#quantum-intro-visual {
    margin: 40px 0;
    padding: 24px;
    border: 1px solid #2c3a58;
    border-radius: 14px;
    background: linear-gradient(180deg, #0d1320 0%, #111a2d 100%);
    color: #eef4ff;
}

#quantum-intro-visual h3 {
    margin-top: 0;
    margin-bottom: 20px;
    text-align: center;
    font-size: 1.6rem;
}

#quantum-intro-visual .qiv-wrapper {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

#quantum-intro-visual .qiv-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

#quantum-intro-visual .qiv-step {
    width: 46px;
    height: 46px;
    border: 1px solid #5b76b8;
    border-radius: 50%;
    background: #16233d;
    color: #eef4ff;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

#quantum-intro-visual .qiv-step:hover {
    transform: scale(1.06);
    background: #1b2c4c;
}

#quantum-intro-visual .qiv-step.active {
    background: #395ea8;
    border-color: #89a9f0;
}

#quantum-intro-visual .qiv-content {
    position: relative;
    min-height: 180px;
}

#quantum-intro-visual .qiv-panel {
    display: none;
    padding: 22px;
    border: 1px solid #314564;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.04);
}

#quantum-intro-visual .qiv-panel.active {
    display: block;
}

#quantum-intro-visual .qiv-panel h4 {
    margin-top: 0;
    margin-bottom: 12px;
    color: #ffffff;
    font-size: 1.25rem;
}

#quantum-intro-visual .qiv-panel p {
    margin: 0;
    line-height: 1.7;
    color: #dce6fb;
}

@media (max-width: 768px) {
    #quantum-intro-visual {
        padding: 18px;
    }

    #quantum-intro-visual .qiv-panel {
        padding: 18px;
    }

    #quantum-intro-visual h3 {
        font-size: 1.35rem;
    }
}