* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 119, 198, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(120, 200, 255, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 24px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.3);
    position: relative;
    z-index: 1;
}

header {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.8) 0%, rgba(118, 75, 162, 0.8) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: white;
    padding: 40px 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

/* 滚动公告栏样式 */
.announcement-bar {
    display: flex;
    align-items: center;
    padding: 12px 30px;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 
        0 2px 8px rgba(0, 0, 0, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.announcement-bar.hidden {
    display: none;
}

.announcement-icon {
    font-size: 1.2em;
    margin-right: 12px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.announcement-content {
    flex: 1;
    overflow: hidden;
    position: relative;
    height: 24px;
    mask-image: linear-gradient(to right, transparent 0%, black 5%, black 95%, transparent 100%);
    -webkit-mask-image: linear-gradient(to right, transparent 0%, black 5%, black 95%, transparent 100%);
}

.announcement-scroll {
    display: flex;
    gap: 60px;
    animation: scroll 40s linear infinite;
    white-space: nowrap;
    will-change: transform;
}

.announcement-scroll:hover {
    animation-play-state: paused;
}

.announcement-item {
    display: inline-block;
    color: #495057;
    font-size: 0.9em;
    font-weight: 500;
    padding: 0 20px;
    white-space: nowrap;
    flex-shrink: 0;
}

.announcement-close {
    background: none;
    border: none;
    color: #999;
    font-size: 1.5em;
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
    margin-left: 12px;
    line-height: 1;
}

.announcement-close:hover {
    background: rgba(220, 53, 69, 0.1);
    color: #dc3545;
    transform: scale(1.1);
}

@keyframes scroll {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

/* 公告栏响应式设计 */
@media (max-width: 768px) {
    .announcement-bar {
        padding: 10px 15px;
    }
    
    .announcement-icon {
        font-size: 1em;
        margin-right: 8px;
    }
    
    .announcement-item {
        font-size: 0.85em;
        padding: 0 15px;
    }
    
    .announcement-close {
        width: 20px;
        height: 20px;
        font-size: 1.2em;
    }
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
    text-align: center;
}

.header-stats {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.stat-card {
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    padding: 24px 32px;
    border-radius: 20px;
    text-align: center;
    min-width: 160px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: 
        0 12px 40px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
    background: rgba(255, 255, 255, 0.3);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-label {
    display: block;
    font-size: 0.9em;
    opacity: 0.9;
    margin-bottom: 8px;
}

.stat-value {
    display: block;
    font-size: 2em;
    font-weight: bold;
}

.stat-value.warning {
    color: #ffd700;
}

.toolbar {
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding: 20px 30px;
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 
        0 2px 8px rgba(0, 0, 0, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
    position: relative;
    z-index: 100;
}

.toolbar-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 15px;
    width: 100%;
    flex-wrap: wrap;
}

.toolbar-actions {
    display: flex;
    gap: 10px;
    align-items: center;
    position: relative;
    z-index: 101;
    flex: 1;
    justify-content: flex-end;
}

.toolbar-auth {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-left: auto;
    padding-left: 20px;
    border-left: 1px solid rgba(255, 255, 255, 0.3);
}

/* 下拉菜单样式 - 现代化毛玻璃效果 */
.dropdown {
    position: relative !important;
    display: inline-block !important;
    z-index: 1000 !important;
}

.dropdown.active {
    z-index: 10000 !important;
}

.dropdown-menu {
    display: none !important;
    position: absolute !important;
    top: calc(100% + 10px) !important;
    right: 0 !important;
    left: auto !important;
    background: rgba(220, 220, 230, 0.95) !important;
    backdrop-filter: blur(40px) saturate(180%) !important;
    -webkit-backdrop-filter: blur(40px) saturate(180%) !important;
    border-radius: 20px !important;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.2),
        0 8px 24px rgba(0, 0, 0, 0.15),
        0 0 0 1px rgba(200, 200, 210, 0.7),
        inset 0 1px 0 rgba(255, 255, 255, 0.8),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1) !important;
    min-width: 220px !important;
    max-width: 280px !important;
    z-index: 99999 !important;
    overflow: hidden !important;
    border: 1px solid rgba(200, 200, 210, 0.7) !important;
    opacity: 0 !important;
    transform: translateY(-10px) scale(0.95) !important;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
    pointer-events: none !important;
    margin: 0 !important;
    padding: 10px !important;
}

