family: var(--font-display); font-weight: 500; font-size: var(--fs-display); line-height: 1.05; color: var(--ink); margin: 0; }
.masthead-sub { margin: 0.8rem 0 0; font-size: var(--fs-base); font-weight: 400; color: var(--ink-2); }

.term-section { margin: 2.2rem 0; }
.term-label { display: flex; align-items: center; gap: 0.8rem; color: var(--ink-2); margin: 0 0 1rem; text-transform: uppercase; letter-spacing: 0.08em; }
.term-label .in-session {
  font-style: normal; font-weight: 500; letter-spacing: 0.01em; text-transform: none;
  color: #137333; background: #e6f4ea;
  border-radius: 999px; padding: 0.12rem 0.7rem; font-size: var(--fs-2xs);
}

.feature-card {
  display: grid; grid-template-columns: 1.45fr 1fr; gap: 1.2rem 2.4rem;
  padding: 1.6rem 1.8rem; margin: 0 0 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: inherit; animation: fadeUp 0.5s ease both;
  transition: box-shadow 0.18s ease, border-color 0.18s ease;
}
.feature-card:hover { box-shadow: var(--elev-1); border-color: #cfd1d4; }
.feature-main { display: flex; flex-direction: column; gap: 0.4rem; }
.card-code {
  font-size: var(--fs-2xs); font-weight: 500; letter-spacing: 0.05em;
  text-transform: uppercase; color: var(--card-accent, var(--accent));
}
.card-code::before {
  content: ""; display: inline-block; width: 8px; height: 8px;
  border-radius: 50%; background: var(--card-accent, var(--accent));
  margin-right: 0.5em; vertical-align: 1px;
}
.feature-title { font-family: var(--font-display); font-weight: 500; font-size: var(--fs-xl); line-height: 1.2; color: var(--ink); }
.feature-excerpt { margin: 0.15rem 0 0; font-size: var(--fs-sm); color: #3c4043; line-height: 1.55; }
.feature-meta { font-size: var(--fs-xs); color: var(--ink-2); margin-top: 0.3rem; }
.feature-cta { margin-top: 0.8rem; font-size: var(--fs-sm); font-weight: 500; color: var(--accent); }
.feature-cta .arrow { transition: transform 0.18s ease; display: inline-block; }
.feature-card:hover .feature-cta .arrow { transform: translateX(4px); }
.feature-side { display: flex; flex-direction: column; gap: 0.5rem; border-left: 1px solid #e8eaed; padding-left: 1.8rem; }
.side-label { color: var(--ink-3); margin-top: 0.4rem; text-transform: uppercase; letter-spacing: 0.06em; }
.semester-strip { display: flex; flex-wrap: wrap; gap: 3px; }
.semester-strip .tick { width: 9px; height: 16px; border-radius: 2px; display: inline-block; opacity: 0.9; transition: transform 0.12s ease; }
.feature-card:hover .semester-strip .tick { transform: scaleY(1.08); }
.upcoming { list-style: none; margin: 0; padding: 0; font-size: var(--fs-xs); color: #3c4043; }
.upcoming li { padding: 0.3rem 0; border-bottom: 1px solid #f1f3f4; line-height: 1.4; }
.upcoming li:last-child { border-bottom: 0; }
.upcoming .up-date { display: inline-block; min-width: 6.4em; margin-right: 0.4em; color: var(--ink-3); font-size: var(--fs-2xs); font-weight: 500; }

.archive-list { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md); overflow: hidden; }
.archive-row {
  display: flex; align-items: baseline; gap: 1.2rem;
  padding: 0.75rem 1.25rem; border-bottom: 1px solid #e8eaed; color: inherit;
  transition: background 0.15s ease;
}
.archive-row:last-child { border-bottom: 0; }
.archive-row:hover { background: #f8f9fa; }
.archive-row .card-code { min-width: 7em; }
.archive-title { font-family: var(--font-display); font-weight: 500; font-size: var(--fs-sm); color: var(--ink); }
.archive-row:hover .archive-title { color: var(--accent); }
.archive-meta { font-size: var(--fs-xs); color: var(--ink-2); }
.archive-term { margin-left: auto; font-size: var(--fs-2xs); font-weight: 500; color: var(--ink-2); white-space: nowrap; }
.archived-pill {
  display: inline-block; margin-left: 0.4em; padding: 0.05em 0.6em;
  background: #fff; border: 1px solid var(--border); border-radius: 999px;
  font-size: var(--fs-2xs); font-weight: 500; color: var(--ink-2);
}
.empty-state { text-align: center; padding: 3rem 0 4rem; color: var(--ink-2); }

@media (max-width: 720px) {
  .feature-card { grid-template-columns: 1fr; }
  .feature-side { border-left: 0; padding-left: 0; border-top: 1px solid #e8eaed; padding-top: 1rem; }
  .masthead-title { font-size: 2rem; }
}

/* ------- app pages ------- */

.login-card { max-width: 24rem; margin: 4.5rem auto; animation: fadeUp 0.5s ease both; }

.avatar { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; }
.avatar-fallback {
  width: 32px; height: 32px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; font-size: var(--fs-2xs); font-weight: 500; flex: 0 0 auto;
}

