/**
 * layout.css — Simple-mode, reset, visual-lab density, body, and app shell.
 * Split from style.css with rule order preserved.
 */
/* ==================== 简约模式 ==================== */
body.no-blur::before {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background: rgba(0, 0, 0, var(--bg-overlay-opacity));
}

body.no-blur.light-theme::before {
    background: rgba(255, 255, 255, var(--bg-overlay-opacity));
}

body.no-blur .sidebar {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

body.no-blur .modal {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

body.no-blur .card.has-bg,
body.no-blur body.view-style-2 .card.has-bg {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

/* 避免嵌套毛玻璃导致文字虚化与严重的渲染损耗 (Double Blur Fix) */
body:not(.no-blur) .card,
body:not(.no-blur) .category-section-title,
body:not(.no-blur) .tab-btn {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

/* 字体边缘锐化与文字阴影补偿，强行提升模糊/高光背景下的文本对比度与可读性 */
.card h3, 
body.view-style-2 .card h3 {
    text-shadow: 0 1px 1px rgba(0, 0, 0, 0.18);
    -webkit-font-smoothing: subpixel-antialiased !important;
    -moz-osx-font-smoothing: auto !important;
}

body.light-theme .card h3,
body.light-theme.view-style-2 .card h3 {
    text-shadow: 0 1px 1px rgba(255, 255, 255, 0.25);
}

/* 移动端减少阴影 */
@media (max-width: 768px) {
    .card:hover {
        box-shadow: 0 0 10px rgba(57, 157, 255, 0.3), 0 0 20px rgba(57, 157, 255, 0.1);
    }

    body.view-style-2 .card.has-bg:hover {
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2), 0 0 10px var(--card-bg-color, rgba(255,255,255,0.15));
    }
}

/* 分类管理动作 (Task 4.3) */
.sidebar-nav-item {
    position: relative;
    padding-right: 10px;
    /* Task 4.14: 允许气泡溢出 */
    overflow: visible !important;
}

.nav-actions {
    display: none;
    gap: 4px;
    margin-left: auto;
    opacity: 0;
    transition: all 0.2s ease;
}

/* 仅在管理模式下且悬停时显示分类操作按钮 */
body.page-manage-active .sidebar-nav-item:hover .nav-actions {
    display: flex;
    opacity: 1;
    transform: translateX(-2px);
}

.exit-manage-btn:hover {
    background: var(--primary) !important;
    color: white !important;
}

.nav-action-btn {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-dim);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.nav-action-btn:hover {
    background: var(--primary);
    color: white;
}

.nav-action-btn.active {
    background: var(--primary);
    color: white;
}

.nav-action-btn.delete:hover {
    background: #e74c3c;
}

/* 增强的管理状态栏 */
.admin-active-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 42px;
    background: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
    background-size: 200% 200%;
    animation: gradientBG 10s ease infinite;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    z-index: 9999;
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(0,0,0,0.4);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.2);
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.banner-exit-btn {
    background: #27ae60;
    border: none;
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 12px;
    font-weight: bold;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.banner-exit-btn:hover {
    background: #2ecc71;
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

/* 页面管理激活态全局视觉增强 (Task 9.1 & 9.3) */
body.page-manage-active .sidebar {
    border-right: 2px solid var(--primary);
    box-shadow: 4px 0 15px rgba(var(--primary-rgb), 0.1);
}

body.page-manage-active #grid-container {
    padding-top: 60px; /* 为顶部工具栏留出空间 */
    transition: padding 0.3s ease;
    filter: saturate(0.9); /* 轻微降低饱和度，突出编辑项 */
}

body.page-manage-active .card:hover {
    outline: 2px dashed var(--primary);
    outline-offset: 4px;
}

/* 隐藏误触项 (Task 9.3 & 9.5 专注模式) */
body.page-manage-active .logout-btn {
    display: none !important;
}

body.page-manage-active .summon-search-btn {
    opacity: 0 !important;
    pointer-events: none !important;
    transform: translateY(-20px) !important;
}

