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

:root {
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'Source Code Pro', ui-monospace, monospace;
  --bg: #ffffff;
  --fg: #111;
  --fg-2: #444;
  --fg-3: #888;
  --border: #e5e5e5;
  --accent: #c2185b;
  --code-bg: #1a1a1a;
  --code-fg: #e0e0e0;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--fg);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* ===== Layout ===== */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: 3rem 0;
  border-top: 1px solid var(--border);
}

h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
  text-align: center;
}

h3 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--fg-3);
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
  color: var(--fg-2);
}

a { color: var(--fg); text-decoration: underline; text-decoration-color: var(--border); text-underline-offset: 2px; }
a:hover { text-decoration-color: var(--fg); }

.mono {
  font-family: var(--mono);
  font-size: 0.92em;
}

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: 5rem 2rem 2rem;
}

.hero .title {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.hero .subtitle {
  font-size: 1.55rem;
  font-weight: 400;
  color: var(--fg);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.hero .authors {
  font-size: 0.98rem;
  margin-bottom: 0.5rem;
  line-height: 2;
  color: var(--fg);
}

.hero .authors span { white-space: nowrap; }
.hero .authors span:not(:last-child)::after { content: ', '; }
.hero .authors a { color: var(--fg); text-decoration: none; }
.hero .authors a:hover { color: var(--accent); }
.hero .authors sup { font-size: 0.65em; color: var(--fg-3); }

.hero .affiliations {
  font-size: 0.82rem;
  color: #555;
  margin-bottom: 0.2rem;
}

.hero .note {
  font-size: 0.78rem;
  color: #555;
  margin-bottom: 1.75rem;
}

.links {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.45rem 1.4rem;
  border: 1.5px solid var(--fg);
  border-radius: 4px;
  color: var(--fg);
  font-weight: 500;
  font-size: 0.88rem;
  text-decoration: none;
  transition: all 0.15s;
}

.btn:hover {
  background: var(--fg);
  color: #fff;
}

/* ===== Alternating section backgrounds ===== */
.hero, #benchmark, #examples, #citation {
  background: #fafafa;
}

/* ===== Key Results ===== */

.key-results-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0 2rem;
  font-size: 0.92rem;
}

.key-results-table thead th {
  font-weight: 600;
  text-align: left;
  padding: 0.7rem 1rem;
  border-bottom: 2px solid var(--fg);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.key-results-table thead th:not(:first-child) { text-align: center; }

.key-results-table tbody td {
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--fg-2);
}

.key-results-table tbody td:not(:first-child) { text-align: center; }

.key-results-table .highlight-row td {
  background: #fff7ed;
  color: var(--fg);
  font-weight: 500;
}

/* Discoveries */
.discoveries {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 640px) {
  .discoveries { grid-template-columns: 1fr; }
}

.discovery {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.5rem;
  background: #fff;
  position: relative;
}

.discovery-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 3px;
  padding: 0.15rem 0.5rem;
  margin-bottom: 0.75rem;
}

.discovery h3 {
  text-transform: none;
  letter-spacing: -0.01em;
  font-size: 1rem;
  color: var(--fg);
  margin-bottom: 0.5rem;
}

.discovery p {
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 0;
}

/* ===== Abstract ===== */
.abstract-text {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--fg-2);
  text-align: justify;
}

/* ===== Example Problems ===== */
.example {
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 1.25rem;
}

.example-header {
  padding: 1.25rem 1.5rem 1rem;
  border-bottom: 1px solid var(--border);
  background: #fafafa;
}

.example-meta {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-bottom: 0.6rem;
}

.tag {
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--fg-3);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.15rem 0.5rem;
}

.example-header h3 {
  text-transform: none;
  letter-spacing: -0.01em;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 0.25rem;
}

.example-source {
  font-size: 0.82rem;
  color: var(--fg-3);
  margin-bottom: 0;
}

.example-body {
  padding: 1.25rem 1.5rem;
}

.example-body p {
  font-size: 0.92rem;
  line-height: 1.7;
}

.math-block {
  text-align: center;
  padding: 1rem 0.5rem;
  margin: 1rem 0;
  overflow-x: auto;
  color: var(--fg);
}

details {
  margin-top: 0.75rem;
}

details summary {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--fg-2);
  cursor: pointer;
  user-select: none;
  padding: 0.3rem 0;
}

details summary:hover {
  color: var(--fg);
}

details summary::marker {
  color: var(--fg-3);
}

details pre {
  margin-top: 0.5rem;
}

pre {
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.65;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
  font-family: var(--mono);
}

/* ===== Stats Row ===== */
.stats-row {
  display: flex;
  justify-content: center;
  gap: 4rem;
  margin: 2.5rem 0;
  flex-wrap: wrap;
}

.stat { text-align: center; }

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--fg-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ===== Two Column ===== */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

@media (max-width: 640px) {
  .two-col { grid-template-columns: 1fr; }
}

/* ===== Tables ===== */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

thead th {
  font-weight: 600;
  text-align: left;
  padding: 0.55rem 0.75rem;
  border-bottom: 2px solid var(--fg);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--fg);
}

tbody td {
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid var(--border);
  color: var(--fg-2);
}

.table-wrapper { overflow-x: auto; }

.comparison-table { min-width: 480px; }

.comparison-table td:nth-child(n+3),
.comparison-table th:nth-child(n+3) {
  text-align: center;
}

.ours-row td {
  background: #f0fdf4;
}

/* ===== BibTeX ===== */
.bibtex {
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.65;
}

/* ===== Footer ===== */
footer {
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 2rem;
}

footer p {
  color: var(--fg-3);
  font-size: 0.82rem;
}

footer a { color: var(--fg-3); }
footer a:hover { color: var(--fg); }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .hero { padding: 3.5rem 1.25rem 2.5rem; }
  .hero .title { font-size: 2rem; }
  .hero .subtitle { font-size: 1rem; }
  .container { padding: 0 1.25rem; }
  .section { padding: 3rem 0; }
  .stats-row { gap: 2rem; }
  .stat-number { font-size: 2rem; }
}