/* ==========================================================
   Mobile device-layer styles — [data-device="mobile"]
   ==========================================================
   从 styles.css 拆出的设备层样式，仅当 <html data-device="mobile"> 时生效。
   设备类别由 src/app/router.js 按稳定信号 (UA / 指针精度) 判定；
   窗口宽度自适应仍由 styles.css 的 @media 查询负责。改动移动端
   UI 只应触碰本文件；桌面端共享布局在 styles.css。
   本文件在 styles.css 之后加载，保持与拆分前一致的层叠顺序。
   ========================================================== */

        [data-device="mobile"] .modal {
            width: calc(100vw - 32px);
            max-width: 340px;
            padding: 20px;
        }

        [data-device="mobile"] .modal-actions .btn { flex: 1; }

        /* ========== 设备布局（UA 同步检测驱动） ========== */
        [data-device="mobile"] .mobile-hide { display: none !important; }

        [data-device="mobile"] .desktop-only { display: none !important; }

        [data-device="mobile"] {
            --editor-direction: column;
            --code-white-space: pre-wrap;
            --code-word-break: break-all;
            --toolbar-height: 60px;
            --header-padding-top: 8px;
            --header-min-height: 44px;
            --toolbar-padding-bottom: 6px;
        }

        [data-device="mobile"] .list-panel { width: 40%; min-width: 120px; }

        [data-device="mobile"] .mobile-select {
            -webkit-appearance: none; appearance: none;
            padding: 6px 20px 6px 10px;
            background: var(--bg-surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            color: var(--text-primary);
            font-size: 13px;
            min-height: 32px;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12'%3E%3Cpath fill='%2399a4af' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 6px center;
            padding-right: 24px;
        }

/* ========== 移动端 v9 — 现代原生风 ========== */
        /* --- Base container --- */
        [data-device="mobile"] #mobile-input-actions {
            display: flex;
            flex-direction: column;
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--bg-primary);
        }

        /* --- Header --- */
        [data-device="mobile"] .mob-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--header-padding-top) 14px;
            padding-top: calc(var(--header-padding-top) + env(safe-area-inset-top, 0px));
            min-height: calc(var(--header-min-height) + env(safe-area-inset-top, 0px));
            border-bottom: 1px solid var(--border);
            background: var(--bg-primary);
        }

        [data-device="mobile"] .mob-header-left {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 1;
            min-width: 0;
        }

        [data-device="mobile"] .mob-logo-icon {
            width: 18px;
            height: 18px;
            flex-shrink: 0;
            border-radius: 4px;
            box-shadow: 0 0 0 1px rgba(128, 128, 128, 0.15);
            object-fit: contain;
            display: block;
        }

        [data-device="mobile"] .mob-title {
            font-size: clamp(14px, 3.5vw, 17px);
            font-weight: 600;
            color: var(--text-primary);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        [data-device="mobile"] .mob-header-right {
            display: flex;
            align-items: center;
            gap: 2px;
            flex-shrink: 0;
        }

        [data-device="mobile"] .mob-icon-btn {
            background: none;
            border: none;
            color: var(--text-secondary);
            padding: 6px 10px;
            cursor: pointer;
            font-size: 13px;
            border-radius: 8px;
            -webkit-tap-highlight-color: transparent;
            touch-action: manipulation;
            transition: background 0.15s;
        }

        [data-device="mobile"] .mob-icon-btn:active {
            background: var(--bg-hover, rgba(128,128,128,0.1));
        }

        [data-device="mobile"] .mob-icon-btn:focus-visible {
            outline: 2px solid var(--border-focus);
            outline-offset: -2px;
        }

        [data-device="mobile"] .mob-lang-text {
            font-weight: 600;
            font-size: 13px;
        }

