:root {
      --primary-color: #ff2a85;
      --secondary-color: #00d2ff;
      --accent-color: #7928ca;
      --warning-color: #ff9900;
      --dark-text: #171725;
      --sub-text: #4e5566;
      --light-text: #71778e;
      --bg-main: #fbfbfe;
      --bg-card: #ffffff;
      --bg-alt: #f4f6fc;
      --border-color: #e6ebf5;
      --border-bright: #ffd4e5;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.05);
      --shadow-hover: 0 16px 32px rgba(255, 42, 133, 0.12);
      --shadow-primary: 0 10px 24px rgba(255, 42, 133, 0.3);
      --transition: all 0.28s ease;
    }

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

    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-main);
      color: var(--dark-text);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: radial-gradient(#e5ecfb 1px, transparent 1px), radial-gradient(#ffe6f1 1px, var(--bg-main) 1px);
      background-size: 40px 40px;
      background-position: 0 0, 20px 20px;
    }

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

    img {
      display: block;
      max-width: 100%;
      height: auto;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }

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

    .brand-text {
      font-weight: 800;
      font-size: 1.3rem;
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--dark-text);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--primary-color);
      background-color: #fff0f6;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      font-weight: 700;
      padding: 10px 22px;
      border-radius: 999px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
      text-align: center;
    }

    .btn-trendy {
      background: linear-gradient(135deg, #ff2a85 0%, #ff7300 100%);
      color: #ffffff;
      box-shadow: var(--shadow-primary);
    }

    .btn-trendy:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(255, 42, 133, 0.4);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      color: var(--dark-text);
      border-color: #d1d8e6;
    }

    .btn-outline:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      background: #fff5f9;
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--dark-text);
    }

    .section-padding {
      padding-top: 80px;
      padding-bottom: 80px;
    }

    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 52px;
    }

    .badge-pill {
      display: inline-block;
      padding: 6px 16px;
      border-radius: 999px;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      margin-bottom: 14px;
      background: linear-gradient(90deg, #ffeef6, #e9f8ff);
      color: var(--primary-color);
      border: 1px solid #ffd4e5;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--dark-text);
      margin-bottom: 16px;
      line-height: 1.25;
    }

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

    .hero-section {
      padding: 90px 0 70px;
      position: relative;
      overflow: hidden;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.6) 0%, rgba(244, 246, 252, 0.8) 100%);
      border-bottom: 1px solid var(--border-color);
    }

    .hero-content {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-h1 {
      font-size: 2.8rem;
      font-weight: 900;
      letter-spacing: -0.5px;
      color: var(--dark-text);
      line-height: 1.2;
      margin-bottom: 22px;
    }

    .hero-highlight {
      background: linear-gradient(135deg, #ff007a 0%, #7928ca 50%, #00d2ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.18rem;
      color: var(--sub-text);
      max-width: 760px;
      margin: 0 auto 34px;
      font-weight: 500;
    }

    .hero-btn-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 18px;
      margin-bottom: 52px;
      flex-wrap: wrap;
    }

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

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

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border-top: 4px solid var(--primary-color);
    }

    .stat-card:nth-child(2) { border-top-color: var(--accent-color); }
    .stat-card:nth-child(3) { border-top-color: var(--secondary-color); }
    .stat-card:nth-child(4) { border-top-color: var(--warning-color); }

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

    .stat-val {
      font-size: 2rem;
      font-weight: 800;
      color: var(--dark-text);
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--light-text);
      font-weight: 600;
    }

    .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;
    }

    .trendy-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
      position: relative;
    }

    .trendy-card:hover {
      transform: translateY(-5px);
      border-color: var(--border-bright);
      box-shadow: var(--shadow-hover);
    }

    .card-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: linear-gradient(135deg, #fff0f6 0%, #f0f7ff 100%);
      border: 1px solid #ffd4e5;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 1.4rem;
      font-weight: bold;
      color: var(--primary-color);
    }

    .trendy-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 12px;
    }

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

    .feature-tag {
      display: inline-block;
      align-self: flex-start;
      margin-top: 16px;
      font-size: 0.78rem;
      font-weight: 700;
      padding: 4px 10px;
      background: var(--bg-alt);
      border-radius: var(--radius-sm);
      color: var(--accent-color);
    }

    .models-cloud-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .models-tags-container {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
    }

    .model-chip {
      background: #fafbfe;
      border: 1px solid #e1e7f5;
      padding: 8px 18px;
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--dark-text);
      transition: var(--transition);
    }

    .model-chip:hover {
      background: var(--primary-color);
      color: #ffffff;
      border-color: var(--primary-color);
      transform: scale(1.05);
    }

    .img-showcase-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

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

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

    .showcase-img-wrap {
      width: 100%;
      height: 240px;
      overflow: hidden;
      background: #eef2f9;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .showcase-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .showcase-item:hover .showcase-img-wrap img {
      transform: scale(1.04);
    }

    .showcase-body {
      padding: 20px;
    }

    .showcase-body h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .banner-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 30px;
    }

