:root {
      --primary: #ff3366;
      --primary-gradient: linear-gradient(135deg, #ff0055 0%, #ff5500 50%, #7928ca 100%);
      --accent-cyan: #00f2fe;
      --accent-purple: #7928ca;
      --accent-amber: #ff9900;
      --text-main: #1f242d;
      --text-muted: #5c6479;
      --bg-page: #f8faff;
      --bg-card: #ffffff;
      --border-color: #e2e8f5;
      --shadow-sm: 0 4px 12px rgba(255, 0, 85, 0.06);
      --shadow-md: 0 10px 30px rgba(121, 40, 202, 0.08);
      --shadow-lg: 0 18px 45px rgba(255, 0, 85, 0.12);
      --radius: 16px;
      --container-max: 1200px;
    }
    * {
      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-page);
      color: var(--text-main);
    }
    body {
      line-height: 1.65;
      background: radial-gradient(circle at 10% 0%, rgba(255, 0, 85, 0.03) 0%, transparent 40%),
                  radial-gradient(circle at 90% 20%, rgba(0, 242, 254, 0.04) 0%, transparent 45%),
                  radial-gradient(circle at 50% 80%, rgba(121, 40, 202, 0.03) 0%, transparent 50%),
                  #f8faff;
      min-height: 100vh;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
    }
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 700;
      color: #ffffff;
      background: var(--primary-gradient);
      box-shadow: 0 4px 15px rgba(255, 0, 85, 0.3);
      margin-bottom: 14px;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 45px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: #111625;
      line-height: 1.3;
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }
    .section-title span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* Header & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(226, 232, 245, 0.8);
      transition: all 0.3s ease;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
      display: block;
    }
    .brand-title {
      font-size: 20px;
      font-weight: 800;
      color: #0d1117;
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      font-size: 14px;
      font-weight: 600;
      color: #3b4256;
      padding: 10px 14px;
      border-radius: 8px;
      display: inline-block;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: #ff0055;
      background: rgba(255, 0, 85, 0.05);
    }
    .nav-action-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 700;
      border-radius: 10px;
      border: none;
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      text-align: center;
    }
    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 6px 20px rgba(255, 0, 85, 0.3);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(255, 0, 85, 0.42);
    }
    .btn-outline {
      background: #ffffff;
      color: #1a1e28;
      border: 1px solid #d4dcfa;
    }
    .btn-outline:hover {
      border-color: #ff0055;
      color: #ff0055;
      background: rgba(255, 0, 85, 0.03);
    }
    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      font-size: 24px;
      color: #1a1e28;
      cursor: pointer;
    }

    /* Hero Section (Strictly Pure CSS, No Images) */
    .hero-section {
      padding: 60px 0 50px;
      position: relative;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr;
      text-align: center;
      gap: 30px;
    }
    .hero-content {
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-tag-glow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid #ffccd8;
      color: #ff0055;
      padding: 7px 18px;
      border-radius: 999px;
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 20px;
      box-shadow: 0 6px 16px rgba(255, 0, 85, 0.08);
    }
    .hero-title {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      color: #0b0f19;
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }
    .hero-title .glow-text {
      background: linear-gradient(135deg, #ff0055 0%, #ff7700 50%, #7928ca 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 18px;
      color: #4b556b;
      margin-bottom: 30px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-btn-wrap {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .hero-official-btn {
      font-size: 16px;
      padding: 14px 34px;
      border-radius: 12px;
    }

    /* Model Tag Grid in Hero */
    .hero-models-card {
      background: #ffffff;
      border: 1px solid #e1e7f5;
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-md);
      text-align: left;
    }
    .hero-models-card h3 {
      font-size: 14px;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #7928ca;
      font-weight: 800;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .model-tags-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .model-tag-item {
      font-size: 12px;
      font-weight: 700;
      padding: 5px 12px;
      border-radius: 6px;
      background: #f1f4fc;
      color: #333d52;
      border: 1px solid #dce4f7;
      transition: all 0.2s ease;
    }
    .model-tag-item:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: translateY(-2px);
    }
    .model-tag-item.highlight {
      background: rgba(255, 0, 85, 0.08);
      color: #ff0055;
      border-color: rgba(255, 0, 85, 0.3);
    }

    /* Stats Ribbon */
    .stats-ribbon {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }
    .stat-card {
      background: #ffffff;
      border: 1px solid #e5eaf8;
      border-radius: var(--radius);
      padding: 24px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease;
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .stat-number {
      font-size: 32px;
      font-weight: 900;
      color: #ff0055;
      margin-bottom: 4px;
      line-height: 1.1;
    }
    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* Cards Grid */
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .feature-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--primary-gradient);
      opacity: 0;
      transition: opacity 0.3s ease;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: #ffb8ca;
    }
    .feature-card:hover::before {
      opacity: 1;
    }
    .feature-icon-box {
      width: 50px;
      height: 50px;
      border-radius: 12px;
      background: rgba(255, 0, 85, 0.08);
      color: #ff0055;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 900;
      margin-bottom: 18px;
    }
    .feature-card h3 {
      font-size: 18px;
      font-weight: 800;
      color: #111625;
      margin-bottom: 10px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .feature-meta {
      margin-top: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 12px;
      font-weight: 700;
      color: #7928ca;
    }