        /* --- Toolbar --- */
        [data-device="mobile"] .mob-toolbar {
            position: fixed;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: 50;
            width: 100%;
            max-width: 100vw;
            overflow-x: auto;
            overflow-y: hidden;
            overscroll-behavior-x: contain;
            padding: 6px 6px;
            padding-left: calc(6px + env(safe-area-inset-left, 0px));
            padding-right: calc(6px + env(safe-area-inset-right, 0px));
            padding-bottom: calc(6px + env(safe-area-inset-bottom, 0px));
            background: var(--bg-primary);
            border-top: 1px solid var(--border);
            box-sizing: border-box;
            /* 长语言(如德语)按钮放不下时横向滑动, 滑动条隐藏保持外观干净 */
            scrollbar-width: none;
        }

        [data-device="mobile"] .mob-toolbar::-webkit-scrollbar { display: none; }

        [data-device="mobile"] .mob-toolbar-scroll {
            display: flex;
            gap: 3px;
            width: 100%;
        }

        [data-device="mobile"] .mob-btn {
            flex: 1;
            /* 不设 min-width:0: 按钮保持文字自然宽度, 放不下时走 .mob-toolbar 横向滑动,
               避免长语言(德语)下文字被压出按钮边界互相重叠 */
            justify-content: center;
            display: flex;
            align-items: center;
            gap: 3px;
            padding: 6px 6px;
            box-sizing: border-box;
            background: var(--bg-surface, var(--bg-secondary));
            border: 1px solid var(--border);
            border-radius: 10px;
            color: var(--text-primary);
            font-size: clamp(12px, 3vw, 14px);
            font-weight: 500;
            cursor: pointer;
            white-space: nowrap;
            -webkit-tap-highlight-color: transparent;
            transition: background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
            touch-action: manipulation;
            min-height: 40px;
            transform-origin: center;
        }

        [data-device="mobile"] .mob-btn:active {
            transform: scale(0.95);
            background: var(--bg-hover, rgba(128,128,128,0.1));
        }

        [data-device="mobile"] .mob-btn:focus-visible {
            outline: 2px solid var(--border-focus);
            outline-offset: -2px;
        }

        [data-device="mobile"] .mob-btn svg {
            flex-shrink: 0;
        }

        [data-device="mobile"] .mob-btn-primary {
            flex: 1;
            justify-content: center;
            background: var(--accent-color, #3b82f6);
            color: #fff;
            border-color: var(--accent-color, #3b82f6);
            font-weight: 600;
            padding: 6px;
            box-shadow: 0 2px 8px rgba(59, 130, 246, 0.25);
            transform-origin: center;
        }

        [data-device="mobile"] .mob-btn-primary:active {
            background: var(--accent-hover, #2563eb);
            box-shadow: 0 1px 4px rgba(59, 130, 246, 0.15);
        }

        [data-device="mobile"] .mob-btn span {
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        [data-device="mobile"] .mob-more-btn {
            background: var(--bg-surface, var(--bg-secondary));
        }

        /* --- Bottom Sheet --- */
        [data-device="mobile"] .mob-sheet-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.4);
            z-index: 200;
        }

        [data-device="mobile"] .mob-sheet-overlay.open { display: block; -webkit-backdrop-filter: blur(2px); backdrop-filter: blur(2px); }

        [data-device="mobile"] .mob-sheet {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 201;
            background: var(--bg-primary);
            border-radius: 16px 16px 0 0;
            padding: 8px 16px calc(16px + env(safe-area-inset-bottom, 0px));
            box-shadow: 0 -4px 24px rgba(0,0,0,0.12);
            transform: translateY(100%);
            transition: transform 0.4s cubic-bezier(0.32, 1.2, 0, 1);
            overscroll-behavior: contain;
            max-height: 85vh;
            overflow-y: auto;
            touch-action: pan-y;
            will-change: transform;
        }

        [data-device="mobile"] .mob-sheet.open {
            display: block;
            transform: translateY(0);
        }

