/* ============================================================
   MSDS 选课板 · 主题：XingHuiSama（毛玻璃 / indigo / 衬线）
   深色模式跟随系统偏好（prefers-color-scheme）
   ============================================================ */

:root {
  --font-serif: Georgia, "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
  --font-sans: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, Menlo, monospace;

  --bg: #f6f8fc;
  --bg-glow-1: rgba(99, 102, 241, 0.16);
  --bg-glow-2: rgba(168, 85, 247, 0.13);
  --bg-glow-3: rgba(56, 189, 248, 0.12);

  --card: rgba(255, 255, 255, 0.55);
  --card-strong: rgba(255, 255, 255, 0.78);
  --card-soft: rgba(255, 255, 255, 0.35);
  --border: rgba(255, 255, 255, 0.65);
  --border-strong: rgba(148, 163, 184, 0.45);
  --hairline: rgba(100, 116, 139, 0.14);

  --ink: #1e293b;
  --muted: #64748b;
  --faint: #94a3b8;

  --primary: #4f46e5;
  --primary-strong: #4338ca;
  --primary-soft: rgba(99, 102, 241, 0.12);
  --violet: #9333ea;
  --accent-gradient: linear-gradient(120deg, #6366f1, #8b5cf6 55%, #d946ef);

  --ok: #059669;
  --ok-soft: rgba(16, 185, 129, 0.14);
  --danger: #dc2626;
  --danger-soft: rgba(239, 68, 68, 0.13);
  --warning: #d97706;
  --warning-soft: rgba(245, 158, 11, 0.16);
  --info: #0284c7;
  --info-soft: rgba(14, 165, 233, 0.14);
  --research: #7c3aed;
  --research-soft: rgba(139, 92, 246, 0.14);

  --shadow-card: 0 18px 44px rgba(15, 23, 42, 0.1);
  --shadow-float: 0 14px 34px rgba(15, 23, 42, 0.16);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;

  --hour-height: 60px;
  font-family: var(--font-sans);
  color: var(--ink);
  font-synthesis: none;
}

.brand-details {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.header-programme-select {
  position: relative;
  display: inline-flex;
  width: max-content;
  max-width: 100%;
  align-items: center;
}

.header-programme-select::after {
  position: absolute;
  right: 3px;
  top: 50%;
  width: 7px;
  height: 7px;
  margin-top: -6px;
  border-right: 1.75px solid currentColor;
  border-bottom: 1.75px solid currentColor;
  color: var(--muted);
  content: "";
  pointer-events: none;
  transform: rotate(45deg);
}

.header-programme-select select {
  appearance: none;
  max-width: 230px;
  padding: 0 20px 0 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.15;
  cursor: pointer;
}

.header-programme-select select:focus-visible {
  border-radius: 4px;
  box-shadow: 0 0 0 2px var(--primary-soft);
}

.header-semester-select {
  position: relative;
  display: inline-flex;
  width: max-content;
  max-width: 100%;
  align-items: center;
}

.header-semester-select::after {
  position: absolute;
  right: 4px;
  top: 50%;
  width: 7px;
  height: 7px;
  margin-top: -5px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  color: var(--muted);
  content: "";
  pointer-events: none;
  transform: rotate(45deg);
}

.header-semester-select select {
  appearance: none;
  max-width: 210px;
  padding: 0 22px 0 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 11px;
  cursor: pointer;
}

.header-semester-select select:focus-visible {
  border-radius: 4px;
  box-shadow: 0 0 0 2px var(--primary-soft);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #020617;
    --bg-glow-1: rgba(99, 102, 241, 0.2);
    --bg-glow-2: rgba(147, 51, 234, 0.16);
    --bg-glow-3: rgba(14, 165, 233, 0.14);

    --card: rgba(30, 41, 59, 0.5);
    --card-strong: rgba(30, 41, 59, 0.72);
    --card-soft: rgba(30, 41, 59, 0.34);
    --border: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(148, 163, 184, 0.32);
    --hairline: rgba(148, 163, 184, 0.16);

    --ink: #f1f5f9;
    --muted: #94a3b8;
    --faint: #64748b;

    --primary: #818cf8;
    --primary-strong: #a5b4fc;
    --primary-soft: rgba(99, 102, 241, 0.2);

    --ok: #34d399;
    --ok-soft: rgba(52, 211, 153, 0.16);
    --danger: #f87171;
    --danger-soft: rgba(248, 113, 113, 0.16);
    --warning: #fbbf24;
    --warning-soft: rgba(251, 191, 36, 0.16);
    --info: #38bdf8;
    --info-soft: rgba(56, 189, 248, 0.16);
    --research: #a78bfa;
    --research-soft: rgba(167, 139, 250, 0.16);

    --shadow-card: 0 18px 44px rgba(2, 6, 23, 0.45);
    --shadow-float: 0 14px 34px rgba(2, 6, 23, 0.55);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background-color: var(--bg);
  background-attachment: fixed;
  transition: background-color 600ms ease, color 600ms ease;
}

button,
input,
select {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: inherit;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid var(--primary-soft);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------------- 顶栏（毛玻璃） ---------------- */

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
  padding: 10px clamp(20px, 4vw, 64px);
  border-bottom: 1px solid var(--border);
  background: var(--card);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  transition: background 600ms ease, border-color 600ms ease;
}

.site-header,
.site-header * {
  pointer-events: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.brand-home {
  display: grid;
  grid-template-columns: 40px auto;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 12px;
  background: var(--primary);
  color: white;
  font-size: 19px;
  font-weight: 900;
  font-family: var(--font-serif);
  box-shadow: 0 6px 18px rgba(99, 102, 241, 0.35);
}

.brand strong,
.brand small {
  display: block;
  letter-spacing: 0;
}

.brand strong {
  font-size: 15px;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 11px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav a {
  position: relative;
  padding: 9px 13px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: color 200ms ease, background 200ms ease;
}

.main-nav a:hover {
  color: var(--primary);
}

.main-nav a.active {
  color: var(--primary);
}

.main-nav a.active::after {
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--primary);
  content: "";
  transform: translateX(-50%);
  animation: nav-pulse 1.6s ease-in-out infinite;
}