.dropdown-menu::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
        rgba(180, 180, 190, 0.1) 0%, 
        rgba(200, 200, 210, 0.1) 100%
    );
    pointer-events: none;
    border-radius: 20px;
    z-index: -1;
}

.dropdown.active .dropdown-menu {
    display: block !important;
    opacity: 1 !important;
    transform: translateY(0) scale(1) !important;
    pointer-events: auto !important;
    visibility: visible !important;
}

/* 下拉菜单项样式 */
.dropdown-item {
    display: block;
    padding: 14px 20px;
    color: #333;
    text-decoration: none;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 10px;
    font-size: 0.95em;
    font-weight: 500;
    margin: 2px 0;
    position: relative;
    overflow: hidden;
    background: transparent;
}

/* 确保所有下拉菜单项（包括添加产品和添加分类）使用相同的样式 */
.dropdown-item,
#addProductItem,
#addCategoryItem {
    color: #333;
    background: transparent;
}

.dropdown-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    opacity: 0;
    transition: opacity 0.25s ease;
    border-radius: 10px;
}

.dropdown-item:hover::before {
    opacity: 1;
}

.dropdown-item:hover,
#addProductItem:hover,
#addCategoryItem:hover {
    color: #667eea;
    padding-left: 28px;
    transform: translateX(4px);
    background: rgba(102, 126, 234, 0.08);
    box-shadow: 
        0 2px 8px rgba(102, 126, 234, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.dropdown-item:active,
#addProductItem:active,
#addCategoryItem:active {
    transform: translateX(2px) scale(0.98);
    background: rgba(102, 126, 234, 0.1);
}

.dropdown-item:last-child {
    margin-bottom: 0;
}

/* 下拉菜单分隔线 */
.dropdown-item:not(:last-child)::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 20px;
    right: 20px;
    height: 1px;
    background: linear-gradient(to right, 
        transparent, 
        rgba(0, 0, 0, 0.08), 
        transparent
    );
}

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


.search-box {
    display: flex;
    flex: 1;
    max-width: 400px;
    min-width: 200px;
    gap: 10px;
}

.search-box input {
    flex: 1;
    padding: 14px 24px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 16px;
    font-size: 0.95em;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    color: #495057;
    box-shadow: 
        0 4px 16px rgba(0, 0, 0, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.6),
        inset 0 -1px 0 rgba(0, 0, 0, 0.05);
}

.search-box input::placeholder {
    color: rgba(0, 0, 0, 0.5);
}

.search-box input:focus {
    outline: none;
    border-color: rgba(102, 126, 234, 0.6);
    background: rgba(255, 255, 255, 0.8);
    box-shadow: 
        0 8px 32px rgba(102, 126, 234, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.8),
        inset 0 -1px 0 rgba(0, 0, 0, 0.05);
    transform: translateY(-2px);
}

.search-btn {
    padding: 14px 24px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.9), rgba(118, 75, 162, 0.9));
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 16px;
    cursor: pointer;
    font-size: 1.1em;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    box-shadow: 
        0 4px 16px rgba(102, 126, 234, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
}

.search-btn:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 1), rgba(118, 75, 162, 1));
    transform: translateY(-3px) scale(1.05);
    box-shadow: 
        0 8px 32px rgba(102, 126, 234, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.5),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn {
    padding: 14px 28px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 16px;
    font-size: 0.95em;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 600;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    box-shadow: 
        0 4px 16px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
    opacity: 0;
    transition: opacity 0.3s;
    z-index: 0;
}

.btn:hover::before {
    opacity: 1;
}

.btn > * {
    position: relative;
    z-index: 1;
}

.btn-primary {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.9), rgba(118, 75, 162, 0.9));
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 
        0 8px 32px rgba(102, 126, 234, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 1), rgba(118, 75, 162, 1));
    transform: translateY(-3px) scale(1.02);
    box-shadow: 
        0 12px 48px rgba(102, 126, 234, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.5),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-primary:active {
    transform: translateY(-1px) scale(1);
    box-shadow: 
        0 6px 24px rgba(102, 126, 234, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    color: #495057;
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: 
        0 4px 16px rgba(0, 0, 0, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.6),
        inset 0 -1px 0 rgba(0, 0, 0, 0.05);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.8);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.12),
        inset 0 1px 0 rgba(255, 255, 255, 0.8),
        inset 0 -1px 0 rgba(0, 0, 0, 0.05);
    border-color: rgba(255, 255, 255, 0.7);
    color: #212529;
}

