/* ============================================
   电商运营数据分析知识网页 - 布局样式
   包含：导航栏、侧边栏、页脚、响应式、移动端
   ============================================ */

/* ============================================
   导航栏
   ============================================ */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(252,251,249,0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}
.navbar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #1e3a5f, #2d6a9f, #4a90c4, #2d6a9f, #1e3a5f);
    z-index: 101;
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--primary-color);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.nav-logo img {
    transition: all var(--transition-fast);
}

.nav-logo:hover {
    color: var(--primary-light);
}

.nav-logo:hover img {
    transform: translateY(-1px);
}

.nav-brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.3;
}

.nav-brand-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-brand-slogan {
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.3px;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: var(--spacing-xs);
}

.nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    z-index: 99;
}

.mobile-menu.active {
    display: block;
}

.mobile-link {
    display: block;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: background var(--transition-fast);
}

.mobile-link:hover {
    background: var(--bg-color);
}

/* ============================================
   布局容器
   ============================================ */
.layout-container {
    display: flex;
    min-height: calc(100vh - 64px);
    margin-top: 64px;
}

/* ============================================
   左侧固定侧边栏
   ============================================ */
.sidebar {
    position: fixed;
    left: 0;
    top: 64px;
    width: 260px;
    height: calc(100vh - 64px);
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 50;
}

.sidebar-content {
    padding: var(--spacing-lg);
}

.sidebar-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

/* 平台组 */
.platform-group {
    margin-bottom: var(--spacing-xs);
}

.platform-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--text-primary);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.platform-link:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

.platform-link.active {
    background: var(--primary-color);
    color: white;
}

.platform-icon {
    font-size: 1.125rem;
}

.platform-name {
    flex: 1;
    font-size: 0.9rem;
}

.platform-arrow {
    font-size: 0.75rem;
    transition: transform var(--transition-fast);
}

.platform-group.active .platform-arrow {
    transform: rotate(180deg);
}

/* 指标子菜单 */
.metrics-submenu {
    display: none;
    flex-direction: column;
    padding-left: var(--spacing-lg);
    margin-top: var(--spacing-xs);
    gap: var(--spacing-xs);
}

.platform-group.active .metrics-submenu {
    display: flex;
}

.metric-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.metric-link:hover {
    background: var(--bg-color);
    color: var(--primary-color);
    padding-left: var(--spacing-lg);
}

.metric-link.active {
    background: linear-gradient(90deg, rgba(26, 54, 93, 0.1) 0%, transparent 100%);
    color: var(--primary-color);
    font-weight: 500;
    border-left: 3px solid var(--primary-color);
    padding-left: calc(var(--spacing-md) - 3px);
}

.metric-icon {
    font-size: 0.875rem;
}

.metric-name {
    flex: 1;
}

/* 主内容区 */
.main-content {
    margin-left: 260px;
    width: calc(100% - 260px);
    padding: var(--spacing-xl) var(--spacing-lg);
    max-width: none;
    min-height: calc(100vh - 64px);
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: var(--spacing-2xl) var(--spacing-lg);
    margin-top: auto;
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
    text-align: center;
}

.footer-text {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

.footer-desc {
    font-size: 0.8rem;
    opacity: 0.7;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        width: 100%;
    }
    
    .formula-body {
        grid-template-columns: 1fr;
    }
    
    .formula-calculator {
        position: static;
    }
}

@media (max-width: 768px) {
    .nav-brand-text {
        display: none;
    }

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

    .nav-toggle {
        display: flex;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .platforms-grid,
    .metrics-nav-grid {
        grid-template-columns: 1fr;
    }
    
    .formula-nav {
        top: 64px;
    }
    
    .formula-header {
        padding: var(--spacing-md);
    }
    
    .formula-body {
        padding: var(--spacing-md);
    }
    
    .formula-name {
        font-size: 1.1rem;
    }
    
    .expression-content {
        font-size: 0.95rem;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: var(--spacing-md);
    }
    
    .hero {
        padding: var(--spacing-xl);
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .preview-grid {
        grid-template-columns: 1fr;
    }
    
    .guide-steps {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   2024 重构 - 新版导航样式
   ============================================ */

/* 顶部导航按钮 */
.nav-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.nav-btn {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.nav-btn-login {
    color: var(--text-secondary);
}

