/* 页面主背景 */
body {
    background: linear-gradient(135deg, #f8fffe 0%, #e8f5e8 50%, #d4f1d4 100%);
    background-attachment: fixed;
    position: relative;
}

/* 背景装饰元素 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(39, 174, 96, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(46, 204, 113, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(168, 230, 207, 0.08) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* 容器背景 */
.container {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(39, 174, 96, 0.1);
    margin-top: 20px;
    margin-bottom: 20px;
}

/* 头部背景 */
.header {
    background: linear-gradient(135deg, rgba(39, 174, 96, 0.05) 0%, rgba(168, 230, 207, 0.05) 100%);
    border-radius: 16px 16px 0 0;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 30% 20%, rgba(39, 174, 96, 0.1) 0%, transparent 40%),
        radial-gradient(circle at 70% 80%, rgba(46, 204, 113, 0.08) 0%, transparent 40%);
    pointer-events: none;
}

/* 热搜项目背景 */
.hot-item {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    position: relative;
    overflow: hidden;
}

.hot-item::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 60px;
    height: 100%;
    background: linear-gradient(90deg, transparent 0%, rgba(39, 174, 96, 0.02) 100%);
    pointer-events: none;
}

/* 前三名特殊背景效果 */
.hot-item:nth-child(1) {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.05) 0%, rgba(255, 255, 255, 0.95) 100%);
}

.hot-item:nth-child(2) {
    background: linear-gradient(135deg, rgba(243, 156, 18, 0.05) 0%, rgba(255, 255, 255, 0.95) 100%);
}

.hot-item:nth-child(3) {
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.05) 0%, rgba(255, 255, 255, 0.95) 100%);
}

/* 加载状态背景 */
.loading {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
    border-radius: 12px;
    margin: 20px;
}

/* 错误信息背景 */
.error-message {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.05) 0%, rgba(255, 255, 255, 0.9) 100%);
    backdrop-filter: blur(8px);
    border-radius: 12px;
    border: 1px solid rgba(231, 76, 60, 0.1);
    margin: 20px;
}

/* 底部背景 */
.footer {
    background: linear-gradient(135deg, rgba(39, 174, 96, 0.03) 0%, rgba(168, 230, 207, 0.03) 100%);
    border-radius: 0 0 16px 16px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(39, 174, 96, 0.3) 50%, transparent 100%);
}

/* 响应式背景调整 */
@media (max-width: 768px) {
    .container {
        margin-top: 10px;
        margin-bottom: 10px;
        border-radius: 12px;
    }
    
    .header {
        border-radius: 12px 12px 0 0;
    }
    
    .footer {
        border-radius: 0 0 12px 12px;
    }
    
    body::before {
        background-image: 
            radial-gradient(circle at 20% 80%, rgba(39, 174, 96, 0.03) 0%, transparent 40%),
            radial-gradient(circle at 80% 20%, rgba(46, 204, 113, 0.03) 0%, transparent 40%);
    }
}

@media (min-width: 1025px) {
    .container {
        margin-top: 40px;
        margin-bottom: 40px;
    }
    
    body::before {
        background-image: 
            radial-gradient(circle at 15% 85%, rgba(39, 174, 96, 0.06) 0%, transparent 60%),
            radial-gradient(circle at 85% 15%, rgba(46, 204, 113, 0.06) 0%, transparent 60%),
            radial-gradient(circle at 50% 50%, rgba(168, 230, 207, 0.04) 0%, transparent 70%);
    }
}

/* 动画效果 */
@keyframes backgroundShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* 悬浮时的背景变化 */
.hot-item:hover {
    background: rgba(255, 255, 255, 0.95);
}

.hot-item:hover::after {
    background: linear-gradient(90deg, transparent 0%, rgba(39, 174, 96, 0.05) 100%);
}

/* 排名背景渐变 */
.rank {
    position: relative;
    overflow: hidden;
}

.rank::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.2) 0%, transparent 100%);
    pointer-events: none;
}