/* 组件样式：按钮、搜索框、面包屑、内容区等 */
.shortcut-hint {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    gap: 2px;
    opacity: 0.7;
    pointer-events: none;
}
.shortcut-hint span {
    background: var(--button-bg);
    color: var(--text-color);
    padding: 2px 4px;
    border-radius: 3px;
    font-size: 12px;
}
#search-input:not(:placeholder-shown) ~ .shortcut-hint {
    opacity: 0;
    transition: opacity var(--duration-base) var(--ease-default);
}
.search-container {
    display: flex;
    align-items: center;
    z-index: 999;
    white-space: nowrap;
    user-select: none;
    height: calc(1rem + 16px + 6px);
    will-change: transform;
    contain: layout;
    outline: none;
    backface-visibility: hidden;
    overflow: visible;
    
    /* 添加左侧空白补偿，与主页按钮宽度匹配 */
    padding-left: calc(1rem + 15px + 6px + 5px);
}
.search-input-wrapper {
    position: relative;
    display: inline-block;
}

#search-input {
    padding: 6px;
    padding-right: 56px;
    font-size: 1rem;
    border: 2px solid #a4d1c4;
    border-radius: 8px;
    width: 200px;
    max-width: calc(100vw - 120px);
    box-sizing: border-box;
    background: var(--bg-color);
    color: var(--text-color);
    user-select: text;
    font-family: 'DingTalk JinBuTi', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-synthesis: none;
    outline: none;
}
#search-input::placeholder {
    font-family: 'DingTalk JinBuTi', sans-serif;
    color: var(--text-color);
    opacity: 0.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-synthesis: none;
}
/* 搜索框悬停效果 - 仅在PC端生效 */
@media (hover: hover) and (pointer: fine) {
    #search-input:hover {
        border-color: var(--link-color);
        box-shadow: var(--shadow-sm);
        transform: scale(1.02);
    }
}

/* 非PC端搜索框点击效果 - 使用:active替代:hover */
@media not all and (hover: hover) and (pointer: fine) {
    #search-input:active {
        border-color: var(--link-color);
        box-shadow: var(--shadow-sm);
    }
}

/* 搜索框键盘聚焦样式 */
#search-input:focus-visible {
    border-color: var(--link-color);
    box-shadow: var(--shadow-sm);
    transform: scale(1.02);
}
/* 面包屑导航 */
#breadcrumbs {
    font-weight: bold;
    margin-bottom: 1rem;
    padding: 60px 0 0 0;
    font-size: 1.5rem;
    white-space: normal;
    overflow-x: visible;
    user-select: none;
    opacity: 0;
    animation: slideDown 0.3s ease forwards;
    outline: none;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    transition: mask-image 0.3s ease, -webkit-mask-image 0.3s ease;
    /* 防止布局偏移 */
    contain: layout style;
}
.breadcrumb-item {
    cursor: pointer;
    color: var(--link-color);
    padding: 8px 8px;
    border-radius: 4px;
    display: inline-block;
    margin: 0 4px 4px 0;
    user-select: none;
    transition: background var(--duration-base) var(--ease-default), transform var(--duration-base) var(--ease-default), box-shadow var(--duration-base) var(--ease-default), text-decoration var(--duration-base) var(--ease-default);
    outline: none;
    will-change: transform, background;
    border: none;
    background: transparent;
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
}

/* 重置button默认样式 */
button.breadcrumb-item {
    appearance: none;
    line-height: normal;
    margin: 0 4px 4px 0;
    min-height: 24px;
}
/* 面包屑悬停效果 - 仅在PC端生效 */
@media (hover: hover) and (pointer: fine) {
    .breadcrumb-item:hover {
        background: var(--hover-bg);
        box-shadow: var(--shadow-sm);
        transform: scale(1.05);
        text-decoration: underline;
    }
}
.breadcrumb-separator {
    color: var(--text-color);
    margin: 0 4px;
    user-select: none;
}
.breadcrumb-item:last-child {
    color: var(--text-color);
    font-weight: bold;
    cursor: default;
}
.breadcrumb-item:last-child:hover {
    background: transparent;
    text-decoration: none;
}
/* 滚动提示样式 */
#breadcrumbs.scrollable:not(.at-end)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    background: linear-gradient(to right, transparent, var(--bg-color));
    pointer-events: none;
    opacity: 0.8;
}

#breadcrumbs.scrollable:not(.at-start)::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    background: linear-gradient(to left, transparent, var(--bg-color));
    pointer-events: none;
    opacity: 0.8;
    z-index: 1;
}

/* 内容区 */
#content {
    transition: transform var(--duration-base) var(--ease-in-out-cubic);
}

/* 移动端内容布局 */
#content.mobile-content-layout {
    margin-left: 0;
    width: 100%;
    max-width: 600px;
    position: relative;
    padding-left: 5px; /* 增加一点左侧内边距 */
    /* 移除导致元素扩散的transform和left */
}

