:root {
      --primary: #0052ff;
      --primary-hover: #0041cc;
      --secondary: #00c6ff;
      --accent: #ff6b00;
      --text-main: #1d2129;
      --text-sub: #4e5969;
      --text-muted: #86909c;
      --bg-base: #f7f9fc;
      --bg-card: #ffffff;
      --bg-alt: #f0f4fa;
      --border-color: #e5e6eb;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(0, 82, 255, 0.05);
      --shadow-md: 0 8px 24px rgba(0, 82, 255, 0.08);
      --shadow-lg: 0 16px 40px rgba(0, 82, 255, 0.12);
      --transition: all 0.28s ease;
    }

    * {
      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", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .section {
      padding: 88px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-alt);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 56px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1.5px;
      background: rgba(0, 82, 255, 0.08);
      padding: 6px 14px;
      border-radius: 50px;
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* Header & Navigation */
    .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-color);
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
    }

    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

    .nav-brand .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

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

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-sub);
      padding: 10px 14px;
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background-color: rgba(0, 82, 255, 0.05);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      padding: 12px 26px;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      font-size: 0.95rem;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #1677ff 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(0, 82, 255, 0.28);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, #0958d9 100%);
      box-shadow: 0 6px 18px rgba(0, 82, 255, 0.38);
      transform: translateY(-2px);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      border-color: var(--border-color);
      color: var(--text-main);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: rgba(0, 82, 255, 0.04);
      transform: translateY(-2px);
    }

    .btn-accent {
      background: linear-gradient(135deg, #ff7a00 0%, #ff5200 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(255, 107, 0, 0.25);
    }

    .btn-accent:hover {
      background: #e65c00;
      transform: translateY(-2px);
      color: #ffffff;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--text-main);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* Hero Section (No Images as per requirement) */
    .hero-section {
      padding: 96px 0 84px;
      background: radial-gradient(100% 100% at 50% 0%, #ebf2ff 0%, #f7f9fc 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid rgba(0, 82, 255, 0.2);
      border-radius: 50px;
      padding: 6px 18px;
      font-size: 0.9rem;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-badge::before {
      content: "";
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #52c41a;
      box-shadow: 0 0 0 3px rgba(82, 196, 26, 0.2);
    }

    .hero-title {
      font-size: 3.1rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary);
      background: linear-gradient(135deg, #0052ff 0%, #00c6ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-cta {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 56px;
      flex-wrap: wrap;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1040px;
      margin: 0 auto;
    }

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(0, 82, 255, 0.3);
    }

    .stat-num {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-sub);
      font-weight: 500;
    }

    /* Model Logos Ticker */
    .model-ticker-section {
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
      padding: 28px 0;
    }

    .ticker-title {
      text-align: center;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-muted);
      letter-spacing: 1px;
      margin-bottom: 16px;
      text-transform: uppercase;
    }

    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-tag {
      background: var(--bg-base);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: var(--radius-sm);
      font-size: 0.82rem;
      font-weight: 600;
      color: var(--text-sub);
      transition: var(--transition);
    }

    .model-tag:hover {
      color: var(--primary);
      border-color: var(--primary);
      background: #ffffff;
    }

    /* Grid Layouts */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 40px;
      align-items: center;
    }

    /* Feature & Service Cards */
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: rgba(0, 82, 255, 0.3);
    }

    .card-icon {
      width: 52px;
      height: 52px;
      border-radius: var(--radius-sm);
      background: rgba(0, 82, 255, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      flex-shrink: 0;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .card-text {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.65;
      flex-grow: 1;
      margin-bottom: 16px;
    }

    .card-list {
      list-style: none;
      margin-bottom: 18px;
    }

    .card-list li {
      position: relative;
      padding-left: 18px;
      font-size: 0.88rem;
      color: var(--text-sub);
      margin-bottom: 6px;
    }

    .card-list li::before {
      content: "•";
      position: absolute;
      left: 0;
      color: var(--primary);
      font-size: 1.2rem;
      line-height: 1;
    }

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

    .step-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-index {
      position: absolute;
      top: 18px;
      right: 18px;
      font-size: 2.2rem;
      font-weight: 900;
      color: rgba(0, 82, 255, 0.08);
      line-height: 1;
    }

    .step-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .step-desc {
      font-size: 0.9rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

