:root {
  color-scheme: light;
  --red: #e83b42;
  --red-dark: #c92d34;
  --text: #1f2937;
  --muted: #667085;
  --line: #e5e7eb;
  --bg: #f6f7f9;
  --card: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.72;
}

a {
  color: var(--red-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.topbar {
  background: linear-gradient(135deg, #ff5a5f 0%, #e83b42 55%, #b91c1c 100%);
  color: white;
}

.topbar-inner {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 24px;
}

.brand {
  margin: 0;
  font-size: 28px;
  line-height: 1.2;
}

.tagline {
  margin: 8px 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: 15px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.nav a {
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 14px;
}

.page {
  width: min(960px, calc(100% - 32px));
  margin: 18px auto 40px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 24px;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.06);
}

h2 {
  margin: 0 0 12px;
  font-size: 24px;
  line-height: 1.3;
}

h3 {
  margin: 26px 0 8px;
  font-size: 17px;
}

p {
  margin: 8px 0;
}

ul {
  margin: 8px 0 0;
  padding-left: 22px;
}

li + li {
  margin-top: 4px;
}

.muted {
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.mini-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #fff;
}

.mini-card strong {
  display: block;
  margin-bottom: 4px;
}

.footer {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto 32px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 600px) {
  .topbar-inner {
    padding: 24px 0 20px;
  }

  .brand {
    font-size: 24px;
  }

  .card {
    padding: 18px;
  }
}