/* USP优势区域样式 */
#usp-section {
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.usp-header {
    text-align: left;
    margin-bottom: 60px;
}

.usp-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.usp-item {
    position: relative;
    padding: 30px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.usp-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.usp-number {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    opacity: 0.5;
}

.usp-title {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--light-text);
}

.usp-description {
    font-size: 16px;
    color: var(--light-text);
    opacity: 0.8;
}

/* 淡入动画 */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 992px) {
    #usp-section {
        padding: 80px 0;
    }
    
    .usp-title {
        font-size: 20px;
    }
    
    .usp-description {
        font-size: 14px;
    }
}

@media (max-width: 768px) {
    .usp-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .usp-header {
        text-align: center;
    }
}

@media (max-width: 576px) {
    #usp-section {
        padding: 60px 0;
    }
    
    .usp-item {
        padding: 20px;
    }
    
    .usp-number {
        font-size: 28px;
    }
}