body {
    font-size: .875rem;
    background-color: #f5f8ff;
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root {
    --primary-color: #4e73df;
    --primary-dark: #3a5bc7;
    --primary-light: #eaefff;
    --success-color: #1cc88a;
    --success-dark: #0bb679;
    --success-light: #e6fff5;
    --info-color: #36b9cc;
    --info-dark: #2596be;
    --info-light: #e6f9ff;
    --warning-color: #f6c23e;
    --warning-dark: #e6b226;
    --warning-light: #fffbeb;
    --danger-color: #e74a3b;
    --danger-dark: #d32a1a;
    --danger-light: #ffefed;
    --secondary-color: #858796;
    --light-color: #f8f9fc;
    --dark-color: #5a5c69;
    --sidebar-dark: #4361ee;
    --sidebar-dark-hover: #3a56d4;
    --transition-standard: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.feather {
    width: 16px;
    height: 16px;
    vertical-align: text-bottom;
}

/*
 * Sidebar
 */

.sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100; /* Behind the navbar */
    padding: 0; /* 删除顶部填充，使菜单更靠上 */
    box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
    background: linear-gradient(135deg, #4776E6 0%, #8E54E9 100%); /* 更丰富的渐变色背景 */
    transition: var(--transition-standard);
    height: 100vh; /* 使侧边栏占满整个高度 */
    border-right: 1px solid rgba(255, 255, 255, 0.1);
    min-width: 180px; /* 最小宽度 */
    max-width: 250px; /* 最大宽度 */
    width: fit-content; /* 根据内容自动调整宽度 */
    overflow-x: hidden; /* 防止水平滚动 */
    position: relative; /* 为伪元素定位做准备 */
    will-change: transform;
    backface-visibility: hidden;
    transform: translateZ(0);
    transition: transform 0.3s ease;
}

/* 添加背景图案效果 */
.sidebar::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='%23ffffff' fill-opacity='0.05' fill-rule='evenodd'/%3E%3C/svg%3E");
    background-size: 150px 150px;
    opacity: 0.3;
    z-index: 0;
    pointer-events: none; /* 确保不干扰用户交互 */
}

/* 为侧边栏内容添加相对位置，确保显示在图案之上 */
.sidebar > * {
    position: relative;
    z-index: 1;
}

@media (max-width: 767.98px) {
    .sidebar {
        top: 5rem;
    }
}

.sidebar-sticky {
    position: relative;
    top: 0;
    height: calc(100vh - 48px);
    padding-top: .5rem;
    overflow-x: hidden;
    overflow-y: auto; /* Scrollable contents if viewport is shorter than content. */
}

/* 为侧边栏添加顶部装饰 */
.sidebar::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, 
        #ff9a9e 0%, 
        #fad0c4 15%, 
        #fad0c4 25%, 
        #a18cd1 50%, 
        #fbc2eb 75%, 
        #ff9a9e 100%);
    z-index: 2;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* 为管理员信息容器添加特殊背景 */
.admin-profile {
    padding: 1rem 0.75rem;
    margin-bottom: 1.2rem;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.admin-profile::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    opacity: 0.5;
    transform: rotate(30deg);
    pointer-events: none;
}

/* 为侧边栏菜单项添加悬停动画效果 */
.sidebar .nav-link {
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    padding: 0.65rem 0.75rem;
    margin-bottom: 0.25rem;
    border-left: 3px solid transparent;
    transition: all 0.3s ease-in-out;
    font-size: 0.85rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
    position: relative;
    z-index: 1;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    -moz-osx-font-smoothing: grayscale;
}

.sidebar .nav-link::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.1);
    transition: width 0.3s ease;
    z-index: -1;
}

.sidebar .nav-link:hover::before {
    width: 100%;
}

.sidebar .nav-link.active::before {
    width: 100%;
    background-color: rgba(255, 255, 255, 0.15);
}

.sidebar .nav-link:hover {
    color: white;
    transform: translateX(3px);
}

/* 美化侧边栏标题 */
.sidebar-heading {
    font-size: .7rem;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.6);
    padding: 0.9rem 1rem 0.4rem;
    margin-bottom: 0;
    font-weight: 600;
    letter-spacing: 0.05em;
    position: relative;
}

.sidebar-heading::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 1rem;
    width: 2rem;
    height: 2px;
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.5), transparent);
}

/* Main Content */
main {
    transition: var(--transition-standard);
    background-color: #f5f8ff;
}

/* Card Styles */
.card {
    margin-bottom: 1.5rem;
    border: none;
    border-radius: 1rem;
    box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.08);
    transition: var(--transition-standard);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0.5rem 2rem 0 rgba(58, 59, 69, 0.12);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    font-weight: 600;
    padding: 1.2rem 1.5rem;
    display: flex;
    align-items: center;
}

