:root {
  color-scheme: light;
  --seo-ink: #172822;
  --seo-muted: #61736c;
  --seo-green: #16845d;
  --seo-green-dark: #0d5f43;
  --seo-lime: #d8f17c;
  --seo-paper: #f5f7f4;
  --seo-line: #dce5e0;
  --seo-white: #ffffff;
}

body { margin: 0; }

.seo-fallback *,
.seo-static * { box-sizing: border-box; }

.seo-fallback,
.seo-static {
  color: var(--seo-ink);
  background: var(--seo-paper);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  font-synthesis: none;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

.seo-static { min-height: 100vh; }

.seo-fallback a,
.seo-static a { color: var(--seo-green-dark); }

.seo-fallback a:hover,
.seo-static a:hover { color: var(--seo-green); }

.seo-shell {
  width: min(1160px, calc(100% - 40px));
  margin-inline: auto;
}

.seo-skip {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 20;
  padding: 10px 14px;
  color: var(--seo-white);
  background: var(--seo-green-dark);
  border-radius: 8px;
}

.seo-skip:focus { top: 12px; }

.seo-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(220, 229, 224, .9);
  background: rgba(255, 255, 255, .95);
  backdrop-filter: blur(14px);
}

.seo-nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 26px;
}

.seo-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--seo-ink);
  font-size: 20px;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.seo-brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  color: var(--seo-ink);
  background: var(--seo-lime);
  border-radius: 12px;
}

.seo-links {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
}

.seo-links a {
  color: #42534c;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
}

.seo-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.seo-button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 8px 18px;
  border: 1px solid var(--seo-green-dark);
  border-radius: 12px;
  color: var(--seo-green-dark);
  background: transparent;
  font-weight: 700;
  text-decoration: none;
}

.seo-button.primary {
  color: var(--seo-white);
  background: var(--seo-green-dark);
}

.seo-hero {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 56px;
  align-items: center;
  padding-block: 90px 78px;
}

.seo-eyebrow {
  margin: 0 0 14px;
  color: var(--seo-green);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .08em;
}

.seo-hero h1,
.seo-page-hero h1 {
  max-width: 920px;
  margin: 0;
  font-size: clamp(38px, 6vw, 68px);
  line-height: 1.12;
  letter-spacing: -.045em;
}

.seo-lead {
  max-width: 760px;
  margin: 24px 0 0;
  color: var(--seo-muted);
  font-size: clamp(17px, 2vw, 21px);
}

.seo-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.seo-proof {
  padding: 30px;
  border: 1px solid var(--seo-line);
  border-radius: 24px;
  background: var(--seo-white);
  box-shadow: 0 20px 55px rgba(23, 40, 34, .08);
}

.seo-proof h2 { margin: 0 0 16px; font-size: 22px; }

.seo-proof ol { margin: 0; padding-left: 22px; }

.seo-proof li + li { margin-top: 12px; }

.seo-section { padding-block: 72px; }

.seo-section.alt {
  width: 100%;
  border-block: 1px solid var(--seo-line);
  background: var(--seo-white);
}

.seo-section-heading { max-width: 760px; margin-bottom: 32px; }

.seo-section-heading h2 {
  margin: 0;
  font-size: clamp(29px, 4vw, 44px);
  line-height: 1.2;
  letter-spacing: -.025em;
}

.seo-section-heading p { margin: 14px 0 0; color: var(--seo-muted); font-size: 17px; }

.seo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.seo-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.seo-card {
  padding: 28px;
  border: 1px solid var(--seo-line);
  border-radius: 20px;
  background: var(--seo-white);
}

.alt .seo-card { background: var(--seo-paper); }

.seo-card h2,
.seo-card h3 { margin: 0 0 10px; line-height: 1.35; }

.seo-card p { margin: 0; color: var(--seo-muted); }

.seo-card p + p,
.seo-card ul,
.seo-card ol { margin-top: 14px; }

.seo-card a.more { display: inline-block; margin-top: 18px; font-weight: 700; }

.seo-tag {
  display: inline-flex;
  margin-bottom: 14px;
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--seo-green-dark);
  background: #e6f4ee;
  font-size: 13px;
  font-weight: 800;
}