/* ------- forum ------- */

.forum-list {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.forum-row {
  display: grid;
  grid-template-columns: 7.5rem minmax(0, 1fr) 8rem;
  gap: 1rem;
  align-items: center;
  min-height: 4.25rem;
  padding: 0.85rem 1.1rem;
  color: inherit;
  border-bottom: 1px solid #e8eaed;
  transition: background 0.15s ease;
}
.forum-row:last-child { border-bottom: 0; }
.forum-row:hover { background: #f8f9fa; }
.forum-row.unread { box-shadow: inset 3px 0 0 var(--accent); }
.forum-row-placeholder:hover { background: var(--surface); }
.forum-state {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}
.forum-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-width: 0;
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--ink);
}
.forum-title-text {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.forum-row:hover .forum-title-text { color: var(--accent); }
.forum-meta {
  margin-top: 0.25rem;
  color: var(--ink-2);
  font-size: var(--fs-xs);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.forum-activity {
  color: var(--ink-2);
  font-size: var(--fs-xs);
  text-align: right;
  white-space: nowrap;
}
.forum-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 999px;
  color: var(--ink-2);
  background: #f1f3f4;
  font-size: var(--fs-2xs);
  font-weight: 700;
  line-height: 1;
}
.forum-icon-active {
  color: #1967d2;
  background: #e8f0fe;
}
.forum-article { margin-top: 0.75rem; }
.forum-article .md {
  overflow-wrap: anywhere;
  line-height: 1.6;
}
.forum-article pre,
.comment-body pre {
  padding: 0.85rem 1rem;
  border: 1px solid #e8eaed;
  border-radius: var(--radius-sm);
  background: #f8f9fa;
  overflow-x: auto;
}
.forum-thread-title {
  margin: 0.55rem 0 0.25rem;
  font-family: var(--font-display);
  font-size: 1.65rem;
  line-height: 1.25;
  font-weight: 500;
  color: var(--ink);
}
.forum-actionbar {
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid #e8eaed;
}
.comments-heading {
  margin: 1.5rem 0 0.65rem;
  font-size: var(--fs-base);
}
.comment-list {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.comment-item {
  padding: 0.9rem 1.1rem;
  border-bottom: 1px solid #e8eaed;
}
.comment-item:last-child { border-bottom: 0; }
.comment-item.nested {
  margin-left: 2rem;
  border-left: 2px solid #e8eaed;
  border-bottom: 1px solid #e8eaed;
}
.comment-item.endorsed {
  border-left: 3px solid #34a853;
  background: #f7fbf8;
}
.comment-body {
  margin-top: 0.35rem;
  color: #3c4043;
  font-size: var(--fs-sm);
  overflow-wrap: anywhere;
}
.comment-actions {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin-top: 0.45rem;
  font-size: var(--fs-xs);
}
.comment-actions .btn-link,
.comment-actions a {
  font-size: var(--fs-xs);
  font-weight: 500;
}
.reply-form {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: #f8f9fa;
  border: 1px solid #e8eaed;
  border-radius: var(--radius-md);
}
.reply-inline {
  display: flex;
  gap: 0.65rem;
  align-items: flex-start;
}
.reply-inline textarea { min-height: 4.25rem; }
.composer-panel { max-width: 52rem; }
.composer-body { min-height: 13rem; }
.similar-posts {
  margin-top: 0.65rem;
  background: #f8fafd;
  border: 1px solid #d2e3fc;
  border-radius: var(--radius-md);
  padding: 0.75rem 0.9rem;
}
.similar-posts-title {
  margin: 0 0 0.5rem;
  color: var(--ink-2);
  font-size: var(--fs-xs);
  font-weight: 500;
}
.similar-posts-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.similar-posts-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0;
  font-size: var(--fs-xs);
}

.page-footer {
  padding: 2rem 0; color: var(--ink-2); text-align: center;
  border-top: 1px solid var(--border);
  background: var(--surface);
  font-size: var(--fs-xs);
  flex: 0 0 auto;
}
.page-footer p { margin: 0; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .feature-card, .catalog-masthead, .login-card { animation: none; }
}

@media (max-width: 720px) {
  .app-body { display: block; }
  .course-sidebar {
    width: 100%;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    padding: 0.65rem 1rem;
  }
  .course-sidebar-head {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    padding: 0 0 0.5rem;
  }
  .course-sidebar-nav {
    display: flex;
    gap: 0.35rem;
    overflow-x: auto;
    padding-bottom: 0.15rem;
  }
  .sidebar-link {
    white-space: nowrap;
    min-height: 1.9rem;
    padding: 0.35rem 0.6rem;
  }
  .sidebar-section { display: none; }
  .page-shell { padding: 1rem 1rem 2.5rem; }
  .page-header { flex-direction: column; align-items: stretch; }
  .page-actions { justify-content: flex-start; }
  .toolbar .form-control,
  .toolbar .form-select,
  .toolbar-search { width: 100%; max-width: none; }
  .forum-row {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }
  .forum-activity { text-align: left; }
  .forum-title-text { white-space: normal; }
  .comment-item.nested { margin-left: 0.75rem; }
  .reply-inline { flex-direction: column; }
  .reply-inline .btn { align-self: flex-end; }
  .detail-grid { grid-template-columns: 1fr; }
  .meta-list div { grid-template-columns: 1fr; gap: 0.2rem; }
  .compact-edit-row,
  .compact-edit-row-4 { grid-template-columns: 1fr; }
  .directory-item { align-items: flex-start; flex-direction: column; }
  .inline-edit-row { grid-template-columns: 1fr; }
}