* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  scroll-behavior: smooth;
}
:root {
  --primary: #1877F2;
  --secondary: #6B52FF;
  --third: #00D8FF;
  --hot: #FF4444;
  --bg-dark: #080C14;
  --bg-card: #121826;
  --text: #F0F4F9;
  --text-secondary: #8E97A6;
  --border: #232D45;
}
body {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg-dark);
  color: var(--text);
  line-height: 1.85;
  overflow-x: hidden;
}
a {
  text-decoration: none;
  color: inherit;
}
img {
  max-width: 100%;
  display: block;
}
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}
.section-title {
  text-align: center;
  font-size: 36px;
  margin-bottom: 18px;
  line-height: 1.35;
  position: relative;
  padding-bottom: 12px;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 3px;
}
.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: 920px;
  margin: 0 auto 45px;
  font-size: 15px;
  line-height: 1.9;
}
.btn {
  display: inline-block;
  padding: 15px 35px;
  border-radius: 8px;
  font-weight: 600;
  transition: all 0.35s ease;
  cursor: pointer;
  border: none;
  font-size: 16px;
}
.btn-primary {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  color: #fff;
  box-shadow: 0 4px 12px rgba(107, 82, 255, 0.2);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(107, 82, 255, 0.35);
}

.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(18,24,38,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 999;
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}
.logo {
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: 0.5px;
}
.nav-menu {
  display: flex;
  gap: 35px;
  list-style: none;
}
.nav-menu a {
  color: var(--text-secondary);
  transition: 0.35s;
  font-size: 15px;
}
.nav-menu a:hover {
  color: var(--third);
}
.mobile-btn {
  display: none;
  font-size: 26px;
  color: #fff;
  cursor: pointer;
}

.hero {
  padding: 130px 0 110px;
  background: radial-gradient(circle at 40% 25%, rgba(107,82,255,0.18), transparent 75%);
  text-align: center;
}
.hero h1 {
  font-size: 48px;
  margin-bottom: 22px;
  line-height: 1.25;
}
.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: 920px;
  margin: 0 auto 30px;
}
.test-info {
  display: inline-block;
  background: var(--bg-card);
  padding: 15px 30px;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin-bottom: 30px;
  color: var(--third);
  font-size: 16px;
  font-weight: 500;
}
.tag-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 35px;
}
.tag {
  background: rgba(24,119,242,0.12);
  border: 1px solid rgba(24,119,242,0.35);
  color: var(--third);
  padding: 8px 16px;
  border-radius: 30px;
  font-size: 14px;
}

.packages {
  padding: 90px 0;
  background: var(--bg-card);
  position: relative;
  overflow: hidden;
}
.packages::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 80% 80%, rgba(24,119,242,0.05), transparent);
  pointer-events: none;
}
.cpu-option {
  max-width: 900px;
  margin: 0 auto 25px;
  text-align: center;
  padding: 15px;
  background: var(--bg-dark);
  border-radius: 8px;
  border: 1px solid var(--border);
}
.cpu-option label {
  color: var(--text-secondary);
  margin-right: 15px;
  font-size: 14px;
}
.cpu-option span {
  display: inline-block;
  padding: 5px 12px;
  margin: 0 8px;
  background: rgba(24,119,242,0.1);
  border-radius: 4px;
  font-size: 13px;
  color: var(--text);
}
.pack-table-wrapper {
  width: 100%;
  overflow-x: auto;
  border-radius: 12px;
}
.pack-table {
  width: 100%;
  min-width: 1000px;
  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: 20px;
  text-align: center;
  font-weight: 600;
  white-space: nowrap;
  font-size: 15px;
}
.pack-table td {
  padding: 20px;
  text-align: center;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  white-space: nowrap;
  position: relative;
}
.pack-table tr:hover {
  background: rgba(24,119,242,0.09);
}
.price {
  color: var(--third);
  font-weight: bold;
  font-size: 19px;
}
.hot-label {
  position: absolute;
  top: -10px;
  right: 15px;
  background: var(--hot);
  color: #fff;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 30px;
  box-shadow: 0 2px 8px rgba(255,68,68,0.3);
}
.buy-btn {
  padding: 11px 22px;
  background: var(--primary);
  color: #fff;
  border-radius: 6px;
  font-size: 14px;
  white-space: nowrap;
  transition: 0.35s;
}
.buy-btn:hover {
  background: var(--secondary);
  transform: translateY(-2px);
}

