:root {
  --rainbow-grad: linear-gradient(135deg, #ef4444 0%, #f97316 16%, #eab308 32%, #22c55e 48%, #06b6d4 64%, #3b82f6 80%, #8b5cf6 100%);
  --rainbow-soft: linear-gradient(135deg, rgba(239, 68, 68, 0.08) 0%, rgba(249, 115, 22, 0.08) 16%, rgba(234, 179, 8, 0.08) 32%, rgba(34, 197, 94, 0.08) 48%, rgba(6, 182, 212, 0.08) 64%, rgba(59, 130, 246, 0.08) 80%, rgba(139, 92, 246, 0.08) 100%);
  --rainbow-border: linear-gradient(90deg, #ef4444, #f97316, #eab308, #22c55e, #06b6d4, #3b82f6, #8b5cf6);
  --primary-color: #3b82f6;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --bg-page: #f8fafc;
  --card-bg: #ffffff;
  --border-color: #e2e8f0;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.08);
  --radius-md: 12px;
  --radius-lg: 16px;
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}
.site-wrapper {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.container {
  width: 100%;
  max-width: 1200px;
  padding-left: 20px;
  padding-right: 20px;
  margin: 0 auto;
}
a {
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.brand-box {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-box .ai-page-logo {
  height: 38px;
  width: auto;
}
.brand-name {
  font-size: 20px;
  font-weight: 800;
  background: var(--rainbow-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-menu {
  display: flex;
  align-items: center;
}
.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 0;
}
.nav-links li a {
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-main);
  border-radius: 6px;
  display: block;
}
.nav-links li a:hover {
  color: var(--primary-color);
  background: var(--rainbow-soft);
}
.nav-cta-btn {
  background: var(--rainbow-grad);
  color: #ffffff !important;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 20px;
  box-shadow: 0 4px 10px rgba(59, 130, 246, 0.3);
  margin-left: 15px;
}
.nav-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(59, 130, 246, 0.4);
}
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-main);
}

/* Hero Section */
.hero-section {
  width: 100%;
  background: var(--rainbow-soft);
  position: relative;
  padding: 80px 0 60px;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}
.hero-rainbow-bar {
  height: 4px;
  width: 100%;
  background: var(--rainbow-border);
  position: absolute;
  top: 0;
  left: 0;
}
.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  background: #ffffff;
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 30px;
  font-size: 14px;
  font-weight: 600;
  color: #3b82f6;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}
.hero-title {
  font-size: 42px;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-main);
  margin-bottom: 20px;
}
.hero-title span {
  background: var(--rainbow-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto 36px;
}
.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.btn-primary {
  background: var(--rainbow-grad);
  color: #ffffff;
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 6px 18px rgba(239, 68, 68, 0.25);
  border: none;
  cursor: pointer;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(239, 68, 68, 0.35);
}
.btn-secondary {
  background: #ffffff;
  color: var(--text-main);
  padding: 14px 28px;
  border-radius: 30px;
  font-size: 16px;
  font-weight: 600;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}
.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 20px;
}
.stat-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease;
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--rainbow-border);
}
.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.stat-number {
  font-size: 32px;
  font-weight: 800;
  color: #1e293b;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 14px;
  color: var(--text-muted);
}

/* Sections Global */
.page-section {
  width: 100%;
  padding: 70px 0;
  border-bottom: 1px solid var(--border-color);
  background: #ffffff;
}
.page-section.alt-bg {
  background: #f8fafc;
}
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}
.section-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--rainbow-soft);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 12px;
}
.section-title {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 14px;
}
.section-subtitle {
  font-size: 16px;
  color: var(--text-muted);
}

/* Card Grids */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.feature-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  position: relative;
}
.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(59, 130, 246, 0.3);
}
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--rainbow-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 20px;
  border: 1px solid rgba(59, 130, 246, 0.15);
}
.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}
.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  flex-grow: 1;
}

/* Model Badges Grid */
.models-wrapper {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-sm);
}
.model-tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}
.model-tag-pill {
  padding: 8px 18px;
  background: #f1f5f9;
  border: 1px solid #e2e8f0;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  color: #334155;
  transition: all 0.2s ease;
}
.model-tag-pill:hover {
  background: var(--rainbow-grad);
  color: #ffffff;
  border-color: transparent;
  transform: scale(1.05);
}

/* Media Showcase Section */
.media-showcase-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  align-items: stretch;
}
.media-box {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
}
.media-box-inner {
  padding: 20px;
}
.media-box-inner h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}
.media-box-inner p {
  font-size: 14px;
  color: var(--text-muted);
}
.media-img-wrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #e2e8f0;
  overflow: hidden;
}
.media-img-wrap.square-ratio {
  aspect-ratio: 1 / 1;
}
.media-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Workflow Steps */
.step-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}
.step-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  text-align: center;
  position: relative;
}
.step-num {
  width: 40px;
  height: 40px;
  background: var(--rainbow-grad);
  color: #ffffff;
  font-weight: 800;
  font-size: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.step-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}
.step-card p {
  font-size: 13px;
  color: var(--text-muted);
}

