/* 撞色艳色风 - 核心设计规范 (浅色背景 + 高饱和活力撞色) */
    :root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-card-alt: #f1f5f9;
      --color-primary: #0052d9;      /* 科技宝蓝 */
      --color-primary-dark: #003cab;
      --color-accent-pink: #ff1379;   /* 艳丽品红 */
      --color-accent-yellow: #ffb800; /* 亮丽琥珀黄 */
      --color-accent-cyan: #00d2b4;   /* 电光青绿 */
      --color-accent-purple: #7928ca; /* 鲜艳紫电 */
      --color-text-main: #0f172a;     /* 高对比极深青蓝灰，确保可读性 */
      --color-text-muted: #334155;    /* 深中性灰 */
      --color-text-sub: #64748b;      /* 辅助弱文字 */
      --border-color: #e2e8f0;
      --border-vibrant: #cbd5e1;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.06);
      --shadow-pop: 5px 5px 0px #0f172a;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --transition: all 0.25s 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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--color-text-main);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    /* 统一居中容器规范 */
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 (gap必须为0) */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid var(--color-text-main);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    }

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

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-wrap .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--color-text-main);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0; /* 严格符合规范：gap为0 */
      list-style: none;
    }

    .nav-links li a {
      display: inline-block;
      padding: 10px 14px;
      color: var(--color-text-main);
      font-weight: 600;
      font-size: 0.95rem;
      text-decoration: none;
      transition: var(--transition);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--color-primary);
      background-color: rgba(0, 82, 217, 0.08);
    }

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

    .btn-pop {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      color: #ffffff;
      background: var(--color-accent-pink);
      border: 2px solid var(--color-text-main);
      box-shadow: 3px 3px 0 var(--color-text-main);
      border-radius: var(--radius-sm);
      text-decoration: none;
      cursor: pointer;
      transition: var(--transition);
    }

    .btn-pop:hover {
      transform: translate(-2px, -2px);
      box-shadow: 5px 5px 0 var(--color-text-main);
      background: #e60067;
    }

    .btn-yellow {
      background: var(--color-accent-yellow);
      color: var(--color-text-main);
    }
    .btn-yellow:hover {
      background: #f0ad00;
    }

    .btn-primary {
      background: var(--color-primary);
      color: #ffffff;
    }
    .btn-primary:hover {
      background: var(--color-primary-dark);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 2px solid var(--color-text-main);
      padding: 6px 10px;
      font-weight: bold;
      border-radius: var(--radius-sm);
      cursor: pointer;
    }

    /* 区域通用样式 */
    .section-block {
      padding: 80px 0;
      position: relative;
    }

    .section-alt {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-head {
      text-align: center;
      margin-bottom: 50px;
    }

    .badge-pop {
      display: inline-block;
      padding: 6px 16px;
      font-size: 0.85rem;
      font-weight: 800;
      text-transform: uppercase;
      color: var(--color-text-main);
      background: var(--color-accent-yellow);
      border: 2px solid var(--color-text-main);
      border-radius: 99px;
      box-shadow: 2px 2px 0 var(--color-text-main);
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2.3rem;
      font-weight: 900;
      color: var(--color-text-main);
      letter-spacing: -0.5px;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--color-text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

    /* 首屏 HERO 区域 - 严禁出现任何图片 */
    .hero-section {
      padding: 90px 0 80px;
      background: radial-gradient(circle at 10% 20%, rgba(255, 184, 0, 0.15) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(0, 82, 217, 0.12) 0%, transparent 40%),
                  #f8fafc;
      border-bottom: 2px solid var(--color-text-main);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 880px;
      margin: 0 auto;
    }

    .hero-h1 {
      font-size: 3rem;
      line-height: 1.25;
      font-weight: 900;
      color: var(--color-text-main);
      margin-bottom: 24px;
      letter-spacing: -1px;
    }

    .hero-h1 span {
      background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent-pink) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--color-text-muted);
      margin-bottom: 36px;
      font-weight: 500;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
      gap: 18px;
      margin-bottom: 48px;
    }

    .hero-official-btn {
      font-size: 1.15rem;
      padding: 15px 36px;
      background: var(--color-accent-pink);
      color: #ffffff;
      border: 3px solid var(--color-text-main);
      box-shadow: 6px 6px 0 var(--color-text-main);
      border-radius: var(--radius-md);
      font-weight: 800;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 10px;
      transition: var(--transition);
    }

