/* 学生成绩管理系统样式 */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    background: #2c3e50;
    color: white;
    padding: 15px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

.navbar-brand {
    color: white;
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: bold;
}

.navbar-menu {
    display: flex;
    gap: 20px;
    align-items: center;
}

.navbar-menu a {
    color: #ecf0f1;
    text-decoration: none;
    transition: color 0.3s;
}

.navbar-menu a:hover {
    color: #3498db;
}

.user-info {
    color: #95a5a6;
    padding: 0 10px;
}

.btn-logout {
    background: #e74c3c;
    padding: 5px 15px;
    border-radius: 4px;
}

.btn-logout:hover {
    background: #c0392b;
    color: white !important;
}

/* 主内容区 */
main {
    padding: 30px 20px;
    min-height: calc(100vh - 180px);
}

h1 {
    color: #2c3e50;
    margin-bottom: 20px;
}

/* 登录页面 */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
}

.auth-switch {
    margin-top: 18px;
    text-align: center;
    color: #7f8c8d;
    font-size: 14px;
}

.auth-switch a {
    color: #3498db;
    text-decoration: none;
}

.auth-switch a:hover {
    text-decoration: underline;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #555;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
}

.form-card {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    max-width: 600px;
}

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.3s;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

.btn-danger {
    background: #e74c3c;
    color: white;
}

.btn-danger:hover {
    background: #c0392b;
}

.btn-outline {
    background: transparent;
    border: 1px solid #ddd;
    color: #666;
}

.btn-outline:hover {
    background: #f5f5f5;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-sm {
    padding: 5px 10px;
    font-size: 12px;
}

/* 表格 */
.table {
    width: 100%;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border-collapse: collapse;
}

.table thead {
    background: #f8f9fa;
}

.table th,
.table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.table th {
    font-weight: 600;
    color: #555;
}

.table tbody tr:hover {
    background: #f8f9fa;
}

/* 搜索表单 */
.search-form {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.search-form input,
.search-form select {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    text-align: center;
}

.stat-card h3 {
    color: #7f8c8d;
    font-size: 14px;
    margin-bottom: 10px;
}

.stat-number {
    font-size: 32px;
    font-weight: bold;
    color: #2c3e50;
}

.stat-danger {
    color: #e74c3c;
}

/* 徽章 */
.badge {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.badge-优秀 {
    background: #27ae60;
    color: white;
}

.badge-良好 {
    background: #3498db;
    color: white;
}

.badge-中等 {
    background: #f39c12;
    color: white;
}

.badge-及格 {
    background: #e67e22;
    color: white;
}

.badge-不及格 {
    background: #e74c3c;
    color: white;
}

.badge-未知 {
    background: #95a5a6;
    color: white;
}

/* 提示消息 */
.alert {
    padding: 12px 20px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa8;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* 页面头部 */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    gap: 12px;
    flex-wrap: wrap;
}

.header-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

.io-bar {
    background: white;
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 16px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.06);
}

.import-form {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.import-form input[type="file"] {
    max-width: 320px;
}

/* 打印样式 */
@media print {
    .navbar,
    .footer,
    .no-print,
    .search-form,
    .alert {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
    }

    main.container {
        max-width: 100%;
        padding: 0;
    }

    .page-header h1 {
        margin-bottom: 12px;
    }

    .table {
        box-shadow: none;
    }

    .table th,
    .table td {
        border: 1px solid #333;
    }
}

/* 仪表盘区块 */
.dashboard-section {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.dashboard-section h2 {
    margin-bottom: 15px;
    color: #2c3e50;
    font-size: 18px;
}

/* 空消息 */
.empty-message {
    text-align: center;
    color: #95a5a6;
    padding: 40px;
    background: white;
    border-radius: 8px;
}

/* 页脚 */
.footer {
    background: #2c3e50;
    color: #95a5a6;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
}

/* 响应式 */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .navbar-menu {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .search-form {
        flex-direction: column;
    }
    
    .search-form input,
    .search-form select,
    .search-form button {
        width: 100%;
    }
    
    .table {
        font-size: 12px;
    }
    
    .table th,
    .table td {
        padding: 8px;
    }
}


/* 操作按钮行 */
.actions {
    display: inline-flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
}
.actions form {
    display: inline;
}