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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: #667eea;
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 20px;
    flex-wrap: wrap;
}

.nav-links a {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    padding: 8px 15px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.nav-links a:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

.nav-links a.active {
    background: #667eea;
    color: white;
}

/* 主内容区域 */
.main-content {
    padding: 50px 0;
}

/* 日期时间卡片 */
.datetime-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
    text-align: center;
}

.date-display {
    font-size: 2.5rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
}

.time-display {
    font-size: 4rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.weekday-display {
    font-size: 1.5rem;
    color: #666;
    font-weight: 500;
}

/* 节假日倒计时区域 */
.holidays-section {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.section-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 30px;
    text-align: center;
}

.holidays-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.holiday-card {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    transition: transform 0.3s ease;
}

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

.holiday-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.holiday-date {
    font-size: 0.9rem;
    color: #888;
    margin-bottom: 10px;
}

.holiday-countdown {
    font-size: 2rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 5px;
}

.holiday-unit {
    font-size: 0.9rem;
    color: #666;
}

/* 页脚样式 */
.footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 20px 0;
    text-align: center;
    margin-top: 50px;
}

.footer p {
    color: #666;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .nav-links {
        justify-content: center;
    }
    
    .time-display {
        font-size: 3rem;
    }
    
    .date-display {
        font-size: 2rem;
    }
    
    .datetime-card, .holidays-section {
        padding: 30px 20px;
    }
    
    .holidays-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .time-display {
        font-size: 2.5rem;
    }
    
    .date-display {
        font-size: 1.8rem;
    }
    
    .nav-links {
        gap: 10px;
    }
    
    .nav-links a {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
}