:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --color-brand: #2563eb;
      --color-brand-dark: #1d4ed8;
      --color-accent: #ff5722;
      --color-accent-alt: #059669;
      --color-tag-bg: #e0f2fe;
      --color-tag-text: #0369a1;
      --border-light: #e2e8f0;
      --border-accent: #cbd5e1;
      --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(37, 99, 235, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
      --shadow-lg: 0 20px 30px -10px rgba(15, 23, 42, 0.1);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: linear-gradient(180deg, #f0f7ff 0%, #f8fafc 400px, #ffffff 100%);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      overflow-x: hidden;
    }

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

    /* Header */
    header.site-header {
      width: 100%;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 1000;
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

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

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

    .brand-wrap .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
      display: block;
    }

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

    .brand-text span {
      color: var(--color-accent);
    }

    .nav-menu {
      display: flex;
      align-items: center;
    }

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

    .nav-links li a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 14px;
      font-weight: 600;
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      display: inline-block;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--color-brand);
      background: #eff6ff;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 700;
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--color-brand);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
    }

    .btn-primary:hover {
      background: var(--color-brand-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.4);
    }

    .btn-accent {
      background: var(--color-accent);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(255, 87, 34, 0.3);
    }

    .btn-accent:hover {
      background: #e64a19;
      transform: translateY(-2px);
    }

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

    .btn-outline:hover {
      border-color: var(--color-brand);
      color: var(--color-brand);
      background: #eff6ff;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* Main Container */
    main {
      width: 100%;
      flex: 1;
    }

    section {
      padding: 70px 0;
      position: relative;
    }

    .section-head {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 50px;
    }

    .badge-label {
      display: inline-block;
      padding: 6px 16px;
      background: #e0f2fe;
      color: #0284c7;
      font-size: 13px;
      font-weight: 700;
      border-radius: 30px;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
      border: 1px solid #bae6fd;
    }

    .badge-accent {
      background: #ffedd5;
      color: #c2410c;
      border-color: #fed7aa;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

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

    /* Hero Section (No Images Allowed) */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 0%, #e0f2fe 0%, #f8fafc 70%);
      border-bottom: 1px solid var(--border-light);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 38px;
      font-weight: 900;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-content h1 .highlight-text {
      color: var(--color-brand);
      position: relative;
      display: inline-block;
    }

    .hero-content p {
      font-size: 17px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 30px;
    }

    .hero-btns {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }

    .hero-btn-large {
      padding: 14px 32px;
      font-size: 16px;
      font-weight: 800;
      border-radius: var(--radius-md);
    }

    .hero-stats-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      padding-top: 24px;
      border-top: 1px dashed var(--border-accent);
    }

    .hero-stat-item h4 {
      font-size: 24px;
      font-weight: 800;
      color: var(--color-brand);
      margin-bottom: 4px;
    }

    .hero-stat-item p {
      font-size: 13px;
      color: var(--text-muted);
      margin: 0;
    }

    .hero-visual-card {
      background: #ffffff;
      border: 2px solid #dbeafe;
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

    .visual-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 24px;
      padding-bottom: 14px;
      border-bottom: 1px solid var(--border-light);
    }

    .status-dot {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      font-weight: 700;
      color: #059669;
      background: #ecfdf5;
      padding: 4px 10px;
      border-radius: 20px;
    }

    .status-dot::before {
      content: "";
      width: 8px;
      height: 8px;
      background: #10b981;
      border-radius: 50%;
    }

    .model-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 20px;
    }

    .model-pill {
      background: #f1f5f9;
      color: var(--text-main);
      padding: 6px 12px;
      border-radius: var(--radius-sm);
      font-size: 12px;
      font-weight: 600;
      border: 1px solid #e2e8f0;
    }

    .model-pill.hot {
      background: #eff6ff;
      color: var(--color-brand);
      border-color: #bfdbfe;
    }

    .workflow-box {
      background: #f8fafc;
      border-radius: var(--radius-md);
      padding: 16px;
      border: 1px solid var(--border-light);
    }

    .workflow-step {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 10px;
      background: #ffffff;
      border-radius: var(--radius-sm);
      margin-bottom: 8px;
      box-shadow: var(--shadow-sm);
      border-left: 3px solid var(--color-brand);
      font-size: 13px;
      font-weight: 600;
    }

    .workflow-step:last-child {
      margin-bottom: 0;
      border-left-color: var(--color-accent);
    }

    /* Grid Layouts */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .cards-grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 20px;
    }

    .service-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 26px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #bfdbfe;
    }

    .service-icon-box {
      width: 48px;
      height: 48px;
      background: #eff6ff;
      color: var(--color-brand);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 900;
      margin-bottom: 18px;
    }

    .service-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .service-tag {
      font-size: 12px;
      font-weight: 600;
      color: var(--color-brand);
      background: #f0f7ff;
      padding: 4px 8px;
      border-radius: 4px;
      align-self: flex-start;
    }

    /* Showcase & Banner Images (Only after Hero) */
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

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

    .banner-item img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .banner-item:hover img {
      transform: scale(1.03);
    }

    .material-split {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 24px;
      margin-top: 30px;
    }

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

    .material-card img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      display: block;
    }

    .material-info {
      padding: 20px;
    }

    .material-info h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .material-info p {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* Platform Capabilities & Intro */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }

