/**
 * PDF查看器样式 - 优化版浮动工具栏
 * 工具栏只在PDF阅读区域内浮动，折叠按钮独立浮动在内容区右边
 */

/* PDF 激活状态下的全局布局调整 - 禁止外部容器滚动 */
body.pdf-active .content-wrapper {
    overflow: hidden !important;
    padding: 0 !important; /* 移除内边距，让阅读器撑满 */
}

/* PDF查看器容器 - 强制撑满主内容区 */
.pdf-viewer {
    display: flex;
    flex-direction: column;
    height: 100vh; /* 适配视口高度 */
    width: 100%;
    background: var(--bg-color);
    position: relative;
    overflow: hidden;
}

/* PDF内容容器 - 独立滚动区域 */
.pdf-container {
    flex: 1;
    overflow-y: auto; /* 核心：让内容在这里滚动 */
    overflow-x: hidden;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 40px 20px;
    background: var(--hover-bg);
    position: relative;
    scroll-behavior: smooth;
}

/* PDF浮动工具栏 - 核心改进：绝对定位在非滚动的 .pdf-viewer 内 */
.pdf-toolbar {
    position: absolute;
    top: 25px;
    left: 50%;
    transform: translateX(-50%) translateY(0);
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
    z-index: 1000;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    max-width: 95%;
    width: auto;
}

/* 暗色主题工具栏 */
[data-theme="dark"] .pdf-toolbar {
    background: rgba(30, 30, 30, 0.85);
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

/* 工具栏折叠状态 - 向上滑出 */
.pdf-toolbar.collapsed {
    opacity: 0;
    pointer-events: none;
    transform: translateX(-50%) translateY(-120%);
}

/* 折叠按钮 - 独立悬浮，位置绝对固定在容器内 */
.pdf-toolbar-toggle {
    position: absolute;
    top: 20px;
    right: 25px;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    color: var(--text-color);
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1001;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.pdf-toolbar-toggle:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* 工具栏内容 */
.pdf-toolbar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px;
    transition: opacity 0.3s ease;
    min-width: 400px;
}

.pdf-toolbar.collapsed .pdf-toolbar-content {
    display: none;
}

/* PDF导航控件 */
.pdf-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.pdf-page-info {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 14px;
    color: var(--text-color);
    white-space: nowrap; /* 核心修复：防止页码信息换行 */
    flex-shrink: 0;
}

.pdf-page-info input {
    width: 45px; /* 微调宽度 */
    padding: 4px 2px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-color);
    color: var(--text-color);
    text-align: center;
    font-size: 13px;
}

/* PDF控制按钮 */
.pdf-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.pdf-view-mode,
.pdf-zoom {
    display: flex;
    align-items: center;
    gap: 6px;
}

.pdf-btn {
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    color: var(--text-secondary);
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
    min-width: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pdf-btn:hover {
    background: var(--hover-bg);
    color: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.pdf-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pdf-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.pdf-zoom-level {
    font-size: 13px;
    color: var(--text-color);
    min-width: 40px;
    text-align: center;
}

/* PDF画布 */
#pdf-canvas {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border-radius: 8px;
    background: white;
    max-width: 100%;
    height: auto;
}

/* 滚动模式容器 */
#pdf-scroll-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    width: 100%;
}

.pdf-page-scroll {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border-radius: 8px;
    background: white;
    overflow: hidden;
}

.pdf-page-scroll canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

/* PDF目录样式增强 */
.toc-item {
    position: relative;
}

/* 移除PDF特有的高亮样式，统一使用 toc.css 的样式 */

.toc-item-header {
    display: flex;
    align-items: center;
    padding: 6px 12px 6px 8px;
    cursor: pointer;
}

.toc-toggle-icon {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    color: var(--text-secondary);
    cursor: pointer;
    flex-shrink: 0;
    transition: transform 0.2s;
    margin-right: 4px;
}

