/* MTEB-PT — academic-clean static site */
:root {
  --accent: #14529b;
  --accent-dark: #0e3c72;
  --ink: #1b1f24;
  --muted: #5b6671;
  --bg: #ffffff;
  --soft: #f6f8fa;
  --line: #e2e6ea;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", "Fira Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 920px; margin: 0 auto; padding: 0 24px; }

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

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.2; color: var(--ink); letter-spacing: -0.01em; }
.hero .lead, section p.intro, article.post .body p { text-align: justify; -webkit-hyphens: auto; hyphens: auto; }

/* ---- header ---- */
header.site {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { font-family: var(--serif); font-size: 22px; font-weight: 600; color: var(--ink); letter-spacing: -0.02em; }
.brand:hover { text-decoration: none; }
nav.site a { color: var(--muted); font-size: 15px; margin-left: 22px; }
nav.site a:hover { color: var(--accent); text-decoration: none; }
nav.site a.nav-ico { display: inline-flex; align-items: center; margin-left: 16px; }
nav.site a.nav-ico svg { width: 18px; height: 18px; }
nav.site a.nav-ico .hf { font-size: 17px; line-height: 1; }

/* ---- hero ---- */
.hero { padding: 56px 0 26px; border-bottom: 1px solid var(--line); }
.hero h1 { font-size: 58px; margin: 0 0 6px; }
.hero .sub { font-family: var(--serif); font-size: 25px; color: var(--muted); margin: 0 0 22px; font-weight: 400; }
.hero .lead { font-size: 19px; max-width: 680px; color: #333a42; }
.hero .lead strong { color: var(--ink); }

.stats { display: flex; flex-wrap: wrap; gap: 0; margin: 30px 0 26px; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.stat { flex: 1 1 0; min-width: 130px; padding: 16px 18px; border-right: 1px solid var(--line); background: var(--soft); }
.stat:last-child { border-right: none; }
.stat .n { font-family: var(--serif); font-size: 28px; font-weight: 600; color: var(--accent); }
.stat .l { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }

.btnrow { display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 11px 20px; border-radius: 8px; font-size: 15px; font-weight: 500; border: 1px solid var(--accent); }
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-dark); text-decoration: none; }
.btn.ghost { background: #fff; color: var(--accent); }
.btn.ghost:hover { background: var(--soft); text-decoration: none; }
.btn svg { vertical-align: -3px; margin-right: 7px; }
.btn .ico { margin-right: 7px; font-size: 1.05em; vertical-align: -1px; }

/* ---- sections ---- */
section { padding: 52px 0; border-bottom: 1px solid var(--line); }
section h2 { font-size: 30px; margin: 0 0 8px; }
section .kicker { text-transform: uppercase; letter-spacing: 0.08em; font-size: 13px; color: var(--accent); font-weight: 600; margin-bottom: 6px; }
section p.intro { font-size: 18px; color: #333a42; max-width: 720px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 28px; }
.card { border: 1px solid var(--line); border-radius: 10px; padding: 22px; background: #fff; }
.card h3 { font-size: 19px; margin: 0 0 8px; }
.card p { font-size: 15px; color: var(--muted); margin: 0; }
.card .big { font-family: var(--serif); font-size: 22px; color: var(--accent); font-weight: 600; }

/* ---- leaderboard embed ---- */
.embed { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; margin-top: 24px; background: var(--soft); }
.embed iframe { width: 100%; height: 760px; border: 0; display: block; }
.embed-note { font-size: 14px; color: var(--muted); margin-top: 12px; }

/* ---- native leaderboard ---- */
.chart { width: 100%; height: 460px; border: 1px solid var(--line); border-radius: 10px; background: #fff; margin-top: 8px; }
.chart-cap { font-size: 14px; color: var(--muted); margin: 12px 0 0; text-align: center; }
.badge { display: inline-block; font-size: 10px; font-weight: 600; letter-spacing: 0.04em; padding: 2px 6px; border-radius: 4px; vertical-align: middle; margin-left: 6px; }
.badge.open { background: #e7f3ea; color: #1a7f37; }
.badge.closed { background: #fbeae5; color: #b3431a; }
.lbtable-wrap { margin-top: 30px; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.lbtable { width: 100%; border-collapse: collapse; font-size: 15px; }
.lbtable th { text-align: left; background: var(--soft); padding: 11px 14px; font-family: var(--sans); font-weight: 600; border-bottom: 1px solid var(--line); font-size: 12px; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted); }
.lbtable td { padding: 10px 14px; border-bottom: 1px solid var(--line); }
.lbtable tr:last-child td { border-bottom: none; }
.lbtable tbody tr:hover td { background: #fafcfe; }
.lbtable td.r { color: var(--muted); width: 36px; }
.lbtable td.num { text-align: right; font-variant-numeric: tabular-nums; }
.lbtable td.b { font-weight: 600; color: var(--ink); }

