:root {
  --bg: #f3f5f8;
  --surface: #ffffff;
  --text: #1c2430;
  --muted: #5d6b7d;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --border: #e2e8f0;
  --warning-bg: #fff7ed;
  --warning-border: #fdba74;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
}

.seo-topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
}

.seo-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}

.seo-brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

.seo-brand small {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.seo-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

.breadcrumbs {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 16px;
}

.breadcrumbs a {
  color: var(--accent);
  text-decoration: none;
}

.breadcrumbs span {
  margin: 0 6px;
}

h1 {
  font-size: 28px;
  line-height: 1.25;
  margin: 0 0 16px;
}

h2 {
  font-size: 20px;
  margin: 32px 0 12px;
}

.seo-intro {
  font-size: 17px;
  color: var(--muted);
}

.seo-cta {
  margin: 28px 0;
  text-align: center;
}

.cta-button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-size: 18px;
  font-weight: 600;
  padding: 14px 36px;
  border-radius: 12px;
  text-decoration: none;
}

.cta-button:hover {
  background: var(--accent-dark);
}

.cause-list li,
.seo-page ol li {
  margin-bottom: 8px;
}

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

.warning-box {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: 12px;
  padding: 16px 18px;
  margin: 28px 0;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 10px;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
}

.faq-item p {
  margin: 10px 0 4px;
  color: var(--muted);
}

.symptom-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}

.symptom-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  text-decoration: none;
  color: var(--text);
}

.symptom-card:hover {
  border-color: var(--accent);
}

.symptom-card small {
  display: block;
  color: var(--muted);
  margin-top: 4px;
}

.related-list li {
  margin-bottom: 8px;
}

.related-list a {
  color: var(--accent);
  text-decoration: none;
}

.seo-footer {
  border-top: 1px solid var(--border);
  padding: 20px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

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

@media (max-width: 600px) {
  h1 {
    font-size: 23px;
  }

  .cta-button {
    width: 100%;
    text-align: center;
  }
}