:root {
  --primary: #4338ca;
  --primary-light: #6366f1;
  --secondary: #0ea5e9;
  --accent-pink: #ec4899;
  --accent-amber: #f59e0b;
  --accent-emerald: #10b981;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-sub: #64748b;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --rainbow-gradient: linear-gradient(135deg, #4f46e5 0%, #06b6d4 30%, #10b981 60%, #f59e0b 85%, #ec4899 100%);
  --rainbow-soft: linear-gradient(135deg, rgba(79,70,229,0.06) 0%, rgba(6,182,212,0.06) 30%, rgba(16,185,129,0.06) 60%, rgba(245,158,11,0.06) 85%, rgba(236,72,153,0.06) 100%);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background-color: var(--bg-page);
  line-height: 1.6;
}
body {
  width: 100%;
  overflow-x: hidden;
  background: var(--bg-page);
}
.container {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}
header.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo-box {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.ai-page-logo {
  height: 42px;
  width: auto;
  display: block;
}
.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.5px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}
.nav-links a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}
.nav-links a:hover {
  color: var(--primary);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s ease;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--rainbow-gradient);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}
.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
}
.btn-outline {
  background: #ffffff;
  border-color: #cbd5e1;
  color: var(--text-main);
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--text-main);
  cursor: pointer;
}
.hero-section {
  position: relative;
  padding: 70px 0 60px;
  background: var(--rainbow-soft);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}
.rainbow-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 9999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}
.rainbow-pill span.dot {
  width: 8px;
  height: 8px;
  background: var(--accent-emerald);
  border-radius: 50%;
}
.hero-title {
  font-size: 40px;
  line-height: 1.25;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.hero-desc {
  max-width: 820px;
  margin: 0 auto 36px;
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.7;
}
.hero-cta-group {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero-cta-group .btn {
  padding: 13px 30px;
  font-size: 15px;
}
.metrics-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 20px;
}
.metric-card {
  background: #ffffff;
  padding: 20px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  text-align: center;
}
.metric-number {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}
.metric-label {
  font-size: 13px;
  color: var(--text-sub);
  font-weight: 500;
}
.section {
  padding: 80px 0;
}
.section-colored {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}
.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--primary-light);
  margin-bottom: 8px;
}
.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
}
.section-subtitle {
  font-size: 16px;
  color: var(--text-muted);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.about-content h3 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 18px;
  color: var(--text-main);
}
.about-content p {
  color: var(--text-muted);
  font-size: 15px;
  margin-bottom: 16px;
}
.feature-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 24px;
}
.feature-list li {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}
.feature-list li::before {
  content: "✓";
  color: var(--accent-emerald);
  font-weight: bold;
}
.media-img-wrap {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
}
.media-img-wrap img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #cbd5e1;
}
.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-weight: bold;
  font-size: 20px;
}
.icon-indigo { background: #e0e7ff; color: #4338ca; }
.icon-cyan { background: #cffafe; color: #0891b2; }
.icon-emerald { background: #d1fae5; color: #059669; }
.icon-amber { background: #fef3c7; color: #d97706; }
.icon-pink { background: #fce7f3; color: #db2777; }
.icon-purple { background: #f3e8ff; color: #7e22ce; }
.card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}
.card-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  flex-grow: 1;
}
.steps-wrap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}
.step-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  position: relative;
}
.step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--rainbow-gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin-bottom: 16px;
}
.step-item h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}
.step-item p {
  font-size: 13px;
  color: var(--text-muted);
}
.review-score-banner {
  background: var(--rainbow-soft);
  border: 1px solid #c7d2fe;
  border-radius: 16px;
  padding: 30px;
  margin-bottom: 36px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}
.score-badge-left {
  display: flex;
  align-items: center;
  gap: 20px;
}
.score-circle {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 24px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(67, 56, 202, 0.3);
}
.score-text h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
}
