:root{--bg:#ffffff;--tile:#f5f5f7;--tile2:#ffffff;--ink:#1d1d1f;--muted:#6e6e73;--line:#d2d2d7;--accent:#0071e3;--link:#0066cc;--brand:#174c3c;--nav:rgba(22,22,23,.8);--local:rgba(251,251,253,.8);--shadow:0 4px 24px rgba(0,0,0,.06)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#000;--tile:#1d1d1f;--tile2:#161617;--ink:#f5f5f7;--muted:#a1a1a6;--line:#424245;--accent:#0a84ff;--link:#2997ff;--brand:#6fc59b;--local:rgba(22,22,23,.8);--shadow:none}}
:root[data-theme="dark"]{--bg:#000;--tile:#1d1d1f;--tile2:#161617;--ink:#f5f5f7;--muted:#a1a1a6;--line:#424245;--accent:#0a84ff;--link:#2997ff;--brand:#6fc59b;--local:rgba(22,22,23,.8);--shadow:none}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.47 -apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue",Helvetica,Arial,sans-serif;letter-spacing:-.022em;-webkit-font-smoothing:antialiased}
a{color:var(--link);text-decoration:none}a:hover{text-decoration:underline}
a:focus-visible,button:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:6px}
/* global nav */
.gnav{background:var(--nav);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);position:relative;z-index:20}
.gnav .in{max-width:1024px;margin:0 auto;padding-inline:22px;height:44px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.gnav a{color:#e8e8ed;font-size:12px;letter-spacing:-.01em;opacity:.85}.gnav a:hover{opacity:1;text-decoration:none}
.gnav .brand{font-weight:600;font-size:14px;opacity:1}
.gnav nav{display:flex;gap:28px;overflow-x:auto;scrollbar-width:none}.gnav nav a[aria-current]{opacity:1;color:#fff}
/* local nav */
.lnav{position:sticky;top:env(safe-area-inset-top,0px);z-index:15;background:var(--local);-webkit-backdrop-filter:saturate(180%) blur(20px);backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--line)}
.lnav .in{max-width:1024px;margin:0 auto;padding-inline:22px;height:52px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.lnav .t{font-size:21px;font-weight:600;letter-spacing:.011em;color:var(--ink)}
.pill{display:inline-flex;align-items:center;gap:6px;background:var(--accent);color:#fff!important;border-radius:980px;padding:6px 15px;font-size:13px;font-weight:400;letter-spacing:-.01em;white-space:nowrap}.pill:hover{text-decoration:none;filter:brightness(1.08)}
.pill.lg{font-size:17px;padding:12px 24px}
.pill.ghost{background:transparent;color:var(--link)!important;border:1px solid var(--link)}
/* hero */
.hero{text-align:center;padding-block:88px 40px;padding-inline:22px;max-width:980px;margin:0 auto}
.kicker{font-size:21px;font-weight:600;color:var(--brand);letter-spacing:.011em}
h1,h2,h3{font-weight:600;color:var(--ink);text-wrap:balance}
h1{font-size:clamp(44px,7vw,80px);line-height:1.05;letter-spacing:-.015em;margin:8px 0 18px}
.hero p{font-size:clamp(19px,2.2vw,24px);line-height:1.38;color:var(--muted);max-width:720px;margin:0 auto;letter-spacing:.009em}
/* on this page chips */
.toc{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;padding-inline:22px;max-width:980px;margin:6px auto 24px}
.toc b{display:none}
.toc a{background:var(--tile);color:var(--ink);border-radius:980px;padding:9px 18px;font-size:14px;display:inline-flex;gap:8px}.toc a:hover{text-decoration:none;background:var(--line)}
.toc a span{color:var(--muted)}
main{max-width:980px;margin:0 auto;padding-inline:22px;padding-block:0 100px}
article{max-width:820px;margin:0 auto}
article section{padding-top:80px;scroll-margin-top:70px}
h2{font-size:clamp(32px,4.4vw,48px);line-height:1.08;letter-spacing:-.003em;margin:0 0 18px}
h3{font-size:24px;line-height:1.16;letter-spacing:.009em;margin:34px 0 8px}
article p{margin:0 0 16px;color:var(--ink)}article li{margin-bottom:8px}
