:root {
      --primary: #0052ff;
      --primary-hover: #003ebd;
      --primary-light: #eef4ff;
      --accent: #00b4d8;
      --accent-warm: #ff6b35;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --text-light: #94a3b8;
      --bg-main: #f8faff;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --border: #e2e8f0;
      --border-focus: #bfdbfe;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.07);
      --shadow-lg: 0 16px 36px rgba(0, 82, 255, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --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, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

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

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

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

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

    .brand-area .logo-wrapper {
      width: 130px;
      display: flex;
      align-items: center;
    }

    .brand-area .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 22px;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #0070f3 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(0, 82, 255, 0.3);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, #0056bd 100%);
      transform: translateY(-2px);
      box-shadow: var(--shadow-lg);
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--primary);
      border-color: #bfdbfe;
    }

    .btn-secondary:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .btn-accent {
      background: linear-gradient(135deg, #ff7e40 0%, #ff542e 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(255, 84, 46, 0.28);
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255, 84, 46, 0.35);
    }

    .btn-sm {
      padding: 6px 14px;
      font-size: 0.85rem;
      border-radius: var(--radius-sm);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-size: 1.1rem;
      color: var(--text-main);
    }

    .section {
      padding: 80px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-alt);
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 52px;
    }

    .section-tag {
      display: inline-block;
      padding: 5px 14px;
      background: var(--primary-light);
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: 999px;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .hero-section {
      background: linear-gradient(180deg, #eaf2ff 0%, #f8faff 100%);
      padding: 90px 0 70px;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border);
    }

    .hero-section::before {
      content: "";
      position: absolute;
      top: -80px;
      left: 50%;
      transform: translateX(-50%);
      width: 800px;
      height: 380px;
      background: radial-gradient(circle, rgba(0, 180, 216, 0.18) 0%, rgba(0, 82, 255, 0.04) 60%, transparent 80%);
      pointer-events: none;
    }

    .hero-content {
      text-align: center;
      max-width: 880px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid #bfdbfe;
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: #475569;
      line-height: 1.7;
      margin-bottom: 34px;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 44px;
    }

    .hero-actions .btn {
      padding: 14px 34px;
      font-size: 1.05rem;
    }

    .hero-highlights {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .highlight-box {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

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

    .highlight-num {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .highlight-txt {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .models-marquee-wrap {
      margin-top: 40px;
      padding-top: 28px;
      border-top: 1px dashed #cbd5e1;
    }

    .models-marquee-title {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-muted);
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .model-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }

    .model-tag {
      padding: 4px 12px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 0.8rem;
      font-weight: 600;
      color: #334155;
    }

    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .intro-text h3 {
      font-size: 1.6rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .intro-text p {
      font-size: 1rem;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.7;
    }

    .intro-feature-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .intro-feature-item {
      display: flex;
      align-items: flex-start;
      gap: 10px;
    }

    .check-icon {
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: #22c55e;
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
      flex-shrink: 0;
      margin-top: 3px;
    }

    .intro-media-box {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 16px;
      box-shadow: var(--shadow-md);
    }

    .intro-media-box img {
      width: 100%;
      border-radius: var(--radius-md);
      display: block;
    }

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

    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-color: #bfdbfe;
    }

    .service-card-top {
      margin-bottom: 20px;
    }

    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 16px;
    }

    .service-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .service-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .service-meta {
      padding-top: 16px;
      border-top: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.85rem;
      color: var(--primary);
      font-weight: 600;
    }

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

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

    .step-number {
      font-size: 2rem;
      font-weight: 900;
      color: #cbd5e1;
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-card h3 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

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

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

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

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16/9;
      background: #e2e8f0;
      overflow: hidden;
    }

    .case-img-wrap.square {
      aspect-ratio: 1/1;
    }

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

    .case-card:hover .case-img-wrap img {
      transform: scale(1.04);
    }

    .case-info {
      padding: 20px;
    }

    .case-info h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .case-info p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .eval-container {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .eval-score-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 2px solid var(--bg-alt);
      margin-bottom: 28px;
    }

