/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 1024px) {
    html {
        font-size: 16px;
    }
    
    .header-content {
        padding: 0 var(--space-md);
    }
    
    .reading-area {
        padding: var(--space-xl) var(--space-md);
    }
    
    .status-content {
        padding: 0 var(--space-md);
    }
    
    :root {
        --sidebar-width: 280px;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 16px;
    }
    
    :root {
        --header-height: 56px;
        --status-bar-height: 40px;
        --sidebar-width: 100%;
    }
    
    /* 移动端标题栏宽度适配 */
    .header {
        width: 100%;
        box-sizing: border-box;
    }
    
    .header-content {
        width: 100%;
        max-width: 100%;
        margin: 0;
        padding: 0 var(--space-sm);
        box-sizing: border-box;
    }
    
    .logo-text {
        display: none;
    }
    
    /* 移动端标题栏布局修复：防止长文件名挤出右侧图标 */
    .header-left {
        flex: 1;
        min-width: 0;
        overflow: hidden;
    }
    
    .file-info {
        overflow: hidden;
        min-width: 0;
    }
    
    .header-right {
        flex-shrink: 0;
    }
    
    /* 移动端文件名宽度限制，避免挤出右侧图标 */
    .file-name {
        max-width: 120px;
    }
    
    /* 移动端底部状态栏宽度适配 */
    .status-bar {
        width: 100%;
        box-sizing: border-box;
    }
    
    .status-content {
        width: 100%;
        max-width: 100%;
        margin: 0;
        padding: 0 var(--space-sm);
        box-sizing: border-box;
        gap: var(--space-lg);
    }
    
    .status-item {
        font-size: 0.75rem;
    }
    
    /* 移动端阅读区域优化 - 与 header/status-bar 视觉宽度一致 */
    .reading-area {
        width: 100%;
        max-width: 100%;
        padding: var(--space-lg) 0;
    }
    
    .markdown-content {
        padding: var(--space-md);
        border-radius: 0;
        margin: 0;
    }
    
    .welcome-content {
        padding: var(--space-xl);
    }
    
    .welcome-icon svg {
        width: 80px;
        height: 80px;
    }
    
    .markdown-content h1 {
        font-size: 1.75rem;
    }
    
    .markdown-content h2 {
        font-size: 1.375rem;
    }
    
    .markdown-content h3 {
        font-size: 1.125rem;
    }
    
    .markdown-content .table-wrapper {
        margin: 1.25em 0;
    }
    
    .markdown-content table {
        font-size: 0.9rem;
    }
    
    .settings-sidebar {
        height: calc(100vh - var(--header-height));
        top: var(--header-height);
    }
    
    /* 移动端目录导航 - 显示在header下方的内容区域顶部 */
    .floating-toc {
        position: fixed;
        left: 0;
        right: 0;
        top: var(--header-height);
        transform: none;
        max-height: 50vh;
        max-width: 100%;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        box-shadow: 0 4px 20px var(--color-shadow);
        z-index: 95;
        overflow-y: auto;
    }
    
    .floating-toc-nav {
        max-height: calc(50vh - 16px);
        padding: var(--space-sm) var(--space-md);
    }
    
    .floating-toc-nav .toc-list {
        display: block;
    }
    
    .floating-toc-nav .toc-item {
        margin-bottom: var(--space-xs);
    }
    
    .floating-toc-nav .toc-link {
        max-width: none;
        font-size: 0.875rem;
        padding: var(--space-xs) var(--space-sm);
    }
    
    /* 保持层级缩进 */
    .floating-toc-nav .toc-item[data-level="1"] .toc-link {
        padding-left: var(--space-sm);
        font-weight: 500;
    }
    
    .floating-toc-nav .toc-item[data-level="2"] .toc-link {
        padding-left: calc(var(--space-sm) + 16px);
        font-size: 0.8125rem;
    }
    
    .floating-toc-nav .toc-item[data-level="3"] .toc-link {
        padding-left: calc(var(--space-sm) + 32px);
        font-size: 0.75rem;
    }
    