        [data-device="mobile"] .mob-sheet-handle {
            width: 36px;
            height: 4px;
            border-radius: 2px;
            background: var(--border);
            margin: 0 auto 12px;
        }

        [data-device="mobile"] .mob-sheet-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
            text-align: center;
        }

        [data-device="mobile"] .mob-sheet-items {
            display: flex;
            flex-direction: column;
            gap: 2px;
            margin-bottom: 8px;
        }

        [data-device="mobile"] .mob-sheet-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 14px;
            background: none;
            border: none;
            border-radius: 10px;
            color: var(--text-primary);
            font-size: 15px;
            cursor: pointer;
            -webkit-tap-highlight-color: transparent;
            touch-action: manipulation;
            transition: background 0.15s;
            width: 100%;
            text-align: left;
        }

        [data-device="mobile"] .mob-sheet-item:active {
            background: var(--bg-hover, rgba(128,128,128,0.08));
        }

        [data-device="mobile"] .mob-sheet-item:focus-visible {
            outline: 2px solid var(--border-focus);
            outline-offset: -2px;
        }

        [data-device="mobile"] .mob-sheet-item svg {
            color: var(--text-secondary);
            flex-shrink: 0;
        }

        [data-device="mobile"] .mob-sheet-close {
            width: 100%;
            padding: 12px;
            background: var(--bg-surface, var(--bg-secondary));
            border: none;
            border-radius: 10px;
            color: var(--text-primary);
            font-size: 15px;
            font-weight: 500;
            cursor: pointer;
            -webkit-tap-highlight-color: transparent;
            touch-action: manipulation;
        }

        [data-device="mobile"] .mob-sheet-close:active {
            background: var(--bg-hover, rgba(128,128,128,0.1));
        }

        [data-device="mobile"] .mob-sheet-close:focus-visible {
            outline: 2px solid var(--border-focus);
            outline-offset: -2px;
        }

        /* --- Editor Area (mobile auto-adapt) --- */
        [data-device="mobile"] .editor-area {
            flex-direction: var(--editor-direction);
        }

        [data-device="mobile"] .panel-left {
            border-right: none;
            border-bottom: 1px solid var(--border);
        }

        [data-device="mobile"] .panel-header {
            padding: 6px 12px;
            font-size: 11px;
        }

        [data-device="mobile"] .panel-icon-btn {
            width: 30px;
            height: 30px;
        }

        [data-device="mobile"] .output-search-bar {
            padding: 8px 10px;
        }

        [data-device="mobile"] .output-search-bar input {
            height: 34px;
            font-size: 15px;
        }

        [data-device="mobile"] .search-nav-btn,
        [data-device="mobile"] .search-close-btn {
            width: 32px;
            height: 32px;
        }

        [data-device="mobile"] .panel-body {
            padding: 8px 10px;
            font-size: clamp(12px, 2.8vw, 14px);
        }

        [data-device="mobile"] #input {
            padding: 10px 12px;
            font-size: clamp(13px, 3vw, 15px);
            min-height: 80px;
        }

        /* --- Sidebar (mobile) --- */
        [data-device="mobile"] .sidebar {
            width: 100%;
            border-left: none;
        }

        [data-device="mobile"] .sidebar.collapsed { max-height: 0; padding: 0; overflow: hidden; }

        [data-device="mobile"] .main-layout { flex-direction: column; }

        /* --- Overflow protection (v10) --- */
        html[data-device="mobile"],
        [data-device="mobile"] body {
            overflow-x: hidden;
            width: 100%;
            box-sizing: border-box;
        }

        [data-device="mobile"] #mobile-input-actions {
            padding-left: env(safe-area-inset-left, 0px);
            padding-right: env(safe-area-inset-right, 0px);
        }

