/* 基础重置与色彩变量 - 桃红艳丽风 (Vibrant Rose) */
    :root {
      --primary: #e11d48;       /* 鲜艳桃红 */
      --primary-hover: #be123c; /* 深桃红 */
      --primary-light: #fff1f2; /* 浅桃粉背景 */
      --accent: #db2777;        /* 霓虹洋红 */
      --accent-glow: rgba(225, 29, 72, 0.18);
      --gradient-main: linear-gradient(135deg, #e11d48 0%, #db2777 50%, #f43f5e 100%);
      --gradient-soft: linear-gradient(135deg, #fff1f2 0%, #ffe4e6 100%);
      --text-main: #0f172a;     /* 深炭黑 */
      --text-regular: #334155;  /* 正文深灰 */
      --text-muted: #64748b;    /* 次级深灰 */
      --bg-page: #fdfafb;       /* 页面底色：浅暖白 */
      --bg-card: #ffffff;       /* 卡片纯白 */
      --border-color: #fecdd3;  /* 柔粉边框 */
      --shadow-sm: 0 2px 8px rgba(225, 29, 72, 0.05);
      --shadow-md: 0 8px 24px rgba(225, 29, 72, 0.08);
      --shadow-lg: 0 16px 36px rgba(225, 29, 72, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.28s ease;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-regular);
      line-height: 1.65;
      overflow-x: hidden;
      min-width: 320px;
    }

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

    /* 链接与通用 */
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    /* 顶部导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-area .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }
    .brand-text {
      display: flex;
      flex-direction: column;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .brand-subtitle {
      font-size: 0.75rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 导航菜单 - 严格满足 gap: 0 要求 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
      margin: 0;
      padding: 0;
    }
    .nav-links li {
      display: inline-block;
    }
    .nav-links a {
      display: block;
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-regular);
      border-radius: var(--radius-sm);
      margin: 0 1px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background: var(--primary-light);
    }

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

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      padding: 10px 22px;
      font-size: 0.95rem;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--gradient-main);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(225, 29, 72, 0.35);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #be123c 0%, #be185d 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(225, 29, 72, 0.45);
      color: #ffffff;
    }
    .btn-outline {
      background: #ffffff;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary-light);
      border-color: var(--primary-hover);
      color: var(--primary-hover);
    }
    .btn-lg {
      padding: 14px 32px;
      font-size: 1.08rem;
      border-radius: var(--radius-lg);
    }

    /* 移动端汉堡菜单 */
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* 模块通用标题与排版 */
    section {
      padding: 72px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 48px;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-light);
      color: var(--primary);
      border: 1px solid var(--border-color);
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: 999px;
      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: 14px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 首屏 HERO 区域 - 严禁出现任何图片，纯CSS与科技质感渐变 */
    .hero-section {
      padding: 88px 0 76px;
      background: radial-gradient(circle at 50% 20%, rgba(225, 29, 72, 0.08) 0%, rgba(253, 250, 251, 0) 70%),
                  linear-gradient(180deg, #ffffff 0%, var(--bg-page) 100%);
      border-bottom: 1px solid var(--border-color);
      text-align: center;
    }
    .hero-content {
      max-width: 920px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 18px;
      border-radius: 999px;
      font-size: 0.9rem;
      color: var(--primary);
      font-weight: 700;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }
    .hero-badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary);
      box-shadow: 0 0 8px var(--primary);
    }
    .hero-title {
      font-size: 2.85rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title-highlight {
      color: var(--primary);
      display: inline-block;
      position: relative;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-regular);
      max-width: 780px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }
    .hero-btns {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      box-shadow: var(--shadow-md);
    }
    .hero-stat-item {
      text-align: center;
      border-right: 1px solid #f1f5f9;
    }
    .hero-stat-item:last-child {
      border-right: none;
    }
    .hero-stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }
    .hero-stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-top: 4px;
      font-weight: 500;
    }

