/* ==================== 全局变量 ==================== */
  :root {
    --tch-navy: #0F2137;
    --tch-navy-light: #1E3A5F;
    --tch-red: #B81D13;
    --tch-red-hover: #96150E;
    --tch-bg-gray: #F8F9FA;
    --tch-card-bg: #FFFFFF;
    --tch-text-main: #1A2B3C;
    --tch-text-muted: #5A6A7E;
    --tch-border: #E2E8F0;
    --tch-shadow-sm: 0 4px 12px rgba(15, 33, 55, 0.04);
    --tch-shadow-hover: 0 16px 32px rgba(15, 33, 55, 0.12);
  }

  /* ==================== 动画 ==================== */
  @keyframes tchPulse {
    0% { box-shadow: 0 0 0 0 rgba(184, 29, 19, 0.4); }
    70% { box-shadow: 0 0 0 8px rgba(184, 29, 19, 0); }
    100% { box-shadow: 0 0 0 0 rgba(184, 29, 19, 0); }
  }

  @keyframes tchFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
  }

  @keyframes tchFadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
  }

  /* 滚动进入动画（配合 IntersectionObserver） */
  .tch-reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .tch-reveal.tch-visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* ==================== 基础布局 ==================== */
  .tch-home-wrapper {
    width: 100%;
    max-width: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    color: var(--tch-text-main);
    background-color: var(--tch-bg-gray);
    padding: 0 0 60px;
    box-sizing: border-box;
    overflow-x: hidden;
    position: relative;
  }

  .tch-container {
    max-width: 1290px !important;
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
  }

  /* ==================== 通用按钮 ==================== */
  .tch-btn {
    display: inline-block;
    padding: 14px 28px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 15px;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  }
  .tch-btn-red {
    background: var(--tch-red);
    color: #fff !important;
  }
  .tch-btn-red:hover {
    background: var(--tch-red-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(184, 29, 19, 0.3);
  }
  .tch-btn-navy {
    background: var(--tch-navy);
    color: #fff !important;
  }
  .tch-btn-navy:hover {
    background: var(--tch-navy-light);
    transform: translateY(-2px);
  }
  .tch-btn-outline {
    border: 1.5px solid rgba(255, 255, 255, 0.6);
    color: #ffffff !important;
    background: rgba(15, 33, 55, 0.4);
    backdrop-filter: blur(4px);
  }
  .tch-btn-outline:hover {
    background: #ffffff;
    color: var(--tch-navy) !important;
    transform: translateY(-2px);
  }

  /* ==================== HERO 轮播区域 ==================== */
  .tch-hero-slider {
    position: relative;
    width: 100%;
    overflow: hidden;
    background: #0F2137;
  }
  .tch-slides-wrapper {
    display: flex;
    transition: transform 0.6s cubic-bezier(0.25, 1, 0.5, 1);
    width: 100%;
  }
  .tch-slide-item {
    min-width: 100%;
    position: relative;
    min-height: 580px;
    display: flex;
    align-items: center;
    padding: 80px 0 100px;
    box-sizing: border-box;
  }

  /* 第一屏 */
  .tch-slide-1 {
    background-color: #0F2137;
    position: relative;
  }
  .tch-slide-1-red-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 30%;
    height: 100%;
    background: #B81D13;
    clip-path: polygon(0 0, 100% 0, 30% 100%, 0 100%);
    z-index: 1;
  }
  .tch-slide-1-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    position: relative;
    z-index: 5;
  }
  .tch-slide-1-content {
    max-width: 560px;
  }
  .tch-slide-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(8px);
    color: #FFD166;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1.2px;
    border-radius: 20px;
    margin-bottom: 22px;
    text-transform: uppercase;
  }
  .tch-hero-title-slider {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.18;
    color: #ffffff;
    margin-top: 0.67em;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
  }
  .tch-hero-title-slider span {
    color: #FFD166;
  }
  .tch-hero-desc-slider {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.88);
    margin-bottom: 36px;
    line-height: 1.6;
  }
  .tch-slide-1-img-wrap {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
  }
  .tch-hero-illustration {
    max-width: 100%;
    height: auto;
    display: block;
    filter: drop-shadow(0 16px 32px rgba(0, 0, 0, 0.35));
    animation: tchFloat 5s ease-in-out infinite;
  }

  /* 第二屏 */
  .tch-slide-2 {
    background-image: linear-gradient(135deg, rgba(15, 33, 55, 0.92), rgba(184, 29, 19, 0.78)), url('https://thechinahelper.com/storage/2026/09/tch-home-slide2.webp');
    background-color: var(--tch-navy-light);
    background-size: cover;
    background-position: center;
  }
  .tch-slide-content-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 50px;
    align-items: center;
    position: relative;
    z-index: 2;
  }

