:root {
      --bg-base: #fdfaf7;
      --bg-soft: #f4f6fc;
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --candy-pink: #f43f5e;
      --candy-purple: #8b5cf6;
      --candy-amber: #f59e0b;
      --candy-cyan: #06b6d4;
      --candy-emerald: #10b981;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --card-bg: #ffffff;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 10px 25px -3px rgba(79, 70, 229, 0.08);
      --shadow-lg: 0 20px 30px -10px rgba(79, 70, 229, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --container-max: 1200px;
    }

    * {
      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: linear-gradient(180deg, #fdfaf7 0%, #f4f7fe 100%);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      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 rgba(226, 232, 240, 0.8);
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }

    .nav-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: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-text {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      text-decoration: none;
      color: var(--text-main);
      font-size: 15px;
      font-weight: 500;
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: #eef2ff;
    }

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

    .btn-candy {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: linear-gradient(135deg, var(--candy-pink), var(--candy-purple));
      color: #ffffff;
      padding: 10px 22px;
      border-radius: var(--radius-full);
      font-size: 15px;
      font-weight: 600;
      text-decoration: none;
      box-shadow: 0 4px 14px rgba(244, 63, 94, 0.3);
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
    }

    .btn-candy:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(244, 63, 94, 0.45);
      color: #ffffff;
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: #ffffff;
      color: var(--primary);
      padding: 9px 20px;
      border-radius: var(--radius-full);
      font-size: 15px;
      font-weight: 600;
      text-decoration: none;
      border: 1.5px solid #c7d2fe;
      transition: all 0.25s ease;
    }

    .btn-outline:hover {
      background: #eef2ff;
      border-color: var(--primary);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* Hero Section (首屏绝对不放图片) */
    .hero-section {
      padding: 64px 0 40px;
      position: relative;
    }

    .hero-container {
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #fdf2f8;
      border: 1px solid #fbcfe8;
      border-radius: var(--radius-full);
      color: var(--candy-pink);
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .hero-badge span.pulse-dot {
      width: 8px;
      height: 8px;
      background: var(--candy-pink);
      border-radius: 50%;
      box-shadow: 0 0 0 4px rgba(244, 63, 94, 0.2);
    }

    h1.hero-title {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 900;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-desc {
      font-size: 18px;
      line-height: 1.7;
      color: var(--text-muted);
      max-width: 840px;
      margin: 0 auto 32px;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .btn-hero-primary {
      font-size: 17px;
      padding: 14px 36px;
      background: linear-gradient(135deg, #4f46e5, #7c3aed);
      color: #ffffff;
      border-radius: var(--radius-full);
      text-decoration: none;
      font-weight: 700;
      box-shadow: 0 10px 25px rgba(79, 70, 229, 0.35);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-hero-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 30px rgba(79, 70, 229, 0.45);
    }

    .btn-hero-secondary {
      font-size: 17px;
      padding: 14px 32px;
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-full);
      text-decoration: none;
      font-weight: 600;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }

    .btn-hero-secondary:hover {
      background: #f8fafc;
      border-color: #cbd5e1;
      transform: translateY(-2px);
    }

    .stats-banner {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-md);
      max-width: 1040px;
      margin: 0 auto;
    }

    .stat-item {
      text-align: center;
      padding: 8px 12px;
      border-right: 1px dashed var(--border-color);
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-value {
      font-size: 30px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Section Commom Styles */
    section {
      padding: 72px 0;
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      border-radius: var(--radius-full);
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
      background: #e0e7ff;
      color: var(--primary);
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Multi-Model Grid */
    .models-chip-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      padding: 8px 16px;
      border-radius: var(--radius-full);
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      box-shadow: 0 2px 4px rgba(0,0,0,0.02);
      transition: all 0.2s;
    }

    .model-chip:hover {
      border-color: var(--candy-purple);
      color: var(--candy-purple);
      transform: translateY(-2px);
    }

    /* Services Cards (缤纷糖果色系) */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      position: relative;
      overflow: hidden;
    }

    .service-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: linear-gradient(90deg, var(--candy-pink), var(--candy-amber));
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }

    .service-card:hover::before {
      opacity: 1;
    }

    .service-icon-box {
      width: 52px;
      height: 52px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-bottom: 20px;
      background: #eef2ff;
      color: var(--primary);
    }

    .service-card:nth-child(2) .service-icon-box { background: #fdf2f8; color: var(--candy-pink); }
    .service-card:nth-child(3) .service-icon-box { background: #f5f3ff; color: var(--candy-purple); }
    .service-card:nth-child(4) .service-icon-box { background: #f0fdf4; color: var(--candy-emerald); }
    .service-card:nth-child(5) .service-icon-box { background: #ecfeff; color: var(--candy-cyan); }
    .service-card:nth-child(6) .service-icon-box { background: #fffbeb; color: var(--candy-amber); }

    .service-card h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      color: #0f172a;
    }

    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
      flex-grow: 1;
    }

    .service-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .service-tags span {
      font-size: 12px;
      padding: 3px 8px;
      background: #f1f5f9;
      color: #475569;
      border-radius: 4px;
    }

    /* About Section & Platform Presentation */
    .about-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .about-features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 32px;
    }

    .feat-card {
      background: #f8fafc;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid #edf2f7;
    }

