/* ===== TOKENS ===== */
:root,
[data-theme="light"] {
  --bg: #fafaf9;
  --bg-elevated: #ffffff;
  --bg-subtle: #f5f5f4;
  --bg-hover: #f0efed;
  --text: #1c1917;
  --text-secondary: #57534e;
  --text-tertiary: #a8a29e;
  --border: #e7e5e4;
  --border-strong: #d6d3d1;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --accent-hover: #1d4ed8;
  --green: #16a34a;
  --green-soft: rgba(22, 163, 74, 0.1);
  --amber: #d97706;
  --amber-soft: rgba(217, 119, 6, 0.1);
  --red: #dc2626;
  --red-soft: rgba(220, 38, 38, 0.1);
  --purple: #7c3aed;
  --purple-soft: rgba(124, 58, 237, 0.08);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
}

[data-theme="dark"] {
  --bg: #0c0a09;
  --bg-elevated: #1c1917;
  --bg-subtle: #1c1917;
  --bg-hover: #292524;
  --text: #fafaf9;
  --text-secondary: #a8a29e;
  --text-tertiary: #78716c;
  --border: #292524;
  --border-strong: #44403c;
  --accent: #60a5fa;
  --accent-soft: rgba(96, 165, 250, 0.1);
  --accent-hover: #93bbfd;
  --green: #4ade80;
  --green-soft: rgba(74, 222, 128, 0.12);
  --amber: #fbbf24;
  --amber-soft: rgba(251, 191, 36, 0.12);
  --red: #f87171;
  --red-soft: rgba(248, 113, 113, 0.12);
  --purple: #a78bfa;
  --purple-soft: rgba(167, 139, 250, 0.1);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 15px;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

code {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.88em;
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
}

img { max-width: 100%; border-radius: var(--radius-md); }

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0 1.5rem;
  height: 56px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  backdrop-filter: blur(12px);
}

.header-left { flex-shrink: 0; }
.header-right { margin-left: auto; display: flex; gap: 0.5rem; align-items: center; }

.brand {
  display: inline-flex;
  gap: 0.6rem;
  align-items: center;
  color: var(--text);
  font-weight: 700;
  font-size: 0.95rem;
  min-width: 0;
}

.brand-subtitle {
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-tertiary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-mark {
  display: inline-flex;
  width: 32px; height: 32px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: white;
}

.site-nav {
  display: flex;
  gap: 0.25rem;
  margin-left: 1.5rem;
}

.nav-link {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

.nav-link:hover {
  background: var(--bg-hover);
  color: var(--text);
  text-decoration: none;
}

/* Search trigger */
.search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--text-tertiary);
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.search-trigger:hover {
  border-color: var(--border-strong);
  background: var(--bg-hover);
}

.search-trigger kbd {
  padding: 0.15em 0.4em;
  border-radius: 4px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-family: inherit;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

/* Theme toggle */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.theme-toggle:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
}

[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }

/* Search modal */
.search-modal {
  position: fixed;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: min(560px, 90vw);
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-lg);
}

.search-modal::backdrop {
  background: rgba(0,0,0,0.4);
  backdrop-filter: blur(4px);
}

.search-modal-form {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  color: var(--text-tertiary);
}

.search-modal-form input {
  flex: 1;
  border: none;
  background: transparent;
  font: inherit;
  font-size: 1.05rem;
  color: var(--text);
  outline: none;
}

.search-modal-form kbd {
  padding: 0.2em 0.5em;
  border-radius: 4px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  font-family: inherit;
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

/* ===== LAYOUT ===== */
.page-shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* ===== HERO (legacy) ===== */
.hero {
  padding: 3rem 2.5rem;
  margin-bottom: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  background: var(--bg-elevated);
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  font-weight: 700;
}

.hero h1 {
  margin: 0;
  font-family: "Newsreader", Georgia, serif;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.lede {
  max-width: 48rem;
  margin-top: 0.75rem;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ===== HERO FEATURED (entry points as primary) ===== */
.hero-featured {
  margin-bottom: 2rem;
}

