.modern-nav {
    position: fixed;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
    padding: 15px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.modern-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.modern-nav li {
    margin: 10px 0;
}

.modern-nav .nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 180px;
    min-height: 60px;
    padding: 10px 20px;
    border: 2px solid #1d4573;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.9);
    color: #191d40;
    text-decoration: none;
    font-weight: bold;
    font-size: 14px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.modern-nav .nav-btn:hover {
    background: #1d4573;
    color: #fff;
    transform: translateX(5px);
    box-shadow: 0 4px 15px rgba(29, 69, 115, 0.2);
}

.modern-nav .nav-btn.active {
    background: #1d4573;
    color: #a8f843;
    box-shadow: 0 4px 15px rgba(29, 69, 115, 0.3);
}

/* 添加响应式设计 */
@media (max-width: 768px) {
    .modern-nav {
        position: sticky;
        top: 0;
        left: 0;
        width: 100%;
        transform: none;
        border-radius: 0;
        padding: 10px;
        background: rgba(255, 255, 255, 0.95);
    }

    .modern-nav ul {
        display: flex;
        justify-content: center;
        flex-wrap: wrap;
        gap: 10px;
    }

    .modern-nav li {
        margin: 0;
    }

    .modern-nav .nav-btn {
        width: auto;
        min-height: 50px;
        font-size: 12px;
    }

}