/* ===== CSS Variables ===== */
:root {
    --bg-primary: #f3f3f3;
    --bg-secondary: #ffffff;
    --bg-taskbar: rgba(243,243,243,0.85);
    --bg-menu: rgba(252,252,252,0.92);
    --bg-hover: rgba(0,0,0,0.04);
    --bg-active: rgba(0,0,0,0.08);
    --bg-window: #ffffff;
    --bg-titlebar: #f0f0f0;
    --text-primary: #1a1a1a;
    --text-secondary: #666;
    --text-muted: #999;
    --border-color: rgba(0,0,0,0.08);
    --accent: #0078d4;
    --accent-hover: #106ebe;
    --danger: #e81123;
    --success: #107c10;
    --shadow-window: 0 8px 32px rgba(0,0,0,0.14), 0 2px 8px rgba(0,0,0,0.08);
    --shadow-menu: 0 8px 24px rgba(0,0,0,0.14);
    --radius: 8px;
    --radius-sm: 4px;
    --taskbar-height: 48px;
    --icon-size: 48px;
    --transition: 0.15s ease;
}

[data-theme="dark"] {
    --bg-primary: #202020;
    --bg-secondary: #2d2d2d;
    --bg-taskbar: rgba(32,32,32,0.88);
    --bg-menu: rgba(44,44,44,0.95);
    --bg-hover: rgba(255,255,255,0.06);
    --bg-active: rgba(255,255,255,0.1);
    --bg-window: #2d2d2d;
    --bg-titlebar: #333;
    --text-primary: #f0f0f0;
    --text-secondary: #aaa;
    --text-muted: #777;
    --border-color: rgba(255,255,255,0.08);
    --shadow-window: 0 8px 32px rgba(0,0,0,0.3);
    --shadow-menu: 0 8px 24px rgba(0,0,0,0.3);
}

/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow: hidden; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif; font-size: 14px; color: var(--text-primary); }
.hidden { display: none !important; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
input, select { font: inherit; }

/* ===== Login Page ===== */
.login-page { display: flex; align-items: center; justify-content: center; height: 100vh; }
.login-wallpaper { position: fixed; inset: 0; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); z-index: 0; }
.login-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.1); z-index: 1; }
.login-container { position: relative; z-index: 2; display: flex; flex-direction: column; align-items: center; padding: 48px 40px; background: var(--bg-menu); backdrop-filter: blur(40px) saturate(180%); border-radius: 16px; box-shadow: var(--shadow-window); min-width: 360px; }
.login-avatar { margin-bottom: 16px; }
.login-avatar svg { border-radius: 50%; }
.login-title { font-size: 22px; font-weight: 600; margin-bottom: 24px; color: var(--text-primary); }
.login-form { width: 100%; display: flex; flex-direction: column; gap: 12px; }
.login-field input { width: 100%; padding: 10px 14px; border: 2px solid var(--border-color); border-radius: var(--radius-sm); background: var(--bg-secondary); color: var(--text-primary); font-size: 14px; outline: none; transition: border-color var(--transition); }
.login-field input:focus { border-color: var(--accent); }
.login-error { color: var(--danger); font-size: 13px; min-height: 20px; text-align: center; }
.login-btn { padding: 10px; background: var(--accent); color: #fff; border-radius: var(--radius-sm); font-size: 15px; font-weight: 500; transition: background var(--transition); }
.login-btn:hover { background: var(--accent-hover); }
.login-btn:disabled { opacity: 0.6; cursor: not-allowed; }

/* ===== Desktop ===== */
.desktop-page { display: flex; flex-direction: column; height: 100vh; }
#desktop { flex: 1; position: relative; overflow: hidden; background-size: cover; background-position: center; background-color: #1a73e8; background-image: url('https://images.unsplash.com/photo-1506905925346-21bda4d32df4?w=1920&q=80'); }
.desktop-icons { position: absolute; inset: 16px; bottom: 16px; display: flex; flex-direction: column; flex-wrap: wrap; align-content: flex-start; gap: 8px; }
.desktop-icon { display: flex; flex-direction: column; align-items: center; width: 80px; padding: 8px 4px; border-radius: var(--radius-sm); cursor: pointer; transition: background var(--transition); user-select: none; }
.desktop-icon:hover { background: rgba(255,255,255,0.15); }
.desktop-icon.selected { background: rgba(255,255,255,0.25); outline: 1px solid rgba(255,255,255,0.4); }
.desktop-icon-img { width: var(--icon-size); height: var(--icon-size); display: flex; align-items: center; justify-content: center; font-size: 36px; margin-bottom: 4px; }
.desktop-icon-name { font-size: 12px; color: #fff; text-align: center; word-break: break-all; text-shadow: 0 1px 3px rgba(0,0,0,0.6); line-height: 1.3; max-width: 76px; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }

/* ===== Taskbar ===== */
.taskbar { height: var(--taskbar-height); display: flex; align-items: center; background: var(--bg-taskbar); backdrop-filter: blur(30px) saturate(180%); border-top: 1px solid var(--border-color); padding: 0 4px; z-index: 1000; }
.start-btn { display: flex; align-items: center; justify-content: center; height: 40px; padding: 0 16px; border-radius: var(--radius-sm); background: linear-gradient(135deg, #0078d4, #005a9e); transition: all var(--transition); box-shadow: 0 1px 3px rgba(0,120,212,0.3); }
.start-btn:hover { background: linear-gradient(135deg, #106ebe, #004578); box-shadow: 0 2px 6px rgba(0,120,212,0.4); }
.start-btn:active, .start-btn.active { background: linear-gradient(135deg, #004578, #003456); box-shadow: none; }
.start-btn-text { font-size: 16px; font-weight: 800; color: #fff; letter-spacing: 1px; text-shadow: 0 1px 2px rgba(0,0,0,0.2); }
.taskbar-apps { flex: 1; display: flex; align-items: center; gap: 2px; padding: 0 8px; overflow-x: auto; }
.taskbar-app { display: flex; align-items: center; gap: 6px; height: 40px; padding: 0 12px; border-radius: var(--radius-sm); font-size: 13px; color: var(--text-primary); transition: background var(--transition); white-space: nowrap; max-width: 180px; }
.taskbar-app:hover { background: var(--bg-hover); }
.taskbar-app.active { background: var(--bg-active); border-bottom: 2px solid var(--accent); }
.taskbar-app-icon { font-size: 18px; }
.taskbar-app-title { overflow: hidden; text-overflow: ellipsis; }
.taskbar-right { display: flex; align-items: center; gap: 4px; padding-left: 8px; }
.taskbar-tray { display: flex; align-items: center; padding: 4px 10px; border-radius: var(--radius-sm); cursor: default; }
.taskbar-tray:hover { background: var(--bg-hover); }
.tray-clock { font-size: 13px; color: var(--text-primary); }
.user-menu-btn { width: 36px; height: 36px; border-radius: 50%; overflow: hidden; display: flex; align-items: center; justify-content: center; transition: background var(--transition); }
.user-menu-btn:hover { background: var(--bg-hover); }
.user-menu-btn svg { border-radius: 50%; }

/* ===== Start Menu ===== */
.start-menu { position: fixed; bottom: calc(var(--taskbar-height) + 8px); left: 8px; width: 280px; background: var(--bg-menu); backdrop-filter: blur(40px) saturate(180%); border-radius: var(--radius); box-shadow: var(--shadow-menu); border: 1px solid var(--border-color); z-index: 1100; overflow: visible; animation: menuSlideUp 0.18s ease; }
@keyframes menuSlideUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.start-menu-header { display: flex; align-items: center; gap: 12px; padding: 16px 20px; border-bottom: 1px solid var(--border-color); }
.start-user-avatar svg { border-radius: 50%; }
.start-user-name { font-weight: 500; font-size: 14px; }
.start-menu-items { padding: 8px 0; }
.start-menu-item { display: flex; align-items: center; gap: 12px; padding: 10px 20px; cursor: pointer; transition: background var(--transition); position: relative; }
.start-menu-item:hover { background: var(--bg-hover); }
.start-menu-item .item-icon { font-size: 18px; width: 24px; text-align: center; }
.start-menu-item .item-text { flex: 1; }
.start-menu-item .item-arrow { font-size: 10px; color: var(--text-secondary); margin-left: auto; }
.start-menu-item.has-submenu:hover .item-arrow { color: var(--accent); }
.start-submenu { position: absolute; left: 100%; top: 0; width: 200px; max-height: 400px; overflow-y: auto; background: var(--bg-menu); backdrop-filter: blur(40px) saturate(180%); border-radius: var(--radius); box-shadow: var(--shadow-menu); border: 1px solid var(--border-color); padding: 8px 0; margin-left: 4px; animation: menuSlideRight 0.15s ease; }
@keyframes menuSlideRight { from { opacity: 0; transform: translateX(-8px); } to { opacity: 1; transform: translateX(0); } }
.submenu-item { display: flex; align-items: center; gap: 10px; padding: 10px 16px; cursor: pointer; transition: background var(--transition); }
.submenu-item:hover { background: var(--bg-hover); }
.submenu-item .app-icon { font-size: 18px; }
.start-app-item { display: flex; align-items: center; gap: 12px; padding: 10px 20px; cursor: pointer; transition: background var(--transition); }
.start-app-item:hover { background: var(--bg-hover); }
.app-icon { font-size: 20px; width: 28px; text-align: center; }
.start-menu-footer { padding: 8px; border-top: 1px solid var(--border-color); }
.start-footer-btn { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border-radius: var(--radius-sm); cursor: pointer; color: var(--text-secondary); transition: background var(--transition); }
.start-footer-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

