:root {
  color-scheme: light;
  --ink: #172027;
  --muted: #5a6871;
  --line: #d9e0e4;
  --paper: #ffffff;
  --soft: #f4f7f8;
  --green: #0f766e;
  --green-dark: #0b554f;
  --blue: #1d4ed8;
  --yellow: #f3c74f;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

a { color: inherit; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  transform: translateY(-160%);
  padding: 9px 13px;
  border-radius: 6px;
  color: #fff;
  background: var(--ink);
}

.skip-link:focus { transform: translateY(0); }

.seo-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
  padding: 0 5vw;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
}

.seo-brand {
  color: var(--ink);
  font-size: 20px;
  font-weight: 800;
  text-decoration: none;
}

.seo-nav { display: flex; align-items: center; gap: 20px; }
.seo-nav a { color: var(--muted); font-size: 14px; text-decoration: none; }
.seo-nav .nav-cta { color: #fff; background: var(--green); padding: 8px 13px; border-radius: 6px; }

.seo-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, .95fr);
  align-items: center;
  gap: clamp(28px, 5vw, 72px);
  min-height: min(740px, calc(100vh - 60px));
  max-width: 1180px;
  margin: 0 auto;
  padding: 72px 28px 58px;
}

.seo-kicker {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.seo-hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: 64px;
  line-height: 1.06;
  letter-spacing: 0;
}

.seo-hero h1 strong { color: var(--green); }

.programmatic-page .seo-hero h1 {
  font-size: clamp(48px, 4.7vw, 60px);
}

.seo-lead {
  max-width: 720px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 20px;
}

.seo-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.seo-button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 17px; border: 1px solid var(--line); border-radius: 6px; font-weight: 700; text-decoration: none; }
.seo-button.primary { color: #fff; border-color: var(--green); background: var(--green); }

.hero-proof { margin-top: 24px; color: var(--muted); font-size: 13px; }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumb a { color: var(--green-dark); }

.status-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 26px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.status-strip div { padding: 13px 15px; background: var(--paper); }
.status-strip strong { display: block; font-size: 14px; }
.status-strip small { display: block; margin-top: 2px; color: var(--muted); }

.price-board {
  border: 1px solid var(--line);
  border-top: 5px solid var(--yellow);
  border-radius: 8px;
  background: var(--soft);
  padding: clamp(22px, 4vw, 38px);
}

.price-board small { color: var(--muted); }
.price-board .price { margin: 6px 0; color: var(--green-dark); font-size: 68px; font-weight: 850; line-height: 1; }
.price-board .price span { font-size: 16px; font-weight: 700; }
.price-board ul { margin: 24px 0 0; padding: 18px 0 0 20px; border-top: 1px solid var(--line); }

.seo-band { border-top: 1px solid var(--line); }
.seo-band.soft { background: var(--soft); }
.seo-inner { max-width: 1080px; margin: 0 auto; padding: 68px 28px; }
.seo-inner > h2 { max-width: 800px; margin: 0 0 14px; font-size: 42px; line-height: 1.15; }
.section-intro { max-width: 760px; margin: 0 0 34px; color: var(--muted); }

.price-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 8px; background: var(--paper); }
table { width: 100%; border-collapse: collapse; min-width: 700px; }
th, td { padding: 15px 17px; border-bottom: 1px solid var(--line); text-align: left; }
th { background: #edf3f3; font-size: 13px; }
tr:last-child td { border-bottom: 0; }
.best-price { color: var(--green-dark); font-weight: 800; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-item { border-top: 3px solid var(--green); padding: 20px 0 0; }
.feature-item:nth-child(2) { border-color: var(--blue); }
.feature-item:nth-child(3) { border-color: var(--yellow); }
.feature-item h3 { margin: 0 0 8px; font-size: 20px; }
.feature-item p { margin: 0; color: var(--muted); }

.topic-grid,
.command-grid,
.error-grid,
.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.topic-card,
.command-card,
.error-card,
.result-card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  padding: 22px;
}

.topic-card { display: block; text-decoration: none; }
.topic-card:hover { border-color: var(--green); }
.topic-card small { color: var(--green); font-weight: 800; }
.topic-card h3, .command-card h3, .error-card h3 { margin: 6px 0 7px; font-size: 19px; }
.topic-card p, .command-card p, .error-card p { margin: 0; color: var(--muted); }
.topic-card code { overflow-wrap: anywhere; }

.command-card pre { margin-bottom: 0; }
.command-card .copy-line { margin-top: 15px; }

.inline-code {
  display: inline-block;
  max-width: 100%;
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--soft);
  overflow-wrap: anywhere;
}

.route-proof {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin: 18px 0;
  padding: 15px 17px;
  border-left: 4px solid var(--green);
  background: #eaf4f2;
}

.route-proof strong { flex: 0 0 auto; color: var(--green-dark); }
.route-proof p { margin: 0; }

.source-note {
  margin: 22px 0 0;
  padding: 15px 17px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  background: var(--soft);
  font-size: 13px;
}

