:root{
  --ink:#13202a;
  --muted:#55636e;
  --paper:#f5f7f8;
  --panel:#ffffff;
  --line:#d9e0e4;
  --steel:#243744;
  --steel-2:#304b5c;
  --signal:#f0a52b;
  --signal-2:#ffc75e;
  --cyan:#2c899a;
  --ok:#2f7d62;
  --danger:#9b4d3c;
  --shadow:0 12px 34px rgba(13,31,43,.09);
  --radius:18px;
  --wrap:min(1460px, 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:#136778;text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:#0d4e5b}
img,svg{max-width:100%;height:auto}
.wrap{width:var(--wrap);margin-inline:auto}
.skip-link{position:absolute;left:-9999px;top:0}.skip-link:focus{left:12px;top:12px;background:#fff;padding:10px 14px;z-index:1000;border-radius:8px}
.site-header{background:linear-gradient(110deg,#182833,#253d4b);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:800;letter-spacing:-.02em;min-width:260px}
.brand-mark{width:42px;height:42px;border-radius:11px;background:linear-gradient(145deg,var(--signal),var(--signal-2));display:grid;place-items:center;color:#17242e;font-size:.72rem;font-weight:900;box-shadow:inset 0 0 0 1px rgba(255,255,255,.35)}
.brand-copy{display:flex;flex-direction:column;line-height:1.1}
.brand-copy small{font-size:.70rem;font-weight:650;color:#bfd0da;letter-spacing:.03em;text-transform:uppercase}
.nav-links{margin-left:auto;display:flex;gap:5px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.nav-links a{color:#eaf2f5;text-decoration:none;padding:8px 10px;border-radius:9px;font-size:.94rem;font-weight:650}
.nav-links a:hover,.nav-links a[aria-current="page"]{background:rgba(255,255,255,.10);color:#fff}
.nav-toggle{display:none;margin-left:auto;background:transparent;color:#fff;border:1px solid rgba(255,255,255,.35);padding:8px 11px;border-radius:9px;font:inherit}

.hero{background:
radial-gradient(circle at 82% 16%,rgba(240,165,43,.20),transparent 22rem),
linear-gradient(120deg,#182832 0%,#223b49 68%,#1e5660 100%);color:#fff;padding:72px 0 58px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(320px,.88fr);gap:56px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:#ffd98f;font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:.78rem}
.eyebrow:before{content:"";width:26px;height:3px;background:var(--signal);border-radius:3px}
h1,h2,h3{line-height:1.15;letter-spacing:-.035em}
h1{font-size:clamp(2.35rem,5vw,4.7rem);margin:.28em 0 .28em;max-width:950px}
.hero p{color:#dbe8ed;font-size:1.16rem;max-width:760px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none;font-weight:800;border-radius:11px;padding:12px 16px;border:1px solid transparent}
.btn-primary{background:var(--signal);color:#18252d}.btn-primary:hover{background:#ffc45c;color:#18252d}
.btn-secondary{border-color:#8aa6b4;color:#fff;background:rgba(255,255,255,.04)}.btn-secondary:hover{background:rgba(255,255,255,.10);color:#fff}
.flow-card{background:rgba(10,22,29,.46);border:1px solid rgba(255,255,255,.17);border-radius:22px;padding:22px;box-shadow:0 18px 55px rgba(0,0,0,.19)}
.flow-label{font-weight:800;color:#d7e5eb;margin-bottom:14px}
.flow{display:grid;grid-template-columns:1fr 28px 1fr;align-items:center;gap:7px}
.node{background:#f8fbfc;color:#20313b;border-radius:14px;padding:15px 12px;min-height:86px;display:flex;flex-direction:column;justify-content:center;border-left:4px solid var(--signal)}
.node strong{font-size:1rem}.node span{font-size:.78rem;color:#60717d}
.arrow{color:#ffd071;text-align:center;font-size:1.45rem}
.status-row{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:10px}
.status{font-size:.72rem;padding:7px;border-radius:8px;background:rgba(255,255,255,.08);text-align:center;color:#dbe8ed}
.status b{display:block;color:#9fe0c4}

main{min-height:55vh}
.section{padding:62px 0}
.section-tight{padding:42px 0}
.section h2{font-size:clamp(1.75rem,3vw,2.6rem);margin:0 0 14px}
.lead{font-size:1.13rem;color:#42535e;max-width:920px}
.kicker{font-weight:850;color:#8f5d12;text-transform:uppercase;letter-spacing:.08em;font-size:.77rem}
.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{margin-top:0;font-size:1.32rem}