.nav-btn-login:hover {
    color: var(--primary-color);
}

.nav-btn-register {
    background: var(--accent-color);
    color: white;
}

.nav-btn-register:hover {
    background: var(--accent-dark);
}

/* 用户菜单 */
.user-menu {
    position: relative;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    text-decoration: none;
    color: var(--text-primary);
}

.user-info:hover {
    background: var(--bg-color);
}

.user-avatar-small {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #2d6a9f, #1e3a5f);
    color: white;
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: 0 2px 8px rgba(30,58,95,0.25);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.user-avatar-small:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(30,58,95,0.35);
}

.user-name {
    font-size: 0.9rem;
    font-weight: 500;
}

/* 激活状态徽章 */
.user-badge {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    margin-left: 4px;
    cursor: help;
}

.user-badge i {
    font-size: 18px;
    transition: all var(--transition-fast);
}

/* VIP 徽章 - 金色渐变 */
.user-badge.vip i {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 2px 4px rgba(255, 215, 0, 0.3));
}

.user-badge.vip:hover i {
    transform: scale(1.15) rotate(5deg);
    filter: drop-shadow(0 3px 6px rgba(255, 215, 0, 0.5));
}

/* 免费用户徽章 - 灰色 */
.user-badge.free i {
    color: #9CA3AF;
    opacity: 0.6;
}

.user-badge.free:hover i {
    opacity: 0.8;
}

/* 徽章悬停提示框 */
.badge-tooltip {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: rgba(30, 41, 59, 0.95);
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 1001;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.badge-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: rgba(30, 41, 59, 0.95);
}

.user-badge:hover .badge-tooltip {
    opacity: 1;
    transform: translateX(-50%) translateY(-4px);
}

/* VIP 提示框特殊样式 */
.badge-tooltip.vip-tooltip {
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.95), rgba(255, 165, 0, 0.95));
    color: #1e293b;
    font-weight: 600;
}

.badge-tooltip.vip-tooltip::after {
    border-top-color: rgba(255, 215, 0, 0.95);
}

.user-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    right: 0;
    min-width: 180px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    z-index: 1000;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
}

.user-menu:hover .user-dropdown,
.user-dropdown:hover {
    display: block;
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

/* 使用伪元素填充间隙，确保鼠标移动时不会关闭下拉菜单 */
.user-menu::after {
    content: '';
    position: absolute;
    top: 100%;
    right: 0;
    width: 200px;
    height: 8px;
    background: transparent;
    z-index: 999;
    display: none;
}

.user-menu:hover::after {
    display: block;
}

/* 确保下拉菜单在鼠标悬停时保持显示 */
.user-dropdown::before {
    content: '';
    position: absolute;
    top: -8px;
    right: 0;
    width: 200px;
    height: 8px;
    background: transparent;
}

.dropdown-item {
    display: block;
    padding: 12px var(--spacing-md);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.dropdown-item:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

.dropdown-item:active {
    background: var(--border-light);
}

.dropdown-divider {
    height: 1px;
    background: var(--border-light);
    margin: var(--spacing-xs) 0;
}

/* 新版侧边栏 */
.sidebar-section {
    margin-bottom: var(--spacing-lg);
}

.sidebar-section .sidebar-header {
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: none;
}

.sidebar-section .sidebar-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    font-weight: 600;
}

/* 导航组 */
.nav-group {
    margin-bottom: 2px;
}

.nav-group-link {
    display: flex;
    align-items: flex-start;
    padding: 0.75rem var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
    margin: 0 var(--spacing-sm);
}

.nav-group-link:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

.nav-group-link.active {
    background: var(--primary-color);
    color: white;
}

