/* ===========================================================================
   KuralHub — minimal, professional documentation-style theme.
   Neutral palette · one restrained accent · calm, organized, low-motion.
   =========================================================================== */

:root {
  /* Neutral palette */
  --bg:         #ffffff;
  --bg-subtle:  #f7f8fa;
  --bg-sunken:  #f2f3f5;
  --ink:        #1c1e21;
  --text:       #303437;
  --muted:      #646b72;
  --faint:      #8b9198;
  --border:     #e4e7eb;
  --border-str: #d4d8dd;

  /* Single restrained accent */
  --accent:     #2f6fed;
  --accent-700: #1f55c8;
  --accent-bg:  #eef3fe;

  /* Status (benchmark heat) — muted, not loud */
  --good:       #15784f;
  --good-bg:    #e7f4ee;
  --mid:        #9a6b12;
  --mid-bg:     #fbf3e2;
  --low:        #b4452f;
  --low-bg:     #fbecea;

  --radius:     10px;
  --radius-sm:  8px;
  --shadow-sm:  0 1px 2px rgba(20,24,28,.05);
  --shadow:     0 1px 3px rgba(20,24,28,.07), 0 1px 2px rgba(20,24,28,.04);
  --maxw:       1080px;
  --maxw-prose: 760px;
  --font:       'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono:       'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 { line-height: 1.25; letter-spacing: -0.011em; font-weight: 650; margin: 0; color: var(--ink); }
p { margin: 0 0 1rem; }
a { color: var(--accent-700); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
hr { border: 0; border-top: 1px solid var(--border); margin: 0; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.eyebrow {
  font-size: .76rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent-700); margin-bottom: .7rem;
}
/* legacy gradient class -> flat ink, keeps old markup working */
.text-grad { color: var(--ink); }

/* ---------- Navigation ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.9);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: .55rem; font-weight: 700; font-size: 1.1rem; letter-spacing: -.02em; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand .logo {
  width: 28px; height: 28px; border-radius: 7px; background: var(--ink);
  display: grid; place-items: center; color: #fff;
}
.brand .logo svg { width: 16px; height: 16px; }
.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-links a {
  color: var(--muted); font-weight: 500; font-size: .92rem; padding: .45rem .7rem; border-radius: 7px;
}
.nav-links a:hover { color: var(--ink); background: var(--bg-subtle); text-decoration: none; }
.nav-links a.active { color: var(--ink); font-weight: 600; }
.nav-cta {
  display: inline-flex; align-items: center; gap: .4rem; color: var(--muted) !important; font-weight: 500;
}
.nav-cta:hover { color: var(--ink) !important; background: var(--bg-subtle); }
.nav-cta svg { width: 16px; height: 16px; }
.nav-toggle { display: none; background: none; border: 0; color: var(--ink); cursor: pointer; padding: 8px; }
.nav-toggle svg { width: 22px; height: 22px; }

@media (max-width: 760px) {
  .nav-links {
    position: absolute; top: 60px; left: 0; right: 0; flex-direction: column; align-items: stretch;
    background: var(--bg); border-bottom: 1px solid var(--border); padding: 8px; gap: 2px;
    box-shadow: var(--shadow); display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: .7rem 1rem; }
  .nav-toggle { display: block; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .45rem; font-weight: 550; font-size: .93rem;
  padding: .6rem 1.1rem; border-radius: var(--radius-sm); cursor: pointer; border: 1px solid transparent;
  transition: background .15s ease, border-color .15s ease, color .15s ease; text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn svg { width: 17px; height: 17px; }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: #000; }
.btn-ghost, .btn-light {
  background: var(--bg); color: var(--ink); border-color: var(--border-str);
}
.btn-ghost:hover, .btn-light:hover { background: var(--bg-subtle); border-color: var(--faint); }
.btn-dark { background: var(--ink); color: #fff; }
.btn-dark:hover { background: #000; }