    /* Media Sections */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: transform 0.3s ease;
    }
    .media-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
    }
    .media-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #eef2fa;
      overflow: hidden;
    }
    .media-img-wrap.square {
      aspect-ratio: 1 / 1;
    }
    .media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }
    .media-card:hover .media-img-wrap img {
      transform: scale(1.04);
    }
    .media-content {
      padding: 22px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .media-content h3 {
      font-size: 17px;
      font-weight: 800;
      margin-bottom: 8px;
    }
    .media-content p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Comparison Table Section */
    .compare-table-wrap {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow-x: auto;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #edf1fa;
      font-size: 14px;
    }
    .compare-table th {
      background: #f8faff;
      color: #3b4256;
      font-weight: 800;
    }
    .compare-table td.highlight-cell {
      background: rgba(255, 0, 85, 0.03);
      font-weight: 700;
      color: #ff0055;
    }
    .rating-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #fff0f4;
      border: 1px solid #ffd1dc;
      padding: 4px 10px;
      border-radius: 6px;
      color: #ff0055;
      font-weight: 800;
      font-size: 13px;
    }

    /* Process Flow */
    .flow-steps {
      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);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 900;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      margin-bottom: 14px;
    }
    .step-card h3 {
      font-size: 16px;
      font-weight: 800;
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Testimonial Cards */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-body {
      font-size: 14px;
      color: #3b4256;
      line-height: 1.6;
      margin-bottom: 18px;
      position: relative;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed #e7ecf8;
      padding-top: 14px;
    }
    .user-avatar-initial {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, #7928ca, #ff0055);
      color: #fff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
    }
    .user-name {
      font-size: 14px;
      font-weight: 700;
      color: #111625;
    }
    .user-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ Accordion */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
      transition: all 0.25s ease;
    }
    .faq-item.active {
      border-color: #ff99b3;
      box-shadow: 0 4px 16px rgba(255, 0, 85, 0.08);
    }
    .faq-question {
      padding: 18px 22px;
      font-size: 15px;
      font-weight: 700;
      color: #111625;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }
    .faq-question::after {
      content: "+";
      font-size: 20px;
      font-weight: 400;
      color: #ff0055;
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-question::after {
      content: "−";
      transform: rotate(180deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fafcff;
      border-top: 1px solid transparent;
    }
    .faq-item.active .faq-answer {
      border-color: #edf2fc;
    }
    .faq-answer-inner {
      padding: 16px 22px 20px;
      font-size: 14px;
      color: #4e586e;
      line-height: 1.6;
    }

    /* Contact & Form Section */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: start;
    }
    .contact-info-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }
    .contact-info-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      margin-bottom: 20px;
    }
    .contact-icon {
      width: 38px;
      height: 38px;
      border-radius: 8px;
      background: #f1f4fd;
      color: #7928ca;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      flex-shrink: 0;
    }
    .contact-text h4 {
      font-size: 14px;
      font-weight: 700;
      color: #111625;
    }
    .contact-text p {
      font-size: 14px;
      color: var(--text-muted);
    }
    .qr-box-wrap {
      margin-top: 24px;
      display: inline-block;
      text-align: center;
      padding: 16px;
      background: #f9fbff;
      border: 1px dashed #d1dcfa;
      border-radius: 12px;
    }
    .qr-box-wrap img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      display: block;
      margin: 0 auto 8px;
      border-radius: 6px;
    }
    .qr-box-wrap span {
      font-size: 12px;
      font-weight: 600;
      color: var(--text-muted);
    }

    .form-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 700;
      color: #2b3346;
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      font-size: 14px;
      border: 1px solid #d8e1f2;
      border-radius: 8px;
      background: #fdfefe;
      color: #1f242d;
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }
    .form-control:focus {
      border-color: #ff0055;
      box-shadow: 0 0 0 3px rgba(255, 0, 85, 0.12);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }

    /* Articles & Links Section */
    .article-pills-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 24px;
    }
    .article-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 8px;
      font-size: 13px;
      color: #3b4256;
      font-weight: 600;
      transition: all 0.2s ease;
    }
    .article-pill:hover {
      border-color: #ff0055;
      color: #ff0055;
      background: #fff8fa;
    }

    /* Footer */
    .site-footer {
      background: #0f131f;
      color: #a4b0cb;
      padding: 50px 0 30px;
      font-size: 13px;
      border-top: 3px solid #ff0055;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 15px;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-links a {
      color: #8c99b5;
    }
    .footer-links a:hover {
      color: #ff5588;
    }
    .footer-bottom {
      border-top: 1px solid #1f273d;
      padding-top: 24px;
      text-align: center;
      color: #6a7694;
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
      margin-top: 14px;
    }
    .friend-links-box a {
      color: #8c99b5;
      font-size: 12px;
      background: #181f33;
      padding: 4px 10px;
      border-radius: 4px;
    }
    .friend-links-box a:hover {
      color: #ffffff;
      background: #ff0055;
    }

    /* Floating Customer Service & Back to top */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 25px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 20px rgba(255, 0, 85, 0.4);
      cursor: pointer;
      font-size: 18px;
      border: none;
      transition: transform 0.2s ease;
    }
    .float-btn:hover {
      transform: scale(1.08);
    }

    /* Responsive */
    @media (max-width: 992px) {
      .card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .card-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-ribbon {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-title {
        font-size: 32px;
      }
    }
    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid #e2e8f5;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 12px 16px;
      }
      .card-grid-3,
      .card-grid-2,
      .card-grid-4,
      .flow-steps,
      .stats-ribbon {
        grid-template-columns: 1fr;
      }
      .section-wrap {
        padding: 50px 0;
      }
      .hero-title {
        font-size: 26px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }