:root {
  --main: #0c2461;
  --accent: #4a69bd;
  --bg: #f5f7fa;
  --text: #2c3e50;
  --radius: 12px;
  --shadow: 0 4px 12px rgba(0,0,0,.08);
  --max-width: 900px;
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: 'Noto Sans SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
}
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: #fff;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand-img {
  width: 40px;
  height: 40px;
  border-radius: 10px; /* 改为圆角正方形 */
  object-fit: cover;
}
.brand-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--main);
}
.top-nav {
  display: flex;
  gap: 20px;
}
.top-nav a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}
.top-nav a.active {
  color: var(--main);
  font-weight: 700;
}
.main-content {
  padding: 24px 16px;
  max-width: var(--max-width);
  margin: 0 auto;
}
.hero {
  text-align: center;
  padding: 40px 0;
}
.hero-title {
  font-size: 32px;
  color: var(--main);
  margin-bottom: 12px;
}
.hero-subtitle {
  font-size: 18px;
  margin-bottom: 24px;
}
.cta-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 12px 32px;
  border-radius: var(--radius);
  font-size: 16px;
  cursor: pointer;
}
.section-title {
  font-size: 24px;
  margin: 40px 0 20px;
  color: var(--main);
}
.cards, .plans, .dl-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}
.card {
  flex: 1 1 260px;
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  text-align: center;
}
.card-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
}
.card-icon.rocket {
  background-image: url('rocket.png');
}
.card-icon.shield {
  background-image: url('shield.png');
}
.card-icon.phone {
  background-image: url('phone.png');
}
.plan {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  width: 260px;
  box-shadow: var(--shadow);
  position: relative;
}
.plan-popular {
  border: 2px solid var(--accent);
}
.badge {
  position: absolute;
  top: -12px;
  right: 12px;
  background: var(--accent);
  color: #fff;
  padding: 4px 12px;
  border-radius: var(--radius);
  font-size: 12px;
}
.price {
  font-size: 28px;
  font-weight: 700;
  color: var(--main);
  margin: 12px 0;
}
.price span {
  font-size: 16px;
  margin-left: 4px;
  font-weight: 400;
}
.plan ul {
  list-style: none;
  margin: 16px 0;
}
.plan li {
  margin-bottom: 8px;
}
.plan-btn {
  width: 100%;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 10px 0;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 16px;
}
.dl-btn {
  display: inline-block;
  background: var(--main);
  color: #fff;
  padding: 10px 20px;
  border-radius: var(--radius);
  margin: 6px;
  text-decoration: none;
}
.webvpn {
  text-align: center;
  padding: 40px 0;
}
.web-subtitle {
  margin-bottom: 20px;
  font-size: 18px;
}
.web-btn {
  margin-bottom: 16px;
}
.web-status {
  font-size: 14px;
  color: var(--accent);
  min-height: 20px;
}
.qr-img {
  margin-top: 16px;
  width: 140px;
}
.site-footer {
  text-align: center;
  padding: 24px 16px;
  font-size: 14px;
  color: #666;
}
.site-footer a {
  color: var(--accent);
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  font-size: 14px;
}
.compare-table th,
.compare-table td {
  padding: 12px;
  text-align: center;
  border-bottom: 1px solid #eee;
}
.compare-table th {
  background: var(--main);
  color: #fff;
  font-weight: 700;
}
.compare-table tr:nth-child(even) {
  background: #f8f9fa;
}
.compare-table tr:hover {
  background: #e8f0fe;
}
@media (max-width: 600px) {
  .hero-title {
    font-size: 24px;
  }
  .top-nav {
    display: none;
  }
  .compare-table {
    font-size: 12px;
  }
  .compare-table th,
  .compare-table td {
    padding: 8px 4px;
  }
}