:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --secondary: #06b6d4;
  --accent: #f43f5e;
  --accent-warm: #f59e0b;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-sub: #64748b;
  --border-light: #e2e8f0;
  --border-focus: #c7d2fe;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --radius: 12px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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;
}

.site-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

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

.brand-box {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-box .ai-page-logo {
  height: 40px;
  width: auto;
  display: block;
}

.brand-text {
  font-size: 1.25rem;
  font-weight: 800;
  color: #1e1b4b;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}

.nav-links li a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-links li a:hover {
  color: var(--primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary) 0%, #6366f1 100%);
  color: #ffffff;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, #4f46e5 100%);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
}

.btn-accent {
  background: linear-gradient(135deg, #ec4899 0%, var(--accent) 100%);
  box-shadow: 0 4px 12px rgba(244, 63, 94, 0.25);
}

.btn-accent:hover {
  background: linear-gradient(135deg, #db2777 0%, #e11d48 100%);
  box-shadow: 0 6px 16px rgba(244, 63, 94, 0.35);
}

.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
}

.mobile-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-main);
  margin: 4px 0;
}

/* Sections General */
.section {
  padding: 64px 0;
}

.section-alt {
  background-color: #f1f5f9;
}

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 48px;
}

.section-tag {
  display: inline-block;
  padding: 4px 12px;
  background: #ede9fe;
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: 9999px;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 12px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* Hero Section (No Image) */
.hero-section {
  position: relative;
  padding: 80px 0 64px;
  background: radial-gradient(circle at 10% 20%, rgba(244, 63, 94, 0.08) 0%, rgba(79, 70, 229, 0.05) 50%, rgba(6, 182, 212, 0.05) 100%);
  border-bottom: 1px solid var(--border-light);
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #ffffff;
  border: 1px solid #fed7aa;
  padding: 6px 16px;
  border-radius: 9999px;
  font-size: 0.9rem;
  color: #c2410c;
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.hero-title {
  font-size: 2.6rem;
  font-weight: 900;
  line-height: 1.25;
  color: #09090b;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-actions .btn-official {
  background: linear-gradient(135deg, #ea580c 0%, #f43f5e 100%);
  color: #ffffff;
  padding: 14px 32px;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 8px;
  text-decoration: none;
  box-shadow: 0 8px 20px rgba(234, 88, 12, 0.3);
  transition: transform 0.2s ease;
}

.hero-actions .btn-official:hover {
  transform: translateY(-2px);
}

.hero-actions .btn-sub {
  background: #ffffff;
  color: var(--text-main);
  border: 1px solid var(--border-light);
  padding: 14px 28px;
  font-size: 1.05rem;
  font-weight: 600;
  border-radius: 8px;
  text-decoration: none;
  transition: background 0.2s ease;
}

.hero-actions .btn-sub:hover {
  background: #f8fafc;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.metric-card {
  background: #ffffff;
  padding: 20px;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.metric-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}

.metric-label {
  font-size: 0.9rem;
  color: var(--text-sub);
}

/* Platform Intro */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.platform-card {
  background: var(--bg-card);
  padding: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.platform-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.2rem;
  color: #fff;
  margin-bottom: 16px;
}

.platform-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.platform-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Service Grid */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.service-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.service-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 8px;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 16px;
}

.service-tag {
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
  background: #e0e7ff;
  color: #3730a3;
}

/* Model Chips */
.chips-container {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 24px;
}

.chip-item {
  background: #ffffff;
  border: 1px solid var(--border-light);
  padding: 8px 16px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: #334155;
  box-shadow: var(--shadow-sm);
}

/* Process Timeline */
.timeline-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}

.step-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
}

.step-badge {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.step-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.step-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Media Showcase */
.showcase-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  align-items: stretch;
}

.showcase-box {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.showcase-img-wrap {
  width: 100%;
  overflow: hidden;
  background: #f1f5f9;
}

.showcase-img-wrap img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.showcase-img-wrap img:hover {
  transform: scale(1.02);
}

.showcase-info {
  padding: 20px;
}

.showcase-info h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.showcase-info p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Review / Comparison Section */
.rating-hero-card {
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
  color: #ffffff;
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
  box-shadow: var(--shadow-md);
}

