* { margin: 0; padding: 0; box-sizing: border-box; }
    :root {
      --primary: #1a3fb8;
      --primary-light: #3d6be5;
      --primary-soft: #eef3ff;
      --primary-glow: rgba(26,63,184,0.18);
      --bg: #f5f8ff;
      --card-bg: #ffffff;
      --text-dark: #0d1b33;
      --text-main: #253c66;
      --text-muted: #5e7191;
      --border-light: #d9e2f5;
      --shadow-sm: 0 6px 20px rgba(26,63,184,0.06);
      --shadow-md: 0 14px 36px rgba(26,63,184,0.10);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --container: 1200px;
    }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Inter','Segoe UI','PingFang SC','Microsoft YaHei',system-ui,-apple-system,sans-serif;
      background: var(--bg);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    a { text-decoration: none; color: inherit; }
    ul { list-style: none; }
    img { max-width: 100%; height: auto; display: block; }
    .container {
      width: 100%;
      max-width: var(--container);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-dark);
      letter-spacing: -0.02em;
      margin-bottom: 12px;
    }
    .section-sub {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 640px;
      margin-bottom: 48px;
    }
    .text-center { text-align: center; }
    .text-center .section-sub { margin-left: auto; margin-right: auto; }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 12px 28px;
      border-radius: 60px;
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 8px 20px rgba(26,63,184,0.25);
    }
    .btn-primary:hover {
      background: #14319e;
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(26,63,184,0.35);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary-soft);
      transform: translateY(-2px);
    }
    .btn-soft {
      background: #fff;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .btn-soft:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      padding: 28px;
      transition: all 0.3s ease;
      border: 1px solid rgba(217,226,245,0.6);
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .tag {
      display: inline-block;
      padding: 4px 14px;
      border-radius: 40px;
      font-size: 0.8rem;
      font-weight: 600;
      background: var(--primary-soft);
      color: var(--primary);
      white-space: nowrap;
    }
    .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
    .grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 28px; }
    .grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
    .fade-up {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .fade-up.visible { opacity: 1; transform: translateY(0); }

    /* Header */
    .site-header {
      background: rgba(255,255,255,0.86);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(217,226,245,0.8);
      position: sticky;
      top: 0;
      z-index: 100;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 70px;
      gap: 24px;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }
    .brand img {
      height: 36px;
      width: auto;
      max-width: 140px;
      object-fit: contain;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 12px;
      border-radius: 8px;
      transition: all 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--primary);
      background: var(--primary-soft);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1.5px solid var(--border-light);
      border-radius: 10px;
      padding: 8px 10px;
      cursor: pointer;
      color: var(--text-dark);
      font-size: 1.2rem;
      line-height: 1;
    }
    .header-cta {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }
    .header-cta .btn {
      padding: 8px 20px;
      font-size: 0.88rem;
    }

    /* Hero */
    .hero {
      position: relative;
      padding: 80px 0 70px;
      background: linear-gradient(145deg, #edf3ff 0%, #f8fbff 40%, #eaf0ff 100%);
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -30%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(61,107,229,0.12) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero::after {
      content: '';
      position: absolute;
      bottom: -20%;
      left: -8%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(26,63,184,0.08) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1.2;
      color: var(--text-dark);
      letter-spacing: -0.03em;
      margin-bottom: 20px;
    }
    .hero-left h1 span {
      color: var(--primary);
    }
    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 28px;
      max-width: 520px;
    }
    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }
    .hero-visual {
      position: relative;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .metric-card {
      background: #fff;
      border-radius: var(--radius-md);
      padding: 20px 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(217,226,245,0.8);
      display: flex;
      align-items: center;
      gap: 16px;
      transition: all 0.3s ease;
      animation: floatCard 6s ease-in-out infinite;
    }
    .metric-card:nth-child(2) { animation-delay: 1s; }
    .metric-card:nth-child(3) { animation-delay: 2s; }
    .metric-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
    .metric-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      background: var(--primary-soft);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      flex-shrink: 0;
    }
    .metric-info strong {
      display: block;
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-dark);
    }
    .metric-info span {
      font-size: 0.82rem;
      color: var(--text-muted);
    }
    @keyframes floatCard {
      0%,100% { transform: translateY(0); }
      50% { transform: translateY(-5px); }
    }

