:root {
  color-scheme: dark;
  --bg: #0d0c0b;
  --surface: #181614;
  --surface-strong: #211e1a;
  --line: rgba(255, 255, 255, 0.1);
  --text: #f6f0e7;
  --muted: #b4aa9d;
  --accent: #ef7655;
  --accent-strong: #ff9a79;
  --green: #7bc39b;
  --max: 1120px;
  font-family:
    "Noto Sans SC",
    "PingFang SC",
    "Microsoft YaHei",
    system-ui,
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 15% 5%, rgba(239, 118, 85, 0.12), transparent 32%),
    radial-gradient(circle at 90% 20%, rgba(123, 195, 155, 0.08), transparent 28%),
    var(--bg);
  color: var(--text);
} 

a {
  color: inherit;
}

.seo-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: rgba(13, 12, 11, 0.88);
  backdrop-filter: blur(18px);
}

.seo-header-inner {
  display: flex;
  width: min(calc(100% - 32px), var(--max));
  min-height: 64px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 0 auto;
}

.seo-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.seo-brand img {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.seo-brand strong {
  display: block;
  font-size: 15px;
  letter-spacing: 0.08em;
}

.seo-brand span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 9px;
  letter-spacing: 0.12em;
}

.seo-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 6px 18px;
}

.seo-nav a {
  color: var(--muted);
  font-size: 12px;
  text-decoration: none;
}

.seo-nav a[aria-current="page"],
.seo-nav a:hover {
  color: var(--accent-strong);
}

.seo-main {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
}

.seo-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 48px;
  align-items: center;
  min-height: 520px;
  padding: 72px 0 54px;
}

.seo-kicker {
  margin: 0 0 14px;
  color: var(--accent-strong);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.seo-hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(42px, 6vw, 72px);
  letter-spacing: -0.055em;
  line-height: 1.03;
}

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

.seo-lead {
  max-width: 700px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.9;
}

.seo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.seo-button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: 1px solid var(--accent);
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
  text-decoration: none;
}

.seo-button.secondary {
  border-color: var(--line);
  background: transparent;
  color: var(--text);
}

.seo-panel {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.065), rgba(255, 255, 255, 0.015)),
    var(--surface);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.28);
}

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

.seo-proof-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.seo-proof-list li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.025);
}

.seo-proof-list b {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 8px;
  background: rgba(239, 118, 85, 0.14);
  color: var(--accent-strong);
  font-family: ui-monospace, monospace;
  font-size: 11px;
}

.seo-proof-list span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.seo-section {
  padding: 52px 0;
  border-top: 1px solid var(--line);
}

.seo-section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.seo-section h2 {
  margin: 0;
  font-size: clamp(25px, 4vw, 40px);
  letter-spacing: -0.035em;
}

.seo-section-heading p {
  max-width: 520px;
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.75;
}

.seo-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.seo-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
}

.seo-card strong {
  display: block;
  margin-bottom: 9px;
  font-size: 16px;
}

.seo-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.75;
}

.seo-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.seo-steps li {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.seo-steps b {
  display: block;
  margin-bottom: 16px;
  color: var(--accent);
  font-family: ui-monospace, monospace;
  font-size: 12px;
}

.seo-steps strong {
  display: block;
  margin-bottom: 7px;
  font-size: 14px;
}

.seo-steps span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.seo-faq {
  display: grid;
  gap: 10px;
}

.seo-faq details {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}

.seo-faq summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
}

.seo-faq p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.8;
}

.seo-related {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.seo-related a {
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--muted);
  font-size: 12px;
  text-decoration: none;
}

.seo-related a:hover {
  border-color: var(--accent);
  color: var(--text);
}

.seo-footer {
  margin-top: 30px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.seo-footer-inner {
  display: flex;
  width: min(calc(100% - 32px), var(--max));
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 0 auto;
  padding: 26px 0 34px;
  font-size: 11px;
}

.seo-footer a {
  color: var(--muted);
  text-decoration: none;
}

.seo-footer a:hover {
  color: var(--text);
}

@media (max-width: 860px) {
  .seo-header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .seo-nav {
    justify-content: flex-start;
  }

  .seo-hero {
    grid-template-columns: 1fr;
    min-height: auto;
    gap: 26px;
    padding: 48px 0 38px;
  }

  .seo-hero h1 {
    font-size: clamp(36px, 11vw, 54px);
  }

  .seo-section-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .seo-card-grid,
  .seo-related {
    grid-template-columns: 1fr 1fr;
  }

  .seo-steps {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 520px) {
  .seo-main,
  .seo-header-inner,
  .seo-footer-inner {
    width: min(calc(100% - 24px), var(--max));
  }

  .seo-nav {
    gap: 8px 14px;
  }

  .seo-card-grid,
  .seo-related,
  .seo-steps {
    grid-template-columns: 1fr;
  }
}