:root{--bg:#f6f9f7;--surface:#ffffff;--ink:#14263a;--muted:#4a5b6c;--accent:#0b67a3;--accent-ink:#ffffff;--accent2:#f27d16;--line:#d3e2ec;--hero-ink:#ffffff;--r:18px;--maxw:1160px;--measure:66ch;--hf:'Lexend', system-ui, sans-serif;--bf:'Merriweather', Georgia, serif}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16.5px/1.65 var(--bf)}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-underline-offset:.18em}
h1,h2,h3,h4{font-family:var(--hf);line-height:1.18;margin:1.6em 0 .5em;font-weight:700;letter-spacing:-.01em}
h1{font-size:clamp(2rem,5vw,3.1rem);margin-top:0}
h2{font-size:clamp(1.4rem,3vw,2rem)}h3{font-size:1.2rem}
p,ul,ol,table,details{margin:0 0 1.1em}
.wrap{max-width:max(var(--maxw),min(88vw,1760px));margin:0 auto;padding:0 20px}
@media(min-width:1800px){body article.prose>:is(p,ul,ol,h2,h3,h4,blockquote,dl,details,.callout,.disclosure,.table-wrap){max-width:52rem}}
.skip{position:absolute;left:-999px}.skip:focus{left:10px;top:10px;background:var(--surface);padding:8px;z-index:9}
header.site{border-bottom:1px solid var(--line);background:var(--surface)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-top:14px;padding-bottom:14px;flex-wrap:wrap}
.brand{font-family:var(--hf);font-weight:800;font-size:1.25rem;color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:10px}
.brand svg{flex:none}
nav.main ul{list-style:none;display:flex;flex-wrap:wrap;gap:4px 18px;margin:0;padding:0}
nav.main a{color:var(--ink);text-decoration:none;font-size:.95rem;padding:4px 0;border-bottom:2px solid transparent}
nav.main a[aria-current]{border-color:var(--accent)}
.menu-btn{display:none}
@media(max-width:760px){.menu-btn{display:inline-block;background:none;border:1px solid var(--line);color:var(--ink);border-radius:var(--r);padding:6px 12px;font:inherit}
nav.main{width:100%;display:none}nav.main.open{display:block}nav.main ul{flex-direction:column;gap:6px}}
.hero{position:relative;overflow:hidden}
.hero .wrap{padding-top:56px;padding-bottom:56px}
.hero .lead{font-size:1.18rem;color:var(--muted);max-width:60ch}
.hero.full{color:var(--hero-ink);min-height:440px;display:flex;align-items:flex-end}
.hero.full img.bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero.full::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.05),rgba(0,0,0,.62))}
.hero.full .wrap{position:relative;z-index:1;width:100%}.hero.full .lead{color:inherit;opacity:.92}
.hero.split .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero.split img{border-radius:var(--r);aspect-ratio:4/3;object-fit:cover;width:100%}
.hero.banner img{width:100%;max-height:380px;object-fit:cover;border-radius:var(--r);margin-top:28px}
.hero.plain{background:var(--surface);border-bottom:1px solid var(--line)}
@media(max-width:760px){.hero.split .wrap{grid-template-columns:1fr}.hero.full{min-height:340px}.hero .wrap{padding-top:36px;padding-bottom:36px}}
.page{display:grid;gap:48px;padding-top:40px;padding-bottom:64px}
.page.toc-layout{grid-template-columns:220px minmax(0,1fr)}
.page.toc-layout .toc{position:sticky;top:20px;align-self:start;font-size:.92rem;border-left:3px solid var(--accent);padding-left:14px}
.page.toc-layout .toc ul{list-style:none;padding:0;margin:0}.page.toc-layout .toc li{margin:.35em 0}
.page.toc-layout .toc a{color:var(--muted);text-decoration:none}
@media(max-width:860px){.page.toc-layout{grid-template-columns:1fr}.page.toc-layout .toc{position:static}}
/* Content uses the full container width (cards, grids, tables); only running text keeps a readable measure. */
article.prose{max-width:none;min-width:0}
article.prose>:is(p,ul,ol,h2,h3,h4,blockquote,dl,details,.callout,.disclosure,.table-wrap){max-width:47.5rem;margin-left:auto;margin-right:auto}
.page.toc-layout article.prose>*{margin-left:0;margin-right:0}