/* ===== User Menu ===== */
.user-menu { position: fixed; bottom: calc(var(--taskbar-height) + 8px); right: 8px; width: 200px; background: var(--bg-menu); backdrop-filter: blur(40px) saturate(180%); border-radius: var(--radius); box-shadow: var(--shadow-menu); border: 1px solid var(--border-color); z-index: 1100; padding: 4px 0; animation: menuSlideUp 0.18s ease; }
.user-menu-item { padding: 10px 16px; cursor: pointer; transition: background var(--transition); }
.user-menu-item:hover { background: var(--bg-hover); }

/* ===== Context Menu ===== */
.context-menu { position: fixed; min-width: 180px; background: var(--bg-menu); backdrop-filter: blur(40px) saturate(180%); border-radius: var(--radius); box-shadow: var(--shadow-menu); border: 1px solid var(--border-color); z-index: 1200; padding: 4px 0; animation: menuFade 0.12s ease; }
@keyframes menuFade { from { opacity: 0; transform: scale(0.96); } to { opacity: 1; transform: scale(1); } }
.context-item { display: flex; align-items: center; gap: 10px; padding: 8px 16px; cursor: pointer; transition: background var(--transition); font-size: 13px; }
.context-item:hover { background: var(--bg-hover); }
.context-item.danger { color: var(--danger); }
.context-item.danger:hover { background: rgba(232,17,35,0.08); }
.ci-icon { font-size: 16px; width: 20px; text-align: center; }
.context-sep { height: 1px; background: var(--border-color); margin: 4px 8px; }

/* ===== Window ===== */
.window { position: absolute; background: var(--bg-window); border-radius: var(--radius); box-shadow: var(--shadow-window); display: flex; flex-direction: column; overflow: hidden; min-width: 320px; min-height: 200px; border: 1px solid var(--border-color); z-index: 100; }
.window.focused { z-index: 200; }
.window.maximized { top: 0 !important; left: 0 !important; width: 100% !important; height: calc(100vh - var(--taskbar-height)) !important; border-radius: 0; }
.window-titlebar { display: flex; align-items: center; height: 36px; background: var(--bg-titlebar); padding: 0 8px; flex-shrink: 0; cursor: default; user-select: none; }
.window-titlebar-icon { font-size: 14px; margin-right: 8px; }
.window-titlebar-text { flex: 1; font-size: 13px; color: var(--text-primary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.window-titlebar-btns { display: flex; align-items: center; gap: 0; }
.win-btn { width: 46px; height: 36px; display: flex; align-items: center; justify-content: center; transition: background var(--transition); font-size: 12px; color: var(--text-secondary); }
.win-btn:hover { background: var(--bg-hover); }
.win-btn.close:hover { background: var(--danger); color: #fff; }
.window-body { flex: 1; overflow: auto; position: relative; display: flex; flex-direction: column; }

/* Resize handles */
.window .resize-handle { position: absolute; z-index: 5; }
.resize-handle.n { top: -3px; left: 8px; right: 8px; height: 6px; cursor: n-resize; }
.resize-handle.s { bottom: -3px; left: 8px; right: 8px; height: 6px; cursor: s-resize; }
.resize-handle.e { right: -3px; top: 8px; bottom: 8px; width: 6px; cursor: e-resize; }
.resize-handle.w { left: -3px; top: 8px; bottom: 8px; width: 6px; cursor: w-resize; }
.resize-handle.ne { top: -3px; right: -3px; width: 12px; height: 12px; cursor: ne-resize; }
.resize-handle.nw { top: -3px; left: -3px; width: 12px; height: 12px; cursor: nw-resize; }
.resize-handle.se { bottom: -3px; right: -3px; width: 12px; height: 12px; cursor: se-resize; }
.resize-handle.sw { bottom: -3px; left: -3px; width: 12px; height: 12px; cursor: sw-resize; }

/* ===== File Manager Window ===== */
.fm-toolbar { display: flex; align-items: center; gap: 4px; padding: 6px 12px; border-bottom: 1px solid var(--border-color); background: var(--bg-titlebar); }
.fm-toolbar-btn { display: flex; align-items: center; gap: 4px; padding: 6px 10px; border-radius: var(--radius-sm); font-size: 13px; transition: background var(--transition); }
.fm-toolbar-btn:hover { background: var(--bg-hover); }
.fm-breadcrumb { flex: 1; display: flex; align-items: center; gap: 2px; padding: 4px 8px; font-size: 13px; overflow: hidden; }
.fm-breadcrumb-item { cursor: pointer; padding: 2px 6px; border-radius: var(--radius-sm); white-space: nowrap; transition: background var(--transition); }
.fm-breadcrumb-item:hover { background: var(--bg-hover); }
.fm-breadcrumb-sep { color: var(--text-muted); }
.fm-content { display: flex; height: 100%; }
.fm-sidebar { width: 180px; border-right: 1px solid var(--border-color); padding: 8px 0; overflow-y: auto; flex-shrink: 0; }
.fm-sidebar-item { display: flex; align-items: center; gap: 8px; padding: 7px 14px; cursor: pointer; font-size: 13px; transition: background var(--transition); }
.fm-sidebar-item:hover { background: var(--bg-hover); }
.fm-sidebar-item.active { background: var(--bg-active); font-weight: 500; }
.fm-sidebar-icon { font-size: 16px; }
.fm-main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.fm-list { flex: 1; overflow-y: auto; padding: 4px; }
.fm-item { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-radius: var(--radius-sm); cursor: pointer; transition: background var(--transition); user-select: none; }
.fm-item:hover { background: var(--bg-hover); }
.fm-item.selected { background: rgba(0,120,212,0.12); outline: 1px solid rgba(0,120,212,0.3); }
.fm-item-icon { font-size: 24px; width: 30px; text-align: center; }
.fm-item-name { flex: 1; font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fm-item-size { font-size: 12px; color: var(--text-muted); width: 80px; text-align: right; }
.fm-item-date { font-size: 12px; color: var(--text-muted); width: 120px; text-align: right; }
.fm-empty { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100%; color: var(--text-muted); gap: 8px; }
.fm-empty-icon { font-size: 48px; opacity: 0.5; }
.fm-statusbar { display: flex; align-items: center; padding: 4px 12px; border-top: 1px solid var(--border-color); font-size: 12px; color: var(--text-muted); }

/* ===== Shared Files Window ===== */
.shared-list { padding: 12px; }
.shared-item { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-radius: var(--radius-sm); border: 1px solid var(--border-color); margin-bottom: 8px; transition: background var(--transition); }
.shared-item:hover { background: var(--bg-hover); }
.shared-item-icon { font-size: 28px; }
.shared-item-info { flex: 1; }
.shared-item-name { font-size: 14px; font-weight: 500; }
.shared-item-meta { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.shared-item-perm { font-size: 12px; padding: 2px 8px; border-radius: 10px; background: rgba(0,120,212,0.1); color: var(--accent); }
.shared-empty { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100%; color: var(--text-muted); gap: 8px; padding: 40px; }
.shared-empty-icon { font-size: 48px; opacity: 0.5; }

