/*
 * 全应用液态玻璃材质。布局仍由 style.css 管理。
 * 视觉参考：https://gitee.com/greyd097/yzrt/tree/master/纯CSS液态玻璃
 * 使用透明渐变、双向内高光和背景模糊模拟折射，装饰不覆盖交互内容。
 */
body.liquid-glass {
    color-scheme: light;
    --surface: rgba(255, 255, 255, .38);
    --surface-hover: rgba(255, 255, 255, .66);
    --text-primary: #182439;
    --text-secondary: #42516b;
    --text-tertiary: #596a82;
    --border: rgba(108, 132, 168, .22);
    --border-strong: rgba(96, 123, 161, .32);
    --glass-shell: rgba(255, 255, 255, .30);
    --glass-panel: rgba(255, 255, 255, .38);
    --glass-card: rgba(255, 255, 255, .46);
    --glass-control: rgba(255, 255, 255, .54);
    --glass-reading: rgba(255, 255, 255, .76);
    --glass-dialog: rgba(248, 251, 255, .91);
    --glass-edge: rgba(255, 255, 255, .78);
    --glass-rim: rgba(255, 255, 255, .94);
    --glass-rim-soft: rgba(255, 255, 255, .48);
    --glass-depth: rgba(31, 53, 91, .13);
    --glass-sheen: linear-gradient(125deg, rgba(255, 255, 255, .42), transparent 33%, transparent 72%, rgba(255, 255, 255, .18));
    --glass-shadow: inset 1px 1px 0 var(--glass-rim), inset -1px -1px 0 var(--glass-rim-soft), inset 0 0 0 1px rgba(255, 255, 255, .14), 0 14px 40px var(--glass-depth);
    --glass-card-shadow: inset 1px 1px 0 var(--glass-rim), inset -1px -1px 0 var(--glass-rim-soft), 0 5px 18px rgba(31, 53, 91, .06);
    --glass-control-shadow: inset 1px 1px 1px var(--glass-rim), inset -1px -1px 1px var(--glass-rim-soft), inset 0 0 0 1px rgba(255, 255, 255, .10), 0 3px 9px rgba(31, 53, 91, .07);
    --glass-blur: 24px;
    --glass-saturation: 150%;
    background-color: #e9edf8;
}

body.liquid-glass.theme-dark {
    color-scheme: dark;
    --surface: rgba(22, 31, 49, .46);
    --surface-hover: rgba(65, 83, 115, .52);
    --text-primary: #f2f5fc;
    --text-secondary: #c4d0e3;
    --text-tertiary: #a4b4ce;
    --border: rgba(180, 202, 234, .18);
    --border-strong: rgba(196, 215, 244, .30);
    --glass-shell: rgba(17, 26, 45, .46);
    --glass-panel: rgba(24, 36, 58, .44);
    --glass-card: rgba(37, 52, 77, .48);
    --glass-control: rgba(52, 68, 94, .54);
    --glass-reading: rgba(27, 40, 62, .84);
    --glass-dialog: rgba(21, 32, 51, .94);
    --glass-edge: rgba(187, 211, 247, .23);
    --glass-rim: rgba(224, 238, 255, .36);
    --glass-rim-soft: rgba(176, 206, 249, .12);
    --glass-depth: rgba(0, 5, 18, .30);
    --glass-sheen: linear-gradient(125deg, rgba(204, 225, 255, .11), transparent 35%, transparent 72%, rgba(161, 197, 255, .05));
    --glass-card-shadow: inset 1px 1px 0 var(--glass-rim), inset -1px -1px 0 var(--glass-rim-soft), 0 5px 18px rgba(0, 5, 18, .12);
    --glass-control-shadow: inset 1px 1px 1px var(--glass-rim), inset -1px -1px 1px var(--glass-rim-soft), 0 3px 10px rgba(0, 5, 18, .18);
    background-color: #101a2e;
}

/* 大面积柔光背景让半透明边缘有清晰的折射参照。 */
body.liquid-glass::before {
    background:
        radial-gradient(ellipse at 8% 12%, color-mix(in srgb, var(--primary-color) 25%, transparent), transparent 46%),
        radial-gradient(ellipse at 94% 24%, color-mix(in srgb, var(--accent) 26%, transparent), transparent 44%),
        radial-gradient(ellipse at 62% 94%, color-mix(in srgb, var(--secondary-color) 16%, transparent), transparent 48%);
    background-size: auto;
    mask-image: none;
    -webkit-mask-image: none;
}

body.liquid-glass::after {
    inset: 0;
    width: auto;
    height: auto;
    border: 0;
    border-radius: 0;
    background:
        radial-gradient(ellipse 90vw 65vh at 95% 110%, transparent 60%, rgba(255, 255, 255, .17) 61%, transparent 64%),
        radial-gradient(ellipse 75vw 100vh at -12% 0%, transparent 64%, rgba(255, 255, 255, .20) 65%, transparent 68%);
    box-shadow: none;
}

body.liquid-glass.theme-dark::after {
    opacity: .23;
}

body.liquid-glass:not(.chat-active) .container {
    border-color: transparent;
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}

