:root {
  --ink: #1a1a1a;
  --muted: #666;
  --faint: #999;
  --accent: #1a56db;
  --accent-dark: #1543a8;
  --green: #2d6a4f;
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --border: #e5e7eb;
  --max: 720px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink); background: var(--bg); line-height: 1.65; font-size: 17px;
}
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* Header */
header { border-bottom: 1px solid var(--border); }
.nav { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; }
.logo { font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; }
.logo span { color: var(--accent); }
.nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 15px; }
.nav a:hover { color: var(--ink); }
.nav .cta { color: #fff; background: var(--accent); padding: 8px 16px; border-radius: 8px; font-weight: 600; }
.nav .cta:hover { background: var(--accent-dark); color: #fff; }

/* Hero */
.hero { padding: 72px 0 56px; text-align: center; }
.hero h1 { font-size: 40px; line-height: 1.2; letter-spacing: -0.02em; margin-bottom: 20px; }
.hero .sub { font-size: 20px; color: var(--muted); max-width: 560px; margin: 0 auto 32px; }
.hero .tagline { font-size: 15px; color: var(--faint); margin-top: 16px; }
.btn { display: inline-block; background: var(--accent); color: #fff; font-weight: 600;
  padding: 14px 32px; border-radius: 10px; text-decoration: none; font-size: 17px; }
.btn:hover { background: var(--accent-dark); }
.btn-ghost { display: inline-block; color: var(--accent); font-weight: 600; padding: 14px 20px;
  text-decoration: none; font-size: 17px; }

/* Sections */
section { padding: 48px 0; }
section.alt { background: var(--bg-soft); }
h2 { font-size: 26px; margin-bottom: 20px; letter-spacing: -0.01em; }
h3 { font-size: 19px; margin: 28px 0 10px; }
p + p { margin-top: 14px; }
.features { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 28px; }
.feature h3 { margin: 0 0 6px; font-size: 17px; }
.feature p { color: var(--muted); font-size: 15px; }
@media (max-width: 600px) { .features { grid-template-columns: 1fr; } .hero h1 { font-size: 30px; } }

/* Pricing */
.price-card { border: 1px solid var(--border); border-radius: 14px; padding: 32px; text-align: center;
  max-width: 420px; margin: 24px auto 0; }
.price { font-size: 40px; font-weight: 700; }
.price small { font-size: 16px; color: var(--muted); font-weight: 400; }
.price-card ul { list-style: none; margin: 20px 0; color: var(--muted); }
.price-card li { padding: 5px 0; }

/* Blog list */
.post-list { list-style: none; }
.post-list li { padding: 22px 0; border-bottom: 1px solid var(--border); }
.post-list a { font-size: 20px; font-weight: 600; color: var(--ink); text-decoration: none; }
.post-list a:hover { color: var(--accent); }
.post-list .desc { color: var(--muted); font-size: 15px; margin-top: 6px; }

/* Article */
article { padding: 48px 0; }
article h1 { font-size: 32px; line-height: 1.25; margin-bottom: 28px; letter-spacing: -0.02em; }
article h2 { font-size: 24px; margin: 36px 0 14px; }
article ul, article ol { margin: 14px 0 14px 24px; }
article li { margin: 6px 0; }
article p { margin: 14px 0; }
article a { color: var(--accent); }
article strong { font-weight: 650; }
article table { border-collapse: collapse; margin: 20px 0; width: 100%; font-size: 15px; }
article th, article td { border: 1px solid var(--border); padding: 10px 12px; text-align: left; }
article th { background: var(--bg-soft); }
article blockquote { border-left: 3px solid var(--accent); padding-left: 16px; color: var(--muted); margin: 16px 0; }
.post-cta { background: var(--bg-soft); border: 1px solid var(--border); border-radius: 12px;
  padding: 24px; margin: 36px 0; text-align: center; }
.post-cta p { margin: 0 0 14px; }

/* Footer */
footer { border-top: 1px solid var(--border); padding: 32px 0; color: var(--faint); font-size: 14px; }
footer a { color: var(--muted); text-decoration: none; margin-right: 16px; }