:root {
      --primary: #1254ff;
      --primary-hover: #083ecd;
      --accent: #00d285;
      --accent-warm: #ff5722;
      --bg-page: #f5f8ff;
      --bg-surface: #ffffff;
      --bg-tint: #edf3ff;
      --text-main: #0c1833;
      --text-muted: #53627c;
      --border-color: #dce5f5;
      --shadow-sm: 0 4px 12px rgba(18, 84, 255, 0.05);
      --shadow-md: 0 10px 24px rgba(18, 84, 255, 0.08);
      --shadow-lg: 0 18px 40px rgba(18, 84, 255, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --container-max: 1200px;
    }
    * {
      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-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(18, 84, 255, 0.04);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }
    .brand-meta {
      display: flex;
      flex-direction: column;
    }
    .brand-title {
      font-size: 1.2rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    .brand-sub {
      font-size: 0.72rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover {
      color: var(--primary);
      background-color: var(--bg-tint);
    }
    .header-cta-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.92rem;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary) 0%, #3074ff 100%);
      border-radius: var(--radius-sm);
      box-shadow: 0 4px 14px rgba(18, 84, 255, 0.3);
      border: 1px solid transparent;
      cursor: pointer;
    }
    .btn-main:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, #1254ff 100%);
      box-shadow: 0 6px 18px rgba(18, 84, 255, 0.4);
      transform: translateY(-1px);
    }
    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--primary);
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      cursor: pointer;
    }
    .btn-secondary:hover {
      background: var(--bg-tint);
      border-color: var(--primary);
      color: var(--primary);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .menu-toggle span {
      display: block;
      width: 24px;
      height: 3px;
      background-color: var(--text-main);
      margin: 4px 0;
      border-radius: 2px;
      transition: 0.3s;
    }
    .hero-section {
      padding: 64px 0 54px;
      background: radial-gradient(circle at 50% 0%, #e1ecff 0%, #f5f8ff 70%);
      border-bottom: 1px solid var(--border-color);
      text-align: center;
    }
    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      background: #ffffff;
      padding: 6px 16px;
      border-radius: 99px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      gap: 8px;
    }
    .badge-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent);
    }
    .badge-text {
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .hero-h1 {
      font-size: clamp(2rem, 4vw, 3rem);
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 18px;
      letter-spacing: -0.8px;
    }
    .hero-h1 span {
      background: linear-gradient(135deg, var(--primary) 0%, #0099ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: clamp(1rem, 1.8vw, 1.15rem);
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }
    .hero-cta-box {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .btn-hero-portal {
      font-size: 1.05rem;
      padding: 14px 34px;
      background: linear-gradient(135deg, #ff4d00 0%, #ff7300 100%);
      color: #ffffff;
      font-weight: 800;
      border-radius: var(--radius-md);
      box-shadow: 0 8px 24px rgba(255, 77, 0, 0.35);
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-hero-portal:hover {
      background: linear-gradient(135deg, #e04400 0%, #f06900 100%);
      box-shadow: 0 10px 28px rgba(255, 77, 0, 0.45);
      transform: translateY(-2px);
      color: #ffffff;
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      max-width: 980px;
      margin: 0 auto;
    }
    .stat-pill {
      background: #ffffff;
      padding: 18px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .stat-val {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .stat-lbl {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 600;
    }
    .section-block {
      padding: 72px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--primary);
      background-color: var(--bg-tint);
      border: 1px solid #c9dcff;
      padding: 4px 14px;
      border-radius: 99px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }
    .section-h2 {
      font-size: clamp(1.6rem, 2.8vw, 2.2rem);
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 12px;
    }
    .section-lead {
      font-size: 0.98rem;
      color: var(--text-muted);
    }
    .models-marquee-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .models-chip-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }
    .model-chip {
      background: var(--bg-tint);
      color: var(--text-main);
      padding: 8px 16px;
      border-radius: 99px;
      font-size: 0.85rem;
      font-weight: 600;
      border: 1px solid #d4e3ff;
      display: flex;
      align-items: center;
      gap: 6px;
      transition: 0.2s;
    }
    .model-chip:hover {
      border-color: var(--primary);
      background: #ffffff;
      transform: translateY(-2px);
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }
    .feature-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
    }
    .feature-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
      border-color: #b7d1ff;
    }
    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, var(--bg-tint) 0%, #d8e6ff 100%);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      font-weight: 800;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .feature-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .media-case-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: transform 0.3s ease;
    }
    .media-case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .media-box {
      width: 100%;
      background: #eef3fc;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .media-box.landscape {
      aspect-ratio: 16 / 9;
    }
    .media-box.square {
      aspect-ratio: 1 / 1;
    }
    .media-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .media-info {
      padding: 20px;
      flex-grow: 1;
    }
    .media-info h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .media-info p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .banner-highlight-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 32px;
    }
    .banner-item-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      background: #ffffff;
    }
    .banner-item-wrap .ai-page-image {
      width: 100%;
      height: 240px;
      object-fit: cover;
    }
    .eval-score-card {
      background: linear-gradient(135deg, #ffffff 0%, #edf3ff 100%);
      border: 2px solid #b3cdfc;
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }
    .eval-highlight-box {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }
    .score-badge-val {
      font-size: 3.4rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }
    .score-max-val {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--text-muted);
    }
    .stars-indicator {
      display: inline-flex;
      color: #ff9800;
      font-size: 1.4rem;
      letter-spacing: 2px;
      margin-left: 8px;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }
    .eval-table th {
      background-color: #f7faff;
      color: var(--text-main);
      font-weight: 700;
    }
    .eval-table tr:last-child td {
      border-bottom: none;
    }
    .table-tag-win {
      display: inline-block;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.78rem;
      font-weight: 700;
      background: #e5fbf1;
      color: #05864d;
    }
    .pricing-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 640px;
    }
    .pricing-table th, .pricing-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }
    .pricing-table th {
      background: #f7faff;
      font-weight: 700;
    }
    .price-strike {
      text-decoration: line-through;
      color: #9aa7bc;
      margin-right: 8px;
    }
    .price-hot {
      color: #e63946;
      font-weight: 800;
      font-size: 1.05rem;
    }
    .flow-steps-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }
    .flow-step-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .step-seq {
      width: 32px;
      height: 32px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.9rem;
      margin-bottom: 14px;
    }
    .flow-step-item h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .flow-step-item p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    .user-avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #1254ff 0%, #00d285 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.1rem;
    }
    .user-meta h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .user-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .testimonial-body {
      font-size: 0.9rem;
      color: var(--text-main);
      line-height: 1.65;
    }
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 18px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 700;
      font-size: 1rem;
      user-select: none;
      transition: background-color 0.2s;
    }
    .faq-question:hover {
      background-color: var(--bg-tint);
    }
    .faq-arrow {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
      padding: 0 24px;
      background-color: #fafcff;
      border-top: 1px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 500px;
      transition: max-height 0.35s ease-in-out;
      padding: 16px 24px;
      border-top-color: var(--border-color);
    }
    .faq-answer p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .form-section-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 820px;
      margin: 0 auto;
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }
    .form-group-full {
      grid-column: span 2;
    }
    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.92rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      transition: border-color 0.2s;
      background: #fafcff;
    }
    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(18, 84, 255, 0.12);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }
    .articles-links-box {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 24px;
      margin-top: 24px;
      box-shadow: var(--shadow-sm);
    }
    .articles-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      list-style: none;
    }
    .articles-list li a {
      display: inline-block;
      padding: 8px 16px;
      background: var(--bg-tint);
      border: 1px solid #d0e0fc;
      border-radius: var(--radius-sm);
      font-size: 0.88rem;
      color: var(--primary);
      font-weight: 600;
    }
    .articles-list li a:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }
    .site-footer {
      background-color: #0b1528;
      color: #c0cce0;
      padding: 56px 0 32px;
      margin-top: auto;
      border-top: 1px solid #1c2b48;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h5 {
      font-size: 1rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
    }
    .footer-contact-item {
      font-size: 0.88rem;
      margin-bottom: 10px;
      color: #9cb2d4;
    }
    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-links-list li a {
      color: #9cb2d4;
      font-size: 0.88rem;
    }
    .footer-links-list li a:hover {
      color: #ffffff;
    }
    .qrcode-box {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .qrcode-box img {
      width: 96px;
      height: 96px;
      border-radius: var(--radius-sm);
      background: #ffffff;
      padding: 4px;
    }
    .qrcode-meta {
      font-size: 0.82rem;
      line-height: 1.5;
      color: #9cb2d4;
    }
    .friendly-links-wrap {
      border-top: 1px solid #1a2740;
      padding-top: 24px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      font-size: 0.85rem;
    }
    .friendly-links-wrap span {
      color: #ffffff;
      font-weight: 600;
    }
    .friendly-links-wrap a {
      color: #8da4ca;
    }
    .friendly-links-wrap a:hover {
      color: #ffffff;
    }
    .footer-bottom-bar {
      border-top: 1px solid #162035;
      padding-top: 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.82rem;
      color: #7287a8;
      flex-wrap: wrap;
      gap: 12px;
    }
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.1rem;
      font-weight: 800;
      transition: all 0.2s ease;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-3px);
    }
    .float-btn.top-btn {
      opacity: 0;
      visibility: hidden;
    }
    .float-btn.top-btn.visible {
      opacity: 1;
      visibility: visible;
    }
    @media (max-width: 992px) {
      .header-inner {
        position: relative;
      }
      .nav-links {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        flex-direction: column;
        align-items: stretch;
        padding: 16px 24px;
        display: none;
      }
      .nav-links.open {
        display: flex;
      }
      .nav-links li a {
        padding: 12px 16px;
        border-bottom: 1px solid #f0f4fa;
      }
      .menu-toggle {
        display: block;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .banner-highlight-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 640px) {
      .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .form-section-card {
        padding: 24px 16px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .header-cta-group .btn-secondary {
        display: none;
      }
      .score-badge-val {
        font-size: 2.6rem;
      }
      .eval-score-card {
        padding: 24px 18px;
      }
    }