/* CAP-Bench project site — modern academic style */

:root {
  --bg: #fdfcfb;
  --fg: #0f172a;
  --fg-soft: #334155;
  --muted: #64748b;
  --muted-light: #94a3b8;

  --accent: #7c3aed;        /* violet */
  --accent-2: #2563eb;      /* blue */
  --accent-3: #ec4899;      /* pink */
  --accent-soft: #ede9fe;

  --soft: #f8fafc;
  --soft-2: #f1f5f9;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;

  --code-bg: #0f172a;
  --code-fg: #e2e8f0;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow:    0 4px 16px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.08), 0 2px 6px rgba(15, 23, 42, 0.04);

  --gradient-hero: radial-gradient(ellipse 80% 50% at 50% -10%,
                     rgba(124, 58, 237, 0.15), transparent 60%),
                   radial-gradient(ellipse 60% 40% at 80% 20%,
                     rgba(236, 72, 153, 0.10), transparent 60%),
                   radial-gradient(ellipse 70% 50% at 20% 30%,
                     rgba(37, 99, 235, 0.10), transparent 60%);
  --gradient-text: linear-gradient(135deg, #7c3aed 0%, #2563eb 50%, #ec4899 100%);
  --gradient-cap: linear-gradient(135deg, #a78bfa 0%, #60a5fa 50%, #f472b6 100%);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
               "Noto Sans", "PingFang SC", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--fg-soft);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--accent-2); text-decoration: underline; text-underline-offset: 3px; }

h1, h2, h3, h4 { color: var(--fg); font-weight: 700; letter-spacing: -0.02em; }
strong { color: var(--fg); font-weight: 600; }
code {
  font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: var(--soft-2);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--accent);
}

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 780px; margin: 0 auto; padding: 0 24px; }

/* Highlight letters in CAP */
.cap-letter {
  background: linear-gradient(135deg, #7c3aed 0%, #2563eb 50%, #ec4899 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  font-weight: 800;
  font-size: 1.18em;
  line-height: 0.9;
}

/* Top nav */
nav.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(253, 252, 251, 0.8);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  border-bottom: 1px solid var(--border);
}
nav.topbar .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
nav.topbar .brand {
  font-weight: 800; font-size: 1.1rem; color: var(--fg);
  letter-spacing: -0.02em;
}
nav.topbar .brand:hover { text-decoration: none; }
nav.topbar .brand .dot {
  display: inline-block; width: 8px; height: 8px;
  background: var(--gradient-text);
  border-radius: 50%; margin-right: 8px; vertical-align: middle;
}
nav.topbar ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 28px; }
nav.topbar ul a {
  color: var(--muted); font-size: 0.92rem; font-weight: 500;
  transition: color 0.15s;
}
nav.topbar ul a:hover { color: var(--fg); text-decoration: none; }

/* Hero */
.hero {
  position: relative;
  padding: 96px 0 56px;
  text-align: center;
  background: var(--gradient-hero);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(15, 23, 42, 0.04) 1px, transparent 0);
  background-size: 24px 24px;
  pointer-events: none;
  mask-image: linear-gradient(180deg, black 0%, transparent 80%);
  -webkit-mask-image: linear-gradient(180deg, black 0%, transparent 80%);
}
.hero > .container { position: relative; z-index: 1; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(124, 58, 237, 0.08);
  color: var(--accent);
  font-size: 0.82rem; font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 24px;
  border: 1px solid rgba(124, 58, 237, 0.18);
}
.hero-badge .pulse {
  width: 6px; height: 6px; background: var(--accent);
  border-radius: 50%; box-shadow: 0 0 0 0 rgba(124, 58, 237, 0.4);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(124, 58, 237, 0.5); }
  70%  { box-shadow: 0 0 0 8px rgba(124, 58, 237, 0); }
  100% { box-shadow: 0 0 0 0 rgba(124, 58, 237, 0); }
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  margin: 0;
  line-height: 1.15;
  letter-spacing: -0.035em;
  font-weight: 800;
}
.hero .subtitle {
  font-size: 1.18rem;
  color: var(--fg-soft);
  max-width: 780px;
  margin: 24px auto 36px;
  line-height: 1.6;
}
.hero .authors {
  font-size: 0.95rem; color: var(--muted);
  max-width: 820px;
  margin: 0 auto 12px;
  line-height: 1.85;
}
.hero .authors a { color: var(--fg-soft); border-bottom: 1px dotted var(--border-strong); }
.hero .authors a:hover { color: var(--accent); border-bottom-color: var(--accent); text-decoration: none; }
.hero .affiliations {
  font-size: 0.85rem; color: var(--muted);
  max-width: 820px;
  margin: 0 auto 32px;
  line-height: 1.7;
}
.hero .affiliations sup { font-size: 0.7em; color: var(--accent); font-weight: 700; }