/* ===== User Admin Window ===== */
.ua-header { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid var(--border-color); }
.ua-title { font-size: 16px; font-weight: 600; }
.ua-add-btn { padding: 6px 16px; background: var(--accent); color: #fff; border-radius: var(--radius-sm); font-size: 13px; }
.ua-add-btn:hover { background: var(--accent-hover); }
.ua-list { padding: 8px 12px; }
.ua-item { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-radius: var(--radius-sm); border: 1px solid var(--border-color); margin-bottom: 8px; }
.ua-item-avatar { width: 36px; height: 36px; border-radius: 50%; background: var(--bg-titlebar); display: flex; align-items: center; justify-content: center; font-size: 18px; }
.ua-item-info { flex: 1; }
.ua-item-name { font-weight: 500; }
.ua-item-meta { font-size: 12px; color: var(--text-muted); }
.ua-item-actions { display: flex; gap: 6px; }
.ua-btn { padding: 4px 12px; border-radius: var(--radius-sm); font-size: 12px; transition: background var(--transition); }
.ua-btn:hover { background: var(--bg-hover); }
.ua-btn.danger { color: var(--danger); }
.ua-btn.danger:hover { background: rgba(232,17,35,0.08); }

/* ===== Settings Window ===== */
.settings-layout { display: flex; height: 100%; }
.settings-nav { width: 200px; border-right: 1px solid var(--border-color); padding: 12px 0; overflow-y: auto; }
.settings-nav-item { display: flex; align-items: center; gap: 10px; padding: 10px 16px; cursor: pointer; font-size: 13px; transition: background var(--transition); }
.settings-nav-item:hover { background: var(--bg-hover); }
.settings-nav-item.active { background: var(--bg-active); font-weight: 500; color: var(--accent); }
.settings-panel { flex: 1; padding: 20px 24px; overflow-y: auto; }
.settings-title { font-size: 18px; font-weight: 600; margin-bottom: 20px; }
.settings-group { margin-bottom: 20px; }
.settings-group-title { font-size: 14px; font-weight: 500; margin-bottom: 10px; color: var(--text-secondary); }
.settings-row { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; border-bottom: 1px solid var(--border-color); }
.settings-row:last-child { border-bottom: none; }
.settings-label { font-size: 14px; }
.settings-desc { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.settings-input { padding: 6px 10px; border: 1px solid var(--border-color); border-radius: var(--radius-sm); background: var(--bg-secondary); color: var(--text-primary); font-size: 14px; outline: none; }
.settings-input:focus { border-color: var(--accent); }
.settings-select { padding: 6px 10px; border: 1px solid var(--border-color); border-radius: var(--radius-sm); background: var(--bg-secondary); color: var(--text-primary); font-size: 14px; outline: none; }
.settings-btn { padding: 8px 20px; background: var(--accent); color: #fff; border-radius: var(--radius-sm); font-size: 14px; transition: background var(--transition); }
.settings-btn:hover { background: var(--accent-hover); }
.settings-btn.secondary { background: var(--bg-hover); color: var(--text-primary); }

/* Wallpaper grid */
.wallpaper-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.wallpaper-item { aspect-ratio: 16/9; border-radius: var(--radius-sm); overflow: hidden; cursor: pointer; border: 2px solid transparent; transition: border-color var(--transition); background-size: cover; background-position: center; }
.wallpaper-item:hover { border-color: var(--accent); }
.wallpaper-item.active { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent); }

/* ===== Dialog / Modal ===== */
.dialog-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.3); z-index: 1500; display: flex; align-items: center; justify-content: center; }
.dialog { background: var(--bg-window); border-radius: var(--radius); box-shadow: var(--shadow-window); min-width: 360px; max-width: 520px; padding: 24px; max-height: 80vh; overflow-y: auto; }
.dialog-title { font-size: 16px; font-weight: 600; margin-bottom: 16px; }
.dialog-input { width: 100%; padding: 8px 12px; border: 2px solid var(--border-color); border-radius: var(--radius-sm); font-size: 14px; outline: none; margin-bottom: 12px; background: var(--bg-secondary); color: var(--text-primary); }
.dialog-input:focus { border-color: var(--accent); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 8px; }
.dialog-btn { padding: 8px 20px; border-radius: var(--radius-sm); font-size: 14px; transition: background var(--transition); }
.dialog-btn.primary { background: var(--accent); color: #fff; }
.dialog-btn.primary:hover { background: var(--accent-hover); }
.dialog-btn.cancel { background: var(--bg-hover); color: var(--text-primary); }
.dialog-btn.success { background: var(--success); color: #fff; }

/* Internal share user list */
.share-user-list { max-height: 300px; overflow-y: auto; }
.share-user-item { display: flex; align-items: center; gap: 10px; padding: 8px 4px; border-bottom: 1px solid var(--border-color); }
.share-user-item:last-child { border-bottom: none; }
.share-user-check { width: 18px; height: 18px; accent-color: var(--accent); }
.share-user-info { flex: 1; }
.share-user-name { font-size: 14px; }
.share-user-username { font-size: 12px; color: var(--text-muted); }
.share-selected-info { font-size: 13px; color: var(--text-secondary); margin-bottom: 12px; }

/* External share result */
.share-result { background: var(--bg-titlebar); border-radius: var(--radius-sm); padding: 12px; margin-top: 12px; }
.share-result-label { font-size: 12px; color: var(--text-muted); margin-bottom: 4px; }
.share-result-value { font-size: 14px; word-break: break-all; display: flex; align-items: center; gap: 8px; }
.share-result-value button { font-size: 12px; color: var(--accent); padding: 2px 8px; border: 1px solid var(--accent); border-radius: var(--radius-sm); }

/* ===== Notepad ===== */
.notepad-textarea { width: 100%; height: 100%; border: none; outline: none; padding: 12px; font-family: 'Menlo', 'Consolas', monospace; font-size: 14px; resize: none; background: var(--bg-window); color: var(--text-primary); line-height: 1.6; }

/* ===== Terminal ===== */
.terminal-body { width: 100%; height: 100%; background: #1e1e1e; color: #0f0; font-family: 'Menlo', 'Consolas', monospace; font-size: 13px; padding: 12px; overflow-y: auto; line-height: 1.5; }
.terminal-line { white-space: pre-wrap; word-break: break-all; }
.terminal-input-line { display: flex; align-items: center; }
.terminal-prompt { color: #0f0; margin-right: 8px; }
.terminal-input { flex: 1; background: transparent; border: none; outline: none; color: #0f0; font: inherit; }

/* ===== Calculator ===== */
.calc-display { background: #f5f5f5; padding: 16px; border-bottom: 1px solid var(--border-color); }
.calc-display input { width: 100%; font-size: 32px; text-align: right; border: none; background: transparent; outline: none; font-family: 'SF Pro Display', -apple-system, sans-serif; }
.calc-buttons { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: #d1d1d1; padding: 1px; }
.calc-btn { padding: 20px; font-size: 20px; border: none; background: #fff; cursor: pointer; transition: background 0.1s; }
.calc-btn:hover { background: #f0f0f0; }
.calc-btn:active { background: #e0e0e0; }
.calc-btn.op { background: #f9a825; color: #fff; }
.calc-btn.op:hover { background: #f57f17; }
.calc-btn.eq { background: var(--accent); color: #fff; }
.calc-btn.eq:hover { background: var(--accent-hover); }
.calc-btn.zero { grid-column: span 2; }

