:root {
  --seo-ink: #251936;
  --seo-muted: #6f667b;
  --seo-purple: #6d3bbd;
  --seo-purple-dark: #4d247f;
  --seo-lilac: #f1eafb;
  --seo-cream: #fffaf0;
  --seo-gold: #b7791f;
  --seo-line: rgba(77, 36, 127, .14);
  --seo-white: #fff;
  --seo-shadow: 0 20px 60px rgba(49, 29, 75, .12);
}

* { box-sizing: border-box; }

body.seo-landing {
  margin: 0;
  color: var(--seo-ink);
  background:
    radial-gradient(circle at 14% 6%, rgba(183, 121, 31, .12), transparent 27rem),
    radial-gradient(circle at 92% 13%, rgba(109, 59, 189, .13), transparent 25rem),
    #fbf9f5;
  font-family: "Songti SC", "STSong", "Noto Serif SC", "PingFang SC", serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.seo-shell { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }
.seo-reading { width: min(760px, 100%); margin-inline: auto; }

.seo-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(77, 36, 127, .1);
  background: rgba(255, 252, 247, .88);
  backdrop-filter: blur(16px);
}

.seo-topbar-inner {
  min-height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.seo-brand {
  color: var(--seo-purple-dark);
  font-weight: 900;
  letter-spacing: .04em;
  text-decoration: none;
}

.seo-nav { display: flex; align-items: center; gap: 16px; font-size: 14px; }
.seo-nav a { color: var(--seo-muted); text-decoration: none; }
.seo-nav a:hover { color: var(--seo-purple); }

.seo-hero {
  min-height: 610px;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, .92fr);
  align-items: center;
  gap: clamp(34px, 7vw, 92px);
  padding: 72px 0 62px;
}

.seo-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--seo-gold);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .12em;
}

.seo-eyebrow::before { content: ""; width: 28px; height: 1px; background: currentColor; }
.seo-hero h1 { margin: 18px 0 18px; font-size: clamp(38px, 5.3vw, 68px); line-height: 1.08; letter-spacing: -.035em; }
.seo-hero h1 em { color: var(--seo-purple); font-style: normal; }
.seo-lead { max-width: 660px; margin: 0 0 28px; color: #554b62; font-size: clamp(18px, 2vw, 22px); }

.seo-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.seo-cta-primary,
.seo-cta-secondary {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 13px 24px;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 800;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.seo-cta-primary { color: #fff; background: var(--seo-purple-dark); box-shadow: 0 14px 32px rgba(77, 36, 127, .26); }
.seo-cta-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 36px rgba(77, 36, 127, .32); }
.seo-cta-secondary { color: var(--seo-purple-dark); border: 1px solid var(--seo-line); background: rgba(255, 255, 255, .7); }
.seo-cta-secondary:hover { background: #fff; }

.seo-trust { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 22px 0 0; padding: 0; color: var(--seo-muted); font: 13px/1.5 "PingFang SC", sans-serif; list-style: none; }
.seo-trust li::before { content: "✓"; margin-right: 6px; color: var(--seo-gold); font-weight: 900; }

.seo-face-card {
  position: relative;
  min-height: 440px;
  overflow: hidden;
  border: 1px solid rgba(109, 59, 189, .16);
  border-radius: 44% 44% 28px 28px;
  background: linear-gradient(150deg, #efe7fa 0%, #fffaf0 55%, #eadfcf 100%);
  box-shadow: var(--seo-shadow);
}

.seo-face-outline {
  position: absolute;
  inset: 72px 70px 58px;
  border: 2px solid rgba(77, 36, 127, .28);
  border-radius: 48% 48% 44% 44%;
}

.seo-face-outline::before,
.seo-face-outline::after { content: ""; position: absolute; left: 12%; right: 12%; height: 1px; background: rgba(183, 121, 31, .45); }
.seo-face-outline::before { top: 34%; }
.seo-face-outline::after { top: 66%; }
.seo-face-axis { position: absolute; top: 7%; bottom: 7%; left: 50%; width: 1px; background: rgba(109, 59, 189, .25); }
.seo-face-eye { position: absolute; top: 38%; width: 54px; height: 20px; border-top: 2px solid rgba(77, 36, 127, .5); border-radius: 50%; }
.seo-face-eye.left { left: 15%; }
.seo-face-eye.right { right: 15%; }
.seo-face-note { position: absolute; max-width: 154px; padding: 9px 12px; border: 1px solid rgba(255, 255, 255, .7); border-radius: 12px; color: var(--seo-purple-dark); background: rgba(255, 255, 255, .76); box-shadow: 0 8px 22px rgba(49, 29, 75, .08); font: 12px/1.4 "PingFang SC", sans-serif; }
.seo-face-note.one { top: 58px; right: 18px; }
.seo-face-note.two { bottom: 42px; left: 18px; }