/* ---- submit ---- */
.channels { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 24px; }
.channel { border: 1px solid var(--line); border-radius: 10px; padding: 22px; background: #fff; }
.channel h3 { font-size: 18px; margin: 0 0 6px; }
.channel p { font-size: 15px; color: var(--muted); margin: 0 0 14px; }
@media (max-width: 680px) { .channels { grid-template-columns: 1fr; } .chart { height: 360px; } }

/* ---- blog list ---- */
.posts { margin-top: 24px; }
.post-item { display: flex; gap: 18px; align-items: center; padding: 20px 0; border-top: 1px solid var(--line); }
.post-item:hover { text-decoration: none; }
.ptile { flex: 0 0 auto; width: 52px; height: 52px; border-radius: 11px; display: flex; align-items: center; justify-content: center; background: #eef1f5; color: #3a6098; }
.ptile svg { width: 23px; height: 23px; }
.ptxt { min-width: 0; }
.post-item .date { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.post-item h3 { font-size: 22px; margin: 4px 0 6px; color: var(--ink); }
.post-item:hover h3 { color: var(--accent); }
.post-item p { color: var(--muted); margin: 0; font-size: 16px; }
.post-item .more { color: var(--accent); font-size: 15px; font-weight: 500; }

/* ---- article ---- */
article.post { padding: 56px 0; }
article.post .date { color: var(--muted); font-size: 14px; text-transform: uppercase; letter-spacing: 0.05em; }
article.post h1 { font-size: 40px; margin: 8px 0 6px; max-width: 760px; }
article.post .byline { color: var(--muted); font-size: 15px; margin-bottom: 30px; }
article.post .body { max-width: 720px; font-size: 18px; }
article.post .body h2 { font-size: 26px; margin: 38px 0 10px; }
article.post .body p { margin: 16px 0; }
article.post .body ul, article.post .body ol { padding-left: 22px; }
article.post .body li { margin: 6px 0; }
article.post .body code { font-family: var(--mono); font-size: 0.88em; background: var(--soft); padding: 2px 6px; border-radius: 4px; }
article.post .body pre { background: #0f1722; color: #e6edf3; padding: 18px; border-radius: 10px; overflow-x: auto; font-family: var(--mono); font-size: 14px; line-height: 1.5; }
article.post .body pre code { background: none; padding: 0; color: inherit; }
article.post .body blockquote { border-left: 3px solid var(--accent); margin: 20px 0; padding: 4px 18px; color: var(--muted); font-style: italic; }
.back { display: inline-block; margin-bottom: 18px; font-size: 15px; color: var(--muted); }

figure.fig { margin: 26px 0; }
figure.fig img { width: 100%; height: auto; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
figure.fig figcaption { font-size: 14px; color: var(--muted); margin-top: 10px; text-align: center; }

table.data { border-collapse: collapse; width: 100%; margin: 20px 0; font-size: 15px; }
table.data th, table.data td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
table.data th { background: var(--soft); font-family: var(--sans); font-weight: 600; }
table.data td.num { text-align: right; font-variant-numeric: tabular-nums; }

/* ---- footer ---- */
footer.site { padding: 44px 0 56px; background: var(--soft); }
footer.site .verda { font-size: 16px; margin-bottom: 18px; }
footer.site .verda a { font-weight: 600; }
footer.site .cols { display: flex; flex-wrap: wrap; gap: 40px; justify-content: space-between; }
footer.site .col h4 { font-family: var(--sans); font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin: 0 0 10px; }
footer.site .col a { display: block; color: var(--ink); font-size: 15px; margin: 5px 0; }
footer.site .meta { margin-top: 30px; font-size: 14px; color: var(--muted); border-top: 1px solid var(--line); padding-top: 18px; }

/* ---- responsive ---- */
@media (max-width: 680px) {
  .hero h1 { font-size: 42px; }
  .hero .sub { font-size: 20px; }
  .cards { grid-template-columns: 1fr; }
  .stat { border-right: none; border-bottom: 1px solid var(--line); }
  nav.site a { margin-left: 14px; font-size: 14px; }
  .brand { font-size: 19px; }
}