/* ─── DIFS Research Gateway – Design System ─────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --c-navy:      #003566;
  --c-blue:      #0077b6;
  --c-sky:       #00b4d8;
  --c-bg:        #f0f4f8;
  --c-card:      #ffffff;
  --c-sidebar:   #f8fafc;
  --c-text:      #1a202c;
  --c-muted:     #64748b;
  --c-border:    #e2e8f0;
  --c-hover:     #f1f5f9;
  --radius:      10px;
  --shadow:      0 2px 12px rgba(0,53,102,.09);
  --shadow-lg:   0 6px 28px rgba(0,53,102,.14);
  --nav-h:       68px;
  --sidebar-w:   260px;
  --font:        'Inter', system-ui, -apple-system, sans-serif;
}

[data-theme="dark"] {
  --c-bg:        #0d1117;
  --c-card:      #161b22;
  --c-sidebar:   #0d1117;
  --c-text:      #e6edf3;
  --c-muted:     #8b949e;
  --c-border:    #21262d;
  --c-hover:     #1c2128;
  --shadow:      0 2px 12px rgba(0,0,0,.35);
  --shadow-lg:   0 6px 28px rgba(0,0,0,.55);
}

/* ─── Base ──────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  padding-top: var(--nav-h);
  transition: background .25s, color .25s;
}

a { color: var(--c-blue); text-decoration: none; }
a:hover { color: var(--c-sky); text-decoration: underline; }

img { max-width: 100%; }

.container-xl {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── Navbar ─────────────────────────────────────────────────────────────── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: var(--c-navy);
  z-index: 1000;
  display: flex;
  align-items: center;
  box-shadow: 0 2px 12px rgba(0,0,0,.3);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo { height: 44px; width: auto; }

.nav-title-block .nav-title {
  display: block;
  color: #fff;
  font-weight: 700;
  font-size: .95rem;
  line-height: 1.2;
}

.nav-title-block .nav-sub {
  display: block;
  color: rgba(255,255,255,.65);
  font-size: .75rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav-links .nav-link {
  color: rgba(255,255,255,.85);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: .9rem;
  font-weight: 500;
  transition: background .15s, color .15s;
  text-decoration: none;
}

.nav-links .nav-link:hover,
.nav-links .nav-link.active { background: rgba(255,255,255,.15); color: #fff; text-decoration: none; }

.btn-theme {
  background: rgba(255,255,255,.1);
  border: none;
  color: #fff;
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  transition: background .15s;
  margin-left: 6px;
}
.btn-theme:hover { background: rgba(255,255,255,.2); }

.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
  padding: 0;
}
.nav-hamburger span {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all .25s;
}

.nav-mobile {
  display: none;
  position: absolute;
  top: var(--nav-h);
  left: 0; right: 0;
  background: var(--c-navy);
  padding: 12px 24px 20px;
  border-top: 1px solid rgba(255,255,255,.1);
  flex-direction: column;
  gap: 4px;
}
.nav-mobile.open { display: flex; }
.nav-mobile .nav-link {
  color: rgba(255,255,255,.85);
  padding: 10px 14px;
  border-radius: 6px;
  font-size: .95rem;
  font-weight: 500;
  text-decoration: none;
}
.nav-mobile .nav-link:hover { background: rgba(255,255,255,.12); color: #fff; text-decoration: none; }

/* ─── Hero ───────────────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #001d3d 0%, #003566 55%, #0077b6 100%);
  padding: 72px 0 64px;
  color: #fff;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.hero-inner { position: relative; z-index: 1; }

.hero-label {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: rgba(255,255,255,.6);
  margin-bottom: 12px;
}

.hero-title {
  font-size: clamp(1.8rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,.8);
  max-width: 580px;
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn-hero-primary {
  background: #fff;
  color: var(--c-navy);
  font-weight: 600;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: .95rem;
  transition: all .2s;
  border: none;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
.btn-hero-primary:hover { background: #e0f0ff; color: var(--c-navy); text-decoration: none; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(0,0,0,.25); }

.btn-hero-outline {
  background: transparent;
  color: #fff;
  font-weight: 600;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: .95rem;
  border: 2px solid rgba(255,255,255,.45);
  transition: all .2s;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
.btn-hero-outline:hover { background: rgba(255,255,255,.12); color: #fff; text-decoration: none; border-color: rgba(255,255,255,.7); }