.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:#aebbc3;color:inherit}
.icon{width:46px;height:46px;border-radius:12px;background:#fff4de;border:1px solid #efd5a3;display:grid;place-items:center;font-size:1.25rem;margin-bottom:18px}
.meta{font-size:.86rem;color:#6a7881}
.callout{border-left:5px solid var(--signal);background:#fffaf1;border-radius:0 14px 14px 0;padding:18px 20px;margin:25px 0}
.callout.info{border-color:var(--cyan);background:#f2fbfc}
.callout.safety{border-color:#a45b49;background:#fff7f5}
.pill{display:inline-flex;padding:5px 9px;border-radius:99px;background:#e8f1f3;color:#2a6673;font-size:.78rem;font-weight:800;margin:2px}
.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:20px;padding:clamp(24px,4vw,52px);box-shadow:var(--shadow)}
.article h1{font-size:clamp(2.1rem,4vw,3.7rem);margin-top:.1em}
.article h2{font-size:clamp(1.55rem,2.6vw,2.15rem);margin-top:1.65em}
.article h3{font-size:1.28rem;margin-top:1.55em}
.article p,.article li{max-width:82ch}
.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:#edf3f5}
.article code{background:#eef2f4;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:#3f5b66;text-decoration:none;font-size:.91rem}
.toc a:hover{color:#0b687a}
.breadcrumbs{font-size:.84rem;color:#67757e;margin-bottom:18px}.breadcrumbs a{color:inherit}
.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;max-width:880px;color:#4d5d67}
.steps{counter-reset:step;display:grid;gap:15px}.step{position:relative;padding:18px 18px 18px 64px;background:#fff;border:1px solid var(--line);border-radius:14px}
.step:before{counter-increment:step;content:counter(step);position:absolute;left:16px;top:18px;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--steel);color:#fff;font-weight:900}
.diagram{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;align-items:stretch;margin:28px 0}
.diagram .dnode{position:relative;background:#f5f8f9;border:1px solid #cdd8dd;border-top:4px solid var(--signal);border-radius:12px;padding:14px;text-align:center}
.diagram .dnode:not(:last-child):after{content:"→";position:absolute;right:-17px;top:38%;z-index:2;color:#667985;font-size:1.15rem;font-weight:900}
.checklist{list-style:none;padding:0}.checklist li{position:relative;padding-left:28px;margin:.5em 0}.checklist li:before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:900}
.tool{background:#182b36;color:#fff;border-radius:20px;padding:28px;box-shadow:var(--shadow)}
.tool label{display:block;font-weight:750;margin-bottom:6px}
.tool input,.tool select{width:100%;padding:11px 12px;border-radius:9px;border:1px solid #8da1ab;font:inherit;background:#fff;color:#172631}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.result{margin-top:20px;padding:18px;border-radius:12px;background:#f7fbfc;color:#17303b}
.result strong{font-size:1.4rem}
.small{font-size:.88rem;color:#64727b}
.source-list li{margin-bottom:14px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:800}
.site-footer{margin-top:64px;background:#15252f;color:#dbe5e9;padding:44px 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:#c9dce4}
.footer-brand{font-weight:850;color:#fff}.footer-note{font-size:.86rem;color:#aebfc7;margin-top:25px;padding-top:18px;border-top:1px solid rgba(255,255,255,.13)}
.notice{font-size:.85rem;color:#586873;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:900;color:#dca143;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))}
  .diagram{grid-template-columns:1fr}
  .diagram .dnode:not(:last-child):after{content:"↓";right:auto;left:50%;top:auto;bottom:-18px}
}
@media(max-width:760px){
  :root{--wrap:min(100% - 24px,1460px)}
  .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:#1c303c;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}.flow{grid-template-columns:1fr}.arrow{transform:rotate(90deg)}
  .grid,.grid-2,.form-grid,.footer-grid{grid-template-columns:1fr}
  .section{padding:46px 0}
  .article{padding:24px 18px}
  .article table{display:block;overflow-x:auto}
}