    .hero-official-btn:hover {
      transform: translate(-3px, -3px);
      box-shadow: 9px 9px 0 var(--color-text-main);
      background: #e60067;
    }

    .hero-sub-btn {
      font-size: 1.15rem;
      padding: 15px 32px;
      background: #ffffff;
      color: var(--color-text-main);
      border: 3px solid var(--color-text-main);
      box-shadow: 5px 5px 0 var(--color-text-main);
      border-radius: var(--radius-md);
      font-weight: 800;
      text-decoration: none;
      transition: var(--transition);
    }

    .hero-sub-btn:hover {
      transform: translate(-2px, -2px);
      box-shadow: 7px 7px 0 var(--color-text-main);
      background: var(--color-accent-yellow);
    }

    .hero-metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 20px;
    }

    .metric-card {
      background: #ffffff;
      border: 2px solid var(--color-text-main);
      border-radius: var(--radius-md);
      padding: 22px 14px;
      box-shadow: 4px 4px 0 var(--color-text-main);
      text-align: center;
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: 6px 6px 0 var(--color-text-main);
    }

    .metric-val {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--color-primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .metric-name {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--color-text-muted);
    }

    /* 标签云与支持模型 */
    .models-stream {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 32px;
    }

    .model-tag {
      background: #ffffff;
      border: 1.5px solid var(--color-text-main);
      border-radius: 99px;
      padding: 6px 14px;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--color-text-main);
      box-shadow: 2px 2px 0 var(--color-text-main);
      transition: var(--transition);
    }

    .model-tag:hover {
      background: var(--color-accent-cyan);
      transform: translateY(-2px);
    }

    /* 卡片网格体系 */
    .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: 28px;
    }

    .pop-card {
      background: #ffffff;
      border: 2px solid var(--color-text-main);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: 5px 5px 0 var(--color-text-main);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .pop-card:hover {
      transform: translate(-3px, -3px);
      box-shadow: 8px 8px 0 var(--color-text-main);
    }

    .pop-card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      border: 2px solid var(--color-text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 900;
      margin-bottom: 20px;
      background: var(--color-accent-yellow);
    }

    .icon-pink { background: var(--color-accent-pink); color: #ffffff; }
    .icon-cyan { background: var(--color-accent-cyan); }
    .icon-purple { background: var(--color-accent-purple); color: #ffffff; }
    .icon-blue { background: var(--color-primary); color: #ffffff; }

    .pop-card h3 {
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 12px;
      color: var(--color-text-main);
    }

    .pop-card p {
      font-size: 0.95rem;
      color: var(--color-text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 流程步骤 */
    .step-track {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-item {
      background: #ffffff;
      border: 2px solid var(--color-text-main);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 4px 4px 0 var(--color-text-main);
      position: relative;
    }

    .step-num {
      display: inline-block;
      font-size: 1.6rem;
      font-weight: 900;
      color: #ffffff;
      background: var(--color-text-main);
      padding: 2px 14px;
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
    }

    /* 对比评测表格 */
    .compare-container {
      background: #ffffff;
      border: 3px solid var(--color-text-main);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: 7px 7px 0 var(--color-text-main);
    }

    .score-badge-wrap {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 2px dashed var(--border-color);
      margin-bottom: 28px;
    }

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

    .score-number {
      font-size: 3.4rem;
      font-weight: 900;
      color: var(--color-accent-pink);
      line-height: 1;
    }

    .score-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      font-weight: 800;
    }

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

    .compare-table {
      width: 100%;
      border-collapse: separate;
      border-spacing: 0;
      text-align: left;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background: #f8fafc;
      font-weight: 800;
      color: var(--color-text-main);
      border-bottom: 2px solid var(--color-text-main);
    }

    .compare-table tr:last-child td {
      border-bottom: none;
    }

    .compare-table .highlight-col {
      background: rgba(0, 82, 217, 0.05);
      font-weight: 700;
      color: var(--color-primary);
    }

    /* 素材图片展示区 */
    .media-gallery-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: stretch;
    }

    .media-card {
      background: #ffffff;
      border: 2px solid var(--color-text-main);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 5px 5px 0 var(--color-text-main);
      display: flex;
      flex-direction: column;
    }

    .media-img-holder {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .media-card img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }

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

    .media-info {
      padding: 20px;
      flex-grow: 1;
    }

    /* 用户评论卡片 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 2px solid var(--color-text-main);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 4px 4px 0 var(--color-text-main);
      display: flex;
      flex-direction: column;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--color-accent-cyan);
      border: 2px solid var(--color-text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      color: var(--color-text-main);
    }

