/* CSS Reset & Variables */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    :root {
      --primary: #0052FF;
      --primary-hover: #0040CC;
      --secondary: #00D2FF;
      --accent: #FF5A1F;
      --accent-light: #FFF0EB;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --bg-page: #F8FAFC;
      --bg-card: #FFFFFF;
      --border-color: #E2E8F0;
      --border-focus: #0052FF;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(0, 82, 255, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-lg: 0 20px 35px -5px rgba(0, 82, 255, 0.12), 0 10px 15px -5px rgba(0, 0, 0, 0.04);
      --container-max: 1200px;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    ul, ol {
      list-style: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* Container Layout */
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }
    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .brand-name span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-item {
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
      display: inline-block;
    }
    .nav-item:hover, .nav-item.active {
      color: var(--primary);
      background: rgba(0, 82, 255, 0.05);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      white-space: nowrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, #0052FF 0%, #0084FF 100%);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(0, 82, 255, 0.35);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #0040CC 0%, #006EDC 100%);
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(0, 82, 255, 0.45);
      color: #FFFFFF;
    }
    .btn-outline {
      background: #FFFFFF;
      color: var(--primary);
      border-color: var(--border-color);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background: rgba(0, 82, 255, 0.04);
      color: var(--primary);
    }
    .btn-accent {
      background: linear-gradient(135deg, #FF5A1F 0%, #FF8A00 100%);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(255, 90, 31, 0.3);
    }
    .btn-accent:hover {
      background: linear-gradient(135deg, #E04812 0%, #E67600 100%);
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(255, 90, 31, 0.4);
      color: #FFFFFF;
    }
    .btn-lg {
      padding: 14px 32px;
      font-size: 1.05rem;
      border-radius: var(--radius-md);
    }
    .nav-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .nav-toggle span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: all 0.3s;
    }

    /* Section Global */
    section {
      padding: 80px 0;
      position: relative;
    }
    .section-bg-alt {
      background-color: #FFFFFF;
      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 50px auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.825rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background: rgba(0, 82, 255, 0.08);
      padding: 6px 14px;
      border-radius: 30px;
      margin-bottom: 14px;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Hero Section (No Images!) */
    .hero-section {
      padding: 100px 0 90px 0;
      background: radial-gradient(100% 100% at 50% 0%, #EBF3FF 0%, #F8FAFC 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }
    .hero-glow-1 {
      position: absolute;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(0, 210, 255, 0.15) 0%, rgba(255,255,255,0) 70%);
      top: -100px;
      left: 10%;
      pointer-events: none;
    }
    .hero-glow-2 {
      position: absolute;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0, 82, 255, 0.12) 0%, rgba(255,255,255,0) 70%);
      top: -50px;
      right: 5%;
      pointer-events: none;
    }
    .hero-inner {
      text-align: center;
      position: relative;
      z-index: 2;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #FFFFFF;
      border: 1px solid #D0E1FD;
      padding: 6px 18px;
      border-radius: 50px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary);
      box-shadow: 0 4px 12px rgba(0, 82, 255, 0.08);
      margin-bottom: 24px;
    }
    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background: #00D26A;
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(0, 210, 106, 0.2);
    }
    .hero-title {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 24px;
      letter-spacing: -1px;
    }
    .hero-title .highlight {
      background: linear-gradient(135deg, #0052FF 0%, #00C2FF 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.8;
      max-width: 760px;
      margin: 0 auto 36px auto;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .hero-stats-grid {
      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 30px;
      box-shadow: var(--shadow-md);
    }
    .stat-item {
      text-align: center;
      border-right: 1px solid var(--border-color);
    }
    .stat-item:last-child {
      border-right: none;
    }
    .stat-value {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    /* Model Badges Grid */
    .model-pills-wrap {
      margin-top: 40px;
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }
    .model-pill {
      background: #FFFFFF;
      border: 1px solid #E2E8F0;
      padding: 6px 14px;
      border-radius: 30px;
      font-size: 0.825rem;
      font-weight: 600;
      color: #334155;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s;
    }
    .model-pill:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* Grid Layouts */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
      align-items: center;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    /* Cards */
    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .feature-card:hover {
      border-color: #B9D5FF;
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
    }
    .feature-icon-box {
      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: 1.4rem;
      margin-bottom: 20px;
    }
    .feature-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .feature-desc {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .feature-tag-list {
      margin-top: 16px;
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }
    .micro-tag {
      font-size: 0.75rem;
      background: #F1F5F9;
      color: #475569;
      padding: 3px 8px;
      border-radius: 4px;
    }

