/* Hugging Face–inspired offline teaching UI (Traditional Chinese HK) */
:root {
  --hf-yellow: #FFD21E;
  --hf-yellow-hover: #f5c400;
  --hf-yellow-soft: #fff6c2;
  --bg: #ffffff;
  --bg-soft: #f9fafb;
  --bg-card: #ffffff;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --text: #0b0f19;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --link: #3b82f6;
  --link-hover: #1d4ed8;
  --chip-bg: #f3f4f6;
  --nav-h: 64px;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 1px 3px rgba(0,0,0,.06);
  --shadow-hover: 0 4px 14px rgba(0,0,0,.08);
  --radius: 12px;
  --radius-sm: 8px;
  --font: "Inter", "Noto Sans TC", "PingFang HK", "Microsoft JhengHei", "Helvetica Neue", Arial, sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", "Menlo", "Consolas", monospace;
  --success: #10b981;
  --info: #3b82f6;
  --warn: #f59e0b;
}

[data-theme="dark"] {
  --bg: #0b0f19;
  --bg-soft: #111827;
  --bg-card: #111827;
  --border: #1f2937;
  --border-strong: #374151;
  --text: #f3f4f6;
  --text-secondary: #d1d5db;
  --text-muted: #9ca3af;
  --link: #60a5fa;
  --link-hover: #93c5fd;
  --chip-bg: #1f2937;
  --shadow: 0 1px 2px rgba(0,0,0,.3);
  --shadow-hover: 0 8px 24px rgba(0,0,0,.35);
  --hf-yellow-soft: #3a3108;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; }

.container {
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto;
}

/* Top nav — HF-like */
.topnav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
}
.topnav-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: min(1200px, calc(100% - 2rem));
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; color: var(--text); }
.brand-mark {
  width: 28px; height: 28px;
  border-radius: 8px;
  background: var(--hf-yellow);
  display: grid; place-items: center;
  font-size: 14px;
  color: #111;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.08);
}
.brand-sub {
  font-weight: 500;
  color: var(--text-muted);
  font-size: .78rem;
  margin-left: .25rem;
}
.nav-links {
  display: flex;
  gap: .25rem;
  margin-left: .5rem;
  flex-wrap: wrap;
}
.nav-links a {
  color: var(--text-secondary);
  padding: .4rem .7rem;
  border-radius: 999px;
  font-size: .92rem;
  text-decoration: none;
}
.nav-links a:hover, .nav-links a.active {
  background: var(--chip-bg);
  color: var(--text);
  text-decoration: none;
}
.nav-spacer { flex: 1; }
.nav-actions { display: flex; align-items: center; gap: .5rem; }
.icon-btn {
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  border-radius: 999px;
  width: 36px; height: 36px;
  display: grid; place-items: center;
  cursor: pointer;
}
.icon-btn:hover { border-color: var(--border-strong); color: var(--text); }

.offline-badge {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  background: var(--hf-yellow);
  color: #111;
  font-size: .75rem;
  font-weight: 700;
  padding: .25rem .6rem;
  border-radius: 999px;
  letter-spacing: .02em;
}

/* Hero */
.hero {
  padding: 2.2rem 0 1.4rem;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(1200px 240px at 10% -40%, color-mix(in srgb, var(--hf-yellow) 35%, transparent), transparent),
    var(--bg);
}
.hero h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  line-height: 1.25;
  margin: 0 0 .6rem;
}
.hero p {
  margin: 0;
  color: var(--text-secondary);
  max-width: 52rem;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1rem;
}

