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

:root {
    --primary-color: #2c3e50;
    --primary-dark: #1a252f;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #2c3e50;
    --text-light: #6c757d;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --border-color: #e9ecef;
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 25px rgba(0, 0, 0, 0.1);
    --spacing-unit: 8px;
    --success-color: #27ae60;
    --warning-color: #f39c12;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text-color);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    background-attachment: fixed;
    line-height: 1.6;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

body > * {
    position: relative;
    z-index: 1;
}

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

/* 头部样式 */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #667eea 100%);
    background-size: 200% 200%;
    animation: gradientShift 15s ease infinite;
    color: white;
    padding: 40px 0;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
    border-radius: 0 0 15px 15px;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="20" height="20" patternUnits="userSpaceOnUse"><path d="M 20 0 L 0 0 0 20" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
    pointer-events: none;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

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

.logo a {
    color: white;
    text-decoration: none;
    font-size: 24px;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: transform 0.3s;
}

.logo a:hover {
    transform: scale(1.05);
}

.logo a i {
    font-size: 28px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.nav {
    display: flex;
    gap: 20px;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 10px 18px;
    border-radius: 8px;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

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

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.nav-link i {
    font-size: 16px;
}

/* 主内容区 */
.main {
    min-height: calc(100vh - 200px);
    padding: 40px 0;
}

/* 页脚 */
.footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    text-align: center;
    padding: 30px 0;
    margin-top: 60px;
    position: relative;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
}

/* 首页样式 */
.page-header {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 15px;
    box-shadow: var(--shadow);
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.page-header h1 i {
    margin-right: 10px;
}

/* 首页统计数字样式 */
.stats-box {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    padding: 20px 32px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.stats-number {
    font-size: 4.5rem;
    font-weight: 800;
    color: #ffffff;
    line-height: 1;
    text-align: center;
}

.stats-label {
    margin-top: 8px;
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.95);
    text-align: center;
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* 过滤区域 */
.filter-section {
    margin-bottom: 30px;
    padding: 20px;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.filter-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-btn {
    padding: 10px 20px;
    border: 2px solid var(--border-color);
    background: white;
    color: var(--text-color);
    border-radius: 25px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.filter-btn:hover {
    border-color: var(--secondary-color);
    color: var(--secondary-color);
    transform: translateY(-2px);
}

.filter-btn.active {
    background: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
}

.filter-btn i {
    font-size: 0.9rem;
}

.competition-card.hidden {
    display: none;
}

/* 竞赛卡片网格 */
.competitions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.competition-card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 1px solid var(--border-color);
}

.competition-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.card-header {
    margin-bottom: 20px;
}

.card-badges {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 10px;
}

.card-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 12px;
    line-height: 1.4;
}

.card-body {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 24px;
    font-size: 1rem;
}

.card-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 14px;
    font-size: 1rem;
    line-height: 1.6;
}

.card-item i {
    width: 20px;
    color: var(--secondary-color);
    margin-right: 10px;
    flex-shrink: 0;
}

.label {
    color: var(--text-light);
    font-weight: 500;
    min-width: 70px;
}

.value {
    color: var(--text-color);
    flex: 1;
}

.link {
    color: var(--primary-color);
    text-decoration: none;
    word-break: break-all;
}

.link:hover {
    text-decoration: underline;
}

/* 移除card-meta相关样式，因为不再显示参赛人数 */

.card-description {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* 徽章样式 */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

.badge-tag {
    background-color: var(--success-color);
    color: white;
}

.badge-whitelist {
    background-color: #e8f5e9;
    color: #2e7d32;
}

.badge-grade {
    color: white;
}

.badge-a {
    background-color: #f44336;
}

.badge-b {
    background-color: #ff9800;
}

.badge-c {
    background-color: #9e9e9e;
}

/* 赛道标签 */
.track-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 15px;
    margin-bottom: 10px;
}

.track-tag {
    background: var(--bg-color);
    color: var(--text-color);
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    border: 1px solid var(--border-color);
}

.difficulty-text {
    color: var(--text-color);
    font-weight: 500;
}

/* TAB页样式 */
.tabs-container {
    margin-top: 30px;
}

.tabs-nav {
    display: flex;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 24px;
    gap: 0;
    overflow-x: auto;
}

.tab-button {
    padding: 14px 24px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-light);
    transition: all 0.3s ease;
    white-space: nowrap;
    position: relative;
}

.tab-button:hover {
    color: var(--secondary-color);
    background: rgba(52, 152, 219, 0.05);
}

.tab-button.active {
    color: var(--secondary-color);
    border-bottom-color: var(--secondary-color);
    font-weight: 600;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

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

/* 详情页样式 */
.detail-header {
    margin-bottom: 32px;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.refresh-btn {
    padding: 10px 20px;
    background: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.refresh-btn:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.refresh-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.refresh-btn i.fa-spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.back-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    margin-bottom: 16px;
    font-size: 14px;
    transition: color 0.3s;
}

.back-link:hover {
    color: var(--primary-dark);
}

.detail-header h1 {
    font-size: 32px;
    color: var(--text-color);
}

.detail-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.detail-section {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

/* 手风琴样式 */
.accordion {
    width: 100%;
}

.accordion-toggle {
    display: none;
}

.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    background-color: #f8f9fa;
    cursor: pointer;
    user-select: none;
    transition: background-color 0.3s;
    font-weight: 600;
    font-size: 18px;
    color: var(--text-color);
}