.nav-group-link.disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ── 玻璃拟态图标（Glassmorphism） ── */
.nav-group-link .nav-icon {
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    align-self: center;
    flex-shrink: 0;
    margin-right: var(--spacing-sm);
    border-radius: 8px;
    font-size: 15px;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transition: all 0.25s ease;
    border: 1px solid rgba(255, 255, 255, 0.35);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    /* 默认蓝色 */
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(59, 130, 246, 0.06));
    color: #3b82f6;
}
.nav-group-link:hover .nav-icon {
    transform: scale(1.08);
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.1);
}
/* ── 颜色变体（通过 data-color 属性匹配） ── */
.nav-icon[data-color="purple"]  { background: linear-gradient(135deg, rgba(147, 51, 234, 0.18), rgba(168, 85, 247, 0.06)); color: #9333ea; border-color: rgba(168, 85, 247, 0.25); }
.nav-icon[data-color="blue"]    { background: linear-gradient(135deg, rgba(59, 130, 246, 0.18), rgba(96, 165, 250, 0.06)); color: #3b82f6; border-color: rgba(96, 165, 250, 0.25); }
.nav-icon[data-color="orange"]  { background: linear-gradient(135deg, rgba(249, 115, 22, 0.18), rgba(251, 146, 60, 0.06)); color: #f97316; border-color: rgba(251, 146, 60, 0.25); }
.nav-icon[data-color="green"]   { background: linear-gradient(135deg, rgba(34, 197, 94, 0.18), rgba(74, 222, 128, 0.06)); color: #16a34a; border-color: rgba(74, 222, 128, 0.25); }
.nav-icon[data-color="indigo"]  { background: linear-gradient(135deg, rgba(99, 102, 241, 0.18), rgba(129, 140, 248, 0.06)); color: #6366f1; border-color: rgba(129, 140, 248, 0.25); }
.nav-icon[data-color="amber"]   { background: linear-gradient(135deg, rgba(245, 158, 11, 0.18), rgba(252, 211, 77, 0.06)); color: #d97706; border-color: rgba(252, 211, 77, 0.25); }
.nav-icon[data-color="teal"]    { background: linear-gradient(135deg, rgba(20, 184, 166, 0.18), rgba(45, 212, 191, 0.06)); color: #0d9488; border-color: rgba(45, 212, 191, 0.25); }
.nav-icon[data-color="cyan"]    { background: linear-gradient(135deg, rgba(6, 182, 212, 0.18), rgba(34, 211, 238, 0.06)); color: #0891b2; border-color: rgba(34, 211, 238, 0.25); }
.nav-icon[data-color="rose"]    { background: linear-gradient(135deg, rgba(244, 63, 94, 0.18), rgba(251, 113, 133, 0.06)); color: #e11d48; border-color: rgba(251, 113, 133, 0.25); }
.nav-icon[data-color="sky"]     { background: linear-gradient(135deg, rgba(14, 165, 233, 0.18), rgba(56, 189, 248, 0.06)); color: #0284c7; border-color: rgba(56, 189, 248, 0.25); }
.nav-icon[data-color="lime"]    { background: linear-gradient(135deg, rgba(132, 204, 22, 0.18), rgba(163, 230, 53, 0.06)); color: #65a30d; border-color: rgba(163, 230, 53, 0.25); }
.nav-icon[data-color="red"]     { background: linear-gradient(135deg, rgba(239, 68, 68, 0.18), rgba(252, 165, 165, 0.06)); color: #dc2626; border-color: rgba(252, 165, 165, 0.25); }
/* 激活状态图标颜色反白 */
.nav-group-link.active .nav-icon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border-color: rgba(255, 255, 255, 0.3);
}

.nav-group-link .nav-text {
    flex: 1;
}

/* 导航组场景化描述 */
.nav-desc {
    display: block;
    font-size: 0.68rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-top: 1px;
    line-height: 1.3;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    opacity: 0.85;
}
.nav-group-link:hover .nav-desc {
    color: var(--primary-color);
    opacity: 0.75;
}
.nav-group-link.active .nav-desc {
    color: rgba(255, 255, 255, 0.75);
}

.nav-group-link .nav-arrow {
    font-size: 0.6rem;
    transition: transform var(--transition-fast);
    align-self: center;
    flex-shrink: 0;
    width: 1em;
    text-align: center;
}

.nav-group.active .nav-group-link .nav-arrow {
    transform: rotate(180deg);
}

.nav-badge {
    font-size: 0.65rem;
    padding: 2px 6px;
    border-radius: var(--radius-full);
    background: var(--text-muted);
    color: white;
}

.nav-badge.coming {
    background: var(--accent-color);
}

/* 子菜单 */
.nav-submenu {
    display: none;
    padding-left: var(--spacing-md);
}