/* A heading that introduces a full-width block (cards, grid, table) lines up with that block, not the text column. */
body article.prose>:is(h2,h3):has(+ :is(.cards,nav,div,table,section,ul.grid)){max-width:none;margin-left:0;margin-right:0}
.page.wide article.prose>*{max-width:none}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;margin:0 0 1.4em}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px}
.card h3{margin-top:0}.card p:last-child{margin-bottom:0}
a.card{display:block;color:var(--ink);text-decoration:none}a.card:hover{border-color:var(--accent)}
.callout{border-left:4px solid var(--accent2);background:var(--surface);padding:14px 18px;border-radius:0 var(--r) var(--r) 0;margin:0 0 1.2em}
.table-wrap{overflow-x:auto;margin:0 0 1.2em}
table{border-collapse:collapse;width:100%;font-size:.95rem}
th,td{border-bottom:1px solid var(--line);padding:9px 10px;text-align:left;vertical-align:top}
th{font-family:var(--hf);background:var(--surface)}
details{border:1px solid var(--line);border-radius:var(--r);padding:10px 16px;background:var(--surface)}
summary{cursor:pointer;font-weight:600}
.steps{counter-reset:s;list-style:none;padding:0}.steps li{counter-increment:s;position:relative;padding-left:44px;margin-bottom:1em}
.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-weight:700;font-size:.9rem}
.btn{display:inline-block;background:var(--accent);color:var(--accent-ink);padding:10px 18px;border-radius:var(--r);text-decoration:none;font-weight:600;border:0;font:inherit;cursor:pointer}
.aff{border:1px dashed var(--accent);border-radius:var(--r);padding:16px 18px;margin:0 0 1.2em;background:var(--surface)}
.aff .tag{font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}
.disclosure{font-size:.88rem;color:var(--muted);border:1px solid var(--line);border-radius:var(--r);padding:10px 14px;margin:0 0 1.6em}
.meta{font-size:.88rem;color:var(--muted)}
dl dt{font-family:var(--hf);font-weight:700;margin-top:1em}dl dd{margin:.2em 0 0 0;color:var(--ink)}
footer.site{border-top:1px solid var(--line);background:var(--surface);font-size:.92rem;color:var(--muted)}
footer.site .wrap{padding-top:32px;padding-bottom:32px;display:grid;gap:18px}
footer.site ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:6px 18px}
footer.site a{color:var(--muted)}
.tt{line-height:1.75}
.tt h1,.tt h2,.tt h3{letter-spacing:-.015em}
.tt header.site{background:var(--surface);border-bottom:0;border-top:6px solid var(--accent);box-shadow:0 2px 0 var(--line)}
.tt .brand{font-weight:700;font-size:1.2rem;letter-spacing:-.02em}
.tt nav.main ul{gap:6px}
.tt nav.main a{font-family:var(--hf);font-size:.9rem;padding:6px 12px;border:0;border-radius:999px;color:var(--ink)}
.tt nav.main a:hover{background:#e3f1fa}
.tt nav.main a[aria-current]{background:var(--accent);color:#fff}
.tt .menu-btn{font-family:var(--hf);border-radius:999px;border-color:var(--accent);color:var(--accent)}
.tt .hero .kicker{display:inline-block;font-family:var(--hf);font-weight:600;font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;color:#7a3a05;background:#ffe3c8;padding:4px 12px;border-radius:999px}
.tt .hero.split{background:linear-gradient(180deg,#d9eefb 0%,#eef7fc 70%,var(--bg) 100%)}
.tt .hero.split .wrap{grid-template-columns:1fr 1fr;padding-top:64px;padding-bottom:72px}
.tt .hero.split img{border:10px solid #fff;border-radius:6px;box-shadow:0 18px 40px rgba(11,103,163,.22);transform:rotate(1.5deg)}
.tt .hero.split h1,.tt .hero.plain h1,.tt .hero.banner h1{color:#0a3a5e}
.tt .hero .lead{color:#30475c}
.tt .hero.plain{background:#e6f3fb;border-bottom:0;background-image:radial-gradient(circle at 100% 0,rgba(242,125,22,.18) 0 140px,transparent 141px)}
.tt .hero.banner{background:#e6f3fb}