.accordion-header:hover {
    background-color: #e9ecef;
}

.accordion-icon {
    transition: transform 0.3s;
    font-size: 14px;
    color: var(--text-light);
}

.accordion-toggle:checked ~ .accordion-header .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.accordion-toggle:checked ~ .accordion-content {
    max-height: 10000px;
    transition: max-height 0.5s ease-in;
}

.accordion-content > div {
    padding: 24px;
}

/* 信息网格 */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.info-item.full-width {
    grid-column: 1 / -1;
}

.info-label {
    font-weight: 600;
    color: var(--text-light);
    min-width: 100px;
    flex-shrink: 0;
}

.info-value {
    color: var(--text-color);
    flex: 1;
    word-break: break-word;
}

/* 内容块样式 */
.content-block {
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.content-block:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.content-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 12px;
}

.content-subtitle {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.content-text {
    color: var(--text-color);
    line-height: 1.8;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* 赛道样式 */
.track-block {
    margin-bottom: 32px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.track-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.subtracks {
    margin-top: 20px;
    padding-left: 20px;
    border-left: 2px solid var(--border-color);
}

.subtrack-block {
    margin-bottom: 16px;
    padding: 16px;
    background-color: white;
    border-radius: 6px;
}

.subtrack-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 8px;
}

.levels {
    margin-top: 20px;
}

.level-block {
    margin-bottom: 16px;
    padding: 16px;
    background-color: white;
    border-radius: 6px;
    border-left: 3px solid var(--secondary-color);
}

.level-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 8px;
}

/* 技能标签 */
.skills-list {
    margin-top: 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.skill-tag {
    display: inline-block;
    padding: 6px 12px;
    background-color: #e3f2fd;
    color: var(--primary-color);
    border-radius: 16px;
    font-size: 13px;
    font-weight: 500;
}

/* 无XML提示 */
.no-xml-notice {
    margin-top: 32px;
    padding: 24px;
    background-color: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: 8px;
    text-align: center;
    color: #856404;
}

/* 错误页 */
.error-page {
    text-align: center;
    padding: 60px 20px;
}

.error-page h1 {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.error-page p {
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 32px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    transition: background-color 0.3s;
}

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

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

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

/* XML对话框样式 */
.xml-dialog {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.xml-dialog-content {
    background: white;
    border-radius: 12px;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.xml-dialog-header {
    padding: 20px 25px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--primary-color);
    color: white;
    border-radius: 12px 12px 0 0;
}

.xml-dialog-header h3 {
    margin: 0;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.close-btn {
    background: none;
    border: none;
    color: white;
    font-size: 28px;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.3s;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.xml-dialog-body {
    padding: 25px;
    overflow-y: auto;
    flex: 1;
}

.dialog-message {
    background: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 20px;
}

.dialog-message p {
    margin: 0;
    color: #856404;
    font-weight: 500;
}

.prompt-section {
    margin-bottom: 20px;
}

.prompt-section label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
}

.prompt-textarea {
    width: 100%;
    min-height: 150px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    resize: vertical;
    margin-bottom: 10px;
}

.copy-btn {
    padding: 8px 16px;
    background: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

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

.xml-input-section {
    margin-bottom: 20px;
}

.xml-input-section label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
}

.xml-textarea {
    width: 100%;
    min-height: 300px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    resize: vertical;
}

.xml-dialog-footer {
    padding: 20px 25px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    background: #f8f9fa;
    border-radius: 0 0 12px 12px;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

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

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

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .competitions-grid {
        grid-template-columns: 1fr;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .header .container {
        flex-direction: column;
        gap: 16px;
    }
    
    .card-header {
        flex-direction: column;
    }
    
    .card-title {
        min-width: auto;
    }
    
    .header-top {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .xml-dialog-content {
        max-width: 100%;
        max-height: 95vh;
    }
    
    .xml-dialog-body {
        padding: 15px;
    }
}

/* 竞赛管理页面样式 */
.header-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 20px;
}

.header-info .btn-primary {
    font-size: 1.1rem;
    padding: 12px 24px;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: 10px;
}

.competitions-table {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.competitions-table table {
    width: 100%;
    border-collapse: collapse;
}

.competitions-table th {
    background: var(--primary-color);
    color: white;
    padding: 15px;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
}

.competitions-table td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
}

.competitions-table tr:hover {
    background: #f8f9fa;
}

.competitions-table tr:last-child td {
    border-bottom: none;
}

.competitions-table .empty {
    color: var(--text-light);
    font-style: italic;
}

.competitions-table .actions {
    display: flex;
    gap: 8px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-edit {
    background: var(--secondary-color);
    color: white;
}

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

.btn-delete {
    background: var(--accent-color);
    color: white;
}

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

/* 模态对话框样式 */
.modal-dialog {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-body {
    padding: 20px;
    flex: 1;
    overflow-y: auto;
}

.modal-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-control[type="text"],
.form-control[type="url"],
.form-control textarea,
.form-control select {
    font-family: inherit;
}

.form-control textarea {
    resize: vertical;
    min-height: 80px;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-light);
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.close-btn:hover {
    background: #f0f0f0;
    color: var(--text-color);
}

/* 响应式：竞赛管理页面 */
@media (max-width: 768px) {
    .header-info {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .competitions-table {
        overflow-x: auto;
    }
    
    .competitions-table table {
        min-width: 800px;
    }
    
    .modal-content {
        width: 95%;
        max-height: 95vh;
    }
    
    .competitions-table .actions {
        flex-direction: column;
    }
}