:root {
  --primary-blue: #0b57d0;
  --vivid-blue: #1a73e8;
  --accent-cyan: #00c6ff;
  --dark-navy: #0f172a;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --border-light: #e2e8f0;
  --shadow-sm: 0 2px 4px rgba(11, 87, 208, 0.04);
  --shadow-md: 0 10px 25px -5px rgba(11, 87, 208, 0.08), 0 8px 10px -6px rgba(11, 87, 208, 0.04);
  --shadow-lg: 0 20px 30px -10px rgba(11, 87, 208, 0.12);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-page);
  line-height: 1.6;
}
body {
  overflow-x: hidden;
  position: relative;
  background: linear-gradient(180deg, #f0f7ff 0%, #f8fafc 400px, #ffffff 100%);
}
.site-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
header.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transition: var(--transition);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand-box {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-box img.ai-page-logo {
  height: 38px;
  width: auto;
  display: block;
}
.nav-wrapper {
  display: flex;
  align-items: center;
}
.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0;
}
.nav-links li a {
  display: inline-block;
  padding: 8px 14px;
  color: var(--text-main);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
  border-radius: 6px;
}
.nav-links li a:hover {
  color: var(--vivid-blue);
  background-color: #eff6ff;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.btn-primary-sm {
  background: linear-gradient(135deg, var(--vivid-blue), var(--primary-blue));
  color: #ffffff !important;
  padding: 8px 18px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(26, 115, 232, 0.25);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn-primary-sm:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(26, 115, 232, 0.35);
}
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--text-main);
  cursor: pointer;
  padding: 4px;
}
.hero-section {
  padding: 80px 0 60px;
  position: relative;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: #e8f0fe;
  color: var(--vivid-blue);
  font-size: 13px;
  font-weight: 600;
  border-radius: 999px;
  margin-bottom: 24px;
  border: 1px solid #d2e3fc;
}
.hero-title {
  font-size: 40px;
  font-weight: 800;
  color: var(--dark-navy);
  letter-spacing: -0.5px;
  line-height: 1.3;
  margin-bottom: 20px;
}
.hero-desc {
  max-width: 820px;
  margin: 0 auto 36px;
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.7;
}
.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}
.btn-hero-main {
  background: linear-gradient(135deg, #1a73e8 0%, #0b57d0 100%);
  color: #ffffff;
  padding: 14px 34px;
  font-size: 16px;
  font-weight: 700;
  border-radius: 8px;
  text-decoration: none;
  box-shadow: 0 10px 20px rgba(26, 115, 232, 0.3);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-hero-main:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px rgba(26, 115, 232, 0.4);
}
.btn-hero-outline {
  background: #ffffff;
  color: var(--primary-blue);
  padding: 14px 30px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  border: 1.5px solid #d2e3fc;
  transition: var(--transition);
}
.btn-hero-outline:hover {
  background: #f0f7ff;
  border-color: var(--vivid-blue);
}
.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 20px;
}
.stat-card {
  background: #ffffff;
  padding: 24px 16px;
  border-radius: 12px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #bfdbfe;
}
.stat-value {
  font-size: 32px;
  font-weight: 800;
  color: var(--vivid-blue);
  margin-bottom: 6px;
}
.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}
.section-block {
  padding: 70px 0;
  position: relative;
}
.section-alt-bg {
  background: #f8fafc;
  border-top: 1px solid #edf2f7;
  border-bottom: 1px solid #edf2f7;
}
.section-head {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 50px;
}
.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--vivid-blue);
  text-transform: uppercase;
  letter-spacing: 1px;
  background: #eff6ff;
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 12px;
}
.section-title {
  font-size: 30px;
  font-weight: 700;
  color: var(--dark-navy);
  margin-bottom: 14px;
  line-height: 1.3;
}
.section-subtitle {
  font-size: 15px;
  color: var(--text-muted);
}
.intro-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
}
.intro-text-card {
  background: #ffffff;
  padding: 36px;
  border-radius: 16px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}
.intro-text-card p {
  margin-bottom: 16px;
  font-size: 15px;
  color: #475569;
  line-height: 1.8;
}
.model-tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}
.model-tag-pill {
  font-size: 12px;
  padding: 6px 12px;
  background: #eff6ff;
  color: var(--primary-blue);
  border-radius: 6px;
  font-weight: 500;
  border: 1px solid #dbeafe;
}
.intro-feature-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.feature-item-row {
  display: flex;
  gap: 16px;
  background: #ffffff;
  padding: 20px;
  border-radius: 12px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.feature-item-row:hover {
  transform: translateX(4px);
  border-color: #bfdbfe;
}
.feature-icon-box {
  width: 44px;
  height: 44px;
  background: #e8f0fe;
  color: var(--vivid-blue);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 18px;
  flex-shrink: 0;
}
.feature-item-row h3 {
  font-size: 16px;
  color: var(--dark-navy);
  margin-bottom: 4px;
}
.feature-item-row p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}
.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.cards-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.service-card {
  background: #ffffff;
  padding: 28px;
  border-radius: 14px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #bfdbfe;
}
.service-card-tag {
  font-size: 11px;
  color: var(--vivid-blue);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.service-card h3 {
  font-size: 18px;
  color: var(--dark-navy);
  margin-bottom: 10px;
}
.service-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  flex-grow: 1;
}
.flow-steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.flow-step-card {
  background: #ffffff;
  padding: 24px;
  border-radius: 12px;
  border: 1px solid var(--border-light);
  position: relative;
}
.flow-step-num {
  font-size: 28px;
  font-weight: 800;
  color: #bfdbfe;
  line-height: 1;
  margin-bottom: 12px;
}
.flow-step-card h3 {
  font-size: 16px;
  color: var(--dark-navy);
  margin-bottom: 8px;
}
.flow-step-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}
.gallery-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  margin-bottom: 24px;
}
.media-card {
  background: #ffffff;
  padding: 16px;
