:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #5a5a5a;
  --color-accent: #0066cc;
  --color-accent-hover: #0052a3;
  --color-border: #e5e5e5;
  --color-code-bg: #f5f5f5;
  --font-serif: 'Source Serif 4', Georgia, serif;
  --font-sans: 'IBM Plex Sans', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --max-width: 900px;
  --spacing-unit: 1rem;
}

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
}

/* Header */
.header {
  background: linear-gradient(180deg, #fff 0%, var(--color-bg) 100%);
  padding: 4rem 2rem 3rem;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.venue-badge {
  display: inline-block;
  background: linear-gradient(135deg, #1e3a5f 0%, #2d5a87 100%);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.4rem 1rem;
  border-radius: 2rem;
  margin-bottom: 1.5rem;
}

.title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
  max-width: 1000px;
  margin: 0 auto 1rem;
  color: var(--color-text);
}

.subtitle {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* Authors */
.authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  margin-bottom: 0.75rem;
}

.author {
  font-size: 1rem;
}

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

.author a:hover {
  opacity: 0.7;
}

.author sup {
  color: var(--color-accent);
  font-weight: 600;
}

.affiliations {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.annotations {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-bottom: 2rem;
}

/* Links */
.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.2s ease;
}

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

.link-btn.primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.link-btn.secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.link-btn.secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.link-btn svg {
  width: 18px;
  height: 18px;
}

/* Main Content */
.main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 2rem;
}

section {
  margin-bottom: 3rem;
}

h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-border);
}

.section-title {
  text-align: center;
}

p {
  margin-bottom: 1rem;
  color: var(--color-text);
}

/* Teaser Figure */
.teaser {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 3rem;
}

.teaser-placeholder {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, #f0f0f0 0%, #e8e8e8 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 1rem;
}

.teaser-placeholder svg {
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.teaser-caption {
  padding: 1rem 1.5rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

/* Abstract */
.abstract-text {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.8;
  text-align: justify;
}

/* Results placeholder */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
}

.result-card .metric {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.result-card .label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

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

.bibtex {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre;
}

.copy-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.4rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

/* Footer */
.footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

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

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

/* WIP Banner */
.wip-banner {
  background: #fff3cd;
  border-bottom: 1px solid #ffc107;
  padding: 0.75rem;
  text-align: center;
  font-size: 0.85rem;
  color: #856404;
}

@media (max-width: 600px) {
  .header {
    padding: 3rem 1.5rem 2rem;
  }
  .main {
    padding: 2rem 1.5rem;
  }
  .authors {
    gap: 0.25rem 1rem;
  }
}