.seo-section { padding: 78px 0; }
.seo-section.alt { border-block: 1px solid rgba(77, 36, 127, .08); background: rgba(255, 255, 255, .58); }
.seo-kicker { margin: 0 0 10px; color: var(--seo-gold); font: 800 12px/1.4 "PingFang SC", sans-serif; letter-spacing: .14em; text-transform: uppercase; }
.seo-section h2 { margin: 0 0 18px; font-size: clamp(28px, 4vw, 42px); line-height: 1.25; }
.seo-section-intro { max-width: 720px; margin: 0 0 34px; color: var(--seo-muted); font-size: 17px; }

.seo-process-grid,
.seo-hub-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.seo-step,
.seo-hub-card { border: 1px solid var(--seo-line); border-radius: 22px; background: rgba(255, 255, 255, .82); box-shadow: 0 12px 35px rgba(49, 29, 75, .06); }
.seo-step { padding: 24px; }
.seo-step-num { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--seo-purple-dark); font: 800 14px/1 "PingFang SC", sans-serif; }
.seo-step h3 { margin: 18px 0 8px; font-size: 20px; }
.seo-step p { margin: 0; color: var(--seo-muted); }

.seo-sample {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(260px, .85fr);
  gap: 32px;
  align-items: center;
  padding: clamp(22px, 4vw, 42px);
  border: 1px solid rgba(183, 121, 31, .24);
  border-radius: 28px;
  background: var(--seo-cream);
  box-shadow: var(--seo-shadow);
}
.seo-sample img { width: 100%; height: auto; display: block; border-radius: 18px; border: 1px solid rgba(77, 36, 127, .12); box-shadow: 0 14px 34px rgba(49, 29, 75, .12); }
.seo-sample h3 { margin: 8px 0 12px; font-size: 28px; }
.seo-sample p { color: var(--seo-muted); }
.seo-disclosure { padding: 10px 12px; border-left: 3px solid var(--seo-gold); color: #755726; background: rgba(183, 121, 31, .08); font: 13px/1.65 "PingFang SC", sans-serif; }

.seo-reading h3 { margin: 32px 0 8px; font-size: 21px; }
.seo-reading p { color: #51475e; }

.seo-faq { display: grid; gap: 12px; }
.seo-faq details { border: 1px solid var(--seo-line); border-radius: 16px; background: #fff; padding: 0 18px; }
.seo-faq summary { min-height: 54px; display: flex; align-items: center; justify-content: space-between; gap: 14px; cursor: pointer; font-weight: 800; list-style: none; }
.seo-faq summary::-webkit-details-marker { display: none; }
.seo-faq summary::after { content: "+"; color: var(--seo-purple); font-size: 23px; font-weight: 400; }
.seo-faq details[open] summary::after { content: "−"; }
.seo-faq details p { margin: 0 0 18px; color: var(--seo-muted); }

.seo-hub-card { display: block; padding: 22px; color: inherit; text-decoration: none; transition: transform .18s ease, border-color .18s ease; }
.seo-hub-card:hover { transform: translateY(-3px); border-color: rgba(109, 59, 189, .36); }
.seo-hub-card span { color: var(--seo-gold); font: 800 11px/1.4 "PingFang SC", sans-serif; letter-spacing: .1em; }
.seo-hub-card h3 { margin: 8px 0 6px; font-size: 20px; }
.seo-hub-card p { margin: 0; color: var(--seo-muted); font-size: 14px; }

.seo-final { padding: 54px 26px; border-radius: 28px; color: #fff; background: var(--seo-purple-dark); text-align: center; }
.seo-final h2 { margin-bottom: 10px; }
.seo-final p { margin: 0 auto 22px; max-width: 620px; color: rgba(255,255,255,.78); }
.seo-final .seo-cta-primary { color: var(--seo-purple-dark); background: #fff; box-shadow: none; }

