.step-navigation {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 30px;
    margin: 40px 0;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.step-navigation h2 {
    color: #00bcd4;
    text-align: center;
}

.step-navigation ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 15px;
}

.step-navigation li {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.step-navigation li:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.step-navigation a {
    display: block;
    padding: 15px 20px;
    color: #ffffff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.step-navigation a:hover {
    color: #00bcd4;
}

.step {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    margin: 40px 0;
    padding: 40px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.step:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.step-header {
    display: flex;
    align-items: center;
    margin-bottom: 25px;
    gap: 20px;
}

.step-number {
    background: linear-gradient(135deg, #00bcd4, #0097a7);
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    box-shadow: 0 4px 15px rgba(0, 188, 212, 0.3);
}

.step h2 {
    margin-bottom: 0;
}

.description {
    font-size: 1.1rem;
    line-height: 1.7;
    color: #e0e0e0;
    margin-bottom: 30px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    border-left: 4px solid #00bcd4;
}

.step-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    justify-items: center;
}

.screenshot-container {
    position: relative;
    transition: transform 0.3s ease;
}

.screenshot-container:hover {
    transform: scale(1.05);
}

.screenshot {
    width: 100%;
    height: auto;
    cursor: pointer;
    transition: all 0.3s ease;
}

.screenshot:hover {
    border-color: #00bcd4;
}

.screenshot.enlarged {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(1.5);
    z-index: 1000;
    max-width: 90vw;
    max-height: 90vh;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
}

.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    z-index: 1000;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #00bcd4, #0097a7);
    width: 0%;
    transition: width 0.3s ease;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .step {
        padding: 25px;
        margin: 25px 0;
    }

    .step-header {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }

    .step h2 {
        font-size: 1.5rem;
    }

    .step-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .screenshot {
        max-width: 100%;
    }

    .step-navigation ul {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    #app-guide {
        padding: 20px 10px;
    }

    .step {
        padding: 20px;
    }

    .step-navigation {
        padding: 20px;
    }
}