.main-nav .support-link {
  display: inline-flex;
  min-height: 42px;
  padding: 10px 17px;
  align-items: center;
  gap: 7px;
  border: 1px solid #f0d8d2;
  background: linear-gradient(145deg, #fffdfc 0%, #fff0eb 100%);
  color: #c74631;
  font-size: 14px;
  font-weight: 850;
  box-shadow: 0 8px 20px rgba(199, 70, 49, 0.14);
  transition: background 200ms ease, border-color 200ms ease, transform 200ms ease;
}

.main-nav .support-link:hover {
  border-color: #e9bbae;
  background: #ffe9e1;
  color: #a93624;
  transform: translateY(-1px);
}

.support-star {
  font-size: 16px;
  line-height: 1;
}

.support-mobile-text {
  display: none;
}

@keyframes nav-pulse {
  0%, 100% { opacity: 0.35; transform: translateX(-50%) scale(0.85); }
  50% { opacity: 1; transform: translateX(-50%) scale(1); }
}

.main-nav .github-link {
  display: grid;
  width: 38px;
  height: 38px;
  margin-left: 4px;
  padding: 0;
  place-items: center;
  flex: 0 0 auto;
}

.github-link svg {
  display: block;
}

main {
  width: 100%;
}

/* ---------------- 页面引言 ---------------- */

.page-intro {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 28px;
  width: min(1520px, calc(100% - 40px));
  margin: 0 auto;
  padding: 46px 0 28px;
}

.page-intro h1 {
  max-width: 760px;
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: clamp(30px, 4vw, 52px);
  line-height: 1.08;
  letter-spacing: 0;
}

.page-intro h1.page-title {
  color: var(--ink);
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-intro p:not(.eyebrow) {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.planner-intro-copy {
  min-width: 0;
}

.planner-title-row {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 14px;
}

.planner-title-row .page-title {
  margin: 0;
}

.planner-intro-logo {
  display: block;
  width: 96px;
  height: 96px;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: #ffffff;
  object-fit: contain;
  box-shadow: 0 12px 28px rgba(40, 52, 78, 0.1);
  flex: 0 0 auto;
}

span.planner-intro-logo.brand-mark {
  display: inline-grid;
  place-items: center;
  flex: 0 0 96px;
  width: 96px;
  height: 96px;
  border-radius: 24px;
  color: #fff;
  font-size: 42px;
  font-weight: 800;
  background: linear-gradient(145deg, #6857ff, #3f35df);
  box-shadow: 0 16px 36px rgba(79, 70, 229, 0.22);
}

.eyebrow {
  margin: 0;
  color: var(--primary);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.intro-stats {
  display: flex;
  align-items: stretch;
  gap: 10px;
}

.planner-intro-side {
  display: grid;
  flex: 0 0 auto;
  gap: 10px;
}

.study-resource-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 11px;
  min-width: 254px;
  padding: 12px 15px;
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(239, 246, 255, 0.96), rgba(255, 255, 255, 0.96));
  color: var(--ink);
  text-decoration: none;
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.08);
  transition: transform 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
}

.study-resource-card:hover {
  transform: translateY(-2px);
  border-color: rgba(59, 130, 246, 0.46);
  box-shadow: 0 13px 30px rgba(37, 99, 235, 0.13);
}

.study-resource-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 12px;
  background: #2563eb;
  color: #fff;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.study-resource-card strong,
.study-resource-card small {
  display: block;
}

.study-resource-card strong {
  font-size: 13px;
  font-weight: 900;
}

.study-resource-card small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 10px;
}

.study-resource-card b {
  color: #2563eb;
  font-size: 20px;
}

.intro-stats div {
  min-width: 122px;
  padding: 15px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--card-strong);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.06);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.intro-stats div:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.1);
}

.intro-stats strong,
.intro-stats span {
  display: block;
}

.intro-stats strong {
  font-size: 21px;
  font-weight: 900;
  color: var(--primary);
  letter-spacing: -0.01em;
}

.intro-stats div:last-child strong {
  color: var(--violet);
}

.intro-stats span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.programme-requirement {
  display: flex;
  width: min(1180px, calc(100% - 40px));
  margin: -18px auto 28px;
  padding: 18px 22px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--card-strong);
  box-shadow: var(--shadow-card);
}

.requirement-kicker { color: var(--primary); font-size: 11px; font-weight: 850; letter-spacing: .08em; }
.programme-requirement h2 { margin: 3px 0 5px; font-size: 18px; }
.programme-requirement p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.65; }
.programme-requirement a { flex: 0 0 auto; color: var(--primary-strong); font-size: 12px; font-weight: 800; text-decoration: none; }
.programme-requirement a:hover { text-decoration: underline; }

.course-unit { margin-top: 4px; color: var(--muted); font-size: 10px; font-weight: 700; }

/* ---------------- 规划器外壳（毛玻璃卡片） ---------------- */

.planner-shell {
  display: grid;
  grid-template-columns: 350px minmax(760px, 1fr);
  width: min(1520px, calc(100% - 40px));
  min-height: 760px;
  margin: 0 auto 52px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px) saturate(1.25);
  -webkit-backdrop-filter: blur(16px) saturate(1.25);
}

.course-sidebar {
  display: flex;
  min-height: 0;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--hairline);
  background: var(--card-soft);
}

.sidebar-head {
  padding: 16px 16px 12px;
}

.segmented-control {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card-strong);
  box-shadow: inset 0 1px 3px rgba(15, 23, 42, 0.04);
}

.semester-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 10px;
  padding: 4px;
  border-radius: 14px;
  background: var(--surface-soft);
}

.sidebar-search {
  margin-bottom: 12px;
}

.semester-tab {
  min-height: 34px;
  border: 0;
  border-radius: 10px;
  color: var(--muted);
  background: transparent;
  font: inherit;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}

.semester-tab.active {
  color: var(--primary);
  background: var(--surface);
  box-shadow: 0 4px 14px rgba(46, 49, 86, 0.08);
}

.segment {
  min-height: 36px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  transition: background 200ms ease, color 200ms ease, box-shadow 200ms ease;
}

