/* ─────────────────────────────────────────────
   GS-Diff Project Page  –  Custom Styles
   ───────────────────────────────────────────── */

/* ── Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Raleway:wght@400;600;700&family=Source+Sans+3:wght@300;400;600&display=swap');

:root {
  --primary:   #6366f1;
  --primary-dark: #4f46e5;
  --dark-hero: #0f172a;
  --accent:    #06b6d4;
  --accent-warm: #f59e0b;
  --light-bg:  #f8fafc;
  --border:    #e2e8f0;
  --text:      #1e293b;
  --card-bg:   #ffffff;
}

body {
  font-family: 'Source Sans 3', sans-serif;
  color: var(--text);
}

/* ── Navbar ── */
.navbar {
  box-shadow: 0 2px 8px rgba(0,0,0,.08);
}
.navbar-brand .navbar-item {
  font-family: 'Raleway', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: .03em;
  color: var(--primary);
}
.navbar-item {
  font-weight: 600;
  font-size: .9rem;
}

/* ── Hero ── */
.hero.is-dark {
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
  min-height: auto;
  padding-top: 4rem !important;
}
.hero-body {
  padding: 2.5rem 1.5rem 3rem !important;
}
.hero .title {
  font-family: 'Raleway', sans-serif;
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}
.hero .subtitle {
  color: rgba(255,255,255,.85);
  font-size: 1rem;
}
.author-block {
  display: inline;
}
.author-block a {
  color: #93c5fd;
  text-decoration: none;
  font-weight: 600;
}
.author-block a:hover { text-decoration: underline; }

.publication-authors {
  margin-bottom: .75rem;
}
.publication-venue {
  font-size: .95rem;
  color: rgba(255,255,255,.75);
  margin-bottom: 1.5rem;
}

/* link buttons */
.publication-links .button {
  margin: .25rem;
  font-weight: 600;
  border-radius: 6px;
}
.publication-links .button.is-rounded {
  padding-left: 1.1em;
  padding-right: 1.1em;
}
.link-block a { color: inherit; }

/* ── Section titles ── */
.section-title {
  font-family: 'Raleway', sans-serif;
  font-weight: 700;
  font-size: 1.85rem;
  color: var(--primary-dark);
  margin-bottom: .5rem;
  text-align: center;
}
.section-divider {
  height: 4px;
  width: 70px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  margin: .5rem auto 1rem;
}

/* ── Alternating section backgrounds ── */
.section.is-light-alt { background: var(--light-bg); }

/* ── Abstract ── */
#abstract p {
  font-size: 1rem;
  line-height: 1.45;
  text-align: center;
  margin-bottom: 0.5rem;
}
#abstract br {
  display: none;
}

/* ── Highlights cards ── */
.highlight-card {
  background: linear-gradient(145deg, #ffffff, #f8fafc);
  border: none;
  border-radius: 16px;
  padding: 1.75rem 1.25rem;
  height: 100%;
  text-align: center;
  transition: all .3s ease;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
}
.highlight-card:hover {
  box-shadow: 0 20px 25px -5px rgba(99,102,241,0.15), 0 10px 10px -5px rgba(99,102,241,0.1);
  transform: translateY(-5px);
}
.highlight-card .icon-wrap {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto .85rem;
  color: #fff;
  font-size: 1.5rem;
  box-shadow: 0 10px 15px -3px rgba(99,102,241,0.3);
}
.highlight-card h3 {
  font-family: 'Raleway', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: .4rem;
  color: var(--text);
}
.highlight-card p {
  font-size: .9rem;
  color: #6b7280;
  line-height: 1.5;
  text-align: center;
}
.stat-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--accent-warm) 0%, #f97316 100%);
  color: #fff;
  font-family: 'Raleway', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  padding: .35em .85em;
  border-radius: 25px;
  margin-bottom: .5rem;
  box-shadow: 0 4px 6px -1px rgba(245,158,11,0.3);
}

/* ── Method section content ── */
#method .content p {
  text-align: center;
}

/* ── Video Tabs ── */
.video-tab-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .5rem;
  margin-bottom: 1.25rem;
}
.video-tab-btn {
  padding: .45em 1.2em;
  border: 2px solid var(--primary);
  border-radius: 25px;
  background: transparent;
  color: var(--primary);
  font-family: 'Raleway', sans-serif;
  font-weight: 600;
  font-size: .9rem;
  cursor: pointer;
  transition: background .18s, color .18s;
}
.video-tab-btn.active,
.video-tab-btn:hover {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  box-shadow: 0 4px 12px rgba(99,102,241,0.3);
}
.video-panel { display: none; }
.video-panel.active { display: block; }
.video-panel video {
  width: 100%;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0,0,0,.15);
}
.video-caption {
  font-size: .9rem;
  color: #6b7280;
  margin-top: .6rem;
  text-align: center;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* ── Figures ── */
.figure-wrap {
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 16px rgba(0,0,0,.08);
}
.figure-wrap img { display: block; width: 100%; }
.figure-caption {
  font-size: .9rem;
  color: #555;
  margin-top: .75rem;
  line-height: 1.55;
  text-align: center;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

/* ── Results Tables ── */
.table-container {
  display: flex;
  justify-content: center;
}
.results-table {
  width: auto;
  min-width: 600px;
  max-width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
  margin: 0 auto;
}
.results-table th {
  background: #374151;
  color: #fff;
  font-family: 'Raleway', sans-serif;
  font-weight: 700;
  padding: .7rem 1rem;
  text-align: center;
  white-space: nowrap;
  border-bottom: 2px solid #4b5563;
}
table.results-table td,
.results-table tbody td,
.results-table tr td {
  padding: .55rem 1rem;
  text-align: center;
  border-bottom: 1px solid #e2e8f0;
  vertical-align: middle;
}
.results-table tr:last-child td { border-bottom: none; }
.results-table tr:nth-child(even) td { background: #f8fafc; }
.results-table .ours td {
  font-weight: 700;
  background: #e2e8f0 !important;
  color: #0f172a;
}
.results-table .ours td:first-child {
  color: var(--primary-dark);
  font-weight: 800;
}
.results-table .midrule td {
  border-top: 2px solid #94a3b8;
}
.results-table td.bold { font-weight: 800; background: #cbd5e1; color: #0f172a; }
.results-table td.second { text-decoration: underline; text-decoration-color: #94a3b8; }
.check { color: #16a34a; }
.cross  { color: #dc2626; }

/* ── BibTeX ── */
#bibtex pre {
  background: #1e293b;
  color: #e2e8f0;
  border-radius: 10px;
  padding: 1.5rem;
  font-size: .88rem;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
  position: relative;
}
.copy-btn {
  position: absolute;
  top: .7rem;
  right: .7rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: .25em .7em;
  font-size: .8rem;
  cursor: pointer;
  font-weight: 600;
}
.copy-btn:hover { background: var(--primary); }

/* ── Footer ── */
footer.footer {
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
  color: rgba(255,255,255,.7);
  font-size: .9rem;
  padding: 2.5rem 1.5rem;
  text-align: center;
}
footer a { color: var(--accent); }

/* ── Responsive tweaks ── */
@media (max-width: 768px) {
  .hero .title { font-size: 1.35rem; }
  .section-title { font-size: 1.35rem; }
  .results-table { font-size: .78rem; }
  .results-table th, .results-table td { padding: .4rem .4rem; }
}