.lead{font-size:24px;line-height:1.33;color:var(--muted);letter-spacing:.009em}.lead b{color:var(--ink)}
ul,ol{padding-left:22px;margin:0 0 18px}
.note{background:var(--tile);border-radius:18px;padding:24px 28px;margin:24px 0;font-size:17px;color:var(--muted)}.note b{display:block;color:var(--ink);font-size:19px;margin-bottom:6px}
.twocol{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:26px 0}
.box{background:var(--tile);border-radius:18px;padding:28px 30px}.box h3{margin:0 0 12px;font-size:24px}.box ul{margin:0;font-size:16px}.box li{margin-bottom:6px}
.table-wrap{overflow-x:auto;margin:26px 0;background:var(--tile2);border-radius:18px;box-shadow:var(--shadow);border:1px solid var(--line)}
table{border-collapse:collapse;width:100%;min-width:480px;font-size:16px}
th,td{text-align:left;padding:15px 20px;border-bottom:1px solid var(--line);vertical-align:top}tr:last-child td{border-bottom:0}
th{font-size:13px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;background:var(--tile)}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
tr.total td{font-weight:600;font-size:19px;background:var(--tile);border-top:1px solid var(--line)}
.steps{counter-reset:s;list-style:none;padding:0;margin:30px 0}
.steps>li{counter-increment:s;background:var(--tile);border-radius:18px;padding:26px 28px 22px 86px;position:relative;margin-bottom:14px}
.steps>li:before{content:counter(s);position:absolute;left:26px;top:24px;width:40px;height:40px;border-radius:50%;background:var(--ink);color:var(--bg);display:grid;place-items:center;font-weight:600;font-size:17px}
.steps h3{margin:6px 0 6px;font-size:22px}.steps p{margin:0;color:var(--muted)}
.meta{display:flex;flex-wrap:wrap;gap:8px;margin:6px 0 10px}.meta span{font-size:12px;font-weight:600;background:var(--bg);border-radius:980px;padding:4px 11px;color:var(--muted)}
.grades{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:26px 0}
.grade{background:var(--tile);border-radius:18px;padding:22px 24px;display:grid;grid-template-columns:88px 1fr;gap:14px;align-items:start}
.grade b{font-size:40px;font-weight:700;line-height:1;letter-spacing:-.03em;color:var(--brand)}.grade h3{margin:2px 0 4px;font-size:19px}.grade p{margin:0;font-size:15px;color:var(--muted)}
.cta{background:var(--tile);border-radius:28px;padding:56px 30px;margin-top:100px;text-align:center}
.cta h2{margin:0 0 10px;font-size:clamp(30px,4vw,44px)}.cta p{color:var(--muted);margin:0 auto 24px;max-width:520px;font-size:19px}
.cta .btns{display:flex;justify-content:center;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:6px;background:var(--accent);color:#fff;border-radius:980px;padding:12px 24px;font-size:17px;white-space:nowrap}
.next{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px}
.next a,.next span{background:var(--tile);border-radius:18px;padding:20px 24px;font-size:15px;color:var(--muted)}
.next a b{display:block;font-size:19px;color:var(--ink);font-weight:600;margin-top:2px}.next a:hover{text-decoration:none;background:var(--line)}
.next a:last-child{text-align:right}.next span{visibility:hidden}
.foot{background:var(--tile);color:var(--muted);font-size:12px;line-height:1.5;padding-block:22px;padding-inline:22px}
.foot .in{max-width:980px;margin:0 auto;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.foot a{color:var(--ink)}
@media (max-width:734px){body{font-size:16px}.gnav nav{display:none}.hero{padding-block:56px 26px}.twocol,.grades,.next{grid-template-columns:1fr}.steps>li{padding:74px 22px 20px}.steps>li:before{left:22px;top:22px}.lead{font-size:20px}article section{padding-top:56px}.lnav .t{font-size:17px}.next a:last-child{text-align:left}.grade{grid-template-columns:70px 1fr}.grade b{font-size:32px}}
@media print{.gnav,.lnav,.toc,.cta,.next,.foot{display:none}}