.segment.active {
  background: var(--primary-soft);
  color: var(--primary-strong);
  box-shadow: 0 1px 5px rgba(15, 23, 42, 0.08);
}

.sidebar-panel {
  min-height: 0;
  padding: 0 16px 16px;
}

.sidebar-panel:not([hidden]) {
  display: flex;
  flex: 1 1 0;
  flex-direction: column;
  overflow: hidden;
}

.search-box {
  display: block;
  position: relative;
}

.search-icon {
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 15px;
  width: 17px;
  height: 17px;
  color: var(--faint);
  pointer-events: none;
  transform: translateY(-50%);
  transition: color 200ms ease;
}

.search-box:focus-within .search-icon {
  color: var(--primary);
}

.search-box input {
  width: 100%;
  height: 44px;
  padding: 0 16px 0 40px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card-strong);
  color: var(--ink);
  font-size: 13px;
  box-shadow: 0 2px 10px rgba(15, 23, 42, 0.05);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 200ms ease, box-shadow 200ms ease;
}

.search-box input:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.search-box input::placeholder {
  color: var(--faint);
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 12px 0 14px;
}

.filter-pill {
  min-height: 30px;
  padding: 4px 13px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card-strong);
  color: var(--muted);
  cursor: pointer;
  font-size: 12px;
  font-weight: 650;
  transition: all 200ms ease;
}

.filter-pill:hover {
  color: var(--primary);
  border-color: var(--primary-soft);
}

.filter-pill.active {
  border-color: transparent;
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

@media (prefers-color-scheme: dark) {
  .filter-pill.active {
    background: var(--primary-strong);
    color: #0f172a;
  }
}

.day-filter {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  margin: -3px 0 14px;
}

.day-filter > span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.06em;
}

.day-filter-row {
  display: grid;
  grid-template-columns: 1.35fr repeat(6, 1fr);
  gap: 3px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card-strong);
}

.day-filter-pill {
  min-width: 0;
  min-height: 28px;
  padding: 3px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 10px;
  font-weight: 750;
  transition: all 200ms ease;
}

.day-filter-pill:hover {
  color: var(--primary);
}

.day-filter-pill.active {
  background: var(--primary-soft);
  color: var(--primary-strong);
  box-shadow: 0 1px 4px rgba(15, 23, 42, 0.08);
}

.smart-filter {
  margin: 0 0 14px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: color-mix(in srgb, var(--card-strong) 84%, transparent);
  overflow: hidden;
}

.smart-filter-head,
.smart-filter-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.smart-filter-head {
  min-height: 38px;
  padding: 8px 10px;
  color: var(--ink);
  cursor: pointer;
  font-size: 11px;
  font-weight: 800;
  list-style: none;
  user-select: none;
}

.smart-filter-head::-webkit-details-marker {
  display: none;
}

.smart-filter-head:hover {
  color: var(--primary);
  background: var(--primary-soft);
}

.smart-filter-head-meta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.smart-filter-chevron {
  width: 7px;
  height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform 180ms ease;
}

.smart-filter[open] .smart-filter-chevron {
  transform: rotate(225deg) translate(-1px, -1px);
}

#smart-filter-count {
  color: var(--primary);
  font-size: 10px;
  font-weight: 750;
}

.smart-filter-list {
  display: grid;
  gap: 5px;
  padding: 3px 10px 10px;
  border-top: 1px solid var(--hairline);
}

.smart-filter-item > span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
}

.tri-state {
  display: grid;
  grid-template-columns: repeat(3, 38px);
  gap: 2px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card-soft);
}

.smart-filter-option {
  min-height: 23px;
  padding: 2px 5px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--faint);
  cursor: pointer;
  font-size: 9px;
  font-weight: 750;
  transition: background 160ms ease, color 160ms ease, box-shadow 160ms ease;
}

.smart-filter-option:hover {
  color: var(--primary);
}

.smart-filter-option.active {
  background: var(--primary-soft);
  color: var(--primary-strong);
  box-shadow: 0 1px 4px rgba(15, 23, 42, 0.08);
}

.course-list,
.selected-list {
  height: 0;
  min-height: 0;
  flex: 1 1 0;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.course-list::-webkit-scrollbar,
.selected-list::-webkit-scrollbar {
  width: 8px;
}

.course-list::-webkit-scrollbar-thumb,
.selected-list::-webkit-scrollbar-thumb {
  border-radius: 8px;
  background: var(--border-strong);
}

/* ---------------- 课程列表行 ---------------- */

.course-row {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 32px;
  gap: 10px;
  margin-bottom: 8px;
  padding: 13px 12px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  transition: border-color 200ms ease, background 200ms ease, box-shadow 200ms ease;
}

.course-row:hover,
.course-row:focus-within {
  z-index: 15;
  border-color: var(--border);
  background: var(--card-strong);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.08);
}

.course-row-main {
  min-width: 0;
}

.course-code-line {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
}

.course-code {
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
}

.course-title-link {
  display: block;
  margin-top: 5px;
  overflow: hidden;
  color: var(--ink);
  font-size: 13px;
  font-weight: 650;
  line-height: 1.4;
  text-decoration: none;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.course-title-link:hover {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.course-meta {
  display: flex;
  gap: 8px;
  margin-top: 7px;
  color: var(--muted);
  font-size: 11px;
}

.course-schedule {
  display: -webkit-box;
  margin-top: 6px;
  overflow: hidden;
  color: var(--primary);
  font-size: 10px;
  line-height: 1.55;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.course-crn-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  margin-top: 6px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 700;
}

.course-crn-list b {
  color: var(--ink);
  font-weight: 900;
}

.course-preview {
  position: absolute;
  z-index: 20;
  top: calc(100% - 6px);
  right: 36px;
  left: 0;
  display: none;
  padding: 13px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card-strong);
  color: var(--ink);
  box-shadow: var(--shadow-float);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  max-height: min(360px, calc(100vh - 190px));
  overflow-y: auto;
  scrollbar-width: thin;
}

.course-row:hover .course-preview,
.course-row:focus-within .course-preview {
  display: block;
}

