:root {
    --file-bg-list: var(--bg-darker);
    --file-bg-viewer: var(--bg-dark);
    --file-bg-card: var(--bg-card);
    --file-bg-bar: var(--bg-card);
    
    --file-text-primary: var(--text-primary);
    --file-text-secondary: var(--text-secondary);
    --file-border: var(--border-color);
    --file-accent: var(--primary);
    
    --apple-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --safe-area-top: env(safe-area-inset-top, 20px); 
    --safe-area-bottom: env(safe-area-inset-bottom, 20px);
}

.file-app {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--file-bg-list);
    z-index: 6000;
    font-family: var(--apple-font);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: translateX(0);
    visibility: visible;
    transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), left 0.3s cubic-bezier(0.4, 0, 0.2, 1), width 0.3s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.3s;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}

/* Desktop Sidebar Adjustments */
@media (min-width: 768px) and (max-width: 1023px) {
    /* When sidebar is expanded (default) */
    body.sidebar-expanded .file-app {
        left: var(--sidebar-width, 280px);
        width: calc(100% - var(--sidebar-width, 280px));
    }
    
    /* When sidebar is hidden */
    body.sidebar-hidden .file-app {
        left: 0;
        width: 100%;
    }
}

/* Side Panel Mode for Large Screens */
@media (min-width: 1024px) {
    .file-app {
        left: auto !important;
        right: 0;
        width: var(--tool-panel-width, 450px) !important;
        border-left: 1px solid var(--border-color);
        box-shadow: -2px 0 10px rgba(0,0,0,0.05);
        z-index: 5000;
    }
}

.file-app.hidden {
    transform: translateX(100%);
    opacity: 0;
    pointer-events: none;
    visibility: hidden;
}

/* List View */
.file-list-view {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    background-color: var(--file-bg-list);
}

.file-navbar {
    padding-top: var(--safe-area-top);
    height: 50px;
    box-sizing: content-box; /* Ensure height adds to padding */
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-left: 12px;
    padding-right: 12px;
    background-color: var(--file-bg-bar);
    border-bottom: 0.5px solid var(--file-border);
    z-index: 10;
    position: relative;
    gap: 8px;
}

/* File Viewer Actions & Responsive Fixes */
.file-viewer-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-left: auto;
}

@media (max-width: 768px) {
    .file-navbar {
        padding-left: 8px;
        padding-right: 8px;
        height: 54px;
    }
    
    .file-action-btn {
        padding: 6px;
        font-size: 15px;
    }
    
    .file-viewer-actions {
        gap: 4px;
    }
    
    /* Ensure filename title doesn't crowd out buttons on small screens */
    .file-viewer-view .file-navbar .file-title {
        display: none !important;
    }
    
    /* Ensure the back button text is hidden on very small screens if needed, 
       but "返回" is short so it should be okay. 
       Let's just make sure it's flex-shrink: 0 */
    .file-navbar > button:first-child {
        flex-shrink: 0;
    }
}

.file-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--file-text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    position: absolute;
    left: 50%;
    top: calc(var(--safe-area-top) + 25px);
    transform: translate(-50%, -50%);
    width: auto;
    white-space: nowrap;
}

.file-action-btn {
    background: none;
    border: none;
    color: var(--file-accent);
    font-size: 17px;
    cursor: pointer;
    padding: 8px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.file-path-bar {
    padding: 8px 16px;
    background: var(--file-bg-list);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--file-text-secondary);
    overflow-x: auto;
    white-space: nowrap;
    border-bottom: 1px solid var(--file-border);
}

.file-path-segment {
    cursor: pointer;
    color: var(--file-text-secondary);
}

.file-path-segment:hover {
    color: var(--file-accent);
    text-decoration: underline;
}

.file-path-separator {
    color: var(--file-border);
}

.file-list-content {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0 16px;
}

.file-item-card {
    background-color: var(--file-bg-card);
    border-radius: 10px;
    padding: 12px 16px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: background-color 0.2s;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.file-item-card:active {
    background-color: var(--file-border);
}

.file-info-left {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0;
}

.file-icon {
    font-size: 24px;
    color: var(--file-accent);
    width: 24px;
    text-align: center;
}

