:root {
      --primary: #7928ca;
      --primary-light: #9d4edd;
      --primary-glow: #c77dff;
      --accent: #ff007a;
      --bg-page: #f9f8ff;
      --bg-surface: #ffffff;
      --bg-subtle: #f3f0fb;
      --text-main: #1f1a2e;
      --text-muted: #5e5873;
      --text-light: #8e88a8;
      --border-color: #e5def5;
      --shadow-sm: 0 4px 12px rgba(121, 40, 202, 0.05);
      --shadow-md: 0 10px 30px rgba(121, 40, 202, 0.08);
      --shadow-lg: 0 18px 45px rgba(121, 40, 202, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      background-image: 
        radial-gradient(at 0% 0%, rgba(157, 78, 221, 0.07) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(255, 0, 122, 0.05) 0px, transparent 50%);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      overflow-x: hidden;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      vertical-align: middle;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .logo-area img.ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .logo-text {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: rgba(121, 40, 202, 0.05);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: 999px;
      padding: 10px 22px;
      transition: all 0.25s ease;
      cursor: pointer;
      font-size: 0.95rem;
      border: 1px solid transparent;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 50%, var(--accent) 100%);
      color: #ffffff;
      box-shadow: 0 4px 16px rgba(121, 40, 202, 0.3);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(121, 40, 202, 0.45);
      color: #ffffff;
    }
    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(121, 40, 202, 0.03);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #ffffff;
    }
    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .menu-toggle svg {
      width: 26px;
      height: 26px;
      stroke: var(--text-main);
    }

    .hero-section {
      padding: 84px 0 64px;
      position: relative;
    }
    .hero-wrap {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(121, 40, 202, 0.08);
      border: 1px solid rgba(121, 40, 202, 0.2);
      border-radius: 999px;
      color: var(--primary);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -1px;
      color: var(--text-main);
    }
    .hero-title span {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.8;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-cta {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .hero-badges {
      display: flex;
      justify-content: center;
      gap: 28px;
      flex-wrap: wrap;
      font-size: 0.92rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    .hero-badges span {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }
    .metric-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .metric-number {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 2px;
    }
    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .section-wrap {
      padding: 72px 0;
    }
    .section-head {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 52px;
    }
    .section-pill {
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary);
      letter-spacing: 1px;
      background: rgba(121, 40, 202, 0.08);
      display: inline-block;
      padding: 4px 12px;
      border-radius: 999px;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1rem;
    }

    .model-pills {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 30px;
    }
    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 18px;
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-muted);
      transition: all 0.2s ease;
    }
    .model-pill:hover {
      border-color: var(--primary-light);
      color: var(--primary);
      transform: translateY(-2px);
      box-shadow: var(--shadow-sm);
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      transition: all 0.25s ease;
      position: relative;
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      border-color: var(--primary-glow);
      box-shadow: var(--shadow-md);
    }
    .feature-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(121, 40, 202, 0.1) 0%, rgba(255, 0, 122, 0.1) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: var(--primary);
      font-size: 1.4rem;
    }
    .feature-title {
      font-size: 1.18rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .feature-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .process-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
      position: relative;
    }
    .step-badge {
      width: 44px;
      height: 44px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      font-weight: 700;
      margin: 0 auto 16px;
      box-shadow: 0 4px 12px rgba(121, 40, 202, 0.25);
    }
    .step-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    .compare-container {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .score-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, rgba(121, 40, 202, 0.08) 0%, rgba(255, 0, 122, 0.06) 100%);
      border: 1px solid rgba(121, 40, 202, 0.15);
      border-radius: var(--radius-md);
      padding: 24px 30px;
      margin-bottom: 28px;
    }
    .score-left h3 {
      font-size: 1.3rem;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .score-left p {
      font-size: 0.92rem;
      color: var(--text-muted);
    }
    .score-right {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }
    .score-val {
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--primary);
    }
    .score-stars {
      color: #ff9900;
      font-size: 1.1rem;
      letter-spacing: 2px;
    }
    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.94rem;
    }
    .compare-table th {
      background: var(--bg-subtle);
      color: var(--text-main);
      font-weight: 700;
    }
    .highlight-col {
      background: rgba(121, 40, 202, 0.03);
      font-weight: 600;
      color: var(--primary);
    }

    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 24px;
    }
    .gallery-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .gallery-img-wrap {
      aspect-ratio: 16 / 9;
      background: #eee;
      overflow: hidden;
    }
    .gallery-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.35s ease;
    }
    .gallery-item:hover .gallery-img-wrap img {
      transform: scale(1.03);
    }
    .gallery-info {
      padding: 20px;
    }
    .gallery-info h4 {
      font-size: 1.05rem;
      margin-bottom: 6px;
    }
    .gallery-info p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .gallery-grid-third {
      display: grid;
      grid-template-columns: 1fr 2fr;
      gap: 24px;
    }
    .square-wrap {
      aspect-ratio: 1 / 1;
    }

    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
    }
    .review-body {
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .avatar-char {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-glow) 100%);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }
    .author-meta h5 {
      font-size: 0.95rem;
      color: var(--text-main);
    }
    .author-meta span {
      font-size: 0.82rem;
      color: var(--text-light);
    }

    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }
    .faq-item.active {
      border-color: var(--primary-light);
    }
    .faq-header {
      padding: 18px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      user-select: none;
      font-weight: 600;
      font-size: 1rem;
    }
    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-content {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px solid rgba(121, 40, 202, 0.05);
      padding-top: 14px;
    }
    .faq-item.active .faq-content {
      display: block;
    }

    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
      margin-top: 24px;
    }
    .contact-item-row {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }
    .contact-qr {
      width: 130px;
      padding: 8px;
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-top: 10px;
    }
    .contact-qr img {
      width: 100%;
      display: block;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #faf8ff;
      outline: none;
      transition: border-color 0.2s ease;
      font-family: inherit;
    }
    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .articles-block {
      background: var(--bg-subtle);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 36px;
    }
    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px 20px;
      margin-top: 12px;
      font-size: 0.9rem;
    }
    .article-links a {
      color: var(--primary);
      text-decoration: underline;
    }

    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 28px;
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 36px;
    }
    .footer-brand h4 {
      color: var(--primary);
      font-size: 1.25rem;
      margin-bottom: 12px;
      font-weight: 700;
    }
    .footer-col h5 {
      color: var(--text-main);
      font-size: 0.98rem;
      margin-bottom: 14px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 8px;
    }
    .footer-col ul li a:hover {
      color: var(--primary);
    }
    .friend-links-area {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      margin-bottom: 24px;
    }
    .friend-links-title {
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    .friend-links-list a {
      color: var(--text-muted);
    }
    .friend-links-list a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid #f0ecf8;
      padding-top: 20px;
      text-align: center;
      color: var(--text-light);
      font-size: 0.85rem;
    }

    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .tool-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;
      color: var(--primary);
      cursor: pointer;
      transition: all 0.25s ease;
    }
    .tool-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-3px);
    }

    @media (max-width: 992px) {
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metric-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-container {
        grid-template-columns: 1fr;
      }
      .review-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .gallery-grid-third {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        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.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 10px;
      }
    }
    @media (max-width: 640px) {
      .features-grid,
      .metric-grid,
      .process-timeline,
      .gallery-grid,
      .review-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2.1rem;
      }
      .score-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
      }
    }