/* ============================================================================
   KlusAI Research — brand styles, mirroring klusai.com / klusai-webos brand v1.1
   Familjen Grotesk (display) + Inter (body) · Mist neutrals · Klusai Blue (links)
   · Research Teal (accent) · Coral (CTA) · pill buttons, cards, eyebrows.
   ============================================================================ */

/* ---- Fonts (self-hosted woff2 from the brand kit) ---- */
@font-face {
  font-family: "Familjen Grotesk";
  src: url("/assets/fonts/FamiljenGrotesk-SemiBold.woff2") format("woff2");
  font-weight: 600; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Inter";
  src: url("/assets/fonts/Inter-Regular.woff2") format("woff2");
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: "Inter";
  src: url("/assets/fonts/Inter-Medium.woff2") format("woff2");
  font-weight: 500; font-style: normal; font-display: swap;
}

/* ---- Tokens ---- */
:root {
  --font-display: "Familjen Grotesk", system-ui, sans-serif;
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;

  /* Mist neutrals (cool-toned; never generic grays) */
  --mist-50:  oklch(98.7% 0.002 197.1);
  --mist-100: oklch(96.3% 0.002 197.1);
  --mist-200: oklch(92.5% 0.005 214.3);
  --mist-300: oklch(87.2% 0.007 219.6);
  --mist-400: oklch(72.3% 0.014 214.4);
  --mist-500: oklch(56%   0.021 213.5);
  --mist-600: oklch(45%   0.017 213.2);
  --mist-700: oklch(37.8% 0.015 216);
  --mist-800: oklch(27.5% 0.011 216.9);
  --mist-900: oklch(21.8% 0.008 223.9);
  --mist-950: oklch(14.8% 0.004 228.8);

  /* Brand accents — authoritative hex from the guidelines */
  --klusai-50:  #EFF6FF;
  --klusai-400: #60A5FA;
  --klusai-500: #488EFF;  /* logo blue */
  --klusai-600: #3B82F6;
  --klusai-700: #2563EB;

  --research-50:  #F0FDFA;
  --research-100: #CCFBF1;
  --research-400: #2DD4BF;
  --research-500: #14B8A6;  /* research teal */
  --research-600: #0D9488;
  --research-700: #0F766E;

  --coral-400: #FB923C;
  --coral-500: #F97316;     /* CTA orange */
  --coral-600: #EA580C;

  /* Semantic (light) */
  --bg: var(--mist-50);
  --surface: #fff;
  --surface-alt: var(--mist-100);
  --text: var(--mist-950);
  --text-secondary: var(--mist-600);
  --border: var(--mist-200);
  --link: var(--klusai-600);
  --accent: var(--research-600);
  --accent-soft-bg: var(--research-100);
  --accent-soft-text: var(--research-700);
  --cta: var(--coral-500);
  --cta-hover: var(--coral-600);
  --shadow: 0 1px 2px rgba(2, 6, 23, 0.04), 0 4px 12px rgba(2, 6, 23, 0.05);
  --header-bg: rgba(248, 250, 252, 0.8);
  --nav-link: var(--mist-800);
  --nav-cta-bg: var(--klusai-50);
  --nav-cta-text: var(--klusai-600);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--mist-950);
    --surface: var(--mist-900);
    --surface-alt: var(--mist-800);
    --text: #fff;
    --text-secondary: var(--mist-400);
    --border: var(--mist-800);
    --link: var(--klusai-400);
    --accent: var(--research-400);
    --accent-soft-bg: color-mix(in oklab, var(--research-500) 24%, transparent);
    --accent-soft-text: var(--research-400);
    --cta: var(--coral-500);
    --cta-hover: var(--coral-400);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.3);
    --header-bg: rgba(2, 6, 23, 0.6);
    --nav-link: var(--mist-300);
    --nav-cta-bg: color-mix(in oklab, var(--klusai-500) 22%, transparent);
    --nav-cta-text: var(--klusai-400);
  }
}