.nav-group.active .nav-submenu {
    display: block;
}

/* 侧边栏子菜单分隔线 */
.nav-submenu-divider {
    padding: 8px 16px 4px;
    font-size: 11px;
    color: var(--text-secondary, #999);
    letter-spacing: 0.5px;
    border-top: 1px solid var(--border-color, #eee);
    margin-top: 4px;
}

.nav-submenu-link {
    display: flex;
    align-items: center;
    padding: 0.5rem var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.85rem;
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
    margin: 2px var(--spacing-sm);
    overflow: hidden;
    min-width: 0;
}

.nav-submenu-link:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

.nav-submenu-link.active {
    background: rgba(26, 54, 93, 0.1);
    color: var(--primary-color);
    font-weight: 500;
}

.nav-submenu-link .nav-icon {
    width: 20px;
    flex-shrink: 0;
    text-align: center;
    margin-right: var(--spacing-sm);
    font-size: 0.8rem;
}

.nav-submenu-link .nav-text {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.nav-arrow-sm {
    font-size: 0.5rem;
    color: var(--text-muted);
    margin-left: auto;
}

/* 深层子菜单 */
.nav-submenu-group {
    position: relative;
}

.nav-deep-submenu {
    display: none;
    padding-left: var(--spacing-md);
}

.nav-submenu-group.active .nav-deep-submenu,
.nav-submenu-group:hover .nav-deep-submenu {
    display: block;
}

.nav-deep-link {
    display: flex;
    align-items: center;
    padding: 0.4rem var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.8rem;
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
    margin: 2px var(--spacing-sm);
}

.nav-deep-link:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

.nav-deep-link.active {
    color: var(--accent-color);
}

.nav-deep-link .nav-icon {
    width: 18px;
    text-align: center;
    margin-right: var(--spacing-sm);
    font-size: 0.75rem;
}

/* ============================================
   移动端底部Tab导航
   ============================================ */
.mobile-tab-bar {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    z-index: 1000;
    justify-content: space-around;
    align-items: center;
    padding: 0 var(--spacing-sm);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

.tab-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    color: var(--text-muted);
    font-size: 0.7rem;
    transition: all var(--transition-fast);
    min-width: 50px;
}

.tab-item.active {
    color: var(--primary-color);
}

.tab-icon {
    font-size: 1.25rem;
    margin-bottom: 2px;
}

.tab-text {
    font-weight: 500;
}

/* 移动端面板 */
.mobile-panel {
    display: none;
    position: fixed;
    bottom: 60px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    box-shadow: var(--shadow-xl);
    z-index: 999;
    max-height: 75vh;
    overflow-y: auto;
    transform: translateY(100%);
    transition: transform var(--transition-normal);
}

.mobile-panel.active {
    transform: translateY(0);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    background: var(--bg-card);
}

.panel-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.panel-close {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-muted);
    border-radius: var(--radius-full);
}

.panel-content {
    padding: var(--spacing-sm) var(--spacing-md);
}

.panel-link {
    display: flex;
    align-items: center;
    padding: 0.75rem var(--spacing-md);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    margin-bottom: 0.25rem;
    transition: all var(--transition-fast);
}

.panel-link:hover {
    background: var(--bg-color);
}

.panel-icon {
    margin-right: var(--spacing-md);
    font-size: 1.25rem;
}

.panel-divider {
    height: 1px;
    background: var(--border-light);
    margin: var(--spacing-md) 0;
}

.panel-subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-md);
}

.mobile-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
}

.mobile-overlay.active {
    display: block;
}

/* ============================================
   2024 响应式 - 移动端适配
   ============================================ */
@media (max-width: 1024px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .platforms-grid-new {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    /* 显示底部Tab */
    .mobile-tab-bar {
        display: flex;
    }
    
    /* 隐藏顶部登录按钮（底部Tab"我的"面板替代） */
    .nav-actions {
        display: none;
    }
    
    /* 隐藏汉堡菜单按钮（底部Tab导航替代） */
    .nav-toggle {
        display: none !important;
    }
    
    /* 调整主内容区底部间距 */
    .main-content {
        padding-bottom: 80px;
    }
    
    /* 调整页脚位置 */
    .footer {
        margin-bottom: 60px;
    }
    
    /* 调整Hero */
    .hero-new {
        padding: var(--spacing-xl);
        padding-bottom: calc(var(--spacing-xl) + 30px);
    }
    