.btn-row {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 10px;
  margin-top: 24px;
}
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 20px;
  border-radius: 999px;
  background: var(--fg);
  color: #fff !important;
  font-weight: 600; font-size: 0.93rem;
  border: 1px solid var(--fg);
  transition: all 0.18s ease;
  box-shadow: var(--shadow-sm);
}
.btn:hover {
  background: #000; color: #fff !important;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.btn.outline {
  background: #fff; color: var(--fg) !important;
  border-color: var(--border-strong);
}
.btn.outline:hover {
  background: var(--soft); color: var(--fg) !important;
  border-color: var(--accent);
}
.btn.gradient {
  background: var(--gradient-text); border-color: transparent;
}
.btn.gradient:hover { transform: translateY(-2px); filter: brightness(1.05); }
.btn.disabled {
  background: #fff; color: var(--muted) !important;
  border: 1px dashed var(--border-strong);
  cursor: not-allowed; pointer-events: none;
  box-shadow: none; opacity: 1;
}
.btn .icon { font-size: 1.05em; }

/* Stats strip */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 48px auto 0;
  max-width: 880px;
}
.stat {
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 16px;
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}
.stat:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.stat .num {
  font-size: 2rem; font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: block;
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat .label {
  font-size: 0.82rem; color: var(--muted);
  margin-top: 6px; display: block;
  font-weight: 500;
}

/* Sections */
section {
  padding: 96px 0;
  position: relative;
}
section.alt-bg {
  background: var(--soft);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
section h2 {
  font-size: clamp(1.7rem, 3vw, 2.25rem);
  margin: 0 0 12px;
  letter-spacing: -0.025em;
}
section .eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
section .lead {
  color: var(--muted);
  margin: 0 0 36px;
  font-size: 1.08rem;
  max-width: 720px;
  line-height: 1.65;
}

/* Figure block */
.figure {
  margin: 36px auto;
  text-align: center;
  max-width: 1000px;
}
.figure img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.figure figcaption {
  font-size: 0.9rem; color: var(--muted);
  margin-top: 16px;
  max-width: 760px;
  margin-left: auto; margin-right: auto;
  line-height: 1.6;
}
.figure figcaption strong { color: var(--fg-soft); }

/* Construction phases card grid */
.phase-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 32px;
}
.phase {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 20px;
  position: relative;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.phase:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}
.phase .num {
  display: inline-flex;
  align-items: center; justify-content: center;
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700; font-size: 0.95rem;
  margin-bottom: 12px;
}
.phase h3 {
  font-size: 1rem;
  margin: 0 0 6px;
  color: var(--fg);
}
.phase p {
  font-size: 0.9rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.55;
}

/* Findings */
.findings {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 32px;
}
.finding {
  position: relative;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 26px 28px;
  transition: transform 0.2s, box-shadow 0.2s;
  overflow: hidden;
}
.finding::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: var(--gradient-text);
  opacity: 0.85;
}
.finding:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.finding .num {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
  display: block;
  margin-bottom: 4px;
}
.finding h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
  color: var(--fg);
  font-weight: 700;
}
.finding p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--fg-soft);
  line-height: 1.6;
}

/* C-A-P pillars */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 32px 0;
}
.pillar {
  text-align: center;
  padding: 32px 24px;
  border-radius: 16px;
  background: #fff;
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.pillar:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.pillar .glyph {
  display: inline-flex;
  align-items: center; justify-content: center;
  width: 56px; height: 56px;
  font-size: 1.6rem;
  font-weight: 800;
  border-radius: 16px;
  margin-bottom: 16px;
  color: #fff;
}
.pillar.c .glyph { background: linear-gradient(135deg, #a78bfa, #7c3aed); }
.pillar.a .glyph { background: linear-gradient(135deg, #60a5fa, #2563eb); }
.pillar.p .glyph { background: linear-gradient(135deg, #f472b6, #db2777); }
.pillar h4 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--fg);
}
.pillar p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.55;
}

/* Leaderboard */
.lb-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 8px;
  box-shadow: var(--shadow-sm);
  overflow-x: auto;
  margin-top: 24px;
}
table.leaderboard {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.93rem;
}
table.leaderboard th, table.leaderboard td {
  text-align: right;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
table.leaderboard th:first-child,
table.leaderboard td:first-child,
table.leaderboard th:nth-child(2),
table.leaderboard td:nth-child(2) {
  text-align: left;
}
table.leaderboard thead th {
  background: var(--soft);
  font-weight: 600;
  font-size: 0.84rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: pointer; user-select: none;
  position: sticky; top: 0;
  border-bottom: 2px solid var(--border-strong);
}
table.leaderboard thead th.sortable:hover { background: var(--accent-soft); color: var(--accent); }
table.leaderboard thead th .arrow {
  color: var(--muted-light);
  margin-left: 4px;
  font-size: 0.85em;
  transition: color 0.15s;
}
table.leaderboard thead th.sortable:hover .arrow { color: var(--accent); }
table.leaderboard tbody tr {
  transition: background 0.15s;
}
table.leaderboard tbody tr:hover { background: var(--soft); }
table.leaderboard tbody tr:last-child td { border-bottom: none; }

table.leaderboard td .std {
  color: var(--muted-light);
  font-size: 0.82em;
  margin-left: 3px;
  font-weight: 400;
}
table.leaderboard td:nth-child(3) { font-weight: 700; color: var(--fg); }
table.leaderboard tr.reference {
  background: linear-gradient(90deg, rgba(254, 243, 199, 0.4), rgba(254, 243, 199, 0.1));
}
table.leaderboard tr.reference:hover { background: linear-gradient(90deg, rgba(254, 243, 199, 0.6), rgba(254, 243, 199, 0.2)); }

table.leaderboard td:first-child {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  min-width: 56px;
}
table.leaderboard td:nth-child(2) {
  min-width: 200px;
  line-height: 1.45;
}
table.leaderboard td:nth-child(2) strong {
  display: inline;
  white-space: nowrap;
}
table.leaderboard td:nth-child(2) .cat-badge {
  white-space: nowrap;
  margin-left: 8px;
}
table.leaderboard th, table.leaderboard td {
  padding: 14px 12px;
}
table.leaderboard th:not(:first-child):not(:nth-child(2)),
table.leaderboard td:not(:first-child):not(:nth-child(2)) {
  white-space: nowrap;
}
table.leaderboard td:first-child .medal {
  display: inline-block;
  margin-right: 4px;
  font-size: 1.1em;
  vertical-align: -1px;
}

.cat-badge {
  display: inline-block;
  font-size: 0.7rem;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-left: 10px;
  vertical-align: middle;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.cat-badge.opensource { background: #d1fae5; color: #065f46; }
.cat-badge.reference  { background: #fef3c7; color: #92400e; }

/* BibTeX */
pre.bibtex {
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: 12px;
  padding: 24px 28px;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.65;
  font-family: "JetBrains Mono", "SF Mono", Menlo, monospace;
  position: relative;
  margin-top: 16px;
  box-shadow: var(--shadow);
}
.copy-btn {
  position: absolute;
  top: 12px; right: 12px;
  padding: 5px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--code-fg);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s;
}
.copy-btn:hover { background: rgba(255, 255, 255, 0.2); }

/* Footer */
footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
  padding: 36px 0;
  border-top: 1px solid var(--border);
  background: var(--soft);
}
footer a { color: var(--muted); }
footer a:hover { color: var(--accent); }

/* Bullet lists in markdown-ish content */
.markdown ul, .markdown ol { padding-left: 1.4em; }
.markdown li { margin: 0.25em 0; }

/* Responsive */
@media (max-width: 900px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .findings { grid-template-columns: 1fr; }
  .pillars { grid-template-columns: 1fr; }
  .phase-grid { grid-template-columns: repeat(2, 1fr); }
  nav.topbar ul { display: none; }
  .hero { padding: 64px 0 40px; }
  section { padding: 64px 0; }
  table.leaderboard { font-size: 0.85rem; }
  table.leaderboard th, table.leaderboard td { padding: 10px 10px; }
}

@media (max-width: 540px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .phase-grid { grid-template-columns: 1fr; }
  .container, .container-sm { padding: 0 18px; }
}