/* SellerMath design system — warm paper, terracotta, sage */
:root {
  --paper: #faf7f0;
  --surface: #ffffff;
  --ink: #2b2a26;
  --ink-soft: #6b675e;
  --line: #e5ddca;
  --line-strong: #3c403c;
  --accent: #ca8b6d;
  --accent-deep: #a96e52;
  --sage: #a4c0b5;
  --sage-deep: #5f7f70;
  --blue: #88a3bc;
  --cream: #f4ecc9;
  --radius: 6px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}
.num, output, .result-value, td[data-n] { font-variant-numeric: tabular-nums; }
a { color: var(--accent-deep); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }
h1, h2, h3 { line-height: 1.25; font-weight: 600; letter-spacing: -0.01em; }
h1 { font-size: 1.9rem; margin: 0 0 0.5rem; }
h2 { font-size: 1.3rem; margin: 2.2rem 0 0.6rem; }
h3 { font-size: 1.05rem; margin: 1.6rem 0 0.4rem; }
p { margin: 0.7rem 0; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.site-header { border-bottom: 1px solid var(--line); background: var(--paper); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; padding-top: 16px; padding-bottom: 16px; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 1.15rem; color: var(--ink); text-decoration: none; letter-spacing: -0.02em; }
.brand svg { display: block; }
.brand span em { font-style: normal; color: var(--accent-deep); }
.site-nav { display: flex; gap: 22px; font-size: 0.92rem; }
.site-nav a { color: var(--ink-soft); text-decoration: none; }
.site-nav a:hover { color: var(--accent-deep); }

.page-head { padding: 40px 0 8px; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.72rem; font-weight: 600; color: var(--accent-deep); margin-bottom: 10px; }
.lede { color: var(--ink-soft); max-width: 640px; font-size: 1.02rem; }
.updated { font-size: 0.8rem; color: var(--ink-soft); }

.tool-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; margin: 26px 0 10px; align-items: start; }
@media (max-width: 820px) { .tool-grid { grid-template-columns: 1fr; } }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 22px; }
.panel h2 { margin-top: 0; font-size: 1rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-soft); }

.field { margin-bottom: 14px; }
.field label { display: block; font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-soft); margin-bottom: 5px; }
.field input, .field select {
  width: 100%; padding: 9px 11px; font-size: 1rem; color: var(--ink);
  background: var(--surface); border: 1.5px solid var(--line-strong); border-radius: var(--radius);
  font-variant-numeric: tabular-nums;
}
.field input:focus, .field select:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.field .hint { font-size: 0.78rem; color: var(--ink-soft); margin-top: 4px; text-transform: none; letter-spacing: 0; font-weight: 400; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.check { display: flex; gap: 8px; align-items: center; font-size: 0.9rem; margin: 10px 0; }
.check input { width: 16px; height: 16px; accent-color: var(--accent-deep); }

.btn {
  display: inline-block; width: 100%; padding: 11px 18px; border: 1.5px solid var(--line-strong);
  border-radius: var(--radius); background: var(--accent); color: var(--ink); font-weight: 600;
  font-size: 0.95rem; cursor: pointer; text-align: center;
}
.btn:hover { background: var(--accent-deep); color: #fff; }
.btn-secondary { background: var(--surface); }
.btn-secondary:hover { background: var(--cream); color: var(--ink); }

.result-hero { border-bottom: 1px solid var(--line); padding-bottom: 14px; margin-bottom: 14px; }
.result-hero .label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--ink-soft); }
.result-value { font-size: 2.4rem; font-weight: 700; letter-spacing: -0.02em; line-height: 1.15; }
.result-value.good { color: var(--sage-deep); }
.result-value.bad { color: var(--accent-deep); }
.result-sub { font-size: 0.85rem; color: var(--ink-soft); }
table.breakdown { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
table.breakdown td, table.breakdown th { padding: 8px 0; border-bottom: 1px solid var(--line); text-align: left; }
table.breakdown td:last-child, table.breakdown th:last-child { text-align: right; font-variant-numeric: tabular-nums; }
table.breakdown tr.total td { border-bottom: none; font-weight: 700; padding-top: 12px; }
.note-box { background: var(--cream); border-radius: var(--radius); padding: 12px 16px; font-size: 0.88rem; margin-top: 16px; }

.prose { max-width: 720px; padding-bottom: 30px; }
.prose li { margin: 5px 0; }
.prose table { width: 100%; border-collapse: collapse; font-size: 0.92rem; margin: 14px 0; }
.prose th, .prose td { border-bottom: 1px solid var(--line); padding: 8px 10px; text-align: left; }
.prose th { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-soft); }
.faq details { border-bottom: 1px solid var(--line); padding: 10px 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { color: var(--ink-soft); }

.card-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; margin: 26px 0; }
.tool-card { display: block; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 20px; text-decoration: none; color: var(--ink); }
.tool-card:hover { border-color: var(--accent); }
.tool-card .tag { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent-deep); font-weight: 600; }
.tool-card h3 { margin: 6px 0 6px; font-size: 1.05rem; }
.tool-card p { font-size: 0.88rem; color: var(--ink-soft); margin: 0; }

.site-footer { border-top: 1px solid var(--line); margin-top: 40px; padding: 26px 0 34px; font-size: 0.85rem; color: var(--ink-soft); }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 26px; justify-content: space-between; }
.site-footer a { color: var(--ink-soft); }
.related { font-size: 0.92rem; }
.related a { display: inline-block; margin-right: 16px; }