/* The last rows sit against the scroll viewport edge, so their preview opens upward. */
.course-row:nth-last-child(-n + 2) .course-preview {
  top: calc(100% - 6px);
  bottom: auto;
}

/* A short filtered list can make its first row also the last row; keep it below the filters. */
.course-row:first-child .course-preview {
  top: calc(100% - 6px);
  bottom: auto;
}

.course-preview p {
  margin: 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.65;
}

.course-preview-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 8px;
}

.course-preview-tags span {
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-strong);
  font-size: 9px;
  font-weight: 700;
}

.course-note-inline {
  display: -webkit-box;
  margin-top: 7px;
  overflow: hidden;
  color: var(--text);
  font-size: 10px;
  line-height: 1.5;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.course-note-inline strong,
.course-preview-note strong { margin-right: 6px; color: var(--primary-strong); }
.course-preview .course-preview-note { margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border); }
.course-row-actions { display: flex; gap: 7px; margin: 0 0 10px; }
.course-row-actions button,
.course-row-actions a {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--card-strong);
  color: var(--primary-strong);
  font: inherit;
  font-size: 10px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}
.course-row-actions button:hover,
.course-row-actions a:hover { border-color: var(--primary); background: var(--primary-soft); }

.quick-section-picker {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 7px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 700;
}

.quick-section-picker select {
  min-width: 0;
  height: 30px;
  padding: 0 24px 0 9px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card-strong);
  color: var(--ink);
  font-size: 10px;
}

.add-course,
.remove-course {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  align-self: center;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  background: var(--card-strong);
  color: var(--primary);
  cursor: pointer;
  font-size: 20px;
  line-height: 1;
  transition: all 200ms ease;
}

.add-course:hover {
  border-color: transparent;
  background: var(--primary);
  color: white;
  transform: scale(1.08);
  box-shadow: 0 5px 14px rgba(79, 70, 229, 0.35);
}

.add-course.is-added {
  border-color: var(--ok);
  background: var(--ok-soft);
  color: var(--ok);
  font-size: 15px;
}

.mini-badge,
.verdict-badge,
.status-badge,
.tag {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  border-radius: 999px;
  font-weight: 700;
}

.mini-badge {
  padding: 2px 8px;
  font-size: 9px;
}

.mini-badge.core,
.verdict-badge.core {
  background: var(--info-soft);
  color: var(--info);
}

.mini-badge.strong,
.mini-badge.good,
.verdict-badge.strong,
.verdict-badge.good {
  background: var(--ok-soft);
  color: var(--ok);
}

.mini-badge.research,
.verdict-badge.research {
  background: var(--research-soft);
  color: var(--research);
}

.mini-badge.caution,
.verdict-badge.caution {
  background: var(--warning-soft);
  color: var(--warning);
}

.mini-badge.unknown,
.verdict-badge.unknown {
  background: var(--card-soft);
  color: var(--muted);
}

.empty-list {
  padding: 42px 16px;
  color: var(--muted);
  text-align: center;
  font-size: 13px;
  line-height: 1.7;
}

/* ---------------- 已选课程 ---------------- */

.selected-course {
  padding: 14px 2px;
  margin-bottom: 4px;
}

.selected-course-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.selected-course-head a {
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
  text-decoration: none;
}

.selected-course-head a:hover {
  color: var(--primary);
}

.selected-course-head small {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 10px;
}

.remove-course {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 17px;
}

.remove-course:hover {
  background: var(--danger-soft);
  color: var(--danger);
  transform: none;
  box-shadow: none;
}

.section-selects {
  display: grid;
  gap: 8px;
  margin-top: 11px;
}

.section-selects label {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
}

.section-selects select {
  min-width: 0;
  height: 34px;
  padding: 0 28px 0 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card-strong);
  color: var(--ink);
  font-size: 11px;
}

/* ---------------- 课表面板 ---------------- */

.timetable-panel {
  min-width: 0;
  background: transparent;
}

.timetable-toolbar {
  display: flex;
  min-height: 82px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--hairline);
}

.timetable-toolbar h2 {
  margin: 4px 0 0;
  font-size: 18px;
  letter-spacing: 0;
}

.timetable-toolbar .selection-summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 3px 7px;
  font-size: 12px;
  line-height: 1.55;
}

.selection-summary-part {
  white-space: nowrap;
}

.selection-summary-part strong {
  font-size: 15px;
  color: var(--primary);
}

.selection-summary-plus {
  color: var(--muted);
  font-size: 11px;
}

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

.selected-chips {
  display: flex;
  min-height: 45px;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
  padding: 8px 20px;
  border-bottom: 1px solid var(--hairline);
  background: var(--card-soft);
}

.selected-chip {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card-strong);
}

.selected-chip a {
  padding: 5px 5px 5px 11px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
  text-decoration: none;
}

.selected-chip a:hover {
  color: var(--primary);
}

.selected-chip button {
  width: 26px;
  height: 26px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 15px;
}

.selected-chip button:hover {
  background: var(--danger-soft);
  color: var(--danger);
}

.selected-chips-empty {
  color: var(--muted);
  font-size: 10px;
}

.button {
  min-height: 36px;
  padding: 7px 15px;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 750;
  text-decoration: none;
  transition: all 200ms ease;
}

.button-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 5px 14px rgba(79, 70, 229, 0.3);
}

.button-primary:hover {
  background: var(--primary-strong);
  transform: translateY(-1px);
}

.button-quiet {
  border-color: var(--border-strong);
  background: var(--card-strong);
  color: var(--muted);
}

.button-quiet:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.button-document {
  border-color: color-mix(in srgb, var(--primary) 38%, transparent);
  background: var(--primary-soft);
  color: var(--primary-strong);
}

.button-document:hover {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--primary-soft) 78%, var(--card-strong));
  transform: translateY(-1px);
}

.conflict-status {
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 750;
}

.conflict-status.is-clear {
  background: var(--ok-soft);
  color: var(--ok);
}

.conflict-status.has-conflict {
  background: var(--danger-soft);
  color: var(--danger);
  animation: conflict-shake 260ms ease;
}

