/* 平台样式设计 */

/* 基础重置和通用样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: #f5f7fa;
    min-height: 100vh;
    color: #2c3e50;
    line-height: 1.6;
}

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

/* 头部样式 */
.header {
    text-align: center;
    margin-bottom: 35px;
    padding: 25px 0;
}

.header h1 {
    font-size: 2.2rem;
    margin-bottom: 8px;
    color: #34495e;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.header h1 i {
    margin-right: 12px;
    color: #e74c3c;
    font-size: 0.9em;
}

.header p {
    font-size: 1.1rem;
    color: #7f8c8d;
    font-weight: 400;
}

/* 搜索区域样式 */
.search-section {
    background: white;
    padding: 25px 28px;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    border: 1px solid #ecf0f1;
}

.search-box {
    display: flex;
    gap: 18px;
    margin-bottom: 22px;
    flex-wrap: wrap;
    align-items: center;
}

.search-input {
    flex: 1;
    min-width: 280px;
    padding: 14px 18px;
    border: 1px solid #d5dbdb;
    border-radius: 6px;
    font-size: 15px;
    outline: none;
    transition: border-color 0.2s ease;
    background: #fafbfc;
}

.search-input:focus {
    border-color: #3498db;
    background: white;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.1);
}

.filter-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-start;
}

.filter-btn {
    padding: 10px 18px;
    border: 1px solid #d5dbdb;
    border-radius: 5px;
    background: white;
    color: #5a6c7d;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 14px;
    font-weight: 500;
}

.filter-btn.active {
    background: #3498db;
    color: white;
    border-color: #3498db;
}

.filter-btn:hover:not(.active) {
    background: #f8f9fa;
    border-color: #bdc3c7;
}

/* 统计区域样式 */
.stats-section {
    background: white;
    padding: 28px;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    border: 1px solid #ecf0f1;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 18px;
}

.stat-item {
    text-align: center;
    padding: 22px 18px;
    background: #f8f9fa;
    border-radius: 6px;
    border: 1px solid #ecf0f1;
    position: relative;
}

.stat-item:nth-child(odd) {
    background: #f1f3f4;
}

.stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 6px;
}

.stat-label {
    color: #7f8c8d;
    font-size: 0.9rem;
    font-weight: 500;
}

/* 比赛网格样式 */
.contests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 18px;
    margin-bottom: 30px;
}

.contest-card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin: 5px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    transition: all 0.2s ease;
    border: 1px solid #ecf0f1;
    position: relative;
}

/* .contest-card:nth-child(3n+1) {
    border-left: 3px solid #3498db;
}

.contest-card:nth-child(3n+2) {
    border-left: 3px solid #e74c3c;
}

.contest-card:nth-child(3n+3) {
    border-left: 3px solid #f39c12;
} */

.contest-card:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.contest-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.platform-icon {
    width: 38px;
    height: 38px;
    border-radius: 6px;
    margin-right: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: white;
}

/* 平台特定颜色 */
.leetcode { background: #f39c12; }
.codeforces { background: #34495e; }
.atcoder { background: #e74c3c; }
.niuke { background: #27ae60; }
.default { background: #95a5a6; }

.contest-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 4px;
    line-height: 1.4;
}

.contest-platform {
    font-size: 0.85rem;
    color: #7f8c8d;
    font-weight: 500;
}

.contest-time {
    background: #f8f9fa;
    padding: 12px 14px;
    border-radius: 5px;
    margin: 12px 0;
    border: 1px solid #ecf0f1;
}

.time-label {
    font-size: 0.8rem;
    color: #7f8c8d;
    margin-bottom: 4px;
    font-weight: 500;
}

.time-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: #2c3e50;
}

.countdown {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    padding: 14px;
    border-radius: 6px;
    text-align: center;
    margin: 12px 0;
    position: relative;
    overflow: hidden;
}

.countdown::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.countdown-title {
    font-size: 0.8rem;
    margin-bottom: 6px;
    opacity: 0.9;
    font-weight: 500;
}

.countdown-time {
    font-size: 1.1rem;
    font-weight: 600;
}

.contest-status {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-upcoming {
    background: #e8f4fd;
    color: #2980b9;
    border: 1px solid #b3d9f2;
}

.status-ongoing {
    background: #e8f8f5;
    color: #27ae60;
    border: 1px solid #a8e6cf;
}

.status-system_test {
    background: #f8f9fa;
    color: #e74c3c;
    border: 1px solid #e74c3c;
}

.status-finished {
    background: #fdf2f2;
    color: #c0392b;
    border: 1px solid #f5b7b1;
}

.contest-link {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 18px;
    background: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.2s ease;
    text-align: center;
    width: 100%;
    font-size: 0.9rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
}

.contest-link:hover {
    background: #2980b9;
    transform: translateY(-1px);
    box-shadow: 0 3px 8px rgba(52, 152, 219, 0.3);
}

/* 页脚样式 */
.footer {
    text-align: center;
    color: #7f8c8d;
    margin-top: 40px;
    padding: 20px 0;
    border-top: 1px solid #ecf0f1;
    font-size: 0.9rem;
}

/* 加载和错误状态样式 */
.loading {
    text-align: center;
    padding: 40px;
    color: #7f8c8d;
    font-size: 1.1rem;
}

.loading i {
    margin-right: 8px;
    color: #3498db;
}

.error {
    background: white;
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    color: #e74c3c;
    margin-bottom: 30px;
    border: 1px solid #fadbd8;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 1.9rem;
    }
    
    .search-box {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-input {
        min-width: auto;
    }
    
    .contests-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .search-section,
    .stats-section {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.7rem;
    }
    
    .search-section,
    .stats-section {
        padding: 18px;
    }
    
    .contest-card {
        padding: 18px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}