/* GGT-100K — PolyU VCLab theme (layout inspired by academic project pages) */
:root {
  --polyu-red: #8f1329;
  --polyu-red-dark: #6e0e20;
  --text: #1a1a1a;
  --text-muted: #5c5c5c;
  --bg: #fafafa;
  --card-bg: #ffffff;
  --border: #e8e8e8;
  --max-width: 920px;
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-serif: "Source Serif 4", Georgia, serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 1.25rem;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

a {
  color: var(--polyu-red);
  text-decoration: none;
}
a:hover { color: var(--polyu-red-dark); text-decoration: underline; }

img { max-width: 100%; height: auto; display: block; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ----- Header ----- */
.site-header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 0.65rem 0;
}

.header-inner { display: flex; justify-content: center; }

.logos { display: flex; align-items: center; gap: 1rem; }
.logos img { height: 2rem; width: auto; }

/* ----- Float nav ----- */
.float-nav {
  position: fixed;
  top: 50%;
  right: 0.85rem;
  transform: translateY(-50%);
  z-index: 100;
  width: 10.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  padding: 0.5rem 0;
}

.float-nav a {
  display: block;
  padding: 0.35rem 0.8rem;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  border-left: 3px solid transparent;
}

.float-nav a:hover {
  color: var(--polyu-red);
  background: rgba(143, 19, 41, 0.04);
  text-decoration: none;
}

.float-nav a.active {
  color: var(--polyu-red);
  border-left-color: var(--polyu-red);
  background: rgba(143, 19, 41, 0.06);
  font-weight: 600;
}

.float-nav .sub a {
  padding-left: 1.2rem;
  font-size: 0.72rem;
}

/* ----- Hero ----- */
.hero {
  text-align: center;
  padding: 2.25rem 0 1.5rem;
  background: #fff;
}

.eyebrow {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--polyu-red);
  margin: 0 0 0.6rem;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.45rem, 3.8vw, 2rem);
  font-weight: 700;
  line-height: 1.22;
  margin: 0 0 0.6rem;
}

.hero-title-main {
  display: block;
  color: var(--polyu-red);
  font-size: clamp(2rem, 6vw, 2.9rem);
  line-height: 1.05;
  margin-bottom: 0.2rem;
}

.hero-title-sub {
  display: block;
}

.tagline {
  font-size: 1.02rem;
  color: var(--text-muted);
  max-width: none;
  margin: 0 auto 1.1rem;
}

.authors { font-size: 0.95rem; line-height: 1.7; margin: 0 0 0.35rem; }
.authors a { font-weight: 500; }

.affiliations, .notes {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 0 0 0.25rem;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem;
  margin-top: 1.1rem;
}

.badge {
  padding: 0.4rem 0.9rem;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1.5px solid var(--polyu-red);
  background: #fff;
  color: var(--polyu-red);
  text-decoration: none;
}

.badge:hover {
  background: rgba(143, 19, 41, 0.06);
  text-decoration: none;
  box-shadow: 0 2px 6px rgba(143, 19, 41, 0.1);
}

/* ----- Showcase (figure-first blocks) ----- */
.showcase {
  padding: 0 0 1.5rem;
  background: #fff;
}

.showcase-fig {
  margin: 0 0 1.75rem;
}

.showcase-fig img {
  border-radius: 6px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.07);
}

.showcase-fig figcaption {
  margin-top: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.5;
}

.showcase-fig figcaption strong { color: var(--text); }

/* ----- Highlights grid ----- */
.highlights {
  padding: 2rem 0;
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.highlight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.85rem;
}

.highlight-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.1rem;
}

.highlight-card h3 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--polyu-red);
  margin: 0 0 0.4rem;
}

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

/* ----- Sections ----- */
section {
  padding: 2.25rem 0;
  border-top: 1px solid var(--border);
}

.section-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--polyu-red);
  margin: 0 0 0.25rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 0.75rem;
}

