* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  scroll-behavior: smooth;
}
:root {
  --primary: #00C066;
  --secondary: #00A0EE;
  --third: #64E9EE;
  --bg-dark: #05080F;
  --bg-card: #0F1624;
  --text: #E6EDF7;
  --text-secondary: #8B98A8;
  --border: #1B2436;
}
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: 32px;
  margin-bottom: 40px;
  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: -25px auto 35px;
  font-size: 15px;
}
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 8px;
  font-weight: 500;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
  font-size: 15px;
}
.btn-primary {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: #fff;
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 25px rgba(0,160,238,0.25);
}

/* 导航 */
.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(15,22,36,0.96);
  backdrop-filter: blur(12px);
  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: 28px;
  list-style: none;
}
.nav-menu a {
  color: var(--text-secondary);
  transition: 0.3s;
}
.nav-menu a:hover {
  color: var(--primary);
}

/* 首屏 */
.hero {
  padding: 80px 0 90px;
  background: radial-gradient(circle at 50% 30%, rgba(0,160,238,0.07), transparent 70%);
  text-align: center;
}
.hero h1 {
  font-size: 42px;
  margin-bottom: 18px;
  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: 16px;
  color: var(--text-secondary);
  max-width: 950px;
  margin: 0 auto 25px;
}
.test-info {
  display: inline-block;
  background: var(--bg-card);
  padding: 10px 22px;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 18px;
  color: var(--third);
  font-size: 15px;
}

/* 套餐 */
.packages {
  padding: 70px 0;
  background: var(--bg-card);
}
.pack-table-wrapper {
  width: 100%;
  overflow-x: auto;
  border-radius: 10px;
}
.pack-table {
  width: 100%;
  min-width: 950px;
  border-collapse: collapse;
  background: var(--bg-dark);
  border-radius: 10px;
  overflow: hidden;
}
.pack-table th {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: #fff;
  padding: 15px;
  text-align: center;
  font-weight: 500;
  white-space: nowrap;
}
.pack-table td {
  padding: 15px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  white-space: nowrap;
}
.pack-table tr:hover {
  background: rgba(0,192,102,0.05);
}
.price {
  color: var(--third);
  font-weight: bold;
  font-size: 16px;
}
.buy-btn {
  padding: 7px 14px;
  background: var(--primary);
  color: #fff;
  border-radius: 5px;
  font-size: 14px;
}

/* 优势 */
.advantages {
  padding: 70px 0;
}
.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 25px;
}
.adv-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 30px 22px;
  transition: 0.3s;
}
.adv-card:hover {
  border-color: var(--secondary);
  transform: translateY(-4px);
}
.adv-card h3 {
  margin-bottom: 10px;
  font-size: 18px;
  color: var(--text);
}
.adv-card p {
  color: var(--text-secondary);
  font-size: 14px;
}

/* 产品介绍 */
.info {
  padding: 70px 0;
  background: var(--bg-card);
}
.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 25px;
}
.info-item {
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 25px;
}
.info-item h3 {
  margin-bottom: 12px;
  color: var(--primary);
}
.info-item p {
  color: var(--text-secondary);
  line-height: 1.8;
}

/* 防御 */
.defense {
  padding: 70px 0;
}
.defense-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 25px;
}
.defense-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 25px;
}
.defense-box h3 {
  margin-bottom: 12px;
  color: var(--third);
}
.defense-box p {
  color: var(--text-secondary);
}

/* 场景 */
.scene {
  padding: 70px 0;
  background: var(--bg-card);
}
.scene-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.scene-card {
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 25px;
}
.scene-card h3 {
  margin-bottom: 8px;
  color: var(--primary);
}
.scene-card p {
  color: var(--text-secondary);
}

/* FAQ */
.faq {
  padding: 70px 0;
}
.faq-list {
  max-width: 900px;
  margin: 0 auto;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px 22px;
  margin-bottom: 12px;
}
.faq-item h3 {
  font-size: 15px;
  color: var(--text);
  margin-bottom: 6px;
}
.faq-item p {
  font-size: 14px;
  color: var(--text-secondary);
}

/* 售后服务卡片 */
.service {
  padding: 70px 0;
  background: radial-gradient(circle at 50% 20%, rgba(0,192,102,0.06), transparent 70%);
}
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 40px 0;
}
.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 25px 20px;
  transition: all 0.3s ease;
}
.service-card:hover {
  border-color: var(--secondary);
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(0,160,238,0.1);
}
.service-card h4 {
  font-size: 17px;
  margin-bottom: 10px;
  color: var(--primary);
}
.service-card h4::before {
  margin-right: 8px;
  font-style: normal;
}
.service-card:nth-child(1) h4::before { content: "🕒"; }
.service-card:nth-child(2) h4::before { content: "⚙️"; }
.service-card:nth-child(3) h4::before { content: "🛡️"; }
.service-card:nth-child(4) h4::before { content: "🔧"; }
.service-card:nth-child(5) h4::before { content: "📊"; }
.service-card:nth-child(6) h4::before { content: "🚚"; }
.service-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.service-btn-wrap {
  text-align: center;
  margin-top: 20px;
}

/* 页脚 */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 35px 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
}

/* 移动端 */
@media (max-width:900px) {
  .adv-grid, .info-grid, .defense-grid, .scene-grid {
    grid-template-columns: 1fr;
  }
  .service-grid { grid-template-columns: repeat(2,1fr); }
  .hero h1 { font-size: 26px; }
  .nav-menu { display: none; }
}
@media (max-width:500px) {
  .service-grid { grid-template-columns: 1fr; }
}