:root {
    --primary-color: #4A90D9;
    --secondary-color: #6C757D;
    --success-color: #28A745;
    --info-color: #17A2B8;
    --warning-color: #FFC107;
    --danger-color: #DC3545;
    --light-bg: #F8F9FA;
    --border-radius: 8px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
}

* { box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background-color: #F0F2F5;
    color: #333;
    min-height: 100vh;
    opacity: 0;
    animation: fadeIn 0.4s ease forwards;
}

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

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* 页面内容动画 */
.container.mt-4 {
    animation: slideUp 0.5s ease;
}

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
    border-bottom: 1px solid #e9ecef;
    transition: all var(--transition-normal);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.navbar:hover {
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.navbar-brand {
    font-size: 1.2rem;
    color: var(--primary-color) !important;
    transition: all var(--transition-fast);
}

.navbar-brand:hover {
    transform: scale(1.02);
}

.header-logo {
    height: 32px;
    width: auto;
    object-fit: contain;
    transition: transform var(--transition-fast);
}

.header-logo:hover {
    transform: rotate(5deg) scale(1.1);
}

.nav-link {
    color: #555 !important;
    font-size: 0.9rem;
    padding: 0.5rem 0.8rem !important;
    border-radius: 6px;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: all var(--transition-normal);
    transform: translateX(-50%);
}

.nav-link:hover {
    color: var(--primary-color) !important;
    background-color: rgba(74, 144, 217, 0.08);
    transform: translateY(-1px);
}

.nav-link:hover::before {
    width: 80%;
}

.nav-link.active {
    color: var(--primary-color) !important;
    background-color: rgba(74, 144, 217, 0.1);
}

.nav-link.active::before {
    width: 80%;
}

/* 卡片 */
.card {
    border-radius: var(--border-radius);
    transition: all var(--transition-normal);
    animation: slideUp 0.4s ease;
    animation-fill-mode: both;
}

.card:nth-child(1) { animation-delay: 0.05s; }
.card:nth-child(2) { animation-delay: 0.1s; }
.card:nth-child(3) { animation-delay: 0.15s; }
.card:nth-child(4) { animation-delay: 0.2s; }

.card:hover {
    box-shadow: 0 8px 25px rgba(0,0,0,0.1);
    transform: translateY(-3px);
}

.card-header {
    border-bottom: 1px solid #e9ecef;
    padding: 1rem 1.25rem;
    transition: background-color var(--transition-fast);
}

/* 统计卡片特殊效果 */
.card.bg-primary, .card.bg-success, .card.bg-danger, .card.bg-info, .card.bg-warning {
    transition: all var(--transition-normal);
}

.card.bg-primary:hover, .card.bg-success:hover, .card.bg-danger:hover, .card.bg-info:hover, .card.bg-warning:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 12px 30px rgba(0,0,0,0.15);
}

/* 按钮 */
.btn {
    border-radius: 6px;
    font-size: 0.9rem;
    padding: 0.4rem 1rem;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255,255,255,0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.5s, height 0.5s;
}

.btn:active::after {
    width: 200px;
    height: 200px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

.btn-primary:hover {
    background-color: #3A7BC8;
    border-color: #3A7BC8;
}

.btn-outline-primary:hover, .btn-outline-success:hover, .btn-outline-danger:hover, .btn-outline-warning:hover, .btn-outline-info:hover, .btn-outline-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* 表格 */
.table th {
    font-weight: 600;
    font-size: 0.85rem;
    color: #555;
    white-space: nowrap;
    transition: background-color var(--transition-fast);
}

.table td {
    vertical-align: middle;
    transition: all var(--transition-fast);
}

.table-hover tbody tr {
    transition: all var(--transition-fast);
}

.table-hover tbody tr:hover {
    background-color: rgba(74, 144, 217, 0.04);
    transform: scale(1.005);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.table-hover tbody tr:hover td {
    color: #333;
}

/* 徽章 */
.badge {
    font-weight: 500;
    padding: 0.4em 0.8em;
    font-size: 0.8rem;
    transition: all var(--transition-fast);
}

.badge:hover {
    transform: scale(1.05);
}

/* 表单 */
.form-control, .form-select {
    transition: all var(--transition-fast);
    border: 1px solid #dee2e6;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(74, 144, 217, 0.15);
    transform: translateY(-1px);
}

