:root {
  color-scheme: light;
  --ink: #10202a;
  --muted: #5e6c72;
  --line: #dce6e3;
  --panel: #ffffff;
  --soft: #f4f7f6;
  --accent: #0b6b70;
  --accent-dark: #074b4f;
}

* {
  box-sizing: border-box;
}

html {
  font-family: Arial, "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--soft);
}

body {
  margin: 0;
  line-height: 1.68;
}

a {
  color: var(--accent);
}

.seo-header,
.seo-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  padding: 18px clamp(18px, 5vw, 72px);
  background: #09171e;
  color: #fff;
}

.seo-header a,
.seo-footer a {
  color: #fff;
  text-decoration: none;
}

.seo-brand {
  display: grid;
  gap: 2px;
}

.seo-brand strong {
  font-size: 18px;
}

.seo-brand span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
}

.seo-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 14px;
}

.seo-main {
  width: min(1080px, calc(100% - 36px));
  margin: 0 auto;
  padding: clamp(30px, 6vw, 72px) 0;
}

.seo-hero {
  display: grid;
  gap: 18px;
  margin-bottom: 28px;
}

.seo-kicker {
  margin: 0;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  max-width: 18ch;
  margin: 0;
  font-size: clamp(34px, 6vw, 60px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.18;
  letter-spacing: 0;
}

p {
  margin: 0;
}

.seo-lead {
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
}

.seo-panel {
  display: grid;
  gap: 22px;
  padding: clamp(18px, 4vw, 34px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.seo-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.seo-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.seo-list li,
.seo-pill {
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--soft);
  color: var(--muted);
  font-size: 14px;
}

.seo-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.seo-gallery img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 8px;
  object-fit: cover;
  background: var(--soft);
}

.seo-card-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.seo-card-list a {
  display: grid;
  gap: 6px;
  min-height: 100%;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  text-decoration: none;
}

.seo-card-list strong {
  color: var(--ink);
}

.seo-card-list span {
  color: var(--muted);
  font-size: 14px;
}

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

.seo-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.seo-button.secondary {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--accent-dark);
}

@media (max-width: 760px) {
  .seo-grid,
  .seo-gallery,
  .seo-card-list {
    grid-template-columns: 1fr;
  }

  h1 {
    max-width: 100%;
  }
}