@keyframes conflict-shake {
  0%, 100% { transform: translateX(0); }
  30% { transform: translateX(-2px); }
  60% { transform: translateX(2px); }
}

.timetable-scroll {
  width: 100%;
  overflow-x: auto;
}

.timetable {
  position: relative;
  display: grid;
  grid-template-columns: 60px repeat(6, minmax(132px, 1fr));
  grid-template-rows: 52px calc(13 * var(--hour-height));
  min-width: 900px;
}

.timetable-corner,
.day-heading {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--hairline);
  background: var(--card-strong);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.timetable-corner {
  grid-column: 1;
  grid-row: 1;
  color: var(--faint);
  font-size: 9px;
  font-family: var(--font-mono);
}

.day-heading {
  border-left: 1px solid var(--hairline);
}

.day-heading[data-day="M"] { grid-column: 2; }
.day-heading[data-day="T"] { grid-column: 3; }
.day-heading[data-day="W"] { grid-column: 4; }
.day-heading[data-day="R"] { grid-column: 5; }
.day-heading[data-day="F"] { grid-column: 6; }
.day-heading[data-day="S"] { grid-column: 7; }

.day-heading strong {
  font-size: 12px;
  font-weight: 800;
}

.day-heading[data-day="S"] strong {
  color: var(--primary);
}

.day-heading span {
  margin-top: 2px;
  color: var(--faint);
  font-size: 9px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.time-axis {
  position: relative;
  grid-column: 1;
  grid-row: 2;
  border-right: 1px solid var(--hairline);
  background: var(--card-soft);
}

.time-label {
  position: absolute;
  right: 9px;
  color: var(--faint);
  font-size: 9px;
  font-family: var(--font-mono);
  transform: translateY(-6px);
}

.day-columns {
  display: grid;
  grid-column: 2 / 8;
  grid-row: 2;
  grid-template-columns: repeat(6, minmax(132px, 1fr));
}

.day-column {
  position: relative;
  height: calc(13 * var(--hour-height));
  border-right: 1px solid var(--hairline);
  background-image: linear-gradient(to bottom, transparent calc(100% - 1px), var(--hairline) 1px);
  background-size: 100% var(--hour-height);
}

.day-column::after {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(to bottom, transparent calc(100% - 1px), rgba(148, 163, 184, 0.12) 1px);
  background-size: 100% calc(var(--hour-height) / 2);
  content: "";
}

.course-event {
  position: absolute;
  z-index: 2;
  min-height: 34px;
  overflow: visible;
  padding: 7px 8px 5px;
  border: 1px solid rgba(79, 70, 229, 0.16);
  border-left: 4px solid var(--event-accent, var(--primary));
  border-radius: 10px;
  background: var(--event-bg, var(--primary-soft));
  color: var(--event-ink, var(--primary-strong));
  cursor: pointer;
  text-align: left;
  box-shadow: 0 3px 10px rgba(15, 23, 42, 0.09);
  transition: box-shadow 200ms ease, transform 200ms ease, filter 200ms ease;
}

.course-event:hover {
  z-index: 5;
  filter: saturate(1.15) brightness(1.02);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.18);
  transform: translateY(-1px);
}

.course-event.is-conflict {
  border-color: var(--danger);
  box-shadow: inset 0 0 0 1px var(--danger), 0 4px 14px rgba(220, 38, 38, 0.2);
}

.event-label {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.event-label strong,
.event-label span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.event-label strong {
  font-size: 11px;
  line-height: 1.25;
}

.event-label span {
  margin-top: 3px;
  font-size: 9px;
  line-height: 1.25;
  opacity: 0.85;
}

.event-overlay {
  position: absolute;
  z-index: 30;
  top: calc(100% - 1px);
  left: -4px;
  display: none;
  width: max-content;
  min-width: 210px;
  max-width: 280px;
  padding: 13px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-strong);
  color: var(--ink);
  text-align: left;
  white-space: normal;
  box-shadow: var(--shadow-float);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  pointer-events: auto;
}

.course-event:hover .event-overlay,
.course-event:focus-within .event-overlay {
  display: block;
}

.course-event.tooltip-up .event-overlay {
  top: auto;
  bottom: calc(100% - 1px);
}

.course-event.tooltip-left .event-overlay {
  right: -4px;
  left: auto;
}

.event-overlay-content,
.event-overlay-content strong,
.event-overlay-content > span {
  display: block;
  overflow: visible;
  text-overflow: clip;
  white-space: normal;
}

.event-overlay-content strong {
  font-size: 12px;
  line-height: 1.4;
}

.event-overlay-content > span:not(.event-tooltip-tags) {
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.4;
}

.event-tooltip-tags {
  display: flex !important;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 8px;
}

.event-tooltip-tag {
  display: inline-flex !important;
  margin-top: 0 !important;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-strong) !important;
  font-size: 9px !important;
  line-height: 1.2 !important;
}

.event-overlay-actions {
  display: flex;
  gap: 6px;
  margin-top: 10px;
}

.event-overlay-actions a,
.event-overlay-actions button {
  min-height: 27px;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card-strong);
  cursor: pointer;
  font-size: 10px;
  font-weight: 750;
  text-decoration: none;
  transition: all 180ms ease;
}

.event-overlay-actions a {
  color: var(--primary-strong);
}

.event-overlay-actions a:hover {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.event-overlay-actions button {
  color: var(--danger);
}

