/* UI 网页原型站壳层样式 */
:root {
  --bg: #f1f5f9;
  --panel: #ffffff;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
  --sidebar-w: 280px;
  --top-h: 52px;
  --radius: 10px;
  --font: "SF Pro Text", "PingFang SC", "Segoe UI", system-ui, sans-serif;
}

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

html,
body {
  margin: 0;
  height: 100%;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
}

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

a:hover {
  text-decoration: underline;
}

.topbar {
  height: var(--top-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar__brand {
  font-weight: 700;
  font-size: 15px;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.topbar__brand span {
  color: var(--accent);
}

.topbar__meta {
  color: var(--muted);
  font-size: 12px;
}

.topbar__spacer {
  flex: 1;
}

.topbar__search {
  width: min(360px, 42vw);
  height: 34px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #f8fafc;
  font-size: 13px;
  outline: none;
}

.topbar__search:focus {
  border-color: var(--accent);
  background: #fff;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}

.btn:hover {
  background: #f8fafc;
  text-decoration: none;
}

.btn--primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn--primary:hover {
  background: #1d4ed8;
}

/* —— index —— */
.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

.hero {
  margin-bottom: 24px;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: 24px;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0 0;
}

.stat {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--muted);
}

.stat strong {
  color: var(--text);
  font-size: 14px;
  margin-right: 4px;
}

.group {
  margin-top: 28px;
}

.group__title {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.list {
  display: grid;
  gap: 8px;
}

.card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
}

.card__title {
  font-size: 14px;
  font-weight: 650;
  margin: 0 0 4px;
}

.card__meta {
  font-size: 12px;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.card__actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.card.is-hidden-by-search {
  display: none;
}

.group.is-empty {
  display: none;
}

.empty {
  padding: 48px 16px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

/* —— viewer —— */
.viewer {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: calc(100% - var(--top-h));
}

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  overflow: auto;
  padding: 12px 0 24px;
}

.side-search {
  margin: 0 12px 12px;
  width: calc(100% - 24px);
  height: 34px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #f8fafc;
  font-size: 12px;
  outline: none;
}

.side-search:focus {
  border-color: var(--accent);
  background: #fff;
}

.side-group {
  margin-bottom: 8px;
}

.side-group__title {
  padding: 8px 16px 4px;
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.side-link {
  display: block;
  padding: 7px 16px;
  font-size: 13px;
  color: #334155;
  border-right: 3px solid transparent;
  text-decoration: none;
  line-height: 1.35;
}

.side-link:hover {
  background: #f8fafc;
  text-decoration: none;
}

.side-link.is-active {
  background: var(--accent-soft);
  color: var(--accent);
  border-right-color: var(--accent);
  font-weight: 650;
}

.side-link.is-hidden-by-search {
  display: none;
}

.side-group.is-empty {
  display: none;
}

.main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: #e2e8f0;
}

.toolbar {
  height: 40px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}

.toolbar__title {
  color: var(--text);
  font-weight: 650;
  font-size: 13px;
}

.toolbar__path {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.frame-wrap {
  flex: 1;
  min-height: 0;
  position: relative;
}

.frame-wrap iframe {
  width: 100%;
  height: 100%;
  border: 0;
  background: #fff;
}

.frame-veil {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f8fafc;
  color: var(--muted);
  font-size: 13px;
  z-index: 2;
}

.frame-veil.is-hidden {
  display: none;
}

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

  .sidebar {
    display: none;
  }

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

  .card__actions {
    justify-content: flex-start;
  }
}