: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;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
header.top {
  background: var(--card);
  border-bottom: 1px solid rgba(28,35,51,.08);
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
header.top a.brand { color: var(--ink); text-decoration: none; font-weight: 700; }
header.top a.brand span { color: var(--accent); }
header.top nav { display: flex; gap: 16px; flex-wrap: wrap; }
header.top nav a { color: var(--muted); text-decoration: none; font-size: .92rem; }
header.top nav a:hover { color: var(--accent); }
main {
  flex: 1;
  max-width: 720px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 24px 60px;
}
h1 { font-size: 1.9rem; letter-spacing: -0.02em; line-height: 1.25; margin-bottom: 12px; }
.lead { color: var(--muted); font-size: 1.05rem; margin-bottom: 28px; }
h2 { font-size: 1.2rem; margin: 28px 0 10px; }
p, li { color: #333a4d; margin-bottom: 14px; }
ul { padding-left: 24px; margin-bottom: 14px; }
li { margin-bottom: 8px; }
a { color: var(--accent); }
.panel {
  background: var(--card);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: 0 1px 3px rgba(28,35,51,.08), 0 8px 24px rgba(28,35,51,.06);
  margin: 20px 0;
}
.panel p:last-child { margin-bottom: 0; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff !important;
  text-decoration: none;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 8px;
  margin-top: 4px;
}
.btn:hover { filter: brightness(1.08); }
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); margin: 0 8px; }
footer a:hover { color: var(--accent); }