:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --ink: #1c2333;
  --muted: #5b6478;
  --accent: #4f46e5;
  --radius: 14px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
}
header.top {
  background: var(--card);
  border-bottom: 1px solid rgba(28,35,51,.08);
  padding: 14px 24px;
}
header.top a { color: var(--ink); text-decoration: none; font-weight: 700; }
header.top a span { color: var(--accent); }
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 24px 60px;
}
h1 { font-size: 1.9rem; letter-spacing: -0.02em; line-height: 1.25; margin-bottom: 8px; }
.byline { color: var(--muted); font-size: .9rem; margin-bottom: 28px; }
h2 { font-size: 1.25rem; margin: 32px 0 10px; }
p, li { color: #333a4d; margin-bottom: 14px; }
ol, ul { padding-left: 24px; margin-bottom: 14px; }
li { margin-bottom: 8px; }
a { color: var(--accent); }
.cta {
  background: var(--card);
  border: 1px solid rgba(79,70,229,.25);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 28px 0;
  box-shadow: 0 1px 3px rgba(28,35,51,.06);
}
.cta strong { display: block; margin-bottom: 6px; }
.cta a.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 8px;
  margin-top: 8px;
}
.tip {
  background: #eef2ff;
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  padding: 12px 16px;
  margin: 18px 0;
  font-size: .95rem;
}
footer {
  text-align: center;
  padding: 24px;
  color: var(--muted);
  font-size: .85rem;
  border-top: 1px solid rgba(28,35,51,.08);
}
footer a { color: var(--muted); }
.more {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid rgba(28,35,51,.1);
}
.more h2 { margin-top: 0; }

/* Guides index */
.guide-list { display: grid; gap: 16px; margin-top: 24px; }
.guide-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px 22px;
  box-shadow: 0 1px 3px rgba(28,35,51,.08);
  text-decoration: none;
  display: block;
}
.guide-card h3 { color: var(--ink); font-size: 1.05rem; margin-bottom: 4px; }
.guide-card p { color: var(--muted); font-size: .92rem; margin: 0; }