.tt .hero.banner img{border-radius:6px;border:8px solid #fff;box-shadow:0 14px 34px rgba(11,103,163,.18)}
.tt .prose h2{font-size:clamp(1.35rem,2.6vw,1.8rem);color:#0a3a5e;padding-bottom:.25em;background:linear-gradient(var(--accent2),var(--accent2)) left bottom/56px 4px no-repeat}
.tt .prose h3{color:#0a3a5e}
.tt .cards{grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px}
.tt .card{border:2px solid var(--line);border-radius:var(--r);padding:22px 22px 18px;box-shadow:0 3px 0 var(--line)}
.tt a.card:hover{border-color:var(--accent);box-shadow:0 3px 0 var(--accent)}
.tt .card h3{font-size:1.1rem;margin:.5em 0 .4em;color:#0a3a5e}
.tt .card p{font-size:.93rem;color:var(--muted)}
.tt .who{display:inline-block;font-family:var(--hf);font-size:.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:#fff;background:var(--accent);padding:3px 10px;border-radius:999px}
.tt .who.par{background:#a84d00}
.tt .who.both{background:#0a3a5e}
.tt .callout{border-left:0;background:#fff4e8;border:2px dashed #f5b47a;border-radius:var(--r);padding:16px 20px}
.tt th{font-family:var(--hf);background:#0a3a5e;color:#fff;font-weight:600}
.tt td{background:var(--surface)}
.tt .table-wrap{border-radius:12px;border:2px solid var(--line)}
.tt .steps li::before{background:var(--accent2);color:#2b1300;border-radius:8px;font-family:var(--hf)}
.tt ul.ticks{list-style:none;padding:0}
.tt ul.ticks li{position:relative;padding-left:34px;margin-bottom:.7em}
.tt ul.ticks li::before{content:"";position:absolute;left:0;top:.3em;width:20px;height:20px;border:2px solid var(--accent);border-radius:5px;background:#fff}
.tt ul.ticks li::after{content:"";position:absolute;left:6px;top:.55em;width:6px;height:10px;border:solid var(--accent2);border-width:0 3px 3px 0;transform:rotate(45deg)}
.lessons{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px;margin:0 0 1.6em}
.lesson{position:relative;background:#fff;border-radius:4px;padding:0 22px 16px 46px;box-shadow:0 1px 0 #c9d9e5,0 10px 24px rgba(10,58,94,.10);background-image:linear-gradient(90deg,transparent 33px,#f6b8b8 33px,#f6b8b8 35px,transparent 35px),repeating-linear-gradient(180deg,transparent 0,transparent 27px,#e2eef6 27px,#e2eef6 28px);background-position:0 0,0 66px}
.lesson header{margin:0 -22px 12px -46px;padding:16px 22px 12px 46px;background:#e6f3fb;border-bottom:3px solid var(--accent);border-radius:4px 4px 0 0}
.lesson .ltag{position:absolute;top:-12px;right:18px;font-family:var(--hf);font-size:.75rem;font-weight:700;background:var(--accent2);color:#2b1300;padding:3px 12px;border-radius:6px;transform:rotate(-2deg)}
.lesson h3{margin:0 0 .3em;font-size:1.12rem;color:#0a3a5e}
.lesson .lmeta{margin:0;display:flex;gap:8px;flex-wrap:wrap}
.lesson .lmeta span{font-family:var(--hf);font-size:.78rem;background:#fff;border:1px solid var(--line);padding:1px 9px;border-radius:999px;color:var(--muted)}
.lesson .lrow{font-size:.93rem;margin:0 0 .5em}
.lesson .lrow b{display:block;font-family:var(--hf);font-size:.74rem;text-transform:uppercase;letter-spacing:.09em;color:var(--accent)}
.lesson ol{font-size:.93rem;padding-left:1.2em;margin-bottom:.8em}
.lesson ol li{margin-bottom:.3em}
.lesson .lcheck{border-top:2px dotted var(--line);padding-top:.6em}
.tt dl dt{color:#0a3a5e}
.tt footer.site{background:#0a3a5e;color:#d6e6f2;border-top:6px solid var(--accent2)}
.tt footer.site a{color:#ffd2a8}
.tt .page.toc-layout .toc{border-left:0;background:#fff;border:2px solid var(--line);border-radius:14px;padding:14px 16px}
.tt .page.toc-layout .toc strong{font-family:var(--hf);font-size:.85rem;color:var(--accent)}
@media(max-width:760px){.tt .hero.split .wrap{grid-template-columns:1fr;padding-top:36px;padding-bottom:40px}.tt .hero.split img{transform:none}.lesson{padding-left:40px}.lesson header{margin-left:-40px;padding-left:40px}}