:root {
      --primary: #7928ca;
      --primary-light: #9e55f3;
      --primary-dark: #581c87;
      --accent: #d946ef;
      --accent-glow: rgba(217, 70, 239, 0.15);
      --bg-main: #faf7ff;
      --bg-card: #ffffff;
      --bg-alt: #f3ebff;
      --text-main: #1f1a2e;
      --text-muted: #5e5772;
      --text-light: #8982a2;
      --border-color: #ebdffc;
      --shadow-sm: 0 4px 12px rgba(121, 40, 202, 0.05);
      --shadow-md: 0 10px 25px rgba(121, 40, 202, 0.08);
      --shadow-lg: 0 20px 40px rgba(121, 40, 202, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      font-size: 16px;
      background-color: var(--bg-main);
      color: var(--text-main);
    }

    body {
      min-height: 100vh;
      line-height: 1.6;
      overflow-x: hidden;
      background: radial-gradient(circle at 10% 10%, rgba(217, 70, 239, 0.05) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(121, 40, 202, 0.05) 0%, transparent 40%),
                  var(--bg-main);
    }

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

    /* Header & Navigation */
    header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

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

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

    .nav-links li a {
      color: var(--text-main);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(121, 40, 202, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(121, 40, 202, 0.4);
    }

    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--bg-alt);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* Section Global */
    section {
      padding: 80px 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 50px;
    }

    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      background: var(--bg-alt);
      border: 1px solid var(--border-color);
      border-radius: 50px;
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2.2rem;
      color: var(--text-main);
      margin-bottom: 16px;
      font-weight: 700;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

    /* Hero Section (No Images Allowed) */
    .hero-section {
      padding: 90px 0 70px;
      background: linear-gradient(180deg, rgba(235, 223, 252, 0.4) 0%, var(--bg-main) 100%);
      text-align: center;
      position: relative;
    }

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

    .hero-title {
      font-size: 2.8rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      max-width: 900px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto 36px;
    }

    .hero-cta {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }

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

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

    .metric-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
    }

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

    /* Model Tag Cloud */
    .model-marquee {
      margin-top: 40px;
      padding: 16px;
      background: rgba(255, 255, 255, 0.7);
      border-radius: var(--radius-md);
      border: 1px dashed var(--border-color);
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-chip {
      padding: 5px 12px;
      background: var(--bg-alt);
      color: var(--primary-dark);
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 500;
    }

    /* Cards & 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;
      align-items: center;
    }

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

    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary-light);
    }

    .card-icon {
      width: 50px;
      height: 50px;
      background: var(--bg-alt);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      color: var(--primary);
      margin-bottom: 18px;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

    .step-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      text-align: center;
    }

    .step-badge {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

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

    /* Comparison Table & Rating */
    .eval-highlight {
      background: linear-gradient(135deg, #fbf7ff 0%, #f3e8ff 100%);
      border: 2px solid var(--primary-light);
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 36px;
      display: flex;
      justify-content: space-around;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      text-align: center;
    }

    .eval-score {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .eval-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      margin-top: 4px;
    }

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

    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    th, td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    th {
      background: var(--bg-alt);
      font-weight: 700;
      color: var(--primary-dark);
      font-size: 0.95rem;
    }

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

    .tag-check {
      color: #10b981;
      font-weight: 700;
    }

    .tag-cross {
      color: #ef4444;
    }

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

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

    .media-img-wrapper {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: var(--bg-alt);
    }

    .media-img-wrapper.square {
      aspect-ratio: 1 / 1;
      max-height: 320px;
    }

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

    .media-card:hover .media-img-wrapper img {
      transform: scale(1.04);
    }

    .media-body {
      padding: 20px;
    }

    .media-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .media-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

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

    .testimonial-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .avatar-icon {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent) 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .user-info h4 {
      font-size: 1rem;
      color: var(--text-main);
    }

    .user-info p {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    .testimonial-body {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* FAQ Accordion */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 20px;
      font-weight: 600;
      font-size: 1.05rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

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

    .faq-toggle {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--primary);
      transition: var(--transition);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: var(--bg-alt);
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    .faq-answer-inner {
      padding: 16px 20px 20px;
    }

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

    .contact-info {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .info-box {
      display: flex;
      align-items: flex-start;
      gap: 16px;
    }

    .info-box-icon {
      width: 42px;
      height: 42px;
      border-radius: var(--radius-sm);
      background: var(--bg-alt);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      flex-shrink: 0;
    }

    .info-box-content h4 {
      font-size: 1rem;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .info-box-content p, .info-box-content a {
      font-size: 0.9rem;
      color: var(--text-muted);
      text-decoration: none;
    }

    .qr-box {
      margin-top: 10px;
      padding: 16px;
      background: var(--bg-alt);
      border-radius: var(--radius-md);
      display: inline-block;
      text-align: center;
      width: fit-content;
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      display: block;
      margin: 0 auto 8px;
      border-radius: var(--radius-sm);
    }

    .qr-box span {
      font-size: 0.82rem;
      color: var(--primary-dark);
      font-weight: 600;
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #fafafa;
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px var(--accent-glow);
    }

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

    /* Article Links & Resource Section */
    .article-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-item {
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      color: var(--text-main);
      text-decoration: none;
      font-size: 0.88rem;
      transition: var(--transition);
    }

    .article-item:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--bg-alt);
    }

    /* Footer */
    footer {
      background: #191426;
      color: #d1cbe5;
      padding: 60px 0 30px;
      margin-top: 60px;
      border-top: 1px solid #32294a;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.1rem;
      margin-bottom: 18px;
    }

    .footer-col p {
      font-size: 0.9rem;
      line-height: 1.6;
      color: #a79fc2;
      margin-bottom: 14px;
    }

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

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

    .footer-links li a {
      color: #a79fc2;
      text-decoration: none;
      font-size: 0.9rem;
      transition: var(--transition);
    }

    .footer-links li a:hover {
      color: #ffffff;
      padding-left: 4px;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friend-links a {
      color: #a79fc2;
      font-size: 0.85rem;
      text-decoration: none;
      background: rgba(255, 255, 255, 0.06);
      padding: 4px 10px;
      border-radius: 4px;
      transition: var(--transition);
    }

    .friend-links a:hover {
      color: #ffffff;
      background: var(--primary);
    }

    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      border-top: 1px solid #2d2442;
      font-size: 0.85rem;
      color: #837b9e;
    }

    /* Floating Contact */
    .float-contact {
      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: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(121, 40, 202, 0.4);
      cursor: pointer;
      text-decoration: none;
      font-size: 1.2rem;
      transition: var(--transition);
      border: none;
    }

    .float-btn:hover {
      transform: scale(1.08);
    }

    /* Responsive */
    @media (max-width: 992px) {
      .grid-3, .grid-4, .hero-metrics, .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .hero-title {
        font-size: 2rem;
      }
      .grid-3, .grid-4, .hero-metrics, .flow-steps, .media-grid, .grid-2 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .eval-highlight {
        flex-direction: column;
      }
    }