        [data-device="mobile"] .main-layout {
            width: 100%;
            box-sizing: border-box;
            padding-left: env(safe-area-inset-left, 0px);
            padding-right: env(safe-area-inset-right, 0px);
            /*
              v13 底部 toolbar 覆盖式（与横屏一致）：
              - 不再为 fixed mob-toolbar 预留 padding-bottom，
                输出面板延伸到屏幕底，toolbar 覆盖在内容上方。
              - 滚动容器（#input / .output-content 等）内部加
                padding-bottom，保证最后一行能滚出 toolbar 遮挡区。
            */
            padding-bottom: 0;
        }

        [data-device="mobile"] .editor-area {
            width: 100%;
            max-width: 100vw;
            /* height:100% 会让 flex:1 的"收缩"失效, 导致 main-layout 被 editor 撑破
               → 底部出现白色 dead space. 改用 flex 高度自适应. */
            flex: 1 1 auto;
            min-height: 0;
            overflow: hidden;
            -webkit-overflow-scrolling: auto;
        }

        [data-device="mobile"] .panel {
            min-width: 0;
            max-width: 100%;
            overflow: hidden;
        }

        [data-device="mobile"] .panel-body {
            word-break: break-all;
            overflow-wrap: break-word;
            max-width: 100%;
            -webkit-overflow-scrolling: touch;
        }

        [data-device="mobile"] .panel-body pre {
            white-space: pre-wrap;
            word-break: break-all;
            max-width: 100%;
        }

        [data-device="mobile"] #input {
            max-width: 100%;
            white-space: pre-wrap;
            word-break: break-all;
            -webkit-overflow-scrolling: touch;
        }

        [data-device="mobile"] .output-content pre {
            white-space: pre-wrap !important;
            word-break: break-all !important;
            max-width: 100%;
        }

        /* v13: toolbar 改覆盖式后，滚动容器内部给最后一行留出滚动余量
           （toolbar 高度约 52px + safe-area，取 60px 留呼吸空间） */
        [data-device="mobile"] #input,
        [data-device="mobile"] .output-content,
        [data-device="mobile"] .error-display {
            padding-bottom: calc(60px + env(safe-area-inset-bottom, 0px));
        }

        /* v13: 桌面 statusbar 在 mobile 上被 fixed toolbar 整体遮挡（z-1 < z-50），
           却仍占据 24px 布局位 → 隐藏，让面板延伸到屏幕底 */
        [data-device="mobile"] .statusbar { display: none; }

        [data-device="mobile"] .output-content code {
            white-space: pre-wrap !important;
            word-break: break-all !important;
        }

        [data-device="mobile"] .output-content {
            -webkit-overflow-scrolling: touch;
        }

        [data-device="mobile"] .output-content-area,
        [data-device="mobile"] .output-wrap {
            -webkit-overflow-scrolling: touch;
        }

        /* --- Compact header title (v10) --- */
        [data-device="mobile"] .mob-title {
            max-width: calc(100vw - 140px);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        /* --- Smaller buttons on small screens --- */
        @media (max-width: 400px) {
            [data-device="mobile"] .mob-btn {
                padding: 6px 4px;
                font-size: clamp(11px, 2.6vw, 13px);
                gap: 2px;
            }
            [data-device="mobile"] .mob-btn-primary {
                padding: 6px 4px;
                gap: 2px;
            }}

        /* --- Sidebar hidden by default on mobile --- */
        [data-device="mobile"] .sidebar:not(.active) {
            display: none;
        }

        /* ========== 移动端 UX 重构（v11）==========
           1. main-layout 底部留白，避免被 fixed mob-toolbar 遮挡
           2. 输入/输出 Tab 切换（全屏切换，不再上下挤压）
           3. 历史侧栏改为全屏抽屉（从右侧滑入） */

        /* 底部留白已在 v10 块统一处理（见上）*/

        /* 2. Tab 切换：滑动过渡效果 */
        [data-device="mobile"] .editor-area {
            position: relative;
            overflow: hidden;
        }

        [data-device="mobile"] .editor-area .panel-left,
        [data-device="mobile"] .editor-area .panel-right {
            position: absolute;
            inset: 0;
            display: flex;
            transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1), opacity 0.2s ease;
            will-change: transform, opacity;
        }