/* ===== Browser ===== */
.browser-toolbar { display: flex; align-items: center; gap: 8px; padding: 8px 12px; background: var(--bg-secondary); border-bottom: 1px solid var(--border-color); flex-shrink: 0; flex-wrap: wrap; }
.browser-nav { display: flex; gap: 4px; flex-shrink: 0; flex-wrap: wrap; }
.browser-btn { width: 32px; height: 32px; border: none; background: var(--bg); border-radius: 6px; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 14px; transition: background var(--transition); flex-shrink: 0; }
.browser-btn:hover { background: var(--bg-hover); }
.browser-btn:active { background: var(--border-color); }
.browser-btn-text { font-size: 12px; padding: 0 8px; width: auto; white-space: nowrap; }
.browser-btn:hover { background: var(--bg-hover); }
.browser-btn:active { background: var(--border-color); }
.browser-url-bar { flex: 1; min-width: 200px; display: flex; gap: 6px; }
.browser-url-bar input { flex: 1; padding: 6px 12px; border: 1px solid var(--border-color); border-radius: 6px; font-size: 13px; outline: none; transition: border-color var(--transition); }
.browser-url-bar input:focus { border-color: var(--accent); }
.browser-go { padding: 6px 16px; background: var(--accent); color: #fff; border: none; border-radius: 6px; cursor: pointer; font-size: 13px; transition: background var(--transition); }
.browser-go:hover { background: var(--accent-hover); }
.browser-main { display: flex; flex: 1; overflow: hidden; min-height: 0; }
.browser-sidebar { width: 180px; min-width: 140px; background: var(--bg-secondary); border-right: 1px solid var(--border-color); padding: 12px 8px; overflow-y: auto; flex-shrink: 0; }
.browser-bookmarks-title { font-size: 13px; font-weight: 600; color: var(--text-muted); margin-bottom: 8px; padding: 0 8px; }
.browser-bookmark { padding: 8px 12px; cursor: pointer; border-radius: 6px; font-size: 13px; transition: background var(--transition); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.browser-bookmark:hover { background: var(--bg-hover); }
.browser-bookmark .bookmark-name { flex: 1; overflow: hidden; text-overflow: ellipsis; }
.browser-bookmark .bookmark-delete { opacity: 0; color: #e74c3c; font-size: 12px; padding: 2px 4px; border-radius: 3px; transition: all var(--transition); flex-shrink: 0; }
.browser-bookmark:hover .bookmark-delete { opacity: 1; }
.browser-bookmark .bookmark-delete:hover { background: rgba(231,76,60,0.15); }
.browser-content { flex: 1; min-width: 0; position: relative; overflow: hidden; display: flex; flex-direction: column; }
.browser-content iframe { width: 100%; height: 100%; border: none; background: #fff; flex: 1; min-width: 0; transform: translateZ(0); will-change: transform; backface-visibility: hidden; }
.browser-welcome { position: absolute; top: 0; left: 0; right: 0; bottom: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; background: var(--bg); padding: 40px; overflow-y: auto; }
.browser-welcome.hide { display: none; }
.browser-welcome-title { font-size: 28px; font-weight: 600; margin-bottom: 24px; color: var(--text); }
.browser-welcome-subtitle { font-size: 14px; color: var(--text-muted); margin-bottom: 16px; }
.browser-quick-links { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }
.browser-quick-link { width: 100px; padding: 16px; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 12px; cursor: pointer; text-align: center; transition: all var(--transition); }
.browser-quick-link:hover { background: var(--bg-hover); border-color: var(--accent); transform: translateY(-2px); }
.browser-quick-icon { font-size: 32px; margin-bottom: 8px; }
.browser-quick-name { font-size: 12px; color: var(--text); }

/* Browser Responsive */
@media (max-width: 600px) {
    .browser-sidebar { display: none; }
    .browser-welcome { padding: 20px; }
    .browser-welcome-title { font-size: 20px; }
    .browser-quick-links { gap: 10px; }
    .browser-quick-link { width: 80px; padding: 12px; }
    .browser-quick-icon { font-size: 24px; }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.15); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,0.25); }
[data-theme="dark"] ::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); }
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.25); }

/* ===== Animations ===== */
.window-open { animation: winOpen 0.2s ease; }
@keyframes winOpen { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }





/* ===== Org & User Admin (merged) ===== */
.org-sidebar-tree { }
.org-sidebar-node { }
.org-sidebar-row { display: flex; align-items: center; gap: 6px; padding: 6px 8px; cursor: pointer; transition: background var(--transition); font-size: 13px; border-left: 3px solid transparent; }
.org-sidebar-row:hover { background: var(--bg-hover); }
.org-sidebar-row.selected { background: rgba(0,120,212,0.1); border-left-color: var(--accent); color: var(--accent); font-weight: 500; }
.org-sidebar-toggle { width: 14px; text-align: center; font-size: 10px; color: var(--text-muted); cursor: pointer; user-select: none; flex-shrink: 0; }
.org-sidebar-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.org-sidebar-count { font-size: 11px; color: var(--text-muted); background: var(--bg-hover); padding: 0 6px; border-radius: 8px; flex-shrink: 0; }
.org-sidebar-admin { font-size: 11px; color: #e67e22; padding: 2px 0 4px 26px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.org-sidebar-node.collapsed > .org-sidebar-children { display: none; }
.org-sidebar-children { }


/* ===== OUA Context Menus ===== */
#oua-org-ctx, #oua-user-ctx { position: fixed; z-index: 2000; }

/* ===== Notepad Toolbar ===== */
.np-btn { display: flex; align-items: center; gap: 4px; padding: 4px 10px; border-radius: var(--radius-sm); font-size: 12px; color: var(--text-secondary); cursor: pointer; transition: background var(--transition); }
.np-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

/* Sidebar default hidden, toggled by JS */
.browser-sidebar { display: none; }
/* Add bookmark button in sidebar */
.browser-bookmark-add {
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    color: var(--accent);
    text-align: center;
    border: 1px dashed var(--accent);
    margin-bottom: 8px;
    transition: all 0.2s;
}
.browser-bookmark-add:hover {
    background: var(--bg-hover);
    border-style: solid;
}

/* ===== Task List App ===== */
.task-app {
    display: flex;
    height: 100%;
    overflow: hidden;
}
.task-sidebar {
    width: 280px;
    min-width: 200px;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    transition: width 0.2s;
}
.task-sidebar.full-width {
    width: 100%;
    border-right: none;
}
.task-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 15px;
}
.task-sidebar-search {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
}
.task-search-input {
    width: 100%;
    padding: 7px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 13px;
    outline: none;
    background: var(--bg-primary);
    box-sizing: border-box;
}
.task-search-input:focus {
    border-color: var(--accent);
}
.task-add-btn {
    font-size: 18px;
    padding: 2px 8px;
    border-radius: 6px;
    background: var(--accent);
    color: #fff;
    transition: background 0.15s;
}
.task-add-btn:hover { background: var(--accent-hover); }
.task-list {
    flex: 1;
    overflow-y: auto;
    padding: 10px 12px;
}
.task-item {
    padding: 12px 14px;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 6px;
    transition: background 0.15s;
    display: flex;
    align-items: center;
    gap: 10px;
}
.task-item:hover { background: var(--bg-hover); }
.task-item.active { background: var(--bg-active); border-left: 3px solid var(--accent); padding-left: 11px; }
.task-item-header {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    min-width: 0;
}
.task-item-status { font-size: 15px; flex-shrink: 0; }
.task-item-title {
    font-size: 14px;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}
.task-item-meta {
    display: flex;
    gap: 12px;
    font-size: 12px;
    color: var(--text-muted);
    flex-shrink: 0;
    align-items: center;
}
.task-priority { font-weight: 500; }
.task-progress { color: var(--text-muted); }

/* Main area */
.task-main {
    flex: 1;
    display: none;
    flex-direction: column;
    overflow: hidden;
    border-left: 1px solid var(--border-color);
}
.task-empty {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 16px;
}
.task-main-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}
.task-main-title-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}
.task-main-title {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
}
.task-main-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 12px;
    color: var(--text-secondary);
}
.task-btn-sm {
    font-size: 14px;
    padding: 2px 6px;
    border-radius: 4px;
    transition: background 0.15s;
}
.task-btn-sm:hover { background: var(--bg-hover); }
.task-btn-sm.danger:hover { color: var(--danger); }

/* Add task section (top of items area) */
.task-add-section {
    display: flex;
    gap: 8px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 8px;
}
.task-add-section .task-input {
    flex: 1;
    padding: 10px 14px;
    font-size: 14px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.15s;
}
.task-add-section .task-input:focus { border-color: var(--accent); }
.task-add-section .task-btn.primary {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
}
.task-add-section .task-btn.primary:hover { background: var(--accent-hover); }

/* Items area */
.task-items-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding: 0 20px 12px;
}
.task-items-list {
    flex: 1;
    overflow-y: auto;
    padding-right: 4px;
}
.task-item-input-row {
    display: flex;
    gap: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    margin-top: 8px;
}
.task-input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.15s;
}
.task-input:focus { border-color: var(--accent); }
.task-btn {
    padding: 8px 16px;
    border-radius: 6px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 13px;
    transition: all 0.15s;
}
.task-btn:hover { background: var(--bg-hover); }
.task-btn.primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.task-btn.primary:hover { background: var(--accent-hover); }

