/* base.css - 网站骨架与布局 (Structure Only) */

/* =========================================
   0. SMOOTH TRANSITION (防卡顿优化)
   ========================================= */
body, 
.navbar, 
.card, 
.gallery-item, 
.footer-text,
.main-title,
a, 
p, 
h1, h2, h3, h4, h5, h6,
div {
    /* 让颜色和背景色的变化产生 0.4秒 的平滑过渡 */
    transition: background-color 0.4s ease, color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

/* 注意：某些特定元素（如图片悬停、轮播图）的 transition 可能会被这个覆盖，
   但我们在 theme-jazz.css 里定义的具体 transition 优先级更高，所以没问题。 */

/* ... (保留原来 Section 1 Global Layout 及之后的所有内容) ... */
/* =========================================
   1. Global Layout & Structure
   ========================================= */
/* 基础重置与盒模型已由 Bootstrap 处理，这里只处理自定义结构 */

/* 文本容器布局 */
.lead-text {
    /* 仅保留对齐方式和行高结构，字号/颜色移至主题 */
    text-align: justify;
    line-height: 1.7; 
}

.lead-text p {
    margin-bottom: 1rem;
}

/* 页面顶部标题区结构 */
.page-header-section {
    padding: 60px 0 40px 0;
    text-align: center;
    margin-bottom: 40px;
    /* 边框颜色移至主题 */
    border-bottom: 1px solid transparent; 
}

/* 装饰性标签结构（左侧线条布局） */
.section-label {
    padding-left: 12px;
    border-left: 3px solid transparent; /* 颜色由主题定义 */
    display: inline-block;
}

/* =========================================
   2. Navbar Structure
   ========================================= */
.navbar {
    padding: 1.2rem 0;
    border-bottom: 1px solid transparent;
}

/* 导航链接布局 */
.nav-link {
    padding-left: 1rem !important;
    padding-right: 1rem !important;
    transition: color 0.3s ease; /* 过渡效果属于交互体验，可留在此处或移至主题 */
}

.dropdown-menu {
    padding: 15px 0;
    margin-top: 10px;
    min-width: 180px;
    border: 1px solid transparent;
}

.dropdown-toggle::after {
    display: inline-block;
    margin-left: 0.4em;
    vertical-align: 0.1em;
    content: "▾";
    border: none;
    font-size: 0.8em;
}

.dropdown-item {
    padding: 8px 24px;
    transition: all 0.2s ease;
}

/* =========================================
   3. Component Layouts (Buttons, Cards)
   ========================================= */
/* 按钮基础结构：内边距、行内块显示 */
.btn-custom-primary,
.btn-custom-outline,
.btn-browse-custom,
.view-more-btn,
.gallery-nav-btn {
    padding: 10px 30px;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    border: 1px solid transparent; /* 占位，颜色由主题定 */
}

/* 浏览收藏按钮特殊布局 */
.btn-browse-custom {
    padding: 12px 28px;
}

/* 返回顶部按钮定位 */
#btn-back-to-top {
    position: fixed; 
    bottom: 30px; 
    right: 30px; 
    display: none; 
    z-index: 1000;
    width: 50px; 
    height: 50px; 
    align-items: center; 
    justify-content: center; 
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
}

/* =========================================
   4. Image & Gallery Structure
   ========================================= */
/* 首页图片框结构 */
.image-frame {
    position: relative;
    overflow: hidden;
}

.carousel-item img {
    width: 100%;
    height: 520px; 
    object-fit: cover;
    transition: transform 0.8s ease; /* 动画属性也可以移至主题，视需求而定 */
}

.carousel-link-area { 
    display: block; 
    position: relative; 
    cursor: pointer; 
}

/* 悬停遮罩层定位 */
.hover-overlay {
    position: absolute; 
    top: 0; left: 0; width: 100%; height: 100%;
    display: flex; 
    align-items: center; 
    justify-content: center;
    opacity: 0; 
    transition: opacity 0.4s ease; 
    z-index: 2;
}

/* 轮播箭头定位 */
.carousel-control-prev, .carousel-control-next {
    width: 10%; 
    opacity: 0; 
    transition: opacity 0.3s; 
    z-index: 10;
}

