.contest-item .card{border:1px solid #eef2f6;border-radius:12px}
.contest-item .card:hover{box-shadow:0 .5rem 1rem rgba(0,0,0,.08)}
.contest-item .card-title{font-weight:600;margin-bottom:.25rem}
.contest-item .badge{border-radius:6px}
.contest-item .ratio{background:#f8f9fb}
.contest-item .contest-actions .btn{white-space:nowrap}
.contest-item .contest-meta{color:#6c757d;font-size:.9rem}
.contest-item .contest-meta .bi{margin-right:.25rem}
.contest-item .tag{display:inline-block;background:#f3f6ff;color:#3b82f6;border:1px solid #e5edff;border-radius:6px;padding:.1rem .4rem;margin-right:.25rem;font-size:.75rem}
.contest-item .organizer{font-size:.85rem;color:#6b7280}
/**
 * 竞赛模块样式
 * 支持北京时间统一管理和题目批量导入功能
 */

/* 时间显示样式 */
.time-beijing {
    color: #6c757d;
    font-size: 0.875rem;
}

.time-beijing::after {
    content: " (北京时间)";
    color: #6c757d;
    font-weight: normal;
}

/* 倒计时样式 */
.countdown {
    font-family: 'Courier New', monospace;
    font-weight: bold;
    color: #28a745;
}

.countdown.text-warning {
    color: #ffc107 !important;
    animation: pulse 1s infinite;
}

.countdown.text-danger {
    color: #dc3545 !important;
    animation: shake 0.5s infinite;
}

/* 脉冲动画 */
@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}

/* 震动动画 */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-2px); }
    75% { transform: translateX(2px); }
}

/* 导入方式选择样式 */
.import-type-option {
    border: 2px solid #e9ecef;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.import-type-option:hover {
    border-color: #007bff;
    background-color: #f8f9fa;
}

.import-type-option input[type="radio"]:checked + label {
    color: #007bff;
    font-weight: bold;
}

.import-type-option input[type="radio"]:checked ~ .import-type-option {
    border-color: #007bff;
    background-color: #e3f2fd;
}

/* 批量导入配置样式 */
#batchImportConfig {
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 1rem;
}

#batchImportConfig .form-select[multiple] {
    min-height: 120px;
}

/* 题目选择表格样式 */
.challenge-table {
    max-height: 400px;
    overflow-y: auto;
}

.challenge-table th {
    position: sticky;
    top: 0;
    background-color: #f8f9fa;
    z-index: 1;
}

.challenge-checkbox:checked + td {
    background-color: #e3f2fd;
}

/* 时间输入框样式 */
.datetime-local-input {
    position: relative;
}

.datetime-local-input::after {
    content: "北京时间（UTC+8）";
    position: absolute;
    bottom: -20px;
    left: 0;
    font-size: 0.75rem;
    color: #6c757d;
}

/* 竞赛状态样式 */
.contest-status {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.contest-status.ongoing {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.contest-status.published {
    background-color: #cce7ff;
    color: #004085;
    border: 1px solid #b3d9ff;
}

.contest-status.finished {
    background-color: #e2e3e5;
    color: #383d41;
    border: 1px solid #d6d8db;
}

.contest-status.draft {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.contest-status.cancelled {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* 题目难度标签样式 */
.difficulty-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
}

.difficulty-badge.easy {
    background-color: #d4edda;
    color: #155724;
}

.difficulty-badge.medium {
    background-color: #fff3cd;
    color: #856404;
}

.difficulty-badge.hard {
    background-color: #f8d7da;
    color: #721c24;
}

.difficulty-badge.expert {
    background-color: #343a40;
    color: #ffffff;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .challenge-table {
        font-size: 0.875rem;
    }
    
    .challenge-table th,
    .challenge-table td {
        padding: 0.5rem 0.25rem;
    }
    
    .import-type-option {
        padding: 0.75rem;
    }
    
    #batchImportConfig {
        padding: 1rem;
    }
}

/* 加载动画 */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #007bff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 工具提示样式 */
.tooltip-beijing {
    position: relative;
    cursor: help;
}

.tooltip-beijing::before {
    content: "所有时间均以北京时间为准（UTC+8）";
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: #333;
    color: #fff;
    padding: 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 1000;
}

.tooltip-beijing:hover::before {
    opacity: 1;
    visibility: visible;
}

/* 表单验证样式 */
.form-control.is-invalid {
    border-color: #dc3545;
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

.form-control.is-valid {
    border-color: #28a745;
    box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
}

.invalid-feedback {
    display: block;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: #dc3545;
}

.valid-feedback {
    display: block;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: #28a745;
}