/* ---------- Hero (light, calm) ---------- */
.hero { background: var(--bg); border-bottom: 1px solid var(--border); padding: 76px 0 64px; }
.hero .lead { font-size: 1.18rem; color: var(--muted); max-width: 58ch; margin-bottom: 1.3rem; }
.hero h1 {
  font-size: clamp(2rem, 4.6vw, 3.1rem); font-weight: 700; letter-spacing: -.025em;
  margin-bottom: 1.1rem; max-width: 18ch; color: var(--ink);
}
.hero .byline { color: var(--muted); font-size: .95rem; margin-bottom: 1.8rem; }
.hero .byline strong { color: var(--ink); font-weight: 600; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.waveform { display: none; }

.chip {
  display: inline-flex; align-items: center; gap: .35rem; font-size: .78rem; font-weight: 550;
  padding: .25rem .65rem; border-radius: 6px; border: 1px solid var(--border-str);
  background: var(--bg); color: var(--muted);
}
.chip svg { width: 13px; height: 13px; }
.chip.accent { background: var(--accent-bg); border-color: #cfdcfb; color: var(--accent-700); }

/* ---------- Stat strip ---------- */
.stats { margin-top: 44px; }
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--bg);
}
.stat { text-align: left; padding: 22px 24px; border-right: 1px solid var(--border); }
.stat:last-child { border-right: 0; }
.stat .num { font-size: 1.9rem; font-weight: 700; letter-spacing: -.02em; color: var(--ink); }
.stat .lbl { font-size: .85rem; color: var(--muted); margin-top: 2px; }
@media (max-width: 680px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: 1px solid var(--border); }
}

/* ---------- Sections ---------- */
section { padding: 64px 0; }
.section-head { max-width: var(--maxw-prose); margin-bottom: 36px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head h2 { font-size: clamp(1.45rem, 2.6vw, 1.9rem); margin-bottom: .6rem; font-weight: 650; }
.section-head p { color: var(--muted); font-size: 1.05rem; margin: 0; }
.bg-tint, .alt { background: var(--bg-subtle); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.prose-lead { font-size: 1.1rem; color: var(--ink); }
.prose p, .prose-lead + p { color: var(--text); }

/* ---------- Feature cards ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 880px) { .cards { grid-template-columns: 1fr; } }
.card {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px;
}
.card .ico {
  width: 38px; height: 38px; border-radius: 8px; display: grid; place-items: center; margin-bottom: 14px;
  background: var(--bg-subtle); color: var(--ink); border: 1px solid var(--border);
}
.card .ico svg { width: 20px; height: 20px; }
.card h3 { font-size: 1.08rem; margin-bottom: .4rem; font-weight: 600; }
.card p { color: var(--muted); font-size: .95rem; margin: 0; }

/* ---------- Models pills ---------- */
.pill-grid { display: flex; flex-wrap: wrap; gap: 8px; }
.pill {
  font-family: var(--mono); font-size: .82rem; padding: .35rem .65rem; border-radius: 6px;
  background: var(--bg-subtle); border: 1px solid var(--border); color: var(--text);
}

/* ---------- Methodology steps ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 880px) { .steps { grid-template-columns: 1fr; } }
.step { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.step .n {
  font-family: var(--mono); font-weight: 600; font-size: .8rem; color: var(--accent-700); width: 28px; height: 28px;
  border-radius: 7px; background: var(--accent-bg); border: 1px solid #cfdcfb; display: grid; place-items: center; margin-bottom: 14px;
}
.step h3 { font-size: 1.05rem; margin-bottom: .35rem; font-weight: 600; }
.step p { color: var(--muted); font-size: .93rem; margin: 0; }