.hero-featured .section-heading h2 {
  font-size: 1.4rem;
}

.hero-featured .featured-grid {
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.hero-featured .featured-card {
  padding: 1.25rem 1.4rem;
  gap: 0.4rem;
}

.hero-featured .featured-card strong {
  font-size: 1rem;
}

.hero-featured .featured-card p {
  -webkit-line-clamp: 4;
}

/* ===== STATS BAR ===== */
.stats-bar {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.stat-row {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}

.stat-card {
  display: flex;
  flex-direction: column;
  padding: 0.85rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
  min-width: 100px;
}

.stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1;
  color: var(--text);
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  font-weight: 500;
  margin-top: 0.25rem;
}

/* ===== SECTIONS ===== */
.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.section-heading h1,
.section-heading h2 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
}

.see-all {
  font-size: 0.85rem;
  font-weight: 500;
}

/* ===== COLLECTIONS ===== */
.collections-section {
  margin-bottom: 2rem;
}

.collection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.collection-card {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.collection-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.collection-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.collection-header h3 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
}

.collection-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.collection-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.4rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
}

.collection-list li a {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.year-tag {
  flex-shrink: 0;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}

.more-count {
  margin: 0.5rem 0 0;
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* ===== BADGES & PILLS ===== */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  padding: 0.15em 0.5em;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2em 0.6em;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: capitalize;
}

.status-badge.status-complete,
.status-badge.status-active { background: var(--green-soft); color: var(--green); }
.status-badge.status-draft,
.status-badge.status-seed { background: var(--amber-soft); color: var(--amber); }
.status-badge.status-queued { background: var(--purple-soft); color: var(--purple); }

.status-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-dot.status-complete,
.status-dot.status-active { background: var(--green); }
.status-dot.status-draft,
.status-dot.status-seed { background: var(--amber); }
.status-dot.status-queued { background: var(--purple); }

.type-badge {
  display: inline-flex;
  padding: 0.2em 0.6em;
  border-radius: 999px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.type-badge.small { font-size: 0.7rem; padding: 0.15em 0.45em; }

.meta-pill {
  display: inline-flex;
  padding: 0.2em 0.55em;
  border-radius: 999px;
  background: var(--bg-subtle);
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.meta-pill.small { font-size: 0.7rem; padding: 0.15em 0.4em; }

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag-pill {
  display: inline-flex;
  padding: 0.2em 0.55em;
  border-radius: 999px;
  background: var(--accent-soft);
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 500;
  transition: background 0.15s;
}

.tag-pill:hover { background: rgba(37, 99, 235, 0.15); text-decoration: none; }
.tag-pill.active { background: var(--accent); color: white; }
.tag-pill.small { font-size: 0.7rem; padding: 0.15em 0.4em; }
.tag-pill.muted { background: var(--bg-subtle); color: var(--text-tertiary); }

/* ===== FEATURED ===== */
.featured-section { margin-bottom: 2rem; }

.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
}

.featured-card {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
}

.featured-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
  text-decoration: none;
  color: var(--text);
}

.featured-card strong { font-size: 0.9rem; }

.featured-card p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== TWO-UP GRID ===== */
.grid.two-up {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 1.5rem;
}

/* ===== PANELS ===== */
.panel {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
}

/* ===== SECTION LIST (home sidebar) ===== */
.section-list { display: grid; gap: 0.5rem; }

.section-block {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
  overflow: hidden;
}

.section-block summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.section-block summary::-webkit-details-marker { display: none; }

.section-block summary h3 {
  margin: 0;
  font-size: 0.88rem;
  font-weight: 600;
}

.section-block[open] summary {
  border-bottom: 1px solid var(--border);
}

.section-block ul {
  margin: 0;
  padding: 0.5rem 1rem 0.75rem;
  list-style: none;
}

.section-block li {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0;
  font-size: 0.85rem;
}

.section-block li a {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ===== ACTIVITY ===== */
.activity-list { display: grid; gap: 0.5rem; }

.activity-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-subtle);
}

.activity-date {
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
  padding-top: 0.1rem;
}

.activity-kind {
  display: inline-flex;
  padding: 0.15em 0.45em;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.activity-item p {
  margin: 0.25rem 0 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ===== CONTENT LAYOUT (page view) ===== */
.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 1.5rem;
  align-items: start;
}

