:root {
      --c-red: #ff4d4f;
      --c-orange: #fa8c16;
      --c-yellow: #faad14;
      --c-green: #52c41a;
      --c-cyan: #13c2c2;
      --c-blue: #1890ff;
      --c-purple: #722ed1;
      --c-magenta: #eb2f96;
      --primary: #4361ee;
      --primary-gradient: linear-gradient(135deg, #ff4d4f 0%, #fa8c16 16%, #fadb14 33%, #52c41a 50%, #13c2c2 66%, #1890ff 83%, #722ed1 100%);
      --text-main: #1f2937;
      --text-sub: #4b5563;
      --text-muted: #6b7280;
      --bg-page: #f9fafb;
      --bg-card: #ffffff;
      --border-color: #e5e7eb;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.06);
      --shadow-lg: 0 16px 36px rgba(0,0,0,0.08);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --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-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    ul, ol {
      list-style: none;
    }

    .rainbow-bar {
      height: 4px;
      background: var(--primary-gradient);
      width: 100%;
      position: sticky;
      top: 0;
      z-index: 1001;
    }

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

    /* Header Nav */
    .site-header {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 4px;
      z-index: 1000;
      transition: var(--transition);
    }

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

    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-sub);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      display: block;
    }

    .nav-links li a:hover {
      color: var(--c-blue);
      background: rgba(24, 144, 255, 0.06);
    }

    .nav-actions {
      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-full);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-rainbow {
      background: var(--primary-gradient);
      color: #ffffff !important;
      background-size: 200% 200%;
      animation: rainbowGlow 6s ease infinite;
      box-shadow: 0 4px 14px rgba(24, 144, 255, 0.35);
    }

    .btn-rainbow:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(24, 144, 255, 0.45);
    }

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

    .btn-outline:hover {
      border-color: var(--c-blue);
      color: var(--c-blue);
      background: rgba(24, 144, 255, 0.04);
    }

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

    /* Section Global */
    section {
      padding: 70px 0;
      position: relative;
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }

    .badge-rainbow {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      border-radius: var(--radius-full);
      background: linear-gradient(90deg, rgba(255,77,79,0.1), rgba(24,144,255,0.1), rgba(114,46,209,0.1));
      color: var(--c-purple);
      border: 1px solid rgba(114,46,209,0.2);
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

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

    /* Hero Section (No Images Allowed) */
    .hero-section {
      padding: 90px 0 80px 0;
      background: radial-gradient(circle at 50% 10%, rgba(24, 144, 255, 0.08) 0%, rgba(250, 140, 22, 0.05) 50%, rgba(249, 250, 251, 1) 100%);
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 860px;
      margin: 0 auto;
    }

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

    .hero-title {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      color: #111827;
      letter-spacing: -0.5px;
    }

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

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

    .hero-cta-btn {
      padding: 14px 34px;
      font-size: 1.1rem;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .stat-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 14px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border-top: 3px solid transparent;
    }

    .stat-box:nth-child(1) { border-top-color: var(--c-red); }
    .stat-box:nth-child(2) { border-top-color: var(--c-yellow); }
    .stat-box:nth-child(3) { border-top-color: var(--c-green); }
    .stat-box:nth-child(4) { border-top-color: var(--c-blue); }

    .stat-box:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .stat-num {
      font-size: 1.7rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* Model Badges Wall */
    .model-wall {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 26px 0;
    }

    .model-wall-label {
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 16px;
      font-weight: 600;
      letter-spacing: 1px;
    }

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

    .model-pill {
      font-size: 0.85rem;
      padding: 5px 12px;
      background: #f3f4f6;
      color: var(--text-sub);
      border-radius: var(--radius-full);
      border: 1px solid #e5e7eb;
      font-weight: 500;
      transition: var(--transition);
    }

    .model-pill:hover {
      background: #ffffff;
      border-color: var(--c-blue);
      color: var(--c-blue);
      transform: scale(1.05);
    }

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

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

    .card-item::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: var(--primary-gradient);
      opacity: 0;
      transition: var(--transition);
    }

    .card-item:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(67, 97, 238, 0.2);
    }

    .card-item:hover::after {
      opacity: 1;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.35rem;
      margin-bottom: 18px;
      background: linear-gradient(135deg, rgba(24, 144, 255, 0.1), rgba(114, 46, 209, 0.1));
      color: var(--primary);
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-meta {
      margin-top: 18px;
      padding-top: 14px;
      border-top: 1px dashed var(--border-color);
      font-size: 0.85rem;
      color: var(--c-blue);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    /* Workflow Steps */
    .steps-container {
      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;
      box-shadow: var(--shadow-sm);
    }

    .step-badge {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px auto;
      font-size: 1.1rem;
    }

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

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

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

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

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

    .comp-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
      font-size: 0.95rem;
    }