/* Task 9.5: 只有正在激活的管理按钮可见，隐藏同级其他工具按钮 (控制中心、实验室等) */
body.page-manage-active .sidebar-admin-toolbar .toolbar-item:not(.active) {
    display: none !important;
}

body.page-manage-active .sidebar-admin-toolbar {
    justify-content: center; /* 居中显示仅剩的一个按钮 */
    padding: 10px 0;
}

.banner-exit-btn:hover {
    background: #e74c3c;
    border-color: #e74c3c;
}

/* 优化批量操作条 */
.batch-actions-bar {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: rgba(15, 25, 35, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    padding: 12px 25px;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 25px;
    z-index: 4000;
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.batch-actions-bar.visible {
    transform: translateX(-50%) translateY(0);
}

.batch-btn {
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
    color: white;
}

/* Switch UI (Task 4.4) */
.switch-ui {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 22px;
}

.switch-ui input { 
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(255,255,255,0.1);
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--primary);
}

input:checked + .slider:before {
    transform: translateX(22px);
}

/* 视图切换动画 (Task 4.5.1) */
.category-section {
    animation: sectionFadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes sectionFadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 隔离模式下的布局优化 */
body.view-isolated .category-section {
    margin-top: 20px;
}

body.view-isolated .category-section-title {
    font-size: 24px;
    margin-bottom: 30px;
    text-align: center;
    border-bottom: none;
}

/* Task 4.6.3 & 26.1: 禅意隔离态进一步减噪，但保持材质一致性 */
body.zen-active .category-section-title {
    opacity: 0.6;
    font-weight: 300;
    letter-spacing: 2px;
    font-size: 20px;
}

body.zen-active .card {
    background: var(--glass);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

body.zen-active .card:hover {
    background: var(--glass-hover);
    border-color: var(--primary);
}

body.zen-active.light-theme .card {
    background: var(--glass);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    border-color: rgba(0, 0, 0, 0.1);
}

/* Task 26.2: 亮色模式下导航菜单与常去图标的感知度增强 */
body.light-theme .zen-menu-item,
body.light-theme .zen-freq-item {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    border-color: rgba(0, 0, 0, 0.08);
}

/* Task 9.2: 云端同步子菜单样式 */
.cloud-sync-btn {
    position: relative;
}

.sync-submenu {
    position: absolute;
    bottom: 100%;
    left: 0;
    background: var(--glass-card);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 8px;
    min-width: 180px;
    display: none;
    flex-direction: column;
    gap: 4px;
    z-index: 100;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
    margin-bottom: 10px;
    animation: menuSlideUp 0.3s ease;
}

.cloud-sync-btn:hover .sync-submenu,
.cloud-sync-btn:focus-within .sync-submenu {
    display: flex;
}

.sync-menu-item {
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-main);
    white-space: nowrap;
}

.sync-menu-item:hover {
    background: var(--glass-hover);
    color: var(--primary);
}

.sync-menu-item.active {
    background: var(--primary-color);
    color: white;
}

.sync-menu-header {
    font-size: 11px;
    color: var(--text-dim);
    padding: 6px 12px 2px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sync-divider {
    height: 1px;
    background: var(--glass-border);
    margin: 4px 8px;
}

@keyframes menuSlideUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 侧边栏折叠态适配 */
body.sidebar-folded .sync-submenu {
    left: 100%;
    bottom: 0;
    margin-bottom: 0;
    margin-left: 10px;
}

body.light-theme .zen-menu-item:hover,
body.light-theme .zen-freq-item:hover {
    background: var(--glass-hover);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

body.zen-active.light-theme .card:hover {
    background: rgba(0, 0, 0, 0.06);
}

/* 侧边栏管理态重构 (Task 4.5.2) */
body.page-manage-active .sidebar-nav-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    margin: 6px 8px;
    padding: 12px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

/* Task 10.7.1: 管理模式图标静止高亮，保持简洁 (Task 9.3 优化) */
body.page-manage-active .toolbar-item.active .nav-icon i {
    display: inline-block;
    color: var(--primary);
    filter: drop-shadow(0 0 5px var(--primary));
    transform: scale(1.1);
}

