:root {
      --bg-dark: #080612;
      --bg-surface: #100b24;
      --bg-card: rgba(26, 17, 56, 0.75);
      --bg-card-hover: rgba(38, 24, 82, 0.9);
      --pink-neon: #ff2a85;
      --purple-neon: #9d4edd;
      --cyan-neon: #00f0ff;
      --text-main: #f5f3ff;
      --text-muted: #b8b0d6;
      --border-glow: rgba(255, 42, 133, 0.35);
      --border-subtle: rgba(157, 78, 221, 0.25);
      --gradient-brand: linear-gradient(135deg, #ff2a85 0%, #7928ca 50%, #4361ee 100%);
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 50% 0%, #200d43 0%, #080612 70%);
      background-attachment: fixed;
      overflow-x: hidden;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(8, 6, 18, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-subtle);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--text-main);
      font-size: 1.25rem;
      font-weight: 700;
      letter-spacing: 0.5px;
    }
    .brand-logo .ai-page-logo {
      height: 40px;
      width: auto;
      filter: drop-shadow(0 0 8px rgba(255, 42, 133, 0.6));
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.95rem;
      padding: 8px 14px;
      border-radius: 6px;
      transition: all 0.25s ease;
      display: inline-block;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: #fff;
      text-shadow: 0 0 10px var(--pink-neon);
      background: rgba(255, 42, 133, 0.1);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      background: var(--gradient-brand);
      color: #fff;
      font-weight: 600;
      font-size: 0.95rem;
      border-radius: 30px;
      text-decoration: none;
      border: 1px solid rgba(255, 255, 255, 0.3);
      box-shadow: 0 0 18px rgba(255, 42, 133, 0.45);
      transition: all 0.3s ease;
      cursor: pointer;
    }
    .btn-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 26px rgba(255, 42, 133, 0.8);
      color: #fff;
    }
    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      background: rgba(255, 255, 255, 0.05);
      color: var(--text-main);
      font-weight: 600;
      font-size: 0.95rem;
      border-radius: 30px;
      text-decoration: none;
      border: 1px solid var(--purple-neon);
      transition: all 0.3s ease;
    }
    .btn-outline:hover {
      background: rgba(157, 78, 221, 0.2);
      border-color: var(--pink-neon);
      color: #fff;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-subtle);
      color: #fff;
      padding: 8px 12px;
      border-radius: 6px;
      cursor: pointer;
      font-size: 1.2rem;
    }

    /* Section 通用 */
    section {
      padding: 70px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--pink-neon);
      text-transform: uppercase;
      letter-spacing: 2px;
      margin-bottom: 12px;
      background: rgba(255, 42, 133, 0.1);
      padding: 4px 14px;
      border-radius: 20px;
      border: 1px solid rgba(255, 42, 133, 0.25);
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: #fff;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-title span {
      background: linear-gradient(90deg, #ff2a85, #00f0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 1.05rem;
    }

    /* 首屏 Hero (严禁出现图片) */
    .hero-section {
      padding: 90px 0 70px 0;
      text-align: center;
      position: relative;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(157, 78, 221, 0.15);
      border: 1px solid rgba(255, 42, 133, 0.4);
      padding: 6px 18px;
      border-radius: 50px;
      font-size: 0.9rem;
      color: #ff85be;
      margin-bottom: 24px;
      box-shadow: 0 0 15px rgba(255, 42, 133, 0.2);
    }
    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background: #00f0ff;
      border-radius: 50%;
      box-shadow: 0 0 8px #00f0ff;
      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: 2.8rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 24px;
      color: #ffffff;
      text-shadow: 0 0 20px rgba(157, 78, 221, 0.4);
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 18px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }
    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: 14px;
      padding: 24px 16px;
      backdrop-filter: blur(8px);
      transition: all 0.3s ease;
    }
    .stat-card:hover {
      border-color: var(--pink-neon);
      transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(255, 42, 133, 0.25);
    }
    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      background: linear-gradient(135deg, #ff2a85, #00f0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 6px;
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    /* 平台介绍 & 特性卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: 14px;
      padding: 28px;
      backdrop-filter: blur(10px);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      border-color: var(--border-glow);
      background: var(--bg-card-hover);
      transform: translateY(-5px);
      box-shadow: 0 10px 30px rgba(157, 78, 221, 0.25);
    }
    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(255, 42, 133, 0.15);
      border: 1px solid rgba(255, 42, 133, 0.4);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      color: var(--pink-neon);
      margin-bottom: 18px;
    }
    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 10px;
    }
    .card-text {
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.65;
      flex-grow: 1;
    }

    /* 支持模型标签云 */
    .model-tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-tag {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(157, 78, 221, 0.3);
      padding: 7px 16px;
      border-radius: 20px;
      font-size: 0.85rem;
      color: #e2dcfa;
      transition: all 0.2s ease;
    }
    .model-tag:hover {
      border-color: var(--cyan-neon);
      color: var(--cyan-neon);
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
      transform: scale(1.05);
    }

    /* 流程步骤 */
    .step-list {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: 14px;
      padding: 24px;
      position: relative;
    }
    .step-number {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--pink-neon);
      opacity: 0.8;
      margin-bottom: 12px;
      font-family: monospace;
    }