    .intro-item-list {
      display: grid;
      gap: 16px;
    }

    .intro-feature {
      display: flex;
      gap: 16px;
      background: #ffffff;
      padding: 18px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
    }

    .intro-feature-num {
      width: 36px;
      height: 36px;
      background: var(--color-accent);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 15px;
      flex-shrink: 0;
    }

    .intro-feature-text h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 4px;
    }

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

    /* Comparison Table */
    .compare-section {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

    .compare-score-badge {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      background: #fff7ed;
      border: 1px solid #ffedd5;
      padding: 12px 24px;
      border-radius: var(--radius-md);
      margin-bottom: 24px;
    }

    .score-number {
      font-size: 32px;
      font-weight: 900;
      color: var(--color-accent);
    }

    .score-text {
      font-size: 14px;
      color: #9a3412;
      font-weight: 600;
    }

    .score-stars {
      color: #f59e0b;
      font-size: 18px;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }

    .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: 14px;
    }

    .compare-table th {
      background: #f8fafc;
      font-weight: 800;
      color: var(--text-main);
    }

    .compare-table tr:hover td {
      background: #f0fdf4;
    }

    .compare-highlight {
      background: #eff6ff;
      font-weight: 700;
      color: var(--color-brand);
    }

    /* Process Flow */
    .steps-wrapper {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
    }

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

    .step-index {
      font-size: 28px;
      font-weight: 900;
      color: #bfdbfe;
      margin-bottom: 10px;
    }

    .step-card h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* Testimonials */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

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

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

    .user-avatar-tag {
      width: 44px;
      height: 44px;
      background: #e0f2fe;
      color: var(--color-brand);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 16px;
    }

    .user-meta h4 {
      font-size: 15px;
      font-weight: 700;
    }

    .user-meta p {
      font-size: 12px;
      color: var(--text-muted);
    }

    .review-text {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.6;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 22px;
      background: none;
      border: none;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
    }

    .faq-question:hover {
      background: #f8fafc;
      color: var(--color-brand);
    }

    .faq-toggle-icon {
      font-size: 18px;
      font-weight: 800;
      color: var(--text-muted);
      transition: transform 0.3s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      padding: 0 22px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 500px;
      padding: 0 22px 18px;
      transition: max-height 0.4s ease-in-out;
    }

    /* Form Section */
    .form-section-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
    }

    .form-grid-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .form-left h3 {
      font-size: 24px;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .form-left p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
      line-height: 1.6;
    }

    .contact-item-row {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
      font-size: 14px;
      color: var(--text-main);
    }

    .contact-qr-wrap {
      margin-top: 20px;
      padding: 16px;
      background: #f8fafc;
      border-radius: var(--radius-md);
      display: inline-block;
      border: 1px solid var(--border-light);
    }

    .contact-qr-wrap img {
      width: 130px;
      height: 130px;
      object-fit: contain;
      display: block;
      border-radius: var(--radius-sm);
    }

    .contact-qr-wrap p {
      font-size: 12px;
      text-align: center;
      margin-top: 8px;
      margin-bottom: 0;
      font-weight: 600;
    }

    .form-right {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-accent);
      font-size: 14px;
      font-family: inherit;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--color-brand);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }

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

    .article-links-box h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 12px;
    }

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

    .links-tags-flex a {
      font-size: 13px;
      color: var(--color-brand);
      text-decoration: none;
      background: #eff6ff;
      padding: 6px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid #dbeafe;
      transition: all 0.2s ease;
    }

    .links-tags-flex a:hover {
      background: var(--color-brand);
      color: #ffffff;
    }

    /* Footer */
    footer.site-footer {
      width: 100%;
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 30px;
      border-top: 1px solid #1e293b;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-col p {
      font-size: 13px;
      line-height: 1.7;
      margin-bottom: 10px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links-list li a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 13px;
      transition: color 0.2s ease;
    }

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

    .friend-links-area {
      padding-top: 24px;
      border-top: 1px solid #1e293b;
      margin-bottom: 24px;
    }

    .friend-links-area h5 {
      color: #cbd5e1;
      font-size: 13px;
      margin-bottom: 10px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .friend-links-list a {
      color: #64748b;
      font-size: 12px;
      text-decoration: none;
      transition: color 0.2s;
    }

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

    .footer-bottom {
      text-align: center;
      font-size: 12px;
      color: #64748b;
      padding-top: 20px;
      border-top: 1px solid #1e293b;
    }

    /* Floating Contact */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: var(--color-brand);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      font-size: 18px;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      border: none;
      transition: transform 0.2s ease;
    }

    .float-btn:hover {
      transform: scale(1.1);
      background: var(--color-accent);
    }

    /* Responsive */
    @media (max-width: 992px) {
      .hero-grid,
      .intro-grid,
      .form-grid-layout,
      .footer-inner,
      .material-split {
        grid-template-columns: 1fr;
      }

      .banner-gallery {
        grid-template-columns: 1fr;
      }

      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        border-bottom: 1px solid var(--border-light);
      }

      .nav-menu.active {
        display: block;
      }

      .nav-links {
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
      }

      .nav-links li {
        width: 100%;
      }

      .nav-links li a {
        width: 100%;
        padding: 12px 10px;
      }

      .menu-toggle {
        display: block;
      }

      .hero-content h1 {
        font-size: 30px;
      }
    }