    .hero-new .hero-title {
        font-size: 1.5rem;
    }
    
    /* 调整功能卡片 */
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
    }
    
    .platforms-grid-new {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .waimai-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .quick-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .metrics-grid {
        grid-template-columns: 1fr;
    }
    
    /* 公式项 */
    .formula-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    .platforms-grid-new {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .waimai-grid {
        grid-template-columns: 1fr;
    }
    
    .quick-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .page-title {
        font-size: 1.25rem;
    }
}

/* ============================================
   移动端底部Tab导航 - 增强版
   ============================================ */
@media (max-width: 768px) {
    /* 隐藏PC端侧边栏 */
    .sidebar {
        display: none;
    }
    
    /* 主内容全宽 */
    .layout-container {
        display: block;
    }
    
    .main-content {
        margin-left: 0;
        width: 100%;
        padding: var(--spacing-md);
        padding-bottom: 100px;
    }
    
    /* 底部Tab美化 */
    .mobile-tab-bar {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: 65px;
        background: var(--bg-card);
        border-top: 1px solid var(--border-color);
        z-index: 1000;
        justify-content: space-around;
        align-items: stretch;
        padding: 0;
        box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
    }
    
    .tab-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        flex: 1;
        padding: 8px 4px;
        color: var(--text-muted);
        font-size: 0.65rem;
        transition: all var(--transition-fast);
        position: relative;
        text-decoration: none;
    }
    
    .tab-item::before {
        content: '';
        position: absolute;
        top: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 0;
        height: 3px;
        background: var(--primary-color);
        border-radius: 0 0 3px 3px;
        transition: width var(--transition-fast);
    }
    
    .tab-item.active {
        color: var(--primary-color);
    }
    
    .tab-item.active::before {
        width: 40px;
    }
    
    .tab-icon {
        font-size: 1.4rem;
        margin-bottom: 4px;
        transition: transform var(--transition-fast);
    }
    
    .tab-item.active .tab-icon {
        transform: scale(1.1);
    }
    
    .tab-text {
        font-weight: 500;
        letter-spacing: 0.3px;
    }
    
    /* 面板样式增强 */
    .mobile-panel {
        display: block;
        position: fixed;
        bottom: 65px;
        left: 0;
        right: 0;
        background: var(--bg-card);
        border-radius: 20px 20px 0 0;
        box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.15);
        z-index: 999;
        max-height: 70vh;
        overflow-y: auto;
        transform: translateY(100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        -webkit-overflow-scrolling: touch;
    }
    
    .mobile-panel.active {
        transform: translateY(0);
    }
    
    .panel-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--border-light);
        position: sticky;
        top: 0;
        background: var(--bg-card);
        z-index: 1;
    }
    
    .panel-header h3 {
        font-size: 1.1rem;
        font-weight: 600;
        color: var(--text-primary);
    }
    
    .panel-close {
        width: 32px;
        height: 32px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem;
        color: var(--text-muted);
        background: var(--bg-color);
        border-radius: var(--radius-full);
        border: none;
        cursor: pointer;
        transition: all var(--transition-fast);
    }
    
    .panel-close:hover {
        background: var(--border-color);
        color: var(--text-primary);
    }
    
    .panel-content {
        padding: var(--spacing-md) var(--spacing-lg) var(--spacing-xl);
    }
    
    .panel-link {
        display: flex;
        align-items: center;
        padding: 14px var(--spacing-md);
        color: var(--text-primary);
        border-radius: var(--radius-lg);
        margin-bottom: 6px;
        transition: all var(--transition-fast);
        background: var(--bg-color);
        text-decoration: none;
    }
    
    .panel-link:hover,
    .panel-link:active {
        background: var(--primary-color);
        color: white;
    }
    
    .panel-icon {
        margin-right: var(--spacing-md);
        font-size: 1.4rem;
        width: 32px;
        text-align: center;
    }
    
    .panel-link span:last-child {
        font-weight: 500;
        font-size: 0.95rem;
    }
    
    .panel-divider {
        height: 1px;
        background: var(--border-light);
        margin: var(--spacing-lg) 0;
    }
    
    .panel-subtitle {
        font-size: 0.8rem;
        color: var(--text-muted);
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        margin-bottom: var(--spacing-md);
        padding-left: var(--spacing-sm);
    }
    