/* Collection 页面网格结构 */
.gallery-container {
    display: flex;
    flex-wrap: wrap;
    padding: 20px;
    gap: 15px;
    max-width: 1200px;
    margin: 0 auto;
}

.gallery-column {
    flex: 1; 
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.gallery-item {
    position: relative;
    overflow: hidden;
}

.gallery-item img {
    width: 100%;
    display: block;
    transition: transform 0.5s ease;
    
}
/* --- 补充缺失的 Overlay 结构 --- */
.item-overlay {
    position: absolute; /* 关键：让它浮在图片上，而不是排在下面 */
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px 15px;
    
    /* 默认隐藏 */
    opacity: 0; 
    transition: opacity 0.3s ease;
    
    /* 内容居中布局 */
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    
    /* 确保层级高于图片 */
    z-index: 2; 
}

/* 鼠标悬停时显示 */
.gallery-item:hover .item-overlay {
    opacity: 1;
}

/* Gallery 详情页图片框结构 */
.gallery-image-frame {
    padding: 10px;
    height: 400px; 
    overflow: hidden; 
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: grab;
    border: 1px solid transparent;
}

.gallery-image-frame img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain; 
    transition: transform 0.1s ease-out; 
    transform-origin: center center;
}

/* 表格结构 */
.table th { width: 35%; }

/* =========================================
   5. Map Page Structure
   ========================================= */
.map-wrapper {
    padding: 40px 20px;
    position: relative;
    border: 1px solid transparent;
}

svg { width: 100%; height: auto; max-height: 400px; overflow: visible; }

.map-point { cursor: pointer; transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); }

.info-panel { 
    padding-left: 40px; 
    display: flex; 
    flex-direction: column; 
    justify-content: center; 
    height: 100%; 
    border-left: 1px solid transparent; 
}

.info-category { 
    margin-bottom: 15px; 
    display: flex; 
    align-items: center; 
    gap: 10px; 
}
.info-category::before { 
    content: ''; 
    display: block; 
    width: 20px; 
    height: 1px; 
}

.info-image-wrapper {
    width: 100%;
    height: 180px; 
    overflow: hidden;
    margin-bottom: 20px; 
    position: relative;
    display: flex; 
    align-items: center; 
    justify-content: center;
}

.info-image-wrapper img {
    width: 100%; height: 100%; 
    object-fit: contain; object-position: center;
    padding: 5px;
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.narrative-toggle {
    background: none; border: none; padding: 8px 0;
    display: inline-flex; align-items: center; gap: 6px; 
    transition: color 0.3s;
}

.filter-menu { padding: 15px 0; margin-top: 10px !important; min-width: 220px; border: none; }
.filter-header { padding: 10px 24px 5px 24px; background: transparent; }
.filter-item { padding: 8px 24px; transition: all 0.2s; position: relative; }
.btn-view-all { border: none; background: none; padding: 0; margin-right: 15px; border-bottom: 1px solid transparent; transition: all 0.3s; }

/* =========================================
   6. Footer Structure
   ========================================= */
.site-footer {
    padding: 4rem 0; 
    margin-top: 8rem;
    border-top: 1px solid transparent;
}
.footer-logo img { max-height: 90px; width: auto; }
.footer-text .small { margin-top: 1rem; }

/* =========================================
   7. Utility Classes (Structure)
   ========================================= */
.mw-700-center { max-width: 700px; margin: 0 auto; }

/* 响应式布局调整 */
@media (max-width: 991px) {
    .navbar-collapse { padding: 20px; margin-top: 10px; }
    .info-panel { border-left: none; padding-left: 0; margin-top: 40px; padding-top: 20px; border-top: 1px solid transparent; }
    .gallery-image-frame { height: 300px; }
}
@media (max-width: 768px) {
    .site-footer { 
        text-align: center; 
        margin-top: 10rem !important; /* ★★★ 强制在窄屏下把 footer 往更下面推 ★★★ */
        padding-top: 3rem;
    } 
    
    .gallery-column { 
        flex: 100%; 
    }

    /* 之前加的这个也可以保留，双重保险 */
    .gallery-container {
        margin-bottom: 80px; 
    }
}

/* base.css - 网站骨架与布局 (Structure Only) */

/* ... (保留原有的 Section 1-7 内容) ... */

/* =========================================
   8. About Us Page Structure
   ========================================= */

