:root {
  --bg: #f7f8fc;
  --surface: #ffffff;
  --text: #1b1f2e;
  --muted: #6b7280;
  --primary: #4361ee;
  --border: #e5e7eb;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
}

.logo {
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9375rem;
}

.nav a:hover { color: var(--primary); }

.main {
  flex: 1;
  padding: 2rem 1.25rem 3rem;
}

.main h1 {
  margin: 0 0 0.75rem;
  font-size: 1.75rem;
}

.lead {
  color: var(--muted);
  margin: 0 0 2rem;
}

.section {
  margin-bottom: 2.5rem;
}

.section h2 {
  font-size: 1.125rem;
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.faq dt {
  font-weight: 600;
  margin: 1.25rem 0 0.35rem;
}

.faq dt:first-child { margin-top: 0; }

.faq dd {
  margin: 0;
  color: var(--muted);
}

.links {
  padding-left: 1.25rem;
  margin: 0;
}

.links a { color: var(--primary); }

.muted { color: var(--muted); font-size: 0.9375rem; }

.footer {
  border-top: 1px solid var(--border);
  padding: 1rem 1.25rem;
  background: var(--surface);
  font-size: 0.875rem;
  color: var(--muted);
}

.footer__inner {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

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