:root{
  --ink:#172036;
  --muted:#5e687d;
  --paper:#f5f7fb;
  --panel:#ffffff;
  --line:#dce1ec;
  --navy:#171d35;
  --indigo:#3841a3;
  --violet:#6656c9;
  --mint:#65d6bf;
  --coral:#f08a73;
  --sky:#eaf0ff;
  --shadow:0 14px 38px rgba(24,33,63,.09);
  --radius:20px;
  --wrap:min(1480px,calc(100% - 36px));
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.68}
a{color:#3947a9;text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:#202a7f}
img,svg{max-width:100%;height:auto}
.wrap{width:var(--wrap);margin-inline:auto}
.skip{position:absolute;left:-9999px;top:0}.skip:focus{left:12px;top:12px;background:#fff;padding:10px 14px;border-radius:8px;z-index:1000}
.site-header{background:#141a2f;color:#fff;position:sticky;top:0;z-index:50;box-shadow:0 1px 0 rgba(255,255,255,.08)}
.nav-row{min-height:74px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none;font-weight:850;min-width:300px;letter-spacing:-.02em}
.brand-mark{width:44px;height:44px;border-radius:13px;background:linear-gradient(145deg,var(--mint),#b6f1e3);color:#152033;display:grid;place-items:center;font-size:.77rem;font-weight:950;box-shadow:inset 0 0 0 1px rgba(255,255,255,.6)}
.brand-copy{display:flex;flex-direction:column;line-height:1.12}.brand-copy small{font-size:.69rem;color:#bfc8e5;text-transform:uppercase;letter-spacing:.08em}
.nav-links{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap;justify-content:flex-end}
.nav-links a{color:#edf0fb;text-decoration:none;padding:8px 10px;border-radius:9px;font-size:.93rem;font-weight:700}
.nav-links a:hover,.nav-links a[aria-current="page"]{background:rgba(255,255,255,.10)}
.nav-toggle{display:none;margin-left:auto;background:transparent;color:#fff;border:1px solid #66708e;padding:8px 11px;border-radius:9px;font:inherit}

.hero{position:relative;overflow:hidden;background:
radial-gradient(circle at 78% 5%,rgba(101,214,191,.24),transparent 24rem),
radial-gradient(circle at 92% 78%,rgba(240,138,115,.15),transparent 20rem),
linear-gradient(125deg,#151b31 0%,#272d65 64%,#3f4596 100%);color:#fff;padding:76px 0 62px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(360px,.92fr);gap:58px;align-items:center}
.eyebrow{display:inline-flex;gap:8px;align-items:center;color:#a7f1df;font-weight:850;text-transform:uppercase;letter-spacing:.08em;font-size:.76rem}
.eyebrow:before{content:"";width:24px;height:3px;background:var(--mint);border-radius:5px}
h1,h2,h3{line-height:1.15;letter-spacing:-.035em}
h1{font-size:clamp(2.35rem,5vw,4.7rem);margin:.26em 0}
.hero p{color:#dce2f5;font-size:1.17rem;max-width:800px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;font-weight:850;border-radius:11px;padding:12px 16px;border:1px solid transparent}
.btn-primary{background:var(--mint);color:#142034}.btn-primary:hover{background:#9ee9d9;color:#142034}
.btn-secondary{border-color:#8993bb;color:#fff;background:rgba(255,255,255,.04)}.btn-secondary:hover{background:rgba(255,255,255,.10);color:#fff}

.map-card{background:rgba(13,17,35,.45);border:1px solid rgba(255,255,255,.18);border-radius:24px;padding:22px;box-shadow:0 18px 60px rgba(0,0,0,.18)}
.map-title{font-size:.83rem;text-transform:uppercase;letter-spacing:.08em;color:#cfd7ef;font-weight:850;margin-bottom:15px}
.system-map{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.map-node{position:relative;background:#f9fbff;color:#1a2440;border-radius:13px;padding:13px 11px;min-height:82px;border-top:4px solid var(--mint)}
.map-node:nth-child(2n){border-top-color:var(--coral)}
.map-node:nth-child(3n){border-top-color:#8fa4ff}
.map-node strong{display:block}.map-node span{font-size:.75rem;color:#65708b}
.map-center{grid-column:2;background:#252d62;color:#fff;border:1px solid #6671b6;border-top:4px solid #b7c3ff}.map-center span{color:#cbd3f2}

.section{padding:62px 0}.section-tight{padding:42px 0}
.section h2{font-size:clamp(1.75rem,3vw,2.65rem);margin:0 0 14px}
.lead{font-size:1.13rem;color:#47546c;max-width:930px}
.kicker{font-weight:900;color:#5543b9;text-transform:uppercase;letter-spacing:.08em;font-size:.76rem}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.card h3{font-size:1.31rem;margin-top:0}.card p:last-child{margin-bottom:0}
.card-link{display:block;color:inherit;text-decoration:none;transition:transform .16s ease,border-color .16s ease}
.card-link:hover{transform:translateY(-2px);border-color:#aeb6d2;color:inherit}
.icon{width:46px;height:46px;border-radius:13px;background:#edf0ff;border:1px solid #d4d9fa;display:grid;place-items:center;margin-bottom:18px;font-size:1.15rem;color:#343d9f;font-weight:900}
.meta{font-size:.86rem;color:#6f788e}
.pill{display:inline-flex;padding:5px 9px;border-radius:99px;background:#edf0ff;color:#434ca5;font-size:.77rem;font-weight:850;margin:2px}
.callout{border-left:5px solid var(--violet);background:#f5f3ff;border-radius:0 14px 14px 0;padding:18px 20px;margin:24px 0}
.callout.info{border-color:var(--mint);background:#effbf8}
.callout.warn{border-color:var(--coral);background:#fff5f2}

