/* Visual language follows 8ae.com's seller landing page (light theme only, like 8ae). */
:root{
  --bg:#fbfdfa;--ink:#101218;--head:#07090c;--muted:#5b6474;--line:#e0e5ed;
  --link:#223e74;--eyebrow:#50649a;--lime:#c9fb79;--mint:#e4facd;--chip-bg:#e6f6d7;--chip-ink:#244d32;
  --btn:#0c0e11;--card:rgba(255,255,255,.72);--shadow:0 9px 30px rgba(72,102,64,.06);
  --display:'Space Grotesk',sans-serif;--body:'DM Sans',sans-serif;--max:740px;
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;color:var(--ink);font:17px/1.7 var(--body);
  background:
    radial-gradient(at 72% 8%, rgba(193,251,158,.28), transparent 31%),
    radial-gradient(at 4% 30%, rgba(198,243,158,.2), transparent 31%),
    var(--bg);
  background-repeat:no-repeat;background-attachment:scroll}
.wrap{max-width:var(--max);margin:0 auto;padding:0 16px}
a{color:var(--link);text-underline-offset:3px}

.site-header{background:rgba(255,255,255,.8);backdrop-filter:blur(18px);position:sticky;top:0;z-index:10;border-bottom:1px solid rgba(224,229,237,.7)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--head);text-decoration:none;font:700 21px/1 var(--display);letter-spacing:-.06em}
.mark{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;background:var(--lime);color:#09111b;font:700 16px/1 var(--display);letter-spacing:-.06em;box-shadow:0 0 35px rgba(201,251,121,.25)}
nav a{color:var(--muted);text-decoration:none;margin-left:20px;font-size:15px;font-weight:500}
nav a:hover{color:var(--head)}

main{padding:40px 16px 64px}
h1,h2,h3{font-family:var(--display);color:var(--head)}
h1{font-size:clamp(32px,5.4vw,48px);line-height:1.02;letter-spacing:-.05em;margin:.35em 0 .45em}
h2{font-size:clamp(24px,3.4vw,30px);line-height:1.15;letter-spacing:-.035em;margin:2.1em 0 .5em;scroll-margin-top:80px}
h3{font-size:20px;line-height:1.3;letter-spacing:-.02em;margin:1.7em 0 .4em}
p,li{margin:.6em 0}
strong{font-weight:700;color:var(--head)}

.eyebrow{display:inline-block;font:700 11px/1 var(--body);letter-spacing:.24em;text-transform:uppercase;color:var(--eyebrow);margin:0}
.chip{display:inline-block;padding:7px 13px;border-radius:999px;background:var(--chip-bg);color:var(--chip-ink);font:700 12px/1.2 var(--body);letter-spacing:.04em;text-decoration:none}
.meta{color:var(--muted);font-size:14px}

.hero{padding:8px 0 4px}
.hero h1{font-size:clamp(38px,7vw,64px);line-height:.99;letter-spacing:-.07em;max-width:680px}
.hero p{color:#3e4a5c;font-size:19px;max-width:620px}

.cards{list-style:none;padding:0;margin:36px 0;display:grid;gap:18px}
.card a{display:block;padding:24px 22px;border-radius:20px;background:var(--card);box-shadow:var(--shadow);border:1px solid rgba(224,229,237,.8);color:var(--ink);text-decoration:none;transition:transform .15s ease,box-shadow .15s ease}
.card a:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(72,102,64,.1)}
.card h2{font-size:24px;margin:.5em 0 .3em}
.card p{margin:.35em 0}

.toc{border-radius:20px;background:var(--card);box-shadow:var(--shadow);border:1px solid rgba(224,229,237,.8);padding:16px 22px;margin:28px 0}
.toc p{font:700 11px/1 var(--body);letter-spacing:.24em;text-transform:uppercase;color:var(--eyebrow);margin:.4em 0 .8em}
.toc ol{margin:0;padding-left:20px;font-size:15px}
.toc a{text-decoration:none}
.toc a:hover{text-decoration:underline}

.table-wrap{overflow-x:auto;margin:1.2em 0;border-radius:14px;border:1px solid var(--line);background:#fff}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{text-align:left;padding:11px 13px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:#f3f9ee;font-weight:700;color:var(--head)}
tr:last-child td{border-bottom:0}

.cta{margin:32px 0;padding:24px;border-radius:20px;background:
  radial-gradient(at 90% 10%, rgba(193,251,158,.45), transparent 55%),#fff;
  border:1px solid rgba(224,229,237,.9);box-shadow:var(--shadow)}
.cta p{margin:0}
.cta a{display:inline-flex;align-items:center;gap:10px;margin-top:16px;padding:14px 18px;border-radius:10px;background:var(--btn);color:#fff;font:700 15px/1 var(--body);text-decoration:none;box-shadow:0 5px 13px rgba(0,0,0,.09)}
.cta a::after{content:"→";font-size:17px}
.cta a:hover{background:#252a31}

