/* 全局变量与缤纷糖果亮色风设计规范 */
    :root {
      --primary-color: #ff5b79;
      --primary-hover: #ff3358;
      --secondary-color: #7b42f6;
      --accent-cyan: #00d2d3;
      --accent-yellow: #ff9f43;
      --accent-green: #10ac84;
      --text-main: #222f3e;
      --text-muted: #576574;
      --bg-light: #fafbff;
      --bg-card: #ffffff;
      --border-color: #eef2f7;
      --candy-gradient: linear-gradient(135deg, #ff5b79 0%, #ff793f 50%, #7b42f6 100%);
      --candy-soft-bg: linear-gradient(180deg, #fff5f7 0%, #f7f3ff 50%, #f0faff 100%);
      --shadow-sm: 0 4px 12px rgba(123, 66, 246, 0.06);
      --shadow-md: 0 10px 30px rgba(123, 66, 246, 0.1);
      --shadow-lg: 0 18px 45px rgba(255, 91, 121, 0.15);
      --radius-lg: 20px;
      --radius-md: 12px;
      --radius-pill: 50px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      background-image: var(--candy-soft-bg);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    /* 统一居中主容器 */
    .ai-container {
      width: 100%;
      max-width: 1240px;
      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(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(238, 242, 247, 0.8);
      box-shadow: 0 2px 15px rgba(0, 0, 0, 0.03);
    }

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

    .brand-box {
      display: flex;
      align-items: center;
      text-decoration: none;
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      color: var(--text-main);
      text-decoration: none;
      font-size: 15px;
      font-weight: 600;
      padding: 8px 14px;
      border-radius: var(--radius-pill);
      transition: all 0.25s ease;
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--primary-color);
      background: rgba(255, 91, 121, 0.08);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 700;
      text-decoration: none;
      border-radius: var(--radius-pill);
      transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
      border: 1px solid transparent;
      cursor: pointer;
    }

    .btn-candy {
      background: var(--candy-gradient);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(255, 91, 121, 0.35);
    }

    .btn-candy:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(255, 91, 121, 0.45);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      color: var(--secondary-color);
      border-color: rgba(123, 66, 246, 0.3);
    }

    .btn-outline:hover {
      background: rgba(123, 66, 246, 0.05);
      border-color: var(--secondary-color);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* 模块通用样式 */
    .section-padding {
      padding-top: 80px;
      padding-bottom: 80px;
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      background: rgba(255, 91, 121, 0.1);
      color: var(--primary-color);
      border-radius: var(--radius-pill);
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 34px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 首屏 Hero（严禁出现图片，采用糖果亮色渐变与几何交互卡片） */
    .hero-section {
      padding: 70px 0 90px 0;
      position: relative;
      overflow: hidden;
    }

    .hero-wrapper {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

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

    .hero-eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 18px;
      background: #ffffff;
      border: 1px solid rgba(255, 121, 63, 0.25);
      border-radius: var(--radius-pill);
      font-size: 13px;
      font-weight: 700;
      color: #ff793f;
      box-shadow: var(--shadow-sm);
      margin-bottom: 20px;
    }

    .hero-eyebrow-dot {
      width: 8px;
      height: 8px;
      background: #10ac84;
      border-radius: 50%;
      box-shadow: 0 0 8px #10ac84;
    }

    .hero-title {
      font-size: 44px;
      font-weight: 900;
      line-height: 1.25;
      color: #1a202c;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title .highlight-text {
      background: var(--candy-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtext {
      font-size: 17px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 35px;
    }

    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 35px;
    }

    .hero-buttons .btn {
      padding: 14px 32px;
      font-size: 16px;
    }

    .hero-stats-inline {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
      padding-top: 25px;
      border-top: 1px solid rgba(238, 242, 247, 0.9);
    }

    .hero-stat-item {
      display: flex;
      flex-direction: column;
    }

    .hero-stat-value {
      font-size: 22px;
      font-weight: 800;
      color: var(--secondary-color);
    }

    .hero-stat-label {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Hero 右侧纯 CSS 结构化视觉卡盘（无图片） */
    .hero-visual-card {
      background: #ffffff;
      border: 1px solid rgba(238, 242, 247, 0.8);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

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

    .hero-visual-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
    }

    .hero-visual-status {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      font-weight: 600;
      color: #10ac84;
      background: rgba(16, 172, 132, 0.1);
      padding: 4px 10px;
      border-radius: var(--radius-pill);
    }

    .model-pills-matrix {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-bottom: 20px;
    }

    .model-pill {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 10px 8px;
      text-align: center;
      font-size: 12px;
      font-weight: 700;
      color: var(--text-main);
      transition: all 0.25s ease;
    }

    .model-pill:hover {
      border-color: var(--primary-color);
      background: #fff5f7;
      color: var(--primary-color);
      transform: translateY(-2px);
    }

    .engine-stream-box {
      background: #f8fafc;
      border-radius: var(--radius-md);
      padding: 14px;
      border-left: 4px solid var(--secondary-color);
    }

    .stream-line {
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      margin-bottom: 6px;
      color: var(--text-muted);
    }

    .stream-line:last-child {
      margin-bottom: 0;
    }

    .stream-line strong {
      color: var(--text-main);
    }

    /* 场景卡片网格 */
    .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: 30px;
    }

    .candy-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 30px 26px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .candy-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: rgba(255, 91, 121, 0.3);
    }