.btn-secondary:active {
    transform: translateY(-1px) scale(1);
    box-shadow: 
        0 4px 16px rgba(0, 0, 0, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

/* 登录后的功能键样式（更亮的颜色） */
.btn-logged-in {
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.95), rgba(33, 136, 56, 0.95)) !important;
    color: white !important;
    border: 1px solid rgba(255, 255, 255, 0.4) !important;
    box-shadow: 
        0 8px 32px rgba(40, 167, 69, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1) !important;
}

.btn-logged-in:hover {
    background: linear-gradient(135deg, rgba(40, 167, 69, 1), rgba(33, 136, 56, 1)) !important;
    transform: translateY(-3px) scale(1.02) !important;
    box-shadow: 
        0 12px 48px rgba(40, 167, 69, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.5),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1) !important;
}

.btn-logged-in:active {
    transform: translateY(-1px) scale(1) !important;
    box-shadow: 
        0 6px 24px rgba(40, 167, 69, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.3) !important;
}

/* 退出按钮样式（成功/绿色） */
.btn-success {
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.9), rgba(33, 136, 56, 0.9)) !important;
    color: white !important;
    border: 1px solid rgba(255, 255, 255, 0.4) !important;
    box-shadow: 
        0 8px 32px rgba(40, 167, 69, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1) !important;
    padding: 10px 20px !important;
    border-radius: 12px !important;
    font-size: 0.95em !important;
    font-weight: 600 !important;
    cursor: pointer !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
}

.btn-success:hover {
    background: linear-gradient(135deg, rgba(40, 167, 69, 1), rgba(33, 136, 56, 1)) !important;
    transform: translateY(-3px) scale(1.02) !important;
    box-shadow: 
        0 12px 48px rgba(40, 167, 69, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.5),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1) !important;
}

.btn-success:active {
    transform: translateY(-1px) scale(1) !important;
    box-shadow: 
        0 6px 24px rgba(40, 167, 69, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.3) !important;
}

.btn-danger {
    background: linear-gradient(135deg, rgba(220, 53, 69, 0.9), rgba(200, 35, 51, 0.9));
    color: white;
    padding: 10px 18px;
    font-size: 0.9em;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 
        0 4px 16px rgba(220, 53, 69, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
}

.btn-danger:hover {
    background: linear-gradient(135deg, rgba(220, 53, 69, 1), rgba(200, 35, 51, 1));
    transform: translateY(-3px) scale(1.05);
    box-shadow: 
        0 8px 32px rgba(220, 53, 69, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
    border-color: rgba(255, 255, 255, 0.4);
}

.btn-edit {
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.9), rgba(33, 136, 56, 0.9));
    color: white;
    padding: 10px 18px;
    font-size: 0.9em;
    margin-right: 8px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 
        0 4px 16px rgba(40, 167, 69, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
}

.btn-edit:hover {
    background: linear-gradient(135deg, rgba(40, 167, 69, 1), rgba(33, 136, 56, 1));
    transform: translateY(-3px) scale(1.05);
    box-shadow: 
        0 8px 32px rgba(40, 167, 69, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
    border-color: rgba(255, 255, 255, 0.4);
}

.btn-stock {
    background: linear-gradient(135deg, rgba(23, 162, 184, 0.9), rgba(19, 132, 150, 0.9));
    color: white;
    padding: 10px 18px;
    font-size: 0.9em;
    margin-right: 8px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 
        0 4px 16px rgba(23, 162, 184, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.3),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
}

.btn-stock:hover {
    background: linear-gradient(135deg, rgba(23, 162, 184, 1), rgba(19, 132, 150, 1));
    transform: translateY(-3px) scale(1.05);
    box-shadow: 
        0 8px 32px rgba(23, 162, 184, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.4),
        inset 0 -1px 0 rgba(0, 0, 0, 0.1);
    border-color: rgba(255, 255, 255, 0.4);
}