.toc-toggle-icon:hover {
    color: var(--primary-color);
}

.toc-children {
    display: block;
    list-style: none;
    padding: 0;
    margin: 0;
    padding-left: 16px;
    transition: all 0.3s ease;
}

.toc-children[style*="display: none"] {
    display: none !important;
}

/* PDF加载状态 */
.pdf-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 400px;
    color: var(--text-secondary);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* PDF错误状态 */
.pdf-error {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 400px;
    color: var(--text-secondary);
    text-align: center;
    padding: 20px;
}

.pdf-error h1 {
    font-size: 2rem;
    margin-bottom: 16px;
    color: var(--text-color);
}

.pdf-error p {
    margin-bottom: 8px;
    line-height: 1.5;
}

/* 工具栏出现动画 */
.pdf-toolbar {
    animation: slideInDown 0.3s ease-out;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    /* 修复：移动端减去顶部导航栏高度 */
    .pdf-viewer {
        height: calc(100vh - 56px);
    }

    .pdf-toolbar-content {
        flex-direction: column;
        gap: 12px;
        align-items: stretch;
        padding: 8px;
        min-width: 300px;
    }

    .pdf-controls {
        justify-content: space-between;
    }

    .pdf-container {
        padding: 10px;
    }

    .pdf-toolbar {
        top: 10px;
        max-width: 95%;
    }

    .pdf-toolbar-toggle {
        width: 40px;
        height: 40px;
        top: 70px;
        right: 20px;
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .pdf-view-mode,
    .pdf-zoom {
        gap: 4px;
    }

    .pdf-btn {
        padding: 4px 6px;
        font-size: 12px;
        min-width: 28px;
    }

    .pdf-zoom-level {
        font-size: 12px;
        min-width: 35px;
    }

    .pdf-toolbar-content {
        min-width: 280px;
    }

    .pdf-toolbar-toggle {
        width: 36px;
        height: 36px;
        top: 65px;
        right: 15px;
        font-size: 14px;
    }
}

/* 暗色主题适配 */
[data-theme="dark"] .pdf-container {
    background: var(--sidebar-bg);
}

[data-theme="dark"] #pdf-canvas,
[data-theme="dark"] .pdf-page-scroll {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .pdf-toolbar-toggle {
    background: var(--bg-color);
    border-color: var(--border-color);
    color: var(--text-color);
}

/* 高对比度主题适配 */
[data-theme="high-contrast"] .pdf-btn {
    border-width: 2px;
}

[data-theme="high-contrast"] .pdf-btn:hover {
    border-width: 2px;
}

[data-theme="high-contrast"] .pdf-toolbar {
    border-width: 2px;
}

[data-theme="high-contrast"] .pdf-toolbar-toggle {
    border-width: 2px;
}

/* 打印样式 */
@media print {
    .pdf-toolbar {
        display: none;
    }

    .pdf-toolbar-toggle {
        display: none;
    }

    .pdf-container {
        padding: 0;
        background: white;
    }
}

/* 美化滚动条 */
.pdf-container::-webkit-scrollbar {
    width: 8px;
}

.pdf-container::-webkit-scrollbar-track {
    background: var(--bg-color);
}

.pdf-container::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.pdf-container::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* 工具栏悬停效果 */
.pdf-toolbar:not(.collapsed):hover {
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
    transform: translateX(-50%) translateY(-2px);
}

/* 移除强制内边距，让内容占满容器 */
.pdf-container {
    padding-top: 20px;
}

/* 折叠按钮出现动画 */
.pdf-toolbar-toggle {
    animation: fadeInRight 0.3s ease-out;
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(20px) scale(0.8);
    }
    to {
        opacity: 1;
        transform: translateX(0) scale(1);
    }
}

/* 确保折叠按钮在所有主题下都可见 */
.pdf-toolbar-toggle {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* 移除重复的伪元素图标逻辑，图标由 JS 动态设置 innerHTML 控制 */