    .feat-card h4 {
      font-size: 16px;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 8px;
    }

    .feat-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Workflow Steps */
    .workflow-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;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--candy-cyan), var(--primary));
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-size: 18px;
    }

    .step-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Comparison Table */
    .table-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow-x: auto;
    }

    table.compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 15px;
    }

    table.compare-table th,
    table.compare-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }

    table.compare-table th {
      background: #f8fafc;
      color: #0f172a;
      font-weight: 700;
    }

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

    .badge-score {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      background: #ecfdf5;
      color: #059669;
      padding: 4px 10px;
      border-radius: var(--radius-full);
      font-weight: 700;
      font-size: 14px;
    }

    .star-rating {
      color: #f59e0b;
      letter-spacing: 2px;
    }

    /* Media Gallery */
    .media-gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 32px;
    }

    .media-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .media-card img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .media-caption {
      padding: 16px 20px;
    }

    .media-caption h4 {
      font-size: 16px;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 4px;
    }

    .media-caption p {
      font-size: 13px;
      color: var(--text-muted);
    }

    .square-media-wrapper {
      max-width: 580px;
      margin: 24px auto 0;
    }

    /* Promotional Banners */
    .promo-banner-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-top: 24px;
    }

    .promo-banner-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .promo-banner-item img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* Reviews Grid */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .review-body {
      font-size: 14px;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 16px;
    }

    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }

    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--candy-pink), var(--candy-purple));
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
    }

    .reviewer-name {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
    }

    .reviewer-title {
      font-size: 13px;
      color: var(--text-muted);
    }

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .faq-item.active {
      border-color: var(--primary);
    }

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: none;
      border: none;
      font-size: 16px;
      font-weight: 700;
      color: #0f172a;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-toggle-icon {
      font-size: 18px;
      transition: transform 0.3s ease;
    }

    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #f8fafc;
      color: #475569;
      font-size: 14px;
      line-height: 1.7;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px 20px;
      border-top: 1px solid var(--border-color);
    }

    /* Match Form & Contact Section */
    .form-section-wrapper {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 36px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: #334155;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid #cbd5e1;
      font-size: 14px;
      color: var(--text-main);
      background: #fcfdfd;
      transition: border-color 0.2s ease;
      font-family: inherit;
    }

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

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .contact-info-card {
      background: #f8fafc;
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid #edf2f7;
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
    }

    .contact-icon {
      font-size: 18px;
      color: var(--primary);
      margin-top: 2px;
    }

    .contact-text strong {
      display: block;
      font-size: 14px;
      color: #0f172a;
    }

    .contact-text span {
      font-size: 13px;
      color: var(--text-muted);
    }

    .qr-container {
      text-align: center;
      margin-top: 10px;
      padding: 16px;
      background: #ffffff;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }

    .qr-container img {
      max-width: 130px;
      height: auto;
      border-radius: 4px;
    }

    .qr-container p {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 6px;
    }

    /* Articles Section */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-item-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 20px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .article-item-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .article-item-card a {
      text-decoration: none;
      color: #0f172a;
      font-weight: 700;
      font-size: 15px;
      display: block;
      margin-bottom: 8px;
      transition: color 0.2s;
    }

    .article-item-card a:hover {
      color: var(--primary);
    }

    .article-item-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Site Footer */
    footer.site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 56px 0 24px;
      color: #334155;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 40px;
    }

    .footer-brand p {
      font-size: 14px;
      color: var(--text-muted);
      margin: 14px 0 20px;
      line-height: 1.6;
      max-width: 320px;
    }

    .footer-col h4 {
      font-size: 16px;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links li a {
      text-decoration: none;
      color: var(--text-muted);
      font-size: 14px;
      transition: color 0.2s;
    }

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

    .friendly-links-bar {
      border-top: 1px dashed var(--border-color);
      padding-top: 24px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 13px;
      color: var(--text-muted);
    }

    .friendly-links-bar a {
      color: #475569;
      text-decoration: none;
      transition: color 0.2s;
    }

    .friendly-links-bar a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 13px;
      color: #64748b;
    }

    /* Floating Widget */
    .floating-support {
      position: fixed;
      right: 24px;
      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: 0 4px 12px rgba(0,0,0,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      color: var(--text-main);
      font-size: 18px;
      cursor: pointer;
      transition: all 0.25s ease;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.05);
    }

    .float-btn.primary {
      background: linear-gradient(135deg, var(--candy-pink), var(--candy-purple));
      color: #ffffff;
      border: none;
    }

    /* Responsive */
    @media (max-width: 992px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .about-features-grid { grid-template-columns: repeat(2, 1fr); }
      .workflow-grid { grid-template-columns: repeat(2, 1fr); }
      .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .articles-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .form-section-wrapper { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .nav-actions .btn-outline { display: none; }
      .mobile-menu-btn { display: block; }
      h1.hero-title { font-size: 28px; }
      .hero-desc { font-size: 15px; }
      .stats-banner { grid-template-columns: repeat(2, 1fr); }
      .stat-item { border-right: none; }
      .services-grid { grid-template-columns: 1fr; }
      .about-features-grid { grid-template-columns: 1fr; }
      .workflow-grid { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .articles-grid { grid-template-columns: 1fr; }
      .media-gallery-grid { grid-template-columns: 1fr; }
      .promo-banner-list { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
    }