/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4e73df;
    --primary-dark: #2e59d9;
    --primary-light: #eaecf4;
    --secondary-color: #1cc88a;
    --secondary-dark: #17a673;
    --warning-color: #f6c23e;
    --danger-color: #e74a3b;
    --dark-color: #5a5c69;
    --light-color: #f8f9fc;
    --gray-color: #858796;
    --border-color: #e3e6f0;
    --shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
}

body {
    font-family: 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: var(--light-color);
    display: flex;
    min-height: 100vh;
}

/* 侧边栏样式 */
.sidebar {
    width: 250px;
    background-color: var(--primary-color);
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    transition: all 0.3s;
    z-index: 1000;
}

.sidebar-header {
    padding: 1.5rem 1rem;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h1 {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.sidebar-header p {
    font-size: 0.8rem;
    opacity: 0.8;
}

.sidebar-nav {
    padding: 1rem 0;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav li {
    margin-bottom: 0.5rem;
}

.sidebar-nav a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    transition: all 0.3s;
}

.sidebar-nav a:hover, .sidebar-nav a.active {
    color: white;
    background-color: rgba(255, 255, 255, 0.1);
}

.sidebar-nav i {
    margin-right: 0.75rem;
    width: 1.25rem;
    text-align: center;
}

/* 主要内容区域样式 */
.main-content {
    flex: 1;
    margin-left: 250px;
    padding: 1.5rem;
    transition: all 0.3s;
}

/* 顶部导航栏样式 */
.top-nav {
    background-color: white;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 0.35rem;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-nav h2 {
    color: var(--dark-color);
    margin: 0;
}

.top-nav-actions {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.375rem 0.75rem;
    border-radius: 0.35rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
    border: none;
}

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

/* 数据统计卡片样式 */
.quick-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background-color: white;
    padding: 1.5rem;
    border-radius: 0.35rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card-icon {
    font-size: 2rem;
    margin-right: 1rem;
    color: var(--primary-color);
}

.stat-card-info {
    flex: 1;
}

.stat-card h3 {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--gray-color);
    margin-bottom: 0.25rem;
}

.stat-card .number {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--dark-color);
}

/* 最近活动区域样式 */
.recent-activities {
    background-color: white;
    padding: 1.5rem;
    border-radius: 0.35rem;
    box-shadow: var(--shadow);
}

.recent-activities h2 {
    color: var(--dark-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.activity-list {
    min-height: 200px;
}

.activity-item {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.activity-text {
    color: var(--dark-color);
}

.activity-date {
    color: var(--gray-color);
    font-size: 0.875rem;
}

/* 页脚样式 */
.footer {
    background-color: white;
    color: var(--gray-color);
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
    border-radius: 0.35rem;
    box-shadow: var(--shadow);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sidebar {
        width: 0;
        padding: 0;
    }
    
    .sidebar.active {
        width: 250px;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .main-content.active {
        margin-left: 250px;
    }
    
    .quick-stats {
        grid-template-columns: 1fr;
    }
    
    .top-nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    .top-nav-actions {
        width: 100%;
        justify-content: space-between;
    }
}

/* 课程表样式 */
.schedule-section {
    background: white;
    border-radius: 10px;
    padding: 20px;
    margin: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.schedule-section h2 {
    margin-bottom: 20px;
    color: #333;
}

.schedule-table {
    overflow-x: auto;
}

.schedule-table table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.schedule-table th {
    background-color: #f0f5ff;
    padding: 12px;
    text-align: center;
    font-weight: 600;
    color: #333;
    border: 1px solid #e6e6e6;
}

.schedule-table td {
    padding: 0;
    border: 1px solid #e0e0e0;
}

.time-slot {
    background-color: #f8f9fa;
    font-weight: 700;
    text-align: center;
    padding: 15px !important;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    font-size: 13px;
    white-space: nowrap;
}

.empty-slot {
    padding: 0;
    height: 100%;
    min-height: 120px;
    text-align: center;
    transition: background-color 0.3s ease;
    position: relative;
}

.empty-slot:hover .course-select {
    background-color: rgba(0, 0, 0, 0.05) !important;
}

.slot-content {
    padding: 8px;
    color: #666;
    font-size: 14px;
    text-align: center;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.slot-content[contenteditable="true"] {
    cursor: text;
    outline: none;
    border: 1px dashed transparent;
}

.slot-content[contenteditable="true"]:hover {
    border-color: var(--primary-color);
}

.slot-content[contenteditable="true"]:focus {
    border-color: var(--primary-color);
    background-color: #fff;
}

.slot-time {
    font-size: 12px;
    color: #999;
    text-align: center;
    padding: 4px;
    border-top: 1px solid #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.course-select {
    width: 100%;
    height: 100%;
    padding: 15px;
    border: none;
    background-color: transparent !important;
    font-size: 15px;
    font-weight: 600;
    color: #333;
    cursor: pointer;
    transition: all 0.3s ease;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    text-align: center;
    text-align-last: center;
    -webkit-text-align-last: center;
    -moz-text-align-last: center;
}

.course-select:hover {
    background-color: #f0f0f0;
}

/* 课程颜色样式 */
.course-select option {
    background-color: white !important;
    color: #333;
    padding: 10px;
    font-weight: 600;
    text-align: center;
    text-align-last: center;
}

.course-select option:first-child {
    background-color: #ffffff;
}

.course-select option:nth-child(2) {
    background-color: #f8f9fa;
}

.course-select option:nth-child(3) {
    background-color: #e3f2fd;
}

.course-select option:nth-child(4) {
    background-color: #f3e5f5;
}

.course-select option:nth-child(5) {
    background-color: #e8f5e9;
}

.course-select option:nth-child(6) {
    background-color: #fff3e0;
}

.course-select option:nth-child(7) {
    background-color: #fce4ec;
}

.course-select option:nth-child(8) {
    background-color: #e0f7fa;
}

.course-select option:nth-child(9) {
    background-color: #f1f8e9;
}

.course-select option:nth-child(10) {
    background-color: #fff8e1;
}

/* 选中状态的样式 */
.course-select:focus {
    outline: none;
    box-shadow: inset 0 0 0 2px #4CAF50;
}

.data-operations {
    display: flex;
    gap: 10px;
    margin: 20px 0;
    padding: 0 20px;
}

.data-operations .btn-primary {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s ease;
}

.data-operations .btn-primary:hover {
    background-color: #45a049;
}

.data-operations .btn-primary i {
    font-size: 16px;
}

.data-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.data-actions button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.data-actions .btn-primary {
    background-color: #2196F3;
    color: white;
}

.data-actions .btn-primary:hover {
    background-color: #1976D2;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.2);
}

.data-actions .btn-secondary {
    background-color: #f1f5f9;
    color: #475569;
}

.data-actions .btn-secondary:hover {
    background-color: #e2e8f0;
    color: #1e293b;
}

.data-actions i {
    font-size: 16px;
}

/* 隐藏文件输入框但保持其功能 */
#importDataInput {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}