/* Check item */
.task-check-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border-radius: 8px;
    margin-bottom: 4px;
    transition: background 0.15s;
    flex-wrap: wrap;
}
.task-check-item:hover { background: var(--bg-hover); }
.task-check-item.done .task-check-content {
    text-decoration: line-through;
    color: var(--text-muted);
}
.task-item-edit-btn {
    font-size: 12px;
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.15s;
    padding: 2px 4px;
    flex-shrink: 0;
}
.task-check-item:hover .task-item-edit-btn { opacity: 0.5; }
.task-item-edit-btn:hover { opacity: 1 !important; }
.task-check-left {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    min-width: 0;
}
.task-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent);
    flex-shrink: 0;
}
.task-check-content {
    font-size: 14px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.task-check-right {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
    font-size: 12px;
}
.task-assignee-tag,
.task-status-tag,
.task-time-tag {
    padding: 2px 8px;
    border-radius: 10px;
    background: var(--bg-primary);
    font-size: 11px;
    white-space: nowrap;
}
.task-item-expand {
    font-size: 10px;
    padding: 2px 4px;
    border-radius: 4px;
    transition: background 0.15s;
}
.task-item-expand:hover { background: var(--bg-active); }

/* Item detail panel */
.task-item-detail {
    width: 100%;
    margin-top: 8px;
    padding: 12px;
    background: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}
.task-detail-row {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 8px;
    font-size: 13px;
}
.task-detail-row label {
    min-width: 70px;
    color: var(--text-secondary);
    padding-top: 4px;
    flex-shrink: 0;
}
.task-detail-desc {
    flex: 1;
    min-height: 60px;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 13px;
    resize: vertical;
    outline: none;
}
.task-detail-desc:focus { border-color: var(--accent); }
.task-detail-assignees { flex: 1; color: var(--text-secondary); padding-top: 4px; }
.task-assign-area { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.task-assign-hint { font-size: 11px; color: var(--accent); opacity: 0.8; }
.task-priority-select {
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 13px;
}

/* Color picker */
.task-color-picker {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    padding-top: 2px;
}
.task-color-dot {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: border-color 0.15s, transform 0.15s;
}
.task-color-dot:hover { transform: scale(1.2); }
.task-color-dot.active { border-color: var(--accent); transform: scale(1.15); }

/* Subitems */
.task-subitems {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
}
.task-subitems-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}
.task-subitems-header label { min-width: 70px; color: var(--text-secondary); font-size: 13px; }
.task-subitem {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 0;
    font-size: 13px;
}
.task-subitem.done span:nth-child(2) { text-decoration: line-through; color: var(--text-muted); }
.task-sub-checkbox { accent-color: var(--accent); width: 14px; height: 14px; cursor: pointer; }
.task-sub-del {
    font-size: 12px;
    color: var(--text-muted);
    margin-left: auto;
    padding: 2px 4px;
}
.task-sub-del:hover { color: var(--danger); }
.task-sub-edit {
    font-size: 12px;
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0.4;
    transition: opacity 0.15s;
    padding: 2px 4px;
    margin-left: 4px;
}
.task-subitem:hover .task-sub-edit { opacity: 1; }
.task-sub-edit:hover { opacity: 1 !important; }

/* Dialog overlay */
.task-dialog-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100000;
}
.task-dialog {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 24px;
    min-width: 320px;
    max-width: 480px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-window);
}
.task-dialog h3 {
    margin-bottom: 16px;
    font-size: 16px;
}
.task-dialog-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin-top: 16px;
}
.task-log-dialog {
    max-width: 520px;
}
.task-log-timeline {
    max-height: 50vh;
    overflow-y: auto;
    padding-right: 8px;
}
.task-log-empty {
    text-align: center;
    color: var(--text-muted);
    padding: 30px 0;
    font-size: 14px;
}
.task-log-entry {
    display: flex;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    align-items: flex-start;
}
.task-log-entry:last-child {
    border-bottom: none;
}
.task-log-dot {
    font-size: 18px;
    line-height: 1.4;
    flex-shrink: 0;
    width: 28px;
    text-align: center;
}
.task-log-body {
    flex: 1;
    min-width: 0;
}
.task-log-text {
    font-size: 13px;
    line-height: 1.5;
    color: var(--text-primary);
    word-break: break-word;
}
.task-log-time {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 2px;
}
.task-user-list {
    max-height: 300px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.task-user-option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: background 0.15s;
}
.task-user-option:hover { background: var(--bg-hover); }
.task-user-option input[type=checkbox] { accent-color: var(--accent); }

/* ==================== KairOS 阅读 App ==================== */
.book-app { display:flex; height:100%; overflow:hidden; }
.book-sidebar { width:280px; min-width:200px; border-right:1px solid var(--border-color); display:flex; flex-direction:column; background:var(--bg-secondary); transition:width 0.2s; }
.book-sidebar.full-width { width:100%; border-right:none; }
.book-sidebar-header { display:flex; align-items:center; justify-content:space-between; padding:14px 20px; border-bottom:1px solid var(--border-color); font-weight:600; font-size:15px; }
.book-add-btn { background:none; border:none; font-size:18px; cursor:pointer; padding:4px 8px; border-radius:6px; }
.book-add-btn:hover { background:var(--bg-hover); }
.book-sidebar-search { padding:10px 12px; }
.book-search-input { width:100%; padding:8px 12px; border:1px solid var(--border-color); border-radius:8px; background:var(--bg-primary); color:var(--text-primary); font-size:13px; box-sizing:border-box; outline:none; }
.book-search-input:focus { border-color:var(--accent); }
.book-list { flex:1; overflow-y:auto; padding:8px; }
.book-empty-sidebar { text-align:center; padding:40px 20px; color:var(--text-secondary); font-size:13px; }
.book-item { display:flex; align-items:center; gap:10px; padding:10px 12px; border-radius:8px; cursor:pointer; transition:background 0.15s; margin-bottom:4px; }
.book-item:hover { background:var(--bg-hover); }
.book-item.active { background:var(--accent); color:#fff; }
.book-item.active .book-item-meta { color:rgba(255,255,255,0.7); }
.book-item-logo-placeholder { width:32px; height:32px; border-radius:6px; background:linear-gradient(135deg,#1a1a2e,#16213e); color:#fff; display:flex; align-items:center; justify-content:center; font-weight:700; font-size:16px; flex-shrink:0; }
.book-item-info { flex:1; min-width:0; }
.book-item-name { font-size:13px; font-weight:500; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.book-item-meta { font-size:11px; color:var(--text-secondary); margin-top:2px; }

/* 主区域 */
.book-main { flex:1; display:none; flex-direction:column; overflow:hidden; border-left:1px solid var(--border-color); }
.book-empty { display:flex; align-items:center; justify-content:center; height:100%; color:var(--text-secondary); font-size:14px; }
.book-loading { display:flex; align-items:center; justify-content:center; height:100%; color:var(--text-secondary); }

/* 详情头部 */
.book-detail-header { padding:20px; border-bottom:1px solid var(--border-color); background:var(--bg-secondary); }
.book-back-btn { display:none; background:none; border:1px solid var(--border-color); padding:4px 10px; border-radius:6px; cursor:pointer; margin-bottom:10px; font-size:14px; color:var(--text-primary); }
.book-back-btn:hover { background:var(--bg-hover); }
.book-detail-title-row { display:flex; align-items:center; gap:14px; margin-bottom:16px; }
.book-detail-logo-placeholder { width:64px; height:64px; border-radius:12px; background:linear-gradient(135deg,#1a1a2e,#16213e); color:#fff; display:flex; align-items:center; justify-content:center; font-weight:700; font-size:28px; flex-shrink:0; }
.book-detail-info { flex:1; min-width:0; }
.book-detail-info h2 { margin:0; font-size:18px; font-weight:600; }
.book-detail-meta { font-size:12px; color:var(--text-secondary); margin-top:4px; }
.book-detail-actions { display:flex; gap:10px; flex-wrap:wrap; }
.book-action-btn { padding:10px 20px; border:none; border-radius:10px; color:#fff; font-size:14px; font-weight:500; cursor:pointer; transition:opacity 0.15s; }
.book-action-btn:hover { opacity:0.85; }
.book-action-btn.content-btn { flex:1; min-width:80px; }
.book-action-btn.edit-btn { background:#0078d4; flex:1; min-width:80px; }
.book-action-btn.share-btn { background:#107c10; flex:1; min-width:80px; }
.book-action-btn.delete-btn { flex:1; min-width:80px; }