.form-control:hover, .form-select:hover {
    border-color: #adb5bd;
}

.form-label {
    transition: color var(--transition-fast);
    font-weight: 500;
}

.form-control:focus + .form-label,
.form-select:focus + .form-label {
    color: var(--primary-color);
}

/* 模态框 */
.modal-content {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    animation: scaleIn 0.3s ease;
}

.modal-header {
    border-bottom: 1px solid #e9ecef;
    padding: 1rem 1.5rem;
}

.modal-body { padding: 1.5rem; }

.modal-footer {
    border-top: 1px solid #e9ecef;
    padding: 1rem 1.5rem;
}

.modal-backdrop {
    transition: opacity var(--transition-normal);
}

.modal-backdrop.show {
    opacity: 0.5;
}

/* 提示框 */
.alert {
    border-radius: var(--border-radius);
    border: none;
    animation: slideUp 0.3s ease;
    transition: all var(--transition-normal);
}

.alert:hover {
    transform: translateX(3px);
}

/* 下拉菜单 */
.dropdown-menu {
    transition: all var(--transition-normal);
    transform-origin: top;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.dropdown-menu.show {
    animation: scaleIn 0.2s ease;
}

.dropdown-item {
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background-color: rgba(74, 144, 217, 0.08);
    transform: translateX(5px);
}

/* 分页 */
.pagination .page-link {
    transition: all var(--transition-fast);
    border-radius: 6px;
    margin: 0 2px;
}

.pagination .page-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 3px 8px rgba(0,0,0,0.1);
}

/* 链接 */
a {
    transition: all var(--transition-fast);
}

a:hover {
    text-decoration: none !important;
}

/* 页脚 */
footer {
    background: transparent;
    font-size: 0.85rem;
    transition: all var(--transition-normal);
}

/* 加载骨架屏 */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

/* 进度条 */
.progress {
    transition: all var(--transition-normal);
    overflow: hidden;
}

.progress-bar {
    transition: width 0.8s ease;
}

/* 标签页 */
.nav-tabs .nav-link {
    transition: all var(--transition-fast);
    border: none;
    border-bottom: 2px solid transparent;
}

.nav-tabs .nav-link:hover {
    border-bottom-color: rgba(74, 144, 217, 0.3);
    transform: none;
}

.nav-tabs .nav-link.active {
    border-bottom-color: var(--primary-color);
    background: none;
}

/* 手风琴 */
.accordion-button {
    transition: all var(--transition-fast);
}

.accordion-button:not(.collapsed) {
    background-color: rgba(74, 144, 217, 0.05);
    color: var(--primary-color);
}

.accordion-collapse {
    transition: all var(--transition-normal);
}

/* 工具提示 */
.tooltip {
    transition: all var(--transition-fast);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 15px rgba(74, 144, 217, 0.4);
    transition: all var(--transition-normal);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 999;
    cursor: pointer;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-3px) scale(1.1);
    box-shadow: 0 8px 25px rgba(74, 144, 217, 0.5);
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 选中状态 */
::selection {
    background-color: rgba(74, 144, 217, 0.2);
    color: #333;
}

/* 焦点轮廓 */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 禁用状态 */
.btn:disabled, .form-control:disabled, .form-select:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* 响应式优化 */
@media (max-width: 768px) {
    .container { padding: 0 1rem; }
    .card-body { padding: 1rem; }
    .table { font-size: 0.85rem; }
    .btn { padding: 0.35rem 0.75rem; font-size: 0.85rem; }
    .navbar-nav { padding-top: 0.5rem; }
    .nav-link { padding: 0.4rem 0.6rem !important; font-size: 0.85rem; }
    h4 { font-size: 1.1rem; }
    .display-4 { font-size: 2rem; }

    .card:hover {
        transform: translateY(-2px);
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }
}

@media (max-width: 576px) {
    .row.g-4 > * { margin-bottom: 0.5rem; }
    .d-flex.gap-2 { flex-wrap: wrap; }
    .btn-group-sm .btn { padding: 0.2rem 0.5rem; font-size: 0.75rem; }

    .table-hover tbody tr:hover {
        transform: none;
    }
}

/* 打印优化 */
@media print {
    .navbar, .back-to-top, .btn, footer {
        display: none !important;
    }

    .card {
        box-shadow: none !important;
        border: 1px solid #ddd;
    }

    body {
        background: white;
        color: black;
    }
}

/* 减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}