/* 移除之前的旋转动画 */
@keyframes icon-rotate {
    /* 保持定义以防其他地方引用，但此处不再调用 */
}

body.light-theme.page-manage-active .sidebar-nav-item {
    background: rgba(0, 0, 0, 0.02);
}

/* 书签计数器 */
.nav-count {
    font-size: 10px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-dim);
    padding: 1px 6px;
    border-radius: 10px;
    margin-left: 6px;
    font-family: monospace;
    opacity: 0.7;
}

body.light-theme .nav-count {
    background: rgba(0, 0, 0, 0.05);
}

/* 拖拽手柄增强 */
.sidebar-nav-item .nav-icon {
    cursor: grab;
    transition: transform 0.2s ease;
}

body.page-manage-active .sidebar-nav-item .nav-icon:hover {
    transform: scale(1.2);
    color: var(--primary);
}

/* 显隐状态高亮反馈 */
.is-hidden-cat {
    opacity: 0.5;
    filter: grayscale(80%);
    border-style: dashed !important;
}

/* 侧边栏图钉/悬浮逻辑 (Task 4.5.3) */
.sidebar-header {
    position: relative;
}

.sidebar-pin-btn {
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    opacity: 0.4;
    transition: all 0.3s ease;
    padding: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 5px;
}

.notice-center-btn {
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    opacity: 0.4;
    transition: all 0.3s ease;
    padding: 5px;
    margin-left: auto; /* 将公告按钮推至右侧 */
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 5px;
    position: relative;
    font-size: 18px;
}

.notice-center-btn:hover, .sidebar-pin-btn:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.1);
}

.notice-dot {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 8px;
    height: 8px;
    background: #e74c3c;
    border-radius: 50%;
    border: 1px solid #fff;
    display: none;
}

.notice-dot.active {
    display: block;
    animation: noticePulse 2s infinite cubic-bezier(0.4, 0, 0.6, 1);
}

@keyframes noticePulse {
    0% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.7); }
    70% { transform: scale(1.1); box-shadow: 0 0 0 6px rgba(231, 76, 60, 0); }
    100% { transform: scale(0.9); box-shadow: 0 0 0 0 rgba(231, 76, 60, 0); }
}

body.sidebar-pinned .sidebar-pin-btn {
    opacity: 1;
    color: var(--primary);
    transform: rotate(45deg);
}

/* 悬浮态 (Unpinned) */
body:not(.sidebar-pinned) .sidebar {
    position: fixed;
    transform: translateX(-100%);
    box-shadow: 20px 0 50px rgba(0,0,0,0.5);
}

body:not(.sidebar-pinned) .sidebar.open {
    transform: translateX(0);
}

body:not(.sidebar-pinned) .main-content {
    margin-left: 0;
}

/* ==================== 响应式侧边栏布局 (Phase 6) ==================== */

/* 1. Desktop 端 (> 1024px): 侧边栏只有 展开态(Pinned) 和 极简迷你态(Folded/Mini)，彻底消除完全隐藏抽屉态 */
@media (min-width: 1025px) {
    /* 大屏常规模式下，强行解除 translateX(-100%)，侧边栏保持原位 */
    body:not(.sidebar-pinned) .sidebar {
        transform: translateX(0) !important;
        box-shadow: none; /* 迷你态非悬浮，不需要巨大的卡片悬浮阴影 */
    }

    /* 当展开/固定时，主内容区让出 250px */
    body.sidebar-pinned .main-content {
        margin-left: var(--sidebar-width) !important;
    }

    /* 当极简迷你折叠时，主内容区让出 迷你宽度 (72px) */
    body.sidebar-folded .main-content {
        margin-left: var(--sidebar-mini-width) !important;
    }

    /* 兼容性与边界情况处理：既非 pinned 也非 folded 时，也设为 mini 宽度 */
    body:not(.sidebar-pinned):not(.sidebar-folded) .main-content {
        margin-left: var(--sidebar-mini-width) !important;
    }

    /* 大屏下彻底隐退侧边栏遮罩，防止阻挡大屏常驻排版 */
    .sidebar-overlay {
        display: none !important;
    }
}