/* Search + filters */
.toolbar {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 1.25rem 0;
}
.search-wrap {
  position: relative;
}
.search-wrap input {
  width: 100%;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  border-radius: 999px;
  padding: .85rem 1rem .85rem 2.6rem;
  font-size: 1rem;
  outline: none;
  box-shadow: var(--shadow);
}
.search-wrap input:focus {
  border-color: var(--hf-yellow);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--hf-yellow) 45%, transparent);
}
.search-wrap .search-icon {
  position: absolute;
  left: 1rem; top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: center;
}
.filter-label {
  font-size: .85rem;
  color: var(--text-muted);
  margin-right: .15rem;
}
.chip {
  border: 1px solid var(--border);
  background: var(--chip-bg);
  color: var(--text-secondary);
  border-radius: 999px;
  padding: .35rem .75rem;
  font-size: .85rem;
  cursor: pointer;
  user-select: none;
}
.chip:hover { border-color: var(--border-strong); color: var(--text); }
.chip.active {
  background: var(--hf-yellow);
  border-color: var(--hf-yellow);
  color: #111;
  font-weight: 600;
}
.results-count {
  color: var(--text-muted);
  font-size: .9rem;
  padding-bottom: .75rem;
}

/* Model cards grid */
.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  padding-bottom: 3rem;
}
.model-card {
  display: flex;
  flex-direction: column;
  gap: .55rem;
  border: 1px solid var(--border);
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 1rem 1.05rem;
  box-shadow: var(--shadow);
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
  color: inherit;
  text-decoration: none;
  min-height: 190px;
}
.model-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  border-color: color-mix(in srgb, var(--hf-yellow) 55%, var(--border));
  text-decoration: none;
  color: inherit;
}
.model-card .org {
  color: var(--text-muted);
  font-size: .82rem;
}
.model-card .name {
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.35;
  word-break: break-word;
}
.model-card .summary {
  color: var(--text-secondary);
  font-size: .88rem;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
}
.tag {
  font-size: .72rem;
  padding: .15rem .45rem;
  border-radius: 6px;
  background: var(--chip-bg);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.tag.task {
  background: var(--hf-yellow-soft);
  border-color: color-mix(in srgb, var(--hf-yellow) 50%, var(--border));
  color: var(--text);
  font-weight: 600;
}
.card-meta {
  display: flex;
  justify-content: space-between;
  gap: .5rem;
  font-size: .78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: .55rem;
  margin-top: .15rem;
}

/* Model detail */
.detail-header {
  padding: 1.75rem 0 1rem;
  border-bottom: 1px solid var(--border);
}
.breadcrumb {
  font-size: .85rem;
  color: var(--text-muted);
  margin-bottom: .75rem;
}
.detail-title {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 1rem;
  justify-content: space-between;
}
.detail-title h1 {
  margin: 0;
  font-size: clamp(1.35rem, 2.5vw, 1.9rem);
  word-break: break-word;
}
.detail-org { color: var(--text-muted); margin: .25rem 0 .6rem; }
.pill-row { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .5rem; }
.pill {
  display: inline-flex; align-items: center; gap: .3rem;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  border-radius: 999px;
  padding: .25rem .65rem;
  font-size: .8rem;
  color: var(--text-secondary);
}
.pill.accent {
  background: var(--hf-yellow);
  border-color: var(--hf-yellow);
  color: #111;
  font-weight: 700;
}

.tabs {
  display: flex;
  gap: .25rem;
  overflow-x: auto;
  border-bottom: 1px solid var(--border);
  margin-top: 1rem;
}
.tab-btn {
  border: none;
  background: transparent;
  color: var(--text-muted);
  padding: .85rem 1rem;
  cursor: pointer;
  font-size: .95rem;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--text);
  border-bottom-color: var(--hf-yellow);
  font-weight: 700;
}
.tab-panel { display: none; padding: 1.4rem 0 3rem; }
.tab-panel.active { display: block; }

.prose h2 { margin: 1.4rem 0 .6rem; font-size: 1.25rem; }
.prose h3 { margin: 1.1rem 0 .45rem; font-size: 1.05rem; }
.prose p { color: var(--text-secondary); }
.prose ul { color: var(--text-secondary); padding-left: 1.2rem; }
.prose li { margin: .35rem 0; }

