:root {
  --primary: #1a365d;
  --accent: #2b6cb0;
  --bg: #ffffff;
  --bg-alt: #f7fafc;
  --text: #2d3748;
  --text-light: #718096;
  --border: #e2e8f0;
  --max-width: 960px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--bg);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Hero */
.hero {
  text-align: center;
  padding: 60px 0 40px;
}

.hero h1 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.hero h1 .highlight {
  color: var(--accent);
}

.venue {
  font-size: 1rem;
  color: var(--text-light);
  margin-bottom: 20px;
}

.authors {
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: 6px;
}

.affiliations {
  font-size: 0.95rem;
  color: var(--text-light);
  margin-bottom: 24px;
}

.links {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 6px;
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-paper {
  background: var(--primary);
  color: #fff;
}
.btn-paper:hover {
  background: #0f2440;
}

.btn-code {
  background: #2d3748;
  color: #fff;
}
.btn-code:hover {
  background: #1a202c;
}

.btn-data {
  background: #ed8936;
  color: #fff;
}
.btn-data:hover {
  background: #dd6b20;
}

/* Navigation */
nav {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 32px;
  padding: 12px 0;
}

nav a {
  text-decoration: none;
  color: var(--text);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--accent);
}

/* Sections */
section {
  padding: 48px 0;
}

section:nth-child(even) {
  background: var(--bg-alt);
}

h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 20px;
  text-align: center;
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--primary);
  margin: 24px 0 10px;
}

p {
  margin-bottom: 14px;
}

/* Abstract */
.abstract-text {
  text-align: justify;
  font-size: 0.98rem;
  max-width: 800px;
  margin: 0 auto;
}

/* Figures */
.figure {
  margin: 28px 0;
  text-align: center;
}

.figure img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

.figure .caption {
  font-size: 0.88rem;
  color: var(--text-light);
  margin-top: 10px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.5;
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  margin: 20px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

thead {
  background: var(--primary);
  color: #fff;
}

th {
  padding: 10px 12px;
  text-align: center;
  font-weight: 600;
}

td {
  padding: 8px 12px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

tbody tr:hover {
  background: #edf2f7;
}

tr.highlight-row {
  background: #ebf8ff;
  font-weight: 600;
}

tr.highlight-row:hover {
  background: #d4edfc;
}

tr.traditional-row {
  background: #f7f7f7;
  color: #666;
}

tr.traditional-row:hover {
  background: #ededf0;
}

/* Key findings */
.findings {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.finding-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  border-left: 4px solid var(--accent);
}

.finding-card h4 {
  font-size: 0.95rem;
  color: var(--primary);
  margin-bottom: 8px;
}

.finding-card p {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 0;
}

/* Benchmark comparison */
.benchmark-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 20px 0;
}

.benchmark-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.benchmark-card .card-header {
  background: var(--primary);
  color: #fff;
  padding: 12px 16px;
  font-weight: 600;
}

.benchmark-card .card-body {
  padding: 16px;
  font-size: 0.92rem;
}

.benchmark-card .card-body ul {
  padding-left: 18px;
  margin: 8px 0;
}

.benchmark-card .card-body li {
  margin-bottom: 4px;
}

/* Citation */
.citation-block {
  background: #1a202c;
  color: #e2e8f0;
  padding: 20px 24px;
  border-radius: 8px;
  font-family: 'Fira Code', 'Consolas', monospace;
  font-size: 0.82rem;
  line-height: 1.6;
  overflow-x: auto;
  position: relative;
  white-space: pre;
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: #4a5568;
  color: #e2e8f0;
  border: none;
  padding: 4px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.78rem;
  transition: background 0.2s;
}

.copy-btn:hover {
  background: #718096;
}

/* Footer */
footer {
  text-align: center;
  padding: 30px 0;
  border-top: 1px solid var(--border);
  color: var(--text-light);
  font-size: 0.85rem;
}

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

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 1.6rem;
  }

  nav ul {
    gap: 16px;
    flex-wrap: wrap;
  }

  .benchmark-grid {
    grid-template-columns: 1fr;
  }

  .findings {
    grid-template-columns: 1fr;
  }
}

/* Metric formula */
.metric-overview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 20px 0;
}

.metric-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
}

.metric-card h4 {
  font-size: 1.05rem;
  color: var(--accent);
  margin-bottom: 10px;
}

.metric-card p {
  font-size: 0.92rem;
  color: var(--text);
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .metric-overview {
    grid-template-columns: 1fr;
  }
}

.samples-grid {
  margin: 20px 0;
}

.samples-grid .figure {
  margin: 16px 0;
}