/* ---------- Figures ---------- */
.figures { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
@media (max-width: 760px) { .figures { grid-template-columns: 1fr; } }
.figure {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; cursor: zoom-in;
  transition: border-color .15s ease;
}
.figure:hover { border-color: var(--border-str); }
.figure img { width: 100%; height: 250px; object-fit: contain; background: var(--bg); padding: 14px; }
.figure figcaption { padding: 13px 16px; border-top: 1px solid var(--border); font-size: .88rem; color: var(--muted); }
.figure figcaption b { color: var(--ink); font-weight: 600; display: block; margin-bottom: 1px; }

/* lightbox */
.lightbox {
  position: fixed; inset: 0; z-index: 100; background: rgba(20,24,28,.7); display: none;
  align-items: center; justify-content: center; padding: 30px; cursor: zoom-out;
}
.lightbox.open { display: flex; }
.lightbox img { max-width: 92vw; max-height: 88vh; border-radius: 8px; background: #fff; }

/* ---------- Researchers ---------- */
.people { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
@media (max-width: 960px) { .people { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .people { grid-template-columns: 1fr; } }
.person {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px 20px; text-align: center;
}
.avatar {
  width: 76px; height: 76px; border-radius: 50%; margin: 0 auto 14px; object-fit: cover;
  background: var(--bg-sunken); border: 1px solid var(--border);
  display: grid; place-items: center; color: var(--muted); font-weight: 600; font-size: 1.35rem;
}
.person h3 { font-size: 1.02rem; margin-bottom: 2px; font-weight: 600; }
.person .role { font-size: .82rem; font-weight: 550; color: var(--accent-700); margin-bottom: 1px; }
.person .aff { font-size: .8rem; color: var(--muted); margin-bottom: 13px; }
.person .socials { display: flex; justify-content: center; gap: 6px; }
.person .socials a {
  width: 32px; height: 32px; border-radius: 7px; display: grid; place-items: center;
  background: var(--bg); border: 1px solid var(--border); color: var(--muted); transition: color .15s ease, border-color .15s ease;
}
.person .socials a:hover { color: var(--ink); border-color: var(--border-str); text-decoration: none; }
.person .socials svg { width: 16px; height: 16px; }

/* ---------- Citation ---------- */
.cite-wrap { max-width: var(--maxw-prose); margin: 0 auto; }
.cite-box { background: var(--bg-subtle); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); }
.cite-head {
  display: flex; align-items: center; justify-content: space-between; padding: 10px 16px;
  border-bottom: 1px solid var(--border); color: var(--muted); font-size: .82rem; font-family: var(--mono);
}
.cite-copy {
  display: inline-flex; align-items: center; gap: .35rem; background: var(--bg); color: var(--ink);
  border: 1px solid var(--border-str); border-radius: 6px; padding: .3rem .6rem; font-size: .8rem; cursor: pointer; font-weight: 550;
}
.cite-copy:hover { background: var(--bg-sunken); }
.cite-copy svg { width: 13px; height: 13px; }
.cite-box pre { margin: 0; padding: 18px 16px; overflow-x: auto; color: var(--ink); font-family: var(--mono); font-size: .82rem; line-height: 1.65; }
.cite-note { text-align: center; color: var(--muted); font-size: .9rem; margin-top: 12px; }

/* ---------- Footer (light) ---------- */
.footer { background: var(--bg-subtle); color: var(--muted); padding: 48px 0 28px; border-top: 1px solid var(--border); }
.footer-top { display: flex; flex-wrap: wrap; gap: 30px; justify-content: space-between; }
.footer .brand { color: var(--ink); }
.footer .brand .logo { background: var(--ink); }
.footer p { color: var(--muted); max-width: 36ch; font-size: .92rem; margin-top: 10px; }
.footer-links { display: flex; gap: 44px; flex-wrap: wrap; }
.footer-col h4 { color: var(--ink); font-size: .78rem; text-transform: uppercase; letter-spacing: .07em; margin-bottom: 10px; font-weight: 650; }
.footer-col a { display: block; color: var(--muted); font-size: .92rem; padding: 3px 0; }
.footer-col a:hover { color: var(--ink); text-decoration: none; }
.footer-bottom {
  margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--border);
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; align-items: center; color: var(--faint); font-size: .86rem;
}
.footer-bottom .socials { display: flex; gap: 10px; }
.footer-bottom .socials a { color: var(--muted); }
.footer-bottom .socials a:hover { color: var(--ink); }
.footer-bottom .socials svg { width: 18px; height: 18px; }