    /* Comparison Table Component */
    .comparison-wrapper {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow-x: auto;
    }
    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }
    .comp-table th, .comp-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }
    .comp-table th {
      background: #F8FAFC;
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-main);
    }
    .comp-table tr:last-child td {
      border-bottom: none;
    }
    .comp-table td.primary-col {
      background: rgba(0, 82, 255, 0.02);
      font-weight: 600;
      color: var(--primary);
    }
    .score-badge-card {
      background: linear-gradient(135deg, #0052FF 0%, #0084FF 100%);
      color: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      box-shadow: var(--shadow-lg);
    }
    .score-info h3 {
      font-size: 1.6rem;
      font-weight: 800;
      margin-bottom: 8px;
    }
    .score-info p {
      font-size: 0.95rem;
      opacity: 0.9;
    }
    .score-number {
      font-size: 3.2rem;
      font-weight: 900;
      color: #FFD200;
      line-height: 1;
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .score-max {
      font-size: 1.1rem;
      color: #FFFFFF;
      opacity: 0.8;
      font-weight: 600;
    }

    /* Process Timeline Steps */
    .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: 24px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFFFFF;
      font-weight: 800;
      font-size: 1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }
    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Media Showcases */
    .media-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }
    .media-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #E2E8F0;
    }
    .media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .media-card:hover .media-img-wrap img {
      transform: scale(1.04);
    }
    .media-body {
      padding: 20px;
    }
    .media-tag {
      font-size: 0.75rem;
      color: var(--primary);
      font-weight: 700;
      margin-bottom: 6px;
      display: inline-block;
    }
    .media-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .media-text {
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    /* Testimonials / Reviews */
    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    .avatar-placeholder {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: linear-gradient(135deg, #0052FF 0%, #00C2FF 100%);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }
    .testi-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-main);
    }
    .testi-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .testi-stars {
      color: #FFB800;
      font-size: 0.85rem;
      margin-bottom: 10px;
    }
    .testi-content {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 860px;
      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;
      transition: border-color 0.2s ease;
    }
    .faq-item:hover {
      border-color: #CBD5E1;
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.025rem;
      color: var(--text-main);
      user-select: none;
    }
    .faq-icon {
      font-size: 1.25rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }
    .faq-answer {
      padding: 0 24px 20px 24px;
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
      border-top: 1px solid #F1F5F9;
      padding-top: 14px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .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: 40px;
      box-shadow: var(--shadow-md);
      max-width: 760px;
      margin: 0 auto;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .form-label {
      display: block;
      font-weight: 600;
      font-size: 0.9rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .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-color: #F8FAFC;
      transition: all 0.2s;
      outline: none;
      font-family: inherit;
    }
    .form-control:focus {
      border-color: var(--border-focus);
      background-color: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(0, 82, 255, 0.12);
    }
    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }

    /* Articles & News Section */
    .article-links-wrap {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .article-links-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .article-link-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      background: #F8FAFC;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-main);
    }
    .article-link-item:hover {
      background: #EBF3FF;
      color: var(--primary);
    }

    /* Contact & QR section */
    .contact-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .qr-container {
      width: 160px;
      height: 160px;
      margin: 0 auto 16px auto;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 6px;
      background: #FFFFFF;
    }
    .qr-container img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* Footer */
    .site-footer {
      background: #0B132B;
      color: #94A3B8;
      padding: 70px 0 30px 0;
      border-top: 1px solid #1E293B;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand h4 {
      color: #FFFFFF;
      font-size: 1.3rem;
      font-weight: 800;
      margin-bottom: 14px;
    }
    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .footer-title {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: #94A3B8;
      font-size: 0.875rem;
    }
    .footer-links a:hover {
      color: #00D2FF;
      padding-left: 4px;
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }
    .friend-links-box a {
      font-size: 0.825rem;
      color: #94A3B8;
      background: #1C2541;
      padding: 4px 10px;
      border-radius: 4px;
    }
    .friend-links-box a:hover {
      color: #FFFFFF;
      background: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.85rem;
      color: #64748B;
    }

    /* Floating Customer Service */
    .floating-kefu {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      align-items: flex-end;
      gap: 10px;
    }
    .kefu-btn {
      width: 54px;
      height: 54px;
      background: linear-gradient(135deg, #0052FF 0%, #00C2FF 100%);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFFFFF;
      font-size: 1.5rem;
      box-shadow: 0 8px 25px rgba(0, 82, 255, 0.4);
      cursor: pointer;
      transition: transform 0.25s ease;
    }
    .kefu-btn:hover {
      transform: scale(1.08);
    }
    .kefu-popover {
      display: none;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 16px;
      box-shadow: var(--shadow-lg);
      width: 180px;
      text-align: center;
    }
    .floating-kefu:hover .kefu-popover {
      display: block;
    }
    .kefu-popover img {
      width: 130px;
      height: 130px;
      margin: 0 auto 8px auto;
    }
    .kefu-popover p {
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--text-main);
    }

    /* Responsive */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.3rem;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4, .steps-row, .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .stat-item {
        border-right: none;
        padding-bottom: 12px;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-toggle {
        display: flex;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-subtitle {
        font-size: 1rem;
      }
      .grid-2, .grid-3, .grid-4, .steps-row, .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .score-badge-card {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .section-title {
        font-size: 1.75rem;
      }
    }