.score-text p {
  font-size: 14px;
  color: var(--text-muted);
}
.stars {
  color: #f59e0b;
  font-size: 18px;
}
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  background: #ffffff;
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 680px;
}
.compare-table th, .compare-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: 14px;
}
.compare-table th {
  background: #f1f5f9;
  font-weight: 700;
  color: var(--text-main);
}
.compare-table tr:last-child td {
  border-bottom: none;
}
.compare-table .highlight {
  background: rgba(99, 102, 241, 0.05);
  font-weight: 600;
  color: var(--primary);
}
.models-tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}
.model-badge {
  padding: 6px 14px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.2s ease;
}
.model-badge:hover {
  border-color: var(--primary-light);
  color: var(--primary);
  background: #ffffff;
}
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 900px;
  margin: 0 auto;
}
.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.faq-header {
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}
.faq-header::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--text-sub);
  transition: transform 0.2s ease;
}
.faq-item.active {
  border-color: var(--primary-light);
}
.faq-item.active .faq-header::after {
  transform: rotate(45deg);
}
.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 24px;
  background: #f8fafc;
}
.faq-item.active .faq-body {
  max-height: 1000px;
  padding: 16px 24px 20px;
  transition: max-height 0.3s ease-in-out;
}
.faq-body p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}
.review-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--rainbow-gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
}
.user-info h5 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
}
.user-info span {
  font-size: 12px;
  color: var(--text-sub);
}
.review-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}
.form-wrap {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 40px;
  box-shadow: var(--shadow-md);
  max-width: 800px;
  margin: 0 auto;
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.form-group {
  margin-bottom: 20px;
}
.form-group.full {
  grid-column: 1 / -1;
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}
.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-main);
  background: #f8fafc;
  outline: none;
  transition: all 0.2s ease;
}
.form-control:focus {
  border-color: var(--primary);
  background: #ffffff;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}
textarea.form-control {
  resize: vertical;
  min-height: 100px;
}
.article-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.article-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text-main);
  transition: all 0.2s ease;
}
.article-item:hover {
  border-color: var(--primary);
  transform: translateX(4px);
}
.article-item span.title {
  font-size: 15px;
  font-weight: 600;
}
.article-item span.date {
  font-size: 13px;
  color: var(--text-sub);
}
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}
.contact-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--text-muted);
}
.contact-item strong {
  color: var(--text-main);
  min-width: 80px;
}
.qr-code-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 12px;
  padding: 20px;
  background: #f8fafc;
  border-radius: 8px;
}
.qr-code-box img {
  width: 140px;
  height: 140px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}
.friend-links-box {
  padding: 24px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  margin-top: 40px;
}
.friend-links-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}
.friend-links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.friend-links-list a {
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
}
.friend-links-list a:hover {
  color: var(--primary);
  text-decoration: underline;
}
footer.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 40px 0 30px;
  color: var(--text-muted);
}
.footer-bottom {
  text-align: center;
  font-size: 13px;
  color: var(--text-sub);
  margin-top: 24px;
}
.floating-widget {
  position: fixed;
  right: 20px;
  bottom: 30px;
  z-index: 99;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.float-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #ffffff;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  text-decoration: none;
  color: var(--text-main);
  font-size: 18px;
  transition: all 0.2s ease;
}
.float-btn:hover {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}
@media (max-width: 992px) {
  .about-grid, .contact-container, .form-grid {
    grid-template-columns: 1fr;
  }
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }
  .grid-4, .steps-wrap, .metrics-strip {
    grid-template-columns: 1fr 1fr;
  }
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    padding: 16px 0;
  }
  .nav-links.active {
    display: flex;
  }
  .mobile-menu-btn {
    display: block;
  }
}
@media (max-width: 640px) {
  .grid-3, .grid-4, .steps-wrap, .metrics-strip {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 28px;
  }
  .section {
    padding: 50px 0;
  }
  .section-title {
    font-size: 24px;
  }
  .review-score-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}