/* 仅主要容器采样背景；长消息列表和重复卡片使用静态高光，减少滚动开销。 */
body.liquid-glass :is(.login-section, .workspace-header, .section, .admin-panel-inner) {
    border-color: var(--glass-edge);
    background: var(--glass-sheen), var(--glass-shell);
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
}

body.liquid-glass .workspace-header {
    border-radius: 24px;
}

body.liquid-glass .login-section {
    border: 1px solid var(--glass-edge);
    border-radius: 30px;
}

body.liquid-glass :is(.login-form-card, .settings-card, .admin-operation-card,
    .admin-toggle-card, .stat-card, .health-metric-card, .file-item, .upload-task,
    .security-item, .chat-left-panel, .login-feature) {
    border-color: var(--glass-edge);
    background: var(--glass-sheen), var(--glass-card);
    box-shadow: var(--glass-card-shadow);
}

body.liquid-glass .settings-section .color-picker-panel {
    border-color: var(--glass-edge);
    background: var(--glass-sheen), var(--glass-card);
    box-shadow: var(--glass-card-shadow);
}

body.liquid-glass .chat-right-panel {
    background: transparent;
}

/* 私信只在共同外壳采样背景，左右内容区不再各叠一层不同的实心底色。 */
body.liquid-glass #privateSection .private-shell {
    border-color: var(--border-strong);
    background: var(--glass-sheen), var(--glass-panel);
    box-shadow: var(--glass-card-shadow);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
}

body.liquid-glass #privateSection :is(.private-sidebar, .private-chat, .private-active, .private-messages) {
    border-color: var(--border-strong);
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}

body.liquid-glass #privateSection :is(.private-sidebar-head, .private-recipient-search,
    .private-chat-head, .private-composer, .private-compose-context) {
    border-color: var(--border-strong);
    background: var(--glass-sheen), var(--glass-panel);
    box-shadow: inset 0 1px 0 var(--glass-rim-soft);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}

body.liquid-glass #privateSection .private-recipient-search { border-bottom: 1px solid var(--border); }

body.liquid-glass #privateSection :is(.private-recipient-search input, #privateMessageInput) {
    min-height: 44px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--glass-sheen), var(--glass-control);
    box-shadow: var(--glass-control-shadow);
    color: var(--text-primary);
}

body.liquid-glass #privateSection :is(.private-recipient-search input, #privateMessageInput):focus {
    border-color: var(--primary-color);
    box-shadow: var(--glass-control-shadow), 0 0 0 3px color-mix(in srgb, var(--primary-color) 14%, transparent);
}

body.liquid-glass #privateSection :is(#privateRecipientLookupBtn, #privateSendButton) {
    min-height: 44px;
    border: 1px solid var(--glass-edge);
    border-radius: 12px;
    background-color: var(--primary-color);
    background-image: linear-gradient(135deg, rgba(255, 255, 255, .23), transparent 52%, rgba(255, 255, 255, .06));
    box-shadow: inset 1px 1px 0 rgba(255, 255, 255, .46), inset -1px -1px 0 rgba(255, 255, 255, .17), 0 5px 14px color-mix(in srgb, var(--primary-color) 14%, transparent);
    color: #fff;
}

body.liquid-glass.theme-dark #privateSection :is(#privateRecipientLookupBtn, #privateSendButton) { color: #072c2b; }

body.liquid-glass #privateSection :is(.private-tool-button, .private-new-toggle, .private-mobile-back,
    .private-load-conversations, .private-load-history, .private-list-state button,
    .private-compose-context button, .private-attachment-draft > button) {
    min-width: 44px;
    min-height: 44px;
    border: 1px solid var(--glass-edge);
    border-radius: 12px;
    background: var(--glass-sheen), var(--glass-control);
    box-shadow: var(--glass-control-shadow);
    color: var(--text-primary);
}

body.liquid-glass #privateSection :is(.private-tool-button, .private-new-toggle, .private-mobile-back,
    .private-load-conversations, .private-load-history, .private-list-state button):is(:hover, [aria-expanded="true"]) {
    border-color: var(--border-strong);
    background: var(--glass-sheen), var(--surface-hover);
    color: var(--primary-color);
}

body.liquid-glass #privateSection .private-conversation-item { border-color: transparent; background: transparent; }
body.liquid-glass #privateSection .private-conversation-item:hover { background: var(--glass-sheen), var(--glass-control); }
body.liquid-glass #privateSection .private-conversation-item.active {
    border-color: var(--glass-edge);
    background: var(--glass-sheen), color-mix(in srgb, var(--primary-color) 8%, var(--glass-control));
    box-shadow: var(--glass-control-shadow);
}