code{font-size:.9em}
.site-footer{border-top:1px solid var(--line);color:#596b82;font-size:14px;padding:28px 0 44px;background:var(--bg)}
.site-footer strong{color:var(--head)}
.brand{white-space:nowrap}
@media (max-width:600px){
  .brand{font-size:18px;gap:8px}
  .mark{width:30px;height:30px;font-size:14px}
  nav a{margin-left:14px;font-size:14px}
  .eyebrow,.toc p{font-size:10px;letter-spacing:.18em}
  body{font-size:16.5px}
}
@media (max-width:380px){
  .brand{font-size:16px}
  .mark{width:28px;height:28px;font-size:13px}
  nav a{margin-left:10px;font-size:13px}
}
.cta-inline{display:flex;align-items:center;gap:14px 18px;flex-wrap:wrap;margin:26px 0;padding:16px 18px;border-radius:16px;background:linear-gradient(90deg,#f1fde4,#fff);border:1px solid #d7ecc4}
.cta-inline p{margin:0;flex:1 1 280px;font-size:15.5px;line-height:1.55;color:var(--head)}
.cta-inline a{flex:none;display:inline-flex;align-items:center;gap:8px;padding:11px 15px;border-radius:10px;background:var(--btn);color:#fff;font:700 14px/1 var(--body);text-decoration:none;box-shadow:0 5px 13px rgba(0,0,0,.09)}
.cta-inline a::after{content:"→"}
.cta-inline a:hover{background:#252a31}
/* Calculator */
.calc{margin:24px 0;padding:20px;border-radius:20px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow)}
.calc-tabs{display:flex;gap:6px;padding:4px;border-radius:12px;background:#f1f5ef;margin-bottom:18px}
.calc-tabs button{flex:1;border:0;border-radius:9px;padding:10px 8px;background:transparent;font:700 14px/1.2 var(--body);color:var(--muted);cursor:pointer}
.calc-tabs button[aria-selected="true"]{background:#fff;color:var(--head);box-shadow:0 2px 8px rgba(0,0,0,.08)}
.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px 16px}
.calc-grid .mp{display:contents}
.calc-grid .mp[hidden]{display:none}
.calc label{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:700;color:var(--head)}
.calc label.check{flex-direction:row;align-items:center;font-weight:500;grid-column:1/-1}
.calc .opt{font-weight:400;color:var(--muted)}
.calc small{font-weight:400;color:var(--muted);font-size:12.5px;line-height:1.45}
.calc input[type=text],.calc select{font:500 16px/1.2 var(--body);padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:#fbfdfa;color:var(--head);width:100%}
.calc input:focus,.calc select:focus{outline:2px solid var(--lime);border-color:#9fd46a}
.calc-result{margin-top:20px;padding:16px;border-radius:14px;background:linear-gradient(90deg,#f1fde4,#fff);border:1px solid #d7ecc4}
.calc-result .big{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}
.calc-result .big span{font-weight:700;color:var(--muted)}
.calc-result .big strong{font:700 clamp(28px,6vw,38px)/1 var(--display);letter-spacing:-.04em;color:var(--head)}
.calc-result table{width:100%;margin-top:10px;font-size:14.5px;background:transparent}
.calc-result td{padding:6px 0;border-bottom:1px solid #e2eed6}
.calc-result td:last-child{text-align:right;white-space:nowrap}
.calc-result tr.sum td{font-weight:700;border-bottom:0}
.profit{margin:10px 0 0;font-weight:700}.profit.ok{color:#1d6b3a}.profit.bad{color:#b3261e}
.calc-target{margin-top:16px;display:grid;grid-template-columns:minmax(0,220px) 1fr;gap:12px;align-items:end}
.calc-target p{margin:0 0 10px}
.tool-card{display:flex;flex-direction:column;gap:6px;margin:28px 0 0;padding:20px 22px;border-radius:20px;text-decoration:none;color:var(--ink);background:radial-gradient(at 90% 10%,rgba(193,251,158,.5),transparent 55%),#fff;border:1px solid #d7ecc4;box-shadow:var(--shadow)}
.tool-card .chip{align-self:flex-start}
.tool-card strong{font:700 22px/1.2 var(--display);letter-spacing:-.03em;color:var(--head)}
@media (max-width:600px){.calc-grid,.calc-target{grid-template-columns:1fr}.calc{padding:16px}}
@media (max-width:480px){
  .site-header .wrap{gap:10px}
  .brand{font-size:16px;gap:7px}
  .mark{width:28px;height:28px;font-size:13px}
  nav a{margin-left:10px;font-size:13px}
}
@media (max-width:360px){nav a[href="/"]{display:none}}
pre{position:relative;margin:1.2em 0;padding:16px 16px 16px;border-radius:14px;background:#0f1419;color:#e8f0e6;font:13.5px/1.6 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap;word-break:break-word;overflow-x:auto}
pre code{font:inherit;background:none;color:inherit}
pre .copy{position:absolute;top:10px;right:10px;border:0;border-radius:8px;padding:6px 10px;background:var(--lime);color:#09111b;font:700 12px/1 var(--body);cursor:pointer}
pre code{display:block;padding-right:64px}
.note{margin:20px 0;padding:16px 18px;border-radius:14px;background:#f3f9ee;border-left:4px solid #9fd46a}
.note p{margin:0}