    .card-icon {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(255, 91, 121, 0.15) 0%, rgba(123, 66, 246, 0.15) 100%);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 20px;
    }

    .candy-card h3 {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .candy-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 16px;
    }

    .card-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .card-tag {
      font-size: 12px;
      padding: 4px 10px;
      background: #f1f2f6;
      color: #576574;
      border-radius: 6px;
    }

    /* 平台核心介绍区域 */
    .about-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      margin-bottom: 30px;
    }

    .about-highlights {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .about-hl-item {
      padding: 20px;
      background: var(--bg-light);
      border-radius: var(--radius-md);
      border-left: 4px solid var(--primary-color);
    }

    .about-hl-item h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .about-hl-item p {
      font-size: 13px;
      color: var(--text-muted);
    }

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

    .step-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      position: relative;
    }

    .step-number {
      width: 44px;
      height: 44px;
      background: var(--candy-gradient);
      color: #ffffff;
      font-size: 18px;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 18px auto;
    }

    .step-card h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 对比评测表格 */
    .rating-banner {
      background: linear-gradient(135deg, #7b42f6 0%, #ff5b79 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 30px 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      box-shadow: var(--shadow-md);
    }

    .rating-score-box {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }

    .rating-num {
      font-size: 48px;
      font-weight: 900;
      line-height: 1;
    }

    .rating-max {
      font-size: 18px;
      opacity: 0.9;
    }

    .rating-stars {
      color: #ffd32a;
      font-size: 20px;
      letter-spacing: 2px;
    }

    .comparison-table-wrapper {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      overflow-x: auto;
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .comparison-table th,
    .comparison-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }

    .comparison-table th {
      background: #f8fafc;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .comparison-table td {
      font-size: 14px;
      color: var(--text-muted);
    }

    .comparison-table tr:hover td {
      background: #fafbff;
    }

    .col-highlight {
      background: #fff8f9;
      color: var(--text-main);
      font-weight: 600;
    }

    .table-check {
      color: #10ac84;
      font-weight: 800;
    }

    .table-cross {
      color: #ff5b79;
    }

    /* 案例展示区与真实图片组 */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 30px;
    }

    .case-item {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .case-item:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .case-img-wrap {
      width: 100%;
      overflow: hidden;
      background: #f1f2f6;
    }

    .case-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s ease;
    }

    .case-item:hover .case-img-wrap img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 22px;
    }

    .case-info h4 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .case-info p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 客户评价板块 */
    .testimonial-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 26px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-quote {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }

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

    .avatar-placeholder {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--candy-gradient);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
    }

    .user-info h5 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-info span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }

    .faq-item:hover {
      border-color: rgba(255, 91, 121, 0.4);
    }

    .faq-question {
      padding: 18px 22px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

    .faq-icon {
      font-size: 18px;
      color: var(--primary-color);
      transition: transform 0.3s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 22px 18px 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }

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

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

    /* 表单与联系模块 */
    .form-section-wrapper {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      padding: 40px;
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      font-size: 14px;
      color: var(--text-main);
      background: #fafbff;
      transition: all 0.25s ease;
      outline: none;
    }

    .form-control:focus {
      border-color: var(--primary-color);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(255, 91, 121, 0.15);
    }

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

    .contact-info-card {
      background: #fafbff;
      border-radius: var(--radius-md);
      padding: 30px;
      border: 1px solid var(--border-color);
    }

    .contact-info-card h4 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .contact-item-list {
      list-style: none;
      margin-bottom: 24px;
    }

    .contact-item-list li {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .qr-container {
      text-align: center;
      padding: 16px;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      display: inline-block;
    }

    .qr-container img {
      width: 130px;
      height: 130px;
      display: block;
      margin: 0 auto 8px auto;
    }

    .qr-container span {
      font-size: 12px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 文章列表与资讯 */
    .article-link-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 15px;
    }

    .article-chip {
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-pill);
      font-size: 13px;
      color: var(--secondary-color);
      text-decoration: none;
      font-weight: 600;
      transition: all 0.25s ease;
    }

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

    /* 友情链接与页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px 0;
      color: var(--text-muted);
      font-size: 14px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h5 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 18px;
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col ul li a {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s;
    }

    .footer-col ul li a:hover {
      color: var(--primary-color);
    }

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }

    .friend-links-wrap a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 13px;
      background: #f1f2f6;
      padding: 4px 10px;
      border-radius: 6px;
      transition: all 0.2s;
    }

    .friend-links-wrap a:hover {
      color: var(--primary-color);
      background: rgba(255, 91, 121, 0.1);
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 25px;
      text-align: center;
      font-size: 13px;
      color: #8395a7;
    }

    /* 悬浮客服面板 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      border: 1px solid var(--border-color);
      font-weight: 800;
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .float-btn:hover {
      background: var(--candy-gradient);
      color: #ffffff;
      transform: scale(1.1);
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .hero-wrapper {
        grid-template-columns: 1fr;
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-chain {
        grid-template-columns: repeat(2, 1fr);
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .about-highlights {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .site-header {
        position: relative;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        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 a {
        width: 100%;
        padding: 10px 0;
      }
      .header-actions {
        display: none;
      }
      .hero-title {
        font-size: 30px;
      }
      .section-title {
        font-size: 26px;
      }
      .grid-3, .grid-4, .grid-2, .case-gallery-grid {
        grid-template-columns: 1fr;
      }
      .step-chain {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        text-align: center;
        gap: 15px;
      }
      .rating-score-box {
        justify-content: center;
      }
    }