  border-radius: 14px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}
.media-card img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  display: block;
}
.media-card-info {
  margin-top: 12px;
}
.media-card-info h3 {
  font-size: 15px;
  color: var(--dark-navy);
  margin-bottom: 4px;
}
.media-card-info p {
  font-size: 12px;
  color: var(--text-muted);
}
.table-wrapper {
  background: #ffffff;
  border-radius: 14px;
  border: 1px solid var(--border-light);
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
}
.benchmark-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
  min-width: 650px;
}
.benchmark-table th, .benchmark-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-light);
}
.benchmark-table th {
  background: #f8fafc;
  color: var(--dark-navy);
  font-weight: 700;
}
.benchmark-table tr.highlight-row {
  background: #f0f7ff;
}
.benchmark-table tr.highlight-row td {
  color: var(--primary-blue);
  font-weight: 600;
}
.badge-score {
  display: inline-block;
  background: #eff6ff;
  color: var(--vivid-blue);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
  border: 1px solid #bfdbfe;
}
.form-card {
  max-width: 780px;
  margin: 0 auto;
  background: #ffffff;
  padding: 40px;
  border-radius: 16px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}
.form-group-full {
  grid-column: 1 / -1;
}
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--dark-navy);
  margin-bottom: 6px;
}
.form-control {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  font-size: 14px;
  background: #f8fafc;
  transition: var(--transition);
}
.form-control:focus {
  outline: none;
  border-color: var(--vivid-blue);
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.12);
}
textarea.form-control {
  resize: vertical;
  min-height: 100px;
}
.btn-submit {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--vivid-blue), var(--primary-blue));
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 6px 16px rgba(26, 115, 232, 0.25);
  transition: var(--transition);
}
.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(26, 115, 232, 0.35);
}
.faq-accordion {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: #ffffff;
  border-radius: 10px;
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover {
  border-color: #bfdbfe;
}
.faq-header {
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  background: #ffffff;
  user-select: none;
}
.faq-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--dark-navy);
}
.faq-icon {
  font-size: 18px;
  color: var(--vivid-blue);
  transition: var(--transition);
}
.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
  background: #f8fafc;
}
.faq-body-content {
  padding: 16px 20px;
  font-size: 14px;
  color: #475569;
  line-height: 1.7;
  border-top: 1px solid #edf2f7;
}
.faq-item.active .faq-body {
  max-height: 250px;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
}
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review-card {
  background: #ffffff;
  padding: 24px;
  border-radius: 12px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.review-quote {
  font-size: 14px;
  color: #334155;
  line-height: 1.6;
  margin-bottom: 16px;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid #f1f5f9;
  padding-top: 12px;
}
.review-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: #e0e7ff;
  color: var(--primary-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
}
.author-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--dark-navy);
}
.author-role {
  font-size: 12px;
  color: var(--text-muted);
}
.articles-list-box {
  background: #ffffff;
  padding: 24px;
  border-radius: 12px;
  border: 1px solid var(--border-light);
  margin-bottom: 24px;
}
.article-item-link {
  display: block;
  padding: 12px 16px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-main);
  font-size: 14px;
  transition: var(--transition);
  border-bottom: 1px solid #f8fafc;
}
.article-item-link:last-child {
  border-bottom: none;
}
.article-item-link:hover {
  background: #f0f7ff;
  color: var(--vivid-blue);
  transform: translateX(4px);
}
.footer-contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}
.contact-info-card {
  background: #ffffff;
  padding: 20px;
  border-radius: 12px;
  border: 1px solid var(--border-light);
  text-align: center;
}
.contact-info-card img {
  width: 120px;
  height: auto;
  margin: 10px auto;
  display: block;
  border-radius: 8px;
}
.contact-info-card h4 {
  font-size: 15px;
  color: var(--dark-navy);
  margin-bottom: 8px;
}
.contact-info-card p {
  font-size: 13px;
  color: var(--text-muted);
}
footer.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--border-light);
  padding: 40px 0 30px;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-links-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 20px;
}
.footer-links-row a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}
.footer-links-row a:hover {
  color: var(--vivid-blue);
}
.footer-copy {
  text-align: center;
  border-top: 1px solid #f1f5f9;
  padding-top: 20px;
}
.floating-widget {
  position: fixed;
  right: 20px;
  bottom: 30px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.float-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #ffffff;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-blue);
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  font-size: 18px;
}
.float-btn:hover {
  background: var(--vivid-blue);
  color: #ffffff;
  transform: translateY(-2px);
}
@media (max-width: 992px) {
  .hero-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .intro-grid {
    grid-template-columns: 1fr;
  }
  .cards-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  .cards-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .flow-steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .gallery-grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 768px) {
  .nav-wrapper {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    border-bottom: 1px solid var(--border-light);
    padding: 16px 20px;
    box-shadow: var(--shadow-md);
  }
  .nav-wrapper.active {
    display: block;
  }
  .nav-links {
    flex-direction: column;
    align-items: flex-start;
  }
  .nav-links li {
    width: 100%;
  }
  .nav-links li a {
    width: 100%;
    padding: 10px 0;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 28px;
  }
  .hero-desc {
    font-size: 15px;
  }
  .hero-stats-grid {
    grid-template-columns: 1fr;
  }
  .cards-grid-3, .cards-grid-4, .flow-steps-grid {
    grid-template-columns: 1fr;
  }
  .form-grid {
    grid-template-columns: 1fr;
  }
  .footer-contact-grid {
    grid-template-columns: 1fr;
  }
}