.teach-step {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  background: var(--bg-soft);
  margin: .75rem 0;
  position: relative;
}
.teach-step .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.6rem;
  height: 1.6rem;
  border-radius: 999px;
  background: var(--hf-yellow);
  color: #111;
  font-weight: 800;
  font-size: .85rem;
  margin-right: .45rem;
}
.diagram {
  background: #0b0f19;
  color: #e5e7eb;
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: .82rem;
  line-height: 1.45;
  white-space: pre;
  border: 1px solid #1f2937;
}
[data-theme="dark"] .diagram {
  background: #030712;
}

.config-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
  margin: 1rem 0 1.5rem;
}
.config-table th, .config-table td {
  border: 1px solid var(--border);
  padding: .7rem .75rem;
  text-align: left;
  vertical-align: top;
}
.config-table th {
  background: var(--bg-soft);
  font-size: .8rem;
  text-transform: none;
  color: var(--text-muted);
}
.config-table code {
  font-family: var(--mono);
  font-size: .85rem;
  background: var(--chip-bg);
  padding: .1rem .35rem;
  border-radius: 4px;
}
.config-table .val { font-family: var(--mono); color: var(--text); white-space: nowrap; }

.glossary-tip {
  border-bottom: 1.5px dashed color-mix(in srgb, var(--hf-yellow) 80%, #888);
  cursor: help;
  position: relative;
}
.tooltip-pop {
  position: absolute;
  z-index: 40;
  max-width: 280px;
  background: #111827;
  color: #f9fafb;
  padding: .65rem .75rem;
  border-radius: 8px;
  font-size: .82rem;
  line-height: 1.45;
  box-shadow: var(--shadow-hover);
  pointer-events: none;
  transform: translateY(-100%);
  margin-top: -8px;
}

/* Learn path */
.lesson-list { display: grid; gap: 1rem; padding: 1.25rem 0 3rem; }
.lesson-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 1.15rem 1.25rem;
  box-shadow: var(--shadow);
}
.lesson-card h2 { margin: 0 0 .35rem; font-size: 1.15rem; }
.lesson-meta { color: var(--text-muted); font-size: .85rem; margin-bottom: .75rem; }
.lesson-card details { margin-top: .5rem; }
.lesson-card summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
  padding: .4rem 0;
}
.related-links { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .6rem; }
.related-links a {
  font-size: .82rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .25rem .65rem;
  color: var(--text-secondary);
  background: var(--bg-soft);
  text-decoration: none;
}
.related-links a:hover {
  border-color: var(--hf-yellow);
  color: var(--text);
}

/* Glossary page */
.glossary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: .85rem;
  padding: 1.25rem 0 3rem;
}
.glossary-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .9rem 1rem;
  background: var(--bg-card);
}
.glossary-item h3 {
  margin: 0 0 .35rem;
  font-size: .98rem;
  display: flex; align-items: center; gap: .4rem;
}
.glossary-item h3::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--hf-yellow);
  flex-shrink: 0;
}
.glossary-item p {
  margin: 0;
  color: var(--text-secondary);
  font-size: .88rem;
}

/* About */
.about-box {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.4rem;
  background: var(--bg-soft);
  margin: 1rem 0;
}
.warn-box {
  border-left: 4px solid var(--hf-yellow);
  background: var(--hf-yellow-soft);
  padding: 1rem 1.1rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1rem 0;
  color: var(--text);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0 2.5rem;
  color: var(--text-muted);
  font-size: .85rem;
}
.site-footer .row {
  display: flex; flex-wrap: wrap; gap: .75rem;
  justify-content: space-between; align-items: center;
}

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

.btn {
  display: inline-flex; align-items: center; gap: .4rem;
  border-radius: 999px;
  padding: .55rem 1rem;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  font-size: .9rem;
}
.btn:hover { text-decoration: none; border-color: var(--border-strong); }
.btn-primary {
  background: var(--hf-yellow);
  border-color: var(--hf-yellow);
  color: #111;
}
.btn-primary:hover { background: var(--hf-yellow-hover); color: #111; }