    /* 遮罩层 */
    .mobile-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.4);
        backdrop-filter: blur(2px);
        z-index: 998;
        opacity: 0;
        transition: opacity 0.3s ease;
    }
    
    .mobile-overlay.active {
        display: block;
        opacity: 1;
    }
    
    /* 页脚调整 */
    .footer {
        margin-bottom: 65px;
        padding: var(--spacing-lg);
    }
    
    .footer-text {
        font-size: 0.85rem;
    }
    
    .footer-desc {
        font-size: 0.75rem;
    }
    
    /* Hero调整 */
    .hero-new {
        padding: var(--spacing-lg);
        padding-bottom: calc(var(--spacing-lg) + 30px);
        margin: 0 calc(-1 * var(--spacing-md));
        margin-bottom: var(--spacing-lg);
        border-radius: 0;
    }

    .hero-new::before,
    .hero-new::after {
        display: none;
    }
    
    .hero-new .hero-title {
        font-size: 1.35rem;
        line-height: 1.3;
    }
    
    .hero-new .hero-subtitle {
        font-size: 0.95rem;
    }
    
    .hero-new .hero-desc {
        font-size: 0.8rem;
    }
    
    .floating-icon {
        display: none;
    }

    .hero-force-graph {
        display: none;
    }
    
    /* Section调整 */
    .section-block {
        margin-bottom: var(--spacing-xl);
    }
    
    .section-title {
        font-size: 1.1rem;
    }
    
    /* 功能卡片移动端 */
    .feature-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .feature-card {
        padding: var(--spacing-lg);
        flex-direction: row;
        align-items: center;
    }
    
    .feature-icon {
        font-size: 2rem;
        margin-bottom: 0;
        margin-right: var(--spacing-md);
    }
    
    .feature-card .feature-content {
        flex: 1;
    }
    
    .feature-title {
        font-size: 1rem;
        margin-bottom: var(--spacing-xs);
    }
    
    .feature-desc {
        font-size: 0.8rem;
        margin-bottom: var(--spacing-sm);
    }
    
    .feature-tools {
        display: none;
    }
    
    .feature-badge {
        top: 50%;
        right: var(--spacing-md);
        transform: translateY(-50%);
        font-size: 0.65rem;
        padding: 3px 8px;
    }
    
    .feature-arrow {
        position: static;
        margin-left: auto;
    }
    
    /* 内容卡片移动端 */
    .content-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .content-card {
        padding: var(--spacing-lg);
    }
    
    .content-icon {
        font-size: 2rem;
        margin-right: var(--spacing-md);
    }
    
    .content-title {
        font-size: 1rem;
    }
    
    .content-desc {
        font-size: 0.8rem;
    }
    
    /* 平台卡片移动端 */
    .platforms-grid-new {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
    }
    
    .platform-card-new {
        padding: var(--spacing-md);
    }
    
    .platform-icon-new {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }
    
    .platform-name-new {
        font-size: 0.8rem;
    }
    
    .platform-badge {
        font-size: 0.55rem;
        padding: 1px 4px;
    }
    
    /* 外卖卡片移动端 */
    .waimai-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
    }
    
    .waimai-card {
        padding: var(--spacing-md);
    }
    
    .waimai-icon {
        font-size: 1.75rem;
    }
    
    .waimai-name {
        font-size: 0.8rem;
    }
    
    /* 快速入口移动端 */
    .quick-access {
        padding: var(--spacing-md);
        margin: 0 calc(-1 * var(--spacing-md));
        border-radius: 0;
    }
    
    .quick-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .quick-card {
        padding: var(--spacing-md);
    }
    
    .quick-icon {
        font-size: 1.5rem;
    }
    
    .quick-name {
        font-size: 0.85rem;
    }
    
    /* 页面头部移动端 */
    .page-header {
        margin-bottom: var(--spacing-lg);
        padding-bottom: var(--spacing-md);
    }
    
    .breadcrumb {
        font-size: 0.75rem;
        flex-wrap: wrap;
    }
    
    .page-title {
        font-size: 1.25rem;
    }
    
    .page-desc {
        font-size: 0.85rem;
    }
    
    /* 知识库页面移动端 */
    .metrics-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .metric-card {
        padding: var(--spacing-lg);
        flex-direction: row;
        align-items: flex-start;
    }
    