    .comp-table td {
      font-size: 0.95rem;
      color: var(--text-sub);
    }

    .comp-table tr:hover td {
      background: #fdfdfd;
    }

    .highlight-col {
      background: rgba(24, 144, 255, 0.03);
      font-weight: 600;
      color: var(--primary) !important;
    }

    .score-banner {
      background: linear-gradient(135deg, #1890ff 0%, #722ed1 100%);
      border-radius: var(--radius-md);
      padding: 28px;
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 24px;
      flex-wrap: wrap;
      gap: 16px;
    }

    .score-left h3 {
      font-size: 1.5rem;
      margin-bottom: 6px;
    }

    .score-left p {
      opacity: 0.9;
      font-size: 0.95rem;
    }

    .score-val {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1;
      display: flex;
      align-items: baseline;
      gap: 4px;
    }

    .score-max {
      font-size: 1.2rem;
      opacity: 0.8;
      font-weight: 500;
    }

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

    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
    }

    .media-card img {
      width: 100%;
      height: auto;
      border-radius: var(--radius-sm);
      object-fit: cover;
      display: block;
      margin-bottom: 14px;
    }

    .media-card h4 {
      font-size: 1.1rem;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .media-card p {
      font-size: 0.9rem;
      color: var(--text-sub);
    }

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

    .review-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;
      justify-content: space-between;
      position: relative;
    }

    .review-stars {
      color: var(--c-yellow);
      margin-bottom: 12px;
      font-size: 1.1rem;
    }

    .review-text {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 18px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f3f4f6;
      padding-top: 12px;
    }

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, #1890ff, #722ed1);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .author-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .author-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 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);
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: #fafbfc;
      color: var(--text-sub);
      font-size: 0.95rem;
      line-height: 1.7;
      padding: 0 24px;
    }

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

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

    .faq-item.active .faq-answer {
      padding: 16px 24px 20px 24px;
      max-height: 220px;
    }

    /* Form & Contact Section */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 32px;
      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-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

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

    .form-control:focus {
      border-color: var(--c-blue);
      box-shadow: 0 0 0 3px rgba(24, 144, 255, 0.15);
    }

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

    .contact-info-panel {
      background: #f8fafc;
      border-radius: var(--radius-md);
      padding: 30px;
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-item-row {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
      font-size: 0.95rem;
      color: var(--text-sub);
    }

    .qr-container {
      margin-top: 20px;
      padding-top: 20px;
      border-top: 1px dashed var(--border-color);
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .qr-box {
      width: 110px;
      height: 110px;
      background: #fff;
      padding: 6px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
    }

    .qr-box img {
      width: 100%;
      height: 100%;
      display: block;
    }

    /* Articles & Friendly Links */
    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 30px;
    }

    .links-tag-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .link-tag {
      background: #f3f4f6;
      color: var(--text-sub);
      padding: 6px 14px;
      border-radius: var(--radius-full);
      font-size: 0.85rem;
      border: 1px solid #e5e7eb;
    }

    .link-tag:hover {
      background: #ffffff;
      border-color: var(--c-blue);
      color: var(--c-blue);
    }

    /* Footer */
    .site-footer {
      background: #111827;
      color: #9ca3af;
      padding: 50px 0 24px 0;
      border-top: 4px solid var(--c-blue);
    }

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

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.3rem;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.7;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 14px;
      font-weight: 600;
    }

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

    .footer-col ul li a {
      color: #9ca3af;
      font-size: 0.9rem;
    }

    .footer-col ul li a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #374151;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #6b7280;
    }

    /* Floating Customer Service */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      color: var(--text-main);
      cursor: pointer;
      border: 1px solid var(--border-color);
      transition: var(--transition);
      position: relative;
    }

    .float-btn:hover {
      background: var(--c-blue);
      color: #ffffff;
      transform: scale(1.08);
    }

    .float-qr-pop {
      position: absolute;
      right: 58px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 160px;
      text-align: center;
    }

    .float-qr-pop img {
      width: 100%;
      height: auto;
      border-radius: 4px;
    }

    .float-qr-pop span {
      display: block;
      font-size: 0.8rem;
      color: var(--text-sub);
      margin-top: 6px;
    }

    .float-btn-qr:hover .float-qr-pop {
      display: block;
    }

    @keyframes rainbowGlow {
      0% { background-position: 0% 50%; }
      50% { background-position: 100% 50%; }
      100% { background-position: 0% 50%; }
    }

    /* Responsive */
    @media (max-width: 992px) {
      .cards-grid { grid-template-columns: repeat(2, 1fr); }
      .steps-container { grid-template-columns: repeat(2, 1fr); }
      .review-grid { grid-template-columns: repeat(2, 1fr); }
      .contact-wrapper { grid-template-columns: 1fr; }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .media-grid { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 2rem;
      }
      .cards-grid, .steps-container, .review-grid, .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }