:root{
  --bg:#0c1f33;
  --bg2:#16324f;
  --ink:#142033;
  --muted:#56677d;
  --soft:#f5f8fb;
  --soft2:#eaf1f8;
  --card:#ffffff;
  --line:#d9e3ee;
  --accent:#0f6b68;
  --accent2:#174c7c;
  --warn:#7a4c00;
  --shadow:0 14px 34px rgba(17,36,64,.10);
  --radius:18px;
  --wrap:1220px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:#fff;color:var(--ink);line-height:1.65;font-size:16px;overflow-x:hidden}
a{color:#0d5c9b;text-decoration-thickness:.08em;text-underline-offset:.18em}
a:hover{color:#083f6b}
img{max-width:100%;height:auto}
.wrap{width:min(var(--wrap),calc(100% - 32px));margin-inline:auto}
.skip-link{position:absolute;left:-999px;top:10px;background:#fff;color:#000;padding:.7rem 1rem;z-index:999;border-radius:8px}
.skip-link:focus{left:10px}
.site-header{background:rgba(12,31,51,.98);color:#fff;position:sticky;top:0;z-index:1000;box-shadow:0 3px 18px rgba(0,0,0,.16)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 0}
.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none;min-width:250px}
.brand span{display:flex;flex-direction:column;line-height:1.1}
.brand strong{font-size:1.02rem;letter-spacing:.01em}
.brand small{font-size:.82rem;color:#cbd9e8;margin-top:4px}
.site-nav{display:flex;align-items:center;justify-content:flex-end;gap:3px;flex-wrap:wrap}
.site-nav a{color:#e8f1fa;text-decoration:none;padding:.55rem .7rem;border-radius:999px;font-size:.91rem;white-space:nowrap}
.site-nav a:hover,.site-nav a.active{background:rgba(255,255,255,.13);color:#fff}
.nav-toggle{display:none;background:#fff;color:var(--bg);border:0;border-radius:10px;padding:.65rem .85rem;font-weight:700}
.hero,.page-hero{background:linear-gradient(135deg,#0c1f33 0%,#16324f 52%,#0f6b68 100%);color:#fff}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(290px,.85fr);gap:34px;align-items:center;padding:70px 0}
.page-hero .wrap{padding:48px 0}
h1{font-size:clamp(2.15rem,5vw,4.25rem);line-height:1.04;margin:.15em 0 .35em;letter-spacing:-.045em}
.page-hero h1{font-size:clamp(2rem,4vw,3.35rem)}
h2{line-height:1.18;letter-spacing:-.02em;font-size:clamp(1.35rem,2.4vw,2rem);margin:1.5rem 0 .65rem}
h3{line-height:1.25;margin:1rem 0 .45rem;font-size:1.18rem}.lead{font-size:clamp(1.08rem,2vw,1.32rem);max-width:860px;color:#e5eef7}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.78rem;font-weight:800;color:#87d9d3;margin:0 0 .7rem}.updated{color:#d6e5f3;font-size:.95rem}.hero-panel,.note-card,.summary-box,.source-box,.side-note{background:#fff;color:var(--ink);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.hero-panel{background:rgba(255,255,255,.96)}.hero-panel h2,.note-card h2,.summary-box h2,.source-box h2,.side-note h2{margin-top:0}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.button{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;border:2px solid var(--accent);background:var(--accent);color:#fff;text-decoration:none;font-weight:800;border-radius:999px;padding:.78rem 1.05rem;min-height:44px}.button:hover{background:#0b5653;color:#fff}.button.ghost{background:transparent;border-color:rgba(255,255,255,.75);color:#fff}.button.ghost:hover{background:rgba(255,255,255,.13)}.button.full{width:100%;border-radius:12px}.section{padding:42px 0}.card-grid{display:grid;gap:20px}.card-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.card-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.card-grid.four{grid-template-columns:repeat(4,minmax(0,1fr))}.card,.mini-card,.term{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 7px 22px rgba(22,50,79,.07)}.card h2,.card h3,.mini-card h3,.term h2{margin-top:0}.card p:last-child,.mini-card p:last-child,.note-card p:last-child{margin-bottom:0}.split{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(300px,.8fr);gap:28px;align-items:start}.breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:.92rem;margin-bottom:18px;color:#dbe8f4}.breadcrumbs span:not(:last-child)::after{content:'›';margin-left:8px;color:#bfd2e3}.breadcrumbs a{color:#fff}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:32px;padding:42px 0}.article-body{font-size:1.06rem;max-width:850px}.article-body section{margin-bottom:28px}.article-body p{margin-top:0}.side-note{position:sticky;top:98px;align-self:start}.check-list{padding-left:0;list-style:none}.check-list li{position:relative;padding-left:1.75rem;margin:.55rem 0}.check-list li::before{content:'✓';position:absolute;left:0;top:0;color:var(--accent);font-weight:900}.source-box{background:#f8fbfe}.source-box ul{margin-bottom:0}.related{border-top:1px solid var(--line);padding-top:24px}.mini-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.worksheet-step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}.worksheet-step h2{display:flex;gap:12px;align-items:center}.worksheet-step h2 span{display:inline-grid;place-items:center;background:var(--accent2);color:#fff;border-radius:50%;width:38px;height:38px;flex:0 0 38px;font-size:1rem}.glossary-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.term h2{font-size:1.15rem}.site-footer{background:var(--bg);color:#e9f1f8;margin-top:34px}.footer-grid{display:grid;grid-template-columns:1.2fr 1fr .8fr;gap:28px;padding:38px 0}.site-footer h2{font-size:1.08rem;margin-top:0}.site-footer a{color:#d6fff9}.footer-links{list-style:none;padding:0;margin:0}.footer-links li{margin:.35rem 0}.footer-bottom{border-top:1px solid rgba(255,255,255,.15);padding:16px 0;color:#b9cada}
@media (max-width:1050px){.site-nav{display:none;position:absolute;left:16px;right:16px;top:78px;background:#102a45;border:1px solid rgba(255,255,255,.18);border-radius:16px;padding:12px;box-shadow:0 18px 38px rgba(0,0,0,.28)}.site-nav.open{display:grid;grid-template-columns:1fr 1fr}.nav-toggle{display:inline-flex}.hero-grid,.split,.article-layout,.footer-grid{grid-template-columns:1fr}.side-note{position:static}.card-grid.four,.card-grid.three{grid-template-columns:repeat(2,minmax(0,1fr))}.mini-grid{grid-template-columns:1fr}.brand{min-width:0}.brand strong{font-size:.95rem}}
@media (max-width:680px){.wrap{width:min(100% - 24px,var(--wrap))}.hero-grid{padding:48px 0}.page-hero .wrap{padding:36px 0}.site-nav.open{grid-template-columns:1fr}.card-grid.two,.card-grid.three,.card-grid.four,.glossary-grid{grid-template-columns:1fr}.hero-actions{flex-direction:column}.button{width:100%;border-radius:12px}.brand small{display:none}.article-body{font-size:1rem}.hero-panel,.note-card,.summary-box,.source-box,.side-note,.card,.mini-card,.term{padding:18px}}
@media print{.site-header,.site-footer,.side-note,.hero-actions,.nav-toggle{display:none}.page-hero,.hero{background:#fff;color:#000}.lead,.updated,.breadcrumbs,.breadcrumbs a{color:#000}.article-layout{display:block}.card,.note-card,.summary-box,.source-box,.worksheet-step{box-shadow:none}}