    .floating-toc-nav .toc-link.active {
        background: linear-gradient(90deg, var(--color-accent), #F39C12);
        -webkit-background-clip: unset;
        background-clip: unset;
        -webkit-text-fill-color: unset;
        color: white;
    }

    /* 移动端编辑工具栏适配 */
    .edit-toolbar {
        padding: var(--space-xs) var(--space-sm);
        gap: 2px;
        justify-content: flex-start;
    }

    .edit-toolbar::before {
        display: none;
    }

    .toolbar-group {
        gap: 2px;
        flex-wrap: nowrap;
    }

    .toolbar-group:first-child {
        margin-left: 0;
    }

    .toolbar-divider {
        display: none;
    }

    .toolbar-btn {
        width: 32px;
        min-width: 32px;
        height: 32px;
        padding: 0;
        flex-shrink: 0;
    }

    .toolbar-btn svg {
        width: 14px;
        height: 14px;
    }

    /* 移动端编辑容器增加顶部padding，避免被工具栏遮挡 */
    .editor-container.visible {
        padding-top: 0;
    }

    .editor-content {
        padding-top: 80px;
    }

    /* 移动端编辑模式下，markdownContent 需要留出工具栏空间 */
    .markdown-content.editing {
        padding-top: 80px !important;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 15px;
    }
    
    /* 小屏幕文件名更短 */
    .file-name {
        max-width: 80px;
    }
    
    .header-left {
        flex: 1;
        min-width: 0;
        overflow: hidden;
        gap: var(--space-sm);
    }
    
    .header-right {
        flex-shrink: 0;
    }
    
    /* 小屏幕状态栏优化：三个元素始终显示，居中靠拢 */
    .status-content {
        gap: var(--space-md);
        justify-content: center;
    }
    
    .status-item {
        font-size: 0.7rem;
        gap: 2px;
    }
    
    .status-icon {
        width: 12px;
        height: 12px;
    }
    
    .welcome-title {
        font-size: 1.25rem;
    }
    
    /* 小屏幕阅读区域 - 保持与 header/status-bar 宽度一致 */
    .reading-area {
        padding: var(--space-md) 0;
    }
    
    .markdown-content {
        padding: var(--space-sm);
        border-radius: 0;
    }
    
    .markdown-content pre {
        padding: var(--space-sm);
        font-size: 0.8rem;
    }
    
    .markdown-content .table-wrapper {
        margin: 1em 0;
        border-radius: var(--radius-sm);
    }
    
    .markdown-content table {
        font-size: 0.85rem;
    }
    
    .markdown-content th,
    .markdown-content td {
        padding: var(--space-xs) var(--space-sm);
        white-space: nowrap;
    }
    
    .bg-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    /* 移动端设置行改为单列布局 */
    .setting-row {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .setting-item .setting-select {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.75rem;
    }
    
    .setting-control-compact .size-btn {
        width: 24px;
        height: 24px;
    }
    
    .setting-control-compact .setting-value {
        font-size: 0.75rem;
        min-width: 36px;
    }
    
    .theme-btn {
        padding: var(--space-xs) var(--space-md);
        font-size: 0.8rem;
    }
}

/* ========================================
   Accessibility
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles */
::focus-visible {
    outline: 2px solid var(--color-link);
    outline-offset: 2px;
}

/* Hide file input - positioned off-screen but clickable via JS */
#fileInput {
    position: fixed;
    left: -9999px;
    top: -9999px;
    opacity: 0;
    width: 0;
    height: 0;
    background-color: transparent !important;
    border: none !important;
}

/* Ensure file input has no visual impact in any theme */
[data-theme="dark"] #fileInput,
[data-theme="light"] #fileInput {
    background-color: transparent !important;
    color: transparent !important;
}

/* Disable background settings in dark mode - visual indication */
[data-theme="dark"] .bg-tab,
[data-theme="dark"] .bg-option {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

[data-theme="dark"] input[type="range"]:disabled,
[data-theme="dark"] .setting-control:has(#bgOpacitySlider) {
    opacity: 0.5;
    pointer-events: none;
}