:root{--paper:#FFFFFF;--card:#FFF;--ink:#0A0A0B;--muted:#6B6B73;--soft:#3C3C43;--line:#E6E6EA;--line-strong:#D4D4DA;--bg2:#F5F5F7;--radius:16px}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{font-family:'Inter',system-ui,sans-serif;background:var(--paper);color:var(--ink);-webkit-font-smoothing:antialiased}
a{color:inherit}
img,svg{display:block}
.top{height:56px;display:flex;align-items:center;gap:10px;padding:0 18px;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);z-index:10}
.brand{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--ink);flex-shrink:0}
.brand .name{font-weight:600;font-size:16px}
.navlinks{margin-left:auto;display:flex;gap:2px}
.navlinks a{font-size:13.5px;color:var(--muted);text-decoration:none;padding:8px 12px;border-radius:9px;white-space:nowrap}
.navlinks a:hover{background:#F3F3F5;color:var(--ink)}
.crumbs{max-width:1080px;margin:0 auto;padding:18px 24px 0;font-size:13px;color:var(--muted)}
.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--ink);text-decoration:underline}
.crumbs span{margin:0 6px;opacity:.6}
.wrap{max-width:1080px;margin:0 auto;padding:22px 24px 10px}
h1{font-weight:600;font-size:clamp(28px,4vw,40px);letter-spacing:-.02em;line-height:1.1}
.lead{color:var(--soft);font-weight:300;font-size:16px;line-height:1.6;margin-top:12px;max-width:720px}
.sec{max-width:1080px;margin:0 auto;padding:22px 24px}
.sec>h2,.prose h2{font-weight:600;font-size:22px;letter-spacing:-.01em;margin:6px 0 14px}
.sec>p.sub{color:var(--muted);font-size:14px;margin:-8px 0 14px;font-weight:300;line-height:1.5}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform .16s,box-shadow .16s}
.card:hover{transform:translateY(-3px);box-shadow:0 14px 30px -12px rgba(10,10,11,.22)}
.strip{display:flex;height:104px}
.sw{flex:1;cursor:pointer;display:flex;align-items:flex-end;justify-content:center;position:relative;border:0;font:inherit}
.sw .h{font-size:10.5px;font-weight:500;padding:0 0 8px;opacity:0;transition:opacity .15s;text-transform:uppercase}
.sw:hover .h,.sw:focus-visible .h{opacity:1}
.sw.dark .h,.sw.dark .cp{color:#fff}.sw.light .h,.sw.light .cp{color:rgba(0,0,0,.75)}
.sw .cp{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:10px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;opacity:0;pointer-events:none;transition:opacity .2s}
.sw.copied .cp{opacity:1}.sw.copied .h{opacity:0}
.foot{display:flex;align-items:center;gap:4px;padding:9px 12px;min-height:50px}
.tag{font-size:12.5px;color:var(--ink);font-weight:500;line-height:1.3}
.note{font-size:12.5px;color:var(--muted);font-weight:300;line-height:1.45;padding:0 12px 12px;margin-top:-4px}
.acts{margin-left:auto;display:flex;gap:2px;flex-shrink:0}
.ib{border:0;background:transparent;cursor:pointer;color:var(--muted);width:34px;height:34px;border-radius:9px;display:flex;align-items:center;justify-content:center;text-decoration:none}
.ib:hover{background:#F3F3F5;color:var(--ink)}
/* color hero */
.hero{max-width:1080px;margin:0 auto;padding:22px 24px 6px;display:grid;grid-template-columns:1.1fr 1fr;gap:28px;align-items:stretch}
.big{border-radius:20px;min-height:280px;display:flex;align-items:flex-end;padding:22px;border:1px solid rgba(0,0,0,.06)}
.big b{font-size:26px;font-weight:600;letter-spacing:-.01em}
.codes{display:flex;flex-direction:column;gap:8px;justify-content:center}
.code{display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:12px;padding:11px 14px;cursor:pointer;background:#fff;font:inherit;text-align:left;color:inherit;width:100%}
.code:hover{border-color:var(--line-strong);background:#FAFAFB}
.code .k{font-size:12px;color:var(--muted);width:52px;font-weight:500;letter-spacing:.04em}
.code .v{font-size:15px;font-weight:500;flex:1;font-variant-numeric:tabular-nums}
.code svg{color:var(--muted)}
