:root {
  --bg: #eef2f7;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --border: #dbe3ef;
  --text: #1e293b;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-soft: #eff6ff;
  --yellow-soft: #fef9c3;
  --yellow-border: #fde047;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.hidden { display: none !important; }

.demo-badge {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 5px 10px;
  border-radius: 8px;
  background: #0f172a;
  color: #f8fafc;
  font-size: 11px;
  font-weight: 600;
}

.demo-back {
  position: fixed;
  top: 10px;
  right: 10px;
  z-index: 200;
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  font-size: 12px;
  box-shadow: var(--shadow);
}

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  padding: 10px 16px;
  border-radius: 8px;
  background: #0f172a;
  color: #fff;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 300;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.shell {
  display: grid;
  grid-template-rows: 48px 1fr;
  min-height: 100vh;
}

.shell-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.shell-header h1 { margin: 0; font-size: 16px; }
.shell-header span { font-size: 12px; color: var(--muted); }

.shell-body {
  display: grid;
  grid-template-columns: 200px 1fr;
  min-height: 0;
}

.sidebar {
  border-right: 1px solid var(--border);
  background: var(--panel-soft);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
}

.sidebar-item {
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--muted);
}

.sidebar-item.indent { padding-left: 22px; font-size: 12px; }

.sidebar-item.active {
  background: var(--accent-soft);
  color: #1e40af;
  font-weight: 600;
}

.workspace {
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: auto;
  padding: 12px 16px 20px;
  gap: 10px;
}

.node-type-switch {
  display: inline-flex;
  gap: 4px;
  padding: 3px;
  border-radius: 8px;
  background: var(--panel-soft);
  border: 1px solid var(--border);
  width: fit-content;
}

.node-type-switch button {
  border: none;
  background: transparent;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
}

.node-type-switch button.active {
  background: var(--panel);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
}

.ov-panel {
  flex: 1;
  min-height: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: auto;
}

.ov-zone {
  padding: 18px 20px 24px;
  max-width: 920px;
}

.ov-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  margin-bottom: 16px;
}

.ov-crumb {
  border: none;
  background: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 12px;
  padding: 0;
}

.ov-crumb.current { color: var(--text); font-weight: 600; }
.ov-crumb-sep { color: var(--muted); }

.ov-hero {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.ov-thumb {
  flex: 0 0 112px;
  width: 112px;
  height: 112px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, #e0e7ff, #f0fdf4);
  display: flex;
  align-items: center;
  justify-content: center;
}

.ov-thumb-ph { font-size: 36px; }

.ov-title {
  margin: 0 0 6px;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
}

.ov-type {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--panel-soft);
  border: 1px solid var(--border);
  color: var(--muted);
  margin-bottom: 8px;
}

.ov-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
}

.ov-meta {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
  padding: 12px;
  border-radius: 8px;
  background: var(--panel-soft);
  border: 1px solid var(--border);
  margin-bottom: 18px;
}

.ov-meta-item { display: flex; flex-direction: column; gap: 2px; }
.ov-meta-key { font-size: 10px; font-weight: 700; text-transform: uppercase; color: var(--muted); }
.ov-meta-val { font-size: 13px; font-weight: 500; }

.ov-section-title {
  margin: 0 0 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.ov-memory { margin-bottom: 20px; }

.ov-mem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}

.ov-mem-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--panel);
}

.ov-mem-head { display: flex; gap: 10px; align-items: flex-start; }
.ov-mem-head strong { display: block; font-size: 13px; }
.ov-mem-sub { font-size: 11px; color: var(--muted); }
.ov-mem-meta { margin: 0; font-size: 12px; color: var(--muted); }
.ov-mem-excerpt { margin: 0; font-size: 12px; line-height: 1.4; }
.ov-mem-recent { margin: 0; padding-left: 16px; font-size: 12px; color: var(--muted); }

.ov-children { margin-bottom: 20px; }

.ov-children-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
}

.ov-child-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: inherit;
}

.ov-child-card:hover { border-color: #93c5fd; background: var(--accent-soft); }
.ov-child-card.is-folder { background: var(--yellow-soft); border-color: var(--yellow-border); }
.ov-child-icon { font-size: 18px; }
.ov-child-title { font-size: 14px; font-weight: 600; }
.ov-child-type { font-size: 10px; color: var(--muted); }

.ov-mode-links { display: flex; flex-direction: column; gap: 16px; }
.ov-mode-links.compact .ov-mode-btns { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }

.ov-mode-btns {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 8px;
}

.ov-mode-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  cursor: pointer;
  font-size: 13px;
  text-align: left;
}

.ov-mode-btn:hover { border-color: #93c5fd; background: var(--accent-soft); }

.ov-btn {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  background: var(--panel);
}

.ov-btn-ghost { align-self: flex-start; }
.ov-btn-ghost:hover { background: var(--accent-soft); border-color: #93c5fd; }

.ov-surface-tabs,
.ov-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}

.ov-surface-tabs button,
.ov-pills button {
  border: 1px solid var(--border);
  background: var(--panel-soft);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
}