body.liquid-glass #privateSection :is(.private-attachment-draft, .private-attachment-file,
    .private-attachment-media, .private-reply-quote) {
    border-color: var(--border);
    background: var(--glass-sheen), var(--glass-card);
    box-shadow: var(--glass-card-shadow);
}
body.liquid-glass #privateSection .private-attachment-draft.is-ready { border-color: color-mix(in srgb, #16a34a 42%, var(--border)); }
body.liquid-glass #privateSection .private-attachment-draft.is-failed { border-color: color-mix(in srgb, #ef4444 44%, var(--border)); }
body.liquid-glass #privateSection .private-reply-quote { border-left-color: var(--primary-color); }

body.liquid-glass #privateSection :is(.private-empty > span, .private-chat-placeholder > span,
    .private-attachment-file > span:first-child) {
    border: 1px solid var(--glass-edge);
    background: var(--glass-sheen), var(--glass-control);
    box-shadow: var(--glass-control-shadow);
    color: var(--primary-color);
}
body.liquid-glass #privateSection .private-emoji-panel {
    border-color: var(--glass-edge);
    background: var(--glass-sheen), var(--glass-dialog);
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
}
body.liquid-glass #privateSection .private-guest-warning {
    border-color: color-mix(in srgb, #d97706 32%, var(--glass-edge));
    background: var(--glass-sheen), color-mix(in srgb, #d97706 8%, var(--glass-card));
    box-shadow: var(--glass-card-shadow);
}
body.liquid-glass #privateSection .private-guest-warning strong { color: #a85e08; }
body.liquid-glass.theme-dark #privateSection .private-guest-warning strong { color: #fcd690; }

body.liquid-glass :is(.messages, .file-list) {
    border-color: var(--border);
    background: rgba(255, 255, 255, .12);
    box-shadow: inset 0 1px 6px rgba(39, 62, 100, .025);
}

body.liquid-glass.theme-dark :is(.messages, .file-list) {
    background: rgba(8, 17, 33, .12);
}

body.liquid-glass :is(.message, .private-message-bubble, .settings-preview-bubble) {
    border-color: var(--border);
    background: var(--glass-reading);
    box-shadow: inset 0 1px 0 var(--glass-rim-soft), 0 3px 10px rgba(31, 53, 91, .04);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}

body.liquid-glass :is(.message.own, .private-message-bubble.own, .settings-preview-bubble.is-own) {
    border-color: color-mix(in srgb, var(--primary-color) 36%, var(--border));
    background: color-mix(in srgb, var(--primary-color) 10%, var(--glass-reading));
    box-shadow: inset 0 1px 0 var(--glass-rim), 0 3px 10px rgba(31, 53, 91, .04);
}

body.liquid-glass .message.system {
    border-color: transparent;
    background: transparent;
    box-shadow: none;
    color: var(--text-secondary);
}

body.liquid-glass .username.is-admin { color: #b5273e; }
body.liquid-glass.theme-dark .username.is-admin { color: #ffb9c5; }
body.liquid-glass .file-action-btn.share { color: #6d28d9; }
body.liquid-glass.theme-dark .file-action-btn.share { color: #d5beff; }

body.liquid-glass :is(.input-section,
    .file-batch-toolbar, .upload-task-center, .file-search-box, .settings-preview-compose) {
    border-color: var(--glass-edge);
    background: var(--glass-sheen), var(--glass-panel);
    box-shadow: var(--glass-card-shadow);
}

/* 胶囊导航与透亮的选中态。 */
body.liquid-glass .workspace-nav {
    border-color: var(--glass-edge);
    border-radius: 999px;
    background: var(--glass-sheen), var(--glass-panel);
    box-shadow: inset 1px 1px 2px var(--glass-rim-soft), inset -1px -1px 2px rgba(62, 86, 123, .04);
}

body.liquid-glass .workspace-nav-item {
    border-radius: 999px;
}

body.liquid-glass :is(.workspace-nav-item.active, .chat-nav-item.active,
    .admin-nav-item.active, .file-tool-button.active) {
    color: var(--primary-color);
    border-color: var(--glass-edge);
    background: var(--glass-sheen), color-mix(in srgb, var(--primary-color) 8%, var(--glass-control));
    box-shadow: var(--glass-control-shadow);
}

body.liquid-glass .workspace-header .user-info {
    border-color: var(--glass-edge);
    border-radius: 999px;
    background: var(--glass-sheen), var(--glass-control);
    box-shadow: var(--glass-control-shadow);
}

body.liquid-glass :is(.theme-mode-toggle, .notification-settings-btn, .workspace-logout,
    .file-action-btn, .file-tool-button, .pagination-btn) {
    border-color: var(--glass-edge);
    background: var(--glass-sheen), var(--glass-control);
    box-shadow: var(--glass-control-shadow);
}

