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

:root {
  --clr-bg:      #ffffff;
  --clr-surface: #f5f7fa;
  --clr-text:    #1d1d1f;
  --clr-secondary: #6e6e73;
  --clr-accent:  #1668b3;
  --clr-accent-light: #e9f1f9;
  --clr-accent-hover: #114e8a;
  --clr-border:  #e5e5ea;
  --max-w:       820px;
  --font-body:   'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono:   'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--clr-text);
  background: var(--clr-bg);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Layout ──────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 56px 0;
}

section + section {
  border-top: 1px solid var(--clr-border);
}

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 80px 0 48px;
  border-bottom: 1px solid var(--clr-border);
}

.conference-badge {
  display: inline-block;
  margin-bottom: 28px;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.conference-badge:hover { opacity: 0.75; }

.conference-badge img {
  height: 52px;
  width: auto;
}

.hero .container {
  max-width: 960px;
}

.hero h1 {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.025em;
  color: var(--clr-text);
}

.authors {
  font-size: 1.05rem;
  color: var(--clr-text);
  margin-bottom: 8px;
  font-weight: 400;
}

.authors strong {
  font-weight: 500;
}

.author-link {
  color: var(--clr-text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.author-link:hover {
  border-bottom-color: var(--clr-accent);
  color: var(--clr-accent);
}

.affiliation {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--clr-secondary);
  margin-bottom: 36px;
}

.affiliation img {
  height: 22px;
  width: auto;
  opacity: 0.85;
  position: relative;
  top: 1px;
}

/* ── Link buttons ────────────────────────────────────────── */
.links {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 20px;
  font-size: 0.88rem;
  font-weight: 500;
  border-radius: 10px;
  text-decoration: none;
  transition: all 0.2s ease;
  border: 1.5px solid var(--clr-border);
  color: var(--clr-text);
  background: var(--clr-bg);
  cursor: pointer;
}

.btn:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  background: var(--clr-accent-light);
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.btn--primary {
  background: var(--clr-accent);
  color: #fff;
  border-color: var(--clr-accent);
}

.btn--primary:hover {
  background: var(--clr-accent-hover);
  border-color: var(--clr-accent-hover);
  color: #fff;
}

.btn--disabled {
  opacity: 0.55;
  cursor: default;
  pointer-events: none;
}

/* ── Section headings ────────────────────────────────────── */
.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: -0.015em;
  color: var(--clr-text);
}

.section-subtitle {
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 14px;
  color: var(--clr-text);
}

/* ── Text blocks ─────────────────────────────────────────── */
.text-block p {
  color: var(--clr-secondary);
  margin-bottom: 14px;
  line-height: 1.75;
}

.text-block p:last-child { margin-bottom: 0; }

.text-block strong {
  color: var(--clr-text);
  font-weight: 600;
}

/* ── TL;DR callout ───────────────────────────────────────── */
.tldr {
  background: var(--clr-accent-light);
  border-left: 3px solid var(--clr-accent);
  border-radius: 0 8px 8px 0;
  padding: 16px 20px;
  margin-bottom: 28px;
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--clr-text);
}

.tldr strong {
  color: var(--clr-accent);
  font-weight: 700;
}

/* ── Contributions ───────────────────────────────────────── */
.contributions-list {
  list-style: none;
  counter-reset: contrib;
}

.contributions-list li {
  position: relative;
  padding-left: 38px;
  margin-bottom: 16px;
  line-height: 1.65;
  color: var(--clr-secondary);
}

.contributions-list li::before {
  counter-increment: contrib;
  content: counter(contrib);
  position: absolute;
  left: 0;
  top: 1px;
  width: 24px;
  height: 24px;
  background: var(--clr-accent);
  color: #fff;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contributions-list li strong {
  color: var(--clr-text);
  font-weight: 600;
}

/* ── Figures ──────────────────────────────────────────────── */
.figure {
  margin: 32px 0;
}

.figure img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--clr-border);
}

.figure--compact img {
  max-width: 520px;
  display: block;
  margin: 0 auto;
}

.figure figcaption {
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--clr-secondary);
  line-height: 1.55;
  text-align: center;
}

.figure figcaption strong {
  color: var(--clr-text);
  font-weight: 600;
}

/* ── Results ─────────────────────────────────────────────── */
.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 28px 0;
}

.stat-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 12px;
  padding: 28px 16px;
  text-align: center;
  transition: border-color 0.2s ease;
}

.stat-card:hover {
  border-color: var(--clr-accent);
}

.stat-card .value {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--clr-accent);
  line-height: 1;
  letter-spacing: -0.03em;
}

.stat-card .unit {
  font-size: 1rem;
  font-weight: 500;
}

.stat-card .desc {
  font-size: 0.8rem;
  color: var(--clr-secondary);
  margin-top: 8px;
  line-height: 1.4;
}

/* ── Results table ───────────────────────────────────────── */
.table-wrapper {
  margin: 28px 0;
  overflow-x: auto;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  line-height: 1.5;
}

.results-table th {
  background: var(--clr-accent);
  color: #fff;
  font-weight: 600;
  padding: 10px 10px;
  text-align: center;
  white-space: nowrap;
}

.results-table th:first-child {
  text-align: left;
  border-radius: 8px 0 0 0;
}

.results-table th:last-child {
  border-radius: 0 8px 0 0;
}

.results-table td {
  padding: 9px 10px;
  text-align: center;
  border-bottom: 1px solid var(--clr-border);
  color: var(--clr-secondary);
}

.results-table td:first-child {
  text-align: left;
  color: var(--clr-text);
  font-weight: 500;
}

.results-table td.check {
  color: var(--clr-accent);
  font-size: 1.1rem;
}

.results-table td:last-child {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  white-space: nowrap;
}

.results-table .row-fusion {
  background: #edf3f8;
}

.results-table .row-reg {
  background: #d8e5f0;
}

.results-table .row-ours td {
  color: var(--clr-text);
}

.results-table tbody tr:hover {
  background: #c2d6e6;
}

/* ── Video ───────────────────────────────────────────────── */
.video-wrapper {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--clr-border);
  background: #000;
}

.video-wrapper video {
  display: block;
  width: 100%;
  height: auto;
}

/* ── BibTeX ──────────────────────────────────────────────── */
.bibtex-wrapper {
  position: relative;
}

.bibtex-block {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 10px;
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.7;
  overflow-x: auto;
  white-space: pre;
  color: var(--clr-text);
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: 6px;
  padding: 5px 14px;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--clr-secondary);
  transition: all 0.2s ease;
  font-family: var(--font-body);
}

.copy-btn:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
}

/* ── Footer ──────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 40px 0;
  font-size: 0.8rem;
  color: var(--clr-secondary);
  border-top: 1px solid var(--clr-border);
}

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

footer a:hover { text-decoration: underline; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 700px) {
  .hero { padding: 52px 0 36px; }
  .hero h1 { font-size: 1.45rem; }
  .authors { font-size: 0.95rem; }
  .results-grid { grid-template-columns: 1fr; gap: 10px; }
  .stat-card { padding: 20px 16px; }
  .stat-card .value { font-size: 1.8rem; }
  .links { gap: 8px; }
  .btn { padding: 9px 14px; font-size: 0.82rem; }
  section { padding: 40px 0; }
  .bibtex-block { font-size: 0.7rem; padding: 14px 16px; }
  .figure--compact img { max-width: 100%; }
}