:root,[data-theme="paper"]{
  --bg:#F4EFE5;--surface:#FCFAF6;--panel:#FFFFFF;--panel-2:#F7F4EE;
  --text:#171512;--text-2:#4E4941;--muted:#7F766B;
  --border:rgba(26,22,17,.12);--border-strong:rgba(26,22,17,.22);
  --accent:#9A7730;--accent-2:#2563EB;--green:#16803D;--red:#B42318;--purple:#6D28D9;
  --shadow:0 1px 2px rgba(20,16,10,.05),0 8px 24px rgba(20,16,10,.06);
  --radius:8px;--nav-h:62px;
}
[data-theme="gray"]{
  --bg:#ECEDEF;--surface:#FAFAFA;--panel:#FFFFFF;--panel-2:#F4F5F7;
  --text:#171717;--text-2:#454545;--muted:#727272;
  --border:rgba(0,0,0,.12);--border-strong:rgba(0,0,0,.22);
}
[data-theme="dark"]{
  color-scheme:dark;
  --bg:#10100E;--surface:#171613;--panel:#1D1B17;--panel-2:#252119;
  --text:#F4EFE5;--text-2:#D9D0C2;--muted:#9A9184;
  --border:rgba(255,255,255,.1);--border-strong:rgba(255,255,255,.2);
  --accent:#D3A85B;--accent-2:#79A7FF;--green:#42D77D;--red:#F87171;--purple:#B696FF;
  --shadow:0 12px 32px rgba(0,0,0,.28);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Plus Jakarta Sans','Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;background:var(--bg);color:var(--text);line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.site-nav{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(18px);border-bottom:1px solid var(--border)}
.nav-inner{height:var(--nav-h);max-width:1240px;margin:0 auto;padding:0 22px;display:flex;align-items:center;gap:16px}
.brand{font-weight:850;letter-spacing:.08em;color:var(--accent);white-space:nowrap}
.nav-links{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;flex:1}
.nav-links::-webkit-scrollbar{display:none}
.nav-links a{padding:7px 11px;border-radius:999px;color:var(--muted);font-size:.78rem;font-weight:650;white-space:nowrap;border:1px solid transparent}
.nav-links a:hover,.nav-links a.active{color:var(--text);background:var(--panel-2);border-color:var(--border)}
.controls{display:flex;gap:6px;align-items:center}
.theme-dot{width:22px;height:22px;border-radius:50%;border:1px solid var(--border-strong);cursor:pointer}
.theme-dot.active{outline:2px solid var(--accent);outline-offset:2px}
.lang-btn{border:1px solid var(--border);background:var(--panel);color:var(--muted);padding:5px 9px;border-radius:999px;font-size:.7rem;font-weight:800;cursor:pointer}
.lang-btn.active{color:var(--text);border-color:var(--border-strong)}
.wrap{max-width:1240px;margin:0 auto;padding:0 22px}
.hero{padding:76px 0 44px;border-bottom:1px solid var(--border)}
.eyebrow{font-size:.72rem;text-transform:uppercase;letter-spacing:.16em;color:var(--accent);font-weight:850;margin-bottom:12px}
h1{font-size:clamp(2.6rem,6vw,5.6rem);line-height:.95;letter-spacing:0;font-weight:900;max-width:960px}
.lead{max-width:850px;color:var(--text-2);font-size:1.02rem;margin-top:22px}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:8px 14px;border-radius:var(--radius);font-size:.82rem;font-weight:800;border:1px solid var(--border);background:var(--panel);color:var(--text)}
.btn.primary{background:var(--text);color:var(--bg);border-color:var(--text)}
.section{padding:42px 0;border-bottom:1px solid var(--border)}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:18px}
.section-head h2{font-size:1.35rem;line-height:1.2}
.section-note{font-size:.84rem;color:var(--muted);max-width:600px}
.pillar-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}
.content-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.feature-card,.topic-card,.stat-panel{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.feature-card{padding:18px;min-height:170px;display:flex;flex-direction:column}
.feature-card .num{font-size:.72rem;color:var(--accent);font-weight:850;margin-bottom:20px}
.feature-card h3,.topic-card h3{font-size:1rem;line-height:1.35;margin-bottom:8px}
.feature-card p,.topic-card p{font-size:.84rem;color:var(--text-2)}
.feature-card .card-link{margin-top:auto;color:var(--accent);font-weight:850;font-size:.78rem;padding-top:16px}
.topic-card{padding:18px;display:flex;flex-direction:column;min-height:238px}
.topic-card .body{flex:1}
.evidence{display:flex;gap:6px;flex-wrap:wrap;margin-top:16px}
.evidence a{font-size:.7rem;font-weight:800;color:var(--accent);border:1px solid var(--border);background:var(--panel-2);border-radius:999px;padding:4px 8px}
.home-band{display:grid;grid-template-columns:1.2fr .8fr;gap:12px;align-items:stretch}
.stat-panel{padding:20px}
.stat-number{font-size:2.2rem;font-weight:900;color:var(--accent);line-height:1}
.stat-label{margin-top:6px;color:var(--muted);font-size:.78rem;font-weight:800;text-transform:uppercase;letter-spacing:.1em}
.library-panel{padding:22px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--radius)}
.library-panel h2{font-size:1.2rem;margin-bottom:8px}
.library-panel p{color:var(--text-2);font-size:.9rem}
.page-layout{display:grid;grid-template-columns:270px 1fr;gap:28px}
.side-index{position:sticky;top:86px;align-self:start;border:1px solid var(--border);border-radius:var(--radius);background:var(--panel);padding:12px}
.side-index a{display:block;padding:8px 10px;border-radius:6px;color:var(--muted);font-size:.8rem;font-weight:750}
.side-index a:hover{background:var(--panel-2);color:var(--text)}
.footer{padding:34px 0;color:var(--muted);font-size:.78rem}
@media(max-width:980px){
  .pillar-grid,.content-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .home-band,.page-layout{grid-template-columns:1fr}
  .side-index{position:static}
}
@media(max-width:640px){
  .nav-inner{padding:0 12px;gap:8px}
  .brand{font-size:.78rem}
  .controls{gap:4px}
  .theme-dot{width:18px;height:18px}
  .lang-btn{padding:4px 7px}
  .wrap{padding:0 14px}
  .hero{padding:52px 0 32px}
  .pillar-grid,.content-grid{grid-template-columns:1fr}
  .section-head{display:block}
  .feature-card,.topic-card{min-height:0}
}