.file-name-text {
    font-size: 16px;
    color: var(--file-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-meta-right {
    font-size: 13px;
    color: var(--file-text-secondary);
    margin-left: 12px;
}

/* Viewer View */
.file-viewer-view {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--file-bg-viewer);
    z-index: 100;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1);
}

.file-viewer-view.active {
    transform: translateX(0);
}

.file-viewer-content {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 20px;
    color: var(--file-text-primary);
    font-size: 16px;
    line-height: 1.6;
    /* Ensure content doesn't overflow horizontally */
    max-width: 100%; 
    box-sizing: border-box;
}

.file-viewer-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    border-radius: 8px;
}

/* Code/Text Body */
.code-body pre {
    background: var(--bg-darker);
    padding: 1.25rem;
    border-radius: 8px;
    overflow-x: auto;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    font-size: 14px;
    line-height: 1.5;
    color: var(--file-text-primary) !important; /* Ensure high contrast */
    border: 1px solid var(--file-border);
    /* Wrap text by default to prevent horizontal overflow */
    white-space: pre-wrap; 
    word-break: break-all;
}

.code-body pre code {
    background: transparent;
    padding: 0;
    border-radius: 0;
    color: inherit !important;
}

/* Markdown Styles */
.markdown-body {
    font-family: var(--apple-font);
    font-size: 16px;
    line-height: 1.7;
    color: var(--file-text-primary) !important;
    max-width: 100%; /* Changed from 800px to 100% to fill container */
    width: 100%;     /* Ensure it takes full width */
    margin: 0 auto;
    box-sizing: border-box; /* Include padding in width */
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    margin-top: 24px;
    margin-bottom: 16px;
    font-weight: 600;
    line-height: 1.25;
    color: var(--file-text-primary) !important;
}

.markdown-body h1 { font-size: 2em; border-bottom: 1px solid var(--file-border); padding-bottom: 0.3em; }
.markdown-body h2 { font-size: 1.5em; border-bottom: 1px solid var(--file-border); padding-bottom: 0.3em; }
.markdown-body h3 { font-size: 1.25em; }
.markdown-body h4 { font-size: 1em; }

.markdown-body p {
    margin-top: 0;
    margin-bottom: 16px;
    color: var(--file-text-primary) !important;
}

.markdown-body a {
    color: var(--file-accent);
    text-decoration: none;
}

.markdown-body a:hover {
    text-decoration: underline;
}

.markdown-body ul,
.markdown-body ol {
    margin-top: 0;
    margin-bottom: 16px;
    padding-left: 2em;
    color: var(--file-text-primary) !important;
}

.markdown-body blockquote {
    margin: 0 0 16px;
    padding: 0 1em;
    color: var(--file-text-secondary);
    border-left: 0.25em solid var(--file-border);
}

.markdown-body code {
    padding: 0.2em 0.4em;
    margin: 0;
    font-size: 85%;
    background-color: rgba(127, 127, 127, 0.15);
    border-radius: 6px;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    color: var(--file-text-primary) !important;
}

.markdown-body pre {
    padding: 16px;
    overflow: auto;
    font-size: 85%;
    line-height: 1.45;
    background-color: var(--bg-darker);
    border-radius: 6px;
    margin-bottom: 16px;
    border: 1px solid var(--file-border);
    color: var(--file-text-primary) !important;
}

.markdown-body pre code {
    padding: 0;
    margin: 0;
    background-color: transparent;
    font-size: 100%;
    color: inherit !important;
}

.markdown-body hr {
    height: 0.25em;
    padding: 0;
    margin: 24px 0;
    background-color: var(--file-border);
    border: 0;
}

.markdown-body table {
    border-spacing: 0;
    border-collapse: collapse;
    margin-bottom: 16px;
    width: 100%;
}

.markdown-body table th,
.markdown-body table td {
    padding: 6px 13px;
    border: 1px solid var(--file-border);
}

.markdown-body table th {
    font-weight: 600;
    background-color: var(--bg-card);
}

.markdown-body table tr:nth-child(2n) {
    background-color: rgba(127, 127, 127, 0.05);
}

.markdown-body img {
    max-width: 100%;
    box-sizing: content-box;
    background-color: transparent;
}