/* 2. Tablet 端 (768px - 1024px): 极简图标模式 (T6.2 预留) */
@media (min-width: 768px) and (max-width: 1024px) {
    :root {
        --sidebar-actual-width: 70px;
    }

    .sidebar {
        width: var(--sidebar-actual-width);
    }

    /* 隐藏文字标签，仅保留图标 */
    .sidebar .sidebar-title,
    .sidebar .nav-label,
    .sidebar .nav-count,
    .sidebar .sidebar-user-section {
        display: none;
    }

    .sidebar-header {
        justify-content: center;
        padding: 20px 0;
    }

    .sidebar-nav-item {
        justify-content: center;
        padding: 12px 0;
    }

    .main-content {
        margin-left: var(--sidebar-actual-width);
    }
    
    .sidebar-pin-btn { display: none; }
}

/* 3. Mobile 端 (< 768px): 完全隐藏抽屉态 */
@media (max-width: 767px) {
    :root {
        --sidebar-actual-width: 250px;
    }

    .sidebar {
        width: var(--sidebar-actual-width);
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0 !important;
    }

    .sidebar-pin-btn { display: none; }
}

/* ==================== 管理态安全感知 (Task 4.5.5) ==================== */
body.page-manage-active::after {
    content: "";
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    border: 4px solid var(--primary);
    pointer-events: none;
    z-index: 9999;
    animation: adminPulse 2s infinite ease-in-out;
}

@keyframes adminPulse {
    0% { border-color: rgba(57, 157, 255, 0.4); box-shadow: inset 0 0 20px rgba(57, 157, 255, 0.2); }
    50% { border-color: rgba(57, 157, 255, 0.8); box-shadow: inset 0 0 40px rgba(57, 157, 255, 0.4); }
    100% { border-color: rgba(57, 157, 255, 0.4); box-shadow: inset 0 0 20px rgba(57, 157, 255, 0.2); }
}

body.page-manage-active.admin-mode::after {
    border-color: #e74c3c;
    animation: adminCriticalPulse 2s infinite ease-in-out;
}

@keyframes adminCriticalPulse {
    0% { border-color: rgba(231, 76, 60, 0.4); box-shadow: inset 0 0 20px rgba(231, 76, 60, 0.2); }
    50% { border-color: rgba(231, 76, 60, 0.8); box-shadow: inset 0 0 40px rgba(231, 76, 60, 0.4); }
    100% { border-color: rgba(231, 76, 60, 0.4); box-shadow: inset 0 0 20px rgba(231, 76, 60, 0.2); }
}

/* 禅意静默态 (Task 4.6.1 & 26.3) */
body.zen-active.zen-silent .grid-container,
body.zen-active.zen-silent .footer-info,
body.zen-active.zen-silent .category-section,
body.zen-active.zen-silent .zen-horizon,
body.zen-active.zen-silent .zen-expand-btn,
body.zen-active.zen-silent .quick-nav-group,
body.zen-active.zen-silent .sidebar-toggle,
body.zen-active.zen-silent .guest-login-bridge {
    opacity: 0 !important;
    transform: translateY(30px) !important;
    pointer-events: none !important;
    transition: all 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

body.zen-active.zen-silent .sidebar {
    transform: translateX(-100%) !important;
    transition: all 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

/* 导航视界过渡优化 */
.zen-horizon {
    display: none;
    flex-direction: column;
    align-items: flex-start; /* 统一左对齐 */
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 30px; /* 增加内边距，提供更多呼吸感 */
    z-index: 10;
    transition: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

body.zen-active .zen-horizon {
    display: flex;
    opacity: 1;
    transform: translateY(0);
}

body.zen-active:not(.zen-silent) .zen-horizon {
    margin-top: 140px; /* 为顶部搜索框留位 */
}

.zen-frequent-container {
    width: 100%;
    margin-bottom: 25px;
    display: flex;
    flex-direction: column;
    align-items: flex-start; /* 同步左对齐 */
}

.zen-freq-title {
    font-size: 12px;
    color: var(--text-dim);
    margin-bottom: 12px;
    opacity: 0.7;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.zen-freq-list {
    display: flex;
    gap: 15px;
    overflow-x: auto;
    padding: 5px 0; /* 取消左侧偏移，确保对齐基准线 */
    scrollbar-width: none;
}