.about-container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 20px;
}

.team-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center; 
    gap: 30px; 
}

.member-card {
    width: 280px; 
    display: flex;
    flex-direction: column;
    position: relative;
    border: 1px solid transparent; 
    /* 关键：限制图片放大溢出 */
    overflow: hidden; 
}

.member-card img {
    width: 100%;
    aspect-ratio: 1 / 1; 
    object-fit: cover;
    display: block;
    /* 动画在 theme 里定义 */
}

.member-info {
    padding: 25px 20px;
    text-align: left; 
    position: relative; 
    z-index: 1;
}

.member-info h3 {
    margin-top: 0;
    margin-bottom: 0.2rem;
    line-height: 1.2;
}

.member-info p {
    margin-bottom: 0;
}

/* 链接区域布局 */
.member-info .links {
    margin-top: 15px; 
    display: flex;
    flex-direction: column;
    gap: 6px;
}

/* =========================================
   9. Disclaimer Page Structure
   ========================================= */

.source-list {
    list-style: disc; 
    padding-left: 20px; 
    margin: 0;
}

.source-list li {
    margin-bottom: 8px; 
    border: none;
    padding-bottom: 0;
}

.source-link {
    display: inline;
    text-decoration: underline;
}

/* ★★★ 新增：版权声明结构 ★★★ */
.copyright-notice {
    margin-top: 3rem;      /* 顶部大间距 */
    padding-top: 1.5rem;   /* 分割线到文字的距离 */
    border-top: 1px solid transparent; /* 边框结构，颜色由主题定 */
}

/* =========================================
   10. Documentation Page Structure
   ========================================= */

/* 侧边栏布局 */
.doc-sidebar {
    top: 100px; /* 距离顶部导航栏的距离 */
    padding-right: 20px;
}

/* 侧边栏链接结构 */
.doc-nav-link {
    display: block;
    padding: 8px 0;
    text-decoration: none;
    border-left: 2px solid transparent; /* 左侧指示条占位 */
    padding-left: 15px;
}

.doc-nav-sublink {
    display: block;
    padding: 5px 0;
    text-decoration: none;
    font-size: 0.9em;
    border-left: 2px solid transparent;
    padding-left: 15px;
}

/* 内容区域分割线 */
.doc-divider {
    margin: 3rem 0;
    border: 0;
    border-top: 1px solid transparent; /* 颜色由主题定 */
    opacity: 0.1;
}

/* =========================================
   1. Global Layout & Structure (微调)
   ========================================= */
.lead-text {
    /* ★★★ 统一调整：增加行高，提升阅读舒适度 ★★★ */
    text-align: justify;
    line-height: 1.8; 
    margin-bottom: 1.5rem;
}

.lead-text p {
    margin-bottom: 1rem;
}

/* Narratives 页面头部描述专用容器 (继承 lead-text 但可微调) */
.page-header-section .lead-text {
    max-width: 800px;
    margin: 0 auto;
    text-align: center; /* 头部通常居中 */
}



/* =========================================
   11. NARRATIVES PAGE SPECIAL STYLES
   ========================================= */

/* 1. 时间轴布局 */
.timeline-container {
    position: relative;
    padding: 10px 0;
    margin-left: 180px; 
    border-left: 4px solid transparent; /* 颜色由主题定 */
}

.timeline-item {
    position: relative;
    padding-left: 50px;
    padding-bottom: 100px; 
    margin: 0;
}
.timeline-item:last-child { padding-bottom: 20px; }

/* 节点圆点 */
.timeline-item::before {
    content: "";
    position: absolute;
    left: -14px; top: 12px; /* 保持与标题对齐 */
    width: 24px; height: 24px;
    border-radius: 50%;
    z-index: 5;
}

/* 年份/阶段标题 (The Rule...) */
.timeline-year {
    position: absolute;
    left: -190px; 
    top: 8px; /* 垂直定位，与图片顶部视觉对齐 */
    width: 160px; 
    text-align: right;
    line-height: 1.2;
}

/* --- 2. 卡片与图片修复 --- */
.narrative-card {
    border: none !important;
    background: transparent !important;
    box-shadow: none !important;
}
.narrative-card a { text-decoration: none !important; color: inherit; }