body.liquid-glass :is(.theme-mode-toggle, .notification-settings-btn, .workspace-logout) {
    border-radius: 16px;
}
body.liquid-glass .workspace-logout { flex-shrink: 0; white-space: nowrap; }

body.liquid-glass :is(.workspace-brand-mark, .brand-mark, .user-avatar) {
    box-shadow: inset 1px 1px 0 rgba(255, 255, 255, .62), inset -1px -1px 0 rgba(255, 255, 255, .26), 0 6px 14px color-mix(in srgb, var(--primary-color) 18%, transparent);
}

body.liquid-glass .btn,
body.liquid-glass #privateSendButton {
    background-color: var(--primary-color);
    background-image: linear-gradient(135deg, rgba(255, 255, 255, .23), transparent 52%, rgba(255, 255, 255, .06));
    box-shadow: inset 1px 1px 0 rgba(255, 255, 255, .46), inset -1px -1px 0 rgba(255, 255, 255, .17), 0 5px 14px color-mix(in srgb, var(--primary-color) 14%, transparent);
}

body.liquid-glass.theme-dark .btn:not(.btn-success):not(.btn-warning):not(.btn-secondary):not(.btn-register):not(.btn-danger),
body.liquid-glass.theme-dark #privateSendButton {
    color: #072c2b;
}

body.liquid-glass .btn-success {
    background-color: #12845d;
    color: #fff;
}

body.liquid-glass .btn-warning {
    background-color: #a85e08;
    color: #fff;
}

body.liquid-glass :is(.btn-secondary, .btn-register),
body.liquid-glass .login-form-card .login-buttons .btn-register {
    border-color: var(--glass-edge);
    background: var(--glass-sheen), var(--glass-control);
    color: var(--text-primary);
    box-shadow: var(--glass-control-shadow);
}

body.liquid-glass :is(.btn-danger, .file-action-btn.danger, .workspace-logout) {
    color: #b5273e;
    border-color: rgba(215, 68, 92, .25);
    background: var(--glass-sheen), rgba(249, 141, 158, .13);
    box-shadow: var(--glass-control-shadow);
}

body.liquid-glass.theme-dark :is(.btn-danger, .file-action-btn.danger, .workspace-logout) {
    color: #ffb9c5;
    background-color: rgba(225, 87, 113, .14);
}

body.liquid-glass :is(.admin-danger-zone, .admin-danger-card) {
    border-color: rgba(215, 68, 92, .25);
    background: var(--glass-sheen), rgba(249, 141, 158, .08);
}

/* 输入内容维持清晰底色，聚焦时明确描边。 */
body.liquid-glass :is(input:not([type="checkbox"]):not([type="radio"]):not([type="range"]):not([type="color"]),
    textarea, select) {
    border-color: var(--border-strong);
    background-color: var(--glass-reading);
    color: var(--text-primary);
    box-shadow: inset 0 1px 3px rgba(31, 53, 91, .035), 0 1px 0 var(--glass-rim-soft);
}

body.liquid-glass :is(input, textarea)::placeholder {
    color: var(--text-tertiary);
    opacity: 1;
}

body.liquid-glass .input-section #messageInput {
    border-color: transparent;
    background: transparent;
    box-shadow: none;
}

body.liquid-glass :is(button, input, select, textarea, a):focus-visible {
    outline: 3px solid color-mix(in srgb, var(--primary-color) 50%, transparent);
    outline-offset: 3px;
}

body.liquid-glass :is(.upload-area, .settings-theme-preview, .file-visual) {
    border-color: var(--glass-edge);
    background: var(--glass-sheen), color-mix(in srgb, var(--primary-color) 7%, var(--glass-card));
}

body.liquid-glass .file-item {
    border-radius: 20px;
}

body.liquid-glass .file-view-grid .file-actions {
    border-color: var(--glass-edge);
    background: var(--glass-control);
}

body.liquid-glass :is(.modal, .file-details-layer) {
    background-color: rgba(23, 37, 64, .28);
    backdrop-filter: blur(7px);
    -webkit-backdrop-filter: blur(7px);
}

body.liquid-glass :is(.modal-content, .file-details-drawer, .global-search-panel,
    .emoji-picker-panel, .private-emoji-panel,
    .export-menu, .mention-dropdown, .jump-to-latest, .toast) {
    border-color: var(--glass-edge);
    background: var(--glass-sheen), var(--glass-dialog);
    color: var(--text-primary);
    box-shadow: var(--glass-shadow);
}

body.liquid-glass :is(.modal-content, .file-details-drawer, .global-search-panel) {
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
}