    /* 对比评测模块 */
    .evaluation-hero-card {
      background: linear-gradient(135deg, rgba(255, 42, 133, 0.15) 0%, rgba(114, 9, 183, 0.2) 100%);
      border: 1px solid var(--pink-neon);
      border-radius: 16px;
      padding: 32px;
      text-align: center;
      margin-bottom: 30px;
      box-shadow: 0 0 30px rgba(255, 42, 133, 0.25);
    }
    .rating-stars {
      color: #ffd166;
      font-size: 1.8rem;
      letter-spacing: 4px;
      margin-bottom: 10px;
    }
    .rating-score {
      font-size: 2.8rem;
      font-weight: 900;
      color: #fff;
      display: inline-flex;
      align-items: baseline;
      gap: 6px;
    }
    .rating-score small {
      font-size: 1.2rem;
      color: var(--text-muted);
      font-weight: normal;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      border: 1px solid var(--border-subtle);
      border-radius: 14px;
      background: var(--bg-surface);
    }
    .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 rgba(255, 255, 255, 0.06);
    }
    .compare-table th {
      background: rgba(255, 42, 133, 0.1);
      color: #fff;
      font-weight: 700;
    }
    .compare-table td:nth-child(2) {
      color: #00f0ff;
      font-weight: 600;
      background: rgba(0, 240, 255, 0.03);
    }
    .compare-table tr:hover td {
      background: rgba(255, 255, 255, 0.02);
    }

    /* 案例图片展示区 (非首屏) */
    .media-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
      align-items: stretch;
    }
    .media-box {
      border-radius: 14px;
      overflow: hidden;
      border: 1px solid var(--border-subtle);
      background: var(--bg-surface);
      display: flex;
      flex-direction: column;
    }
    .media-box img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }
    .media-box:hover img {
      transform: scale(1.03);
    }
    .media-info {
      padding: 18px;
    }
    .banner-strip {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 24px;
    }
    .banner-strip-item {
      border-radius: 10px;
      overflow: hidden;
      border: 1px solid var(--border-subtle);
    }
    .banner-strip-item img {
      width: 100%;
      height: 120px;
      object-fit: cover;
      display: block;
    }

    /* 用户评论 */
    .review-user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
      padding-top: 14px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .user-avatar-badge {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--gradient-brand);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }
    .user-role-title {
      font-size: 0.85rem;
      color: var(--pink-neon);
    }
    .user-name {
      font-weight: 600;
      font-size: 0.95rem;
      color: #fff;
    }

    /* FAQ 折叠面板 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: 12px;
      overflow: hidden;
      transition: all 0.3s ease;
    }
    .faq-header {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
      font-weight: 600;
      color: #fff;
      font-size: 1.05rem;
    }
    .faq-header:hover {
      color: var(--pink-neon);
    }
    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
      color: var(--purple-neon);
    }
    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }
    .faq-item.active {
      border-color: var(--pink-neon);
      background: var(--bg-card-hover);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--pink-neon);
    }
    .faq-item.active .faq-body {
      max-height: 250px;
      padding: 0 24px 20px 24px;
    }

    /* 需求表单与联系 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 36px;
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: 16px;
      padding: 40px;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 0.9rem;
      margin-bottom: 8px;
      color: #e2dcfa;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      background: rgba(10, 7, 22, 0.7);
      border: 1px solid var(--border-subtle);
      border-radius: 8px;
      color: #fff;
      font-size: 0.95rem;
      outline: none;
      transition: all 0.25s ease;
    }
    .form-control:focus {
      border-color: var(--pink-neon);
      box-shadow: 0 0 10px rgba(255, 42, 133, 0.4);
    }
    select.form-control option {
      background: #150f2e;
      color: #fff;
    }
    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 14px;
      font-size: 0.95rem;
      color: var(--text-muted);
    }
    .contact-info-item strong {
      color: #fff;
    }
    .qr-container {
      margin-top: 16px;
      padding: 16px;
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-subtle);
      border-radius: 12px;
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }
    .qr-container img {
      width: 120px;
      height: 120px;
      object-fit: cover;
      border-radius: 8px;
    }

    /* 行业资讯 & 最新文章 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 20px;
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: 10px;
      text-decoration: none;
      color: var(--text-main);
      transition: all 0.25s ease;
    }
    .article-item:hover {
      border-color: var(--cyan-neon);
      transform: translateX(6px);
      color: #00f0ff;
    }

    /* 页脚 */
    .site-footer {
      background: #04030a;
      border-top: 1px solid var(--border-subtle);
      padding: 50px 0 30px 0;
      margin-top: auto;
      color: #8c82ab;
      font-size: 0.9rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #fff;
      font-size: 1.05rem;
      margin-bottom: 16px;
      font-weight: 700;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-links a {
      color: #8c82ab;
      text-decoration: none;
      transition: color 0.2s ease;
    }
    .footer-links a:hover {
      color: var(--pink-neon);
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 8px;
    }
    .friend-links-box a {
      color: #8c82ab;
      text-decoration: none;
      background: rgba(255, 255, 255, 0.04);
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.82rem;
      border: 1px solid rgba(255, 255, 255, 0.08);
      transition: all 0.2s ease;
    }
    .friend-links-box a:hover {
      color: #fff;
      border-color: var(--pink-neon);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* 浮动工具栏 */
    .float-dock {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--bg-surface);
      border: 1px solid var(--pink-neon);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: 0 4px 16px rgba(255, 42, 133, 0.4);
      transition: all 0.3s ease;
      text-decoration: none;
    }
    .float-btn:hover {
      transform: scale(1.1);
      background: var(--pink-neon);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .grid-4, .hero-stats-grid, .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .media-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #0d091e;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-subtle);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .grid-4, .grid-3, .grid-2, .hero-stats-grid, .step-list {
        grid-template-columns: 1fr;
      }
      .banner-strip {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
    }