:root{
  --bg:#fff8f3;--bg2:#ffffff;--ink:#1d1630;--muted:#6b6380;--line:#efe4dc;
  --brand:#ff5a36;--brand2:#7c3aed;--brand-soft:#fff0ea;--ok:#0e9f6e;
  --card:#ffffffcc;--shadow:0 20px 50px -20px rgba(78,40,120,.25),0 4px 14px -6px rgba(255,90,54,.15);
  --radius:22px;--grad:linear-gradient(120deg,#ff5a36 0%,#ff2e88 50%,#7c3aed 100%);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#120e1d;--bg2:#1a1528;--ink:#f4f0ff;--muted:#a79fbd;--line:#2c2540;
  --brand-soft:#2a1a2a;--card:#1c1630dd;--shadow:0 20px 50px -20px rgba(0,0,0,.6);color-scheme:dark}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:"Plus Jakarta Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.65;font-size:17px;overflow-x:hidden}
body::before{content:"";position:fixed;inset:-20% -10% auto -10%;height:720px;z-index:-1;pointer-events:none;
  background:radial-gradient(600px 380px at 15% 20%,rgba(255,90,54,.18),transparent 70%),
  radial-gradient(520px 360px at 85% 10%,rgba(124,58,237,.16),transparent 70%),
  radial-gradient(500px 300px at 55% 60%,rgba(255,46,136,.10),transparent 70%)}
a{color:var(--brand2);text-decoration-thickness:1.5px;text-underline-offset:3px}
@media (prefers-color-scheme:dark){a{color:#c4a8ff}}
img,svg{max-width:100%}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;border-radius:8px;z-index:99}

/* header */
.site-head{position:sticky;top:0;z-index:20;backdrop-filter:saturate(1.6) blur(14px);
  background:color-mix(in srgb,var(--bg) 78%,transparent);border-bottom:1px solid var(--line)}
.head-in{display:flex;align-items:center;gap:18px;height:66px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;font-size:20px;letter-spacing:-.02em;flex-shrink:0}
.logo b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;margin-left:auto}
.nav::-webkit-scrollbar{display:none}
.nav a{white-space:nowrap;text-decoration:none;color:var(--ink);font-weight:600;font-size:15px;padding:8px 13px;border-radius:999px}
.nav a:hover,.nav a[aria-current]{background:var(--brand-soft);color:var(--brand)}
@media (max-width:720px){.head-in{height:auto;flex-wrap:wrap;padding:10px 0 6px;gap:6px}.nav{width:100%;margin:0 -6px}}

/* hero */
.hero{padding:44px 0 10px;text-align:center}
.crumbs{font-size:14px;color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--brand)}
.hero h1{font-size:clamp(32px,5.4vw,56px);line-height:1.08;letter-spacing:-.035em;margin:0 0 14px;font-weight:800}
.hero h1 span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{max-width:640px;margin:0 auto;color:var(--muted);font-size:18px}
.pill{display:inline-flex;gap:8px;align-items:center;font-size:13px;font-weight:700;padding:6px 12px;border-radius:999px;
  background:var(--bg2);border:1px solid var(--line);color:var(--muted);margin-bottom:16px}
.pill i{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px rgba(14,159,110,.15)}

