/* Reset & Base Variables */
    :root {
      --primary-color: #059669;
      --primary-hover: #047857;
      --primary-light: #ecfdf5;
      --primary-focus: #10b981;
      --accent-neon: #00d084;
      --accent-lime: #84cc16;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --bg-subtle: #f0fdf4;
      --border-color: #e2e8f0;
      --border-green: #bbf7d0;
      --card-shadow: 0 4px 20px -2px rgba(5, 150, 105, 0.08), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
      --card-shadow-hover: 0 12px 30px -4px rgba(5, 150, 105, 0.16), 0 4px 12px -2px rgba(0, 0, 0, 0.06);
      --max-width: 1200px;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --transition-base: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-page);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-page);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a:hover {
      color: var(--primary-hover);
    }

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

    /* Top Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-green);
      box-shadow: 0 2px 10px rgba(5, 150, 105, 0.05);
    }

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

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

    .logo-container {
      display: flex;
      align-items: center;
      max-height: 42px;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-tagline {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary-color);
      background: var(--primary-light);
      padding: 3px 8px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-green);
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.93rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition-base);
      white-space: nowrap;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-color), var(--accent-neon));
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(5, 150, 105, 0.25);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover), var(--primary-color));
      color: #ffffff;
      box-shadow: 0 6px 16px rgba(5, 150, 105, 0.35);
      transform: translateY(-1px);
    }

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

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

    .btn-lg {
      padding: 14px 28px;
      font-size: 1.05rem;
      border-radius: var(--radius-md);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 8px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* Hero Section - STRICTLY NO IMAGES */
    .hero-section {
      position: relative;
      padding: 70px 0 60px;
      background: radial-gradient(120% 100% at 50% 0%, #dcfce7 0%, #f0fdf4 50%, #f8fafc 100%);
      border-bottom: 1px solid var(--border-green);
      overflow: hidden;
    }

    .hero-wrapper {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid var(--border-green);
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary-color);
      box-shadow: 0 2px 8px rgba(5, 150, 105, 0.08);
      margin-bottom: 24px;
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent-neon);
      border-radius: 50%;
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.95); opacity: 0.8; }
      50% { transform: scale(1.3); opacity: 1; }
      100% { transform: scale(0.95); opacity: 0.8; }
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 18px;
      letter-spacing: -0.02em;
    }

    .hero-title span {
      color: var(--primary-color);
    }

    .hero-lead {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 32px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }

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

    .metric-card {
      background: #ffffff;
      padding: 16px 12px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-green);
      box-shadow: var(--card-shadow);
      text-align: center;
      transition: var(--transition-base);
    }

    .metric-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--card-shadow-hover);
    }

    .metric-number {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary-color);
      display: block;
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.82rem;
      color: var(--text-light);
      font-weight: 500;
    }

    /* Section Structure */
    .section-block {
      padding: 68px 0;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .section-block:nth-child(even) {
      background-color: var(--bg-subtle);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 44px;
    }

    .section-tag {
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--primary-color);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: 9999px;
      display: inline-block;
      margin-bottom: 10px;
      border: 1px solid var(--border-green);
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* Feature & Service Grid */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

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

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

    .feature-card:hover {
      border-color: var(--border-green);
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }

    .card-icon-pill {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: var(--primary-light);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: bold;
      margin-bottom: 16px;
      border: 1px solid var(--border-green);
    }

    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .card-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .tag-chip {
      font-size: 0.75rem;
      padding: 2px 8px;
      background: var(--bg-page);
      border-radius: 4px;
      color: var(--text-light);
      border: 1px solid var(--border-color);
    }

    /* Model Logos Marquee / Cloud */
    .model-badge-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-chip {
      background: #ffffff;
      padding: 8px 16px;
      border-radius: 9999px;
      border: 1px solid var(--border-color);
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 1px 4px rgba(0,0,0,0.03);
      transition: var(--transition-base);
    }

    .model-chip:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      background: var(--primary-light);
      transform: scale(1.04);
    }