.event-overlay-actions button:hover {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.event-overlay-actions .note-action { color: var(--primary-strong); }
.event-overlay-actions .note-action:hover { border-color: var(--primary); background: var(--primary-soft); }
.event-local-note { margin-top: 8px !important; padding-top: 8px; border-top: 1px solid var(--border); line-height: 1.45; }
.event-local-note b { display: block; margin-bottom: 3px; color: var(--text); }
.event-note-block {
  display: block !important;
  position: absolute;
  right: 7px;
  bottom: 6px;
  left: 8px;
  padding-top: 4px;
  border-top: 1px solid rgba(255, 255, 255, .45);
  overflow: hidden;
  color: var(--event-ink);
  font-size: 10px;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.note-dialog { width: min(460px, calc(100% - 32px)); padding: 0; border: 0; border-radius: 18px; background: var(--card-strong); color: var(--text); box-shadow: 0 24px 70px rgba(30, 36, 70, .28); }
.note-dialog::backdrop { background: rgba(28, 33, 52, .38); backdrop-filter: blur(3px); }
.note-dialog form { padding: 22px; }
.note-dialog-head { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 18px; }
.note-dialog-head span, .note-dialog label { display: block; color: var(--muted); font-size: 12px; }
.note-dialog-head strong { display: block; margin-top: 3px; font-size: 20px; }
.note-dialog-head button { border: 0; background: transparent; color: var(--text); font-size: 24px; cursor: pointer; }
.note-dialog textarea { width: 100%; margin-top: 8px; padding: 12px; resize: vertical; border: 1px solid var(--border); border-radius: 12px; background: var(--card); color: var(--text); font: inherit; line-height: 1.55; }
.note-display-options { display: grid; gap: 8px; margin: 14px 0 0; padding: 12px; border: 1px solid var(--border); border-radius: 12px; }
.note-display-options legend { padding: 0 4px; color: var(--muted); font-size: 12px; }
.note-display-options label { display: flex; align-items: center; gap: 8px; color: var(--text); font-size: 13px; cursor: pointer; }
.note-display-options input { accent-color: var(--primary); }
.note-dialog-actions { display: flex; justify-content: space-between; gap: 12px; margin-top: 16px; }

.empty-timetable {
  position: absolute;
  z-index: 4;
  top: 210px;
  left: calc(50% + 30px);
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--muted);
  transform: translateX(-50%);
}

.empty-timetable[hidden] {
  display: none;
}

.empty-timetable strong {
  color: var(--ink);
  font-size: 13px;
}

.empty-timetable p {
  margin: 5px 0 0;
  font-size: 11px;
}

.empty-plus {
  display: grid;
  width: 42px;
  height: 42px;
  margin-bottom: 12px;
  place-items: center;
  border: 1px dashed var(--border-strong);
  border-radius: 50%;
  color: var(--primary);
  font-size: 24px;
}

.data-note {
  margin: 0;
  padding: 12px 20px;
  border-top: 1px solid var(--hairline);
  color: var(--muted);
  font-size: 10px;
  line-height: 1.6;
}

/* ---------------- 课程详情页 ---------------- */

.course-detail {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: 34px 0 72px;
}

.back-link {
  display: inline-block;
  margin-bottom: 22px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
  transition: color 200ms ease, transform 200ms ease;
}

.back-link:hover {
  color: var(--primary);
  transform: translateX(-2px);
}

.detail-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: end;
  padding: 28px 30px 30px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.detail-code-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.detail-code {
  font-family: var(--font-mono);
  color: var(--primary);
  font-size: 14px;
  font-weight: 800;
}

.detail-hero h1 {
  max-width: 800px;
  margin: 9px 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(30px, 5vw, 52px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.detail-hero p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.detail-actions {
  display: flex;
  gap: 8px;
}

.detail-layout {
  padding-top: 36px;
}

.detail-section {
  margin-bottom: 40px;
}

.detail-section h2 {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.review-lead {
  padding: 20px 22px;
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--card-strong);
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-left-color: var(--primary);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.06);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.review-lead.caution {
  border-left-color: var(--warning);
  background: var(--warning-soft);
}

.review-lead.research {
  border-left-color: var(--research);
  background: var(--research-soft);
}

.review-lead.unknown {
  border-left-color: var(--border-strong);
}

.review-lead strong {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 800;
}

.review-lead p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.8;
}

.detail-tags {
  margin-top: 14px;
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--card-strong);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.fact {
  min-height: 86px;
  padding: 15px;
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.fact:nth-child(2n) {
  border-right: 0;
}

.fact:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.fact span,
.fact strong {
  display: block;
}

.fact span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.fact strong {
  margin-top: 7px;
  font-size: 12px;
  line-height: 1.55;
}

.section-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--card-strong);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.section-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 11px;
}

.section-table th,
.section-table td {
  padding: 12px 13px;
  border-bottom: 1px solid var(--hairline);
  text-align: left;
  vertical-align: top;
}

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

.section-table th {
  background: var(--card-soft);
  color: var(--muted);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-table td strong,
.section-table td span {
  display: block;
}

.section-table td span {
  margin-top: 3px;
  color: var(--muted);
}

.source-list {
  display: grid;
  gap: 14px;
  margin-top: 14px;
}

.source-section-intro {
  max-width: 760px;
  margin: -6px 0 16px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.7;
}

.source-review {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--card-strong);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.source-review-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--hairline);
}

.source-review-header strong,
.source-review-header span {
  display: block;
}

.source-review-header strong {
  font-size: 13px;
  line-height: 1.45;
}

.source-review-header span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
}

.source-review-link {
  flex: 0 0 auto;
  color: var(--primary);
  font-size: 11px;
  font-weight: 750;
  text-decoration: none;
}

.source-review-link:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.source-review > p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.85;
  white-space: pre-line;
}