  /* 轮播箭头 */
  .tch-slider-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: rgba(15, 33, 55, 0.45);
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 30;
    transition: all 0.3s;
    backdrop-filter: blur(6px);
    font-size: 18px;
  }
  .tch-slider-arrow:hover {
    background: var(--tch-red);
    border-color: var(--tch-red);
    transform: translateY(-50%) scale(1.08);
  }
  .tch-arrow-prev {
    left: 24px;
  }
  .tch-arrow-next {
    right: 24px;
  }

  /* ==================== 四个入口卡片 ==================== */
  .tch-entrance-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: -50px;
    margin-bottom: 70px;
    position: relative;
    z-index: 10;
  }
  .tch-entrance-card {
    background: #ffffff;
    padding: 28px 24px;
    border-radius: 16px;
    border: 1px solid var(--tch-border);
    box-shadow: 0 12px 28px rgba(15, 33, 55, 0.12);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
  }
  .tch-entrance-card:hover {
    border-color: var(--tch-red);
    transform: translateY(-6px);
    box-shadow: 0 20px 36px rgba(15, 33, 55, 0.18);
  }
  .tch-entrance-image {
    width: 100%;
    height: 150px;
    overflow: hidden;
    border-radius: 12px;
    margin-bottom: 18px;
  }
  .tch-entrance-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .5s ease;
  }
  .tch-entrance-card:hover .tch-entrance-image img {
    transform: scale(1.08);
  }
  .tch-entrance-card h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--tch-navy);
  }
  .tch-entrance-card p {
    font-size: 13px;
    color: var(--tch-text-muted);
    margin-top: 4px;
  }

  /* ==================== 通用内容区域 ==================== */
  .tch-section {
    padding: 40px 0;
  }
  .tch-section-header {
    text-align: center;
    margin-bottom: 44px;
  }
  .tch-section-title {
    font-size: 34px;
    font-weight: 800;
    color: var(--tch-navy);
    letter-spacing: -0.5px;
  }
  .tch-section-subtitle {
    color: var(--tch-text-muted);
    font-size: 16px;
    margin-top: 8px;
  }

  /* 三列网格卡片 */
  .tch-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }
  .tch-card {
    background: #fff;
    padding: 36px;
    border-radius: 16px;
    border: 1px solid var(--tch-border);
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.3s ease;
    box-shadow: var(--tch-shadow-sm);
  }
  .tch-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--tch-shadow-hover);
  }
  .tch-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--tch-red);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 12px;
    animation: tchPulse 2s infinite;
  }
  .tch-card h3 {
    font-size: 22px;
    color: var(--tch-navy);
    margin-bottom: 12px;
    font-weight: 700;
  }
  .tch-card p {
    color: var(--tch-text-muted);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 26px;
  }

  /* ==================== 中国生活指南卡片 ==================== */
  .tch-guide-card {
    background: #fff;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid var(--tch-border);
    transition: all 0.3s ease;
    box-shadow: var(--tch-shadow-sm);
  }
  .tch-guide-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--tch-shadow-hover);
  }
  .tch-guide-banner {
    height: 180px;
    overflow: hidden;
    background: var(--tch-navy);
  }
  .tch-guide-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .5s ease;
  }
  .tch-guide-card:hover .tch-guide-banner img {
    transform: scale(1.08);
  }
  .tch-guide-body {
    padding: 24px;
  }
  .tch-guide-tag {
    font-size: 11px;
    font-weight: 700;
    color: var(--tch-red);
    margin-bottom: 8px;
    letter-spacing: 0.8px;
  }
  .tch-guide-body h4 {
    font-size: 17px;
    color: var(--tch-navy);
    line-height: 1.4;
    font-weight: 700;
  }

  /* ==================== 图库（生活展示） ==================== */
  .tch-gallery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
  .tch-gallery-item {
    position: relative;
    border-radius: 14px;
    overflow: hidden;
    height: 220px;
    background: var(--tch-navy);
    cursor: pointer;
    border: 1px solid var(--tch-border);
  }
  .tch-gallery-bg {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .tch-gallery-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .5s ease;
  }
  .tch-gallery-item:hover .tch-gallery-bg img {
    transform: scale(1.08);
  }
  .tch-gallery-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(15, 33, 55, 0.88) 0%, rgba(15, 33, 55, 0.1) 60%);
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    color: #fff;
  }
  .tch-gallery-tag {
    font-size: 11px;
    font-weight: 700;
    color: #FFD166;
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }
  .tch-gallery-title {
    font-size: 16px;
    font-weight: 700;
    margin-top: 4px;
    line-height: 1.3;
  }