.source-note a { color: var(--green-dark); }

.screen-layout { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(260px, .8fr); gap: 34px; align-items: center; }
.screen-layout figure { margin: 0; }
.screen-layout img { display: block; width: 100%; height: auto; border: 1px solid var(--line); border-radius: 8px; }
.screen-layout figcaption { margin-top: 8px; color: var(--muted); font-size: 13px; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--line); }
.step { background: var(--paper); padding: 24px; }
.step span { color: var(--green); font-weight: 850; }
.step h3 { margin: 6px 0; }
.step p { margin: 0; color: var(--muted); }

pre { overflow-x: auto; margin: 24px 0; padding: 20px; border: 1px solid #26343d; border-radius: 8px; color: #f8fafc; background: #172027; font-size: 14px; line-height: 1.65; }
code { font-family: "SFMono-Regular", Consolas, monospace; }

.checklist { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px 36px; margin: 30px 0; }
.checklist div { padding: 0 0 18px; border-bottom: 1px solid var(--line); }
.checklist strong { display: block; margin-bottom: 5px; }
.checklist p { margin: 0; color: var(--muted); }

.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 20px 0; }
.faq summary { cursor: pointer; font-weight: 750; }
.faq p { max-width: 760px; margin: 12px 0 0; color: var(--muted); }

.calculator-shell {
  display: grid;
  grid-template-columns: minmax(0, .88fr) minmax(340px, 1.12fr);
  gap: 28px;
  align-items: start;
}

.calculator-form,
.calculator-results {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  padding: clamp(20px, 3vw, 30px);
}

.field-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.field-grid .wide { grid-column: 1 / -1; }
.calculator-form label { display: grid; gap: 6px; color: var(--muted); font-size: 13px; font-weight: 700; }
.calculator-form input,
.calculator-form select {
  width: 100%;
  min-height: 44px;
  border: 1px solid #b8c4ca;
  border-radius: 6px;
  color: var(--ink);
  background: #fff;
  padding: 9px 11px;
  font: inherit;
}

.calculator-form input:focus,
.calculator-form select:focus { outline: 3px solid rgba(15, 118, 110, .18); border-color: var(--green); }
.calculator-help { margin: 18px 0 0; color: var(--muted); font-size: 13px; }
.calculator-results h3 { margin: 0 0 18px; }
.result-grid { gap: 10px; }
.result-card { padding: 16px; background: var(--soft); }
.result-card small { display: block; color: var(--muted); }
.result-card strong { display: block; margin-top: 4px; color: var(--green-dark); font-size: 25px; }
.result-card.total { border-color: var(--green); background: #eaf4f2; }
.formula { margin: 18px 0 0; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
.calculator-results .seo-button { margin-top: 18px; }

.topic-nav {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--soft);
}

.topic-nav .seo-inner { padding-top: 28px; padding-bottom: 28px; }
.topic-nav strong { display: block; margin-bottom: 10px; }
.topic-links { display: flex; flex-wrap: wrap; gap: 9px; }
.topic-links a { padding: 7px 10px; border: 1px solid var(--line); border-radius: 5px; color: var(--green-dark); background: #fff; text-decoration: none; font-size: 13px; }

.seo-cta { color: #fff; background: #172027; }
.seo-cta .seo-inner { display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.seo-cta h2 { margin: 0; }
.seo-cta p { margin: 8px 0 0; color: #c9d3d8; }

.seo-footer { display: flex; justify-content: space-between; gap: 20px; padding: 28px 5vw; color: var(--muted); font-size: 13px; }
.seo-footer nav { display: flex; gap: 16px; }

@media (max-width: 820px) {
  .seo-nav a:not(.nav-cta) { display: none; }
  .seo-hero { grid-template-columns: 1fr; min-height: auto; padding-top: 52px; }
  .seo-hero h1 { font-size: 46px; }
  .seo-lead { font-size: 18px; }
  .price-board .price { font-size: 54px; }
  .seo-inner > h2 { font-size: 36px; }
  .feature-grid, .steps, .screen-layout, .calculator-shell { grid-template-columns: 1fr; }
  .status-strip { grid-template-columns: 1fr; }
  .checklist { grid-template-columns: 1fr; gap: 8px; }
  .seo-cta .seo-inner, .seo-footer { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 520px) {
  .seo-header { padding: 0 16px; }
  .seo-hero, .seo-inner { padding-left: 18px; padding-right: 18px; }
  .seo-hero h1 { font-size: 40px; }
  .seo-inner > h2 { font-size: 32px; }
  .seo-actions { align-items: stretch; flex-direction: column; }
  .seo-button { width: 100%; }
  .price-board { padding: 22px 18px; }
  .price-board .price { font-size: 46px; }
  .topic-grid, .command-grid, .error-grid, .result-grid, .field-grid { grid-template-columns: 1fr; }
  .field-grid .wide { grid-column: auto; }
  .topic-card, .command-card, .error-card, .calculator-form, .calculator-results { padding: 18px; }
  .status-strip { gap: 0; }
  .status-strip div + div { border-top: 1px solid var(--line); }

  .price-table-wrap {
    overflow: visible;
    border: 0;
    border-radius: 0;
    background: transparent;
  }

  table,
  tbody { display: block; min-width: 0; }

  thead { display: none; }

  tbody { display: grid; gap: 12px; }

  tr {
    display: block;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--paper);
  }

  td {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 14px;
    padding: 12px 14px;
    text-align: right;
  }

  td::before {
    color: var(--muted);
    content: attr(data-label);
    font-size: 13px;
    text-align: left;
  }

  td:first-child {
    display: block;
    border-bottom: 1px solid var(--line);
    background: #edf3f3;
    text-align: left;
  }

  td:first-child::before { content: none; }
  td:last-child { border-bottom: 0; }
}