/* css/style.css */
:root {
    --bg-app: #f5f5f7;
    --bg-sidebar: rgba(246, 246, 246, 0.7); /* 经典的侧边栏半透明色 */
    --bg-editor: #ffffff;
    --bg-preview: #ffffff;
    
    --text-main: #1d1d1f;
    --text-muted: #86868b;
    
    --border-color: rgba(0, 0, 0, 0.08);
    --accent-color: #007aff;
    --item-hover: rgba(0, 0, 0, 0.04);
    --item-active: rgba(0, 122, 255, 0.1);
    
    --font-apple: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Icons", "PingFang SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --radius-lg: 12px;
    --radius-md: 8px;
}

* { margin: 0; padding: 0; box-sizing: border-box; outline: none; }

body {
    font-family: var(--font-apple);
    background-color: var(--bg-app);
    color: var(--text-main);
    height: 100vh;
    display: flex;
    overflow: hidden;
}

.app-container {
    width: 100%;
    height: 100%;
    display: flex;
    background: var(--bg-editor);
}

/* ====== 左侧：高级感侧边栏 ====== */
.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    backdrop-filter: blur(30px); /* 核心：毛玻璃效果 */
    -webkit-backdrop-filter: blur(30px);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 32px 16px 16px;
}

.search-bar {
    background: rgba(0, 0, 0, 0.06);
    border-radius: var(--radius-md);
    padding: 8px 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
}

.search-bar input {
    border: none;
    background: transparent;
    font-size: 13px;
    width: 100%;
    color: var(--text-main);
}

.file-tree {
    flex: 1;
    overflow-y: auto;
    padding: 0 12px;
}

.tree-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-muted);
    padding: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tree-list { list-style: none; }
.tree-list li {
    padding: 8px 12px;
    font-size: 13px;
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 2px;
    transition: background 0.2s;
}

.tree-list li:hover { background: var(--item-hover); }
.tree-list li.active { background: var(--item-active); color: var(--accent-color); font-weight: 500; }
.tree-list li i { font-size: 16px; opacity: 0.8; }

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
}

.action-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
}
.action-btn:hover { background: var(--item-hover); color: var(--text-main); }

/* ====== 编辑区与预览区 ====== */
.editor-pane, .preview-pane {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.editor-pane { border-right: 1px solid var(--border-color); }

.pane-header {
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    border-bottom: 1px solid var(--border-color);
    font-size: 13px;
    color: var(--text-muted);
}

.file-name { color: var(--text-main); font-weight: 600; }

#markdown-input {
    flex: 1;
    border: none;
    resize: none;
    padding: 40px;
    font-family: "SF Mono", "Menlo", "Consolas", monospace;
    font-size: 15px;
    line-height: 1.7;
    color: #2c2c2e;
    background: transparent;
}

#markdown-output {
    flex: 1;
    padding: 40px;
    overflow-y: auto;
    color: #1d1d1f;
    line-height: 1.8;
}

/* 预览内容样式微调 */
.markdown-body h1 { font-size: 2em; margin-bottom: 0.5em; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; }
.markdown-body p { margin-bottom: 1.2em; }
.markdown-body code { background: rgba(0,0,0,0.05); padding: 2px 4px; border-radius: 4px; }
.markdown-body pre { background: #f8f8f8; padding: 20px; border-radius: 10px; margin-bottom: 20px; overflow: auto; }

/* 滚动条隐藏或精简化 */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.1); border-radius: 10px; }

/* 代码块复制按钮样式 */
.preview-pane pre {
    position: relative; /* 必须设为相对定位，作为按钮的锚点 */
}

.copy-code-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 8px;
    font-size: 12px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(4px);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    opacity: 0; /* 默认透明 */
    transition: all 0.2s ease;
    z-index: 10;
}

/* 代码块容器 */
.preview-pane pre {
    position: relative;
    padding: 20px;
    background: #f8f8f8;
    border-radius: 10px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

/* --- 核心：折叠逻辑 --- */

/* 默认状态（浏览模式）：折叠代码块 */
.preview-pane pre {
    max-height: 4.5em; /* 只显示约 1.5 行的高度 */
    cursor: pointer;
}

/* 默认状态下让代码第一行后面显示省略号效果 */
.preview-pane pre::after {
    content: "...";
    position: absolute;
    bottom: 12px;
    right: 20px;
    padding: 0 8px;
    background: #f8f8f8;
    color: var(--text-muted);
    font-weight: bold;
    opacity: 1;
    transition: opacity 0.2s;
}

/* 书写状态：当输入框聚焦时，或者代码块被手动展开时，取消折叠 */
/* 我们通过在 JS 里给 app-container 加一个 .is-writing 类来控制 */
.app-container.is-writing .preview-pane pre,
.preview-pane pre.is-expanded {
    max-height: 2000px; /* 足够大的高度以容纳代码 */
    cursor: default;
}

/* 书写状态下隐藏省略号 */
.app-container.is-writing .preview-pane pre::after,
.preview-pane pre.is-expanded::after {
    opacity: 0;
}

/* --- 按钮美化 --- */
.code-controls {
    position: absolute;
    top: 8px;
    right: 8px;
    display: flex;
    gap: 4px;
    z-index: 10;
    opacity: 0;
    transition: opacity 0.2s;
}

.preview-pane pre:hover .code-controls {
    opacity: 1;
}

.control-btn {
    padding: 4px 8px;
    font-size: 11px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(4px);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
}

.control-btn:hover {
    color: var(--accent-color);
    background: #fff;
}