/* 消息操作使用独立的小玻璃浮层，避免为每个消息气泡增加模糊开销。 */
body.liquid-glass :is(.message .actions, .private-message-actions) {
    z-index: 5;
    max-width: calc(100% - 16px);
    box-sizing: border-box;
    flex-wrap: wrap;
    align-items: center;
    gap: 3px;
    padding: 4px;
    border: 1px solid var(--glass-edge);
    border-radius: 15px;
    background: var(--glass-sheen), var(--glass-control);
    box-shadow: var(--glass-control-shadow), 0 8px 24px var(--glass-depth);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
}

body.liquid-glass .message .actions {
    top: -12px;
    width: max-content;
    max-width: min(320px, calc(100vw - 56px));
}

body.liquid-glass .message:not(.own) .actions {
    right: auto;
    left: 8px;
}

body.liquid-glass :is(.message .action-btn, .private-message-actions button) {
    display: inline-flex;
    min-height: 32px;
    align-items: center;
    justify-content: center;
    padding: 5px 10px;
    border: 1px solid transparent;
    border-radius: 11px;
    background: transparent;
    color: var(--text-primary);
    font: inherit;
    font-size: 11px;
    font-weight: 600;
    line-height: 1.25;
    white-space: nowrap;
    box-shadow: none;
    transition: background-color .15s ease, border-color .15s ease, box-shadow .15s ease;
}

body.liquid-glass :is(.message .action-btn, .private-message-actions button):is(:hover, :focus-visible) {
    border-color: var(--glass-edge);
    background: var(--glass-sheen), color-mix(in srgb, var(--primary-color) 12%, var(--glass-control));
    color: var(--text-primary);
    box-shadow: var(--glass-control-shadow);
}

body.liquid-glass :is(.message .action-btn, .private-message-actions button):focus-visible,
body.liquid-glass .message-actions-toggle:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

body.liquid-glass :is(.message .action-btn, .private-message-actions button):active {
    box-shadow: inset 0 2px 4px var(--glass-depth);
}

body.liquid-glass :is(.message .action-btn.delete, .message .action-btn.recall, .private-message-actions .recall) {
    color: #b5273e;
}

body.liquid-glass.theme-dark :is(.message .action-btn.delete, .message .action-btn.recall, .private-message-actions .recall) {
    color: #ffb9c5;
}

body.liquid-glass :is(.message .action-btn.delete, .message .action-btn.recall, .private-message-actions .recall):is(:hover, :focus-visible) {
    border-color: rgba(215, 68, 92, .30);
    background: var(--glass-sheen), rgba(225, 87, 113, .16);
}

body.liquid-glass .message-actions-toggle {
    border: 1px solid var(--glass-edge);
    border-radius: 10px;
    background: var(--glass-sheen), var(--glass-control);
    color: var(--text-primary);
    box-shadow: var(--glass-control-shadow);
}

@media (max-width: 600px) {
    body.liquid-glass :is(.message .action-btn, .private-message-actions button, .message-actions-toggle) {
        min-width: 44px;
        min-height: 44px;
    }
    body.liquid-glass .message .header {
        min-height: 40px;
        padding-right: 44px;
    }
    body.liquid-glass .message .actions {
        width: auto;
        max-width: 100%;
        border-radius: 13px;
    }
    body.liquid-glass .private-message-actions { max-width: 100%; }
}

@media (hover: none), (pointer: coarse) {
    body.liquid-glass :is(.message .action-btn, .private-message-actions button, .message-actions-toggle) {
        min-width: 44px;
        min-height: 44px;
    }
}

/* 状态提示使用真正的背景采样与玻璃边缘，不再显示为实心色块。 */
body.liquid-glass .toast {
    --toast-accent: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 50px;
    max-width: min(440px, calc(100vw - 28px));
    padding: 10px 15px 10px 10px;
    border: 1px solid var(--glass-edge);
    border-radius: 20px;
    background: var(--glass-sheen), var(--glass-control);
    color: var(--text-primary);
    box-shadow: var(--glass-shadow);
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    font-size: 13px;
    line-height: 1.5;
}
body.liquid-glass .toast.success { --toast-accent: #087c53; }
body.liquid-glass .toast.error { --toast-accent: #b5273e; }
body.liquid-glass .toast.warning { --toast-accent: #a85e08; }
body.liquid-glass.theme-dark .toast.success { --toast-accent: #6ee7b7; }
body.liquid-glass.theme-dark .toast.error { --toast-accent: #ffb9c5; }
body.liquid-glass.theme-dark .toast.warning { --toast-accent: #fcd690; }
body.liquid-glass .toast-icon {
    display: grid;
    width: 29px;
    height: 29px;
    flex: 0 0 29px;
    place-items: center;
    border: 1px solid var(--glass-edge);
    border-radius: 999px;
    background: var(--glass-sheen), color-mix(in srgb, var(--toast-accent) 12%, var(--glass-control));
    color: var(--toast-accent);
    box-shadow: var(--glass-control-shadow);
    font-size: 16px;
    font-weight: 800;
}
body.liquid-glass .toast-message { min-width: 0; overflow-wrap: anywhere; }