.seo-page-hero { padding-block: 68px 48px; }

.seo-page-hero h1 { font-size: clamp(36px, 5vw, 58px); }

.seo-breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  color: var(--seo-muted);
  font-size: 14px;
}

.seo-breadcrumbs a { color: var(--seo-muted); }

.seo-content {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 44px;
  padding-bottom: 80px;
}

.seo-article {
  padding: clamp(24px, 5vw, 52px);
  border: 1px solid var(--seo-line);
  border-radius: 24px;
  background: var(--seo-white);
}

.seo-article h2 {
  margin: 2.2em 0 .55em;
  font-size: clamp(25px, 3vw, 34px);
  line-height: 1.3;
}

.seo-article h2:first-child { margin-top: 0; }

.seo-article h3 { margin: 1.7em 0 .45em; font-size: 21px; }

.seo-article p,
.seo-article li { color: #44564f; }

.seo-article ul,
.seo-article ol { padding-left: 1.3em; }

.seo-article li + li { margin-top: 8px; }

.seo-note {
  margin-block: 24px;
  padding: 18px 20px;
  border-left: 4px solid var(--seo-green);
  border-radius: 0 12px 12px 0;
  background: #edf7f2;
}

.seo-toc {
  position: sticky;
  top: 96px;
  align-self: start;
  padding: 22px;
  border: 1px solid var(--seo-line);
  border-radius: 18px;
  background: var(--seo-white);
}

.seo-toc strong { display: block; margin-bottom: 10px; }

.seo-toc a { display: block; padding-block: 6px; color: var(--seo-muted); text-decoration: none; }

.seo-faq details {
  padding: 20px 0;
  border-top: 1px solid var(--seo-line);
}

.seo-faq details:last-child { border-bottom: 1px solid var(--seo-line); }

.seo-faq summary { cursor: pointer; font-size: 18px; font-weight: 750; }

.seo-faq details p { margin: 12px 0 0; color: var(--seo-muted); }

.seo-cta {
  display: flex;
  gap: 28px;
  align-items: center;
  justify-content: space-between;
  margin-block: 72px;
  padding: 34px;
  border-radius: 24px;
  color: var(--seo-white);
  background: var(--seo-ink);
}

.seo-cta h2 { margin: 0 0 6px; }

.seo-cta p { margin: 0; color: #bfd0c9; }

.seo-cta .seo-button { border-color: var(--seo-lime); color: var(--seo-ink); background: var(--seo-lime); }

.seo-footer { padding-block: 42px; color: #aebdb7; background: var(--seo-ink); }

.seo-footer .seo-shell { display: grid; gap: 20px; }

.seo-footer .seo-brand { color: var(--seo-white); }

.seo-footer-links { display: flex; flex-wrap: wrap; gap: 18px; }

.seo-footer a { color: #d7e2dd; }

.seo-footer p { margin: 0; }

.seo-price { font-size: 32px; font-weight: 850; color: var(--seo-ink); }

.seo-price small { font-size: 14px; font-weight: 500; color: var(--seo-muted); }

.seo-table { width: 100%; border-collapse: collapse; }

.seo-table th,
.seo-table td { padding: 14px 12px; border-bottom: 1px solid var(--seo-line); text-align: left; }

.seo-table th { color: var(--seo-ink); }

@media (max-width: 900px) {
  .seo-links { display: none; }
  .seo-nav { gap: 12px; }
  .seo-actions { margin-left: auto; }
  .seo-hero,
  .seo-content { grid-template-columns: 1fr; }
  .seo-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .seo-toc { position: static; order: -1; }
}

@media (max-width: 620px) {
  .seo-shell { width: min(100% - 28px, 1160px); }
  .seo-nav { min-height: 64px; }
  .seo-brand { font-size: 17px; }
  .seo-brand-mark { width: 34px; height: 34px; }
  .seo-actions .seo-button:first-child { display: none; }
  .seo-button { padding-inline: 13px; }
  .seo-hero { gap: 34px; padding-block: 58px; }
  .seo-grid,
  .seo-grid.two { grid-template-columns: 1fr; }
  .seo-section { padding-block: 52px; }
  .seo-page-hero { padding-block: 46px 34px; }
  .seo-cta { align-items: flex-start; flex-direction: column; margin-block: 52px; }
  .seo-table { display: block; overflow-x: auto; white-space: nowrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}