.source-notice,
.source-empty {
  margin-top: 14px;
}

.section-heading-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }
.section-heading-row h2 { margin-bottom: 5px; }
.community-review-status { display: block; color: var(--muted); font-size: 11px; }
.community-review-status.is-shared { color: var(--success); }
.community-review-status.is-local { color: var(--muted); }
.community-review-status.is-error { color: var(--danger); }
.community-review-list { display: grid; gap: 12px; margin-top: 16px; }
.community-empty { padding: 18px; border: 1px dashed var(--border-strong); border-radius: var(--radius-md); color: var(--muted); font-size: 13px; line-height: 1.6; }
.community-review { padding: 16px 18px; border: 1px solid var(--border); border-radius: var(--radius-md); background: var(--card); }
.community-review-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.community-review-head strong { color: var(--text); font-size: 13px; }
.community-review-head span { color: var(--muted); font-size: 11px; }
.community-review p { margin: 10px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; white-space: pre-line; }
.community-review-source { display: inline-block; margin-top: 10px; color: var(--primary); font-size: 11px; text-decoration: none; }
.community-review-source:hover { text-decoration: underline; text-underline-offset: 3px; }
.review-dialog { width: min(520px, calc(100% - 32px)); padding: 0; border: 0; border-radius: 18px; background: var(--card-strong); color: var(--text); box-shadow: 0 24px 70px rgba(30, 36, 70, .28); }
.review-dialog::backdrop { background: rgba(28, 33, 52, .38); backdrop-filter: blur(3px); }
.review-dialog form { display: grid; gap: 14px; padding: 22px; }
.review-dialog-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }
.review-dialog-head span { display: block; color: var(--muted); font-size: 12px; }
.review-dialog-head strong { display: block; margin-top: 3px; font-size: 20px; }
.review-dialog-head > button { border: 0; background: transparent; color: var(--text); font-size: 24px; cursor: pointer; }
.review-dialog label { display: grid; gap: 7px; color: var(--muted); font-size: 12px; }
.review-dialog input,
.review-dialog select,
.review-dialog textarea { width: 100%; padding: 11px 12px; border: 1px solid var(--border); border-radius: 11px; background: var(--card); color: var(--text); font: inherit; line-height: 1.5; }
.review-dialog textarea { resize: vertical; }
.review-dialog input:focus,
.review-dialog select:focus,
.review-dialog textarea:focus { outline: 2px solid var(--primary-soft); border-color: var(--primary); }
.auth-mode { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 4px; border-radius: 10px; background: var(--primary-soft); }
.auth-mode button { padding: 8px; border: 0; border-radius: 8px; background: transparent; color: var(--muted); font: inherit; cursor: pointer; }
.auth-mode button.active { background: var(--card-strong); color: var(--primary-strong); box-shadow: 0 2px 8px rgba(36, 43, 85, .08); }
.form-hint, .form-error { margin: 0; font-size: 11px; line-height: 1.55; }
.form-hint { color: var(--muted); }
.form-error { min-height: 17px; color: var(--danger); }
.form-submit { width: 100%; justify-content: center; }
.review-dialog-actions { display: flex; justify-content: flex-end; gap: 10px; }

.notice {
  padding: 15px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--card-soft);
  color: var(--muted);
  font-size: 11px;
  line-height: 1.7;
}

.notice strong {
  color: var(--ink);
}

.loading-state,
.error-state {
  padding: 100px 20px;
  color: var(--muted);
  text-align: center;
}

.loading-state::before {
  display: block;
  width: 34px;
  height: 34px;
  margin: 0 auto 18px;
  border: 3px solid var(--primary-soft);
  border-top-color: var(--primary);
  border-radius: 50%;
  content: "";
  animation: spin 900ms linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.text-link {
  color: var(--primary);
  font-size: 11px;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
}

.text-link:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  padding: 4px 9px;
  background: var(--card-soft);
  color: var(--muted);
  font-size: 9px;
}

/* ---------------- Toast ---------------- */

.toast {
  position: fixed;
  z-index: 100;
  right: 22px;
  bottom: 22px;
  max-width: min(360px, calc(100vw - 44px));
  padding: 12px 16px;
  border-radius: 999px;
  background: #1e293b;
  color: white;
  font-size: 12px;
  font-weight: 650;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.3);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 200ms ease, transform 200ms ease;
}

@media (prefers-color-scheme: dark) {
  .toast {
    background: #e2e8f0;
    color: #0f172a;
  }
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ---------------- 详细课程介绍 ---------------- */

.syllabus-detail {
  width: min(1480px, calc(100% - 40px));
  margin: 0 auto;
  padding: 34px 0 76px;
}

.syllabus-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: end;
  margin-top: 18px;
  padding: 28px 30px 30px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
}

.syllabus-hero h1 {
  max-width: 900px;
  margin: 9px 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(29px, 4vw, 48px);
  line-height: 1.1;
  color: var(--ink);
}

.syllabus-hero p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.document-badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--info-soft);
  color: var(--info);
  font-size: 11px;
  font-weight: 800;
}

.syllabus-actions,
.syllabus-jump-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.syllabus-jump-links {
  margin: 18px 0;
}

.syllabus-jump-links a {
  padding: 8px 13px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--card-strong);
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
  text-decoration: none;
}

.syllabus-jump-links a:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.document-panel {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(14px) saturate(1.15);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  scroll-margin-top: 88px;
}

.document-panel-heading {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: end;
  margin-bottom: 14px;
}

.document-panel-heading span {
  display: block;
  margin-bottom: 4px;
  color: var(--primary);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.document-panel-heading h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 23px;
  color: var(--ink);
}

.document-panel-heading > a {
  color: var(--primary);
  font-size: 12px;
  font-weight: 750;
  text-decoration: none;
}

.document-panel-heading > a:hover {
  text-decoration: underline;
}

.pdf-fallback {
  margin: 12px 2px 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.6;
}

.translation-notice {
  margin-bottom: 14px;
  padding: 12px 14px;
  border: 1px solid color-mix(in srgb, var(--info) 28%, transparent);
  border-radius: var(--radius-sm);
  background: var(--info-soft);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.translation-notice strong {
  color: var(--info);
}

.bilingual-reader {
  scroll-margin-top: 88px;
}

.bilingual-reader:focus-visible {
  outline: 3px solid var(--primary-soft);
  outline-offset: 4px;
}

.bilingual-reader-heading {
  align-items: end;
}

.bilingual-reader-heading > p {
  max-width: 430px;
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.6;
  text-align: right;
}

.bilingual-pager {
  display: grid;
  grid-template-columns: minmax(110px, 1fr) auto minmax(110px, 1fr);
  gap: 12px;
  align-items: center;
  margin: 0 0 14px;
}

.bilingual-pager-bottom {
  margin: 14px 0 0;
}

.bilingual-page-button {
  min-height: 42px;
  padding: 9px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--card-strong);
  color: var(--primary-strong);
  font: inherit;
  font-size: 12px;
  font-weight: 780;
  cursor: pointer;
}