        [data-device="mobile"] .editor-area .panel-left {
            transform: translateX(0);
            opacity: 1;
            border-bottom: none;
        }

        [data-device="mobile"] .editor-area .panel-right {
            transform: translateX(100%);
            opacity: 0;
        }

        [data-device="mobile"] .editor-area .panel-left:not(.is-active) {
            transform: translateX(-30%);
            opacity: 0;
        }

        [data-device="mobile"] .editor-area .panel-right.is-active {
            transform: translateX(0);
            opacity: 1;
        }

        /* 移动端 Tab 栏（输入/输出切换） */
        [data-device="mobile"] .mob-tabs {
            display: flex;
            background: var(--bg-secondary);
            border-bottom: 1px solid var(--border);
            flex-shrink: 0;
        }

        [data-device="mobile"] .mob-tab {
            flex: 1;
            padding: 10px 12px;
            background: none;
            border: none;
            color: var(--text-secondary);
            font-size: 13px;
            font-weight: 500;
            cursor: pointer;
            text-align: center;
            border-bottom: 2px solid transparent;
            -webkit-tap-highlight-color: transparent;
            touch-action: manipulation;
            transition: color 0.15s, border-color 0.15s;
        }

        [data-device="mobile"] .mob-tab.is-active {
            color: var(--accent);
            border-bottom-color: var(--accent);
            font-weight: 600;
        }

        [data-device="mobile"] .mob-tab:focus-visible {
            outline: 2px solid var(--border-focus);
            outline-offset: -2px;
        }

        /* 3. 历史侧栏全屏抽屉 */
        [data-device="mobile"] .sidebar {
            position: fixed;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            width: 100%;
            max-width: 100vw;
            max-height: 100dvh;
            height: 100dvh;
            z-index: 300;
            background: var(--bg-primary);
            border-left: 1px solid var(--border);
            transform: translateX(100%);
            transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1);
            display: flex;
            flex-direction: column;
            padding-left: env(safe-area-inset-left, 0px);
            padding-right: env(safe-area-inset-right, 0px);
            padding-top: env(safe-area-inset-top, 0px);
            /* 底部 safe-area 由 .sidebar-footer 自己处理, 这里不加避免双重留白 */
            overscroll-behavior: contain;
            touch-action: pan-y;
        }

        [data-device="mobile"] .sidebar.active {
            transform: translateX(0);
            display: flex;
        }

        [data-device="mobile"] .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.4);
            z-index: 250;
        }

        [data-device="mobile"] .sidebar-overlay.active {
            display: block;
            -webkit-backdrop-filter: blur(2px);
            backdrop-filter: blur(2px);
        }

        [data-device="mobile"] .sidebar-header {
            padding: 12px 14px;
            border-bottom: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-shrink: 0;
            /* Add safe-area top padding for notch devices */
            padding-top: calc(12px + env(safe-area-inset-top, 0px));
            min-height: calc(48px + env(safe-area-inset-top, 0px));
        }

        /* Larger touch target for sidebar close button on mobile */
        [data-device="mobile"] .sidebar-toggle {
            width: 40px;
            height: 40px;
            font-size: 16px;
        }

        [data-device="mobile"] .history-list {
            flex: 1;
            overflow-y: auto;
        }

        [data-device="mobile"] .sidebar-footer {
            flex-shrink: 0;
            padding: 10px 14px calc(10px + env(safe-area-inset-bottom, 0px));
            border-top: 1px solid var(--border);
        }

        /* 移动端隐藏桌面端的 sidebar-toggle 浮动按钮（用抽屉替代） */
        [data-device="mobile"] #sidebar-open-btn {
            display: none !important;
        }