/* ─── About Division ─────────────────────────────────────────────────────── */
.about-division {
  background: var(--c-card);
  border-bottom: 1px solid var(--c-border);
  padding: 52px 0;
}
.about-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: start;
}
.about-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--c-navy);
  margin-bottom: 14px;
}
[data-theme="dark"] .about-title { color: var(--c-sky); }
.about-body {
  color: var(--c-muted);
  line-height: 1.75;
  margin-bottom: 10px;
  font-size: .97rem;
}
.about-body strong { color: var(--c-text); font-weight: 600; }
.about-pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  min-width: 260px;
}
.pillar {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: .82rem;
  font-weight: 500;
  color: var(--c-text);
  white-space: nowrap;
}
.pillar-icon { font-size: 1rem; flex-shrink: 0; }
@media (max-width: 700px) {
  .about-inner { grid-template-columns: 1fr; gap: 28px; }
  .about-pillars { grid-template-columns: 1fr 1fr; min-width: 0; }
}

/* ─── Stats Row ──────────────────────────────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 32px auto;
}

.stat-card {
  background: var(--c-card);
  border-radius: var(--radius);
  padding: 24px 20px;
  box-shadow: var(--shadow);
  text-align: center;
  border-left: 4px solid var(--c-blue);
  transition: box-shadow .2s, transform .2s;
}
.stat-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }

.stat-num {
  font-size: 2rem;
  font-weight: 700;
  color: var(--c-navy);
  line-height: 1;
  margin-bottom: 6px;
}
[data-theme="dark"] .stat-num { color: #60a5fa; }

.stat-label {
  font-size: .82rem;
  font-weight: 500;
  color: var(--c-muted);
  text-transform: uppercase;
  letter-spacing: .06em;
}

/* ─── Section headings ───────────────────────────────────────────────────── */
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 20px;
}
.section-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--c-text);
}
.section-link { font-size: .875rem; font-weight: 500; }

/* ─── Publication Card ───────────────────────────────────────────────────── */
.pub-card {
  background: var(--c-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px 22px;
  margin-bottom: 14px;
  transition: box-shadow .2s, transform .2s;
  border-left: 4px solid var(--c-border);
}
.pub-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

.pub-card-top {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.topic-badge {
  display: inline-block;
  color: #fff;
  font-size: .72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: .03em;
  flex-shrink: 0;
}

.pub-year {
  font-size: .8rem;
  font-weight: 600;
  color: var(--c-muted);
  padding: 3px 8px;
  background: var(--c-hover);
  border-radius: 4px;
  flex-shrink: 0;
}

.btn-bookmark {
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--c-muted);
  font-size: 1.15rem;
  padding: 0;
  line-height: 1;
  transition: color .15s, transform .15s;
  flex-shrink: 0;
}
.btn-bookmark:hover { color: #f59e0b; transform: scale(1.2); }
.btn-bookmark.saved { color: #f59e0b; }

.pub-title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 6px;
  color: var(--c-text);
}

.pub-authors {
  font-size: .855rem;
  color: var(--c-muted);
  margin-bottom: 4px;
}

.pub-meta {
  font-size: .835rem;
  color: var(--c-muted);
  margin-bottom: 12px;
}
.pub-meta em { font-style: italic; color: var(--c-text); font-weight: 500; }

.pub-abstract {
  font-size: .875rem;
  line-height: 1.65;
  color: var(--c-muted);
  background: var(--c-hover);
  border-radius: 6px;
  padding: 14px 16px;
  margin-bottom: 12px;
  display: none;
}
.pub-abstract.open { display: block; }

.pub-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.btn-link {
  background: none;
  border: 1px solid var(--c-border);
  color: var(--c-blue);
  font-size: .8rem;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 20px;
  cursor: pointer;
  transition: all .15s;
  text-decoration: none;
  display: inline-block;
  font-family: var(--font);
}
.btn-link:hover {
  background: var(--c-blue);
  color: #fff;
  border-color: var(--c-blue);
  text-decoration: none;
}

/* ─── Publications Layout ─────────────────────────────────────────────────── */
.pub-layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  gap: 24px;
  align-items: start;
  margin-top: 24px;
}

/* ─── Sidebar ─────────────────────────────────────────────────────────────── */
.pub-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 16px);
  background: var(--c-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  max-height: calc(100vh - var(--nav-h) - 40px);
  overflow-y: auto;
}