.advantages { 
  padding: 90px 0; 
  position: relative;
}
.advantages::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 50%;
  background: radial-gradient(circle at 20% 80%, rgba(107,82,255,0.06), transparent);
  pointer-events: none;
}
.adv-grid { 
  display: grid; 
  grid-template-columns: repeat(3, 1fr); 
  gap: 35px;
}
.adv-card { 
  background: var(--bg-card); 
  border: 1px solid var(--border); 
  border-radius: 15px;
  padding: 40px 30px;
  transition: 0.35s; 
  position: relative;
  overflow: hidden;
}
.adv-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: 0.35s;
}
.adv-card:hover { 
  border-color: var(--secondary); 
  transform: translateY(-6px);
  box-shadow: 0 10px 30px rgba(107,82,255,0.18);
}
.adv-card:hover::before {
  opacity: 1;
}
.adv-card h3 { 
  margin-bottom: 15px;
  font-size: 20px;
  color: var(--text); 
}
.adv-card p { 
  color: var(--text-secondary); 
  font-size: 15px; 
  line-height: 1.9;
}

.compare { 
  padding: 90px 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: 18px;
  text-align: center; 
  border-bottom: 1px solid var(--border); 
}
.compare-table th { 
  background: var(--primary); 
  color: #fff; 
  font-weight: 600;
}
.good { 
  color: #00D8FF; 
  font-weight: bold; 
  font-size: 15px;
}
.bad { 
  color: #ff5252; 
  font-size: 15px;
}

.scene { 
  padding: 90px 0; 
}
.scene-grid { 
  display: grid; 
  grid-template-columns: repeat(2, 1fr); 
  gap: 30px;
}
.scene-card { 
  background: var(--bg-card); 
  border: 1px solid var(--border); 
  border-radius: 15px;
  padding: 35px;
  transition: 0.35s;
}
.scene-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}
.scene-card h3 { 
  margin-bottom: 12px;
  color: var(--primary); 
  font-size: 19px;
}
.scene-card p { 
  color: var(--text-secondary); 
  line-height: 1.9;
}

.faq { 
  padding: 90px 0; 
  background: var(--bg-card); 
}
.faq-list { 
  max-width: 920px; 
  margin: 0 auto; 
}
.faq-item { 
  background: var(--bg-dark); 
  border: 1px solid var(--border); 
  border-radius: 12px;
  padding: 25px 28px;
  margin-bottom: 18px;
  transition: 0.35s;
}
.faq-item:hover {
  border-color: var(--primary);
}
.faq-item h3 { 
  font-size: 17px;
  margin-bottom: 10px; 
  color: var(--text); 
}
.faq-item p { 
  font-size: 14px; 
  color: var(--text-secondary); 
  line-height: 1.9;
}

.service { 
  padding: 90px 0; 
  text-align: center; 
}
.service p { 
  max-width: 920px; 
  margin: 0 auto; 
  color: var(--text-secondary); 
  line-height: 2.3; 
  font-size: 16px; 
}

.footer { 
  background: var(--bg-card); 
  border-top: 1px solid var(--border); 
  padding: 45px 0;
  text-align: center; 
  color: var(--text-secondary); 
  font-size: 14px; 
}

.back-top {
  position: fixed; 
  right: 25px;
  bottom: 35px; 
  width: 48px;
  height: 48px;
  background: linear-gradient(180deg, var(--primary), var(--secondary));
  color: #fff; 
  border-radius: 50%;
  display: flex; 
  align-items: center; 
  justify-content: center;
  z-index: 99; 
  opacity: 0; 
  transition: 0.35s; 
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(24,119,242,0.3);
}
.back-top.show { 
  opacity: 1; 
}

@media (max-width:900px) {
  .adv-grid, .scene-grid { 
    grid-template-columns: 1fr; 
  }
  .hero h1 { 
    font-size: 32px; 
  }
  .nav-menu { 
    display: none; 
  }
  .mobile-btn { 
    display: block; 
  }
  .nav-menu.active {
    display: flex !important; 
    position: absolute; 
    top: 72px; 
    left: 0; 
    width: 100%;
    background: #121826; 
    flex-direction: column; 
    padding: 25px;
    gap: 18px;
  }
  .tag { 
    font-size: 12px; 
    padding: 6px 12px; 
  }
  .section-title {
    font-size: 28px;
  }
  .cpu-option span {
    margin: 5px 4px;
  }
}