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

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .comparison-table th,
    .comparison-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .comparison-table th {
      background: var(--bg-alt);
      font-weight: 700;
      color: var(--text-main);
    }

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

    .comparison-table .highlight-col {
      background: rgba(0, 82, 255, 0.03);
      font-weight: 600;
      color: var(--primary);
    }

    .badge-rating {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #fff7e6;
      color: #d46b08;
      border: 1px solid #ffd591;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      font-weight: 700;
    }

    /* Image Showcases (outside Hero) */
    .media-card {
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .media-card-img {
      position: relative;
      aspect-ratio: 16/9;
      background: #e5e6eb;
      overflow: hidden;
    }

    .media-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }

    .media-card:hover .media-card-img img {
      transform: scale(1.03);
    }

    .media-card-body {
      padding: 20px;
    }

    .media-card-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .media-card-desc {
      font-size: 0.88rem;
      color: var(--text-sub);
    }

    /* Testimonials */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }

    .user-avatar-placeholder {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, #69b1ff 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .user-name {
      font-weight: 700;
      color: var(--text-main);
      font-size: 1rem;
    }

    .user-role {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .testimonial-quote {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.7;
      font-style: italic;
    }

    /* FAQ Accordion */
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

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

    .faq-item:hover {
      border-color: rgba(0, 82, 255, 0.3);
    }

    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.25s ease;
      font-weight: 400;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, padding 0.3s ease;
      background: var(--bg-alt);
      color: var(--text-sub);
      font-size: 0.93rem;
      line-height: 1.7;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      padding: 18px 24px;
      max-height: 300px;
    }

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

    /* Form Section */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 44px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 22px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 13px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #ffffff;
      color: var(--text-main);
      transition: var(--transition);
      outline: none;
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 82, 255, 0.12);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* Article List & External Links */
    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .article-item {
      display: flex;
      align-items: baseline;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px dashed var(--border-color);
      font-size: 0.92rem;
    }

    .article-item:last-child {
      border-bottom: none;
    }

    .article-item a {
      color: var(--text-main);
      font-weight: 500;
    }

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

    /* Footer Styles */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 72px 0 32px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 48px;
    }

    .footer-col-title {
      font-size: 1rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 20px;
    }

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

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      color: #94a3b8;
      font-size: 0.9rem;
    }

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

    .footer-contact-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.9rem;
      margin-bottom: 12px;
      color: #cbd5e1;
    }

    .footer-qr {
      display: flex;
      align-items: center;
      gap: 16px;
      background: rgba(255, 255, 255, 0.05);
      padding: 14px;
      border-radius: var(--radius-sm);
      margin-top: 16px;
    }

    .footer-qr img {
      width: 74px;
      height: 74px;
      object-fit: cover;
      border-radius: 4px;
      background: #ffffff;
    }

    .footer-qr-text {
      font-size: 0.82rem;
      color: #cbd5e1;
      line-height: 1.5;
    }

    .friend-links-area {
      border-top: 1px solid #1e293b;
      padding: 24px 0;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 0.85rem;
    }

    .friend-links-area a {
      color: #94a3b8;
    }

    .friend-links-area a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* Float Service Contact */
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .floating-btn {
      width: 52px;
      height: 52px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 50%;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      font-size: 1.3rem;
      transition: var(--transition);
      position: relative;
    }

    .floating-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-3px);
    }

    .floating-qr-popup {
      position: absolute;
      right: 64px;
      bottom: 0;
      background: #ffffff;
      padding: 14px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 160px;
      text-align: center;
    }

    .floating-qr-popup img {
      width: 130px;
      height: 130px;
      display: block;
      margin: 0 auto 8px;
    }

    .floating-qr-popup span {
      font-size: 0.8rem;
      color: var(--text-main);
      font-weight: 600;
    }

    .floating-btn:hover .floating-qr-popup {
      display: block;
    }

    /* Responsive */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.3rem;
      }
      .grid-4, .hero-stats-grid, .steps-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .faq-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
    }

    @media (max-width: 768px) {
      .section {
        padding: 56px 0;
      }
      .hero-section {
        padding: 64px 0;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-3, .grid-4, .hero-stats-grid, .steps-row, .grid-2 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .form-wrapper {
        padding: 24px;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }