/* ═══════════════════════════════════════════════
   SVFSearch — GitHub Pages Stylesheet
   ═══════════════════════════════════════════════ */

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

:root {
  --accent:    #5b4fcf;
  --accent2:   #7c3aed;
  --accent-lt: #ede9fe;
  --gray-50:   #f9fafb;
  --gray-100:  #f3f4f6;
  --gray-200:  #e5e7eb;
  --gray-400:  #9ca3af;
  --gray-600:  #4b5563;
  --gray-800:  #1f2937;
  --gray-900:  #111827;
  --white:     #ffffff;

  --font:      'Inter', system-ui, sans-serif;
  --mono:      'JetBrains Mono', 'Fira Code', monospace;

  --radius:    10px;
  --shadow:    0 1px 3px rgba(0,0,0,.08), 0 4px 12px rgba(0,0,0,.06);
  --shadow-lg: 0 4px 24px rgba(0,0,0,.12);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--gray-800);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

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

/* ─── Layout Helpers ────────────────────────── */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.container.narrow {
  max-width: 780px;
}

.section {
  padding: 5rem 0;
}
.section-white { background: var(--white); }
.section-gray  { background: var(--gray-50); }
.section-accent {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
}

/* ─── Hero ──────────────────────────────────── */
.hero {
  position: relative;
  padding: 5rem 0 4.5rem;
  background: linear-gradient(160deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(91,79,207,.35) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 80% 20%, rgba(124,58,237,.3) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.venue-badge {
  display: inline-block;
  padding: .35rem 1rem;
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 99px;
  color: rgba(255,255,255,.8);
  font-size: .8rem;
  letter-spacing: .05em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 700;
  color: #fff;
  letter-spacing: -.02em;
  line-height: 1.05;
  background: linear-gradient(120deg, #fff 30%, #c4b5fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: rgba(255,255,255,.75);
  margin: 1rem 0 1.5rem;
  line-height: 1.5;
}

.hero-paper-title {
  font-size: clamp(.9rem, 2.2vw, 1.15rem);
  color: rgba(255,255,255,.7);
  margin: .9rem 0 1.5rem;
  line-height: 1.55;
  font-style: italic;
  max-width: 700px;
}

.author-list {
  color: rgba(255,255,255,.6);
  font-size: .95rem;
  margin-bottom: 2rem;
}

/* ─── Buttons ───────────────────────────────── */
.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .65rem 1.4rem;
  border-radius: var(--radius);
  font-size: .92rem;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: all .18s ease;
  text-decoration: none;
}
.btn svg { width: 1em; height: 1em; flex-shrink: 0; }

.btn-primary {
  background: rgba(124,58,237,.28);
  color: #e0d9ff;
  border: 1.5px solid rgba(167,139,250,.45);
  backdrop-filter: blur(6px);
}
.btn-primary:hover { background: rgba(124,58,237,.42); border-color: rgba(167,139,250,.7); text-decoration: none; color: #fff; }

.btn-secondary {
  background: rgba(124,58,237,.13);
  color: rgba(196,181,253,.9);
  border: 1.5px solid rgba(167,139,250,.28);
  backdrop-filter: blur(6px);
}
.btn-secondary:hover { background: rgba(124,58,237,.24); border-color: rgba(167,139,250,.5); text-decoration: none; color: #e0d9ff; }

.btn-outline {
  background: rgba(124,58,237,.05);
  color: rgba(196,181,253,.7);
  border: 1.5px solid rgba(167,139,250,.18);
  backdrop-filter: blur(4px);
}
.btn-outline:hover { background: rgba(124,58,237,.15); border-color: rgba(167,139,250,.38); text-decoration: none; color: rgba(224,217,255,.9); }

.btn-white {
  background: #fff;
  color: var(--accent);
  border: none;
  font-weight: 600;
}

.btn-arxiv {
  background: rgba(124,58,237,.45);
  color: #fff;
  border: 1.5px solid rgba(167,139,250,.7);
  backdrop-filter: blur(6px);
  font-weight: 600;
}
.btn-arxiv:hover { background: rgba(124,58,237,.65); border-color: rgba(167,139,250,.95); text-decoration: none; color: #fff; }

/* ─── Citation Box ──────────────────────────── */
.citation-box {
  position: relative;
  background: var(--gray-900);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  margin-top: 1.25rem;
  overflow: hidden;
}

