:root {
  --ink: #122029;
  --muted: #5d6e77;
  --paper: #f6f8f6;
  --white: #ffffff;
  --line: #dce3df;
  --green: #087f5b;
  --blue: #2563eb;
  --coral: #e6574f;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.seo-header { position: sticky; top: 0; z-index: 10; height: 68px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 28px; padding: 0 max(24px, calc((100vw - 1160px) / 2)); background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); }
.seo-brand { display: inline-flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 850; }
.seo-brand img { width: 36px; height: 36px; object-fit: cover; border-radius: 6px; }
.seo-nav { display: flex; gap: 22px; color: var(--muted); font-size: 14px; }
.seo-nav a:hover { color: var(--green); }
.download { display: inline-flex; justify-content: center; align-items: center; min-height: 44px; padding: 0 18px; color: var(--white); background: var(--ink); border-radius: 6px; font-weight: 800; }
.download:hover { background: var(--green); }
.seo-hero, .seo-band-inner, .seo-footer-inner { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }
.seo-hero { min-height: 620px; display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(280px, .72fr); align-items: center; gap: 72px; padding: 72px 0; }
.eyebrow { margin: 0 0 18px; color: var(--green); font-size: 13px; font-weight: 900; letter-spacing: 0; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 760px; margin-bottom: 24px; font-size: clamp(44px, 6vw, 78px); line-height: 1.04; letter-spacing: 0; }
.lead { max-width: 720px; margin-bottom: 28px; color: var(--muted); font-size: 20px; line-height: 1.8; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.secondary { display: inline-flex; align-items: center; min-height: 44px; padding: 0 18px; border: 1px solid var(--line); border-radius: 6px; font-weight: 800; background: var(--white); }
.hero-shot { justify-self: end; width: min(100%, 390px); max-height: 560px; object-fit: cover; object-position: top; border: 1px solid var(--line); border-radius: 6px; box-shadow: 0 20px 60px rgba(18,32,41,.12); }
.hero-shot.landscape { width: 100%; max-height: none; aspect-ratio: 16 / 9; object-fit: cover; }
.seo-band { padding: 88px 0; background: var(--white); border-top: 1px solid var(--line); }
.seo-band.alt { background: #eef4f2; }
.seo-band.blue { background: #edf3fb; }
.seo-band.coral { background: #fff1ed; }
.section-heading { max-width: 760px; margin-bottom: 46px; }
h2 { margin-bottom: 16px; font-size: clamp(34px, 4vw, 52px); line-height: 1.12; letter-spacing: 0; }
.section-heading p, .split-copy p { color: var(--muted); font-size: 18px; line-height: 1.8; }
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.step { min-width: 0; padding: 28px 24px; border-right: 1px solid var(--line); }
.step:last-child { border-right: 0; }
.step span { color: var(--coral); font-size: 13px; font-weight: 900; }
.step h3 { margin: 14px 0 8px; font-size: 20px; }
.step p { margin-bottom: 0; color: var(--muted); line-height: 1.7; }
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, 440px); align-items: center; gap: 80px; }
.split.reverse { grid-template-columns: minmax(280px, 440px) minmax(0, 1fr); }
.split img { width: 100%; max-height: 540px; object-fit: cover; object-position: top; border: 1px solid var(--line); border-radius: 6px; }
.feature-list { margin: 28px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.feature-list li { padding: 17px 0; border-bottom: 1px solid var(--line); color: var(--muted); line-height: 1.65; }
.feature-list strong { color: var(--ink); }
.seo-cta { padding: 76px 0; background: var(--ink); color: var(--white); }
.seo-cta .seo-band-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.seo-cta h2 { margin-bottom: 8px; }
.seo-cta p { margin-bottom: 0; color: #c9d4d9; }
.seo-cta .download { color: var(--ink); background: var(--white); flex: 0 0 auto; }
.seo-footer { padding: 34px 0; background: var(--white); border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.seo-footer-inner { display: flex; justify-content: space-between; gap: 24px; }
.seo-footer nav { display: flex; flex-wrap: wrap; gap: 18px; }
@media (max-width: 820px) {
  .seo-header { grid-template-columns: auto 1fr; height: 62px; padding: 0 16px; }
  .seo-nav { display: none; }
  .seo-header .download { justify-self: end; min-height: 38px; padding: 0 12px; font-size: 13px; }
  .seo-hero, .seo-band-inner, .seo-footer-inner { width: min(100% - 32px, 620px); }
  .seo-hero { min-height: 0; grid-template-columns: minmax(0, 1fr) minmax(132px, 34%); gap: 20px; padding: 52px 0 60px; }
  h1 { font-size: clamp(35px, 10vw, 54px); }
  .lead { font-size: 17px; }
  .hero-shot { max-height: 390px; }
  .seo-band { padding: 64px 0; }
  .steps { grid-template-columns: 1fr 1fr; }
  .step:nth-child(2) { border-right: 0; }
  .step:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .split, .split.reverse { grid-template-columns: 1fr minmax(140px, 34%); gap: 24px; }
  .split.reverse img { order: 2; }
  .split img { max-height: 420px; }
  .seo-cta .seo-band-inner { align-items: flex-start; flex-direction: column; }
  .seo-footer-inner { flex-direction: column; }
}
@media (max-width: 520px) {
  .seo-hero { grid-template-columns: minmax(0, 1fr) 116px; }
  h1 { font-size: 34px; }
  .lead { font-size: 16px; line-height: 1.7; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions a { justify-content: center; }
  .steps { grid-template-columns: 1fr; }
  .step, .step:nth-child(2) { border-right: 0; border-bottom: 1px solid var(--line); }
  .step:last-child { border-bottom: 0; }
  .split, .split.reverse { grid-template-columns: minmax(0, 1fr) 116px; gap: 18px; }
  .section-heading p, .split-copy p { font-size: 16px; }
}