.sidebar-section { margin-bottom: 20px; }

.sidebar-title {
  font-size: .78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--c-muted);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-search {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font-size: .875rem;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font);
  outline: none;
  transition: border-color .15s;
  margin-bottom: 16px;
}
.sidebar-search:focus { border-color: var(--c-blue); }

.filter-list {
  list-style: none;
  max-height: 160px;
  overflow-y: auto;
}

.filter-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-size: .855rem;
  cursor: pointer;
  color: var(--c-text);
  user-select: none;
}
.filter-item:hover { color: var(--c-blue); }

.filter-item input[type="checkbox"] {
  accent-color: var(--c-blue);
  width: 14px;
  height: 14px;
  cursor: pointer;
  flex-shrink: 0;
}

.filter-count {
  margin-left: auto;
  font-size: .75rem;
  color: var(--c-muted);
  background: var(--c-hover);
  padding: 1px 6px;
  border-radius: 10px;
}

.btn-clear {
  width: 100%;
  padding: 8px;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font-size: .85rem;
  color: var(--c-muted);
  cursor: pointer;
  font-family: var(--font);
  transition: all .15s;
  margin-top: 4px;
}
.btn-clear:hover { background: #fee2e2; color: #dc2626; border-color: #fca5a5; }

/* ─── Results toolbar ─────────────────────────────────────────────────────── */
.results-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}

.results-count {
  font-size: .9rem;
  color: var(--c-muted);
}
.results-count strong { color: var(--c-text); }

.results-actions { display: flex; gap: 8px; align-items: center; }

.btn-sm {
  padding: 5px 14px;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font-size: .82rem;
  font-weight: 500;
  background: var(--c-card);
  color: var(--c-text);
  cursor: pointer;
  font-family: var(--font);
  transition: all .15s;
}
.btn-sm:hover { border-color: var(--c-blue); color: var(--c-blue); }

.btn-filters-mobile {
  display: none;
  padding: 9px 18px;
  background: var(--c-navy);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font);
  margin-bottom: 16px;
}

/* ─── View toggle ─────────────────────────────────────────────────────────── */
.view-toggle {
  display: flex;
  gap: 2px;
  background: var(--c-hover);
  border-radius: 8px;
  padding: 3px;
}
.view-btn {
  padding: 5px 13px;
  border: none;
  border-radius: 6px;
  background: none;
  color: var(--c-muted);
  font-size: .82rem;
  font-weight: 500;
  cursor: pointer;
  font-family: var(--font);
  transition: all .15s;
  white-space: nowrap;
}
.view-btn.active {
  background: var(--c-card);
  color: var(--c-text);
  box-shadow: 0 1px 3px rgba(0,0,0,.1);
}

/* ─── Compact list view ───────────────────────────────────────────────────── */
.pub-list {
  background: var(--c-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.pub-row {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 11px 18px;
  border-bottom: 1px solid var(--c-border);
  transition: background .12s;
}
.pub-row:last-child { border-bottom: none; }
.pub-row:hover { background: var(--c-hover); }

.pub-row-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.topic-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
}
.pub-row-year {
  font-size: .8rem;
  font-weight: 600;
  color: var(--c-muted);
  white-space: nowrap;
}
.pub-row-main { min-width: 0; }
.pub-row-title {
  font-size: .9rem;
  font-weight: 600;
  color: var(--c-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
}
.pub-row-meta {
  font-size: .78rem;
  color: var(--c-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.pub-row-meta em { font-style: italic; }
.pub-row-actions { display: flex; gap: 4px; flex-shrink: 0; }
.btn-link-xs {
  padding: 3px 10px;
  border: 1px solid var(--c-border);
  border-radius: 12px;
  font-size: .75rem;
  background: none;
  color: var(--c-blue);
  cursor: pointer;
  font-family: var(--font);
  text-decoration: none;
  display: inline-block;
  transition: all .12s;
  white-space: nowrap;
}
.btn-link-xs:hover {
  background: var(--c-blue);
  color: #fff;
  border-color: var(--c-blue);
  text-decoration: none;
}