        /* ========== 横屏专属适配（v12）==========
           横屏核心策略：双面板并排 + 隐藏 Tab 栏 + 缩减 header/toolbar
           覆盖 v11 的 display:none 和竖屏 max-height 限制
           阈值 500px：区分手机横屏（矮视口）与平板横屏（高视口） */

        @media (orientation: landscape) and (max-height: 500px) {
            /* 0. 锁定页面滚动，内容填满视口 */
            [data-device="mobile"] html {
                height: 100%;
                overflow: hidden !important;
            }
            [data-device="mobile"] body {
                height: 100dvh;
                overflow: hidden !important;
                display: flex;
                flex-direction: column;
            }
            [data-device="mobile"] .main-layout {
                flex: 1;
                overflow: hidden !important;
                min-height: 0;
                padding-bottom: 0 !important;
            }

            [data-device="mobile"] {
                --editor-direction: row;
                --code-white-space: pre;
                --code-word-break: normal;
                --toolbar-height: 44px;
                --header-padding-top: 4px;
                --header-min-height: 36px;
                --toolbar-padding-bottom: 4px;
            }
            /* 1. editor-area 改为左右布局 */
            [data-device="mobile"] .editor-area {
                position: static;
                flex-direction: row;
                overflow: hidden;
                touch-action: pan-y;
            }

            /* 2. 覆盖竖屏的 absolute 定位 — 横屏下两个面板都显示 */
            [data-device="mobile"] .editor-area .panel-left,
            [data-device="mobile"] .editor-area .panel-right {
                position: static;
                display: flex !important;
                flex: 1 1 50%;
                min-width: 160px;
                max-width: 50%;
                max-height: none;
                min-height: 0;
                transform: none !important;
                opacity: 1 !important;
                transition: none !important;
                touch-action: auto;
            }
            [data-device="mobile"] .editor-area .panel-left {
                border-right: 1px solid var(--border) !important;
                border-bottom: none !important;
            }

            /* 3. 只允许 textarea 和输出区域内部滚动 */
            [data-device="mobile"] .editor-area #input,
            [data-device="mobile"] .editor-area .output-content-area,
            [data-device="mobile"] .editor-area .output-wrap {
                touch-action: pan-y;
                -webkit-overflow-scrolling: touch;
            }

            /* 3. 隐藏 Tab 栏（横屏双面板不需要切换） */
            [data-device="mobile"] .mob-tabs {
                display: none;
            }

            /* 4. 缩减 header 高度，腾出内容空间 */
            [data-device="mobile"] .mob-header {
                padding: 4px 14px;
                padding-top: calc(4px + env(safe-area-inset-top, 0px));
                min-height: calc(36px + env(safe-area-inset-top, 0px));
            }
            [data-device="mobile"] .mob-title {
                font-size: 13px;
            }
            [data-device="mobile"] .mob-icon-btn {
                padding: 4px 8px;
            }

            /* 5. 底部 toolbar：图标+小字横向均分，保证最小 44px 触摸目标 */
            [data-device="mobile"] .mob-toolbar {
                padding: var(--toolbar-padding-bottom) 6px;
                padding-left: calc(6px + env(safe-area-inset-left, 0px));
                padding-right: calc(6px + env(safe-area-inset-right, 0px));
                padding-bottom: calc(var(--toolbar-padding-bottom) + env(safe-area-inset-bottom, 0px));
            }
            [data-device="mobile"] .mob-toolbar-scroll {
                gap: 6px;
            }
            [data-device="mobile"] .mob-btn {
                min-height: 44px;
                padding: 4px 6px;
                font-size: 11px;
                flex-direction: column;
                gap: 2px;
                border-radius: 8px;
            }
            [data-device="mobile"] .mob-btn svg {
                width: 18px;
                height: 18px;
            }
            [data-device="mobile"] .mob-btn span {
                font-size: 10px;
            }

            /* 6. panel-header 更紧凑 */
            [data-device="mobile"] .panel-header {
                padding: 4px 10px;
                height: 28px;
                font-size: 10px;
            }

