:root{
  color-scheme:dark;
  --bg:#070a10;
  --panel:#0d1017;
  --panel-2:#10141d;
  --line:#262d3b;
  --muted:#9199a9;
  --text:#edf0f7;
  --mint:#6a92e7;
  --mint-soft:#bccef4;
  --amber:#ffd27d;
  --shadow:0 18px 54px rgba(0,0,0,.24);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:radial-gradient(circle at 80% -10%,rgba(106,146,231,.08),transparent 30%),var(--bg);color:var(--text)}
a{color:inherit}
.skip-link{position:absolute;top:-100px;left:12px;z-index:30;padding:12px;background:var(--mint);color:var(--bg)}
.skip-link:focus{top:12px}
a:focus-visible{outline:2px solid var(--mint);outline-offset:3px}
.shell{width:min(1160px,calc(100% - 32px));margin:auto}
.topbar{position:sticky;top:0;z-index:20;backdrop-filter:blur(18px);background:rgba(7,10,16,.88);border-bottom:1px solid rgba(255,255,255,.07)}
.topbar .shell{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:68px}
.brand{display:inline-flex;align-items:center;min-height:44px;font-weight:900;letter-spacing:-.04em;text-decoration:none;font-size:19px}.brand b{color:var(--mint)}
.nav{display:flex;align-items:center;gap:10px}.nav a{display:inline-flex;align-items:center;min-height:44px;color:var(--muted);text-decoration:none;font-weight:700;font-size:14px;padding:9px 11px;border-radius:9px}.nav a:hover{color:var(--text);background:rgba(255,255,255,.04)}
.nav .cta{background:var(--mint);color:#06090f}.nav .cta:hover{color:#06090f;background:#85a6ed}
.hero{padding:78px 0 38px}
.crumbs{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:20px}.crumbs a{text-decoration:none}.crumbs span{opacity:.55}
.eyebrow{font:800 12px/1.4 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.12em;color:var(--mint);text-transform:uppercase}
h1{font-size:clamp(40px,6vw,72px);line-height:1.02;letter-spacing:-.055em;max-width:980px;margin:14px 0 20px}
.lead{max-width:850px;font-size:clamp(18px,2.2vw,24px);line-height:1.55;color:#dce0e9;margin:0}
.answer{margin-top:30px;max-width:940px;border:1px solid #354159;border-radius:18px;background:linear-gradient(145deg,rgba(106,146,231,.1),rgba(106,146,231,.025));padding:24px 26px;box-shadow:var(--shadow)}
.answer small{display:block;color:var(--mint);font-weight:900;letter-spacing:.1em;text-transform:uppercase;margin-bottom:10px}
.answer p{font-size:19px;line-height:1.7;margin:0}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:30px;padding:20px 0 72px}
.article{min-width:0}.section{padding:28px 0;border-top:1px solid var(--line)}.section:first-child{border-top:0}
h2{font-size:28px;line-height:1.15;letter-spacing:-.035em;margin:0 0 15px}
.section p{color:#c6ccd7;font-size:16px;line-height:1.78;margin:0 0 15px}
.checklist{display:grid;gap:9px;margin:18px 0 0;padding:0;list-style:none}.checklist li{display:flex;gap:11px;align-items:flex-start;color:#dce0e8;line-height:1.55}.checklist li:before{content:"";width:9px;height:9px;border-radius:50%;background:var(--mint);box-shadow:0 0 0 4px rgba(106,146,231,.09);margin-top:.47em;flex:0 0 auto}
.sidebar{position:relative}.sticky{position:sticky;top:92px;display:grid;gap:14px}
.card{border:1px solid var(--line);background:var(--panel);border-radius:16px;padding:18px}.card h3{font-size:16px;margin:0 0 12px}.card p{font-size:13px;color:var(--muted);line-height:1.6;margin:0 0 12px}
.evidence-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.metric{border:1px solid #232937;background:#090c13;border-radius:10px;padding:10px}.metric span{display:block;color:var(--muted);font-size:10px;text-transform:uppercase;letter-spacing:.08em;margin-bottom:4px}.metric b{font-size:14px}
.mono{font:12px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;word-break:break-all;color:#b7bdca}
.button{display:flex;justify-content:center;align-items:center;gap:8px;text-decoration:none;border-radius:10px;padding:12px 14px;font-weight:850;font-size:14px}.button.primary{background:var(--mint);color:#06090f}.button.secondary{border:1px solid #363f53;color:#dce0e8}
.note{border-left:3px solid var(--amber);background:#16150d;color:#e9dfc6;padding:15px 17px;border-radius:0 10px 10px 0;line-height:1.6}
.sources{display:grid;gap:8px}.sources a{display:block;color:var(--mint-soft);text-decoration:none;font-size:14px;line-height:1.5}.sources a:hover{text-decoration:underline}
.related{padding:42px 0 80px;border-top:1px solid var(--line)}.related h2{margin-bottom:18px}.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.related-card{display:block;text-decoration:none;border:1px solid var(--line);background:var(--panel);border-radius:14px;padding:18px;min-height:145px}.related-card:hover{border-color:#3e4b67;transform:translateY(-1px)}.related-card small{color:var(--mint);font-weight:800}.related-card strong{display:block;margin-top:10px;font-size:17px;line-height:1.35}.related-card span{display:block;color:var(--muted);font-size:12px;margin-top:10px}
.catalog-hero{padding:78px 0 28px}.catalog-intro{max-width:800px;color:#c6ccd7;font-size:18px;line-height:1.7}.filters{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0 30px}.chip{border:1px solid var(--line);border-radius:999px;padding:8px 12px;color:#c4c9d4;font-size:12px}
.guide-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;padding-bottom:76px}.guide-card{display:block;text-decoration:none;border:1px solid var(--line);background:var(--panel);border-radius:16px;padding:21px;min-height:210px}.guide-card:hover{border-color:#424f6b;background:var(--panel-2)}.guide-card small{color:var(--mint);font-weight:850;text-transform:uppercase;letter-spacing:.08em}.guide-card h2{font-size:23px;margin:12px 0}.guide-card p{color:var(--muted);line-height:1.65;margin:0}.guide-card footer{margin-top:18px;color:#c7cdd8;font-size:12px}
.footer{border-top:1px solid var(--line);padding:34px 0 48px;color:var(--muted);font-size:12px}.footer .shell{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
@media(max-width:860px){.layout{grid-template-columns:1fr}.sticky{position:static}.related-grid,.guide-grid{grid-template-columns:1fr}.nav a:not(.cta){display:none}}
@media(max-width:560px){.shell{width:min(100% - 22px,1160px)}.hero,.catalog-hero{padding-top:48px}h1{font-size:40px}.answer{padding:19px}.answer p{font-size:17px}.evidence-grid{grid-template-columns:1fr}.topbar .shell{min-height:60px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}.related-card:hover{transform:none}}