/* 详情体 */
.book-detail-body { flex:1; overflow-y:auto; padding:0; }

/* 内容面板 */
.book-content-panel { padding:16px; }
.book-upload-section { margin-bottom:16px; }
.book-upload-row { display:flex; gap:10px; flex-wrap:wrap; }
.book-upload-btn { display:inline-flex; align-items:center; gap:4px; padding:8px 14px; border:1px solid var(--border-color); border-radius:8px; cursor:pointer; font-size:13px; background:var(--bg-secondary); color:var(--text-primary); transition:background 0.15s; }
.book-upload-btn:hover { background:var(--bg-hover); }
.book-pages-grid { display:grid; grid-template-columns:repeat(auto-fill, minmax(140px, 1fr)); gap:12px; }
.book-page-card { position:relative; border-radius:8px; overflow:hidden; border:1px solid var(--border-color); background:var(--bg-secondary); cursor:grab; transition:box-shadow 0.15s; }
.book-page-card:hover { box-shadow:0 2px 8px rgba(0,0,0,0.12); }
.book-page-card.dragging { opacity:0.4; }
.book-page-thumb { width:100%; height:180px; object-fit:contain; background:#f5f5f5; display:block; }
.book-page-title-input { padding:4px 6px; }
.book-page-title-input input { width:100%; border:none; background:transparent; font-size:12px; color:var(--text-primary); outline:none; padding:2px 4px; }
.book-page-title-input input:focus { background:var(--bg-primary); border-radius:4px; }
.book-page-order { position:absolute; top:4px; left:4px; background:rgba(0,0,0,0.6); color:#fff; font-size:10px; padding:2px 6px; border-radius:4px; }
.book-page-del { position:absolute; top:4px; right:4px; width:24px; height:24px; background:rgba(220,20,20,0.7); color:#fff; font-size:14px; border-radius:50%; display:none; align-items:center; justify-content:center; cursor:pointer; z-index:2; line-height:1; }
.book-page-card:hover .book-page-del { display:flex; }
.book-page-del:hover { background:rgba(220,20,20,0.95); }
.book-uploading-hint { padding:20px; text-align:center; color:var(--text-secondary); font-size:13px; }

/* 编辑面板 */
.book-edit-panel { padding:20px; }
.book-edit-form { max-width:480px; }
.book-edit-row { margin-bottom:16px; }
.book-edit-row label { display:block; font-size:13px; font-weight:500; color:var(--text-secondary); margin-bottom:6px; }
.book-edit-row input[type="text"] { width:100%; padding:8px 12px; border:1px solid var(--border-color); border-radius:8px; background:var(--bg-primary); color:var(--text-primary); font-size:14px; box-sizing:border-box; outline:none; }
.book-edit-row input[type="color"] { width:60px; height:36px; border:1px solid var(--border-color); border-radius:8px; cursor:pointer; padding:2px; }
.book-logo-upload { display:flex; align-items:center; }
.book-music-upload { display:flex; align-items:center; }
.book-save-btn { padding:10px 24px; background:var(--accent); color:#fff; border:none; border-radius:8px; font-size:14px; font-weight:500; cursor:pointer; margin-top:8px; }
.book-save-btn:hover { opacity:0.85; }

/* 分享面板 */
.book-share-panel { padding:30px; text-align:center; }
.book-share-title { font-size:18px; font-weight:600; margin-bottom:20px; }
.book-share-qrcode { display:flex; justify-content:center; margin-bottom:20px; min-height:180px; align-items:center; }
.book-share-qrcode img { border-radius:8px; }
.book-share-link { color:var(--accent); word-break:break-all; font-size:13px; }
.book-share-url { display:flex; gap:8px; max-width:420px; margin:0 auto 12px; }
.book-share-url input { flex:1; padding:8px 12px; border:1px solid var(--border-color); border-radius:8px; background:var(--bg-primary); color:var(--text-primary); font-size:13px; outline:none; }
.book-share-meta { font-size:12px; color:var(--text-secondary); }

/* 手机适配 */
@media (max-width: 768px) {
    .book-sidebar.mobile-hidden { display:none !important; }
    .book-back-btn { display:inline-flex !important; }
    .book-detail-actions { flex-wrap:wrap; }
    .book-action-btn { padding:12px 16px; font-size:13px; }
}

/* PDF 查看器 */
.pdf-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: var(--bg-secondary, #f5f5f5);
    border-bottom: 1px solid var(--border-color, #e0e0e0);
    flex-shrink: 0;
}
.pdf-btn {
    background: var(--accent, #3498db);
    color: #fff;
    border: none;
    padding: 5px 10px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    min-width: 32px;
    transition: opacity 0.15s;
}
.pdf-btn:hover { opacity: 0.8; }
.pdf-zoom-level { font-size: 13px; color: var(--text-secondary, #666); min-width: 48px; text-align: center; }
.pdf-nav-btns { display: flex; align-items: center; gap: 6px; }
.pdf-page-info { font-size: 13px; color: var(--text-secondary, #666); }
.pdf-pages {
    flex: 1;
    overflow: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px;
    background: #525659;
    gap: 12px;
    min-height: 0;
    -webkit-overflow-scrolling: touch;
}
.pdf-page-wrapper {
    display: flex;
    justify-content: center;
}
.pdf-page-canvas {
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    background: #fff;
    max-width: 100%;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* 移动端响应式 */
@media (max-width: 768px) {
    .pdf-toolbar {
        flex-wrap: wrap;
        padding: 6px 10px;
        gap: 6px;
    }
    .pdf-btn {
        padding: 6px 12px;
        font-size: 16px;
        min-width: 40px;
    }
    .pdf-zoom-level-span {
        font-size: 14px;
    }
    .pdf-page-input {
        width: 50px;
        font-size: 14px;
    }
    .pdf-pages {
        padding: 8px;
        gap: 10px;
    }
    .pdf-page-wrapper {
        width: 100%;
    }
    .pdf-page-canvas {
        width: 100% !important;
        height: auto !important;
    }
}
.pdf-loading {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    color: #fff;
    font-size: 16px;
    background: rgba(0,0,0,0.5);
    z-index: 10;
}
.pdf-spinner {
    width: 40px; height: 40px;
    border: 3px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== PDF Viewer Enhancements ===== */
.pdf-toolbar-hidden { display: none !important; }
.pdf-pages-hidden { display: none !important; }
.pdf-welcome {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 14px;
    background: #525659;
    color: #ddd;
    padding: 40px 20px;
    min-height: 0;
}
.pdf-welcome-icon { font-size: 64px; line-height: 1; opacity: 0.7; }
.pdf-welcome-title { font-size: 22px; font-weight: 600; color: #fff; }
.pdf-welcome-desc { font-size: 14px; color: #bbb; text-align: center; line-height: 1.7; }
.pdf-welcome-open-btn {
    margin-top: 8px;
    background: var(--accent, #0078d4);
    color: #fff;
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    transition: opacity 0.15s;
}
.pdf-welcome-open-btn:hover { opacity: 0.85; }
.pdf-welcome-drop { font-size: 12px; color: #888; margin-top: 4px; }
.pdf-page-input {
    width: 52px;
    text-align: center;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 5px;
    background: rgba(255,255,255,0.15);
    color: #fff;
    padding: 3px 6px;
    font-size: 13px;
    -moz-appearance: textfield;
}
.pdf-page-input::-webkit-outer-spin-button,
.pdf-page-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.pdf-page-input:focus { outline: none; border-color: var(--accent, #0078d4); background: rgba(255,255,255,0.25); }
.pdf-page-total { font-size: 13px; color: var(--text-secondary, #666); }
.pdf-drag-over .window-body { outline: 3px dashed var(--accent, #0078d4); outline-offset: -3px; }

/* ===== Word App ===== */
.word-app { display: flex; flex-direction: column; height: 100%; }
.word-toolbar {
    display: flex; align-items: center; gap: 4px; padding: 6px 10px;
    border-bottom: 1px solid var(--border-color); background: var(--bg-titlebar);
    flex-shrink: 0; flex-wrap: wrap;
}
.word-btn { padding: 4px 10px; border-radius: 4px; font-size: 13px; }
.word-btn:hover { background: var(--bg-hover); }
.word-btn[data-cmd="bold"] { font-weight: bold; }
.word-btn[data-cmd="italic"] { font-style: italic; }
.word-btn[data-cmd="underline"] { text-decoration: underline; }
.word-font, .word-size { padding: 3px 6px; border: 1px solid var(--border-color); border-radius: 4px; font-size: 13px; }
.word-editor:focus { outline: none; }
.word-editor p { margin-bottom: 8px; }