/* ---------- Page header (sub-pages) ---------- */
.page-head { background: var(--bg-subtle); border-bottom: 1px solid var(--border); padding: 48px 0 40px; }
.page-head .eyebrow { color: var(--accent-700); }
.page-head h1 { font-size: clamp(1.7rem, 3.4vw, 2.3rem); margin-bottom: .5rem; font-weight: 650; }
.page-head p { color: var(--muted); font-size: 1.04rem; max-width: 62ch; margin: 0; }

/* ---------- Toolbar / filters ---------- */
.toolbar {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px;
  display: flex; flex-wrap: wrap; gap: 14px; align-items: flex-end; justify-content: space-between;
  margin-top: 24px;
}
.toolbar .filters { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-size: .72rem; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; color: var(--faint); }
select, .search-input {
  font-family: var(--font); font-size: .92rem; padding: .5rem .7rem; border: 1px solid var(--border-str);
  border-radius: var(--radius-sm); background: var(--bg); color: var(--ink); min-width: 170px; cursor: pointer;
}
select:focus, .search-input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-bg); }
.search-input { cursor: text; }
.btn-reset {
  background: var(--bg); border: 1px solid var(--border-str); color: var(--text); border-radius: var(--radius-sm);
  padding: .5rem .85rem; font-weight: 550; font-size: .88rem; cursor: pointer;
}
.btn-reset:hover { background: var(--bg-subtle); }

.legend { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; font-size: .82rem; color: var(--muted); }
.legend .dot { display: inline-flex; align-items: center; gap: 5px; }
.legend .swatch { width: 12px; height: 12px; border-radius: 3px; border: 1px solid var(--border); }

/* ---------- Benchmark ---------- */
.family-block { margin-bottom: 36px; }
.family-title { font-size: 1.3rem; margin-bottom: 4px; display: flex; align-items: center; gap: 10px; font-weight: 650; }
.family-title .count { font-size: .76rem; font-weight: 550; color: var(--muted); background: var(--bg-subtle); border: 1px solid var(--border); padding: 2px 9px; border-radius: 999px; }
.subfamily-title { font-size: 1rem; color: var(--text); margin: 20px 0 10px; font-weight: 600; }
.lang-card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; }
.lang-card > h4 { font-size: 1.1rem; margin-bottom: 2px; font-weight: 600; }
.lang-card .ds-name { font-size: .92rem; font-weight: 600; color: var(--text); margin: 16px 0 8px; }
.table-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); }
table.bench { width: 100%; border-collapse: collapse; font-size: .9rem; min-width: 540px; }
table.bench th {
  text-align: left; padding: 9px 14px; background: var(--bg-subtle); color: var(--muted);
  font-size: .72rem; text-transform: uppercase; letter-spacing: .04em; font-weight: 600; border-bottom: 1px solid var(--border);
}
table.bench td { padding: 9px 14px; border-bottom: 1px solid var(--border); }
table.bench tr:last-child td { border-bottom: 0; }
table.bench tbody tr:hover { background: var(--bg-subtle); }
table.bench td.model { font-family: var(--mono); font-size: .84rem; color: var(--ink); }
.acc { font-weight: 600; padding: 1px 8px; border-radius: 5px; display: inline-block; min-width: 50px; text-align: center; font-variant-numeric: tabular-nums; }
.acc.good { color: var(--good); background: var(--good-bg); }
.acc.mid { color: var(--mid); background: var(--mid-bg); }
.acc.low { color: var(--low); background: var(--low-bg); }
.best-tag { font-size: .66rem; font-weight: 600; color: var(--accent-700); background: var(--accent-bg); padding: 1px 6px; border-radius: 4px; margin-left: 8px; vertical-align: middle; letter-spacing: .03em; }

