:root {
  color-scheme: dark;
  --bg: #050608;
  --panel: #0b0f14;
  --panel2: #111820;
  --line: rgba(255,255,255,.1);
  --text: #f5f7fb;
  --muted: #a7b0bd;
  --blue: #0a84ff;
  --cyan: #64d2ff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at 70% 0%, rgba(10,132,255,.16), transparent 34%), var(--bg);
  color: var(--text);
}
a { color: inherit; }
.seo-shell { min-height: 100vh; }
.seo-top {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px clamp(20px, 5vw, 72px);
  background: rgba(5,6,8,.86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.seo-brand { display: flex; gap: 12px; align-items: center; font-weight: 800; }
.seo-brand img { width: 36px; height: 36px; border-radius: 10px; }
.seo-nav { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.seo-nav a, .seo-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  background: rgba(255,255,255,.04);
  color: var(--text);
  font-weight: 700;
}
.seo-btn.primary { background: var(--blue); border-color: var(--blue); color: white; }
.seo-main { width: min(1120px, calc(100% - 32px)); margin: 0 auto; padding: 56px 0 80px; }
.seo-hero {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 24px;
  align-items: stretch;
}
.seo-card, .seo-section {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(180deg, rgba(17,24,32,.96), rgba(11,15,20,.96));
  padding: clamp(20px, 4vw, 36px);
}
.seo-kicker {
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: 12px;
  font-weight: 900;
}
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(36px, 6vw, 70px); line-height: 1.03; margin-bottom: 18px; }
h2 { font-size: clamp(26px, 4vw, 40px); margin-bottom: 16px; }
h3 { font-size: 18px; margin-bottom: 8px; }
p, li { color: var(--muted); line-height: 1.75; }
.seo-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }
.seo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 24px; }
.seo-grid.two { grid-template-columns: repeat(2, 1fr); }
.seo-mini { padding: 18px; border: 1px solid var(--line); border-radius: 16px; background: rgba(255,255,255,.035); }
.seo-qr { display: grid; place-items: center; min-height: 100%; text-align: center; }
.seo-qr img { width: min(260px, 80%); border-radius: 20px; background: white; padding: 12px; }
.seo-list { display: grid; gap: 14px; padding-left: 18px; }
.seo-section { margin-top: 24px; }
.seo-note { border-color: rgba(255,214,10,.35); background: rgba(255,214,10,.08); }
.seo-footer { color: var(--muted); border-top: 1px solid var(--line); padding: 24px clamp(20px, 5vw, 72px); }
@media (max-width: 820px) {
  .seo-top { align-items: flex-start; flex-direction: column; }
  .seo-nav { justify-content: flex-start; }
  .seo-hero, .seo-grid, .seo-grid.two { grid-template-columns: 1fr; }
}