.aka{font-size:14px;color:var(--muted);margin-top:10px;font-weight:300}
/* ramps */
.ramp{display:flex;border-radius:14px;overflow:hidden;border:1px solid var(--line)}
.ramp .sw{height:84px}
.ramp .sw .h{opacity:1}
.ramp .sw.cur{flex:1.4}
.harm{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.hcard{border:1px solid var(--line);border-radius:14px;overflow:hidden}
.hcard .strip{height:70px}
.hcard .sw .h{opacity:1}
.hcard .lbl{padding:10px 12px;font-size:13.5px;font-weight:500;display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap}
.hcard .lbl small{font-weight:300;color:var(--muted);font-size:12.5px}
.hcard .lbl a{color:var(--muted)}
/* chips list */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip-l{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line);border-radius:999px;padding:6px 12px 6px 6px;text-decoration:none;font-size:13.5px;background:#fff}
.chip-l:hover{border-color:var(--line-strong);background:#FAFAFB}
.chip-l i,.chip{display:inline-block;width:20px;height:20px;border-radius:50%;border:1px solid rgba(0,0,0,.08);flex-shrink:0;vertical-align:-4px}
.chip{width:14px;height:14px;margin-right:6px;vertical-align:-2px}
/* contrast */
.ctr{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.ctr div{border-radius:14px;padding:20px;border:1px solid var(--line)}
.ctr strong{display:block;font-size:20px;font-weight:600;margin-bottom:4px}
.ctr span{font-size:13px;opacity:.85}
/* best list */
.best{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.best a,.best div.it{display:flex;gap:12px;align-items:flex-start;border:1px solid var(--line);border-radius:14px;padding:12px;text-decoration:none}
.best a:hover{border-color:var(--line-strong)}
.best i{width:44px;height:44px;border-radius:10px;flex-shrink:0;border:1px solid rgba(0,0,0,.06)}
.best b{font-size:14px;font-weight:600;display:block}
.best small{font-size:12.5px;color:var(--muted);font-weight:300;line-height:1.4;display:block;margin-top:2px}
.pairhero{display:flex;height:120px;border-radius:18px;overflow:hidden;margin-top:18px;border:1px solid rgba(0,0,0,.06)}
.pairhero div{flex:1;display:flex;align-items:flex-end;padding:14px;font-weight:600;font-size:15px}
/* hubs */
.tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.tile{border:1px solid var(--line);border-radius:14px;overflow:hidden;text-decoration:none;background:#fff;transition:transform .16s,box-shadow .16s}
.tile:hover{transform:translateY(-2px);box-shadow:0 12px 26px -14px rgba(10,10,11,.25)}
.tile .strip{height:64px}
.tile .strip span{flex:1}
.tile b{display:block;padding:10px 12px;font-size:14px;font-weight:500}
.cgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.cgrid a{border:1px solid var(--line);border-radius:12px;overflow:hidden;text-decoration:none;background:#fff}
.cgrid a:hover{border-color:var(--line-strong)}
.cgrid i{display:block;height:70px}
.cgrid b{display:block;font-size:13.5px;font-weight:500;padding:8px 10px 0}
.cgrid small{display:block;font-size:12px;color:var(--muted);padding:2px 10px 9px;text-transform:uppercase}
/* prose */
.prose{max-width:740px;margin:0 auto;padding:16px 24px 40px}
.prose h2{margin-top:30px}
.prose h3{font-weight:600;font-size:17px;margin:20px 0 6px}
.prose p,.prose li{font-weight:300;font-size:15.5px;line-height:1.75;color:var(--soft)}
.prose p{margin-bottom:12px}
.prose ul{margin:0 0 14px 20px}
.prose li{margin-bottom:6px}
.prose strong{font-weight:600;color:var(--ink)}
.prose a{text-decoration:underline;text-underline-offset:2px}
.faq details{border-bottom:1px solid var(--line);padding:14px 0}
.faq summary{cursor:pointer;font-weight:500;font-size:15.5px;list-style:none;display:flex;justify-content:space-between;gap:10px}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:'+';color:var(--muted);font-weight:300;font-size:20px;line-height:1}
.faq details[open] summary:after{content:'–'}
