/* 全局变量与撞色艳色风格基础 */
    :root {
      --primary: #2563eb;       /* 鲜活亮蓝 */
      --primary-hover: #1d4ed8;
      --accent-orange: #f97316; /* 活力亮橙 */
      --accent-purple: #7c3aed; /* 电光极紫 */
      --accent-cyan: #06b6d4;   /* 荧光青 */
      --accent-yellow: #f59e0b; /* 撞色亮黄 */
      --bg-light: #f8fafc;      /* 纯净底色 */
      --bg-card: #ffffff;       /* 卡片纯白 */
      --text-main: #0f172a;     /* 极深蓝黑标题正文 */
      --text-muted: #475569;    /* 易读辅助正文 */
      --border-color: #e2e8f0;  /* 结构分割线 */
      --border-highlight: #cbd5e1;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 16px 36px rgba(37, 99, 235, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

    * {
      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-light);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    /* 统一容器标准 */
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

    img {
      display: block;
      max-width: 100%;
      height: auto;
    }

    /* 标题与版块规范 */
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

    .section-wrap-alt {
      background-color: #f1f5f9;
    }

    .section-header {
      text-align: center;
      margin-bottom: 45px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, var(--accent-orange), var(--accent-purple));
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 720px;
      margin: 0 auto;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0; /* 严格满足系统要求 */
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      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: #eff6ff;
    }

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

    .btn-nav-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 18px;
      font-size: 0.92rem;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary), var(--accent-purple));
      border-radius: var(--radius-sm);
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    }

    .btn-nav-primary:hover {
      opacity: 0.95;
      transform: translateY(-1px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 6px 10px;
      cursor: pointer;
      color: var(--text-main);
      font-size: 1.2rem;
    }

    /* 首屏 HERO 区域 - 撞色纯色与几何科技卡片，严禁出现图片 */
    .hero-section {
      background: radial-gradient(circle at 85% 15%, #e0e7ff 0%, #f8fafc 60%);
      padding: 75px 0 65px;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content {
      text-align: left;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background-color: #eff6ff;
      border: 1px solid #bfdbfe;
      color: var(--primary);
      font-weight: 700;
      font-size: 0.88rem;
      padding: 6px 14px;
      border-radius: 30px;
      margin-bottom: 20px;
    }

    .hero-title {
      font-size: 2.4rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 18px;
      letter-spacing: -1px;
    }

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

    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 30px;
    }

    .hero-btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      margin-bottom: 35px;
    }

    .btn-main-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: linear-gradient(135deg, var(--accent-orange) 0%, #ea580c 100%);
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 800;
      padding: 14px 28px;
      border-radius: var(--radius-md);
      box-shadow: 0 8px 20px rgba(249, 115, 22, 0.35);
      border: none;
      cursor: pointer;
    }

    .btn-main-action:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(249, 115, 22, 0.45);
    }

    .btn-sub-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background-color: #ffffff;
      color: var(--text-main);
      border: 2px solid var(--border-color);
      font-size: 1rem;
      font-weight: 700;
      padding: 13px 24px;
      border-radius: var(--radius-md);
    }

    .btn-sub-action:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: #eff6ff;
    }

    /* 首屏数据卡片（纯CSS几何） */
    .hero-dashboard-card {
      background-color: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

    .dashboard-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 16px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 20px;
    }

    .status-indicator {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.85rem;
      font-weight: 700;
      color: #15803d;
      background-color: #dcfce7;
      padding: 4px 10px;
      border-radius: 12px;
    }

    .status-dot {
      width: 8px;
      height: 8px;
      background-color: #22c55e;
      border-radius: 50%;
    }

    .metric-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-bottom: 20px;
    }

    .metric-box {
      background-color: #f8fafc;
      border: 1px solid var(--border-color);
      padding: 16px;
      border-radius: var(--radius-md);
    }

    .metric-num {
      font-size: 1.6rem;
      font-weight: 900;
      color: var(--primary);
      display: block;
    }

    .metric-label {
      font-size: 0.82rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    .model-capsules {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .capsule {
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 6px;
      background-color: #f1f5f9;
      color: var(--text-main);
      border: 1px solid #cbd5e1;
    }

    .capsule-pop {
      background-color: #fef3c7;
      color: #b45309;
      border-color: #fde68a;
    }

    /* 通用卡片网格 */
    .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;
    }

    /* 平台卡片通用 */
    .feature-card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .feature-card-icon {
      width: 46px;
      height: 46px;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      font-weight: 900;
      margin-bottom: 16px;
      color: #ffffff;
    }

    .icon-blue { background: linear-gradient(135deg, var(--primary), #3b82f6); }
    .icon-orange { background: linear-gradient(135deg, var(--accent-orange), #ea580c); }
    .icon-purple { background: linear-gradient(135deg, var(--accent-purple), #9333ea); }
    .icon-cyan { background: linear-gradient(135deg, var(--accent-cyan), #0891b2); }

    .feature-card-title {
      font-size: 1.15rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .feature-card-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 模型矩阵胶囊群 */
    .model-matrix-box {
      background-color: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }

    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 15px;
    }

    .model-tag-item {
      padding: 8px 16px;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
      background-color: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      transition: all 0.2s;
    }