/* ─── Topic group (By Topic) view ─────────────────────────────────────────── */
.topic-group {
  margin-bottom: 12px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  background: var(--c-card);
}
.topic-group-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  cursor: pointer;
  user-select: none;
  transition: background .15s;
  border-bottom: 1px solid var(--c-border);
}
.topic-group-header:hover { background: var(--c-hover); }
.topic-group-count {
  font-size: .82rem;
  color: var(--c-muted);
  margin-left: auto;
}
.topic-toggle-icon {
  color: var(--c-muted);
  font-size: .9rem;
  transition: transform .2s;
  flex-shrink: 0;
}
.topic-group.collapsed .topic-toggle-icon { transform: rotate(-90deg); }
.topic-group-body { padding: 12px 16px 16px; }
.topic-group.collapsed .topic-group-body { display: none; }
.topic-group.collapsed .topic-group-header { border-bottom: none; }
/* Slightly smaller cards inside topic groups */
.topic-group .pub-card {
  box-shadow: 0 1px 4px rgba(0,53,102,.07);
  margin-bottom: 10px;
}
.topic-group .pub-card:last-child { margin-bottom: 0; }

/* ─── Citation & IF badges ───────────────────────────────────────────────── */
.citation-badge {
  display: none;
  font-size: .72rem;
  font-weight: 600;
  color: #059669;
  background: #d1fae5;
  padding: 2px 8px;
  border-radius: 20px;
  white-space: nowrap;
  align-items: center;
  gap: 3px;
}
[data-theme="dark"] .citation-badge { background: #064e3b; color: #6ee7b7; }

.if-badge {
  display: inline-block;
  font-size: .72rem;
  font-weight: 600;
  color: #1d4ed8;
  background: #dbeafe;
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 4px;
  white-space: nowrap;
}
[data-theme="dark"] .if-badge { background: #1e3a5f; color: #93c5fd; }

/* ─── Clickable author names ──────────────────────────────────────────────── */
.author-link {
  cursor: pointer;
  border-radius: 3px;
  padding: 0 2px;
  transition: background .12s, color .12s;
}
.author-link:hover {
  background: var(--c-blue);
  color: #fff;
}
.author-link.filtering { background: #dbeafe; color: var(--c-navy); }

/* ─── Citation Modal ─────────────────────────────────────────────────────── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}
.modal-overlay.open { display: flex; }

.modal-box {
  background: var(--c-card);
  border-radius: var(--radius);
  width: min(560px, 92vw);
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,.4);
  padding: 28px;
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.modal-head h3 { font-size: 1.1rem; font-weight: 700; }

.btn-modal-close {
  background: none;
  border: none;
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  color: var(--c-muted);
  padding: 0 4px;
}
.btn-modal-close:hover { color: var(--c-text); }

.cite-tabs { display: flex; gap: 4px; margin-bottom: 16px; }

.cite-tab {
  padding: 6px 18px;
  border: 1px solid var(--c-border);
  border-radius: 6px;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  background: none;
  color: var(--c-muted);
  font-family: var(--font);
  transition: all .15s;
}
.cite-tab.active {
  background: var(--c-blue);
  color: #fff;
  border-color: var(--c-blue);
}

.cite-code {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: 6px;
  padding: 16px;
  font-size: .82rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: 'Courier New', monospace;
  color: var(--c-text);
  margin-bottom: 14px;
  max-height: 200px;
  overflow-y: auto;
}

.btn-copy {
  background: var(--c-blue);
  color: #fff;
  border: none;
  padding: 9px 22px;
  border-radius: 6px;
  font-size: .875rem;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font);
  transition: all .2s;
}
.btn-copy:hover { background: var(--c-navy); }
.btn-copy.copied { background: #10b981; }

/* ─── Topic Cards (homepage) ─────────────────────────────────────────────── */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 40px;
}

.topic-card {
  background: var(--c-card);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: var(--c-text);
  border-left: 5px solid #ccc;
  transition: box-shadow .2s, transform .2s;
  display: block;
}
.topic-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); text-decoration: none; color: var(--c-text); }

.topic-card-name { font-size: .9rem; font-weight: 600; margin-bottom: 4px; }
.topic-card-count { font-size: .8rem; color: var(--c-muted); }

/* ─── Page header ─────────────────────────────────────────────────────────── */
.page-header {
  background: var(--c-card);
  border-bottom: 1px solid var(--c-border);
  padding: 32px 0 24px;
  margin-bottom: 8px;
}

.page-header h1 { font-size: 1.75rem; font-weight: 700; margin-bottom: 6px; }
.page-header p { color: var(--c-muted); font-size: .95rem; }

/* ─── Footer ─────────────────────────────────────────────────────────────── */
footer {
  background: var(--c-navy);
  color: rgba(255,255,255,.65);
  text-align: center;
  padding: 28px 24px;
  margin-top: 60px;
  font-size: .875rem;
}
footer a { color: rgba(255,255,255,.75); }
footer a:hover { color: #fff; }