.card-header i {
    margin-right: 0.7rem;
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* Dashboard Cards */
.bg-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark)) !important;
}

.bg-success {
    background: linear-gradient(135deg, var(--success-color), var(--success-dark)) !important;
}

.bg-info {
    background: linear-gradient(135deg, var(--info-color), var(--info-dark)) !important;
}

.bg-warning {
    background: linear-gradient(135deg, var(--warning-color), var(--warning-dark)) !important;
}

.bg-danger {
    background: linear-gradient(135deg, var(--danger-color), var(--danger-dark)) !important;
}

.card-footer {
    background-color: transparent;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    padding: 0.9rem 1.5rem;
}

/* Tables */
.table {
    color: var(--dark-color);
    border-collapse: separate;
    border-spacing: 0 0.5rem;
}

.table th {
    background-color: rgba(78, 115, 223, 0.08);
    border: none;
    color: var(--dark-color);
    font-weight: 600;
    padding: 1rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.table td {
    vertical-align: middle;
    padding: 1rem;
    border: none;
    background-color: white;
}

.table tr {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    border-radius: 0.5rem;
    transition: var(--transition-standard);
}

.table tr:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.table tr td:first-child {
    border-top-left-radius: 0.5rem;
    border-bottom-left-radius: 0.5rem;
}

.table tr td:last-child {
    border-top-right-radius: 0.5rem;
    border-bottom-right-radius: 0.5rem;
}

/* Buttons */
.btn {
    border-radius: 0.75rem;
    font-weight: 500;
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    transition: var(--transition-standard);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.btn i {
    margin-right: 0.5rem;
    font-size: 1rem;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
}

.btn-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.8rem;
    border-radius: 0.5rem;
}

/* Form controls */
.form-control {
    border-radius: 0.75rem;
    padding: 0.6rem 1rem;
    border: 1px solid rgba(0, 0, 0, 0.1);
    transition: var(--transition-standard);
    font-size: 0.9rem;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(78, 115, 223, 0.15);
}

.form-label {
    font-weight: 500;
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

/* Badges */
.badge {
    font-weight: 500;
    padding: 0.4rem 0.8rem;
    border-radius: 0.5rem;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(77, 115, 223, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(77, 115, 223, 0); }
    100% { box-shadow: 0 0 0 0 rgba(77, 115, 223, 0); }
}

.pulse {
    animation: pulse 1.5s infinite;
}

/* Responsive adjustments */
@media (max-width: 767.98px) {
    .card {
        margin-bottom: 1rem;
    }
    
    .btn {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }
    
    .table th, .table td {
        padding: 0.75rem;
    }
    
    .card-header {
        padding: 1rem;
    }
    
    .sidebar .nav-link {
        padding: 0.6rem 0.8rem;
        margin: 0.2rem 0.5rem;
    }
}

/* Shadows */
.shadow-sm {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075) !important;
}

.shadow {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.1) !important;
}

.shadow-lg {
    box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.15) !important;
}

/* Alerts */
.alert {
    border-radius: 0.75rem;
    border: none;
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 0.25rem 1rem rgba(0, 0, 0, 0.08);
}

.alert-success {
    background-color: var(--success-light);
    color: var(--success-dark);
}

.alert-danger {
    background-color: var(--danger-light);
    color: var(--danger-dark);
}

.alert-info {
    background-color: var(--info-light);
    color: var(--info-dark);
}

.alert-warning {
    background-color: var(--warning-light);
    color: var(--warning-dark);
}

/* Modal styling */
.modal-content {
    border: none;
    border-radius: 1rem;
    box-shadow: 0 0.5rem 2rem rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

.modal-header {
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 1.25rem 1.5rem;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    padding: 1.25rem 1.5rem;
}

/* Admin logo styling */
.admin-logo {
    padding: 1.5rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 0.5rem;
    margin: 0 0.7rem 1.5rem;
}

/* Custom input groups */
.input-group {
    border-radius: 0.75rem;
    overflow: hidden;
}

.input-group-text {
    background-color: rgba(78, 115, 223, 0.05);
    border-color: rgba(0, 0, 0, 0.1);
    color: var(--primary-color);
}

/* 减少重绘和回流 */
.sidebar-link, .nav-link {
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    -moz-osx-font-smoothing: grayscale;
}

/* 减少重绘和回流 */
.sidebar-content {
    height: calc(100vh - 65px);
    overflow-y: auto;
    overflow-x: hidden;
    will-change: scroll-position;
    transform: translate3d(0, 0, 0);
}

/* 滚动条样式优化 */
.sidebar-content::-webkit-scrollbar {
    width: 6px;
}

.sidebar-content::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
}

.sidebar-content::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}