.card-img-wrapper {
    position: relative;
    overflow: hidden;
    border-radius: 4px;
    /* ★★★ 微调：让图片整体下移一点，与左侧标题对齐 ★★★ */
    margin-top: 5px; 
}

/* 图片尺寸控制 (4:3) */
.narrative-card .carousel-item img {
    width: 100%;
    height: 400px; 
    object-fit: cover; 
    object-position: center center;
}

/* --- 3. 遮罩链接层级 --- */
.carousel-item { position: relative; }

.item-link-overlay {
    position: absolute;
    inset: 0;           
    z-index: 15;        
    display: block;
    cursor: pointer;
}

/* 遮罩条布局 */
.overlay-bar {
    position: absolute;
    left: 0;
    bottom: -100%;      
    width: 100%;
    height: auto;       
    min-height: 30%;    
    padding: 15px 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none; 
}

.carousel-item:hover .overlay-bar { bottom: 0; }

/* base.css */
.overlay-text{
  color: var(--overlay-text, #fff) !important;
  font-family: var(--overlay-font, var(--font-heading));
  font-size: var(--overlay-fs, 0.9rem);
  letter-spacing: var(--overlay-ls, 1px);
  font-weight: var(--overlay-fw, 600);
  text-align: center;
}

/* 轮播控制按钮 */
.carousel-control-prev, 
.carousel-control-next { z-index: 25 !important; }

.card-img-wrapper .carousel-control-prev,
.card-img-wrapper .carousel-control-next {
  opacity: 0;
  width: 12%; 
}

.card-img-wrapper:hover .carousel-control-prev,
.card-img-wrapper:hover .carousel-control-next {
  opacity: 1;
}

/* 下划线装饰布局 */
.theme-subtitle {
    display: inline-block;
    position: relative;
    padding-bottom: 8px;
    margin-bottom: 15px;
}
.theme-subtitle::after {
    content:"";
    position:absolute;
    left:0;
    bottom:0;
    width: 40px;
    height: 3px;
    border-radius: 2px;
}

/* =========================================
   FIX: Mobile Narrative Timeline Layout
   ========================================= */

@media (max-width: 991px) {
    /* 1. 取消整体容器的左侧巨大留白，改为紧凑布局 */
    .timeline-container {
        margin-left: 20px; /* 从 180px 改为 20px */
        border-left: 3px solid transparent; /* 保持线条，颜色由主题决定 */
        padding-left: 25px; /* 线条与内容之间的距离 */
        padding-right: 15px; /* 防止右侧贴边 */
    }

    /* 2. 重置每一个时间节点的内边距 */
    .timeline-item {
        padding-left: 0; 
        padding-bottom: 60px; /* 增加底部间距，区分不同节点 */
    }

    /* 3. 标题(The Rule等)不再悬浮在左侧，而是变回到内容上方 */
    .timeline-year {
        position: relative; /* 关键：取消 absolute */
        left: 0;
        top: 0;
        width: 100%;
        text-align: left;
        margin-bottom: 15px;
        display: block;
        
        /* 稍微调大字号，使其像一个小标题 */
        font-size: 1.5rem; 
        font-weight: 700;
        color: var(--primary-color, inherit); /* 确保颜色可见 */
    }

    /* 4. 调整时间轴圆点的位置，使其对齐新的线条 */
    .timeline-item::before {
        left: -29px; /* 根据 padding-left: 25px 和 border 宽度微调 */
        top: 5px;   /* 微调垂直位置以对齐标题 */
    }

    /* 5. 修复文字挤压问题，确保 Lead Text 正常换行 */
    .col-lg-7 .lead-text {
        text-align: left; /* 手机上 justify 容易产生大空隙，建议 left */
        margin-top: 20px; /* 图片和文字拉开一点距离 */
    }
}

/* =========================================
   FIX: Mobile Homepage Buttons Layout
   ========================================= */

@media (max-width: 576px) {
    /* 1. 强制按钮容器垂直排列 */
    .content-wrapper .d-flex.gap-3 {
        flex-direction: column;
        gap: 15px !important; /* 强制增加垂直间距 */
    }

    /* 2. 让按钮占满宽度，方便手指点击 */
    .content-wrapper .btn-lg {
        width: 100%;
        display: block;
        text-align: center;
        margin-right: 0; /* 清除可能存在的右边距 */
    }
}