:root{
  --ink:#10202a;
  --muted:#596b75;
  --paper:#f4f8f7;
  --panel:#ffffff;
  --line:#d8e4e0;
  --deep:#0b2731;
  --grid:#124b59;
  --electric:#2fb8c8;
  --green:#57b87c;
  --lime:#a6d86f;
  --sun:#f6bf48;
  --orange:#ed8f4b;
  --shadow:0 14px 40px rgba(14,48,57,.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:#087685;text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:#075862}
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:#092630;color:#fff;position:sticky;top:0;z-index:50;box-shadow:0 1px 0 rgba(255,255,255,.09)}
.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:880;letter-spacing:-.02em;min-width:300px}
.brand-mark{width:44px;height:44px;border-radius:13px;background:linear-gradient(145deg,var(--sun),#ffe19b);color:#13313a;display:grid;place-items:center;font-size:1.05rem;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:.68rem;color:#bcd6dc;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:#edf8fa;text-decoration:none;padding:8px 10px;border-radius:9px;font-size:.93rem;font-weight:720}
.nav-links a:hover,.nav-links a[aria-current="page"]{background:rgba(255,255,255,.11)}
.nav-toggle{display:none;margin-left:auto;background:transparent;color:#fff;border:1px solid #668892;padding:8px 11px;border-radius:9px;font:inherit}

.hero{position:relative;overflow:hidden;background:
radial-gradient(circle at 84% 14%,rgba(246,191,72,.22),transparent 22rem),
radial-gradient(circle at 75% 92%,rgba(87,184,124,.19),transparent 24rem),
linear-gradient(125deg,#082731 0%,#0e4250 58%,#126575 100%);color:#fff;padding:76px 0 62px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(360px,.9fr);gap:58px;align-items:center}
.eyebrow{display:inline-flex;gap:8px;align-items:center;color:#c6f3dc;font-weight:860;text-transform:uppercase;letter-spacing:.08em;font-size:.76rem}
.eyebrow:before{content:"";width:25px;height:3px;background:var(--sun);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:#d9edf0;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:860;border-radius:11px;padding:12px 16px;border:1px solid transparent}
.btn-primary{background:var(--sun);color:#14313a}.btn-primary:hover{background:#ffd77b;color:#14313a}
.btn-secondary{border-color:#82aeb7;color:#fff;background:rgba(255,255,255,.04)}.btn-secondary:hover{background:rgba(255,255,255,.10);color:#fff}

.grid-card{background:rgba(5,27,33,.48);border:1px solid rgba(255,255,255,.18);border-radius:24px;padding:22px;box-shadow:0 20px 60px rgba(0,0,0,.20)}
.grid-title{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:#d3e8eb;font-weight:850;margin-bottom:15px}
.power-flow{display:grid;grid-template-columns:1fr 28px 1fr;gap:8px;align-items:center}
.pnode{background:#f8fcfb;color:#17323a;border-radius:13px;padding:13px 12px;min-height:78px;border-left:4px solid var(--green)}
.pnode:nth-of-type(3n){border-left-color:var(--sun)}
.pnode strong{display:block}.pnode span{font-size:.74rem;color:#637982}
.arrow{text-align:center;color:#ffd878;font-size:1.35rem;font-weight:900}
.freq{margin-top:13px;border:1px solid rgba(255,255,255,.14);background:rgba(255,255,255,.07);border-radius:12px;padding:11px 13px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.freq strong{font-size:1.35rem;color:#baf0cc}.freq span{font-size:.77rem;color:#d7e7ea}

.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:#435962;max-width:930px}
.kicker{font-weight:900;color:#18805a;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:#a8c5bc;color:inherit}
.icon{width:48px;height:48px;border-radius:13px;background:#ecf8f3;border:1px solid #cbe8db;display:grid;place-items:center;margin-bottom:18px;font-size:1.05rem;color:#17674d;font-weight:950}
.meta{font-size:.86rem;color:#6b7a80}
.pill{display:inline-flex;padding:5px 9px;border-radius:99px;background:#eaf7f2;color:#19694e;font-size:.77rem;font-weight:850;margin:2px}
.callout{border-left:5px solid var(--green);background:#f1fbf5;border-radius:0 14px 14px 0;padding:18px 20px;margin:24px 0}
.callout.info{border-color:var(--electric);background:#effaFC}
.callout.warn{border-color:var(--orange);background:#fff6ef}

.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:#4c6068;max-width:900px}
.breadcrumbs{font-size:.84rem;color:#6d7c82;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 h2{font-size:clamp(1.55rem,2.6vw,2.16rem);margin-top:1.65em}.article h3{font-size:1.26rem;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:#eef6f3}
.article code{background:#eff4f3;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:#566b73;text-decoration:none;font-size:.91rem}.toc a:hover{color:#087685}
.layers{display:grid;gap:8px;margin:26px 0}.layer{display:grid;grid-template-columns:150px 1fr;gap:18px;align-items:center;background:#f5faf8;border:1px solid #d9e8e2;border-radius:12px;padding:13px 16px}.layer strong{color:#166c51}
.steps{counter-reset:step;display:grid;gap:14px}.step{position:relative;padding:18px 18px 18px 64px;background:#fafdfc;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:#116b78;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:#18805a;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,#082a34,#0c5360);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 #8db7bd;background:#fff;color:#10242b;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:#f4fbf8;color:#17313a}.result strong{font-size:1.42rem}
.small{font-size:.87rem;color:#65777e}.source-list li{margin-bottom:14px}

.site-footer{margin-top:64px;background:#071f27;color:#d6e7ea;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:#c8e4e8}.footer-brand{font-weight:900;color:#fff}.footer-note{font-size:.85rem;color:#9eb8be;margin-top:24px;padding-top:18px;border-top:1px solid rgba(255,255,255,.13)}
.notice{font-size:.85rem;color:#607279;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:#55aa80;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:#0a303a;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}.power-flow{grid-template-columns:1fr}.arrow{transform:rotate(90deg)}
  .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}
}