* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  color: #222;
  background: #f5f7fb;
}

a {
  color: #1c6df2;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

header {
  background: linear-gradient(135deg, #1c6df2, #4a8fff);
  color: #fff;
  padding: 18px 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 1px;
}

.tagline {
  font-size: 14px;
  opacity: 0.9;
}

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

nav a {
  font-size: 14px;
  color: #e8f0ff;
}

main {
  max-width: 1100px;
  margin: 24px auto 40px;
  padding: 0 16px 32px;
}

.hero {
  background: #ffffff;
  border-radius: 16px;
  padding: 26px 22px;
  box-shadow: 0 8px 24px rgba(15,35,95,0.08);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 26px;
  margin-bottom: 12px;
}

.hero p {
  font-size: 15px;
  color: #555;
  margin-bottom: 18px;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.badge {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  background: #eef3ff;
  color: #2f54eb;
}

.download-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 10px;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  background: #1c6df2;
  color: #fff;
  box-shadow: 0 4px 10px rgba(28,109,242,0.35);
}

.btn-download.secondary {
  background: #ffffff;
  color: #1c6df2;
  border: 1px solid rgba(28,109,242,0.35);
  box-shadow: none;
}

.btn-download span.small {
  font-size: 11px;
  opacity: 0.9;
  margin-left: 6px;
}

.notice {
  font-size: 12px;
  color: #888;
}

.grid {
  display: grid;
  grid-template-columns: 2.1fr 1.3fr;
  gap: 18px;
  margin-top: 18px;
}

.card {
  background: #ffffff;
  border-radius: 14px;
  padding: 18px 18px 20px;
  box-shadow: 0 6px 20px rgba(15,35,95,0.06);
}

.card h2 {
  font-size: 18px;
  margin-bottom: 10px;
}

.card h3 {
  font-size: 15px;
  margin-top: 12px;
  margin-bottom: 6px;
}

.card p {
  font-size: 14px;
  color: #444;
  margin-bottom: 6px;
}

.card ul {
  padding-left: 18px;
  margin-bottom: 6px;
}

.card li {
  font-size: 14px;
  margin-bottom: 4px;
}

.article-list {
  margin-top: 8px;
}

.article-list ul {
  list-style: none;
}

.article-list li {
  font-size: 14px;
  padding: 4px 0;
  border-bottom: 1px dashed #eee;
}

.article-meta {
  font-size: 12px;
  color: #888;
  margin-bottom: 8px;
}

.breadcrumbs {
  font-size: 13px;
  margin-bottom: 10px;
  color: #666;
}

section {
  margin-top: 18px;
}

section h2 {
  font-size: 18px;
  margin-bottom: 8px;
}

section h3 {
  font-size: 15px;
  margin-top: 10px;
  margin-bottom: 6px;
}

section p {
  font-size: 14px;
  color: #444;
  margin-bottom: 6px;
}

section ul {
  padding-left: 18px;
  margin-bottom: 6px;
}

section li {
  font-size: 14px;
  margin-bottom: 4px;
}

footer {
  border-top: 1px solid #e3e6f0;
  padding: 18px 16px 26px;
  font-size: 12px;
  color: #888;
  text-align: center;
  background: #f8f9fe;
}

footer a {
  color: #666;
}

@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .grid {
    grid-template-columns: 1fr;
  }
  .hero {
    padding: 18px 16px;
  }
  main {
    padding: 0 14px 24px;
  }
}