.article-panel {
  padding: 2rem;
  overflow: hidden;
  min-width: 0;
}

.article-header {
  margin-bottom: 0.75rem;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  flex-wrap: wrap;
  font-size: 0.82rem;
}

.breadcrumbs a {
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: background 0.15s;
}

.breadcrumbs a:hover {
  background: var(--bg-hover);
  text-decoration: none;
}

.breadcrumb-sep { color: var(--text-tertiary); font-size: 0.75rem; }

.article-meta-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.75rem 0;
  margin-bottom: 0.5rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* ===== PROSE ===== */
.prose {
  font-size: 0.98rem;
  line-height: 1.75;
  overflow-wrap: break-word;
  word-break: break-word;
  min-width: 0;
}

.prose h1 {
  font-family: "Newsreader", Georgia, serif;
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  line-height: 1.15;
  margin-top: 0;
  letter-spacing: -0.02em;
}

.prose h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 2rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.prose h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 1.5rem;
}

.prose ul, .prose ol {
  padding-left: 1.25rem;
}

.prose li {
  margin: 0.35rem 0;
}

.prose strong { font-weight: 600; }

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.9rem;
}

.prose th {
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border);
  text-align: left;
  background: var(--bg-subtle);
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
}

.prose td {
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border);
}

.prose tr:hover td {
  background: var(--bg-hover);
}

.prose pre {
  overflow-x: auto;
  padding: 1rem;
  border-radius: var(--radius-md);
  background: #1e1e2e;
  color: #cdd6f4;
  font-size: 0.88rem;
  border: 1px solid var(--border);
}

.prose pre code {
  background: transparent;
  border: none;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

.prose blockquote {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
}

.prose a { text-decoration: underline; text-underline-offset: 2px; text-decoration-color: var(--border-strong); }
.prose a:hover { text-decoration-color: var(--accent); }

.prose hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

/* ===== SIDEBAR ===== */
.sidebar-panel {
  position: sticky;
  top: 72px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sidebar-block {
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  margin-bottom: 0.75rem;
}

.sidebar-block h3 {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  font-weight: 700;
}

.sidebar-meta {
  display: flex;
  justify-content: space-between;
  padding: 0.35rem 0;
  font-size: 0.82rem;
  border-bottom: 1px solid var(--border);
}

.sidebar-meta:last-child { border-bottom: none; }

.meta-label { color: var(--text-tertiary); font-weight: 500; }

.sidebar-meta code {
  font-size: 0.78rem;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.backlink-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.backlink-list li {
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}

.backlink-list li:last-child { border-bottom: none; }

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.quick-links a {
  padding: 0.3rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--text-secondary);
  transition: background 0.15s, border-color 0.15s;
}

.quick-links a:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
  text-decoration: none;
}

/* ===== PAPERS PAGE ===== */
.papers-page { max-width: 960px; }

.collection-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.chip {
  display: inline-flex;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.15s;
}

.chip:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

.chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.papers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 0.75rem;
}

.paper-card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
  overflow: hidden;
  min-width: 0;
}

.paper-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
  text-decoration: none;
  color: var(--text);
}

.paper-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.paper-card-header strong {
  font-size: 0.9rem;
  line-height: 1.3;
}

.paper-card-meta {
  display: flex;
  gap: 0.3rem;
}

.paper-card p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.paper-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-top: auto;
}

/* ===== TAGS PAGE ===== */
.tags-page { max-width: 960px; }

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 2rem;
}

.tag-cloud-item {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.15s;
}

.tag-cloud-item:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

.tag-cloud-item.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.tag-cloud-item.active .tag-count { color: rgba(255,255,255,0.7); }

.tag-count {
  font-size: 0.72rem;
  color: var(--text-tertiary);
  font-weight: 700;
}

.tag-results { margin-top: 1rem; }
.tag-results h2 { font-size: 1rem; margin-bottom: 1rem; }

/* ===== SEARCH PAGE ===== */
.search-page { max-width: 720px; }

.search-inline {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  margin-bottom: 1.5rem;
  color: var(--text-tertiary);
}

