:root{--bg:#f4f5f3;--surface:#ffffff;--ink:#1f2427;--muted:#4c565e;--accent:#1d5d8a;--accent-ink:#ffffff;--accent2:#d9a520;--line:#d8dcd9;--hero-ink:#ffffff;--r:6px;--maxw:1200px;--measure:68ch;--hf:'Amaranth', 'Trebuchet MS', sans-serif;--bf:'Lato', system-ui, sans-serif}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/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,3.5rem);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)}
.ds{font-size:17px}
.ds header.site{background:#2d3236;border-bottom:0;position:relative}
.ds header.site::after{content:"";display:block;height:6px;background:repeating-linear-gradient(90deg,#d9a520 0 34px,transparent 34px 56px) #2d3236}
.ds .brand{color:#fff;font-size:1.45rem}
.ds nav.main a{color:#e6e9e7;font-weight:700;font-size:.92rem}
.ds nav.main a:hover{color:#fff;border-color:#8fb8d6}
.ds nav.main a[aria-current]{border-color:#d9a520;color:#fff}
.ds .menu-btn{color:#fff;border-color:#69737a}
.ds .hero.plain,.ds .hero.banner{background:linear-gradient(180deg,#e8eef2,#f4f5f3);border-bottom:0}
.ds .hero .kicker{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:#1d5d8a;margin-bottom:.8em}
.ds .hero .kicker::before{content:"";width:26px;height:4px;background:#d9a520;border-radius:2px}
.ds .hero h1{color:#173f5f;max-width:22ch}
.ds .hero .lead{color:#3f4a52;max-width:62ch}
.ds .hero.banner img{border-radius:6px;border-bottom:6px solid #d9a520;max-height:460px}
.ds .road{height:74px;margin-top:28px;border-radius:6px;background:#3a4045;position:relative;overflow:hidden;box-shadow:inset 0 6px 0 #f4f5f3,inset 0 8px 0 #fff,inset 0 -6px 0 #f4f5f3,inset 0 -8px 0 #fff}
.ds .road i{position:absolute;left:0;right:0;top:35px;height:4px;background:repeating-linear-gradient(90deg,#d9a520 0 48px,transparent 48px 84px);animation:ds-roll 3s linear infinite}
@keyframes ds-roll{to{background-position:-84px 0}}
@media(prefers-reduced-motion:reduce){.ds .road i{animation:none}}
.ds .prose h2{color:#173f5f;display:flex;align-items:center;gap:12px}
.ds .prose h2::before{content:"";flex:none;width:8px;height:1.05em;background:#d9a520;border-radius:2px}
.ds .prose h3{color:#1d5d8a}
.ds .callout{border-left-color:#d9a520;background:#fbf6e7}
.ds th{background:#2d3236;color:#fff;font-size:.88rem;letter-spacing:.02em}
.ds tbody tr:nth-child(even){background:#f8f9f8}
.ds details{border-left:4px solid #1d5d8a}
.ds summary{color:#173f5f}
.ds .steps li::before{background:#2d3236;color:#fff;border-radius:4px;box-shadow:0 3px 0 #d9a520}
.ds figure{margin:0 0 1.4em}.ds figcaption{font-size:.86rem;color:var(--muted);margin-top:.5em}
.ds figure.ph img{border-radius:6px;width:100%;max-height:520px;object-fit:cover}
.ds .net{background:#fff;border:1px solid var(--line);border-radius:8px;padding:14px 16px 12px;box-shadow:0 2px 0 #e3e6e4}
.ds .net-scroll{overflow-x:auto}.ds .net-hint{display:none;margin:.4em 0 0;font-size:.84rem;font-weight:700;color:#1d5d8a}@media(max-width:700px){.ds .net-hint{display:block}}
.ds article.prose>h2:first-child,.ds article.prose>.rail+h2{margin-top:0}
.ds .net svg{display:block;width:100%;min-width:680px;height:auto}
.ds .net .river{fill:none;stroke:#9cc7e4;stroke-width:16;stroke-linecap:round}.ds .net .river.am{stroke-width:11}
.ds .net .rl{font:italic 700 14px Lato,sans-serif;fill:#3f7aa6}
.ds .net .dt{fill:#fbf3da;stroke:#d9a520;stroke-width:2;stroke-dasharray:5 4}
.ds .net .dtl{font:700 17px Amaranth,sans-serif;fill:#173f5f}.ds .net .dtl.s{font:400 13px Lato,sans-serif;fill:#4c565e}
.ds .net .case{fill:none;stroke:#fff;stroke-width:13;stroke-linejoin:round;stroke-linecap:round}
.ds .net .ln{fill:none;stroke-width:8;stroke-linejoin:round;stroke-linecap:round}
.ds .net .conc{fill:none;stroke:#1f6b45;stroke-width:2.5;stroke-dasharray:6 6}
.ds .net .jn{fill:#fff;stroke:#2d3236;stroke-width:3}
.ds .net .end{fill:#2d3236}
.ds .net .el{font:700 14px Lato,sans-serif;fill:#2d3236;paint-order:stroke;stroke:#fff;stroke-width:4px}
.ds .net .rt{transition:opacity .2s}.ds .net svg:hover .rt{opacity:.45}.ds .net svg .rt:hover{opacity:1}
.ds .routes{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;margin:0 0 1.6em}
.ds .route{background:#fff;border:1px solid var(--line);border-top:6px solid var(--rc);border-radius:6px;padding:16px 18px}
