body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    transition: background-color 0.3s, color 0.3s;
}

header {
    background: #007BFF;
    color: white;
    padding: 4rem 1rem;
    text-align: center;
    position: relative;
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
}

header p {
    font-size: 1.2rem;
    opacity: 0.8;
}

main {
    max-width: 900px;
    margin: 2rem auto;
    padding: 1rem;
}

section {
    background: white;
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s, box-shadow 0.3s;
}

h2 {
    color: #007BFF;
    border-bottom: 2px solid #007BFF;
    padding-bottom: 0.5rem;
    margin-top: 0;
}

/* Frekans Jeneratörü Stilleri */
#frekans-deneyimi {
    text-align: center;
    padding: 3rem;
}

.freq-container {
    margin-top: 1.5rem;
    margin-bottom: 1.5rem;
}

#freq-slider {
    width: 80%;
    max-width: 500px;
    -webkit-appearance: none;
    height: 8px;
    background: #ddd;
    border-radius: 4px;
    outline: none;
}

#freq-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 25px;
    height: 25px;
    background: #007BFF;
    border-radius: 50%;
    cursor: pointer;
}

#freq-slider::-moz-range-thumb {
    width: 25px;
    height: 25px;
    background: #007BFF;
    border-radius: 50%;
    cursor: pointer;
}

#freq-display {
    margin-top: 1rem;
    font-size: 1.5rem;
    font-weight: 600;
    color: #007BFF;
}

#visualizer {
    background-color: #f0f0f0;
    border: 2px solid #ddd;
    border-radius: 10px;
    margin-top: 2rem;
    max-width: 100%;
}

.note-info {
    font-style: italic;
    color: #666;
    margin-top: 1rem;
}

/* Yeni eklenen uyarı metni stili */
#first-interaction-info {
    font-size: 1rem;
    font-style: italic;
    color: #007BFF;
    margin-top: 1rem;
    opacity: 1;
    transition: opacity 0.5s ease-in-out;
}

#first-interaction-info.hidden {
    opacity: 0;
}

/* Buton stilleri */
.controls {
    margin-top: 1.5rem;
}

#stop-button {
    padding: 0.75rem 2rem;
    font-size: 1rem;
    background-color: #FF4136;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#stop-button:hover {
    background-color: #E63946;
}

/* Frekans Listesi Stilleri */
#frekans-listesi ul {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
    justify-content: center;
}

#frekans-listesi ul li {
    margin: 0.5rem 1rem;
    font-weight: 500;
    color: #555;
}

footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 1rem;
}

.footer-content {
    max-width: 900px;
    margin: 0 auto;
}

footer a {
    color: #00BFFF;
    text-decoration: none;
    font-weight: bold;
}

footer p {
    margin: 0.5rem 0 0;
}

/* Responsive tasarım */
@media (max-width: 768px) {
    header {
        padding: 3rem 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    main {
        padding: 1rem 0.5rem;
    }

    section {
        padding: 1rem;
    }

    #frekans-listesi ul {
        flex-direction: column;
        align-items: center;
    }
}