:root {
  --brand: #2d4de0;
  --brand-dark: #0f28c4;
  --ink: #1a1a2e;
  --muted: #5b5b6b;
  --bg: #ffffff;
  --bg-soft: #f5f6fb;
  --border: #e6e8f0;
  --radius: 16px;
  --maxw: 720px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 18px;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(8px);
  z-index: 10;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 20px;
  color: var(--ink);
}
.brand-mark {
  height: 30px;
  width: auto;
  display: block;
}

.cta-button {
  display: inline-block;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: #fff !important;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 10px;
}
.cta-button:hover { text-decoration: none; opacity: 0.92; }

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 24px 64px;
}

.breadcrumb {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 24px;
}

article h1 {
  font-size: 2.1rem;
  line-height: 1.2;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.meta {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 32px;
}

article h2 {
  font-size: 1.5rem;
  margin: 44px 0 14px;
  letter-spacing: -0.01em;
}
article h3 { font-size: 1.2rem; margin: 32px 0 10px; }

article p { margin: 0 0 18px; }
article ul, article ol { margin: 0 0 18px; padding-left: 24px; }
article li { margin-bottom: 8px; }

blockquote {
  margin: 24px 0;
  padding: 14px 20px;
  border-left: 4px solid var(--brand);
  background: var(--bg-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--ink);
}

.callout {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin: 36px 0;
}
.callout h3 { margin-top: 0; }

.lead { font-size: 1.15rem; color: var(--ink); }

.post-list { list-style: none; padding: 0; }
.post-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  transition: border-color 0.15s ease;
}
.post-card:hover { border-color: var(--brand); }
.post-card h2 { margin: 0 0 8px; font-size: 1.35rem; }
.post-card p { margin: 0 0 8px; color: var(--muted); }
.post-card a.read { font-weight: 600; }

.faq-block { margin-top: 40px; }
.faq-item {
  border-top: 1px solid var(--border);
  padding: 20px 0;
}
.faq-item h3 { margin: 0 0 6px; font-size: 1.1rem; }
.faq-item p { margin: 0; color: var(--muted); }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}
.site-footer a { color: var(--muted); margin: 0 10px; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 16px;
}
th, td {
  border: 1px solid var(--border);
  padding: 10px 14px;
  text-align: left;
}
th { background: var(--bg-soft); }

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f0f1f7;
    --muted: #a0a3b5;
    --bg: #0d0e14;
    --bg-soft: #161824;
    --border: #262a3a;
  }
  .site-header { background: rgba(13, 14, 20, 0.9); }
  .brand { color: var(--ink); }
}