.ds .route header{display:flex;align-items:center;gap:12px;margin-bottom:.6em}
.ds .route h3{margin:0;font-size:1.25rem;color:#173f5f}
.ds .route .aka{margin:0;font-size:.82rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.ds .route p,.ds .route li{font-size:.95rem}
.ds .route ul{padding-left:1.1em;margin-bottom:.8em}
.ds .route .meets{border-top:1px dashed var(--line);padding-top:.6em;margin:0;color:#3f4a52}
.ds .guides{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px;margin:0 0 1.6em}
.ds a.guide{display:block;background:#fff;border:1px solid var(--line);border-radius:6px;padding:16px 18px 14px;color:var(--ink);text-decoration:none;position:relative;transition:border-color .15s,transform .15s}
.ds a.guide::after{content:"";position:absolute;left:18px;right:18px;bottom:0;height:3px;background:repeating-linear-gradient(90deg,#d9a520 0 16px,transparent 16px 26px);opacity:0;transition:opacity .15s}
.ds a.guide:hover{border-color:#1d5d8a;transform:translateY(-2px)}.ds a.guide:hover::after{opacity:1}
.ds .gs{display:flex;gap:4px;min-height:28px}
.ds .gs .lane{width:44px;height:28px;border-radius:4px;background:#3a4045 linear-gradient(90deg,transparent 19px,#d9a520 19px 25px,transparent 25px)}
.ds a.guide h3{margin:.5em 0 .3em;font-size:1.2rem;color:#173f5f}
.ds a.guide p{margin:0;color:var(--muted);font-size:.94rem}
.ds .year{background:#fff;border:1px solid var(--line);border-radius:8px;padding:14px 16px;margin:0 0 1.6em;overflow-x:auto}
.ds .yr{display:grid;grid-template-columns:minmax(150px,1.6fr) repeat(12,minmax(26px,1fr));gap:4px;align-items:center;min-width:560px;margin-bottom:4px}
.ds .yl{font-size:.9rem;font-weight:700}.ds a.yl{color:#173f5f}
.ds .ym{font-size:.74rem;font-weight:700;text-align:center;color:var(--muted);text-transform:uppercase}
.ds .yc{height:22px;border-radius:3px;background:#eef0ee;display:block}
.ds .yc.fog.on{background:#cfd6dc}.ds .yc.fog.pk{background:#8b98a4}
.ds .yc.rain.on{background:#b9d6ea}.ds .yc.rain.pk{background:#4f8fbe}
.ds .yc.snow.on{background:#d9e3ec}.ds .yc.snow.pk{background:#9fb5c9}
.ds .yc.heat.on{background:#f2d995}.ds .yc.heat.pk{background:#d9a520}
.ds .ykey{margin:.6em 0 0;font-size:.84rem;color:var(--muted);display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.ds .ykey .yc{width:22px;height:14px;display:inline-block;background:#8b98a4}.ds .ykey .yc.on{background:#cfd6dc}
.ds .rail{background:#fff;border:1px solid var(--line);border-radius:8px;padding:14px 16px;margin:0 0 1.6em;font-size:.92rem;max-width:47.5rem}
.ds .rail .rh{font-weight:700;font-size:.76rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 .5em}
.ds .rail ul{list-style:none;padding:0;margin:0 0 1em}.ds .rail ul:last-child{margin:0}
.ds .rail .rs{display:flex;flex-wrap:wrap;gap:8px 16px}
.ds .rail .rs li{display:flex;align-items:center;gap:6px}
.ds .rail .src li{margin:0 0 .55em}.ds .rail .src span{display:block;color:var(--muted);font-size:.84rem}
.ds .page.toc-layout .toc{border-left-color:#d9a520}
.ds .page.toc-layout .toc strong{font-family:var(--hf);color:#173f5f}
.ds dl.terms{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:4px 28px}
.ds dl.terms div{border-top:2px solid #d9a520;padding-top:.4em}.ds dl.terms dt{margin-top:0;color:#173f5f}
.ds footer.site{background:#2d3236;color:#d5dad7;border-top:0}
.ds footer.site::before{content:"";display:block;height:6px;background:repeating-linear-gradient(90deg,#d9a520 0 34px,transparent 34px 56px) #1d5d8a}
.ds footer.site a{color:#f0d68a}
@media(min-width:1400px){.ds .page.toc-layout{grid-template-columns:230px minmax(0,1fr)}
.ds .page.toc-layout article.prose{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,340px);column-gap:56px;align-content:start}
.ds .page.toc-layout article.prose>*{grid-column:1}
.ds .page.toc-layout article.prose>.rail{grid-column:2;grid-row:1/span 120;align-self:start;position:sticky;top:20px;max-width:none}}
.ds .p-index .page{padding-top:8px}
@media(min-width:1800px){.ds .net svg{max-width:1280px;margin:0 auto}.ds .page.toc-layout article.prose{grid-template-columns:minmax(0,1fr) 400px}.ds .hero.banner img{max-height:560px}.ds .road{height:96px}.ds .road i{top:46px}}
@media(max-width:760px){.ds .route header{align-items:flex-start}.ds .hero h1{font-size:2.1rem}}