/* 主布局 */
.main-layout {
    display: flex;
    flex-direction: column;
    gap: 0;
    min-height: calc(100vh - 300px);
}

/* 横向分类导航 */
.category-nav-horizontal {
    background: transparent;
    padding: 0;
    margin: 0;
    z-index: 10;
    width: 100%;
}

.category-nav-header {
    margin-bottom: 10px;
}

.category-nav-header h3 {
    margin: 0;
    font-size: 1em;
    color: #495057;
    font-weight: 600;
}

.category-nav-content {
    overflow-x: auto;
    overflow-y: hidden;
    padding-bottom: 5px;
    scrollbar-width: thin;
    scrollbar-color: #667eea #f0f0f0;
}

.category-nav-content::-webkit-scrollbar {
    height: 6px;
}

.category-nav-content::-webkit-scrollbar-track {
    background: #f0f0f0;
    border-radius: 3px;
}

.category-nav-content::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 3px;
}

.category-nav-content::-webkit-scrollbar-thumb:hover {
    background: #5568d3;
}

.category-list-horizontal {
    display: flex;
    gap: 10px;
    flex-wrap: nowrap;
    min-width: fit-content;
}

/* 旧的侧边栏样式已移除（已改为横向分类导航） */

.category-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.category-section {
    display: none; /* 隐藏旧的分类区域 */
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.category-header h3 {
    font-size: 1.2em;
    color: #333;
    margin: 0;
}

.category-grid {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.category-btn {
    padding: 12px 16px;
    border: none;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.9em;
    text-align: center;
    color: #495057;
    font-weight: 500;
    box-shadow: 
        0 2px 8px rgba(0, 0, 0, 0.05),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
    border-bottom: 3px solid transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    min-width: 80px;
    white-space: nowrap;
    flex-shrink: 0;
}

.category-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.1));
    opacity: 0;
    transition: opacity 0.3s;
    z-index: 0;
}

.category-btn:hover::before {
    opacity: 1;
}

.category-btn > * {
    position: relative;
    z-index: 1;
}

.category-btn span:first-child,
.category-btn .category-icon-img,
.category-btn .category-icon-emoji {
    font-size: 1.1em;
    opacity: 0.7;
    transition: opacity 0.3s, transform 0.3s;
    display: inline-block;
    margin-right: 8px;
    vertical-align: middle;
}

.category-btn:hover span:first-child,
.category-btn:hover .category-icon-img,
.category-btn:hover .category-icon-emoji {
    opacity: 1;
    transform: scale(1.1);
}

.category-btn.active span:first-child,
.category-btn.active .category-icon-img,
.category-btn.active .category-icon-emoji {
    opacity: 1;
    transform: scale(1.1);
}

.category-btn .category-icon-img img {
    width: 24px;
    height: 24px;
    object-fit: contain;
    vertical-align: middle;
    display: block;
}

.category-btn .category-name {
    font-size: 0.85em;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100px;
    text-align: center;
    width: 100%;
}

.category-btn span:last-child {
    font-size: 0.85em;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100px;
}

.category-btn:hover {
    color: #667eea;
    background: rgba(102, 126, 234, 0.08);
    border-bottom-color: rgba(102, 126, 234, 0.5);
    transform: translateY(-2px);
    box-shadow: 
        0 4px 12px rgba(102, 126, 234, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.category-btn.active {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.15), rgba(118, 75, 162, 0.15));
    color: #667eea;
    border-bottom-color: #667eea;
    font-weight: 600;
    box-shadow: 
        0 4px 16px rgba(102, 126, 234, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.9);
    position: relative;
}

.category-btn.active::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 3px 3px 0 0;
}

.category-btn.active:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(118, 75, 162, 0.2));
    transform: translateY(-2px);
}

.category-add-btn {
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.2), rgba(33, 136, 56, 0.2)) !important;
    border: 2px dashed rgba(40, 167, 69, 0.5) !important;
    color: #28a745 !important;
    font-weight: 600;
}