@media (max-width: 720px) {
  .nav-links { display: none; }
  .brand-sub { display: none; }
  .detail-title { flex-direction: column; }
}

/* GitHub watch teaching page */
.gh-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  padding: 1.25rem 0 3rem;
}
@media (min-width: 960px) {
  .gh-layout {
    grid-template-columns: 1.1fr 1fr;
    align-items: start;
  }
}
.teach-panel, .watch-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 1.1rem 1.2rem;
  box-shadow: var(--shadow);
}
.teach-panel h2, .watch-panel h2 { margin-top: 0; }
.gh-repo-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .9rem 1rem;
  margin: .7rem 0;
  background: var(--bg-soft);
}
.gh-repo-card h3 {
  margin: 0 0 .25rem;
  font-size: 1rem;
  word-break: break-word;
}
.gh-repo-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  font-size: .78rem;
  color: var(--text-muted);
  margin: .35rem 0 .55rem;
}
.checklist {
  list-style: none;
  padding: 0;
  margin: .75rem 0 0;
}
.checklist li {
  padding: .45rem .65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin: .4rem 0;
  background: var(--bg-soft);
  color: var(--text-secondary);
  font-size: .9rem;
}
.checklist li::before {
  content: "☐ ";
  color: #111;
  background: var(--hf-yellow);
  border-radius: 4px;
  padding: 0 .2rem;
  margin-right: .35rem;
}


/* Online branding + live UI */
.online-badge {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  background: var(--hf-yellow);
  color: #111;
  font-size: .75rem;
  font-weight: 700;
  padding: .25rem .6rem;
  border-radius: 999px;
  letter-spacing: .02em;
}
.status-line {
  font-size: .88rem;
  color: var(--text-muted);
  margin: .75rem 0 .25rem;
  padding: .5rem .75rem;
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  border: 1px solid var(--border);
}
.status-line.status-ok { border-color: color-mix(in srgb, var(--success) 40%, var(--border)); }
.status-line.status-warn { border-color: color-mix(in srgb, var(--warn) 50%, var(--border)); color: var(--text-secondary); }
.tag.teach-badge {
  background: color-mix(in srgb, var(--hf-yellow) 55%, var(--chip-bg));
  color: #111;
  font-weight: 700;
}
.live-dot {
  color: var(--success);
  font-size: .65rem;
  vertical-align: middle;
}
.mode-tabs { gap: .4rem; }
.search-results-block { margin-bottom: 1.25rem; }
.search-results-block h3 { margin: 0 0 .75rem; font-size: 1.05rem; }
#warningBanner[hidden], #warnBanner[hidden] { display: none !important; }


/* === Hub multi-nav + Spaces embed === */
.topnav-multi { height: auto; min-height: var(--nav-h); padding: .45rem 0; }
.topnav-stack {
  flex-wrap: wrap;
  align-items: center;
  row-gap: .35rem;
}
.nav-cols {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  min-width: 0;
  flex: 1 1 auto;
}
.nav-hub { margin-left: 0; }
.nav-teach a {
  font-size: .82rem;
  opacity: .92;
}
.nav-teach::before {
  content: "教學";
  font-size: .7rem;
  color: var(--text-muted);
  margin-right: .35rem;
  align-self: center;
}
@media (max-width: 860px) {
  .nav-cols { width: 100%; order: 3; }
  .nav-links { margin-left: 0; }
}

.space-card .summary { -webkit-line-clamp: 2; }
.space-embed-wrap {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-soft);
  box-shadow: var(--shadow);
}
.space-embed {
  display: block;
  width: 100%;
  height: 70vh;
  min-height: 420px;
  border: 0;
  background: #fff;
}
[data-theme="dark"] .space-embed { background: #0b0f19; }