* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  scroll-behavior: smooth;
}
:root {
  --primary: #165DFF;
  --secondary: #7B61FF;
  --third: #00CFFB;
  --hot: #FF3C3C;
  --bg-dark: #0A0E17;
  --bg-card: #141925;
  --text: #E5E9F2;
  --text-secondary: #86909C;
  --border: #252F48;
}
body {
  font-family: "Microsoft YaHei", sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  line-height: 1.8;
  overflow-x: hidden;
}
a {
  text-decoration: none;
  color: inherit;
}
img {
  max-width: 100%;
  display: block;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.section-title {
  text-align: center;
  font-size: 34px;
  margin-bottom: 15px;
  line-height: 1.4;
}
.section-title span {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section-desc {
  text-align: center;
  color: var(--text-secondary);
  max-width: 900px;
  margin: 0 auto 40px;
  font-size: 15px;
}
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 6px;
  font-weight: 500;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
  font-size: 16px;
}
.btn-primary {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: #fff;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(123,97,255,0.4);
}

.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(20,25,37,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 999;
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}
.logo {
  font-size: 22px;
  font-weight: bold;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.nav-menu {
  display: flex;
  gap: 30px;
  list-style: none;
}
.nav-menu a {
  color: var(--text-secondary);
  transition: 0.3s;
}
.nav-menu a:hover {
  color: var(--primary);
}
.mobile-btn {
  display: none;
  font-size: 24px;
  color: #fff;
  cursor: pointer;
}

.hero {
  padding: 120px 0 100px;
  background: radial-gradient(circle at 50% 30%, rgba(123,97,255,0.15), transparent 70%);
  text-align: center;
}
.hero h1 {
  font-size: 46px;
  margin-bottom: 20px;
  line-height: 1.3;
}
.hero h1 span {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 900px;
  margin: 0 auto 25px;
}
.test-info {
  display: inline-block;
  background: var(--bg-card);
  padding: 12px 28px;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 25px;
  color: var(--third);
  font-size: 16px;
}
.tag-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 30px;
}
.tag {
  background: rgba(22,93,255,0.1);
  border: 1px solid rgba(22,93,255,0.3);
  color: var(--third);
  padding: 6px 14px;
  border-radius: 30px;
  font-size: 14px;
}

.packages {
  padding: 80px 0;
  background: var(--bg-card);
}
.pack-table-wrapper {
  width: 100%;
  overflow-x: auto;
  border-radius: 12px;
}
.pack-table {
  width: 100%;
  min-width: 950px;
  border-collapse: collapse;
  background: var(--bg-dark);
  border-radius: 12px;
  overflow: hidden;
}
.pack-table th {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: #fff;
  padding: 18px;
  text-align: center;
  font-weight: 500;
  white-space: nowrap;
  font-size: 15px;
}
.pack-table td {
  padding: 18px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  white-space: nowrap;
  position: relative;
}
.pack-table tr:hover {
  background: rgba(22,93,255,0.08);
}
.price {
  color: var(--third);
  font-weight: bold;
  font-size: 18px;
}
.hot-label {
  position: absolute;
  top: -8px;
  right: 10px;
  background: var(--hot);
  color: #fff;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 30px;
}
.buy-btn {
  padding: 10px 20px;
  background: var(--primary);
  color: #fff;
  border-radius: 4px;
  font-size: 14px;
  white-space: nowrap;
  transition: 0.3s;
}
.buy-btn:hover {
  background: var(--secondary);
}

.advantages { padding: 80px 0; }
.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.adv-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 35px 25px; transition: 0.3s; }
.adv-card:hover { border-color: var(--secondary); transform: translateY(-5px); box-shadow: 0 8px 25px rgba(123,97,255,0.15); }
.adv-card h3 { margin-bottom: 12px; font-size: 19px; color: var(--text); }
.adv-card p { color: var(--text-secondary); font-size: 15px; }

.compare { padding: 80px 0; background: var(--bg-card); }
.compare-table { width: 100%; border-collapse: collapse; background: var(--bg-dark); border-radius: 12px; overflow: hidden; }
.compare-table th, .compare-table td { padding: 16px; text-align: center; border-bottom: 1px solid var(--border); }
.compare-table th { background: var(--primary); color: #fff; }
.good { color: #00CFFB; font-weight: bold; }
.bad { color: #ff4d4f; }

.scene { padding: 80px 0; }
.scene-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 25px; }
.scene-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 30px; }
.scene-card h3 { margin-bottom: 10px; color: var(--primary); font-size: 18px; }
.scene-card p { color: var(--text-secondary); }

.faq { padding: 80px 0; background: var(--bg-card); }
.faq-list { max-width: 900px; margin: 0 auto; }
.faq-item { background: var(--bg-dark); border: 1px solid var(--border); border-radius: 10px; padding: 22px 25px; margin-bottom: 15px; }
.faq-item h3 { font-size: 16px; margin-bottom: 8px; color: var(--text); }
.faq-item p { font-size: 14px; color: var(--text-secondary); }

.service { padding: 80px 0; text-align: center; }
.service p { max-width: 900px; margin: 0 auto; color: var(--text-secondary); line-height: 2.2; font-size: 16px; }

.footer { background: var(--bg-card); border-top: 1px solid var(--border); padding: 40px 0; text-align: center; color: var(--text-secondary); font-size: 14px; }

.back-top {
  position: fixed; right: 20px; bottom: 30px; width: 45px; height: 45px;
  background: var(--primary); color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  z-index: 99; opacity: 0; transition: 0.3s; cursor: pointer;
}
.back-top.show { opacity: 1; }

@media (max-width:900px) {
  .adv-grid, .scene-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
  .nav-menu { display: none; }
  .mobile-btn { display: block; }
  .nav-menu.active {
    display: flex !important; position: absolute; top: 70px; left: 0; width: 100%;
    background: #141925; flex-direction: column; padding: 20px; gap: 15px;
  }
  .tag { font-size: 12px; padding: 4px 10px; }
}

/* 资讯列表 */
.article-list {display: grid;grid-template-columns: repeat(3, 1fr);gap: 28px;margin-top: 20px;}
.article-item {background: var(--bg-card);border: 1px solid var(--border);border-radius: 16px;padding: 28px;transition: 0.35s;}
.article-item:hover {transform: translateY(-6px);border-color: var(--secondary);box-shadow:0 10px 25px rgba(0,0,0,0.2);}
.article-item h4 {font-size: 17px;margin-bottom: 14px;line-height: 1.5;}
.article-item p {color: var(--text-secondary);font-size: 14px;line-height: 1.7;margin-bottom: 14px;}
.article-meta {font-size: 12px;color: var(--text-secondary);display: flex;gap: 12px;}