/* ─── Loading / empty states ──────────────────────────────────────────────── */
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--c-border);
  border-top-color: var(--c-blue);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  margin: 60px auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--c-muted);
}
.empty-state .emoji { font-size: 2.5rem; margin-bottom: 12px; }

/* ─── Toast ──────────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: #1e293b;
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: .875rem;
  font-weight: 500;
  z-index: 3000;
  opacity: 0;
  transform: translateY(10px);
  transition: all .25s;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateY(0); }

/* ─── Reading list page ──────────────────────────────────────────────────── */
.rl-empty {
  text-align: center;
  padding: 40px;
  color: var(--c-muted);
  font-size: .95rem;
}

/* ─── Responsive ─────────────────────────────────────────────────────────── */

/* Tablet: sidebar collapses to offcanvas */
@media (max-width: 900px) {
  .pub-layout { grid-template-columns: 1fr; }
  .pub-sidebar { display: none; }
  .btn-filters-mobile { display: block; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }

  .pub-sidebar.mobile-open {
    display: block;
    position: fixed;
    top: var(--nav-h);
    left: 0; bottom: 0;
    width: 280px;
    border-radius: 0;
    z-index: 900;
    overflow-y: auto;
  }
  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.4);
    z-index: 890;
  }
  .sidebar-overlay.open { display: block; }
}

/* Mobile: full overhaul */
@media (max-width: 600px) {
  /* Layout */
  .container-xl { padding: 0 14px; }

  /* Navbar — theme button stays visible, hamburger follows */
  .nav-links { display: none; }
  .btn-theme { margin-left: auto; margin-right: 4px; }
  .nav-hamburger { display: flex; margin-left: 0; }
  .nav-logo { height: 36px; }
  .nav-title-block .nav-sub { display: none; }

  /* Hero */
  .hero { padding: 44px 0 36px; }
  .hero-title { font-size: 1.65rem; }
  .hero-actions { flex-direction: column; gap: 10px; }
  .btn-hero-primary, .btn-hero-outline { text-align: center; width: 100%; box-sizing: border-box; }

  /* About section */
  .about-division { padding: 36px 0; }
  .about-pillars { grid-template-columns: 1fr 1fr; }
  .pillar { font-size: .78rem; padding: 8px 10px; }

  /* Stats */
  .stats-row { grid-template-columns: 1fr 1fr; }

  /* Publications toolbar — stack count above actions */
  .results-bar { flex-direction: column; align-items: flex-start; gap: 8px; }
  .results-actions { flex-wrap: wrap; gap: 6px; width: 100%; }
  .view-toggle { flex: 1 1 auto; }
  .view-btn { flex: 1; padding: 5px 6px; font-size: .75rem; }
  #exportCsv { display: none; }   /* Export not useful on mobile */

  /* List view rows — reflow to 2-line layout */
  .pub-row {
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    gap: 2px 10px;
    padding: 12px 14px;
  }
  .pub-row-main  { grid-column: 1; grid-row: 1; min-width: 0; }
  .pub-row-left  { grid-column: 1; grid-row: 2; }
  .pub-row-actions { grid-column: 2; grid-row: 1 / 3; align-self: center; }
  .pub-row-title { white-space: normal; font-size: .85rem; }
  .pub-row-meta  { white-space: normal; font-size: .75rem; }

  /* Cards — slightly tighter */
  .pub-card { padding: 16px 16px; }

  /* Topic groups */
  .topic-group-header { padding: 12px 14px; }
  .topic-group-body { padding: 10px 10px 12px; }

  /* Page header */
  .page-header { padding: 24px 0 16px; }
  .page-header h1 { font-size: 1.35rem; }

  /* Search hero */
  .search-hero { padding: 36px 0 28px; }
  .search-input { font-size: .9rem; padding: 12px 14px; }
  .search-btn { padding: 12px 16px; font-size: .85rem; }

  /* Topics grid — 2 per row */
  .topics-grid { grid-template-columns: 1fr 1fr; }

  /* Modal — full-width on mobile */
  .modal-box { padding: 20px 16px; }
  .cite-code { font-size: .75rem; }

  /* Toast */
  .toast { right: 12px; bottom: 16px; left: 12px; text-align: center; }
}

/* Very small screens (≤380px) */
@media (max-width: 380px) {
  .view-btn { font-size: .7rem; padding: 5px 4px; }
  .about-pillars { grid-template-columns: 1fr; }
  .topics-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
}