:root {
    --primary-bg: #1a1a2e;
    --secondary-bg: #16213e;
    --tertiary-bg: #0f3460;
    --accent-color: #e94560;
    --text-color: #dcdcdc;
    --light-text: #a4a4a4;
    --glow-color: rgba(233, 69, 96, 0.5);
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--primary-bg);
    background-image: url('background.png');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--text-color);
    margin: 0;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    box-sizing: border-box;
}

#app-container {
    width: 100%;
    max-width: 600px;
    background-color: rgba(22, 33, 62, 0.85);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    padding: 2rem;
    text-align: center;
}

header h1 {
    color: white;
    font-weight: 700;
    margin: 0;
    font-size: 2.5rem;
    letter-spacing: 2px;
}

header p {
    color: var(--accent-color);
    font-weight: 300;
    margin: 0 0 2rem 0;
    font-size: 1.2rem;
}

#upload-area {
    margin-bottom: 2rem;
}

#upload-label {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    border: 2px dashed var(--tertiary-bg);
    border-radius: 15px;
    cursor: pointer;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

#upload-label:hover, #upload-label.dragover {
    background-color: var(--tertiary-bg);
    border-color: var(--accent-color);
}

#upload-label img {
    margin-bottom: 1rem;
    transition: transform 0.3s ease;
}

#upload-label:hover img {
    transform: scale(1.1) translateY(-5px);
}

#file-name-display {
    margin-top: 1rem;
    color: var(--accent-color);
    font-weight: bold;
    min-height: 1.2em;
}

.control-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.control-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 400;
    color: var(--light-text);
}

select, input[type="range"] {
    width: 100%;
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid var(--tertiary-bg);
    background-color: var(--primary-bg);
    color: var(--text-color);
    font-size: 1rem;
    box-sizing: border-box;
}

select {
    cursor: pointer;
}

input[type="range"] {
    padding: 0;
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
    background: var(--tertiary-bg);
    height: 8px;
    border-radius: 4px;
}

input[type="range"]::-moz-range-track {
    background: var(--tertiary-bg);
    height: 8px;
    border-radius: 4px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    margin-top: -6px;
    background-color: var(--accent-color);
    height: 20px;
    width: 20px;
    border-radius: 50%;
    box-shadow: 0 0 10px var(--glow-color);
}

input[type="range"]::-moz-range-thumb {
    border: none;
    border-radius: 50%;
    background-color: var(--accent-color);
    height: 20px;
    width: 20px;
    box-shadow: 0 0 10px var(--glow-color);
}


#convert-btn {
    width: 100%;
    padding: 1rem;
    font-size: 1.2rem;
    font-weight: 700;
    color: white;
    background-color: var(--accent-color);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

#convert-btn:hover {
    background-color: #ff5c7c;
}

#convert-btn:active {
    transform: scale(0.98);
}

#convert-btn:disabled {
    background-color: #555;
    cursor: not-allowed;
    opacity: 0.7;
}

#status-area {
    margin-top: 1.5rem;
    min-height: 2em;
    font-size: 1.1rem;
}

#results-area {
    margin-top: 2rem;
    display: flex;
    gap: 2rem;
    justify-content: space-around;
}

#results-area.hidden {
    display: none;
}

.audio-player {
    flex: 1;
}

.audio-player h3 {
    color: white;
    margin-bottom: 0.5rem;
}

audio {
    width: 100%;
}

footer {
    margin-top: 2rem;
    font-size: 0.9rem;
    color: var(--light-text);
}