@media (hover: hover) and (pointer: fine) {
    body.liquid-glass :is(.theme-mode-toggle, .notification-settings-btn, .file-action-btn,
        .file-tool-button, .pagination-btn, .private-new-toggle):hover {
        background: var(--glass-sheen), var(--surface-hover);
        border-color: var(--border-strong);
    }

    body.liquid-glass .file-item:hover {
        box-shadow: var(--glass-shadow);
    }
}

/* 手机减少大面积模糊采样，保持触控、软键盘和小窗口的原有布局。 */
@media (max-width: 600px) {
    body.liquid-glass { --glass-blur: 14px; }
    body.liquid-glass .workspace-header { border-radius: 20px; }
    body.liquid-glass .login-section { border-radius: 22px; }
    body.liquid-glass :is(.theme-mode-toggle, .notification-settings-btn, .workspace-logout) { border-radius: 14px; }
    body.liquid-glass .settings-section .color-picker-panel { border-radius: 16px; }
}

/* 不支持背景模糊、减少透明度或高对比设置时提高底色覆盖率。 */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
    body.liquid-glass {
        --glass-shell: var(--surface-solid);
        --glass-panel: var(--surface-solid);
        --glass-card: var(--surface-solid);
        --glass-control: var(--surface-solid);
        --glass-reading: var(--surface-solid);
        --glass-dialog: var(--surface-solid);
    }
}

@media (prefers-reduced-transparency: reduce) {
    body.liquid-glass {
        --glass-shell: var(--surface-solid);
        --glass-panel: var(--surface-solid);
        --glass-card: var(--surface-solid);
        --glass-control: var(--surface-solid);
        --glass-reading: var(--surface-solid);
        --glass-dialog: var(--surface-solid);
        --glass-sheen: linear-gradient(transparent, transparent);
        --glass-blur: 0px;
    }
}

@media (prefers-contrast: more) {
    body.liquid-glass {
        --glass-shell: var(--surface-solid);
        --glass-panel: var(--surface-solid);
        --glass-card: var(--surface-solid);
        --glass-control: var(--surface-solid);
        --glass-reading: var(--surface-solid);
        --glass-dialog: var(--surface-solid);
        --glass-edge: var(--text-secondary);
    }
}

/* 点击切换的玻璃导航滑块，保留过渡动画；窄屏可自然水平滚动。 */
body.liquid-glass .workspace-nav {
    position: relative;
    isolation: isolate;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
    user-select: none;
}
body.liquid-glass .workspace-nav::-webkit-scrollbar { display: none; }
body.liquid-glass .workspace-nav-indicator {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 0;
    pointer-events: none;
    border: 1px solid var(--glass-edge);
    border-radius: 999px;
    background: var(--glass-sheen), color-mix(in srgb, var(--primary-color) 10%, var(--glass-control));
    box-shadow: var(--glass-control-shadow);
    transition: transform .22s ease, width .22s ease, height .22s ease;
}
body.liquid-glass .workspace-nav .workspace-nav-item {
    position: relative;
    z-index: 1;
    flex-shrink: 0;
    cursor: pointer;
}
body.liquid-glass .workspace-nav .workspace-nav-item.active {
    border-color: transparent;
    background: transparent;
    box-shadow: none;
    color: var(--primary-color);
}

body.liquid-glass .file-space-toolbar {
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
    min-width: 0;
}
body.liquid-glass .file-space-switch {
    display: flex;
    flex-shrink: 0;
    gap: 4px;
    padding: 4px;
    border: 1px solid var(--glass-edge);
    border-radius: 16px;
    background: var(--glass-sheen), var(--glass-panel);
    box-shadow: var(--glass-card-shadow);
}
body.liquid-glass .file-space-switch button {
    min-height: 44px;
    padding: 8px 18px;
    border: 1px solid transparent;
    border-radius: 12px;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 650;
    cursor: pointer;
    white-space: nowrap;
}
body.liquid-glass .file-space-switch button[aria-selected="true"] {
    color: var(--primary-color);
    border-color: var(--glass-edge);
    background: var(--glass-sheen), var(--glass-control);
    box-shadow: var(--glass-control-shadow);
}
body.liquid-glass .file-space-switch button:disabled { opacity: .5; cursor: not-allowed; }
body.liquid-glass .file-space-summary {
    display: flex;
    min-width: 0;
    flex-direction: column;
    align-items: flex-end;
    gap: 6px;
    color: var(--text-secondary);
    font-size: 12px;
    overflow-wrap: anywhere;
}
body.liquid-glass #personalDriveUsage {
    width: min(220px, 100%);
    height: 6px;
    accent-color: var(--primary-color);
}
/* 增加空间切换栏后，文件区随内容增长，避免小窗口把卡片挤扁。 */
body.liquid-glass.chat-active #fileSection.workspace-panel.is-active { height: auto; }
body.liquid-glass #fileSection .file-list { min-height: 260px; scrollbar-gutter: stable; }
body.liquid-glass .file-batch-actions[hidden] { display: none; }
@media (max-width: 600px) {
    body.liquid-glass .file-space-toolbar { flex-wrap: wrap; gap: 8px; }
    body.liquid-glass .file-space-switch { width: 100%; }
    body.liquid-glass .file-space-switch button { flex: 1; padding-inline: 10px; }
    body.liquid-glass .file-space-summary { width: 100%; align-items: stretch; font-size: 11px; }
    body.liquid-glass #personalDriveUsage { width: 100%; }
}