/* ===== Excel App ===== */
.excel-app { display: flex; flex-direction: column; height: 100%; }
.excel-toolbar {
    display: flex; align-items: center; gap: 8px; padding: 6px 10px;
    border-bottom: 1px solid var(--border-color); background: var(--bg-titlebar);
    flex-shrink: 0;
}
.excel-grid { flex: 1; overflow: auto; background: #fff; }
.excel-table { border-collapse: collapse; font-size: 13px; }
.ec-corner { width: 40px; min-width: 40px; background: var(--bg-titlebar); border: 1px solid #d0d0d0; }
.ec-colhdr, .ec-rowhdr {
    min-width: 80px; width: 80px; height: 28px;
    background: #f5f5f5; border: 1px solid #d0d0d0;
    text-align: center; font-weight: 500; font-size: 12px;
    user-select: none; position: sticky; top: 0; z-index: 1;
}
.ec-colhdr { position: sticky; top: 0; z-index: 2; }
.ec-rowhdr { position: sticky; left: 0; z-index: 1; background: #f5f5f5; }
.ec-cell {
    min-width: 80px; width: 80px; height: 24px;
    border: 1px solid #e0e0e0; padding: 2px 4px;
    cursor: cell; vertical-align: middle; overflow: hidden;
}
.ec-cell:hover { background: #f0f7ff; }
.ec-cell.selected { outline: 2px solid var(--accent); outline-offset: -2px; background: #e8f0fe; }
.ec-cell.editing { padding: 0; }
.ec-formula-bar {
    display: flex; align-items: center; border-top: 1px solid var(--border-color);
    background: var(--bg-titlebar); padding: 4px 8px; flex-shrink: 0;
}
.ec-cell-ref { min-width: 80px; font-weight: bold; padding: 2px 8px; background: #fff; border: 1px solid #ccc; border-right: none; }
.ec-formula-input { flex: 1; border: 1px solid #ccc; padding: 4px 8px; font-size: 13px; }

/* ===== Video Player App ===== */
.vp-app {
    display: flex; flex-direction: column; height: 100%;
    background: #111; color: #eee; user-select: none;
}
.vp-screen {
    flex: 1; position: relative; background: #000;
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
}
.vp-video {
    max-width: 100%; max-height: 100%;
    width: 100%; height: 100%; object-fit: contain;
    display: block;
}
.vp-overlay {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; background: transparent;
}
.vp-big-play {
    display: flex; align-items: center; justify-content: center;
    width: 72px; height: 72px; border-radius: 50%;
    background: rgba(0,0,0,0.55); backdrop-filter: blur(6px);
    font-size: 28px; color: #fff; pointer-events: none;
    transition: opacity 0.15s; opacity: 0.85;
}
.vp-overlay:hover .vp-big-play { opacity: 1; transform: scale(1.08); }
.vp-loading {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    background: rgba(0,0,0,0.35);
}
.vp-spinner {
    width: 36px; height: 36px; border: 3px solid rgba(255,255,255,0.25);
    border-top-color: #fff; border-radius: 50%;
    animation: vp-spin 0.8s linear infinite;
}
@keyframes vp-spin { to { transform: rotate(360deg); } }

.vp-controls {
    flex-shrink: 0; padding: 8px 12px 10px;
    background: #1a1a1a; border-top: 1px solid #333;
}
.vp-progress-wrap {
    display: flex; align-items: center; gap: 8px; margin-bottom: 8px;
}
.vp-time-cur, .vp-time-tot {
    font-size: 12px; color: #aaa; min-width: 42px; font-variant-numeric: tabular-nums;
}
.vp-time-tot { text-align: right; }
.vp-progress-bar {
    flex: 1; height: 4px; background: #444; border-radius: 4px;
    position: relative; cursor: pointer; transition: height 0.1s;
}
.vp-progress-bar:hover { height: 6px; }
.vp-progress-buf {
    position: absolute; left: 0; top: 0; height: 100%;
    background: #555; border-radius: 4px; pointer-events: none;
}
.vp-progress-fill {
    position: absolute; left: 0; top: 0; height: 100%; width: 0;
    background: #4f9eff; border-radius: 4px; pointer-events: none;
    transition: width 0.1s linear;
}
.vp-progress-thumb {
    position: absolute; top: 50%; left: 0;
    width: 12px; height: 12px; border-radius: 50%;
    background: #fff; transform: translate(-50%, -50%);
    pointer-events: none; opacity: 0; transition: opacity 0.15s;
    box-shadow: 0 1px 4px rgba(0,0,0,0.5);
}
.vp-progress-bar:hover .vp-progress-thumb { opacity: 1; }

.vp-btns {
    display: flex; align-items: center; gap: 6px;
}
.vp-btn {
    background: transparent; border: none; color: #ccc;
    font-size: 16px; cursor: pointer; padding: 4px 6px; border-radius: 4px;
    line-height: 1; transition: color 0.15s, background 0.15s;
}
.vp-btn:hover { background: rgba(255,255,255,0.1); color: #fff; }
.vp-volume-wrap {
    display: flex; align-items: center; gap: 4px;
}
.vp-volume {
    -webkit-appearance: none; width: 70px; height: 4px;
    background: #555; border-radius: 4px; cursor: pointer; outline: none;
}
.vp-volume::-webkit-slider-thumb {
    -webkit-appearance: none; width: 12px; height: 12px;
    border-radius: 50%; background: #4f9eff; cursor: pointer;
}
.vp-filename {
    flex: 1; font-size: 12px; color: #888;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
    text-align: center; padding: 0 8px;
}
.vp-right-btns {
    display: flex; align-items: center; gap: 6px; margin-left: auto;
}
.vp-speed {
    background: #2a2a2a; color: #ccc; border: 1px solid #444;
    border-radius: 4px; padding: 3px 6px; font-size: 12px; cursor: pointer;
}
.vp-speed:focus { outline: none; border-color: #4f9eff; }

/* Fullscreen in vp-app */
.vp-app:fullscreen .vp-controls { position: absolute; bottom: 0; left: 0; right: 0; opacity: 0; transition: opacity 0.3s; }
.vp-app:fullscreen:hover .vp-controls { opacity: 1; }
.vp-app:-webkit-full-screen .vp-controls { position: absolute; bottom: 0; left: 0; right: 0; opacity: 0; transition: opacity 0.3s; }
.vp-app:-webkit-full-screen:hover .vp-controls { opacity: 1; }

/* ===== KairOS 助手 App ===== */
.ka-app {
    display: flex; flex-direction: column; height: 100%;
    background: var(--bg-window); position: relative;
}
.ka-messages {
    flex: 1; overflow-y: auto; padding: 16px;
    display: flex; flex-direction: column; gap: 12px;
}
.ka-welcome {
    display: flex; flex-direction: column; align-items: center;
    padding: 40px 20px; text-align: center;
}
.ka-welcome-icon { font-size: 48px; margin-bottom: 12px; }
.ka-welcome-title { font-size: 20px; font-weight: 600; color: var(--text-primary); margin-bottom: 8px; }
.ka-welcome-sub { font-size: 13px; color: var(--text-secondary); margin-bottom: 24px; max-width: 360px; }
.ka-welcome-hints { display: flex; flex-direction: column; gap: 8px; width: 100%; max-width: 380px; }
.ka-hint {
    padding: 10px 14px; background: var(--bg-hover); border-radius: 10px;
    font-size: 13px; color: var(--text-primary); cursor: pointer;
    text-align: left; transition: background 0.15s;
}
.ka-hint:hover { background: var(--bg-active); }

.ka-msg { display: flex; gap: 8px; align-items: flex-start; }
.ka-msg-user { flex-direction: row-reverse; }
.ka-msg-avatar {
    width: 30px; height: 30px; border-radius: 50%; background: var(--bg-hover);
    display: flex; align-items: center; justify-content: center;
    font-size: 16px; flex-shrink: 0;
}
.ka-msg-bubble { max-width: 75%; }
.ka-msg-content { white-space: pre-wrap; word-break: break-word; }
.ka-msg-ai .ka-msg-bubble {
    background: var(--bg-titlebar); border-radius: 4px 14px 14px 14px;
    padding: 10px 14px; font-size: 13px; line-height: 1.6; color: var(--text-primary);
}
.ka-msg-user .ka-msg-bubble {
    background: var(--accent); border-radius: 14px 4px 14px 14px;
    padding: 10px 14px; font-size: 13px; line-height: 1.6; color: #fff;
}