    .model-tag-item:hover {
      background-color: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

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

    .process-step {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      border-top: 4px solid var(--primary);
    }

    .process-num {
      font-size: 1.8rem;
      font-weight: 900;
      color: #cbd5e1;
      line-height: 1;
      margin-bottom: 10px;
    }

    .process-step-title {
      font-size: 1.1rem;
      font-weight: 800;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    /* 评测与对比表格板块 */
    .review-score-panel {
      display: grid;
      grid-template-columns: 320px 1fr;
      gap: 24px;
      background-color: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-md);
      margin-bottom: 30px;
    }

    .score-badge-card {
      background: linear-gradient(145deg, #1e293b, #0f172a);
      color: #ffffff;
      border-radius: var(--radius-md);
      padding: 28px;
      text-align: center;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
    }

    .score-stars {
      color: #facc15;
      font-size: 1.4rem;
      margin-bottom: 8px;
    }

    .score-val {
      font-size: 3.2rem;
      font-weight: 900;
      line-height: 1;
      color: #38bdf8;
      margin-bottom: 4px;
    }

    .score-max {
      font-size: 0.95rem;
      color: #94a3b8;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .score-desc {
      font-size: 0.9rem;
      color: #e2e8f0;
      line-height: 1.4;
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

    .compare-table th, .compare-table td {
      padding: 14px 16px;
      border-bottom: 1px solid var(--border-color);
    }

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

    .compare-table tr:hover td {
      background-color: #f8fafc;
    }

    .highlight-col {
      background-color: #eff6ff;
      color: var(--primary);
      font-weight: 700;
    }

    /* 素材案例画廊 */
    .media-card {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .media-card .img-container {
      width: 100%;
      background-color: #e2e8f0;
      overflow: hidden;
    }

    .media-card .img-container img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

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

    .media-card-body {
      padding: 18px;
    }

    .media-card-title {
      font-size: 1.05rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .media-card-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 用户评论卡片 */
    .testimonial-card {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-quote {
      font-size: 0.95rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 18px;
      font-style: normal;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }

    .user-avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent-orange));
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
    }

    .user-meta-name {
      font-size: 0.95rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .user-meta-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

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

    .faq-item {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      padding: 18px 22px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 700;
      transition: transform 0.25s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 22px 18px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px solid #f1f5f9;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

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

    /* 表单与交互区域 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 30px;
    }

    .contact-info-panel {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }

    .info-item-group {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 20px;
    }

    .info-row {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .info-label {
      font-weight: 700;
      min-width: 90px;
      color: var(--text-muted);
    }

    .qr-box-wrap {
      margin-top: 24px;
      padding-top: 20px;
      border-top: 1px solid var(--border-color);
      text-align: center;
    }

    .qr-box-wrap img {
      width: 140px;
      height: 140px;
      margin: 10px auto;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-sm);
    }

    .form-panel {
      background-color: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      font-size: 0.95rem;
      color: var(--text-main);
      background-color: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      transition: border-color 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
      background-color: #ffffff;
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .btn-submit {
      width: 100%;
      padding: 14px;
      font-size: 1.05rem;
      font-weight: 800;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
      border: none;
      border-radius: var(--radius-md);
      cursor: pointer;
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
      transition: all 0.2s;
    }

    .btn-submit:hover {
      opacity: 0.95;
      transform: translateY(-1px);
    }

    /* 行业资讯与文章 */
    .article-link-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 15px;
    }

    .article-chip {
      display: inline-flex;
      align-items: center;
      padding: 8px 16px;
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .article-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: #eff6ff;
    }

    /* 友情链接与页脚 */
    .site-footer {
      background-color: #0f172a;
      color: #e2e8f0;
      padding: 60px 0 30px;
      border-top: 4px solid var(--accent-orange);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand h4 {
      font-size: 1.4rem;
      font-weight: 900;
      color: #ffffff;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      color: #94a3b8;
      line-height: 1.6;
    }

    .footer-links-title {
      font-size: 1.05rem;
      font-weight: 800;
      color: #ffffff;
      margin-bottom: 16px;
    }

    .footer-friendly-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .footer-friendly-links a {
      color: #94a3b8;
      font-size: 0.88rem;
      background: #1e293b;
      padding: 5px 12px;
      border-radius: 4px;
    }

    .footer-friendly-links a:hover {
      color: #ffffff;
      background: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid #334155;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 悬浮辅助小窗与回到顶部 */
    .floating-widget {
      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-color: #ffffff;
      color: var(--text-main);
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      font-weight: 800;
      cursor: pointer;
      transition: all 0.2s;
    }

    .float-btn-primary {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    .float-btn:hover {
      transform: scale(1.08);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-grid { grid-template-columns: 1fr; }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .process-timeline { grid-template-columns: repeat(2, 1fr); }
      .review-score-panel { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
    }

    @media (max-width: 640px) {
      .section-wrap { padding: 45px 0; }
      .hero-title { font-size: 1.8rem; }
      .grid-3, .grid-4, .grid-2, .process-timeline { grid-template-columns: 1fr; }
      .metric-grid { grid-template-columns: 1fr; }
    }