#content .folder,
#content .bookmark {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 1.2rem 0;
    padding: 0.25rem 0.5rem;
    opacity: 0;
    animation: fadeInUp 0.3s ease forwards;
    animation-delay: calc(var(--item-index, 0) * 0.05s);
    will-change: transform;
    outline: none;
    box-sizing: border-box;
    /* 防止布局偏移 */
    contain: layout;
}
#content .folder {
    user-select: none;
    -webkit-user-drag: none;
    -webkit-touch-callout: none;
    backface-visibility: hidden;
    transform: translateZ(0);
    transition: transform var(--duration-base) var(--ease-default), background var(--duration-base) var(--ease-in-out-cubic), box-shadow var(--duration-base) var(--ease-default);
    width: fit-content;
    /* 保留最小占位，减少动态渲染/懒加载引起的布局偏移 */
    min-width: 120px;
    min-height: 32px;
}
/* 文件夹悬停效果 - 仅在PC端生效 */
@media (hover: hover) and (pointer: fine) {
    #content .folder:hover {
        transform: translateY(-1px);
        cursor: pointer;
    }
    
    #content .folder:hover .folder-name {
        color: var(--link-color);
        text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
        box-shadow: var(--shadow-sm);
    }
    
    #content .bookmark:hover {
        transform: translateY(-1px);
    }
    
    #content .bookmark a:hover {
        color: var(--link-color);
        box-shadow: var(--shadow-sm);
    }
    
    .github-link:hover {
        transform: scale(1.1);
        color: var(--link-color);
    }
}
#content .folder .folder-name {
    font-size: 1.0rem;
    padding: 0.25rem 0.5rem;
    cursor: pointer;
    transition: all var(--duration-base) var(--ease-default);
    border-radius: 4px;
}

#content .bookmark {
    transition: transform var(--duration-short) var(--ease-default);
}

#content .bookmark .bookmark-icon {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    transition: transform 0.2s ease;
    will-change: transform;
    width: 16px;
    height: 16px;
    font-size: 16px;
    line-height: 1;
}
#content .bookmark .bookmark-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    vertical-align: middle;
    transition: opacity 0.3s ease;
    /* 保留占位并避免在加载完成时通过移动 DOM 引起位移 */
    display: block;
    min-width: 16px;
    min-height: 16px;
    box-sizing: border-box;
}
#content .bookmark a {
    color: var(--text-color);
    text-decoration: none;
    display: inline-block;
    padding: 0.25rem 0.5rem;
    max-width: calc(100% - 16px - 8px);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    user-select: text;
    font-size: 1.0rem;
    transition: color 0.15s ease, box-shadow 0.15s ease;
    border-radius: 4px;
}

/* GitHub链接按钮样式 */
.github-link {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 999;
    color: var(--text-color);
    display: flex;
    align-items: center;
    transition: transform 0.2s, color 0.2s;
}

/* 主页消息字体与颜色 */
.home-message .chinese-text {
    font-family: 'DingTalk JinBuTi', sans-serif;
    color: var(--text-color);
}
.home-message .english-text {
    font-family: 'DingTalk JinBuTi', sans-serif;
    color: var(--link-color);
}
.home-message .chinese-text {
    font-size: 3rem;
}
.home-message .english-text {
    font-size: 2rem;
}
/* 主页消息基础样式 */
.home-message {
    font-weight: bold;
    text-align: center;
    user-select: none;
    opacity: 0;
    perspective: 1000px;
    transform-style: preserve-3d;
    will-change: opacity, transform;
    content-visibility: auto;
    outline: none;
}

/* 内容区文件夹聚焦样式 */
#content .folder:focus-visible {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(43, 195, 206, 0.2);
    border-radius: 4px;
}

/* 面包屑导航聚焦样式 */
button.breadcrumb-item:focus-visible {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(43, 195, 206, 0.2);
    border-radius: 4px;
}

/* 加载指示器样式 */
.loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    /* 保留占位，避免首次渲染时高度不足导致 CLS */
    min-height: 80px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--hover-bg);
    border-top: 4px solid var(--link-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* 居中消息基类 - 使用统一居中系统 */
.centered-message {
    z-index: 10;
    text-align: center;
    color: var(--text-color);
}

.error-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
}

.no-results {
    width: 90%;
    max-width: 400px;
    font-size: 1.1rem;
    opacity: 0.8;
    font-weight: bold;
    top: 45%;
}

/* 搜索结果相关样式 */
.results-container {
    position: relative;
    min-height: calc(100vh - 50px);
    padding-bottom: 2rem; /* 底部留些空间 */
}

/* 移动端减少底部间距 */
@media screen and (max-width: 479px) {
    .results-container {
        padding-bottom: 0.5rem; /* 移动端大幅减少底部间距 */
    }
}

/* 搜索结果项目样式 */
.search-result-item {
    opacity: 0;
    animation: fadeInUp 0.15s ease-out forwards;
    margin-bottom: 0.5rem;
}

.search-result-item:focus-visible {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(43, 195, 206, 0.2);
    border-radius: 4px;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}