/* MQKLW v2 integration: warm paper, terminal, pixel directory language. */
@font-face {
  font-family: "Ark Pixel";
  src: url("/assets/fonts/ark-pixel-12px-zh.woff2") format("woff2");
  font-display: swap;
  font-style: normal;
  font-weight: 400;
  unicode-range: U+3000-303F, U+4E00-9FFF, U+3400-4DBF, U+F900-FAFF, U+FF00-FFEF, U+2E80-2EFF;
}

:root,
[data-theme="paper"] {
  --bg: #FAF8F3;
  --surface: #FAF8F3;
  --panel: #FFFCF5;
  --panel-2: #F4EFE5;
  --text: #1A1814;
  --text-2: #2D2924;
  --muted: #6B6358;
  --quiet: #A89E8E;
  --border: #D9D1C0;
  --border-strong: #C9BFAE;
  --accent: #8B5A3B;
  --accent-2: #6F4730;
  --green: #5A7D5A;
  --red: #B5462C;
  --shadow: 2px 2px 0 rgba(26, 24, 20, 0.08);
  --radius: 6px;
  --nav-h: 58px;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --pixel: "VT323", "Ark Pixel", "IBM Plex Mono", ui-monospace, monospace;
  --serif: "Fraunces", Georgia, serif;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  letter-spacing: 0;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.1 0 0 0 0 0.09 0 0 0 0 0.08 0 0 0 0.055 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  opacity: 0.45;
  mix-blend-mode: multiply;
  z-index: -1;
}

body,
.brand,
.root-link,
.nav-links a,
.eyebrow,
h1,
h2,
h3,
.btn,
.stat-label,
.section-note,
.footer {
  letter-spacing: 0;
}

.site-nav {
  background: rgba(250, 248, 243, 0.93);
  border-bottom: 1px dashed var(--border);
  backdrop-filter: blur(16px);
}

.nav-inner {
  max-width: 1180px;
  padding: 0 24px;
}

.root-link {
  color: var(--muted);
  font-family: var(--pixel);
  font-size: 20px;
  line-height: 1;
  white-space: nowrap;
}

.root-link::before {
  content: "▮ ";
  color: var(--accent);
  font-size: 13px;
  vertical-align: 2px;
}

.brand {
  color: var(--text);
  font-family: var(--pixel);
  font-size: 20px;
  font-weight: 400;
}

.nav-links a,
.lang-btn,
.theme-dot {
  border-radius: 2px;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--panel-2);
  border-color: var(--border);
}

.theme-dot {
  box-shadow: inset 0 1px 0 rgba(255,255,255,.65), 2px 2px 0 rgba(26,24,20,.12);
}

.theme-dot.active {
  outline: 1px solid var(--accent);
  outline-offset: 2px;
}

.wrap {
  max-width: 1180px;
}

.hero {
  padding: 62px 0 40px;
  border-bottom: 1px dashed var(--border);
}

.eyebrow {
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

h1 {
  max-width: 720px;
  font-family: var(--pixel);
  font-size: 48px;
  line-height: 0.95;
  font-weight: 400;
}

.lead {
  max-width: 760px;
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.85;
}

.btn,
.evidence a {
  border-radius: 2px;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.72), 2px 2px 0 rgba(26,24,20,.14);
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent-2);
  color: var(--bg);
}

.btn:hover,
.feature-card .card-link:hover,
.evidence a:hover {
  transform: translateY(-1px);
}

.section {
  border-bottom: 1px dashed var(--border);
}

.section-head h2,
.library-panel h2,
.feature-card h3,
.topic-card h3 {
  font-family: var(--pixel);
  font-weight: 400;
}

.feature-card,
.topic-card,
.stat-panel,
.library-panel,
.side-index {
  border-color: var(--border);
  border-radius: 6px;
  box-shadow: 2px 2px 0 rgba(26,24,20,.08);
}

.feature-card .num,
.feature-card .card-link,
.stat-number,
.evidence a {
  color: var(--accent);
}

.evidence a {
  background: var(--panel-2);
}

.footer {
  color: var(--quiet);
  border-top: 1px dashed var(--border);
}

@media (max-width: 640px) {
  .nav-inner {
    align-items: flex-start;
    height: auto;
    min-height: var(--nav-h);
    padding: 12px 14px;
    flex-wrap: wrap;
  }

  .root-link,
  .brand {
    font-size: 19px;
  }

  .nav-links {
    order: 3;
    width: 100%;
  }

  h1 {
    font-size: 36px;
  }
}