.citation-code {
  font-family: var(--mono);
  font-size: .82rem;
  color: #e5e7eb;
  line-height: 1.7;
  white-space: pre;
  overflow-x: auto;
  margin: 0;
}

.citation-copy-btn {
  position: absolute;
  top: .85rem;
  right: .85rem;
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .35rem .85rem;
  background: rgba(255,255,255,.1);
  color: rgba(255,255,255,.75);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 6px;
  font-size: .78rem;
  font-family: var(--font);
  cursor: pointer;
  transition: background .15s ease, color .15s ease;
}
.citation-copy-btn svg { width: .9em; height: .9em; }
.citation-copy-btn:hover { background: rgba(255,255,255,.2); color: #fff; }
.citation-copy-btn.copied { background: #16a34a; border-color: #16a34a; color: #fff; }
.btn-white:hover { background: var(--accent-lt); text-decoration: none; }

/* ─── Section headings ──────────────────────── */
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 700;
  color: var(--gray-900);
  text-align: center;
  margin-bottom: 1rem;
  letter-spacing: -.02em;
}
.section-desc {
  text-align: center;
  color: var(--gray-600);
  font-size: 1.02rem;
  margin-bottom: 2.5rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}
.subsection-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--gray-800);
  margin: 2.5rem 0 1rem;
  text-align: center;
}

/* ─── Abstract ──────────────────────────────── */
.abstract-text {
  font-size: 1.02rem;
  color: var(--gray-700, #374151);
  line-height: 1.8;
  margin-bottom: 1rem;
}

/* ─── Stats Grid ────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

.stat-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.5rem 1.25rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform .15s, box-shadow .15s;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

.stat-number {
  display: block;
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -.02em;
  line-height: 1;
}
.stat-label {
  display: block;
  font-weight: 600;
  font-size: .9rem;
  color: var(--gray-800);
  margin: .4rem 0 .2rem;
}
.stat-sub {
  display: block;
  font-size: .8rem;
  color: var(--gray-400);
}

/* ─── Figures ───────────────────────────────── */
.fig-full { margin: 1.5rem 0 0; }

.fig-img {
  display: block;
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
  background: var(--white);
}

/* contained: cap height so it doesn't stretch excessively */
.fig-img-contained {
  max-height: 520px;
  object-fit: contain;
  margin: 0 auto;
}

.fig-caption {
  margin-top: .75rem;
  font-size: .875rem;
  color: var(--gray-600);
  line-height: 1.5;
  text-align: center;
}

/* ─── Case Images ───────────────────────────── */
.case-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}
.case-card {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
}
.case-card img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
}
.case-label {
  font-size: .78rem;
  text-align: center;
  padding: .45rem .5rem;
  color: var(--gray-600);
  background: var(--white);
}

/* ─── Dataset two-col ───────────────────────── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}
.col-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 1.25rem;
}

.pipeline-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.pipeline-list li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.step-num {
  flex-shrink: 0;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: .78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: .1rem;
}
.pipeline-list strong { display: block; font-weight: 600; margin-bottom: .25rem; }
.pipeline-list p { font-size: .92rem; color: var(--gray-600); }

/* ─── Retrieval cards ───────────────────────── */
.retrieval-cards {
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.retrieval-item {
  display: flex;
  align-items: center;
  gap: .85rem;
  padding: .85rem 1rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.ri-icon {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: .85rem;
  flex-shrink: 0;
}
.ri-text  { background: #dbeafe; color: #1d4ed8; }
.ri-bm25  { background: #dcfce7; color: #15803d; }
.ri-img   { background: #fce7f3; color: #be185d; }
.ri-mm    { background: #ede9fe; color: #6d28d9; }

.retrieval-item strong { display: block; font-weight: 600; font-size: .9rem; }
.retrieval-item p { font-size: .8rem; color: var(--gray-600); }

/* ─── Tags ──────────────────────────────────── */
.tag-row { display: flex; flex-wrap: wrap; gap: .5rem; }
.tag-row-centered { justify-content: center; }
.tag {
  padding: .3rem .75rem;
  border-radius: 99px;
  font-size: .78rem;
  font-weight: 500;
  transition: transform .15s, box-shadow .15s;
  cursor: default;
}
.tag:hover { transform: translateY(-1px); box-shadow: 0 2px 8px rgba(0,0,0,.1); }
.tag-char  { background:#dbeafe; color:#1d4ed8; }
.tag-equip { background:#dcfce7; color:#15803d; }
.tag-map   { background:#fef3c7; color:#92400e; }
.tag-story { background:#fce7f3; color:#be185d; }
.tag-mech  { background:#ede9fe; color:#6d28d9; }
.tag-other { background:#f3f4f6; color:#4b5563; }
.tag-easy  { background:#d1fae5; color:#065f46; }
.tag-med   { background:#fef3c7; color:#92400e; }
.tag-hard  { background:#fee2e2; color:#991b1b; }