.page-head{padding:54px 0 30px}.page-head h1{font-size:clamp(2.2rem,4vw,3.7rem);margin:.18em 0}.page-head p{font-size:1.12rem;color:#4c5870;max-width:900px}
.breadcrumbs{font-size:.84rem;color:#727b8e;margin-bottom:18px}.breadcrumbs a{color:inherit}
.article-shell{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:42px;align-items:start}
.article{background:#fff;border:1px solid var(--line);border-radius:21px;padding:clamp(24px,4vw,52px);box-shadow:var(--shadow)}
.article h1{font-size:clamp(2.1rem,4vw,3.7rem)}
.article h2{font-size:clamp(1.55rem,2.6vw,2.16rem);margin-top:1.65em}
.article h3{font-size:1.25rem;margin-top:1.5em}
.article p,.article li{max-width:84ch}
.article table{width:100%;border-collapse:collapse;margin:24px 0;font-size:.94rem}
.article th,.article td{text-align:left;border:1px solid var(--line);padding:11px 12px;vertical-align:top}
.article th{background:#f0f2fb}
.article code{background:#eff1f6;padding:.12em .35em;border-radius:5px}
.toc{position:sticky;top:94px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px}
.toc strong{display:block;margin-bottom:8px}.toc a{display:block;padding:6px 0;color:#56617a;text-decoration:none;font-size:.91rem}.toc a:hover{color:#303b9d}
.layer-stack{display:grid;gap:8px;margin:26px 0}
.layer{display:grid;grid-template-columns:150px 1fr;gap:18px;align-items:center;background:#f5f7fc;border:1px solid #dce1ed;border-radius:12px;padding:13px 16px}
.layer strong{color:#313b94}
.steps{counter-reset:step;display:grid;gap:14px}.step{position:relative;padding:18px 18px 18px 64px;background:#fafbfe;border:1px solid var(--line);border-radius:13px}
.step:before{counter-increment:step;content:counter(step);position:absolute;left:16px;top:17px;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--indigo);color:#fff;font-weight:900}
.checklist{list-style:none;padding:0}.checklist li{position:relative;padding-left:27px;margin:.5em 0}.checklist li:before{content:"✓";position:absolute;left:0;color:#178a73;font-weight:950}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:10px}.faq summary{cursor:pointer;font-weight:850}

.tool{background:linear-gradient(145deg,#171e37,#2d3474);color:#fff;border-radius:21px;padding:28px;box-shadow:var(--shadow)}
.tool label{display:block;font-weight:800;margin-bottom:6px}.tool input,.tool select{width:100%;padding:11px 12px;border-radius:9px;border:1px solid #9ea7c8;background:#fff;color:#172036;font:inherit}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.result{margin-top:20px;padding:18px;border-radius:12px;background:#f7f9ff;color:#19213b}.result strong{font-size:1.45rem}
.small{font-size:.87rem;color:#6a7489}
.source-list li{margin-bottom:14px}

.site-footer{margin-top:64px;background:#11172b;color:#dbe0f1;padding:45px 0 28px}
.footer-grid{display:grid;grid-template-columns:minmax(260px,1.3fr) repeat(3,minmax(150px,1fr));gap:28px}
.site-footer h3{color:#fff;font-size:1rem;margin-top:0}.site-footer a{color:#cbd3f4}.footer-brand{font-weight:900;color:#fff}.footer-note{font-size:.85rem;color:#9fa9c6;margin-top:24px;padding-top:18px;border-top:1px solid rgba(255,255,255,.13)}
.notice{font-size:.85rem;color:#616b82;border-top:1px solid var(--line);margin-top:36px;padding-top:18px}
.not-found{text-align:center;padding:90px 20px}.not-found .code{font-size:5rem;font-weight:950;color:#7065ce;margin:0}

@media(max-width:980px){
  .hero-grid,.article-shell{grid-template-columns:1fr}
  .toc{position:static}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:760px){
  :root{--wrap:min(100% - 24px,1480px)}
  .site-header{position:relative}.nav-row{min-height:66px}.brand{min-width:0;max-width:76%}.brand-copy small{display:none}
  .nav-toggle{display:block}.nav-links{display:none;position:absolute;top:66px;left:0;right:0;background:#181f39;padding:12px 18px 18px;flex-direction:column;align-items:stretch}
  .nav-links.open{display:flex}.nav-links a{padding:10px}
  .hero{padding:52px 0 44px}.hero-grid{gap:34px}.system-map{grid-template-columns:1fr 1fr}.map-center{grid-column:auto}
  .grid,.grid-2,.form-grid,.footer-grid{grid-template-columns:1fr}
  .layer{grid-template-columns:1fr;gap:4px}.section{padding:46px 0}.article{padding:24px 18px}.article table{display:block;overflow-x:auto}
}