.search-inline input {
  flex: 1;
  border: none;
  background: transparent;
  font: inherit;
  font-size: 1.05rem;
  color: var(--text);
  outline: none;
}

.search-meta {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.search-results { display: grid; gap: 0.75rem; }

.search-result-card {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-result-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: var(--text);
}

.search-result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.search-result-path {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  font-family: "JetBrains Mono", monospace;
}

.search-result-card p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ===== FOOTER ===== */
.site-footer {
  max-width: 1280px;
  margin: 3rem auto 0;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

.site-footer p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* ===== GRAPH PAGE ===== */
.graph-page { max-width: 100%; }

.graph-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
}

.graph-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.legend-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.graph-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.graph-controls .chip {
  cursor: pointer;
  font: inherit;
}

.graph-container {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  overflow: hidden;
  position: relative;
}

#graph-svg {
  display: block;
  width: 100%;
  cursor: grab;
}

#graph-svg:active { cursor: grabbing; }

.graph-link {
  stroke: var(--border-strong);
  stroke-width: 1.2;
  stroke-opacity: 0.5;
}

.graph-node {
  cursor: pointer;
  stroke: var(--bg-elevated);
  stroke-width: 1.5;
  transition: r 0.2s;
}

.graph-node:hover {
  filter: brightness(1.2);
}

.graph-label {
  font-size: 10px;
  fill: var(--text-secondary);
  pointer-events: none;
  font-family: "Inter", sans-serif;
}

.graph-tooltip {
  display: none;
  position: fixed;
  z-index: 100;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-lg);
  font-size: 0.85rem;
  max-width: 320px;
  pointer-events: none;
}

.graph-tooltip strong {
  display: block;
  margin-bottom: 0.3rem;
  font-size: 0.9rem;
}

/* ===== TIMELINE PAGE ===== */
.timeline-page { max-width: 100%; }

.timeline-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.timeline-filters .chip {
  cursor: pointer;
  font: inherit;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.timeline-filters .badge.small {
  font-size: 0.68rem;
  padding: 0.1em 0.4em;
  min-width: 18px;
}

.timeline-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.timeline-lane {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  overflow: hidden;
}

.lane-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-subtle);
}

.lane-header h3 {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 700;
}

.lane-track {
  display: flex;
  gap: 0;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
}

.lane-track::-webkit-scrollbar {
  height: 6px;
}

.lane-track::-webkit-scrollbar-track {
  background: var(--bg-subtle);
  border-radius: 3px;
}

.lane-track::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}

.year-marker {
  display: flex;
  align-items: center;
  padding: 0 0.75rem 0 0;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--accent);
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  flex-shrink: 0;
}

.timeline-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex-shrink: 0;
  width: 180px;
  padding: 0.5rem;
  text-decoration: none;
  color: var(--text);
  position: relative;
}

.timeline-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg-elevated);
  box-shadow: 0 0 0 2px var(--border);
  margin-bottom: 0.5rem;
  flex-shrink: 0;
  transition: transform 0.2s, box-shadow 0.2s;
}

.timeline-node:hover .timeline-dot {
  transform: scale(1.4);
  box-shadow: 0 0 0 3px var(--accent);
}

.timeline-card {
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  width: 100%;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.timeline-node:hover .timeline-card {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.timeline-card strong {
  display: block;
  font-size: 0.78rem;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.timeline-card-meta {
  display: flex;
  gap: 0.25rem;
  margin-top: 0.3rem;
}

/* ===== CITATION BADGE (paper cards) ===== */
.citation-count {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.72rem;
  color: var(--text-tertiary);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.citation-count svg {
  flex-shrink: 0;
}

/* ===== UTILITIES ===== */
.muted { color: var(--text-secondary); font-size: 0.88rem; }

/* ===== RESPONSIVE ===== */
@media (max-width: 980px) {
  .grid.two-up,
  .content-layout {
    grid-template-columns: 1fr;
  }