.seo-footer { padding: 36px 0 44px; color: var(--seo-muted); font: 12px/1.7 "PingFang SC", sans-serif; text-align: center; }

/* Modules injected into existing editorial pages. */
.article-conversion,
.article-sample,
.article-core-hubs,
.article-faq,
.article-sources { margin: 30px 0; font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; }
.article-conversion { padding: 20px; border: 1px solid rgba(109, 59, 189, .2); border-radius: 16px; background: linear-gradient(120deg, #f7f1ff, #fffaf0); }
.article-conversion strong { display: block; margin-bottom: 4px; color: var(--seo-purple-dark); font-size: 18px; }
.article-conversion p { margin: 0 0 14px; color: #62576f; font-size: 14px; }
.article-conversion a,
.article-sample a { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; padding: 10px 19px; border-radius: 999px; color: #fff; background: var(--seo-purple-dark); font-weight: 800; text-decoration: none; }
.article-sample { overflow: hidden; border: 1px solid var(--seo-line); border-radius: 18px; background: var(--seo-cream); }
.article-sample img { width: 100%; height: auto; display: block; aspect-ratio: 1200 / 760; object-fit: cover; border-bottom: 1px solid var(--seo-line); }
.article-sample-copy { padding: 18px; }
.article-sample-copy h2 { margin-top: 0; }
.article-sample-copy p { font-size: 14px; color: #6b6076; }
.article-core-hubs { padding: 18px; border-top: 1px solid #eee; border-bottom: 1px solid #eee; }
.article-core-hubs strong { display: block; margin-bottom: 7px; }
.article-core-hubs a { display: block; padding: 5px 0; color: var(--seo-purple); text-decoration: none; }
.article-faq h2 { margin-bottom: 14px; }
.article-faq details { margin: 10px 0; padding: 0 14px; border: 1px solid var(--seo-line); border-radius: 12px; background: #fff; }
.article-faq summary { padding: 12px 0; cursor: pointer; color: var(--seo-ink); font-weight: 800; }
.article-faq details p { margin: 0 0 14px; color: #675d72; font-size: 14px; }
.article-table-wrap { max-width: 100%; margin: 18px 0; overflow-x: auto; border: 1px solid var(--seo-line); border-radius: 14px; background: #fff; -webkit-overflow-scrolling: touch; }
.article-table { width: 100%; min-width: 620px; border-collapse: collapse; font-size: 14px; line-height: 1.65; }
.article-table th,
.article-table td { padding: 11px 13px; border-bottom: 1px solid #eee9f5; text-align: left; vertical-align: top; }
.article-table th { color: var(--seo-purple-dark); background: #f7f3fc; font-weight: 800; white-space: nowrap; }
.article-table tr:last-child td { border-bottom: 0; }
.article-sources { padding: 18px; border: 1px solid #e5dfed; border-radius: 14px; background: #fff; }
.article-sources h2 { margin-top: 0; }
.article-sources ol { margin: 0; padding-left: 22px; }
.article-sources li { margin: 8px 0; color: #62576f; font-size: 14px; }
.article-sources a { color: var(--seo-purple); overflow-wrap: anywhere; }
.article-group-title { margin: 34px 0 14px; color: #5b21b6; font-size: 20px; line-height: 1.4; }

a:focus-visible,
summary:focus-visible { outline: 3px solid rgba(183, 121, 31, .45); outline-offset: 3px; }

@media (max-width: 760px) {
  .seo-shell { width: min(100% - 28px, 680px); }
  .seo-nav a:not(.seo-nav-primary) { display: none; }
  .seo-hero { min-height: auto; grid-template-columns: 1fr; gap: 38px; padding: 48px 0 42px; }
  .seo-hero h1 { font-size: clamp(36px, 11vw, 52px); }
  .seo-face-card { min-height: 360px; }
  .seo-face-outline { inset: 58px 50px 48px; }
  .seo-section { padding: 58px 0; }
  .seo-process-grid,
  .seo-hub-grid { grid-template-columns: 1fr; }
  .seo-sample { grid-template-columns: 1fr; padding: 18px; }
  .seo-final { padding: 38px 18px; }
  .seo-actions .seo-cta-primary { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}