.bilingual-page-button:hover:not(:disabled) {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.bilingual-page-button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.bilingual-page-counter {
  padding: 6px 11px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-strong);
  font-size: 11px;
  white-space: nowrap;
  text-align: center;
}

.bilingual-page-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
  gap: 16px;
  align-items: start;
}

.bilingual-page-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--card-strong);
  box-shadow: 0 5px 18px rgba(15, 23, 42, 0.08);
}

.bilingual-card-heading {
  display: flex;
  min-height: 62px;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--hairline);
  background: var(--bg);
}

.bilingual-card-heading span {
  display: block;
  margin-bottom: 3px;
  color: var(--primary);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.bilingual-card-heading h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 19px;
}

.bilingual-card-heading > strong {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 11px;
}

.translation-card-heading {
  background: var(--primary-soft);
}

.original-image-stage {
  position: relative;
  display: grid;
  min-height: 420px;
  place-items: center;
  overflow: hidden;
  background: #e2e8f0;
}

#original-page-link {
  display: block;
  width: 100%;
  text-decoration: none;
}

.original-page-image {
  display: block;
  width: 100%;
  height: auto;
  background: white;
}

.original-image-message {
  padding: 42px 24px;
  color: #475569;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.65;
  text-align: center;
}

.original-image-message.is-error {
  color: var(--danger);
}

.bilingual-translation-text {
  min-height: 420px;
  padding: 22px;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.82;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.bilingual-reader .translation-notice {
  margin: 14px 0 0;
}

/* ---------------- 响应式 ---------------- */

@media (max-width: 1120px) {
  .planner-shell {
    grid-template-columns: 310px minmax(720px, 1fr);
    overflow-x: auto;
  }

}

@media (max-width: 900px) {
  .bilingual-page-grid {
    grid-template-columns: 1fr;
  }

  .bilingual-reader-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .bilingual-reader-heading > p {
    max-width: none;
    text-align: left;
  }
}

@media (max-width: 780px) {
  .programme-requirement {
    width: calc(100% - 32px);
    margin: -8px auto 20px;
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .site-header {
    min-height: 62px;
    padding: 8px 16px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand small {
    display: none;
  }

  .main-nav a {
    padding: 8px 10px;
    font-size: 12px;
  }

  .main-nav .github-link {
    width: 34px;
    height: 34px;
    margin-left: 0;
  }

  .main-nav .support-link {
    min-height: 36px;
    padding: 8px 10px;
    gap: 5px;
    font-size: 12px;
  }

  .support-desktop-text {
    display: none;
  }

  .support-mobile-text {
    display: inline;
  }

  .page-intro {
    width: calc(100% - 32px);
    padding: 30px 0 22px;
  }

  .planner-intro {
    display: block;
  }

  .planner-intro-side {
    margin-top: 22px;
  }

  .study-resource-card {
    width: 100%;
    min-width: 0;
  }

  .planner-title-row {
    gap: 14px;
  }

  .planner-intro-logo {
    width: 80px;
    height: 80px;
    border-radius: 18px;
  }

  .intro-stats {
    margin-top: 0;
  }

  .intro-stats div {
    min-width: 0;
    flex: 1;
    padding: 12px 14px;
  }

  .intro-stats strong {
    font-size: 16px;
  }

  .planner-shell {
    display: block;
    width: calc(100% - 24px);
    overflow: visible;
  }

  .course-sidebar {
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--hairline);
  }

  .sidebar-panel:not([hidden]) {
    flex: none;
    overflow: visible;
  }

  .course-list,
  .selected-list {
    height: auto;
    min-height: 380px;
    max-height: 380px;
    flex: none;
  }

  .timetable-toolbar {
    align-items: flex-start;
    padding: 14px;
  }

  .toolbar-actions {
    align-items: flex-end;
    flex-direction: column;
  }

  .course-detail {
    width: calc(100% - 32px);
    padding-top: 22px;
  }

  .syllabus-detail {
    width: calc(100% - 32px);
    padding-top: 22px;
  }

  .detail-hero {
    grid-template-columns: 1fr;
    align-items: start;
    padding: 22px;
  }

  .detail-actions {
    flex-wrap: wrap;
  }

  .syllabus-hero {
    grid-template-columns: 1fr;
    align-items: start;
    padding: 22px;
  }

  .bilingual-pager {
    grid-template-columns: minmax(92px, 1fr) auto minmax(92px, 1fr);
    gap: 8px;
  }

  .bilingual-page-button {
    padding: 9px 10px;
  }

  .source-review-header {
    align-items: stretch;
    flex-direction: column;
    gap: 9px;
  }

  .source-review-link {
    align-self: flex-start;
  }
}

@media (max-width: 480px) {
  .brand strong {
    font-size: 13px;
  }

  .page-intro h1 {
    font-size: 32px;
  }

  .planner-title-row {
    gap: 12px;
  }

  .planner-intro-logo {
    width: 68px;
    height: 68px;
    border-radius: 16px;
  }

  .intro-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

  .intro-stats div {
    padding: 12px 10px;
  }

  .intro-stats span {
    font-size: 9px;
  }

  .conflict-status {
    max-width: 104px;
    text-align: center;
  }

  .fact-grid {
    grid-template-columns: 1fr;
  }

  .fact,
  .fact:nth-child(2n),
  .fact:nth-last-child(-n + 2) {
    border-right: 0;
    border-bottom: 1px solid var(--hairline);
  }

  .fact:last-child {
    border-bottom: 0;
  }

  .document-panel {
    padding: 14px;
    border-radius: var(--radius-md);
  }

  .document-panel-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .bilingual-pager {
    grid-template-columns: minmax(78px, 1fr) auto minmax(78px, 1fr);
    gap: 6px;
  }

  .bilingual-page-button {
    padding: 8px 6px;
    font-size: 11px;
  }

  .bilingual-page-counter {
    padding: 5px 8px;
    font-size: 10px;
  }

  .bilingual-card-heading {
    min-height: 56px;
    padding: 9px 11px;
  }

  .original-image-stage,
  .bilingual-translation-text {
    min-height: 300px;
  }

  .bilingual-translation-text {
    padding: 16px;
    font-size: 13px;
  }

}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}