/* converter */
.conv{max-width:820px;margin:30px auto 0;background:var(--card);backdrop-filter:blur(18px);border:1px solid var(--line);
  border-radius:28px;box-shadow:var(--shadow);padding:26px;text-align:left;position:relative}
.conv::before{content:"";position:absolute;inset:-1px;border-radius:29px;padding:1px;background:var(--grad);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:.55;pointer-events:none}
.row{display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:end}
.row.single{grid-template-columns:1fr}
.field label{display:block;font-size:13px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin:0 0 8px 4px}
.inbox{display:flex;align-items:center;min-height:74px;background:var(--bg2);border:2px solid var(--line);border-radius:18px;transition:.2s}
.inbox:focus-within{border-color:var(--brand);box-shadow:0 0 0 5px rgba(255,90,54,.14)}
.inbox input{flex:1;min-width:0;border:0;background:transparent;font:inherit;font-size:30px;font-weight:800;padding:14px 16px;color:var(--ink);outline:none;letter-spacing:-.02em}
.inbox .u{padding:0 18px;font-weight:800;color:var(--muted);font-size:17px}
.outbox{background:var(--grad);color:#fff;border-radius:18px;padding:12px 18px;min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:10px}
.outbox .val{font-size:30px;font-weight:800;letter-spacing:-.02em;line-height:1.1}
.outbox .val small{font-size:17px;font-weight:700;opacity:.9;margin-left:4px}
.copy{border:0;background:rgba(255,255,255,.2);color:#fff;font:inherit;font-size:13px;font-weight:700;border-radius:10px;padding:7px 10px;cursor:pointer}
.copy:hover{background:rgba(255,255,255,.32)}
.swap{width:52px;height:52px;border-radius:50%;display:grid;place-items:center;background:var(--bg2);border:2px solid var(--line);
  color:var(--ink);text-decoration:none;font-size:22px;margin-bottom:8px;transition:.25s}
.swap:hover{transform:rotate(180deg);border-color:var(--brand);color:var(--brand)}
.swap.ghost{visibility:hidden}
.ing{margin-top:18px}
select{width:100%;font:inherit;font-weight:700;font-size:17px;color:var(--ink);background:var(--bg2);border:2px solid var(--line);border-radius:16px;padding:13px 44px 13px 16px;appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23ff5a36' stroke-width='3'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 16px center;cursor:pointer}
select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 5px rgba(255,90,54,.14)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.chip{border:1.5px solid var(--line);background:var(--bg2);color:var(--ink);font:inherit;font-size:14px;font-weight:700;padding:7px 13px;border-radius:999px;cursor:pointer;transition:.15s}
.chip:hover{border-color:var(--brand);color:var(--brand)}
.chip.on{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.chips .lbl{font-size:13px;color:var(--muted);font-weight:700;align-self:center;margin-right:2px}
.extra{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:18px}
.extra div{background:var(--bg2);border:1px solid var(--line);border-radius:14px;padding:10px 12px}
.extra b{display:block;font-size:19px;letter-spacing:-.01em}
.extra span{font-size:12.5px;color:var(--muted);font-weight:700;text-transform:uppercase;letter-spacing:.05em}
.sentence{margin:16px 2px 0;font-size:16px;color:var(--muted)}
.sentence strong{color:var(--ink)}
@media (max-width:720px){
  .conv{padding:18px;border-radius:22px}
  .row{grid-template-columns:1fr;gap:10px}
  .swap{margin:0 auto;transform:rotate(90deg);width:44px;height:44px}
  .swap:hover{transform:rotate(270deg)}
  .extra{grid-template-columns:repeat(2,1fr)}
  .inbox input,.outbox .val{font-size:26px}
}

/* sections */
main{padding-bottom:40px}
.sec{margin:64px auto 0;max-width:820px}
.sec.wide{max-width:1120px}
.sec h2{font-size:clamp(24px,3.2vw,32px);letter-spacing:-.025em;line-height:1.2;margin:0 0 14px}
.sec h3{font-size:20px;letter-spacing:-.01em;margin:26px 0 8px}
.sec p,.sec li{color:color-mix(in srgb,var(--ink) 86%,var(--muted))}
.formula{background:var(--brand-soft);border-left:5px solid var(--brand);border-radius:14px;padding:16px 20px;font-weight:700;margin:18px 0}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:18px;background:var(--bg2);margin:18px 0}
table{border-collapse:collapse;width:100%;font-size:15.5px}
th,td{padding:11px 16px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}
th{font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);background:color-mix(in srgb,var(--bg) 60%,var(--bg2))}
tr:last-child td{border-bottom:0}
tbody tr:hover td{background:var(--brand-soft)}
td a{font-weight:700;text-decoration:none}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin-top:18px}
.tcard{display:flex;gap:14px;align-items:center;text-decoration:none;color:var(--ink);background:var(--bg2);border:1px solid var(--line);
  border-radius:18px;padding:16px;transition:.2s}
.tcard:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:transparent}
.tcard .ic{width:44px;height:44px;border-radius:13px;display:grid;place-items:center;background:var(--grad);color:#fff;font-weight:800;font-size:15px;flex-shrink:0}
.tcard b{display:block;font-size:16px;line-height:1.3}
.tcard span{font-size:13.5px;color:var(--muted)}
.faq details{background:var(--bg2);border:1px solid var(--line);border-radius:16px;padding:4px 20px;margin:10px 0}
.faq summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;color:var(--brand);line-height:1}
.faq details[open] summary::after{content:"–"}
.faq details p{margin:0 0 16px}
.note{font-size:14.5px;color:var(--muted)}
.steps{counter-reset:s;list-style:none;padding:0}
.steps li{counter-increment:s;position:relative;padding:4px 0 10px 46px}
.steps li::before{content:counter(s);position:absolute;left:0;top:2px;width:32px;height:32px;border-radius:10px;background:var(--grad);color:#fff;font-weight:800;display:grid;place-items:center;font-size:15px}
.prose{max-width:760px;margin:40px auto 0}
.prose h1{font-size:clamp(30px,4.5vw,44px);letter-spacing:-.03em;line-height:1.1}

