:root {
  --ink: #12181f;
  --ink-soft: #4b5563;
  --paper: #ffffff;
  --paper-sunk: #f4f6f8;
  --line: #e2e6ea;
  --brand: #1a3a5c;
  --accent: #f2a900;
  --good: #1a7f3c;
  --warn: #b5750a;
  --bad: #b3261e;
  --radius: 10px;
  --max-width: 780px;
}

* { box-sizing: border-box; }

html { color-scheme: light; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
}

a { color: var(--brand); }

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--brand);
}

.site-header .wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  color: #fff;
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand .bolt { color: var(--accent); }

.site-header nav a {
  color: #dbe6f0;
  text-decoration: none;
  font-size: 0.92rem;
  margin-left: 18px;
}

.site-header nav a:hover { color: #fff; }

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 28px 20px 60px;
}

h1 { font-size: 1.6rem; margin: 0 0 6px; }
h2 { font-size: 1.15rem; margin: 28px 0 10px; }
p.lede { color: var(--ink-soft); margin-top: 0; }

.card {
  background: var(--paper-sunk);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 18px;
}

.field-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 560px) {
  .field-grid { grid-template-columns: 1fr 1fr; }
}

.field { display: flex; flex-direction: column; gap: 6px; }

.field label { font-size: 0.85rem; font-weight: 600; color: var(--ink); }
.field .hint { font-size: 0.78rem; color: var(--ink-soft); }

input[type="number"], select {
  font-size: 1rem;
  padding: 10px 12px;
  border: 1px solid #c7ced6;
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}

input[type="number"]:focus, select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.radio-row { display: flex; gap: 16px; align-items: center; }
.radio-row label { font-weight: 500; font-size: 0.92rem; display: flex; gap: 6px; align-items: center; }

button.calc {
  margin-top: 18px;
  background: var(--accent);
  color: #201400;
  border: none;
  font-weight: 700;
  font-size: 1rem;
  padding: 12px 22px;
  border-radius: 8px;
  cursor: pointer;
}

button.calc:hover { filter: brightness(0.95); }

.result {
  margin-top: 20px;
  padding: 18px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #fff;
  display: none;
}

.result.show { display: block; }

.result .headline {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--brand);
}

.result .sub { color: var(--ink-soft); font-size: 0.92rem; margin-top: 4px; }

.badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  margin-top: 10px;
}

.badge.good { background: #e4f5e8; color: var(--good); }
.badge.warn { background: #fbeed7; color: var(--warn); }
.badge.bad  { background: #fbe3e1; color: var(--bad); }

table.spec {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
  font-size: 0.88rem;
}

table.spec th, table.spec td {
  text-align: left;
  padding: 7px 8px;
  border-bottom: 1px solid var(--line);
}

table.spec th { color: var(--ink-soft); font-weight: 600; }

.hub-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 16px;
}

@media (min-width: 560px) {
  .hub-grid { grid-template-columns: 1fr 1fr; }
}

.tool-card {
  display: block;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  background: var(--paper-sunk);
}

.tool-card:hover { border-color: var(--brand); }
.tool-card .name { font-weight: 700; color: var(--brand); font-size: 1.05rem; }
.tool-card .desc { color: var(--ink-soft); font-size: 0.9rem; margin-top: 6px; }

.disclaimer {
  font-size: 0.82rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  margin-top: 32px;
  padding-top: 16px;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 20px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 10px;
}
.breadcrumb a { text-decoration: none; }

.ad-slot {
  margin: 28px 0;
  text-align: center;
}

.ad-slot .ad-label {
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

.ad-slot ins.adsbygoogle {
  display: block;
  min-height: 250px;
}

.leadgen-card {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: #fff8e8;
  border: 1px solid #f0d590;
  border-radius: var(--radius);
  padding: 18px;
  margin: 24px 0;
}

.leadgen-icon { font-size: 1.6rem; line-height: 1; }

.leadgen-title { font-weight: 700; color: var(--brand); font-size: 1.02rem; }

.leadgen-desc { color: var(--ink-soft); font-size: 0.9rem; margin: 6px 0 12px; }

.leadgen-cta {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.92rem;
  padding: 9px 16px;
  border-radius: 7px;
}

.leadgen-cta:hover { filter: brightness(1.15); }

.leadgen-disclosure { font-size: 0.72rem; color: var(--ink-soft); margin: 10px 0 0; }

/* Article/guide pages */
.article-meta {
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin: -4px 0 20px;
}

.prose p, .prose li { color: var(--ink); }
.prose h2 { margin-top: 30px; }
.prose ul, .prose ol { padding-left: 1.2em; }
.prose li { margin-bottom: 6px; }

.related-tools {
  background: var(--paper-sunk);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 24px 0;
  font-size: 0.92rem;
}
.related-tools strong { display: block; margin-bottom: 6px; }
.related-tools a { margin-right: 14px; }

.guide-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 16px;
}
.guide-list a {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--ink);
  background: var(--paper-sunk);
  font-weight: 600;
}
.guide-list a:hover { border-color: var(--brand); color: var(--brand); }
.guide-list .g-desc { display: block; font-weight: 400; color: var(--ink-soft); font-size: 0.85rem; margin-top: 4px; }

.site-footer nav {
  margin-bottom: 10px;
}
.site-footer nav a {
  color: var(--ink-soft);
  text-decoration: none;
  margin: 0 8px;
  font-size: 0.8rem;
}
.site-footer nav a:hover { color: var(--brand); }

.section-jump {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 4px 0 20px;
}
.section-jump a {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper-sunk);
  color: var(--ink);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
}
.section-jump a:hover { border-color: var(--brand); color: var(--brand); }

.trade-heading {
  margin: 30px 0 6px;
  font-size: 1.05rem;
  color: var(--brand);
  display: flex;
  align-items: center;
  gap: 8px;
}