.developing-container {
    min-height: calc(100vh - 80px);
    /* 减去导航栏高度 */
    margin-top: 80px;
    /* 为导航栏留出空间 */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
    background: var(--bg-primary);
}

.developing-logo {
    width: 120px;
    height: 120px;
    margin-bottom: 2rem;
    animation: float 3s ease-in-out infinite;
}

.developing-text {
    max-width: 600px;
    margin: 1.5rem auto;
    line-height: 1.8;
    color: var(--text-primary);
    font-size: 1.2rem;
}

.feature-preview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
    max-width: 900px;
    width: 100%;
}

.feature-item {
    background: var(--bg-secondary);
    padding: 2rem;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    color: var(--text-primary);
    box-shadow: 0 4px 15px var(--card-shadow);
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
}

.feature-item i {
    font-size: 2rem;
    color: var(--accent-color);
}

.back-btn {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--accent-color);
    color: #fff;
    text-decoration: none;
    border-radius: 50px;
    margin-top: 2rem;
    transition: all 0.3s ease;
}

.back-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 102, 204, 0.3);
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

@keyframes softGradient {

    0%,
    100% {
        background-position: 0% 0%;
    }

    25% {
        background-position: 100% 0%;
    }

    50% {
        background-position: 100% 100%;
    }

    75% {
        background-position: 0% 100%;
    }
}

@media (max-width: 768px) {
    .developing-container {
        padding: 1rem;
    }

    .developing-logo {
        width: 100px;
        height: 100px;
    }

    .developing-text {
        font-size: 1.1rem;
    }

    .feature-preview {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}