    /* About */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: start;
    }
    .about-text h2 {
      font-size: 1.9rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }
    .about-text p {
      color: var(--text-muted);
      margin-bottom: 16px;
    }
    .about-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-top: 24px;
    }
    .about-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-main);
    }
    .about-list li::before {
      content: '✓';
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 20px;
      height: 20px;
      background: var(--primary-soft);
      color: var(--primary);
      border-radius: 50%;
      font-size: 0.7rem;
      font-weight: 700;
      flex-shrink: 0;
    }
    .platform-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 24px;
    }

    /* Services */
    .service-card {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .service-card .icon-box {
      width: 48px;
      height: 48px;
      border-radius: 14px;
      background: linear-gradient(135deg, var(--primary-light), var(--primary));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
    }
    .service-card h3 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-dark);
    }
    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Process */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 20px;
      counter-reset: step;
    }
    .step-item {
      position: relative;
      background: #fff;
      border-radius: var(--radius-md);
      padding: 28px 22px;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(217,226,245,0.6);
      transition: all 0.3s;
    }
    .step-item:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
    .step-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-soft);
      margin-bottom: 8px;
      line-height: 1;
    }
    .step-item h3 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 6px;
    }
    .step-item p {
      font-size: 0.86rem;
      color: var(--text-muted);
    }

    /* Compare Table */
    .compare-table-wrap {
      overflow-x: auto;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      background: #fff;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 700px;
      font-size: 0.9rem;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      text-align: left;
      border-bottom: 1px solid var(--border-light);
    }
    .compare-table th {
      background: var(--primary-soft);
      color: var(--primary);
      font-weight: 700;
      font-size: 0.85rem;
    }
    .compare-table tr:last-child td { border-bottom: none; }
    .compare-table td:first-child {
      font-weight: 600;
      color: var(--text-dark);
    }
    .rating-stars {
      color: #f5a623;
      letter-spacing: 2px;
      font-size: 1rem;
    }
    .score-badge {
      display: inline-block;
      background: var(--primary);
      color: #fff;
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 40px;
      font-size: 0.9rem;
    }

    /* Reviews */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .review-card {
      background: #fff;
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(217,226,245,0.6);
      transition: all 0.3s;
    }
    .review-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
    .review-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-soft);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
      font-size: 1rem;
      flex-shrink: 0;
    }
    .review-header strong {
      display: block;
      font-size: 0.92rem;
      color: var(--text-dark);
    }
    .review-header span {
      font-size: 0.78rem;
      color: var(--text-muted);
    }
    .review-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 880px;
      margin: 0 auto;
    }
    .faq-item {
      background: #fff;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(217,226,245,0.6);
      overflow: hidden;
      transition: box-shadow 0.25s;
    }
    .faq-item:hover { box-shadow: var(--shadow-md); }
    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 24px;
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--text-dark);
      cursor: pointer;
      user-select: none;
      gap: 16px;
    }
    .faq-question::after {
      content: '+';
      font-size: 1.4rem;
      font-weight: 400;
      color: var(--primary);
      transition: transform 0.3s;
      flex-shrink: 0;
    }
    .faq-item.open .faq-question::after {
      content: '−';
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.9rem;
      line-height: 1.7;
    }
    .faq-item.open .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px;
    }

    /* Form */
    .form-section {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 48px;
      box-shadow: var(--shadow-md);
      max-width: 820px;
      margin: 0 auto;
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group.full { grid-column: 1 / -1; }
    .form-group label {
      font-size: 0.86rem;
      font-weight: 600;
      color: var(--text-dark);
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
      font-family: inherit;
      font-size: 0.94rem;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1.5px solid var(--border-light);
      background: #fafcff;
      color: var(--text-dark);
      transition: border-color 0.2s;
      outline: none;
      width: 100%;
    }
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--primary);
      background: #fff;
      box-shadow: 0 0 0 3px var(--primary-glow);
    }
    .form-group textarea { resize: vertical; min-height: 100px; }