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

    .banner-card img {
      width: 100%;
      height: 160px;
      object-fit: cover;
    }

    .banner-card-info {
      padding: 14px;
      font-size: 0.9rem;
      font-weight: 700;
      text-align: center;
      color: var(--dark-text);
    }

    .comparison-table-wrapper {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .comp-table th, .comp-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }

    .comp-table th {
      background: #fafbfd;
      font-weight: 800;
      color: var(--dark-text);
    }

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

    .comp-score-box {
      background: linear-gradient(135deg, #fff0f6, #fff7ed);
      border: 1px solid #ffd4e5;
      padding: 24px;
      border-radius: var(--radius-md);
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }

    .score-left h3 {
      font-size: 1.3rem;
      color: var(--primary-color);
      margin-bottom: 4px;
    }

    .score-stars {
      color: #ff9900;
      font-size: 1.2rem;
    }

    .score-right {
      display: flex;
      align-items: baseline;
      gap: 6px;
    }

    .score-num {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--primary-color);
      line-height: 1;
    }

    .score-total {
      font-size: 1.1rem;
      color: var(--light-text);
      font-weight: 700;
    }

    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

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

    .step-num {
      font-size: 2rem;
      font-weight: 900;
      color: #e5ebf8;
      line-height: 1;
      margin-bottom: 14px;
    }

    .step-card h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 920px;
      margin: 0 auto;
    }

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

    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--dark-text);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--primary-color);
      transition: transform 0.28s ease;
    }

    .faq-answer {
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--sub-text);
      display: none;
      line-height: 1.7;
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

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

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

    .testi-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
    }

    .testi-content {
      font-size: 0.95rem;
      color: var(--sub-text);
      font-style: italic;
      margin-bottom: 20px;
      line-height: 1.6;
    }

    .testi-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .testi-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
    }

    .testi-meta h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--dark-text);
    }

    .testi-meta span {
      font-size: 0.8rem;
      color: var(--light-text);
    }

    .form-section-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 44px;
      box-shadow: var(--shadow-sm);
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .form-group.full-width {
      grid-column: span 2;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--dark-text);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #ced6e5;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--dark-text);
      outline: none;
      transition: var(--transition);
      background: #fdfdfe;
    }

    .form-control:focus {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(255, 42, 133, 0.15);
      background: #ffffff;
    }

    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }

    .articles-list {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-bottom: 30px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }

    .article-item:hover {
      transform: translateY(-3px);
      border-color: var(--border-bright);
      box-shadow: var(--shadow-hover);
    }

    .article-item h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--dark-text);
    }

    .article-link {
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--primary-color);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .links-block {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .links-block a {
      font-size: 0.9rem;
      color: var(--sub-text);
      background: var(--bg-alt);
      padding: 6px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid #e1e7f2;
    }

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

    .site-footer {
      background-color: #0f121d;
      color: #a2a8ba;
      padding-top: 60px;
      padding-bottom: 36px;
      border-top: 1px solid #23283a;
    }

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

    .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;
      color: #8b92a5;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links-list li a {
      color: #8b92a5;
      font-size: 0.88rem;
    }

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

    .footer-qrcode {
      display: flex;
      flex-direction: column;
      gap: 10px;
      align-items: flex-start;
    }

    .footer-qrcode img {
      width: 100px;
      height: 100px;
      border-radius: 8px;
      background: #ffffff;
      padding: 4px;
    }

    .footer-bottom {
      border-top: 1px solid #202638;
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 0.85rem;
      color: #71778c;
    }

    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: 0 4px 18px rgba(0,0,0,0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      cursor: pointer;
      border: 1px solid var(--border-color);
      transition: var(--transition);
      color: var(--dark-text);
    }

    .floating-btn:hover {
      background: var(--primary-color);
      color: #ffffff;
      transform: translateY(-3px);
    }

    @media (max-width: 992px) {
      .hero-h1 { font-size: 2.2rem; }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .banner-row { grid-template-columns: repeat(2, 1fr); }
      .steps-grid { grid-template-columns: repeat(2, 1fr); }
      .testimonials-grid { grid-template-columns: repeat(1, 1fr); }
      .articles-list { grid-template-columns: repeat(1, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .nav-links { display: none; }
      .nav-toggle { display: block; }
      .nav-active {
        display: flex !important;
        flex-direction: column;
        position: absolute;
        top: 74px;
        left: 0;
        width: 100%;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.08);
      }
      .nav-active li a { width: 100%; padding: 10px 14px; }
    }

    @media (max-width: 640px) {
      .section-padding { padding-top: 50px; padding-bottom: 50px; }
      .section-title { font-size: 1.7rem; }
      .hero-h1 { font-size: 1.8rem; }
      .hero-stats-grid { grid-template-columns: 1fr; }
      .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
      .img-showcase-grid { grid-template-columns: 1fr; }
      .banner-row { grid-template-columns: 1fr; }
      .steps-grid { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .form-group.full-width { grid-column: span 1; }
      .footer-grid { grid-template-columns: 1fr; }
      .form-section-wrapper { padding: 24px; }
    }