.category-add-btn:hover {
    background: linear-gradient(135deg, rgba(40, 167, 69, 0.3), rgba(33, 136, 56, 0.3)) !important;
    border-color: rgba(40, 167, 69, 0.7) !important;
    color: #218838 !important;
    transform: translateY(-3px) scale(1.05);
    box-shadow: 
        0 8px 32px rgba(40, 167, 69, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.category-empty {
    text-align: center;
    padding: 40px 20px;
    color: #999;
    font-size: 0.9em;
}

/* 主内容区 */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* 响应式设计 */
@media (max-width: 968px) {
    .main-layout {
        flex-direction: column;
    }
    
    /* 旧的侧边栏响应式样式已移除 */
    
    .category-list,
    .category-list-horizontal {
        flex-direction: row;
        flex-wrap: nowrap;
        gap: 8px;
        overflow-x: auto;
    }
    
    .category-btn {
        min-width: 70px;
        padding: 10px 12px;
        font-size: 0.85em;
    }
    
    .category-nav-horizontal {
        padding: 12px 15px;
    }
    
    .category-btn {
        flex: 1;
        min-width: 120px;
        text-align: center;
    }
}

.products-container {
    flex: 1;
    padding: 30px;
    overflow-x: auto;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    position: relative;
    z-index: 1;
}

.products-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: transparent;
}

.products-table thead {
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.products-table th {
    padding: 18px 20px;
    text-align: left;
    font-weight: 600;
    color: #495057;
    border-bottom: 2px solid rgba(0, 0, 0, 0.08);
    font-size: 0.9em;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.products-table td {
    padding: 18px 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.products-table tbody tr {
    transition: all 0.3s ease;
}

.products-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.6);
    transform: translateX(4px);
    box-shadow: -4px 0 12px rgba(102, 126, 234, 0.1);
}

.products-table tbody tr.empty-row {
    text-align: center;
    color: #999;
    font-style: italic;
}

.products-table tbody tr.empty-row:hover {
    background: white;
}

.status-badge {
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 600;
    display: inline-block;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 
        0 2px 8px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
    transition: all 0.3s ease;
}

.status-badge:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 
        0 4px 12px rgba(0, 0, 0, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.status-in-stock {
    background: rgba(40, 167, 69, 0.2);
    color: #155724;
    border-color: rgba(40, 167, 69, 0.3);
}

.status-low-stock {
    background: rgba(255, 193, 7, 0.2);
    color: #856404;
    border-color: rgba(255, 193, 7, 0.3);
}

.status-out-of-stock {
    background: rgba(220, 53, 69, 0.2);
    color: #721c24;
    border-color: rgba(220, 53, 69, 0.3);
}

.action-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex !important;
    visibility: visible !important;
    opacity: 1 !important;
}

/* 管理后台的模态框需要更高的z-index */
#categoryModal.active,
#userModal.active {
    z-index: 10000 !important;
    display: flex !important;
    visibility: visible !important;
    opacity: 1 !important;
}

.modal-content {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 24px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.6),
        inset 0 -1px 0 rgba(0, 0, 0, 0.05);
    animation: slideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    border-bottom: 1px solid #e0e0e0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.modal-header h2 {
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    color: white;
    font-size: 2em;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background 0.3s;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

form {
    padding: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #495057;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 14px;
    font-size: 0.95em;
    font-family: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 
        0 4px 16px rgba(0, 0, 0, 0.06),
        inset 0 1px 0 rgba(255, 255, 255, 0.6),
        inset 0 -1px 0 rgba(0, 0, 0, 0.05);
    color: #495057;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: rgba(102, 126, 234, 0.6);
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 
        0 8px 32px rgba(102, 126, 234, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.8),
        inset 0 -1px 0 rgba(0, 0, 0, 0.05);
    transform: translateY(-2px);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.radio-group {
    display: flex;
    gap: 20px;
    margin-top: 10px;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-weight: normal;
}

.radio-group input[type="radio"] {
    width: auto;
    cursor: pointer;
}

.stock-info {
    padding: 20px 30px;
    background: #f8f9fa;
    border-bottom: 1px solid #e0e0e0;
}

.stock-info p {
    margin: 8px 0;
    font-size: 1.05em;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .container {
        border-radius: 16px;
    }

    header {
        padding: 20px 15px;
    }

    header h1 {
        font-size: 1.5em;
        margin-bottom: 15px;
    }

    .header-stats {
        flex-direction: column;
        gap: 10px;
    }

    .stat-card {
        width: 100%;
        padding: 15px 20px;
        min-width: auto;
    }

    .stat-label {
        font-size: 0.85em;
    }

    .stat-value {
        font-size: 1.8em;
    }

    .toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: 15px;
        padding: 15px;
    }

    .toolbar-row {
        flex-direction: column;
        gap: 10px;
    }
    
    .toolbar-actions {
        flex-direction: column;
        gap: 8px;
        width: 100%;
    }

    .toolbar-actions .btn {
        width: 100%;
        padding: 12px 16px;
        font-size: 0.9em;
    }

    .toolbar-auth {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        border-top: 1px solid rgba(255, 255, 255, 0.3);
        padding-top: 15px;
        margin-top: 15px;
        width: 100%;
        justify-content: space-between;
        flex-direction: row;
    }

    .toolbar-auth .btn {
        flex: 1;
        margin: 0 5px;
    }

    .search-box {
        max-width: 100%;
        width: 100%;
    }

    .search-box input {
        font-size: 16px; /* 防止iOS自动缩放 */
        padding: 12px 45px 12px 15px;
    }

    .category-nav-horizontal {
        padding: 10px 15px;
    }

    .category-nav-header h3 {
        font-size: 0.9em;
        margin-bottom: 8px;
    }

    .category-list-horizontal {
        gap: 8px;
    }

    .category-btn {
        min-width: 80px;
        padding: 10px 12px;
        font-size: 0.8em;
    }

    .category-btn img {
        width: 24px;
        height: 24px;
    }

    .products-container {
        padding: 15px 10px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .products-table {
        font-size: 0.85em;
        min-width: 800px; /* 确保表格可以横向滚动 */
    }

    .products-table th,
    .products-table td {
        padding: 10px 8px;
        white-space: nowrap;
    }

    .products-table th:first-child,
    .products-table td:first-child {
        position: sticky;
        left: 0;
        background: rgba(255, 255, 255, 0.95);
        z-index: 10;
        box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
    }

    .action-buttons {
        flex-direction: column;
        gap: 5px;
        min-width: 80px;
    }

    .action-buttons button {
        width: 100%;
        padding: 8px 12px;
        font-size: 0.8em;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .modal-content {
        width: 95%;
        max-width: 95%;
        margin: 10px auto;
        max-height: 90vh;
        padding: 20px 15px;
    }

    .modal-content h2 {
        font-size: 1.3em;
    }

    .form-group {
        margin-bottom: 15px;
    }

    .form-group label {
        font-size: 0.9em;
    }

    .form-group input,
    .form-group textarea,
    .form-group select {
        font-size: 16px; /* 防止iOS自动缩放 */
        padding: 12px;
    }

    .btn {
        padding: 12px 20px;
        font-size: 0.9em;
        touch-action: manipulation; /* 优化触摸响应 */
    }

    /* 下拉菜单在移动端的优化 */
    .dropdown-menu {
        position: static;
        width: 100%;
        margin-top: 5px;
        box-shadow: none;
        border: 1px solid rgba(0, 0, 0, 0.1);
    }

    /* 统计卡片在移动端的优化 */
    .stat-card {
        font-size: 0.9em;
    }
}

/* 超小屏幕优化（手机竖屏） */
@media (max-width: 480px) {
    header h1 {
        font-size: 1.3em;
    }

    .stat-card {
        padding: 12px 15px;
    }

    .stat-value {
        font-size: 1.5em;
    }

    .toolbar {
        padding: 10px;
    }

    .category-btn {
        min-width: 70px;
        padding: 8px 10px;
        font-size: 0.75em;
    }

    .products-table {
        font-size: 0.8em;
    }

    .products-table th,
    .products-table td {
        padding: 8px 6px;
    }

    .action-buttons button {
        padding: 6px 10px;
        font-size: 0.75em;
    }
}

/* 错误消息样式 */
.error-message {
    background: #fee;
    color: #c33;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 15px;
    font-size: 0.9em;
    border-left: 4px solid #c33;
    display: none;
}

.error-message.show {
    display: block;
}

/* 登录按钮样式 */
.btn-secondary {
    background: #6c757d;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.3s;
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(108, 117, 125, 0.3);
}