/* 与工作区导航一致的三段玻璃胶囊，保持图标与现有主题状态。 */
body.liquid-glass .theme-mode-switch {
    --theme-mode-index: 2;
    position: relative;
    display: inline-grid;
    grid-template-columns: repeat(3, 32px);
    align-items: center;
    justify-content: center;
    gap: 4px;
    flex: 0 0 114px;
    width: 114px;
    height: 44px;
    padding: 4px;
    border: 1px solid var(--glass-edge);
    border-radius: 999px;
    background: var(--glass-sheen), var(--glass-panel);
    box-shadow: inset 1px 1px 2px var(--glass-rim-soft), inset -1px -1px 2px rgba(62, 86, 123, .04);
    cursor: default;
    isolation: isolate;
}
body.liquid-glass .workspace-theme-slot { width: 114px; height: 44px; flex: 0 0 114px; }
body.liquid-glass .global-theme-slot > .theme-mode-switch {
    position: fixed;
    z-index: 100;
    top: max(12px, env(safe-area-inset-top));
    right: max(14px, env(safe-area-inset-right));
}
body.liquid-glass .theme-mode-indicator {
    position: absolute;
    top: 5px;
    left: 5px;
    width: 32px;
    height: 32px;
    border: 1px solid var(--glass-edge);
    border-radius: 999px;
    background: var(--glass-sheen), color-mix(in srgb, var(--primary-color) 10%, var(--glass-control));
    box-shadow: var(--glass-control-shadow);
    pointer-events: none;
    transform: translateX(calc(var(--theme-mode-index) * 36px));
    transition: transform .22s ease, width .22s ease, height .22s ease;
}
body.liquid-glass .theme-mode-option {
    position: relative;
    z-index: 1;
    display: grid;
    width: 32px;
    height: 32px;
    padding: 0;
    place-items: center;
    border: 0;
    border-radius: 999px;
    background: transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: var(--transition);
}
body.liquid-glass .theme-mode-option:hover { color: var(--text-primary); }
body.liquid-glass .theme-mode-option:not([aria-pressed="true"]):hover { background: var(--surface-hover); }
body.liquid-glass .theme-mode-option[aria-pressed="true"] { color: var(--primary-color); }
body.liquid-glass .theme-mode-option svg {
    display: block;
    width: 17px;
    height: 17px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}
body.liquid-glass .theme-mode-option:focus-visible { outline: 2px solid var(--primary-color); outline-offset: 3px; }
@media (max-width: 600px) {
    body.liquid-glass .workspace-brand { gap: 6px; }
    body.liquid-glass .workspace-brand-mark { width: 32px; height: 32px; }
    body.liquid-glass #connectionStatusText {
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        overflow: hidden;
        white-space: nowrap;
        clip-path: inset(50%);
    }
    body.liquid-glass .workspace-header .user-info { gap: 2px; padding: 4px; max-width: 60px; }
    body.liquid-glass .workspace-header .user-avatar { width: 28px; height: 28px; }
    body.liquid-glass .workspace-header .user-status-control { width: 18px; min-width: 18px; padding: 0; justify-content: center; }
}
@media (max-width: 360px) {
    body.liquid-glass .workspace-header { column-gap: 4px; }
    body.liquid-glass .workspace-brand-mark { width: 28px; height: 28px; }
    body.liquid-glass .workspace-header .user-avatar { display: none; }
}