    /* Articles */
    .article-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .article-card {
      background: #fff;
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(217,226,245,0.6);
      display: flex;
      flex-direction: column;
      gap: 12px;
      transition: all 0.3s;
    }
    .article-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
    .article-card h3 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.4;
    }
    .article-card p {
      font-size: 0.86rem;
      color: var(--text-muted);
    }
    .article-card .read-more {
      font-size: 0.86rem;
      font-weight: 600;
      color: var(--primary);
      margin-top: auto;
    }

    /* Footer */
    .site-footer {
      background: #0b1b3d;
      color: #c9d6f5;
      padding: 56px 0 30px;
      margin-top: 60px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h4 {
      color: #fff;
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .footer-brand p {
      font-size: 0.86rem;
      color: #8fa3cc;
      line-height: 1.7;
      max-width: 300px;
    }
    .footer-brand .social-note {
      margin-top: 16px;
      font-size: 0.82rem;
      color: #8fa3cc;
    }
    .footer-col h4 {
      color: #fff;
      font-size: 0.92rem;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-col ul {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-col ul li a {
      font-size: 0.84rem;
      color: #8fa3cc;
      transition: color 0.2s;
    }
    .footer-col ul li a:hover { color: #fff; }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.8rem;
      color: #7a8db5;
    }

    /* Float service */
    .float-kefu {
      position: fixed;
      right: 24px;
      bottom: 90px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
    }
    .float-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 8px 24px rgba(26,63,184,0.35);
      cursor: pointer;
      transition: all 0.25s;
      border: none;
      font-size: 1.2rem;
    }
    .float-btn:hover { transform: translateY(-3px); background: #14319e; }
    .kefu-panel {
      position: absolute;
      right: 64px;
      bottom: 0;
      background: #fff;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      padding: 20px;
      width: 220px;
      display: none;
      text-align: center;
      border: 1px solid var(--border-light);
    }
    .kefu-panel.show { display: block; }
    .kefu-panel img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      margin: 0 auto 10px;
      border-radius: 8px;
    }
    .kefu-panel p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }
    .back-top {
      position: fixed;
      right: 24px;
      bottom: 30px;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #fff;
      color: var(--primary);
      border: 1.5px solid var(--border-light);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: var(--shadow-sm);
      z-index: 98;
      transition: all 0.25s;
      font-size: 1.1rem;
      opacity: 0;
      pointer-events: none;
    }
    .back-top.show { opacity: 1; pointer-events: auto; }
    .back-top:hover { background: var(--primary-soft); transform: translateY(-3px); }

    /* Responsive */
    @media (max-width: 1024px) {
      .hero-content { grid-template-columns: 1fr; gap: 40px; }
      .hero-left h1 { font-size: 2.2rem; }
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      .review-grid { grid-template-columns: repeat(2,1fr); }
      .process-steps { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .about-grid { grid-template-columns: 1fr; }
      .article-grid { grid-template-columns: repeat(2,1fr); }
      .nav-links { display: none; }
      .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        padding: 16px 24px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-light);
        gap: 4px;
        z-index: 99;
      }
      .nav-links.open a { padding: 10px 12px; width: 100%; }
      .mobile-menu-btn { display: block; }
      .header-cta .btn-outline { display: none; }
    }
    @media (max-width: 768px) {
      .section { padding: 56px 0; }
      .section-title { font-size: 1.6rem; }
      .hero { padding: 56px 0 48px; }
      .hero-left h1 { font-size: 1.9rem; }
      .grid-3 { grid-template-columns: 1fr; }
      .grid-4 { grid-template-columns: 1fr 1fr; }
      .review-grid { grid-template-columns: 1fr; }
      .process-steps { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .form-section { padding: 28px; }
      .article-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; gap: 28px; }
      .footer-bottom { flex-direction: column; text-align: center; }
      .hero-actions { flex-direction: column; align-items: stretch; }
      .hero-actions .btn { width: 100%; }
      .float-kefu { right: 16px; bottom: 80px; }
      .kefu-panel { right: 60px; }
      .header-cta .btn { padding: 8px 16px; font-size: 0.8rem; }
    }
    @media (max-width: 480px) {
      .container { padding-left: 16px; padding-right: 16px; }
      .grid-4 { grid-template-columns: 1fr; }
      .about-list { grid-template-columns: 1fr; }
    }