    /* 通用卡片与网格 */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #f43f5e;
    }
    .card-icon {
      width: 52px;
      height: 52px;
      border-radius: var(--radius-md);
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      font-weight: bold;
    }
    .card-title {
      font-size: 1.22rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 模型矩阵胶囊标签区 */
    .models-cloud {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      margin-top: 36px;
    }
    .models-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 20px;
      text-align: center;
    }
    .badge-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }
    .badge-item {
      padding: 6px 16px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 600;
      border: 1px solid #fecdd3;
      transition: var(--transition);
    }
    .badge-item:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.05);
    }

    /* 图文混排与宣传图模块 */
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 32px;
    }
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-img-wrapper {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #f1f5f9;
    }
    .media-img-wrapper img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }
    .media-card:hover .media-img-wrapper img {
      transform: scale(1.03);
    }
    .media-body {
      padding: 24px;
    }

    /* 对比评测卡片与表格 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #fff1f2 0%, #ffffff 100%);
      border: 2px solid var(--primary);
      border-radius: var(--radius-lg);
      padding: 32px;
      margin-bottom: 36px;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }
    .eval-score-wrap {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }
    .eval-score {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }
    .eval-score-max {
      font-size: 1.2rem;
      color: var(--text-muted);
      font-weight: 600;
    }
    .eval-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

    .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);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }
    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
    }
    .compare-table th {
      background: var(--primary-light);
      color: var(--text-main);
      font-weight: 700;
    }
    .compare-table td.highlight {
      font-weight: 700;
      color: var(--primary);
      background: rgba(225, 29, 72, 0.03);
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }

    /* 流程步骤 */
    .step-item {
      position: relative;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .step-badge {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      margin-bottom: 14px;
    }

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.96rem;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 250px;
      padding-bottom: 20px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 用户评论卡片 */
    .review-card {
      background: #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;
    }
    .review-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }
    .review-avatar {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.1rem;
      border: 1px solid var(--border-color);
    }
    .review-name {
      font-weight: 700;
      color: var(--text-main);
      font-size: 1rem;
    }
    .review-role {
      font-size: 0.82rem;
      color: var(--text-muted);
    }
    .review-quote {
      font-size: 0.94rem;
      color: var(--text-regular);
      line-height: 1.6;
      font-style: italic;
    }

    /* 表单区域 */
    .form-section-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 0.92rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      background: #f8fafc;
      color: var(--text-main);
      transition: var(--transition);
      outline: none;
    }
    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(225, 29, 72, 0.12);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 资讯与外链列表 */
    .news-card-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .news-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 16px 20px;
      transition: var(--transition);
    }
    .news-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }
    .news-item-title {
      font-weight: 600;
      color: var(--text-main);
    }
    .news-item-link {
      font-size: 0.88rem;
      color: var(--primary);
      font-weight: 600;
    }

    /* 友情链接与文章链接条 */
    .links-block {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 32px;
    }
    .links-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .links-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 12px 20px;
    }
    .links-flex a {
      font-size: 0.9rem;
      color: var(--text-regular);
      font-weight: 500;
    }
    .links-flex a:hover {
      color: var(--primary);
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 56px 0 32px;
      color: var(--text-regular);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col-title {
      font-size: 1.08rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 18px;
    }
    .footer-contact-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 0.92rem;
    }
    .footer-qr-wrap {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 8px;
    }
    .footer-qr-wrap img {
      width: 110px;
      height: 110px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      padding: 4px;
      background: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid #f1f5f9;
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 悬浮工具栏 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.2rem;
      transition: var(--transition);
    }
    .floating-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.08);
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .hero-stats { grid-template-columns: repeat(2, 1fr); }
      .hero-stat-item:nth-child(2) { border-right: none; }
    }

    @media (max-width: 768px) {
      .mobile-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show { display: flex; }
      .nav-links li { width: 100%; }
      .nav-links a { padding: 12px 0; border-bottom: 1px solid #f8fafc; }
      .header-actions { display: none; }
      
      .hero-title { font-size: 2rem; }
      .hero-subtitle { font-size: 1rem; }
      .grid-2, .grid-3, .grid-4, .media-card-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .form-section-wrap { padding: 24px; }
      .eval-highlight-box { flex-direction: column; align-items: flex-start; }
    }