:root {
  --bg-primary: #070708;
  --bg-secondary: #0d0d0f;
  --bg-card: #111114;
  --bg-card-hover: #151519;
  --border: rgba(255, 255, 255, 0.07);
  --border-light: rgba(255, 255, 255, 0.12);
  --text-primary: #ffffff;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --accent-glow: rgba(59, 130, 246, 0.25);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --container: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(7, 7, 8, 0.72);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
}

.logo-icon {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-light);
}

.logo-icon svg {
  width: 100%;
  height: 100%;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
}

.cart-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.cart-btn:hover {
  border-color: var(--border-light);
  color: var(--text-primary);
  background: var(--bg-card);
}

/* Hero */
.hero {
  padding: 150px 0 90px;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(59, 130, 246, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 50% 30%, rgba(59, 130, 246, 0.05), transparent);
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.22);
  border-radius: 100px;
  color: var(--accent-light);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 28px;
  letter-spacing: 0.05em;
}

.hero-title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  margin-bottom: 24px;
}

.title-white {
  font-size: 52px;
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.1;
}

.title-blue {
  font-size: 42px;
  font-weight: 800;
  letter-spacing: 0.02em;
  background: linear-gradient(135deg, var(--accent-light) 0%, #2563eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.hero-desc {
  max-width: 640px;
  margin: 0 auto 64px;
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* 信息卡片 */
.info-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  text-align: left;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: all 0.35s ease;
}

.info-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}

.card-icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-light);
}

.card-title {
  font-size: 20px;
  font-weight: 700;
}

.info-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.info-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.info-row dt {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 400;
}

.info-row dd {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 400;
}

/* 通用 section */
section {
  padding: 90px 0;
}

.section-badge {
  display: inline-flex;
  padding: 7px 16px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.18);
  border-radius: 100px;
  color: var(--accent-light);
  font-size: 12px;
  font-weight: 500;
  margin-bottom: 20px;
  letter-spacing: 0.06em;
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  text-align: center;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.section-desc {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 60px;
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
}

/* 成长足迹 */
.timeline-section {
  background: var(--bg-secondary);
}

.timeline-section .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.timeline {
  position: relative;
  width: 100%;
  max-width: 800px;
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.timeline-line {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, transparent 0%, var(--accent) 15%, var(--accent) 85%, transparent 100%);
  opacity: 0.35;
}

.timeline-item {
  position: relative;
  width: 50%;
  display: flex;
  align-items: center;
}

.timeline-item.left {
  padding-right: 50px;
  justify-content: flex-end;
}

.timeline-item.right {
  align-self: flex-end;
  padding-left: 50px;
  justify-content: flex-start;
}

.timeline-dot {
  position: absolute;
  top: 50%;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-secondary);
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-50%);
  z-index: 2;
}

.timeline-item.left .timeline-dot {
  right: -7px;
}

.timeline-item.right .timeline-dot {
  left: -7px;
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 26px;
  max-width: 320px;
  transition: all 0.35s ease;
}

.timeline-card:hover {
  border-color: var(--border-light);
  transform: translateY(-3px);
}

.timeline-year {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(59, 130, 246, 0.12);
  border-radius: 100px;
  color: var(--accent-light);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 14px;
}

.timeline-card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.timeline-card-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 专业团队 */
.team-section {
  background: var(--bg-primary);
}

.team-section .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  width: 100%;
}

.team-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 40px 28px;
  text-align: center;
  transition: all 0.35s ease;
}

.team-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
  transform: translateY(-6px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.team-avatar {
  width: 76px;
  height: 76px;
  margin: 0 auto 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  color: var(--accent-light);
}

.team-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 6px;
}

.team-role {
  font-size: 13px;
  color: var(--accent-light);
  font-weight: 500;
  margin-bottom: 16px;
}

.team-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 我们的承诺 */
.promise-section {
  background: var(--bg-secondary);
}

.promise-section .container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.promise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  width: 100%;
}

.promise-card {
  text-align: center;
  padding: 44px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all 0.35s ease;
}

.promise-card:hover {
  border-color: var(--border-light);
  transform: translateY(-5px);
}

.promise-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  color: var(--accent-light);
}

.promise-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.promise-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Footer */
.footer {
  background: #030304;
  border-top: 1px solid var(--border);
  padding: 70px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1.2fr 1fr;
  gap: 48px;
  margin-bottom: 60px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.footer-logo .logo-icon {
  width: 30px;
  height: 30px;
}

.footer-logo-text {
  font-size: 16px;
  font-weight: 700;
}

.footer-text {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.footer-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.footer-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-list li {
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.footer-icon {
  flex-shrink: 0;
  margin-top: 1px;
}

.footer-list.links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-list.links a:hover {
  color: var(--accent-light);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--text-muted);
}

/* 淡入动画 */
.fade-ready {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in {
  opacity: 1;
  transform: translateY(0);
}

/* 响应式 */
@media (max-width: 992px) {
  .info-cards,
  .team-grid,
  .promise-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    gap: 22px;
  }

  .title-white {
    font-size: 36px;
  }

  .title-blue {
    font-size: 28px;
  }

  .timeline-line {
    left: 18px;
  }

  .timeline-item,
  .timeline-item.left,
  .timeline-item.right {
    width: 100%;
    padding-left: 50px;
    padding-right: 0;
    justify-content: flex-start;
    align-self: flex-start;
  }

  .timeline-item.left .timeline-dot,
  .timeline-item.right .timeline-dot {
    left: 11px;
    right: auto;
  }

  .timeline-card {
    max-width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
}