.zen-freq-item {
    width: 42px;
    height: 42px;
    background: var(--glass);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 1px solid var(--glass-border);
    /* T8: Stagger 入场 */
    opacity: 0;
    transform: translateY(10px);
    animation: zenItemRise 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.zen-freq-item:hover {
    transform: translateY(-3px);
    background: var(--glass-hover);
    border-color: var(--primary);
}

.zen-freq-item img {
    width: 24px;
    height: 24px;
    object-fit: contain;
}

.zen-freq-item .emoji-icon {
    font-size: 20px;
}

.zen-nav-menu {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    overflow: visible;
    white-space: normal;
    width: 100%;
    max-width: 100%;
    gap: 10px;
    padding: 10px 0; /* 取消水平 padding，依靠父级 zen-horizon 的 padding 对齐 */
    margin-bottom: 20px;
    box-sizing: border-box;
}

/* 移动端菜单优化 (T9) */
@media (max-width: 768px) {
    .zen-menu-item {
        padding: 10px 22px; /* 更大的点击区域 */
        font-size: 15px;
    }
    
    .zen-freq-item {
        width: 48px;
        height: 48px;
    }
}

.zen-nav-menu::-webkit-scrollbar {
    display: none; /* Chrome/Safari — desktop wrap does not scroll */
}

/* 手机端禅意分类：单行横向滑动，避免换行把内容顶下去。 */
@media (max-width: 768px) {
    body.zen-active .zen-horizon {
        min-width: 0;
        max-width: 100%;
    }

    .zen-nav-menu {
        flex-wrap: nowrap;
        overflow-x: auto;
        overflow-y: hidden;
        -webkit-overflow-scrolling: touch;
        overscroll-behavior-x: contain;
        scroll-snap-type: x proximity;
        scrollbar-width: thin;
        width: 100%;
        max-width: 100%;
        min-width: 0;
        align-self: stretch;
        padding-bottom: 8px;
    }

    .zen-nav-menu::-webkit-scrollbar {
        display: block;
        height: 3px;
    }

    .zen-nav-menu::-webkit-scrollbar-thumb {
        background: rgba(255, 255, 255, 0.35);
        border-radius: 3px;
    }

    body.light-theme .zen-nav-menu::-webkit-scrollbar-thumb {
        background: rgba(0, 0, 0, 0.25);
    }

    .zen-menu-item {
        scroll-snap-align: start;
    }
}

.zen-menu-item {
    padding: 8px 18px;
    border-radius: 20px;
    background: var(--glass);
    color: var(--text-dim);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
    white-space: nowrap;
    max-width: 100%;
    box-sizing: border-box;
    /* T8: Stagger 入场 */
    opacity: 0;
    transform: translateY(10px);
    animation: zenItemRise 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes zenItemRise {
    to { opacity: 1; transform: translateY(0); }
}

.zen-menu-item:hover {
    background: var(--glass-hover);
    color: var(--text);
}

.zen-menu-item.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 4px 15px rgba(57, 157, 255, 0.3);
}

.zen-menu-item .menu-icon {
    font-size: 16px;
}

/* 禅意模式下隐藏网格内的重复标题 (T6) */
body.zen-active .category-section-title {
    display: none !important;
}

/* ==================== 全局重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

/* ==================== 视觉实验室 (Task 4.2) ==================== */
/* 密度控制 */
body.density-compact {
    --card-scale: 0.82;
    --card-font-scale: 0.85;
}
body.density-standard {
    --card-scale: 1.0;
    --card-font-scale: 1.0;
}
body.density-comfortable {
    --card-scale: 1.18;
    --card-font-scale: 1.1;
}

/* 网格布局适配变量 */
.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(var(--card-w), 1fr));
    gap: var(--grid-gap, 18px);
    padding: 10px 0;
}