.faq details p{margin:8px 0 0}
.cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:11px 20px;font-size:14px;font-weight:500;text-decoration:none;border:1px solid var(--ink);background:var(--ink);color:#fff}
.btn.ghost{background:#fff;color:var(--ink);border-color:var(--line-strong)}
.related{display:flex;flex-wrap:wrap;gap:8px}
.related a{font-size:13.5px;border:1px solid var(--line);border-radius:999px;padding:7px 13px;text-decoration:none;color:var(--soft)}
.related a:hover{border-color:var(--line-strong);color:var(--ink)}
pre.css{background:var(--bg2);border-radius:12px;padding:14px 16px;font-size:13px;overflow:auto;line-height:1.6;position:relative}
.copybtn{position:absolute;top:8px;right:8px;border:1px solid var(--line-strong);background:#fff;border-radius:8px;font:inherit;font-size:12px;padding:5px 10px;cursor:pointer}
.toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:11px 20px;border-radius:12px;font-size:13px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:40}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.disclaimer{font-size:12.5px;color:var(--muted);font-weight:300;margin-top:10px;line-height:1.5}
/* footer (same as site) */
.site-foot{background:var(--ink);color:#EDEDF0;margin-top:30px}
.foot-inner{max-width:1080px;margin:0 auto;padding:46px 24px 26px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr .8fr;gap:30px}
.foot-brand{max-width:280px}
.fb-top{display:flex;align-items:center;gap:9px;margin-bottom:12px}
.fb-top span{font-weight:600;font-size:17px;color:#fff}
.foot-brand p{font-size:13px;font-weight:300;line-height:1.65;color:#B4B4BB}
.foot-col h4{font-size:12px;letter-spacing:.09em;text-transform:uppercase;color:#8A8A92;margin-bottom:12px;font-weight:500}
.foot-col a{display:block;font-size:14px;color:#D4D4DA;text-decoration:none;padding:5px 0;font-weight:300}
.foot-col a:hover{color:#fff}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);max-width:1080px;margin:0 auto;padding:18px 24px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px 20px;font-size:13px;color:#8A8A92}
.foot-bottom a{color:#D4D4DA;text-decoration:none}.foot-bottom a:hover{color:#fff}
/* converter */
.conv{display:grid;grid-template-columns:1fr 1.2fr;gap:24px;align-items:start}
.conv .big{min-height:260px}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:12px}
.field label{font-size:12px;color:var(--muted);font-weight:500;letter-spacing:.04em}
.field .row{display:flex;gap:8px}
.field input{flex:1;font:inherit;font-size:15px;border:1px solid var(--line-strong);border-radius:10px;padding:11px 12px;min-width:0}
.field input:focus{outline:2px solid #38BDF8;outline-offset:-1px}
.field button{border:1px solid var(--line-strong);background:#fff;border-radius:10px;padding:0 14px;cursor:pointer;font:inherit;font-size:13px}
input[type=color],.field input[type=color]{flex:none;width:100%;height:46px;border:1px solid var(--line-strong);border-radius:10px;padding:3px;background:#fff;cursor:pointer}
@media(max-width:820px){
 .navlinks{overflow-x:auto;flex:1;margin-left:6px;-webkit-overflow-scrolling:touch;scrollbar-width:none}.navlinks a{padding:8px 10px;font-size:13px}
 .brand .name{display:none}
 .crumbs,.wrap,.sec,.hero{padding-left:16px;padding-right:16px}
 .hero,.conv{grid-template-columns:1fr}
 .big{min-height:180px}
 .grid{grid-template-columns:1fr 1fr;gap:12px}
 .sw .h{opacity:1}
 .prose{padding:12px 16px 34px}
 .foot-inner{grid-template-columns:1fr 1fr;gap:22px;padding:34px 16px 22px}
 .foot-brand{grid-column:1/-1;max-width:none}
 .foot-bottom{flex-direction:column;gap:8px;text-align:center}
 .ramp .sw .h{font-size:8.5px;writing-mode:vertical-rl;transform:rotate(180deg);padding:0 0 6px}
}
@media(max-width:480px){.grid{grid-template-columns:1fr}.ctr{grid-template-columns:1fr}.harm{grid-template-columns:1fr}}