:root {
  color-scheme: light dark;
  --radius: 8px;
  --radius-sm: 6px;
  --content: 960px;
  --font: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* light (default) */
  --bg: #f6f4f1;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f0eeea;
  --border: #d9d4cc;
  --border-subtle: #e8e4dd;
  --text: #1a1816;
  --text-muted: #5c574f;
  --text-dim: #8a847a;
  --amber: #9a7b4a;
  --amber-soft: rgba(154, 123, 74, 0.12);
  --sage: #5f7354;
  --sage-soft: rgba(95, 115, 84, 0.12);
  --type-doc: #4a5f78;
  --type-doc-soft: rgba(74, 95, 120, 0.12);
  --type-col: #7a4d66;
  --type-col-soft: rgba(122, 77, 102, 0.12);
  --type-exp: #6b6340;
  --type-exp-soft: rgba(107, 99, 64, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0b0a;
    --bg-elevated: #141211;
    --bg-card: #161413;
    --bg-card-hover: #1c1917;
    --border: #2a2623;
    --border-subtle: #1f1c1a;
    --text: #f5f0e8;
    --text-muted: #a39e94;
    --text-dim: #6e6a63;
    --amber: #c4a574;
    --amber-soft: rgba(196, 165, 116, 0.14);
    --sage: #8a9a7b;
    --sage-soft: rgba(138, 154, 123, 0.14);
    --type-doc: #9aadc4;
    --type-doc-soft: rgba(130, 150, 180, 0.14);
    --type-col: #c4a0b4;
    --type-col-soft: rgba(180, 140, 160, 0.14);
    --type-exp: #b8ae8a;
    --type-exp-soft: rgba(160, 150, 120, 0.14);
  }
}

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

html {
  color-scheme: light dark;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 13.5px;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  max-width: var(--content);
  width: 100%;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 0.75rem;
}

.wordmark {
  display: inline-flex;
  flex-direction: row;
  align-items: baseline;
  gap: 0.6rem;
  transition: opacity 0.15s ease;
}

.wordmark:hover {
  opacity: 0.85;
}

.wordmark-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.wordmark-sub {
  font-size: 0.75rem;
  font-weight: 450;
  color: var(--text-muted);
  letter-spacing: 0.01em;
}

.main {
  flex: 1;
  max-width: var(--content);
  width: 100%;
  margin: 0 auto;
  padding: 0.25rem 1.25rem 1.75rem;
}

.site-footer {
  max-width: var(--content);
  width: 100%;
  margin: 0 auto;
  padding: 0.75rem 1.25rem 1.25rem;
  color: var(--text-dim);
  font-size: 0.7rem;
}

/* —— Home —— */
.home-intro {
  margin-bottom: 1rem;
  max-width: 36rem;
}

.home-intro p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.shelf-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.65rem;
}

@media (max-width: 720px) {
  .shelf-grid {
    grid-template-columns: 1fr;
  }

  .site-header,
  .main,
  .site-footer {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .wordmark {
    flex-direction: column;
    gap: 0.15rem;
  }
}

.shelf-card {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 0.85rem 0.95rem 0.8rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
  text-align: left;
  width: 100%;
  font: inherit;
  color: inherit;
}

.shelf-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border);
}

.shelf-card:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.shelf-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.shelf-card-title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.shelf-card-slug {
  display: inline-block;
  margin-top: 0.15rem;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--amber);
  background: var(--amber-soft);
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

.shelf-card-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.1rem;
  flex-shrink: 0;
  text-align: right;
}

.pin-count {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text);
}

.updated {
  font-size: 0.65rem;
  color: var(--text-dim);
}

.shelf-card-desc {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.75rem;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.shelf-card-previews {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.5rem;
}

.shelf-card-previews li {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.7rem;
  color: var(--text-muted);
  min-width: 0;
}

.preview-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--sage);
  flex-shrink: 0;
}

.preview-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* —— Shelf detail —— */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-bottom: 0.85rem;
  padding: 0;
  border: none;
  background: none;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s ease;
}

.back-link:hover {
  color: var(--text);
}

.back-link:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 4px;
}

.shelf-hero {
  margin-bottom: 1rem;
}

.shelf-hero-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.45rem 0.65rem;
  margin-bottom: 0.35rem;
}

.shelf-hero h1 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.shelf-hero-slug {
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--amber);
  background: var(--amber-soft);
  padding: 0.12rem 0.4rem;
  border-radius: 999px;
}

.shelf-hero-desc {
  margin: 0 0 0.45rem;
  color: var(--text-muted);
  max-width: 40rem;
  font-size: 0.8rem;
}

.shelf-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.7rem;
  color: var(--text-dim);
}

.pin-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.pin-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: background 0.15s ease, border-color 0.15s ease;
  color: inherit;
  text-decoration: none;
}

.pin-row:hover {
  background: var(--bg-card-hover);
  border-color: var(--border);
}

.pin-row:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.pin-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.pin-title-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.pin-title {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.type-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.6rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  background: var(--sage-soft);
  color: var(--sage);
}

.type-badge[data-type="folder"] {
  background: var(--amber-soft);
  color: var(--amber);
}

.type-badge[data-type="document"] {
  background: var(--type-doc-soft);
  color: var(--type-doc);
}

.type-badge[data-type="link"] {
  background: var(--sage-soft);
  color: var(--sage);
}

.type-badge[data-type="collection"] {
  background: var(--type-col-soft);
  color: var(--type-col);
}

.type-badge[data-type="export"] {
  background: var(--type-exp-soft);
  color: var(--type-exp);
}

.pin-note {
  margin: 0;
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.35;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.pin-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.meta-chip {
  display: inline-flex;
  align-items: center;
  font-size: 0.65rem;
  color: var(--text-dim);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  padding: 0.08rem 0.4rem;
  border-radius: 999px;
}

.pin-jump {
  flex-shrink: 0;
  align-self: center;
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--text-dim);
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease;
}

.pin-row:hover .pin-jump,
.pin-row:focus-visible .pin-jump {
  opacity: 1;
  color: var(--amber);
}

.empty-state {
  padding: 1.75rem 1rem;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
}

.empty-state h2 {
  margin: 0 0 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.empty-state p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.75rem;
  max-width: 28rem;
  margin-inline: auto;
}