.section-lead {
  font-size: 1rem;
  color: var(--text-muted);
  margin: 0 0 1.25rem;
  max-width: none;
}

.compact {
  margin: 0.5rem 0;
  font-size: 0.95rem;
}

.compact.muted { color: var(--text-muted); font-size: 0.82rem; }

.compact-list {
  margin: 0.4rem 0 0.75rem;
  padding-left: 1.2rem;
  font-size: 0.95rem;
}

.compact-list li { margin-bottom: 0.25rem; }

.block-heading {
  font-size: 1.06rem;
  font-weight: 600;
  margin: 1.25rem 0 0.5rem;
  color: var(--polyu-red-dark);
}

/* ----- Abstract ----- */
.abstract-box {
  background: var(--card-bg);
  border-left: 4px solid var(--polyu-red);
  padding: 1.1rem 1.25rem;
  border-radius: 0 6px 6px 0;
}

.abstract-box p { margin: 0 0 0.6rem; text-align: justify; }

.keywords {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin: 0;
}

.nowrap-line {
  display: inline-block;
  white-space: nowrap;
}

/* ----- Stats & tags ----- */
.stat-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
  margin: 1rem 0;
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem 0.5rem;
  text-align: center;
}

.stat-card .num {
  display: block;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--polyu-red);
  line-height: 1.2;
}

.stat-card .label {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.category-tags, .model-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0.6rem 0;
}

.category-tags span, .model-tags span, .model-tags a {
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: rgba(143, 19, 41, 0.08);
  color: var(--polyu-red-dark);
  font-weight: 500;
  text-decoration: none;
}

.model-tags span, .model-tags a {
  background: var(--card-bg);
  border: 1px solid var(--border);
}

.model-tags a:hover {
  background: rgba(143, 19, 41, 0.06);
  border-color: rgba(143, 19, 41, 0.35);
  color: var(--polyu-red-dark);
  text-decoration: none;
}

/* ----- Method blocks ----- */
.pipeline-fig, .inline-fig {
  margin: 1rem 0 1.5rem;
}

.pipeline-fig img, .inline-fig img {
  border-radius: 4px;
}

.pipeline-fig figcaption, .inline-fig figcaption {
  margin-top: 0.45rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
  font-style: italic;
}

.method-block {
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.method-block:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.method-block h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--polyu-red-dark);
}

.callout {
  background: rgba(143, 19, 41, 0.06);
  border-left: 3px solid var(--polyu-red);
  padding: 0.6rem 0.85rem;
  font-size: 0.88rem;
  margin: 0.6rem 0;
  border-radius: 0 4px 4px 0;
}

.step-list {
  margin: 0.4rem 0 0;
  padding-left: 1.2rem;
  font-size: 0.9rem;
}

.step-list li { margin-bottom: 0.35rem; }

code {
  font-size: 0.8em;
  background: #eee;
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

/* ----- BibTeX ----- */
.bibtex-wrap {
  position: relative;
  background: #f0f0f0;
  border-radius: 6px;
  padding: 1rem 1.15rem;
}

.bibtex-wrap pre {
  margin: 0;
  font-family: ui-monospace, monospace;
  font-size: 0.78rem;
  line-height: 1.45;
  white-space: pre-wrap;
}

.copy-btn {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  padding: 0.3rem 0.65rem;
  font-size: 0.72rem;
  font-weight: 600;
  background: #fff;
  color: var(--polyu-red);
  border: 1.5px solid var(--polyu-red);
  border-radius: 4px;
  cursor: pointer;
}

.copy-btn.copied {
  background: #2d6a4f;
  color: #fff;
  border-color: #2d6a4f;
}

/* ----- Footer ----- */
.site-footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  background: var(--card-bg);
}

@media (max-width: 1200px) {
  .float-nav { display: none; }
}

@media (max-width: 560px) {
  .stat-row { grid-template-columns: repeat(2, 1fr); }
  .hero { padding-top: 1.5rem; }
}