/* ---- Base ---- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 1.5rem; }
.wrap.narrow { max-width: 760px; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600; line-height: 1.15;
  color: var(--text);
  margin: 2rem 0 0.75rem; letter-spacing: -0.015em;
}
h1 { font-size: 2.2rem; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.2rem; }
p, ul, ol { margin: 0 0 1rem; }
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
strong { font-weight: 500; }
em { font-style: italic; }
code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 0.85em; background: var(--surface-alt);
  padding: 0.12em 0.38em; border-radius: 5px;
}
hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; }

/* ---- Header / nav ---- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: var(--header-bg);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-row {
  position: relative;
  display: flex; align-items: center; gap: 1rem; height: 72px;
}
.brand-lockup { flex: 0 0 auto; display: inline-flex; align-items: center; gap: 0.1rem; }
/* wrapper is transparent on desktop so its children act as direct flex items */
.nav-menu { display: contents; }
.nav-toggle {
  display: none; margin-left: auto; flex: 0 0 auto;
  width: 42px; height: 42px; padding: 0; cursor: pointer;
  align-items: center; justify-content: center;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 11px;
}
.nav-toggle .i-close { display: none; }
.nav-row.open .nav-toggle .i-bars { display: none; }
.nav-row.open .nav-toggle .i-close { display: block; }
.brand-lockup:hover { text-decoration: none; }
.brand-lockup img { height: 26px; width: auto; }
/* qualified with img to beat `.brand-lockup img` specificity */
.brand-lockup img.logo-light { display: block; }
.brand-lockup img.logo-dark  { display: none; }
@media (prefers-color-scheme: dark) {
  .brand-lockup img.logo-light { display: none; }
  .brand-lockup img.logo-dark  { display: block; }
}
.brand-sub {
  font-family: var(--font-display); font-weight: 600; font-size: 0.95rem;
  color: var(--accent); margin-left: 0.6rem; padding-left: 0.6rem;
  border-left: 1px solid var(--border);
}
.site-nav {
  flex: 1 1 auto; display: flex; align-items: center;
  justify-content: center; gap: 1.7rem;
}
.site-nav a { font-weight: 500; font-size: 0.94rem; color: var(--nav-link); }
.site-nav a:hover { color: var(--accent); text-decoration: none; }
.nav-right { flex: 0 0 auto; }
.nav-cta.btn {
  padding: 0.5rem 1rem; background: var(--nav-cta-bg);
  color: var(--nav-cta-text); border-color: transparent;
}
.nav-cta.btn:hover { filter: brightness(0.97); }

@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .nav-menu {
    display: none; position: absolute; top: calc(100% + 1px); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--surface); border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow); padding: 0.4rem 0;
  }
  .nav-row.open .nav-menu { display: flex; }
  .nav-menu .site-nav {
    flex: initial; flex-direction: column; align-items: stretch;
    justify-content: flex-start; gap: 0;
  }
  .nav-menu .site-nav a {
    padding: 0.85rem 1.5rem; font-size: 1rem;
    border-top: 1px solid var(--border);
  }
  .nav-menu .site-nav a:first-child { border-top: none; }
  .nav-menu .nav-right { padding: 0.9rem 1.5rem 0.6rem; }
  .nav-menu .nav-cta.btn { width: 100%; justify-content: center; }

  .wrap { padding: 0 1.15rem; }
  .hero { padding: 2.75rem 0 2rem; }
  .hero .lead { font-size: 1.08rem; }
  .section { padding: 2rem 0; }
  body { font-size: 16px; }
  .card { padding: 1.15rem 1.2rem; }
}

/* ---- Buttons (pill) ---- */
.btn {
  display: inline-flex; align-items: center; gap: 0.45rem;
  border-radius: 999px; font-family: var(--font-sans);
  font-weight: 500; font-size: 0.95rem; line-height: 1;
  padding: 0.68rem 1.3rem; border: 1px solid transparent;
  cursor: pointer; transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--cta); color: #fff; }
.btn-primary:hover { background: var(--cta-hover); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--surface-alt); }
.btn-accent { background: var(--accent-soft-bg); color: var(--accent-soft-text); }
.nav-cta.btn { padding: 0.5rem 1rem; }