.rating-stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.rating-score {
  font-size: 3.5rem;
  font-weight: 900;
  color: #facc15;
  line-height: 1;
}

.rating-scale {
  font-size: 1.2rem;
  color: #cbd5e1;
}

.rating-desc h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.rating-desc p {
  font-size: 0.95rem;
  color: #e2e8f0;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
  background: #ffffff;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 600px;
}

.compare-table th,
.compare-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.95rem;
}

.compare-table th {
  background: #f8fafc;
  font-weight: 700;
  color: var(--text-main);
}

.compare-table tr:last-child td {
  border-bottom: none;
}

.compare-highlight {
  background: #eef2ff;
  font-weight: 600;
  color: var(--primary);
}

/* User Reviews */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.review-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-body {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-light);
  padding-top: 12px;
}

.reviewer-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #c7d2fe;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #3730a3;
  font-size: 0.85rem;
}

.reviewer-info h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
}

.reviewer-info span {
  font-size: 0.75rem;
  color: var(--text-sub);
}

/* FAQ Accordion */
.faq-grid {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 16px 20px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-question:hover {
  background: #f8fafc;
}

.faq-answer {
  display: none;
  padding: 0 20px 16px;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  border-top: 1px solid #f1f5f9;
}

.faq-item.active .faq-answer {
  display: block;
}

/* Form & Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.contact-form-box {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-main);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-light);
  border-radius: 6px;
  font-size: 0.95rem;
  color: var(--text-main);
  background: #ffffff;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.contact-info-box {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.contact-info-box h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.qr-section {
  display: flex;
  align-items: center;
  gap: 20px;
  margin: 20px 0;
  padding: 16px;
  background: #f8fafc;
  border-radius: 8px;
}

.qr-section img {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border-radius: 4px;
}

.channel-list {
  list-style: none;
  margin-top: 16px;
}

.channel-list li {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

/* Articles Section */
.articles-box {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 24px;
}

.articles-box ul {
  list-style: disc;
  padding-left: 20px;
}

.articles-box li {
  margin-bottom: 8px;
  font-size: 0.92rem;
}

.articles-box li a {
  color: var(--primary);
  text-decoration: none;
}

.articles-box li a:hover {
  text-decoration: underline;
}

/* Agency Card */
.agency-card {
  background: linear-gradient(135deg, #4338ca 0%, #3b82f6 100%);
  border-radius: var(--radius);
  padding: 40px;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
}

.agency-text h3 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.agency-text p {
  font-size: 1rem;
  color: #e0e7ff;
}

/* Floating Widget */
.floating-kefu {
  position: fixed;
  right: 20px;
  bottom: 80px;
  z-index: 99;
  background: #ffffff;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-lg);
  border-radius: 12px;
  padding: 12px;
  text-align: center;
  width: 120px;
}

.floating-kefu img {
  width: 90px;
  height: 90px;
  display: block;
  margin: 0 auto 6px;
}

.floating-kefu span {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-main);
  display: block;
}

/* Footer */
.site-footer {
  background: #0f172a;
  color: #cbd5e1;
  padding: 48px 0 24px;
  border-top: 1px solid #1e293b;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 36px;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-col p {
  font-size: 0.88rem;
  color: #94a3b8;
  line-height: 1.6;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #ffffff;
}

.friendly-links a {
  display: inline-block;
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.85rem;
  margin-right: 12px;
  margin-bottom: 8px;
}

.friendly-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: #64748b;
}

/* Responsive */
@media (max-width: 992px) {
  .metrics-grid,
  .platform-grid,
  .service-grid,
  .timeline-grid,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .showcase-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 1.8rem;
  }
  .mobile-toggle {
    display: block;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    flex-direction: column;
    padding: 16px 20px;
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--border-light);
  }
  .nav-links.active {
    display: flex;
  }
  .nav-links li {
    width: 100%;
  }
  .nav-links li a {
    display: block;
    padding: 10px 0;
  }
  .metrics-grid,
  .platform-grid,
  .service-grid,
  .timeline-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .rating-hero-card,
  .agency-card {
    flex-direction: column;
    text-align: center;
    gap: 16px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  .floating-kefu {
    display: none;
  }
}