/* 控制台沿用顶栏的横向胶囊导航和玻璃选中滑块，窄屏仅滚动、不拖选。 */
body.liquid-glass .admin-workspace {
    display: flex;
    min-width: 0;
    flex-direction: column;
}
body.liquid-glass .admin-sidebar {
    position: static;
    display: block;
    width: 100%;
    min-width: 0;
    padding: 0;
    border: 0;
    background: transparent;
}
body.liquid-glass .admin-sidebar-label { padding: 0 8px 8px; color: var(--text-secondary); }
body.liquid-glass .admin-navigation {
    position: relative;
    isolation: isolate;
    display: flex;
    width: 100%;
    max-width: 100%;
    align-items: center;
    gap: 5px;
    padding: 5px;
    overflow-x: auto;
    overflow-y: hidden;
    border: 1px solid var(--glass-edge);
    border-radius: 999px;
    background: var(--glass-sheen), var(--glass-panel);
    box-shadow: inset 1px 1px 2px var(--glass-rim-soft), inset -1px -1px 2px rgba(62, 86, 123, .04);
    scrollbar-width: none;
}
body.liquid-glass .admin-navigation::-webkit-scrollbar { display: none; }
body.liquid-glass .admin-nav-indicator {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 0;
    pointer-events: none;
    border: 1px solid var(--glass-edge);
    border-radius: 999px;
    background: var(--glass-sheen), color-mix(in srgb, var(--primary-color) 10%, var(--glass-control));
    box-shadow: var(--glass-control-shadow);
    transition: transform .22s ease, width .22s ease, height .22s ease;
}
body.liquid-glass .admin-navigation .admin-nav-item {
    position: relative;
    z-index: 1;
    display: inline-flex;
    flex: 1 0 124px;
    width: auto;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    gap: 7px;
    margin: 0;
    padding: 7px 12px;
    border: 0;
    border-radius: 999px;
    background: transparent;
    box-shadow: none;
    color: var(--text-secondary);
    white-space: nowrap;
}
body.liquid-glass .admin-navigation .admin-nav-item > span:first-child {
    width: 20px;
    height: 24px;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    color: inherit;
}
body.liquid-glass .admin-navigation .admin-nav-item strong { font-size: 12px; }
body.liquid-glass .admin-navigation .admin-nav-item small { display: none; }
body.liquid-glass .admin-navigation .admin-nav-item:hover { background: var(--surface-hover); color: var(--text-primary); }
body.liquid-glass .admin-navigation .admin-nav-item.active { background: transparent; color: var(--primary-color); }
body.liquid-glass .admin-navigation .admin-nav-item:focus-visible { outline: 2px solid var(--primary-color); outline-offset: -3px; }
body.liquid-glass .admin-content-area { width: 100%; }
body.liquid-glass .admin-content-area .admin-tab-selector { display: none; }

/* 原生复选框继续负责语义、点击和键盘；玻璃轨道不截获交互。 */
body.liquid-glass .glass-toggle {
    position: relative;
    display: inline-flex;
    flex: 0 0 54px;
    width: 54px;
    height: 44px;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
}
body.liquid-glass .glass-toggle > input[type="checkbox"] {
    position: absolute;
    inset: 0;
    z-index: 2;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    opacity: 0;
    cursor: pointer;
}
body.liquid-glass .glass-toggle-track {
    position: relative;
    display: block;
    width: 54px;
    height: 32px;
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    background: var(--glass-sheen), var(--glass-panel);
    box-shadow: var(--glass-control-shadow), inset 0 1px 4px var(--glass-depth);
    pointer-events: none;
    backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturation));
    transition: background-color .22s ease, border-color .22s ease, opacity .22s ease;
}
body.liquid-glass .glass-toggle-track::before {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    z-index: 1;
    box-sizing: border-box;
    width: 24px;
    height: 24px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--glass-sheen), var(--glass-reading);
    box-shadow: var(--glass-control-shadow);
    transform: translateX(0);
    transition: transform .22s ease;
}
body.liquid-glass .glass-toggle-track::after {
    content: '−';
    position: absolute;
    top: 50%;
    right: 8px;
    color: var(--text-secondary);
    font-size: 12px;
    line-height: 1;
    transform: translateY(-50%);
}
body.liquid-glass .glass-toggle > input:checked + .glass-toggle-track {
    border-color: color-mix(in srgb, var(--primary-color) 45%, var(--glass-edge));
    background: var(--glass-sheen), color-mix(in srgb, var(--primary-color) 24%, var(--glass-control));
}
body.liquid-glass .glass-toggle > input:checked + .glass-toggle-track::before { transform: translateX(22px); }
body.liquid-glass .glass-toggle > input:checked + .glass-toggle-track::after { content: '✓'; right: auto; left: 8px; color: var(--primary-color); }
body.liquid-glass .glass-toggle > input:focus-visible + .glass-toggle-track { outline: 2px solid var(--primary-color); outline-offset: 3px; }
body.liquid-glass .glass-toggle > input:disabled { cursor: wait; }
body.liquid-glass .glass-toggle > input:disabled + .glass-toggle-track { opacity: .5; }

@media (forced-colors: active) {
    body.liquid-glass .glass-toggle-track { border-color: ButtonText; background: Canvas; }
    body.liquid-glass .glass-toggle-track::before { border-color: ButtonText; background: ButtonText; box-shadow: none; }
    body.liquid-glass .glass-toggle > input:checked + .glass-toggle-track { border-color: Highlight; background: Highlight; }
    body.liquid-glass .glass-toggle > input:checked + .glass-toggle-track::before { background: HighlightText; }
    body.liquid-glass .glass-toggle > input:checked + .glass-toggle-track::after { color: HighlightText; }
}

@media (prefers-reduced-motion: reduce) {
    body.liquid-glass *, body.liquid-glass *::before, body.liquid-glass *::after {
        animation: none !important;
        transition: none !important;
        scroll-behavior: auto !important;
    }
}