/* 内容区域布局 */
.content-container {
    margin-left: var(--nav-width);
    margin-top: var(--header-height);
    padding: 2.5rem;
    min-height: calc(100vh - var(--header-height));
    position: relative;
    z-index: 1;
    transform: translateZ(0);
}

/* 内容卡片样式 */
.content-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 2.5rem;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border-color);
    transition: transform 0.3s var(--transition-timing), opacity 0.3s var(--transition-timing), box-shadow 0.3s var(--transition-timing);
    margin-bottom: 2.5rem;
    transform-style: preserve-3d;
    perspective: 1000px;
    opacity: 1;
}

/* 增强卡片光效 */
.content-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent 25%,
        rgba(0, 180, 216, 0.1) 50%,
        transparent 75%
    );
    animation: cardGlow 6s infinite linear;
    z-index: -1;
}

.content-card:hover {
    /* 3D悬浮效果 */
    transform: translateY(-5px) rotateX(2deg) rotateY(2deg);
    box-shadow: 0 12px 40px rgba(0, 180, 216, 0.2);
    filter: brightness(1.05);
}

/* Content Display States */
.content {
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s var(--transition-timing),
                transform 0.3s var(--transition-timing);
}

.content.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
    animation: fadeIn 0.5s var(--transition-timing); /* 应用淡入动画 */
}