:root{
 --ink:#142127;--muted:#5d6c71;--paper:#f3f7f4;--panel:#fff;--line:#d8e3dd;
 --forest:#173b37;--teal:#1d6f6a;--aqua:#4fb8aa;--lime:#9bc968;--yellow:#e8b84f;
 --blue:#477b9c;--red:#a65a50;--shadow:0 14px 38px rgba(20,50,46,.09);
 --radius:18px;--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:#176b66;text-decoration-thickness:1px;text-underline-offset:3px}a:hover{color:#104b48}
.wrap{width:var(--wrap);margin-inline:auto}.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;background:#fff;padding:10px 14px;border-radius:8px;z-index:1000}
.site-header{background:#153733;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:22px}.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none;font-weight:880;letter-spacing:-.02em;min-width:320px}
.brand-mark{width:44px;height:44px;border-radius:11px;background:linear-gradient(145deg,var(--lime),#d0e891);color:#173b37;display:grid;place-items:center;font-size:.73rem;font-weight:950}
.brand-copy{display:flex;flex-direction:column;line-height:1.1}.brand-copy small{font-size:.67rem;color:#c3ddd8;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:#eef8f5;text-decoration:none;padding:8px 10px;border-radius:8px;font-size:.92rem;font-weight:720}.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 #77a29b;padding:8px 11px;border-radius:8px;font:inherit}

.hero{background:
radial-gradient(circle at 84% 15%,rgba(232,184,79,.20),transparent 23rem),
radial-gradient(circle at 96% 78%,rgba(79,184,170,.20),transparent 24rem),
linear-gradient(125deg,#11332f 0%,#1c5a53 62%,#28756b 100%);color:#fff;padding:76px 0 62px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(360px,.92fr);gap:56px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:#ffe09b;font-weight:860;text-transform:uppercase;letter-spacing:.08em;font-size:.76rem}.eyebrow:before{content:"";width:24px;height:3px;background:var(--yellow);border-radius:4px}
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:#dff0ed;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:10px;padding:12px 16px;border:1px solid transparent}
.btn-primary{background:var(--lime);color:#173b37}.btn-primary:hover{background:#b5d981;color:#173b37}.btn-secondary{border-color:#8ab4ad;color:#fff;background:rgba(255,255,255,.04)}.btn-secondary:hover{background:rgba(255,255,255,.10);color:#fff}

.grid-card{background:rgba(7,27,24,.46);border:1px solid rgba(255,255,255,.17);border-radius:20px;padding:22px;box-shadow:0 20px 60px rgba(0,0,0,.18)}
.grid-title{font-size:.78rem;text-transform:uppercase;letter-spacing:.09em;color:#d4e8e4;font-weight:850;margin-bottom:14px}
.flow{display:grid;grid-template-columns:1fr 24px 1fr;gap:8px;align-items:center}.node{background:#fbfefd;color:#173b37;border-radius:9px;padding:12px 11px;min-height:78px;border-left:4px solid var(--aqua)}
.node:nth-of-type(3n){border-left-color:var(--yellow)}.node strong{display:block}.node span{font-size:.73rem;color:#647975}.arrow{text-align:center;color:#ffe19a;font-size:1.35rem;font-weight:900}
.freq{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin-top:10px}.freq div{background:rgba(255,255,255,.08);border-radius:8px;padding:8px;text-align:center;font-size:.7rem;color:#d9ebe8}.freq b{display:block;color:#ffe09b}

.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:#4a5c59;max-width:930px}.kicker{font-weight:900;color:#4f7c31;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:#a8c8be;color:inherit}
.icon{width:48px;height:48px;border-radius:11px;background:#edf6f2;border:1px solid #d3e7df;display:grid;place-items:center;margin-bottom:18px;font-size:.86rem;color:#2d736a;font-weight:950}
.meta{font-size:.86rem;color:#6b7875}.pill{display:inline-flex;padding:5px 9px;border-radius:99px;background:#eaf4ef;color:#3c6e61;font-size:.77rem;font-weight:850;margin:2px}
.callout{border-left:5px solid var(--yellow);background:#fff9ec;border-radius:0 13px 13px 0;padding:18px 20px;margin:24px 0}.callout.info{border-color:var(--teal);background:#eef8f6}.callout.safe{border-color:var(--red);background:#fff5f3}
.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:#4d5f5b;max-width:900px}.breadcrumbs{font-size:.84rem;color:#6b7975;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:20px;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:1.27rem;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:#eef5f2}
.toc{position:sticky;top:94px;background:#fff;border:1px solid var(--line);border-radius:15px;padding:20px}.toc strong{display:block;margin-bottom:8px}.toc a{display:block;padding:6px 0;color:#566c66;text-decoration:none;font-size:.91rem}
.layers{display:grid;gap:8px;margin:26px 0}.layer{display:grid;grid-template-columns:175px 1fr;gap:18px;align-items:center;background:#f7faf8;border:1px solid #dfe9e4;border-radius:10px;padding:13px 16px}.layer strong{color:#397166}
.faq details{background:#fff;border:1px solid var(--line);border-radius:11px;padding:14px 16px;margin-bottom:10px}.faq summary{cursor:pointer;font-weight:850}
.tool{background:linear-gradient(145deg,#153c37,#277066);color:#fff;border-radius:20px;padding:28px;box-shadow:var(--shadow)}.tool label{display:block;font-weight:800;margin-bottom:6px}.tool input{width:100%;padding:11px 12px;border-radius:8px;border:1px solid #93b8b2;background:#fff;color:#172a27;font:inherit}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.result{margin-top:20px;padding:18px;border-radius:11px;background:#f4faf7;color:#17302c}.result strong{font-size:1.42rem}.small{font-size:.87rem;color:#667774}.source-list li{margin-bottom:14px}
.site-footer{margin-top:64px;background:#102e2a;color:#d8e8e4;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:#cce1dc}.footer-brand{font-weight:900;color:#fff}.footer-note{font-size:.85rem;color:#9eb9b3;margin-top:24px;padding-top:18px;border-top:1px solid rgba(255,255,255,.13)}
.notice{font-size:.85rem;color:#62726f;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:#5c9b60;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:#183f3a;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)}.freq{grid-template-columns:1fr}.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}}