/* Theme modes 2026-10-05. */
.theme-toggle{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 12px;border:1px solid var(--line);border-radius:9px;background:transparent;color:var(--text);font:700 12px/1 Inter,ui-sans-serif,system-ui,sans-serif;white-space:nowrap;cursor:pointer}.theme-toggle:hover{border-color:var(--mint);color:var(--mint)}.theme-toggle:focus-visible{outline:2px solid var(--mint);outline-offset:3px}
html[data-theme="light"]{color-scheme:light;--bg:#f5f6f8;--panel:#fff;--panel-2:#edeff3;--line:#c7ccd5;--muted:#515765;--text:#111318;--mint:#102e72;--mint-soft:#102962;--amber:#8a5a00;--shadow:0 18px 48px rgba(38,45,59,.12)}html[data-theme="light"] body{background:radial-gradient(circle at 80% -10%,rgba(16,46,114,.07),transparent 30%),var(--bg)}html[data-theme="light"] .topbar{background:rgba(245,246,248,.92);border-color:#d8dbe2}html[data-theme="light"] .nav a{color:#414754}html[data-theme="light"] .nav a:hover{background:#e9ecf1;color:#111318}html[data-theme="light"] .nav a:last-child,html[data-theme="light"] .button.primary{background:var(--mint);color:#fff;border-radius:9px}html[data-theme="light"] .lead,html[data-theme="light"] .section p,html[data-theme="light"] .catalog-intro{color:#414754}html[data-theme="light"] .answer{border-color:#a9b2c5;background:linear-gradient(145deg,rgba(16,46,114,.09),rgba(255,255,255,.8))}html[data-theme="light"] .checklist li{color:#262d3b}html[data-theme="light"] .card,html[data-theme="light"] .guide-card,html[data-theme="light"] .related-card,html[data-theme="light"] .metric{background:#fff;border-color:#c7ccd5}html[data-theme="light"] .mono{color:#414754}html[data-theme="light"] .button.secondary{color:#192030;border-color:#9da4b3;background:#fff}html[data-theme="light"] .note{background:#fff8e7;color:#58431b}html[data-theme="light"] .chip{color:#414754}html[data-theme="light"] .footer{color:#515765}
@media(max-width:860px){.theme-toggle{margin-left:auto}.topbar .shell{gap:10px}.nav a:not(:last-child){display:none}}@media(max-width:560px){.theme-toggle{min-height:40px;padding:7px 9px;font-size:10px}}

html[data-theme="light"] .eyebrow,
html[data-theme="light"] .guide-card small,
html[data-theme="light"] .related-card small,
html[data-theme="light"] .sources a{color:#102e72}
html[data-theme="light"] .crumbs,
html[data-theme="light"] .card p,
html[data-theme="light"] .metric span,
html[data-theme="light"] .related-card span{color:#414754}

/* Stage 8: real guide discovery controls. */
.guide-controls{display:grid;gap:14px;margin:24px 0 30px}
.guide-search-label{display:grid;gap:7px;max-width:620px;font-size:13px;font-weight:700}
.guide-search{width:100%;min-height:46px;border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--text);padding:10px 13px;font:15px/1.4 inherit}
.guide-search::placeholder{color:var(--muted)}
.guide-search:focus-visible,.chip:focus-visible{outline:2px solid var(--mint);outline-offset:3px}
.filters{margin:0}.chip{background:transparent;cursor:pointer;font:700 12px/1.2 inherit;min-height:40px}
.chip[aria-pressed="true"]{background:var(--mint);border-color:var(--mint);color:#070a10}
.guide-count{margin:0;color:var(--muted);font-size:12px}
.guide-card[hidden]{display:none!important}
html[data-theme="light"] .guide-search{background:#fff;border-color:#9da4b3;color:#111318}
html[data-theme="light"] .guide-search::placeholder{color:#5e6676}
html[data-theme="light"] .chip[aria-pressed="true"]{background:#102e72;color:#fff;border-color:#102e72}
html[data-theme="light"] .guide-card footer,
html[data-theme="light"] .answer p,
html[data-theme="light"] .sources,
html[data-theme="light"] .footer a{color:#414754}
html[data-theme="light"] .answer small{color:#102e72}
html[data-theme="light"] .evidence-grid .metric{background:#f7f8fa}
html[data-theme="light"] .note{border-left-color:#8a5a00}