:root {
  color-scheme: dark;
  --bg: #08111a;
  --bg-soft: #0d1721;
  --surface: #101c28;
  --surface-2: #132331;
  --text: #eef7fb;
  --muted: #93a9b8;
  --line: rgba(157, 201, 226, .16);
  --line-strong: rgba(157, 201, 226, .28);
  --accent: #7bd0ff;
  --accent-2: #9ce6cf;
  --accent-soft: rgba(123, 208, 255, .12);
  --shadow: 0 18px 50px rgba(0,0,0,.24);
  --radius: 22px;
  --max: 1180px;
  --header-h: 74px;
}
html[data-theme="light"] {
  color-scheme: light;
  --bg: #f3f8fb;
  --bg-soft: #ffffff;
  --surface: #ffffff;
  --surface-2: #eaf3f8;
  --text: #10202c;
  --muted: #597080;
  --line: rgba(27, 72, 101, .13);
  --line-strong: rgba(27, 72, 101, .23);
  --accent: #0f78ad;
  --accent-2: #187b68;
  --accent-soft: rgba(15, 120, 173, .09);
  --shadow: 0 18px 45px rgba(30,68,91,.10);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 82% -5%, rgba(123,208,255,.10), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}
a { color: inherit; }
button, input { font: inherit; }
button { color: inherit; }
.skip-link {
  position: absolute; left: -999px; top: 10px; z-index: 100;
  background: var(--accent); color: #071017; padding: .7rem 1rem; border-radius: 10px;
}
.skip-link:focus { left: 10px; }
.site-header {
  position: sticky; top: 0; z-index: 50;
  min-height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: var(--max); margin: 0 auto; min-height: var(--header-h);
  padding: 0 22px; display: flex; align-items: center; gap: 18px;
}
.brand {
  display: inline-flex; align-items: center; gap: 11px; min-width: 0; text-decoration: none;
}
.brand-mark { width: 38px; height: 38px; color: var(--accent); flex: 0 0 auto; }
.brand-copy { display: grid; line-height: 1.05; }
.brand-copy strong { font-size: .98rem; letter-spacing: .02em; }
.brand-copy span { color: var(--muted); font-size: .72rem; margin-top: 5px; letter-spacing: .025em; }
.header-spacer { flex: 1; }
.header-link {
  display: none; text-decoration: none; color: var(--muted); font-size: .82rem;
}
.icon-btn {
  width: 42px; height: 42px; border: 1px solid var(--line);
  background: var(--surface); border-radius: 13px; display: grid; place-items: center;
  cursor: pointer;
}
.icon-btn:hover { border-color: var(--line-strong); background: var(--surface-2); }
.icon-btn svg { width: 20px; height: 20px; }
.menu-panel {
  display: none; position: fixed; z-index: 60; inset: var(--header-h) 0 auto 0;
  background: color-mix(in srgb, var(--bg-soft) 96%, transparent);
  border-bottom: 1px solid var(--line); box-shadow: var(--shadow);
}
.menu-panel.open { display: block; }
.menu-inner {
  max-width: var(--max); margin: 0 auto; padding: 24px 22px 30px;
  display: grid; gap: 18px;
}
.menu-head { display:flex; align-items:center; justify-content:space-between; gap:16px; }
.menu-head small { color: var(--muted); }
.menu-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:9px; }
.menu-module {
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 14px;
  color: var(--muted); background: var(--surface); font-size: .82rem;
}
.menu-module b { color: var(--text); margin-right: .45rem; }
.menu-module.active {
  background: var(--accent-soft);
  border-color: var(--line-strong);
  color: var(--text);
}
.menu-module.active b { color: var(--accent); }