/* 侧边栏风格 (锁定经典模式：极简弱边框设计) */
body.sidebar-style-classic .sidebar-nav-item {
    border: none;
    background: transparent;
    box-shadow: none;
}

body.sidebar-style-classic .sidebar-nav-item.active {
    background: rgba(57, 157, 255, 0.1);
    color: var(--primary);
    box-shadow: none;
    transform: none;
    font-weight: 700;
}

body.sidebar-style-classic .sidebar-nav-item.active::before {
    content: "";
    position: absolute;
    left: 0;
    top: 20%;
    bottom: 20%;
    width: 3px;
    background: var(--primary);
    border-radius: 0 4px 4px 0;
}

/* 视觉实验室 Tab 样式 */
.visual-lab-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    background: rgba(0,0,0,0.1);
    padding: 5px;
    border-radius: 10px;
}

.visual-option-group {
    margin-bottom: 10px;
}

.visual-option-label {
    font-size: 13px;
    color: var(--text-dim);
    margin-bottom: 8px;
    display: block;
}

.visual-btn-group {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* ==================== 页面主体样式 ==================== */
body {
    /* 动态自适应与密度选项重新计算 (确保紧凑/平衡/透气跟随 --card-scale 动态生效) */
    --card-w: calc(var(--card-w-base) * var(--card-scale));
    --card-h: calc(var(--card-h-base) * var(--card-scale));
    --grid-gap: calc(var(--grid-gap-base) * var(--card-scale));
    --icon-size: calc(32px * var(--card-scale));
    --emoji-size: calc(32px * var(--card-scale));

    /* Task 13.3 & 17.3: 全局视觉占位底色 (消除白屏) */
    background-color: #1a1c1e; 
    background-image: radial-gradient(circle at center, #2c3e50 0%, #000000 100%);
    background-repeat: no-repeat;
    background-position: center center;
    background-attachment: fixed;
    background-size: cover;
    min-height: 100vh;
    min-height: 100dvh;
    color: var(--text);
    overflow-x: hidden;
    transition: background-image 0.8s ease-in-out, background-color 0.5s ease;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    z-index: -1;
    transition: backdrop-filter 0.5s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.5s ease;
}

/* Task 19.2: 当存在图片背景时，优化亮色模式下的遮罩透明度，防止洗白图片 */
body.light-theme[data-bg-type="bing"]::before,
body.light-theme[data-bg-type="custom"]::before {
    background: rgba(255, 255, 255, 0.15); /* 降低亮色遮罩强度 */
    backdrop-filter: blur(10px); /* 略微降低模糊度以展现壁纸细节 */
}

/* 搜索态与激活态视觉深度隔离 (Task 2.5.2) */
body.search-active::before,
body.is-searching::before {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background: transparent !important;
}

/* 移除背景遮罩 (Task 12.3) */
body.no-bg-mask::before {
    background: transparent !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

body.search-active .grid-container,
body.is-searching .grid-container {
    filter: none;
    opacity: 0.3;
    pointer-events: none;
    transform: none;
    transition: all 0.4s ease;
}

/* 焦点环增强 (Task 2.5.3 & 30.2 & 31.3) */
.card:focus-visible,
.sidebar-nav-item:focus-visible,
.zen-menu-item:focus-visible,
.zen-freq-item:focus-visible,
.notice-center-btn:focus-visible,
.sidebar-pin-btn:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 4px;
    box-shadow: 0 0 25px var(--primary);
    animation: focus-pulse 1.5s infinite;
    z-index: 50; 
    position: relative;
    /* Task 31.3: 确保在禅意模式下聚焦即唤醒视觉 */
    opacity: 1 !important;
    visibility: visible !important;
}

@keyframes focus-pulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(57, 157, 255, 0.7); }
    70% { transform: scale(1.02); box-shadow: 0 0 0 10px rgba(57, 157, 255, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(57, 157, 255, 0); }
}

/* Zen Mode 展开动画曲线 (Task 2.5.1) */
.grid-container {
    transition: opacity 0.6s cubic-bezier(0.34, 1.56, 0.64, 1), transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ==================== 应用布局（左侧边栏 + 主内容） ==================== */
.app-layout {
    display: flex;
    min-height: 100vh;
    min-height: 100dvh;
}