/* footer */
.site-foot{margin-top:80px;border-top:1px solid var(--line);background:var(--bg2);padding:46px 0 30px;font-size:15px}
.fgrid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:28px}
.fgrid h4{margin:0 0 10px;font-size:13px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted)}
.fgrid ul{list-style:none;margin:0;padding:0}
.fgrid li{margin:6px 0}
.fgrid a{color:var(--ink);text-decoration:none}.fgrid a:hover{color:var(--brand)}
.fbot{margin-top:34px;padding-top:18px;border-top:1px solid var(--line);color:var(--muted);font-size:14px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
.fbot a{color:var(--muted)}
@media (max-width:820px){.fgrid{grid-template-columns:1fr 1fr}}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(80px);background:var(--ink);color:var(--bg);padding:10px 18px;border-radius:12px;font-weight:700;font-size:14px;transition:.3s;z-index:50}
.toast.show{transform:translateX(-50%) translateY(0)}

/* blog */
.bloghead{padding:44px 0 6px}
.bloghead h1{font-size:clamp(34px,5vw,52px);letter-spacing:-.035em;margin:0 0 8px;line-height:1.1}
.bloghead .lead{color:var(--muted);font-size:18px;margin:0}
.pgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-top:30px}
@media (max-width:960px){.pgrid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:620px){.pgrid{grid-template-columns:1fr}}
.pcard{background:var(--bg2);border:1px solid var(--line);border-radius:22px;overflow:hidden;display:flex;flex-direction:column;transition:.25s}
.pcard:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.pimg{display:block;aspect-ratio:16/10;overflow:hidden;background:var(--brand-soft)}
.pimg img{width:100%;height:100%;object-fit:cover;display:block;transition:.4s}
.pcard:hover .pimg img{transform:scale(1.04)}
.ph{width:100%;height:100%;display:grid;place-items:center;background:var(--grad)}
.ph span{font-size:64px;font-weight:800;color:rgba(255,255,255,.9)}
.pbody{padding:20px 22px 24px}
.pcat{display:inline-block;font-size:12.5px;font-weight:800;letter-spacing:.09em;text-transform:uppercase;color:var(--brand);text-decoration:none;margin-bottom:8px}
.pcard h2{font-size:21px;line-height:1.3;letter-spacing:-.015em;margin:0 0 10px}
.pcard h2 a{color:var(--ink);text-decoration:none}
.pcard h2 a:hover{color:var(--brand)}
.pmeta{font-size:14px;color:var(--muted);margin:0 0 10px}
.pex{font-size:15.5px;color:color-mix(in srgb,var(--ink) 80%,var(--muted));margin:0}
.pager{display:flex;justify-content:space-between;align-items:center;margin:36px 0 0;font-weight:700}
.pager a{padding:10px 18px;border-radius:999px;background:var(--bg2);border:1px solid var(--line);text-decoration:none}
.post{max-width:760px;margin:40px auto 0}
.post h1{font-size:clamp(30px,4.6vw,46px);line-height:1.12;letter-spacing:-.03em;margin:0 0 12px}
.feat{width:100%;border-radius:22px;margin:18px 0 8px;aspect-ratio:16/9;object-fit:cover}
.postbody{font-size:18px;line-height:1.75}
.postbody h2{font-size:28px;letter-spacing:-.02em;margin:38px 0 10px;line-height:1.25}
.postbody h3{font-size:22px;margin:28px 0 8px}
.postbody img{max-width:100%;border-radius:16px}
.postbody blockquote{margin:22px 0;padding:14px 20px;border-left:5px solid var(--brand);background:var(--brand-soft);border-radius:12px}
.postbody li{margin:6px 0}
.cta{display:flex;flex-direction:column;gap:4px;margin:40px 0 0;padding:22px 24px;border-radius:20px;background:var(--grad);color:#fff}
.cta a{color:#fff;font-weight:800}