main { overflow: clip; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 22px; }
.hero { padding: 86px 0 55px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; color: var(--accent);
  text-transform: uppercase; letter-spacing: .13em; font-weight: 700; font-size: .72rem;
}
.eyebrow::before { content:""; width: 26px; height: 1px; background: currentColor; }
.hero-grid { display: grid; gap: 42px; align-items: center; }
.hero h1 {
  margin: 18px 0 22px; font-size: clamp(3.15rem, 8vw, 6.8rem);
  line-height: .91; letter-spacing: -.065em; max-width: 850px; font-weight: 720;
}
.hero h1 span { color: var(--accent); }
.lead { max-width: 710px; font-size: clamp(1.02rem, 2vw, 1.25rem); color: var(--muted); margin: 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 27px; }
.btn {
  display: inline-flex; align-items:center; gap:9px; min-height: 44px;
  border-radius: 13px; padding: 0 16px; border: 1px solid var(--line);
  text-decoration: none; font-weight: 650; font-size:.88rem; cursor:pointer;
  background: var(--surface); color:var(--text);
}
.btn.primary { background: var(--accent); color: #071018; border-color: transparent; }
.btn:hover { transform: translateY(-1px); }
.hero-art {
  min-height: 360px; border: 1px solid var(--line); border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(123,208,255,.07), transparent 48%),
    #0d1721;
  padding: 18px; position: relative; overflow: hidden;
}
.hero-art img { display:block; width:100%; height:100%; min-height:330px; object-fit:contain; color: var(--text); }
.hero-art-note {
  position:absolute; right:18px; bottom:15px; padding:.45rem .65rem;
  font-size:.68rem; color:var(--muted); background:color-mix(in srgb,var(--bg-soft) 84%,transparent);
  border:1px solid var(--line); border-radius:10px;
}

.metrics {
  display:grid; grid-template-columns:repeat(2,minmax(0,1fr));
  border:1px solid var(--line); border-radius:var(--radius); overflow:hidden;
  background:var(--surface); margin-top: 38px;
}
.metric { padding:18px; min-height:91px; border-right:1px solid var(--line); border-bottom:1px solid var(--line); }
.metric:nth-child(2n){border-right:0}
.metric:nth-last-child(-n+2){border-bottom:0}
.metric strong { display:block; font-size:1.55rem; letter-spacing:-.04em; }
.metric span { display:block; color:var(--muted); font-size:.72rem; text-transform:uppercase; letter-spacing:.08em; margin-top:4px; }

.system-strip { border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.system-flow {
  padding: 19px 0; display:flex; flex-wrap:wrap; align-items:center; gap:9px;
  color:var(--muted); font-size:.78rem;
}
.system-flow b { color:var(--text); font-weight:650; }
.arrow { color:var(--accent); opacity:.8; }

.section { padding: 78px 0; }
.section + .section { border-top:1px solid var(--line); }
.section-head {
  display:grid; gap:13px; margin-bottom:30px; max-width:820px;
}
.kicker { color:var(--accent); text-transform:uppercase; letter-spacing:.12em; font-size:.7rem; font-weight:700; }
.section h2 { margin:0; font-size:clamp(2rem,5vw,3.8rem); line-height:1; letter-spacing:-.045em; }
.section-head p { color:var(--muted); margin:0; max-width:720px; }

.module-grid { display:grid; gap:12px; }
.module-card {
  position:relative; display:grid; grid-template-columns:58px 1fr auto; gap:16px; align-items:start;
  border:1px solid var(--line); border-radius:18px; padding:20px;
  background:linear-gradient(145deg,var(--surface),color-mix(in srgb,var(--surface) 90%,var(--accent-soft)));
}
.module-card:hover { border-color:var(--line-strong); }
.module-num {
  width:48px; height:48px; border-radius:14px; background:var(--accent-soft);
  color:var(--accent); display:grid; place-items:center; font-weight:800; font-size:.85rem;
}
.module-card h3 { margin:1px 0 6px; font-size:1.05rem; }
.module-card p { margin:0; color:var(--muted); font-size:.82rem; }
.module-meta {
  display:none; color:var(--muted); font-size:.68rem; text-transform:uppercase; letter-spacing:.08em;
  text-align:right; white-space:nowrap;
}
.badge {
  display:inline-flex; margin-top:10px; align-items:center; padding:.28rem .48rem;
  border-radius:8px; background:var(--accent-soft); color:var(--accent);
  font-size:.64rem; font-weight:700; text-transform:uppercase; letter-spacing:.06em;
}

.labs-grid { display:grid; gap:18px; }
.lab-demo, .lab-list {
  border:1px solid var(--line); border-radius:var(--radius); background:var(--surface); padding:22px;
}
.lab-demo h3, .lab-list h3 { margin:0 0 8px; }
.lab-demo > p, .lab-list > p { color:var(--muted); font-size:.85rem; margin:0 0 20px; }
.lab-control { display:grid; gap:9px; margin-bottom:17px; }
.lab-control label { display:flex; justify-content:space-between; gap:12px; font-size:.8rem; }
.lab-control output { color:var(--accent); font-variant-numeric:tabular-nums; }
input[type="range"] { width:100%; accent-color:var(--accent); }
.lab-readouts { display:grid; grid-template-columns:repeat(3,1fr); gap:8px; margin-top:16px; }
.readout { border:1px solid var(--line); background:var(--bg-soft); border-radius:13px; padding:12px; }
.readout strong { display:block; font-size:1.06rem; font-variant-numeric:tabular-nums; }
.readout span { color:var(--muted); font-size:.65rem; }
.profile {
  width:100%; height:190px; display:block; border:1px solid var(--line); border-radius:14px;
  background:var(--bg-soft);
}
.profile-grid { stroke:var(--line); stroke-width:1; }
.profile-curve { fill:none; stroke:var(--accent); stroke-width:3; stroke-linecap:round; stroke-linejoin:round; }
.profile-dot { fill:var(--accent-2); stroke:var(--bg-soft); stroke-width:3; }