/* ─── Question Categories (full-width) ─────── */
.categories-full {
  margin-top: 2.5rem;
  padding: 1.75rem 2rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.categories-full-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gray-900);
  text-align: center;
  margin-bottom: 1.25rem;
}
.categories-tags-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}
.cat-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .75rem;
}
.cat-group-label {
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--gray-400);
}
.cat-divider {
  width: 1px;
  height: 3.5rem;
  background: var(--gray-200);
  flex-shrink: 0;
}
@media (max-width: 600px) {
  .cat-divider { width: 80%; height: 1px; }
  .categories-full { padding: 1.25rem 1rem; }
}

/* ─── Protocol Cards ────────────────────────── */
.protocol-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.25rem;
  margin-top: 1rem;
}
.protocol-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow);
  transition: transform .15s, box-shadow .15s;
}
.protocol-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.proto-icon { font-size: 1.8rem; margin-bottom: .75rem; }
.protocol-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: .6rem; }
.protocol-card p  { font-size: .875rem; color: var(--gray-600); line-height: 1.6; }

/* ─── Milestone Cards ───────────────────────── */
.milestone-cards {
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 780px;
  margin: 0 auto 3rem;
  flex-wrap: wrap;
  gap: 0;
}
.milestone-card {
  flex: 1;
  min-width: 160px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  padding: 1.5rem 1.25rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s;
  position: relative;
}
.milestone-card:first-of-type { border-radius: var(--radius) 0 0 var(--radius); }
.milestone-card:last-of-type  { border-radius: 0 var(--radius) var(--radius) 0; }
.milestone-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); z-index: 1; }
.milestone-direct { border-top: 4px solid #3b82f6; }
.milestone-agent  { border-top: 4px solid #7c3aed; }
.milestone-oracle { border-top: 4px solid #f59e0b; }

.milestone-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 .6rem;
  gap: .3rem;
  flex-shrink: 0;
}
.mc-arrow {
  font-size: 1.3rem;
  color: var(--gray-300);
  line-height: 1;
}
.mc-gain {
  font-size: .68rem;
  font-weight: 700;
  color: #065f46;
  background: #d1fae5;
  padding: .15rem .45rem;
  border-radius: 99px;
  white-space: nowrap;
}

.milestone-label {
  display: block;
  font-size: .68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--gray-400);
  margin-bottom: .6rem;
}
.milestone-score {
  display: block;
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1;
  margin-bottom: .5rem;
}
.milestone-direct .milestone-score { color: #3b82f6; }
.milestone-agent  .milestone-score { color: #7c3aed; }
.milestone-oracle .milestone-score { color: #f59e0b; }
.milestone-model {
  display: block;
  font-size: .75rem;
  color: var(--gray-400);
}

@media (max-width: 700px) {
  .milestone-cards { flex-direction: column; gap: .75rem; }
  .milestone-card { border-radius: var(--radius) !important; width: 100%; }
  .milestone-connector { flex-direction: row; }
  .mc-arrow { transform: rotate(90deg); }
}

/* ─── Oracle Row Glow ───────────────────────── */
@keyframes oracle-glow {
  0%, 100% { background-color: transparent; }
  50%       { background-color: rgba(16, 185, 129, 0.06); }
}
.oracle-best {
  animation: oracle-glow 2.5s ease-in-out infinite;
}

/* ─── Performance Bars ──────────────────────── */
.perf-bars {
  max-width: 780px;
  margin: 0 auto 3rem;
  display: flex;
  flex-direction: column;
  gap: .85rem;
}
.perf-row {
  display: grid;
  grid-template-columns: 240px 1fr;
  align-items: center;
  gap: 1rem;
}
.perf-model {
  font-size: .9rem;
  font-weight: 500;
  text-align: right;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: .4rem;
  flex-wrap: wrap;
}
.perf-tag {
  font-size: .7rem;
  font-weight: 400;
  padding: .2rem .5rem;
  border-radius: 99px;
  background: var(--gray-100);
  color: var(--gray-600);
}
.perf-tag-par    { background: #ede9fe; color: #6d28d9; }
.perf-tag-oracle { background: #d1fae5; color: #065f46; }

