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

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: #1f2328;
  background: #ffffff;
  line-height: 1.6;
}

img {
  max-width: 100%;
  display: block;
  border-radius: 14px;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.header-top {
  background: #0f172a;
  color: #e2e8f0;
  font-size: 12px;
}

.header-top-inner {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  gap: 8px;
  flex-wrap: wrap;
}

.header-main {
  border-bottom: 1px solid #eef1f4;
  background: #ffffff;
}

.header-main-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 12px;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.logo img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
}

.logo-text {
  font-size: 18px;
}

.nav {
  display: flex;
  gap: 16px;
  font-size: 14px;
  color: #4a4f55;
  flex-wrap: wrap;
}

.nav .active {
  color: #0b5cff;
  font-weight: 600;
}

.search-box {
  background: #f8fafc;
  padding: 16px 0;
}

.search-form {
  display: flex;
  gap: 8px;
}

.search-input {
  flex: 1;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid #d5dbe2;
  font-size: 14px;
}

.search-btn {
  border: none;
  background: #0b5cff;
  color: #ffffff;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 14px;
}

.hero-banner {
  background: linear-gradient(135deg, #0b5cff, #1e293b);
  color: #ffffff;
  padding: 56px 0;
}

.hero-content {
  text-align: center;
  display: grid;
  gap: 14px;
}

.hero-title {
  font-size: 32px;
}

.hero-subtitle {
  font-size: 16px;
  color: #dbeafe;
}

.hero-btn {
  display: inline-block;
  background: #ffffff;
  color: #0b5cff;
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 600;
  width: fit-content;
  margin: 0 auto;
}

.section {
  padding: 40px 0;
}

.section-alt {
  background: #f8fafc;
}

.section-title {
  margin-bottom: 20px;
}

.section-title h2 {
  font-size: 22px;
  margin-bottom: 6px;
}

.section-title p {
  color: #4a4f55;
  font-size: 14px;
}

.page-hero {
  padding: 36px 0;
  background: #eef2ff;
}

.page-hero .hero-content {
  text-align: left;
  gap: 10px;
}

.breadcrumb {
  font-size: 12px;
  color: #6b7280;
}

.tag-list {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.tag {
  padding: 6px 10px;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid #d5dbe2;
  font-size: 12px;
  color: #4a4f55;
}

.content-grid,
.stat-grid,
.contact-grid,
.form-grid {
  display: grid;
  gap: 16px;
}

.content-card,
.stat-card {
  background: #ffffff;
  border: 1px solid #e7ebf0;
  border-radius: 16px;
  padding: 16px;
}

.content-card h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

.timeline {
  display: grid;
  gap: 14px;
}

.timeline-item {
  border-left: 3px solid #0b5cff;
  padding-left: 12px;
}

.pricing-grid {
  display: grid;
  gap: 16px;
}

.pricing-card {
  border: 1px solid #e7ebf0;
  background: #ffffff;
  border-radius: 16px;
  padding: 18px;
}

.pricing-card h3 {
  margin-bottom: 6px;
}

.pricing-card .price {
  font-size: 24px;
  color: #0b5cff;
  font-weight: 700;
  margin: 10px 0;
}

.contact-grid .contact-card {
  background: #ffffff;
  border: 1px solid #e7ebf0;
  border-radius: 16px;
  padding: 16px;
}

.form-grid input,
.form-grid textarea,
.form-grid select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #d5dbe2;
  font-size: 14px;
}

.form-grid label {
  font-size: 13px;
  color: #4a4f55;
}

.form-actions {
  display: flex;
  justify-content: flex-start;
}

.form-actions button {
  border: none;
  background: #0b5cff;
  color: #ffffff;
  padding: 12px 18px;
  border-radius: 10px;
  font-weight: 600;
}

.video-grid,
.service-grid,
.features-grid,
.expert-grid,
.reviews-grid {
  display: grid;
  gap: 16px;
}

.video-card,
.service-item,
.feature-item,
.expert-card,
.review-card {
  background: #ffffff;
  border: 1px solid #e7ebf0;
  border-radius: 16px;
  padding: 14px;
}

.video-thumb {
  position: relative;
  margin-bottom: 12px;
}

.video-duration,
.video-tag {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0, 0, 0, 0.6);
  color: #ffffff;
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 12px;
}

.video-tag {
  top: 8px;
  bottom: auto;
  right: 8px;
}

.video-tag.live {
  background: #ef4444;
}

.video-tag.hot {
  background: #f59e0b;
}

.video-info h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.video-meta {
  display: flex;
  justify-content: space-between;
  color: #6b7280;
  font-size: 12px;
}

.service-item img,
.expert-card img {
  margin-bottom: 10px;
}

.features-grid .feature-item {
  text-align: center;
}

.feature-icon {
  font-size: 26px;
  margin-bottom: 8px;
}

.expert-card h3 {
  margin: 10px 0 4px;
}

.review-author {
  font-weight: 600;
  margin-bottom: 6px;
}

.review-stars {
  color: #f59e0b;
  margin-bottom: 6px;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  background: #ffffff;
  border: 1px solid #e7ebf0;
  border-radius: 12px;
  padding: 12px 14px;
}

.faq-item summary {
  font-weight: 600;
  cursor: pointer;
}

.faq-item p {
  margin-top: 8px;
  color: #4a4f55;
}

.qrcode-grid {
  display: grid;
  gap: 16px;
  text-align: center;
}

.qrcode-item img {
  width: 180px;
  margin: 0 auto 8px;
}

.footer {
  background: #0f172a;
  color: #d5dbe2;
  padding: 32px 0 20px;
}

.footer-grid {
  display: grid;
  gap: 18px;
  margin-bottom: 16px;
}

.footer-grid h4 {
  margin-bottom: 8px;
  color: #ffffff;
}

.footer-grid a {
  display: block;
  color: #d5dbe2;
  font-size: 14px;
  margin-bottom: 6px;
}

.footer-logo {
  width: 48px;
  height: 48px;
  margin-bottom: 10px;
  border-radius: 12px;
}

.footer-bottom {
  border-top: 1px solid #1f2937;
  padding-top: 12px;
  font-size: 12px;
  color: #9aa3ad;
  text-align: center;
  display: grid;
  gap: 6px;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 40px;
  }

  .video-grid,
  .features-grid,
  .reviews-grid,
  .qrcode-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .service-grid,
  .expert-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .content-grid,
  .stat-grid,
  .contact-grid,
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .video-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .features-grid,
  .reviews-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .content-grid,
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}