    .eval-score-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-badge {
      font-size: 2.6rem;
      font-weight: 900;
      color: var(--accent-warm);
      line-height: 1;
      padding: 12px 20px;
      background: #fff5f0;
      border: 2px solid #fed7aa;
      border-radius: var(--radius-md);
    }

    .score-detail h3 {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .score-detail p {
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    .eval-stars {
      color: #ffb703;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

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

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
      font-size: 0.92rem;
    }

    .eval-table th {
      background: var(--bg-alt);
      font-weight: 700;
      color: #334155;
    }

    .eval-table tr:hover td {
      background: #f8faff;
    }

    .eval-table .highlight-col {
      background: #f0f7ff;
      font-weight: 600;
      color: var(--primary);
    }

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

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

    .review-text {
      font-size: 0.92rem;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 20px;
      position: relative;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      padding-top: 14px;
      border-top: 1px solid var(--border);
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .author-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-info p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .contact-form-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-panel {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-info-panel h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 14px;
    }

    .contact-info-panel p {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 28px;
    }

    .qr-card {
      background: var(--bg-alt);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 20px;
      text-align: center;
      max-width: 240px;
      margin-bottom: 24px;
    }

    .qr-card img {
      width: 160px;
      height: 160px;
      object-fit: contain;
      margin: 0 auto 10px;
      display: block;
      border-radius: var(--radius-sm);
    }

    .qr-card span {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .contact-list-items {
      font-size: 0.9rem;
      color: var(--text-muted);
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .contact-list-items strong {
      color: var(--text-main);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

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

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 82, 255, 0.12);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    .faq-accordion {
      max-width: 920px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-size: 1.02rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
      color: var(--text-main);
    }

    .faq-question:hover {
      background: #f8faff;
      color: var(--primary);
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--text-muted);
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid transparent;
    }

    .faq-item.active {
      border-color: #bfdbfe;
      box-shadow: var(--shadow-sm);
    }

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

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

    .faq-item.active .faq-answer {
      display: block;
      border-top-color: #f1f5f9;
    }

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

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

    .article-card h3 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
      line-height: 1.4;
    }

    .article-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-bottom: 16px;
    }

    .article-links-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding-top: 16px;
      border-top: 1px dashed var(--border);
    }

    .article-links-row a {
      font-size: 0.85rem;
      color: var(--primary);
      background: var(--primary-light);
      padding: 6px 12px;
      border-radius: 6px;
    }

    .article-links-row a:hover {
      background: #dbeafe;
    }

    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 24px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      padding-bottom: 40px;
      border-bottom: 1px solid #1e293b;
      margin-bottom: 28px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      color: #94a3b8;
      font-size: 0.9rem;
    }

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

    .friend-links-area {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
      padding: 16px 0;
      border-bottom: 1px solid #1e293b;
      margin-bottom: 20px;
    }

    .friend-links-title {
      font-size: 0.9rem;
      font-weight: 700;
      color: #cbd5e1;
    }

    .friend-links-area a {
      font-size: 0.85rem;
      color: #94a3b8;
      padding: 3px 8px;
      background: #1e293b;
      border-radius: 4px;
    }

    .friend-links-area a:hover {
      color: #ffffff;
      background: #334155;
    }

    .footer-bottom {
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    .float-tools {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: 0 6px 18px rgba(0,0,0,0.15);
      border: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--text-main);
      font-size: 1.1rem;
      transition: var(--transition);
      text-decoration: none;
    }

    .float-btn:hover {
      transform: scale(1.08);
      background: var(--primary);
      color: #ffffff;
    }

    @media (max-width: 1024px) {
      .services-grid, .cases-grid, .reviews-grid, .articles-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-highlights {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .header-nav .container {
        position: relative;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-actions {
        display: none;
      }
      .hero-title {
        font-size: 1.95rem;
      }
      .intro-grid, .contact-form-layout {
        grid-template-columns: 1fr;
      }
      .services-grid, .cases-grid, .reviews-grid, .articles-grid, .steps-grid, .intro-feature-list {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .eval-score-header {
        flex-direction: column;
        align-items: flex-start;
      }
    }