.perf-bar-wrap {
  height: 34px;
  background: var(--gray-100);
  border-radius: 6px;
  overflow: hidden;
}
.perf-bar {
  height: 100%;
  border-radius: 6px;
  display: flex;
  align-items: center;
  padding-right: .6rem;
  justify-content: flex-end;
  font-size: .8rem;
  font-weight: 600;
  color: #fff;
  transition: width .5s ease;
}
.perf-direct  { background: linear-gradient(90deg, #60a5fa, #3b82f6); }
.perf-workflow { background: linear-gradient(90deg, #34d399, #10b981); }
.perf-par     { background: linear-gradient(90deg, #a78bfa, #7c3aed); }
.perf-oracle  { background: linear-gradient(90deg, #fbbf24, #f59e0b); }

/* ─── Results Table ─────────────────────────── */
.table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow);
}
.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .82rem;
  white-space: nowrap;
}
.results-table thead th {
  background: var(--gray-900);
  color: #fff;
  padding: .65rem .85rem;
  text-align: center;
  font-weight: 600;
  font-size: .78rem;
  letter-spacing: .03em;
}
.results-table thead th:first-child,
.results-table thead th:nth-child(2) {
  text-align: left;
}
.results-table tbody td {
  padding: .5rem .85rem;
  border-bottom: 1px solid var(--gray-100);
  text-align: center;
}
.results-table tbody td:first-child,
.results-table tbody td:nth-child(2) {
  text-align: left;
}
.results-table tbody tr:hover { background: var(--gray-50); }
.section-header td {
  background: var(--gray-100);
  font-weight: 600;
  font-size: .78rem;
  color: var(--gray-600);
  letter-spacing: .04em;
  text-transform: uppercase;
  text-align: left !important;
  padding: .45rem .85rem;
}
.oracle-header td { background: #d1fae5; color: #065f46; }
.best-row td:nth-child(3) {
  font-weight: 700;
  color: var(--accent);
}
.oracle-best td:nth-child(3) {
  font-weight: 700;
  color: #065f46;
}

/* ─── Findings ──────────────────────────────── */
.findings-box {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.75rem 2rem;
  margin-top: 2.5rem;
  box-shadow: var(--shadow);
}
.findings-box h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--accent);
}
.findings-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.findings-list li {
  padding-left: 1.25rem;
  position: relative;
  font-size: .95rem;
  color: var(--gray-700, #374151);
}
.findings-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* ─── Code Cards ────────────────────────────── */
.code-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}
.code-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.code-header {
  background: var(--gray-900);
  padding: .6rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.code-file {
  font-family: var(--mono);
  font-size: .8rem;
  color: #e5e7eb;
}
.code-badge {
  font-size: .7rem;
  padding: .2rem .55rem;
  border-radius: 99px;
  background: rgba(255,255,255,.12);
  color: rgba(255,255,255,.75);
}
.code-badge-workflow { background: rgba(52,211,153,.2); color: #6ee7b7; }
.code-badge-par      { background: rgba(167,139,250,.2); color: #c4b5fd; }

.code-block {
  margin: 0;
  padding: 1rem 1.1rem;
  background: #1e1e2e;
  font-family: var(--mono);
  font-size: .8rem;
  color: #cdd6f4;
  overflow-x: auto;
}
.code-card > p {
  padding: 1rem 1.1rem;
  font-size: .875rem;
  color: var(--gray-600);
  line-height: 1.6;
}

/* ─── Retrieval Services ────────────────────── */
.retrieval-services {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: .75rem;
  margin-top: 1rem;
}
.service-item {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  font-size: .85rem;
  color: var(--gray-700, #374151);
}
.service-item code {
  font-family: var(--mono);
  font-size: .75rem;
  color: var(--gray-600);
}
.port {
  font-family: var(--mono);
  font-size: .75rem;
  font-weight: 700;
  color: var(--accent);
}

/* ─── Dataset download section ──────────────── */
.dataset-cards {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}
.ds-card {
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: var(--radius);
  padding: 1.25rem 2rem;
  text-align: center;
  backdrop-filter: blur(4px);
}
.ds-num {
  display: block;
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -.02em;
}
.ds-label {
  display: block;
  font-size: .8rem;
  color: rgba(255,255,255,.7);
  margin-top: .25rem;
}