  .sidebar-panel {
    position: static;
  }

  .site-nav {
    display: none;
  }

  .search-trigger span { display: none; }
  .brand-subtitle { display: none; }
}

@media (max-width: 720px) {
  .page-shell { padding: 0.75rem; }
  .site-header { padding: 0 0.75rem; gap: 0.5rem; }
  .hero { padding: 1.25rem; }
  .article-panel { padding: 1rem; }
  .stats-bar { gap: 0.5rem; }
  .stat-row { gap: 0.5rem; }
  .stat-card { padding: 0.6rem 0.85rem; min-width: 70px; }
  .stat-num { font-size: 1.2rem; }
  .collection-grid { grid-template-columns: 1fr; }
  .papers-grid { grid-template-columns: 1fr; }
  .featured-grid { grid-template-columns: 1fr; }

  /* Header: truncate brand text */
  .brand {
    font-size: 0.85rem;
    min-width: 0;
  }
  .brand span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  /* Search trigger: icon only */
  .search-trigger { padding: 0.4rem 0.5rem; }
  .search-trigger kbd { display: none; }

  /* Collection list: allow wrapping */
  .collection-list li a {
    white-space: normal;
    overflow: visible;
    text-overflow: unset;
  }
  .collection-list li {
    font-size: 0.82rem;
  }
  .collection-card { padding: 1rem; }

  /* Prose: smaller text and better mobile fit */
  .prose { font-size: 0.88rem; line-height: 1.7; }
  .prose h1 { font-size: clamp(1.4rem, 5vw, 1.8rem); }
  .prose h2 { font-size: 1.1rem; margin-top: 1.5rem; }
  .prose h3 { font-size: 0.95rem; margin-top: 1.25rem; }
  .prose ul, .prose ol { padding-left: 1rem; }
  .prose li { font-size: 0.86rem; }

  /* Tables: horizontal scroll */
  .prose table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    font-size: 0.78rem;
  }
  .prose th, .prose td {
    padding: 0.4rem 0.6rem;
    white-space: nowrap;
  }

  /* Code blocks / ASCII diagrams: smaller font, ensure scroll */
  .prose pre {
    font-size: 0.7rem;
    padding: 0.75rem;
    -webkit-overflow-scrolling: touch;
  }

  /* Article meta bar */
  .article-meta-bar { gap: 0.3rem; padding: 0.5rem 0; }

  /* Breadcrumbs */
  .breadcrumbs { font-size: 0.75rem; }

  /* Featured cards */
  .hero-featured .section-heading h2 { font-size: 1.15rem; }
  .hero-featured .featured-card { padding: 1rem; }
  .hero-featured .featured-card strong { font-size: 0.9rem; }
  .hero-featured .featured-card p { font-size: 0.82rem; }

  /* Paper cards */
  .paper-card { padding: 0.85rem; }
  .paper-card-header strong { font-size: 0.84rem; }
  .paper-card p { font-size: 0.78rem; }

  /* Tags / chips */
  .chip { padding: 0.3rem 0.65rem; font-size: 0.78rem; }
  .chips-row { gap: 0.3rem; }

  /* Sidebar: tighter */
  .sidebar-block { padding: 0.75rem 1rem; }
  .sidebar-meta { font-size: 0.78rem; }

  /* Section headings */
  .section-heading h1,
  .section-heading h2 { font-size: 1rem; }

  /* Stat label */
  .stat-label { font-size: 0.7rem; }

  /* Eyebrow */
  .eyebrow { font-size: 0.65rem; }
}

/* Extra small phones */
@media (max-width: 400px) {
  .page-shell { padding: 0.5rem; }
  .site-header { height: 48px; }
  .brand-mark { width: 28px; height: 28px; font-size: 0.8rem; }
  .brand { font-size: 0.8rem; gap: 0.4rem; }
  .stat-card { min-width: 60px; padding: 0.5rem 0.65rem; }
  .stat-num { font-size: 1rem; }
  .stat-label { font-size: 0.65rem; }
  .prose { font-size: 0.84rem; }
  .prose pre { font-size: 0.62rem; }
  .prose table { font-size: 0.72rem; }
  .hero-featured .featured-card { padding: 0.85rem; }
  .collection-card { padding: 0.85rem; }
}