/* ---- Eyebrow + badge ---- */
.eyebrow {
  font-family: var(--font-display); font-weight: 600; font-size: 0.78rem;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent);
  margin: 0 0 0.4rem;
}
.badge {
  display: inline-block; border-radius: 999px;
  background: var(--accent-soft-bg); color: var(--accent-soft-text);
  padding: 0.38rem 0.95rem; font-weight: 500; font-size: 0.88rem;
}

/* ---- Layout sections ---- */
main { display: block; }
.hero {
  text-align: center; padding: 4.5rem 0 3rem;
  background: radial-gradient(115% 80% at 50% -20%,
    color-mix(in oklab, var(--accent) 10%, transparent), transparent 65%);
}
.hero h1 { font-size: clamp(2.3rem, 5.2vw, 3.3rem); margin: 0.9rem 0 0; }
.hero .lead {
  font-size: 1.18rem; line-height: 1.6; color: var(--text-secondary);
  max-width: 660px; margin: 1.1rem auto 1.7rem;
}
.hero .cta-row { display: flex; gap: 0.7rem; justify-content: center; flex-wrap: wrap; }
.accent-word { color: var(--accent); }
.section { padding: 2.75rem 0; border-top: 1px solid var(--border); }
.section .section-head { margin-bottom: 1.4rem; }
.section .section-head h2 { margin: 0.15rem 0 0; }
.page-pad { padding: 2.5rem 0 1rem; }

/* ---- Cards ---- */
.card-grid { display: grid; gap: 1rem; }
.card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 820px) { .card-grid.cols-3 { grid-template-columns: 1fr; } }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 16px; padding: 1.4rem 1.5rem; box-shadow: var(--shadow);
  display: flex; gap: 1.1rem; align-items: flex-start;
}
.card .icon-tile {
  flex: none; width: 46px; height: 46px; border-radius: 12px;
  background: var(--accent-soft-bg); color: var(--accent-soft-text);
  font-family: var(--font-display); font-weight: 600; font-size: 0.95rem;
  display: flex; align-items: center; justify-content: center;
}
.card h3 { margin: 0.05rem 0 0.35rem; font-size: 1.1rem; }
.card p { margin: 0 0 0.75rem; color: var(--text-secondary); font-size: 0.96rem; }
.chip-row { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.chip {
  display: inline-flex; align-items: center; gap: 0.3rem;
  border-radius: 999px; padding: 0.28rem 0.75rem;
  font-size: 0.8rem; font-weight: 500;
}
.chip:hover { text-decoration: none; }
.chip-accent { background: var(--accent-soft-bg); color: var(--accent-soft-text); }
.chip-muted { background: var(--surface-alt); color: var(--text-secondary); }

/* ---- Tables ---- */
.table-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 16px; box-shadow: var(--shadow);
  padding: 0.25rem 1.25rem 0.75rem; overflow-x: auto; margin: 1rem 0;
}
table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
table th, table td { padding: 0.55rem 0.65rem; border-bottom: 1px solid var(--border); text-align: left; }
table thead th { border-bottom: 2px solid var(--border); }
.table-card table { margin: 0; }

/* ---- Posts ---- */
.post-list { list-style: none; padding: 0; }
.post-list li { margin-bottom: 1.6rem; }
.post-list h3 { margin: 0.1rem 0 0.25rem; }
.post-meta { color: var(--text-secondary); font-size: 0.88rem; }

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--border); color: var(--text-secondary);
  font-size: 0.86rem; padding: 2.5rem 0; margin-top: 1rem;
}
.site-footer a { color: var(--text-secondary); }
.site-footer .foot-tag { margin-top: 0.4rem; color: var(--accent); font-weight: 500; }

/* ---- Leaderboard table ---- */
table.lb { font-size: 0.9rem; }
table.lb th, table.lb td { text-align: right; }
table.lb th:nth-child(-n+4), table.lb td:nth-child(-n+4) { text-align: left; }
table.lb thead th { white-space: nowrap; cursor: pointer; }
table.lb th[data-asc="true"]::after  { content: " \25B2"; color: var(--accent); }
table.lb th[data-asc="false"]::after { content: " \25BC"; color: var(--accent); }
table.lb td.f1, table.lb th.f1 { font-weight: 600; color: var(--accent); }
.lb-meta { font-size: 0.8rem; color: var(--text-secondary); }