/* ─── BibTeX ────────────────────────────────── */
.bibtex-block {
  background: var(--gray-900);
  color: #cdd6f4;
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  font-family: var(--mono);
  font-size: .82rem;
  line-height: 1.75;
  overflow-x: auto;
  margin-top: 1.25rem;
  box-shadow: var(--shadow-lg);
}

/* ─── Footer ────────────────────────────────── */
.footer {
  background: var(--gray-900);
  padding: 2rem 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--gray-400);
  font-size: .875rem;
}
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { color: var(--gray-400); }
.footer-links a:hover { color: #fff; text-decoration: none; }

/* ─── Scroll Progress Bar ───────────────────── */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent2), #c4b5fd);
  z-index: 9999;
  transition: width .08s linear;
  box-shadow: 0 0 10px rgba(91,79,207,.5);
}

/* ─── Hero animated orbs ────────────────────── */
.hero-orb {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(72px);
}
.orb-1 {
  width: 340px; height: 340px;
  background: rgba(91,79,207,.45);
  top: -70px; left: 7%;
  animation: orb-float-a 9s ease-in-out infinite alternate;
}
.orb-2 {
  width: 230px; height: 230px;
  background: rgba(124,58,237,.38);
  bottom: -40px; right: 10%;
  animation: orb-float-b 11s ease-in-out infinite alternate;
}
.orb-3 {
  width: 170px; height: 170px;
  background: rgba(196,181,253,.2);
  top: 38%; left: 52%;
  transform: translateX(-50%);
  animation: orb-float-c 14s ease-in-out infinite alternate;
}
@keyframes orb-float-a {
  from { transform: translate(0,0) scale(1); }
  to   { transform: translate(45px,32px) scale(1.14); }
}
@keyframes orb-float-b {
  from { transform: translate(0,0) scale(1); }
  to   { transform: translate(-38px,-28px) scale(1.12); }
}
@keyframes orb-float-c {
  from { transform: translateX(-50%) translateY(0) scale(1); }
  to   { transform: translateX(-50%) translateY(22px) scale(0.87); }
}

/* ─── Hero content entrance ─────────────────── */
@keyframes hero-fade-up {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero-title    { animation: hero-fade-up .85s cubic-bezier(.22,1,.36,1) both; }
.hero-subtitle { animation: hero-fade-up .75s cubic-bezier(.22,1,.36,1) .2s both; }
.author-list   { animation: hero-fade-up .65s cubic-bezier(.22,1,.36,1) .38s both; }
.button-group  { animation: hero-fade-up .65s cubic-bezier(.22,1,.36,1) .54s both; }

/* ─── Section title underline sweep ─────────── */
.section-title::after {
  content: '';
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 99px;
  width: 0;
  margin: .55rem auto 0;
  transition: width .65s cubic-bezier(.22,1,.36,1);
}
.section-title.title-visible::after { width: 54px; }

/* ─── Figure image hover ─────────────────────── */
.fig-img {
  transition: transform .4s ease, box-shadow .4s ease;
}
.fig-img:hover {
  transform: scale(1.012);
  box-shadow: var(--shadow-lg);
  cursor: zoom-in;
}

/* ─── Retrieval item hover accent ───────────── */
.retrieval-item {
  transition: transform .2s ease, box-shadow .2s ease;
}
.retrieval-item:hover {
  transform: translateX(5px);
  box-shadow: inset 3px 0 0 var(--accent), var(--shadow-lg);
}

/* ─── Protocol card icon bounce ─────────────── */
.protocol-card:hover .proto-icon {
  display: inline-block;
  animation: icon-bounce .4s cubic-bezier(.36,1.56,.64,1);
}
@keyframes icon-bounce {
  0%   { transform: scale(1) translateY(0); }
  45%  { transform: scale(1.3) translateY(-6px); }
  100% { transform: scale(1) translateY(0); }
}

/* ─── Responsive ────────────────────────────── */
@media (max-width: 900px) {
  .two-col    { grid-template-columns: 1fr; gap: 2rem; }
  .case-grid  { grid-template-columns: 1fr 1fr; }
  .perf-row   { grid-template-columns: 1fr; }
  .perf-model { justify-content: flex-start; text-align: left; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .section      { padding: 3rem 0; }
  .stats-grid   { grid-template-columns: 1fr 1fr; }
  .case-grid    { grid-template-columns: 1fr 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
}