.ov-surface-tabs button.active,
.ov-pills button.active {
  background: var(--accent-soft);
  border-color: #93c5fd;
  color: #1e40af;
}

.ov-preview-pane { padding: 20px; text-align: center; }

.ov-preview-large {
  min-height: 240px;
  border: 2px dashed var(--border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(160deg, #f0f9ff, #faf5ff);
}

.ov-preview-large span { font-size: 48px; }
.ov-preview-large p { margin: 0; font-size: 12px; color: var(--muted); }

.ov-desc-pane { padding: 8px 4px; line-height: 1.55; }
.ov-desc-pane h3 { margin: 0 0 8px; }

.ov-surface-host { display: flex; flex-direction: column; min-height: 0; flex: 1; }

[data-surface-panel="overview"] { display: block; }

.ov-command {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.ov-command input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
}

.ov-command-list {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.ov-command-list button {
  display: block;
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  border: none;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  cursor: pointer;
  font-size: 13px;
}

.ov-command-list button:last-child { border-bottom: 0; }
.ov-command-list button:hover { background: var(--accent-soft); }

details.ov-acc {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
  background: var(--panel);
}

details.ov-acc summary {
  padding: 10px 12px;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  list-style: none;
}

details.ov-acc summary::-webkit-details-marker { display: none; }
details.ov-acc .ov-acc-body { padding: 0 12px 12px; }

.ov-dock {
  position: sticky;
  bottom: 0;
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 10px;
  margin-top: auto;
  background: rgba(255, 255, 255, 0.92);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(8px);
}

.ov-dock button {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.ov-dock button:hover { background: var(--accent-soft); }

.ov-stepper {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 16px;
  border-left: 2px solid var(--border);
  padding-left: 14px;
}

.ov-step {
  position: relative;
  padding: 8px 0 8px 8px;
  font-size: 13px;
  color: var(--muted);
}

.ov-step.active { color: var(--text); font-weight: 600; }
.ov-step::before {
  content: "";
  position: absolute;
  left: -19px;
  top: 12px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
}

.ov-step.active::before { background: var(--accent); }

.ov-infobox {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  background: var(--panel-soft);
  font-size: 12px;
}

.ov-infobox h4 { margin: 0 0 8px; font-size: 13px; }
.ov-infobox dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 4px 10px; }
.ov-infobox dt { color: var(--muted); font-weight: 600; }
.ov-infobox dd { margin: 0; }

.ov-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
}

.ov-gallery-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
  background: var(--panel);
  text-align: left;
  font: inherit;
  padding: 0;
}

.ov-gallery-cover {
  height: 72px;
  background: linear-gradient(135deg, #ddd6fe, #bfdbfe);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.ov-gallery-card span { display: block; padding: 8px 10px; font-size: 13px; font-weight: 600; }

.ov-inner-rail {
  display: flex;
  gap: 0;
  min-height: 360px;
}

.ov-inner-rail nav {
  width: 52px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 0;
  gap: 4px;
}

.ov-inner-rail nav button {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  font-size: 18px;
}

.ov-inner-rail nav button.active { background: var(--accent-soft); }

.ov-story {
  scroll-snap-type: y mandatory;
  overflow-y: auto;
  max-height: 520px;
}

.ov-story section {
  scroll-snap-align: start;
  min-height: 200px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.ov-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  min-height: 0;
}

.ov-compare-col {
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: auto;
  max-height: 560px;
}

.ov-compare-col h3 {
  margin: 0;
  padding: 10px 12px;
  font-size: 12px;
  background: var(--panel-soft);
  border-bottom: 1px solid var(--border);
}

.ov-table-meta {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  margin-bottom: 14px;
}

.ov-table-meta th,
.ov-table-meta td {
  border: 1px solid var(--border);
  padding: 6px 10px;
  text-align: left;
}

.ov-table-meta th {
  background: var(--panel-soft);
  font-weight: 600;
  width: 140px;
}

.ov-scroll-x {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.ov-scroll-x .ov-child-card { min-width: 160px; flex-shrink: 0; }

.ov-bento {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: minmax(80px, auto);
  gap: 10px;
}

.ov-bento .tile-preview { grid-column: span 2; grid-row: span 2; }
.ov-bento .tile-meta { grid-column: span 2; }
.ov-bento .tile-mem { grid-column: span 2; }
.ov-bento .tile-children { grid-column: span 4; }

.ov-bento .tile {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  background: var(--panel);
}

.ov-banner {
  position: relative;
  min-height: 140px;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 16px;
  background: linear-gradient(120deg, #1e3a8a, #4f46e5, #7c3aed);
  color: #fff;
  display: flex;
  align-items: flex-end;
  padding: 16px 18px;
}

.ov-banner .ov-title { color: #fff; margin: 0; }
.ov-banner .ov-type { background: rgba(255,255,255,0.2); border-color: transparent; color: #e0e7ff; }
.ov-banner .ov-desc { color: #e0e7ff; }

@media (max-width: 800px) {
  .shell-body { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .ov-compare { grid-template-columns: 1fr; }
  .ov-bento { grid-template-columns: 1fr 1fr; }
}