/* ---------- Datasets ---------- */
.lang-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.lang-tile {
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px;
  cursor: pointer; transition: border-color .15s ease, background .15s ease; text-align: left;
}
.lang-tile:hover { border-color: var(--border-str); background: var(--bg-subtle); }
.lang-tile.active { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-bg); }
.lang-tile .name { font-weight: 600; font-size: 1rem; color: var(--ink); }
.lang-tile .meta { font-size: .82rem; color: var(--muted); margin-top: 2px; }
.lang-tile .fam { font-size: .7rem; color: var(--accent-700); font-weight: 550; margin-top: 8px; text-transform: uppercase; letter-spacing: .03em; }

.md-panel { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 34px; margin-top: 22px; }
.empty-state { text-align: center; padding: 56px 20px; color: var(--muted); }
.empty-state svg { width: 42px; height: 42px; margin-bottom: 12px; color: var(--faint); }
.spinner { width: 30px; height: 30px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; margin: 30px auto; }
@keyframes spin { to { transform: rotate(360deg); } }

/* markdown body */
.md-body { color: var(--text); font-size: .98rem; }
.md-body h1 { font-size: 1.6rem; margin-bottom: .5rem; font-weight: 650; }
.md-body h2 { font-size: 1.2rem; margin: 1.6rem 0 .6rem; padding-bottom: .35rem; border-bottom: 1px solid var(--border); font-weight: 600; }
.md-body h3 { font-size: 1.05rem; margin: 1.3rem 0 .45rem; font-weight: 600; }
.md-body a { color: var(--accent-700); }
.md-body table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: .88rem; display: block; overflow-x: auto; }
.md-body th, .md-body td { border: 1px solid var(--border); padding: 7px 11px; text-align: left; }
.md-body th { background: var(--bg-subtle); font-weight: 600; }
.md-body code { font-family: var(--mono); font-size: .85em; background: var(--bg-subtle); padding: .12em .4em; border-radius: 4px; }
.md-body pre { background: var(--bg-subtle); color: var(--ink); padding: 15px; border-radius: var(--radius-sm); overflow-x: auto; border: 1px solid var(--border); }
.md-body pre code { background: none; padding: 0; color: inherit; }
.md-body blockquote { border-left: 3px solid var(--border-str); padding: .3rem 1rem; margin: 1rem 0; background: var(--bg-subtle); border-radius: 0 6px 6px 0; color: var(--muted); }
.md-body img { border-radius: 8px; margin: 1rem 0; }
.md-body ul, .md-body ol { padding-left: 1.4rem; }

/* subtle reveal — low motion */
.reveal { opacity: 0; transition: opacity .4s ease; }
.reveal.in { opacity: 1; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transition: none; } }

.note-banner {
  background: var(--bg-subtle); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 11px 15px;
  font-size: .9rem; color: var(--text); margin-bottom: 16px; display: flex; gap: 9px; align-items: flex-start;
}
.note-banner svg { width: 17px; height: 17px; color: var(--muted); flex-shrink: 0; margin-top: 2px; }

/* ---------- FAQ ---------- */
.faq { max-width: var(--maxw-prose); }
.faq details { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 10px; background: var(--bg); }
.faq summary {
  cursor: pointer; padding: 16px 18px; font-weight: 600; color: var(--ink); font-size: 1rem;
  list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; font-size: 1.3rem; font-weight: 400; color: var(--muted); line-height: 1; transition: transform .15s ease;
}
.faq details[open] summary::after { content: "\2212"; }
.faq summary:hover { color: var(--accent-700); }
.faq details p { margin: 0; padding: 0 18px 16px; color: var(--text); font-size: .96rem; }