:root {
      --primary: #1255e6;
      --primary-hover: #0c43ba;
      --secondary: #00b4d8;
      --dark: #0f172a;
      --dark-light: #1e293b;
      --body-color: #334155;
      --muted: #64748b;
      --light-bg: #f8faff;
      --card-bg: #ffffff;
      --border-color: #e2e8f0;
      --accent: #2563eb;
      --success: #10b981;
      --shadow-sm: 0 2px 8px rgba(18, 85, 230, 0.06);
      --shadow-md: 0 10px 25px -5px rgba(18, 85, 230, 0.1);
      --shadow-lg: 0 20px 35px -10px rgba(15, 23, 42, 0.12);
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    * {
      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;
      line-height: 1.6;
      color: var(--body-color);
      background-color: var(--light-bg);
      background-image: 
        radial-gradient(circle at 10% 20%, rgba(18, 85, 230, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 180, 216, 0.04) 0%, transparent 40%);
      background-attachment: fixed;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      display: block;
      max-width: 100%;
      height: auto;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .section {
      padding: 90px 0;
      position: relative;
    }
    .section-alt {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 55px auto;
    }
    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      background: rgba(18, 85, 230, 0.08);
      color: var(--primary);
      font-size: 0.875rem;
      font-weight: 600;
      border-radius: 9999px;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 2.25rem;
      color: var(--dark);
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--muted);
      line-height: 1.7;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 13px 28px;
      font-size: 1rem;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      gap: 8px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #0d47a1 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(18, 85, 230, 0.35);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #0c43ba 0%, #0a3880 100%);
      box-shadow: 0 6px 20px rgba(18, 85, 230, 0.45);
      transform: translateY(-2px);
      color: #ffffff;
    }
    .btn-secondary {
      background: #ffffff;
      color: var(--dark);
      border-color: var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      height: 74px;
      display: flex;
      align-items: center;
    }
    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      height: 48px;
    }
    .ai-page-logo {
      max-height: 42px;
      width: auto;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-item a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--dark-light);
      padding: 8px 14px;
      border-radius: 6px;
      display: block;
    }
    .nav-item a:hover {
      color: var(--primary);
      background-color: rgba(18, 85, 230, 0.05);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      padding: 8px;
      cursor: pointer;
      color: var(--dark);
    }
    .mobile-menu-toggle svg {
      width: 24px;
      height: 24px;
      fill: currentColor;
    }
    .hero-section {
      padding: 100px 0 80px;
      background: linear-gradient(180deg, #edf4ff 0%, #f8faff 100%);
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid rgba(18, 85, 230, 0.08);
    }
    .hero-section::before {
      content: "";
      position: absolute;
      top: -120px;
      right: -100px;
      width: 480px;
      height: 480px;
      background: radial-gradient(circle, rgba(18, 85, 230, 0.15) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero-content {
      text-align: center;
      max-width: 880px;
      margin: 0 auto;
    }
    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      padding: 8px 20px;
      border-radius: 9999px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary);
      border: 1px solid rgba(18, 85, 230, 0.2);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }
    .hero-tag-pulse {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 0 rgba(18, 85, 230, 0.4);
      animation: pulse 1.8s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(18, 85, 230, 0.6); }
      70% { box-shadow: 0 0 0 10px rgba(18, 85, 230, 0); }
      100% { box-shadow: 0 0 0 0 rgba(18, 85, 230, 0); }
    }
    .hero-title {
      font-size: 3.2rem;
      font-weight: 900;
      color: var(--dark);
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -1px;
    }
    .hero-title span {
      background: linear-gradient(135deg, var(--primary) 0%, #00a8e8 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 1.25rem;
      color: var(--muted);
      line-height: 1.7;
      margin-bottom: 38px;
      max-width: 720px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-btn-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }
    .metric-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(18, 85, 230, 0.3);
    }
    .metric-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .metric-label {
      font-size: 0.9rem;
      color: var(--muted);
      font-weight: 500;
    }
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 30px;
    }
    .model-pill {
      background: rgba(255, 255, 255, 0.85);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      color: var(--dark-light);
      font-weight: 500;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .card {
      background: var(--card-bg);
      border-radius: 14px;
      border: 1px solid var(--border-color);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-5px);
      border-color: rgba(18, 85, 230, 0.3);
    }
    .card-icon {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: rgba(18, 85, 230, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      margin-bottom: 22px;
      font-weight: 700;
    }
    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 12px;
    }
    .card-text {
      font-size: 0.95rem;
      color: var(--muted);
      line-height: 1.65;
      margin-bottom: 20px;
      flex-grow: 1;
    }
    .card-list {
      list-style: none;
      margin-top: auto;