            /* 7. 横屏不需要强制换行（左右分栏宽度足够水平滚动） */
            [data-device="mobile"] .json-tree {
                white-space: var(--code-white-space);
                word-break: var(--code-word-break);
            }
            [data-device="mobile"] .output-content pre,
            [data-device="mobile"] .output-content code {
                white-space: var(--code-white-space) !important;
                word-break: var(--code-word-break) !important;
            }
            [data-device="mobile"] #input {
                white-space: var(--code-white-space);
                word-break: var(--code-word-break);
            }

            /* 8. 横屏两侧空白修复：
                  - .main-layout / bg-image-layer / watermark 都要尊重 safe-area-inset-{left,right} 的反向补偿：
                    横屏下 WebView 会把两侧刘海空出来, 但我们希望背景图和水印都一直平铺到屏幕边缘.
                  - 所以对 .bg-image-layer / .watermark-layer 使用负 margin + 对应更大的
                    padding/width 来让视觉覆盖到安全区外. 另一种更稳妥的写法是让这些层
                    直接 viewport-fill=cover, 但 iOS WKWebView 不稳定, 所以使用 CSS 补偿： */
            [data-device="mobile"] .main-layout {
                padding-left: 0 !important;
                padding-right: 0 !important;
            }
            [data-device="mobile"] .bg-image-layer,
            [data-device="mobile"] .watermark-layer {
                left: calc(-1 * env(safe-area-inset-left, 0px));
                right: calc(-1 * env(safe-area-inset-right, 0px));
                top: calc(-1 * env(safe-area-inset-top, 0px));
                bottom: calc(-1 * env(safe-area-inset-bottom, 0px));
                width: auto;
                background-size: cover;
                background-origin: border-box;
                background-repeat: no-repeat;
            }
            [data-device="mobile"] .watermark-layer {
                background-repeat: repeat;
                background-size: auto;
            }}

        [data-device="mobile"] .settings-modal {
            width: calc(100vw - 32px);
            max-width: 360px;
        }

        /* --- iPhone Duo 内屏等大画布触屏（≥600px）：双栏并排 ---
           断点依据：Duo 外屏 466pt（保持 tab 单栏）、内屏 626pt（双栏），
           现有 iPhone 最大 440pt 不受影响；iPad 等更大触屏一并受益。
           规则形态与横屏矮屏块一致，但保留标准高度的工具栏/头部，
           不套用横屏紧凑变量（--toolbar-height 等）。 */
        @media (min-width: 600px) {
            [data-device="mobile"] {
                --editor-direction: row;
            }

            [data-device="mobile"] .main-layout {
                overflow: hidden;
                min-height: 0;
            }

            [data-device="mobile"] .editor-area {
                position: static;
                flex-direction: row;
                overflow: hidden;
                touch-action: pan-y;
            }

            /* 覆盖竖屏 tab 模式的 absolute/transform 面板切换——两栏并排都显示 */
            [data-device="mobile"] .editor-area .panel-left,
            [data-device="mobile"] .editor-area .panel-right {
                position: static;
                display: flex !important;
                flex: 1 1 50%;
                min-width: 220px;
                max-width: 50%;
                max-height: none;
                min-height: 0;
                transform: none !important;
                opacity: 1 !important;
                transition: none !important;
                touch-action: auto;
            }

            [data-device="mobile"] .editor-area .panel-left {
                border-right: 1px solid var(--border) !important;
                border-bottom: none !important;
            }

            /* 只允许 textarea 与输出区内部滚动 */
            [data-device="mobile"] .editor-area #input,
            [data-device="mobile"] .editor-area .output-content-area,
            [data-device="mobile"] .editor-area .output-wrap {
                touch-action: pan-y;
                -webkit-overflow-scrolling: touch;
            }

            /* 双栏无需 tab 切换 */
            [data-device="mobile"] .mob-tabs {
                display: none;
            }
        }