*{box-sizing:border-box}
:root{--ink:#111827;--muted:#6b7280;--line:#e5e7eb;--bg:#fafaf9;--accent:#a3e635;--accent-ink:#1a2e05;--warn:#b45309;--ok:#15803d}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg)}
a{color:inherit}
.wrap{max-width:560px;margin:0 auto;padding:20px 18px 48px}
header.top{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}
.logo{font-weight:800;letter-spacing:-.02em;text-decoration:none;display:flex;gap:8px;align-items:center}
.logo i{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:7px;background:var(--ink);color:var(--accent);font-style:normal;font-size:14px}
.navlink{font-size:14px;color:var(--muted)}
h1{font-size:32px;line-height:1.12;letter-spacing:-.03em;margin:8px 0 12px}
h2{font-size:20px;letter-spacing:-.01em;margin:28px 0 10px}
p.lead{font-size:18px;color:#374151;margin:0 0 20px}
.muted{color:var(--muted)}.small{font-size:14px}
.btn{display:inline-flex;justify-content:center;align-items:center;gap:8px;width:100%;padding:15px 18px;border-radius:12px;border:0;background:var(--ink);color:#fff;font-family:inherit;font-weight:600;font-size:17px;line-height:1.1;text-decoration:none;cursor:pointer}
.btn.accent{background:var(--accent);color:var(--accent-ink)}
.btn.ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line)}
.btn.sm{width:auto;padding:9px 12px;font-size:14px;border-radius:9px}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;margin:14px 0}
label{display:block;font-weight:600;font-size:14px;margin:14px 0 6px}
input,textarea,select{width:100%;padding:13px 12px;border:1.5px solid var(--line);border-radius:10px;font-family:inherit;font-size:16px;background:#fff;color:var(--ink)}
input:focus,textarea:focus{outline:2px solid var(--accent);border-color:var(--ink)}
.row{display:flex;gap:10px}.row>*{flex:1}
.check{display:flex;gap:10px;align-items:flex-start;font-weight:500;margin-top:14px}.check input{width:20px;height:20px;margin-top:2px}
.steps{list-style:none;padding:0;margin:0;counter-reset:s}
.steps li{counter-increment:s;padding:10px 0 10px 40px;position:relative;border-bottom:1px solid var(--line)}
.steps li:last-child{border:0}
.steps li:before{content:counter(s);position:absolute;left:0;top:10px;width:28px;height:28px;border-radius:50%;background:var(--ink);color:var(--accent);display:grid;place-items:center;font-weight:700;font-size:14px}
.tl{list-style:none;padding:0;margin:0}.tl li{display:flex;justify-content:space-between;gap:10px;padding:8px 0;border-bottom:1px dashed var(--line);font-size:15px}.tl li:last-child{border:0}
.tag{display:inline-block;font-size:12px;font-weight:700;padding:3px 8px;border-radius:99px;background:#f3f4f6}
.tag.open{background:#fef3c7;color:var(--warn)}.tag.paid{background:#dcfce7;color:var(--ok)}.tag.pro{background:var(--ink);color:var(--accent)}
.alert{padding:12px 14px;border-radius:12px;background:#fef2f2;color:#991b1b;margin:12px 0;font-size:15px}
.notice{padding:12px 14px;border-radius:12px;background:#ecfccb;color:var(--accent-ink);margin:12px 0;font-size:15px}
.price{display:flex;gap:12px}.price .card{flex:1;margin:0}
.big{font-size:40px;font-weight:800;letter-spacing:-.03em;line-height:1}
.inv{display:flex;flex-direction:column;gap:6px}
.inv .meta{display:flex;justify-content:space-between;align-items:center;gap:8px}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.copy{display:flex;gap:8px}.copy input{font-size:14px}
footer{margin-top:40px;font-size:13px;color:var(--muted);text-align:center}
.pay-hero{text-align:center;padding:26px 18px}
.pay-hero .big{font-size:48px;margin:8px 0}
details{border-bottom:1px solid var(--line);padding:12px 0}summary{font-weight:600;cursor:pointer}
/* demo */
.demo-frame{border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--bg);margin:10px 0}
.demo-bar{display:flex;gap:6px;align-items:center;padding:9px 12px;background:#f3f4f6;border-bottom:1px solid var(--line)}
.demo-bar span{width:10px;height:10px;border-radius:50%;background:#d1d5db}.demo-bar code{margin-left:8px;font-size:12px;color:var(--muted)}
.demo-body{padding:4px 14px}
.demo-body .btn[aria-disabled]{cursor:default}
.demo-when{display:flex;gap:8px;align-items:center;margin-bottom:8px}
.demo-hdr{display:grid;grid-template-columns:auto 1fr;gap:2px 12px;margin:0 0 10px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.demo-hdr dt{color:var(--muted)}.demo-hdr dd{margin:0;overflow-wrap:anywhere}
.demo-mail p{margin:0 0 12px}.demo-mail a:not([style]){text-decoration:underline;color:#2563eb}
/* guides */
.article h2{margin-top:32px}.article li{margin:4px 0}
.tpl{background:#fff;border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:12px;padding:14px 16px;margin:12px 0;white-space:pre-wrap;font-size:15px;font-family:inherit;overflow-wrap:anywhere}
.tpl b{display:block;margin-bottom:6px}
.crumbs{font-size:14px;color:var(--muted)}