    .review-meta h4 {
      font-size: 1rem;
      font-weight: 800;
      color: var(--color-text-main);
    }

    .review-meta span {
      font-size: 0.82rem;
      color: var(--color-text-sub);
    }

    .review-body {
      font-size: 0.92rem;
      color: var(--color-text-muted);
      line-height: 1.6;
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 2px solid var(--color-text-main);
      border-radius: var(--radius-md);
      box-shadow: 3px 3px 0 var(--color-text-main);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 22px;
      font-weight: 800;
      font-size: 1.05rem;
      color: var(--color-text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-question:hover {
      background: #f8fafc;
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      font-weight: 900;
      transition: transform 0.25s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 22px 20px;
      font-size: 0.95rem;
      color: var(--color-text-muted);
      border-top: 1px solid var(--border-color);
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      display: block;
      padding-top: 16px;
    }

    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
      color: var(--color-accent-pink);
    }

    /* 需求匹配与联系我们表单区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 32px;
      background: #ffffff;
      border: 3px solid var(--color-text-main);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: 7px 7px 0 var(--color-text-main);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--color-text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 2px solid var(--color-text-main);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #f8fafc;
      color: var(--color-text-main);
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      background: #ffffff;
      border-color: var(--color-primary);
      box-shadow: 0 0 0 3px rgba(0, 82, 217, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    .contact-info-panel {
      background: var(--bg-card-alt);
      border: 2px solid var(--color-text-main);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .qr-card {
      background: #ffffff;
      border: 2px solid var(--color-text-main);
      padding: 16px;
      border-radius: var(--radius-sm);
      text-align: center;
    }

    .qr-card img {
      max-width: 140px;
      height: auto;
      margin: 0 auto 10px;
      display: block;
      border: 1px solid var(--border-color);
    }

    .contact-meta-item {
      font-size: 0.95rem;
      color: var(--color-text-main);
    }

    .contact-meta-item strong {
      display: inline-block;
      min-width: 80px;
    }

    /* 资讯列表 */
    .article-links-container {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 14px;
      margin-top: 24px;
    }

    .article-tag-btn {
      display: block;
      padding: 12px 16px;
      background: #ffffff;
      border: 2px solid var(--color-text-main);
      border-radius: var(--radius-sm);
      color: var(--color-text-main);
      font-weight: 700;
      text-decoration: none;
      box-shadow: 3px 3px 0 var(--color-text-main);
      transition: var(--transition);
      text-align: center;
    }

    .article-tag-btn:hover {
      background: var(--color-accent-yellow);
      transform: translate(-2px, -2px);
      box-shadow: 5px 5px 0 var(--color-text-main);
    }

    /* 友情链接与页脚 */
    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .friend-links-wrap a {
      display: inline-block;
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      color: var(--color-text-muted);
      text-decoration: none;
      font-size: 0.9rem;
      transition: var(--transition);
    }

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

    .site-footer {
      background: #ffffff;
      border-top: 2px solid var(--color-text-main);
      padding: 40px 0 30px;
    }

    .footer-content {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 20px;
      margin-bottom: 24px;
    }

    .footer-copy {
      font-size: 0.9rem;
      color: var(--color-text-muted);
      text-align: center;
      padding-top: 20px;
      border-top: 1px solid var(--border-color);
    }

    /* 浮动操作条 */
    .float-dock {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-dock-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 2px solid var(--color-text-main);
      border-radius: 50%;
      box-shadow: 3px 3px 0 var(--color-text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      cursor: pointer;
      text-decoration: none;
      color: var(--color-text-main);
      transition: var(--transition);
    }

    .float-dock-btn:hover {
      transform: translate(-2px, -2px);
      box-shadow: 5px 5px 0 var(--color-text-main);
      background: var(--color-accent-yellow);
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .grid-4, .step-track {
        grid-template-columns: repeat(2, 1fr);
      }
      .reviews-grid, .media-gallery-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .header-inner {
        position: relative;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 2px solid var(--color-text-main);
        flex-direction: column;
        padding: 16px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.08);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 12px;
      }
      .hero-h1 {
        font-size: 2.2rem;
      }
      .hero-metrics-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-2, .reviews-grid, .media-gallery-grid {
        grid-template-columns: 1fr;
      }
      .step-track {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .header-actions .btn-pop {
        padding: 8px 14px;
        font-size: 0.85rem;
      }
    }