      padding-top: 16px;
      border-top: 1px dashed var(--border-color);
    }
    .card-list li {
      font-size: 0.875rem;
      color: var(--body-color);
      margin-bottom: 8px;
      position: relative;
      padding-left: 18px;
    }
    .card-list li::before {
      content: "•";
      color: var(--primary);
      font-size: 1.2rem;
      position: absolute;
      left: 0;
      top: -2px;
    }
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .process-step {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 28px 24px;
      position: relative;
      transition: var(--transition);
    }
    .process-step:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .process-num {
      display: inline-block;
      width: 36px;
      height: 36px;
      line-height: 36px;
      text-align: center;
      background: var(--primary);
      color: #ffffff;
      font-weight: 700;
      border-radius: 8px;
      margin-bottom: 18px;
      font-size: 1.1rem;
    }
    .process-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 10px;
    }
    .process-desc {
      font-size: 0.9rem;
      color: var(--muted);
      line-height: 1.6;
    }
    .compare-container {
      background: #ffffff;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }
    .compare-table th, .compare-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background: #f1f5f9;
      color: var(--dark);
      font-weight: 700;
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .compare-table .highlight-col {
      background: rgba(18, 85, 230, 0.03);
      font-weight: 600;
      color: var(--primary);
    }
    .score-badge {
      display: inline-block;
      padding: 4px 10px;
      background: #fef3c7;
      color: #b45309;
      border-radius: 6px;
      font-weight: 700;
      font-size: 0.9rem;
    }
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 26px;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
    }
    .review-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 16px;
    }
    .reviewer-info h4 {
      font-size: 1rem;
      color: var(--dark);
      font-weight: 700;
    }
    .reviewer-info p {
      font-size: 0.8rem;
      color: var(--muted);
    }
    .review-stars {
      color: #f59e0b;
      font-size: 0.9rem;
    }
    .review-body {
      font-size: 0.92rem;
      color: var(--body-color);
      line-height: 1.65;
    }
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-icon {
      font-size: 1.4rem;
      font-weight: 300;
      color: var(--primary);
      transition: transform 0.3s ease;
      line-height: 1;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
      background: #fafcff;
    }
    .faq-answer-inner {
      padding: 0 24px 22px 24px;
      font-size: 0.95rem;
      color: var(--muted);
      line-height: 1.7;
      border-top: 1px dashed rgba(226, 232, 240, 0.7);
      padding-top: 16px;
    }
    .form-wrapper {
      background: #ffffff;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      background: #ffffff;
      color: var(--dark);
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(18, 85, 230, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }
    .media-card {
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-img-wrap {
      width: 100%;
      background: #f1f5f9;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .media-img-wrap img {
      width: 100%;
      height: auto;
      object-fit: contain;
    }
    .media-content {
      padding: 24px;
    }
    .media-content h4 {
      font-size: 1.15rem;
      color: var(--dark);
      margin-bottom: 8px;
      font-weight: 700;
    }
    .media-content p {
      font-size: 0.9rem;
      color: var(--muted);
      line-height: 1.6;
    }
    .article-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 16px 20px;
      border-radius: 8px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
    }
    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }
    .article-title {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--dark-light);
    }
    .article-link {
      font-size: 0.85rem;
      color: var(--primary);
      font-weight: 600;
      white-space: nowrap;
      margin-left: 16px;
    }
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h3 {
      font-size: 1.3rem;
      color: #ffffff;
      margin-bottom: 14px;
    }
    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .footer-qr {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .footer-qr img {
      width: 90px;
      height: 90px;
      background: #ffffff;
      padding: 4px;
      border-radius: 6px;
    }
    .footer-qr-text {
      font-size: 0.85rem;
      color: #cbd5e1;
    }
    .footer-title {
      font-size: 1rem;
      color: #ffffff;
      font-weight: 600;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: #94a3b8;
      font-size: 0.9rem;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }
    .friend-links a {
      color: #64748b;
      font-size: 0.85rem;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
    }
    .friend-links a:hover {
      color: #ffffff;
      background: #334155;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
    }
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      transition: var(--transition);
      text-decoration: none;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }
    .float-btn svg {
      width: 22px;
      height: 22px;
      fill: currentColor;
    }
    @media (max-width: 992px) {
      .hero-title { font-size: 2.5rem; }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .process-timeline { grid-template-columns: repeat(2, 1fr); }
      .review-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .mobile-menu-toggle { display: block; }
      .nav-actions { display: none; }
      .hero-title { font-size: 2rem; }
      .section { padding: 60px 0; }
      .grid-3, .grid-2, .review-grid, .process-timeline { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; gap: 10px; text-align: center; }
    }