  /* ==================== 新闻/资源列表 ==================== */
  .tch-news-col {
    background: #fff;
    padding: 30px;
    border-radius: 16px;
    border: 1px solid var(--tch-border);
    box-shadow: var(--tch-shadow-sm);
  }
  .tch-news-cat-title {
    font-size: 19px;
    font-weight: 700;
    color: var(--tch-navy);
    border-bottom: 2px solid var(--tch-bg-gray);
    padding-bottom: 14px;
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .tch-news-list {
    list-style: none;
    margin: 0;
    padding: 0;
  }
  .tch-news-item {
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px dashed var(--tch-border);
  }
  .tch-news-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
  }
  .tch-news-link {
    text-decoration: none;
    font-size: 15px;
    color: var(--tch-text-main);
    font-weight: 600;
    line-height: 1.4;
    display: block;
    transition: color 0.2s;
  }
  .tch-news-link:hover {
    color: var(--tch-red);
  }
  .tch-news-date {
    font-size: 12px;
    color: var(--tch-text-muted);
    margin-top: 6px;
  }

  /* ==================== FAQ ==================== */
  .tch-faq-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }
  .tch-faq-item {
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--tch-border);
    overflow: hidden;
    transition: all 0.3s;
  }
  .tch-faq-item[open] {
    border-color: var(--tch-navy);
    box-shadow: var(--tch-shadow-sm);
  }
  .tch-faq-summary {
    padding: 20px 24px;
    font-size: 17px;
    font-weight: 700;
    color: var(--tch-navy);
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
  }
  .tch-faq-summary::-webkit-details-marker {
    display: none;
  }
  .tch-faq-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--tch-bg-gray);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: var(--tch-navy);
    transition: transform 0.3s;
  }
  .tch-faq-item[open] .tch-faq-icon {
    transform: rotate(180deg);
    background: var(--tch-red);
    color: #fff;
  }
  .tch-faq-content {
    padding: 0 24px 22px;
    color: var(--tch-text-muted);
    font-size: 15px;
    line-height: 1.6;
    border-top: 1px solid transparent;
  }
  .tch-faq-item[open] .tch-faq-content {
    border-top-color: var(--tch-bg-gray);
    padding-top: 16px;
  }

  /* ==================== 下载与咨询区域（左右分栏） ==================== */
  .tch-split-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    background: #fff;
    padding: 48px;
    border-radius: 20px;
    border: 1px solid var(--tch-border);
    box-shadow: var(--tch-shadow-sm);
  }
  .tch-form-group {
    margin-bottom: 18px;
  }
  .tch-form-group input,
  .tch-form-group textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--tch-border);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    box-sizing: border-box;
  }
  .tch-form-group select {
    width: 100% !important;
    height: 48px !important;
    line-height: 1.4 !important;
    padding: 10px 14px !important;
    font-size: 14px !important;
    border: 1px solid var(--tch-border) !important;
    border-radius: 8px !important;
    background-color: #fff !important;
    color: var(--tch-text-main) !important;
    box-sizing: border-box !important;
    outline: none;
  }
  .tch-form-group input:focus,
  .tch-form-group select:focus,
  .tch-form-group textarea:focus {
    border-color: var(--tch-navy) !important;
  }

  /* ==================== 响应式 ==================== */
  @media (max-width: 992px) {
    .tch-slide-1-grid,
    .tch-slide-content-grid,
    .tch-split-box {
      grid-template-columns: 1fr;
    }
    .tch-slide-1-red-bg {
      width: 100%;
      height: 25%;
      clip-path: none;
    }
    .tch-entrance-grid {
      margin-top: 30px;
      grid-template-columns: repeat(2, 1fr);
    }
    .tch-gallery-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .tch-grid-3 {
      grid-template-columns: 1fr;
    }
    .tch-hero-title-slider {
      font-size: 36px;
    }
    .tch-slide-item {
      min-height: 480px;
      padding: 50px 0 60px;
    }
  }

  @media (max-width: 600px) {
    .tch-entrance-grid,
    .tch-gallery-grid {
      grid-template-columns: 1fr;
    }
    .tch-slide-item {
      padding: 60px 0 70px;
    }
    .tch-hero-title-slider {
      font-size: 32px;
    }
    .tch-section-title {
      font-size: 28px;
    }
    .tch-split-box {
      padding: 28px 22px;
    }
    .tch-slider-arrow {
      width: 40px;
      height: 40px;
      font-size: 15px;
    }
    .tch-arrow-prev {
      left: 10px;
    }
    .tch-arrow-next {
      right: 10px;
    }
  }