    /* Process Flow */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

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

    .step-badge {
      font-size: 0.85rem;
      font-weight: 800;
      color: var(--primary-color);
      background: var(--primary-light);
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      margin-bottom: 12px;
      border: 1px solid var(--border-green);
    }

    /* Review & Comparison Table */
    .comparison-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-green);
      box-shadow: var(--card-shadow);
      overflow: hidden;
      margin-top: 24px;
    }

    .rating-banner {
      background: linear-gradient(135deg, #064e3b, #059669);
      color: #ffffff;
      padding: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }

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

    .score-big {
      font-size: 2.8rem;
      font-weight: 800;
      color: #fef08a;
      line-height: 1;
    }

    .stars-icon {
      color: #facc15;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

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

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.94rem;
    }

    .custom-table th {
      background: var(--bg-subtle);
      color: var(--text-main);
      font-weight: 700;
    }

    .custom-table td.highlight {
      background: #f0fdf4;
      font-weight: 600;
      color: var(--primary-color);
    }

    /* Media Showcase Images */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
    }

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

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

    .media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition-base);
    }

    .media-card:hover .media-img-wrap img {
      transform: scale(1.03);
    }

    .media-content {
      padding: 16px 20px;
    }

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

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

    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
    }

    .reviewer-avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
      border: 1px solid var(--border-green);
    }

    /* FAQ Accordion */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-item.active {
      border-color: var(--primary-color);
      box-shadow: 0 4px 16px rgba(5, 150, 105, 0.08);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 1.25rem;
      font-weight: bold;
      color: var(--primary-color);
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: var(--bg-subtle);
    }

    .faq-answer-inner {
      padding: 0 24px 20px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Contact & Form Section */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      align-items: start;
    }

    .contact-info-panel {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--border-green);
      box-shadow: var(--card-shadow);
    }

    .contact-qr-wrapper {
      text-align: center;
      margin-bottom: 24px;
      padding: 20px;
      background: var(--primary-light);
      border-radius: var(--radius-md);
      border: 1px dashed var(--primary-color);
    }

    .contact-qr-wrapper img {
      max-width: 160px;
      height: auto;
      border-radius: var(--radius-sm);
      display: block;
      margin: 0 auto 10px;
    }

    .contact-details-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .contact-details-list li {
      font-size: 0.95rem;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .form-panel {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .form-group {
      margin-bottom: 20px;
    }

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

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      color: var(--text-main);
      background: var(--bg-page);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      transition: var(--transition-base);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-color);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
    }

    textarea.form-control {
      min-height: 100px;
      resize: vertical;
    }

    /* Articles Section */
    .article-list-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-item-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 20px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-item-card:hover {
      border-color: var(--border-green);
      transform: translateY(-2px);
    }

    /* Footer */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-green);
      padding: 48px 0 24px;
      margin-top: 40px;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 36px;
    }

    .footer-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-top: 12px;
      max-width: 360px;
    }

    .footer-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

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

    .footer-links-list a {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    .footer-links-list a:hover {
      color: var(--primary-color);
    }

    .friend-links-box {
      border-top: 1px solid var(--border-color);
      padding: 20px 0;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .friend-links-title {
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .friend-links-box a {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .friend-links-box a:hover {
      color: var(--primary-color);
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* Floating Utilities */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .tool-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary-color);
      border: 1px solid var(--border-green);
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.1rem;
      transition: var(--transition-base);
    }

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

    /* Responsive Queries */
    @media (max-width: 992px) {
      .hero-title { font-size: 2rem; }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .process-timeline { grid-template-columns: repeat(2, 1fr); }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
      .review-grid { grid-template-columns: repeat(2, 1fr); }
      .contact-layout { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: 1fr 1fr; }
      
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        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 { width: 100%; padding: 12px 16px; }
      .mobile-menu-toggle { display: block; }
    }

    @media (max-width: 640px) {
      .hero-title { font-size: 1.65rem; }
      .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
      .process-timeline { grid-template-columns: 1fr; }
      .hero-metrics { grid-template-columns: 1fr; }
      .review-grid { grid-template-columns: 1fr; }
      .article-list-grid { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: 1fr; }
      .hero-actions { flex-direction: column; }
      .btn-lg { width: 100%; }
    }