/* Comparison Table */
.table-container {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
}
.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 600px;
}
.custom-table th, .custom-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: 14px;
}
.custom-table th {
  background: #f8fafc;
  font-weight: 700;
  color: var(--text-main);
}
.custom-table tr:hover {
  background: #f1f5f9;
}
.highlight-cell {
  color: #2563eb;
  font-weight: 700;
}
.badge-score {
  display: inline-block;
  background: #fef08a;
  color: #854d0e;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 14px;
}

/* Review Cards */
.review-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}
.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--rainbow-grad);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
}
.review-name {
  font-size: 15px;
  font-weight: 700;
}
.review-role {
  font-size: 12px;
  color: var(--text-muted);
}
.review-stars {
  color: #f59e0b;
  margin-bottom: 10px;
}
.review-body {
  font-size: 14px;
  color: #475569;
  line-height: 1.6;
}

/* FAQ Accordion */
.faq-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.faq-question {
  width: 100%;
  padding: 18px 24px;
  text-align: left;
  background: none;
  border: none;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}
.faq-question:hover {
  background: var(--rainbow-soft);
}
.faq-icon {
  font-size: 18px;
  color: var(--primary-color);
  transition: transform 0.3s ease;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  background: #f8fafc;
  padding: 0 24px;
  font-size: 14px;
  color: #475569;
  line-height: 1.6;
}
.faq-item.active .faq-answer {
  max-height: 200px;
  padding: 16px 24px 20px;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

/* Form Section */
.form-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
  max-width: 760px;
  margin: 0 auto;
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-main);
}
.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  background: #ffffff;
  color: var(--text-main);
}
.form-control:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}
textarea.form-control {
  resize: vertical;
  min-height: 100px;
}
.btn-submit {
  width: 100%;
  padding: 14px;
  background: var(--rainbow-grad);
  border: none;
  border-radius: 8px;
  color: #ffffff;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}
.btn-submit:hover {
  opacity: 0.95;
  transform: translateY(-1px);
}

/* Articles Section */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.article-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}
.article-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
}
.article-card h3 a:hover {
  color: var(--primary-color);
}
.article-card p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  flex-grow: 1;
}
.article-meta {
  font-size: 12px;
  color: #94a3b8;
  display: flex;
  justify-content: space-between;
}

/* Footer Section */
.site-footer {
  width: 100%;
  background: #0f172a;
  color: #e2e8f0;
  padding: 60px 0 30px;
  margin-top: auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-col h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 20px;
  color: #ffffff;
}
.footer-col ul {
  list-style: none;
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  color: #94a3b8;
  font-size: 14px;
}
.footer-col ul li a:hover {
  color: #ffffff;
}
.footer-contact-item {
  font-size: 14px;
  color: #94a3b8;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.qr-container {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 14px;
}
.qr-box {
  width: 100px;
  background: #ffffff;
  padding: 6px;
  border-radius: 8px;
}
.friend-links {
  border-top: 1px solid #1e293b;
  padding-top: 24px;
  margin-bottom: 24px;
}
.friend-links-title {
  font-size: 14px;
  color: #64748b;
  margin-bottom: 12px;
}
.friend-links-list {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.friend-links-list a {
  font-size: 13px;
  color: #94a3b8;
}
.friend-links-list a:hover {
  color: #38bdf8;
}
.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: #64748b;
}

/* Floating Elements */
.floating-kefu {
  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-color);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-main);
  transition: all 0.3s ease;
  font-size: 18px;
}
.float-btn.active-kefu {
  background: var(--rainbow-grad);
  color: #ffffff;
  border: none;
}
.float-btn:hover {
  transform: scale(1.1);
}

/* Responsive */
@media (max-width: 992px) {
  .hero-title { font-size: 32px; }
  .grid-4, .hero-stats-grid, .step-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .article-grid { grid-template-columns: repeat(2, 1fr); }
  .media-showcase-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .nav-menu {
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background: #ffffff;
    flex-direction: column;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    display: none;
  }
  .nav-menu.show { display: flex; }
  .nav-links { flex-direction: column; width: 100%; gap: 0; }
  .nav-links li { width: 100%; text-align: center; }
  .nav-cta-btn { margin: 15px 0 0; width: 100%; text-align: center; }
  .hero-title { font-size: 26px; }
  .grid-2, .grid-3, .grid-4, .hero-stats-grid, .step-grid, .article-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}