    .metric-icon {
        font-size: 2rem;
        margin-bottom: 0;
        margin-right: var(--spacing-md);
    }
    
    .metric-card .metric-content {
        flex: 1;
    }
    
    .metric-title {
        font-size: 1rem;
    }
    
    .metric-arrow {
        position: static;
        align-self: center;
        margin-left: auto;
    }
    
    /* 公式列表移动端 */
    .formula-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
        padding: var(--spacing-md);
    }
    
    .formula-code {
        font-size: 0.75rem;
        max-width: 100%;
        overflow-x: auto;
    }
    
    /* Coming Soon移动端 */
    .coming-soon-box {
        padding: var(--spacing-xl);
    }
    
    .coming-icon {
        font-size: 3rem;
    }
    
    .coming-soon-box h2 {
        font-size: 1.25rem;
    }
}

/* ============================================
   超小屏幕适配 (iPhone SE等)
   ============================================ */
@media (max-width: 375px) {
    .mobile-tab-bar {
        height: 60px;
    }
    
    .tab-icon {
        font-size: 1.25rem;
    }
    
    .tab-text {
        font-size: 0.6rem;
    }
    
    .main-content {
        padding: var(--spacing-sm);
        padding-bottom: 90px;
    }
    
    .hero-new .hero-title {
        font-size: 1.2rem;
    }
    
    .platforms-grid-new {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .waimai-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .panel-link {
        padding: 12px var(--spacing-sm);
    }
    
    .panel-icon {
        font-size: 1.2rem;
        width: 28px;
    }
}

/* ============================================
   安全区域适配 (iPhone X及以上)
   ============================================ */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .mobile-tab-bar {
        padding-bottom: env(safe-area-inset-bottom);
        height: calc(65px + env(safe-area-inset-bottom));
    }
    
    .mobile-panel {
        bottom: calc(65px + env(safe-area-inset-bottom));
    }
    
    .footer {
        margin-bottom: calc(65px + env(safe-area-inset-bottom));
    }
    
    .main-content {
        padding-bottom: calc(100px + env(safe-area-inset-bottom));
    }
}

/* ============================================
   触摸设备优化
   ============================================ */
@media (hover: none) and (pointer: coarse) {
    .tab-item:active {
        background: var(--bg-color);
    }
    
    .panel-link:active {
        background: var(--primary-color);
        color: white;
        transform: scale(0.98);
    }
    
    .platform-card-new:active,
    .waimai-card:active,
    .quick-card:active {
        transform: scale(0.98);
    }
    
    /* 禁用hover效果 */
    .feature-card.active:hover,
    .content-card:hover,
    .platform-card-new:hover,
    .waimai-card:hover,
    .quick-card:hover,
    .metric-card:hover {
        transform: none;
    }
}

/* ============================================
   移动端面板 - 网格布局
   ============================================ */
.panel-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

.panel-grid.cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.panel-grid-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.panel-grid-item:active {
    background: var(--primary-color);
    color: white;
    transform: scale(0.95);
}

.panel-grid-icon {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xs);
}

.panel-grid-name {
    font-size: 0.8rem;
    font-weight: 500;
    text-align: center;
}

/* ============================================
   移动端面板 - 用户中心
   ============================================ */
.user-avatar-box {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.user-avatar {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    margin: 0 auto var(--spacing-md);
    box-shadow: var(--shadow-lg);
}

.user-tip {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.panel-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 14px var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.panel-btn-primary {
    background: var(--primary-color);
    color: white;
}

.panel-btn-primary:active {
    background: var(--primary-dark);
    transform: scale(0.98);
}

.panel-btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.panel-btn-outline:active {
    background: var(--primary-color);
    color: white;
    transform: scale(0.98);
}

.panel-btn .panel-icon {
    font-size: 1.2rem;
}

/* Tab打开状态 */
.tab-item.panel-open {
    color: var(--primary-color);
}

.tab-item.panel-open::before {
    width: 40px;
}

/* ============================================
   移动端平滑过渡
   ============================================ */
.mobile-panel {
    transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1);
}

.mobile-panel.active {
    transform: translateY(0);
}

.mobile-overlay {
    transition: opacity 0.3s ease;
}