.lab-tags { display:flex; flex-wrap:wrap; gap:8px; }
.lab-tag {
  border:1px solid var(--line); border-radius:999px; padding:.5rem .68rem;
  color:var(--muted); font-size:.74rem;
}

.pwa {
  display:grid; gap:22px; border:1px solid var(--line); border-radius:26px; padding:26px;
  background:
    radial-gradient(circle at 100% 0, rgba(123,208,255,.10), transparent 24rem),
    var(--surface);
}
.pwa h2 { font-size:clamp(2rem,5vw,3.2rem); }
.pwa-status { display:flex; align-items:center; gap:9px; color:var(--muted); font-size:.82rem; }
.dot { width:8px; height:8px; border-radius:50%; background:var(--accent-2); box-shadow:0 0 0 5px color-mix(in srgb,var(--accent-2) 14%,transparent); }

.site-footer { border-top:1px solid var(--line); margin-top:78px; }
.footer-inner {
  max-width:var(--max); margin:0 auto; padding:31px 22px 38px;
  display:grid; gap:18px; color:var(--muted); font-size:.76rem;
}
.footer-brand { display:flex; align-items:center; gap:10px; color:var(--text); }
.footer-brand img { width:29px; height:29px; color:var(--accent); }
.footer-links { display:flex; flex-wrap:wrap; gap:14px; }
.footer-links a { color:var(--muted); text-decoration:none; }
.footer-links a:hover { color:var(--text); }

@media (min-width: 720px) {
  .header-link { display:inline; }
  .menu-grid { grid-template-columns:repeat(3,minmax(0,1fr)); }
  .hero { padding-top:105px; }
  .metrics { grid-template-columns:repeat(4,1fr); }
  .metric { border-bottom:0; }
  .metric:nth-child(2n){border-right:1px solid var(--line)}
  .metric:last-child{border-right:0}
  .module-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .module-meta { display:block; }
  .labs-grid { grid-template-columns:minmax(0,1.15fr) minmax(280px,.85fr); }
  .pwa { grid-template-columns:1.25fr .75fr; align-items:end; padding:34px; }
  .footer-inner { grid-template-columns:1fr auto; align-items:center; }
  .footer-links { justify-content:flex-end; }
}
@media (min-width: 980px) {
  .hero-grid { grid-template-columns:minmax(0,1.05fr) minmax(400px,.95fr); }
  .hero h1 { font-size:clamp(4.5rem,7vw,7rem); }
  .hero-art { min-height:480px; }
  .hero-art img { min-height:440px; }
  .module-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .menu-grid { grid-template-columns:repeat(5,minmax(0,1fr)); }
}
@media (prefers-reduced-motion:no-preference) {
  .btn,.module-card,.icon-btn { transition: transform .18s ease, border-color .18s ease, background .18s ease; }
}

.menu-module { text-decoration: none; }

.menu-panel {
  max-height: calc(100dvh - var(--header-h));
  overflow-y: auto;
  overflow-x: hidden;
}
.menu-section + .menu-section {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.menu-section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 10px;
}
.menu-section-head strong {
  font-size: .78rem;
}
.menu-section-head small {
  color: var(--muted);
  font-size: .68rem;
}
.chapter-menu-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 8px;
}
.menu-chapter {
  min-width: 0;
  min-height: 42px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--muted);
  text-decoration: none;
  font-size: .72rem;
  line-height: 1.15;
}
.menu-chapter b {
  flex: 0 0 auto;
  color: var(--text);
  font-size: .66rem;
  letter-spacing: .06em;
}
.menu-chapter.active {
  background: var(--accent-soft);
  border-color: var(--line-strong);
  color: var(--text);
}
.menu-chapter.active b { color: var(--accent); }
.menu-chapter.disabled { opacity: .48; }

@media (min-width:720px) {
  .chapter-menu-grid {
    grid-template-columns: repeat(5, minmax(0,1fr));
  }
}