.ka-toolbar {
    display: flex; align-items: center; gap: 6px; padding: 6px 12px;
    border-top: 1px solid var(--border-color); background: var(--bg-titlebar);
    flex-shrink: 0;
}
.ka-model {
    flex: 1; padding: 4px 8px; border: 1px solid var(--border-color);
    border-radius: 6px; background: var(--bg-secondary);
    color: var(--text-primary); font-size: 12px; cursor: pointer;
}
.ka-btn-icon {
    background: transparent; border: none; color: var(--text-secondary);
    font-size: 16px; cursor: pointer; padding: 4px 8px; border-radius: 6px;
    transition: color 0.15s, background 0.15s;
}
.ka-btn-icon:hover { background: var(--bg-hover); color: var(--text-primary); }
.ka-btn-change {
    font-size: 13px; padding: 2px 6px; flex-shrink: 0;
    border-radius: 4px; color: var(--accent);
}
.ka-btn-change:hover { background: var(--bg-hover); opacity: 0.8; }

.ka-input-bar {
    display: flex; align-items: flex-end; gap: 8px; padding: 8px 12px 10px;
    border-top: 1px solid var(--border-color); flex-shrink: 0;
}
.ka-input {
    flex: 1; padding: 8px 12px; border: 1px solid var(--border-color);
    border-radius: 10px; background: var(--bg-secondary);
    color: var(--text-primary); font-size: 13px; font-family: inherit;
    resize: none; outline: none; line-height: 1.4; min-height: 22px; max-height: 120px;
}
.ka-input:focus { border-color: var(--accent); }
.ka-send {
    width: 36px; height: 36px; border: none; border-radius: 50%;
    background: var(--accent); color: #fff; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0; transition: opacity 0.15s;
}
.ka-send:hover { opacity: 0.85; }
.ka-send:disabled { opacity: 0.4; cursor: default; }

.ka-msg-ai .ka-msg-content p { margin-bottom: 8px; }
.ka-msg-ai .ka-msg-content p:last-child { margin-bottom: 0; }
.ka-msg-ai .ka-msg-content code {
    background: rgba(0,0,0,0.06); padding: 2px 5px; border-radius: 3px; font-size: 12px;
}
[data-theme="dark"] .ka-msg-ai .ka-msg-content code {
    background: rgba(255,255,255,0.1);
}
.ka-msg-ai .ka-msg-content pre {
    background: rgba(0,0,0,0.06); padding: 10px 14px; border-radius: 8px;
    overflow-x: auto; margin: 8px 0; font-size: 12px;
}
[data-theme="dark"] .ka-msg-ai .ka-msg-content pre {
    background: rgba(255,255,255,0.06);
}

/* === 自定义模型配置浮层 === */
.ka-custom-panel {
    position: absolute; bottom: 90px; left: 10px; right: 10px;
    background: var(--bg-window);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.18);
    z-index: 100;
    flex-direction: column;
    overflow: hidden;
}
.ka-custom-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 10px 14px;
    background: var(--bg-titlebar);
    border-bottom: 1px solid var(--border-color);
    font-size: 13px; font-weight: 600; color: var(--text-primary);
}
.ka-custom-close {
    background: transparent; border: none; cursor: pointer;
    color: var(--text-secondary); font-size: 14px; padding: 2px 6px;
    border-radius: 4px; line-height: 1;
}
.ka-custom-close:hover { background: var(--bg-hover); color: var(--text-primary); }
.ka-custom-body {
    padding: 14px;
    display: flex; flex-direction: column; gap: 8px;
}
.ka-custom-label {
    font-size: 12px; color: var(--text-secondary); font-weight: 500;
    display: flex; flex-direction: column; gap: 2px;
}
.ka-custom-hint {
    font-size: 11px; color: var(--text-secondary); font-weight: 400; opacity: 0.7;
}
.ka-custom-input {
    width: 100%; padding: 7px 10px;
    border: 1px solid var(--border-color); border-radius: 7px;
    background: var(--bg-secondary); color: var(--text-primary);
    font-size: 12px; font-family: 'SF Mono', monospace;
    outline: none; box-sizing: border-box;
    transition: border-color 0.15s;
}
.ka-custom-input:focus { border-color: var(--accent); }
.ka-custom-actions {
    display: flex; gap: 8px; margin-top: 4px;
}
.ka-custom-btn {
    flex: 1; padding: 7px 0; border: none; border-radius: 7px;
    font-size: 12px; cursor: pointer; transition: opacity 0.15s;
}
.ka-custom-btn:disabled { opacity: 0.5; cursor: default; }
.ka-custom-test {
    background: var(--bg-hover); color: var(--text-primary);
}
.ka-custom-test:hover:not(:disabled) { background: var(--bg-active); }
.ka-custom-save {
    background: var(--accent); color: #fff;
}
.ka-custom-save:hover:not(:disabled) { opacity: 0.85; }
.ka-custom-status {
    font-size: 12px; min-height: 16px; padding: 2px 0;
}
.ka-custom-status.ok    { color: #27ae60; }
.ka-custom-status.error { color: #e74c3c; }


/* ===== KairOS 助手 - 会话侧边栏 ===== */
.ka-app { display: flex; height: 100%; overflow: hidden; }
.ka-sidebar {
    width: 200px; min-width: 200px; background: #f8f9fa; border-right: 1px solid #e0e0e0;
    display: flex; flex-direction: column; transition: width 0.2s, min-width 0.2s; flex-shrink: 0;
}
.ka-sidebar.ka-collapsed { width: 0; min-width: 0; border-right: none; overflow: hidden; }
.ka-sidebar-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px 12px; font-size: 13px; font-weight: 600; color: #555;
    border-bottom: 1px solid #eee; background: #f0f0f0;
}
.ka-sidebar-list { flex: 1; overflow-y: auto; padding: 6px; }
.ka-sidebar-loading, .ka-sidebar-empty { padding: 20px 12px; text-align: center; color: #999; font-size: 13px; }
.ka-sidebar-item {
    padding: 8px 10px; border-radius: 8px; cursor: pointer; margin-bottom: 3px;
    position: relative; transition: background 0.15s;
}
.ka-sidebar-item:hover { background: #e8e8e8; }
.ka-sidebar-item.active { background: #e0e7ff; }
.ka-sidebar-item-title { font-size: 13px; color: #333; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ka-sidebar-item-time { font-size: 11px; color: #aaa; margin-top: 2px; }
.ka-sidebar-item-del {
    position: absolute; right: 6px; top: 6px; width: 22px; height: 22px; border-radius: 50%;
    border: none; background: transparent; cursor: pointer; font-size: 12px; color: #ccc; display: none;
}
.ka-sidebar-item:hover .ka-sidebar-item-del { display: block; }
.ka-sidebar-item-del:hover { background: #fee; color: #c33; }
#ka-sidebar-toggle { border:none; background:transparent; cursor:pointer; font-size:12px; padding:2px 6px; border-radius:4px; }
#ka-sidebar-toggle:hover { background:#ddd; }

.ka-main-area { flex: 1; display: flex; flex-direction: column; min-width: 0; overflow: hidden; }
.ka-main-area .ka-messages { flex: 1; overflow-y: auto; }
.ka-main-area .ka-toolbar { flex-shrink: 0; }
.ka-main-area .ka-input-bar { flex-shrink: 0; }

/* ===== Upload Progress Dialog ===== */
.upload-progress-overlay {
    position:fixed; top:0; left:0; right:0; bottom:0; z-index:9999;
    background:rgba(0,0,0,0.45);
    display:flex; align-items:center; justify-content:center;
}
.upload-progress-dialog {
    background:#fff; border-radius:12px; padding:28px 32px;
    min-width:320px; max-width:420px;
    box-shadow:0 8px 32px rgba(0,0,0,0.18);
    text-align:center;
}
.upload-progress-title {
    font-size:17px; font-weight:600; color:#333; margin-bottom:6px;
}
.upload-progress-name {
    font-size:12px; color:#999; margin-bottom:16px;
    white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
}
.upload-progress-stage {
    font-size:13px; color:#666; margin-bottom:10px;
}
.progress-bar-track {
    width:100%; height:8px; background:#eee; border-radius:4px;
    overflow:hidden;
}
.progress-bar-fill {
    width:0%; height:100%; background:#4a90d9;
    border-radius:4px; transition: width 0.3s ease;
}
.upload-progress-detail {
    font-size:12px; color:#999; margin-top:6px;
}