:root {
    --bg-primary: #1a202c;
    --bg-secondary: #2d3748;
    --text-primary: #e2e8f0;
    --text-secondary: #a0aec0;
    --accent: #4299e1;
    --accent-variant: #3182ce;
    --accent-shadow: rgba(66, 153, 225, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #2d3748 100%);
}

.container {
    background-color: var(--bg-secondary);
    border-radius: 16px;
    padding: 30px;
    width: 100%;
    max-width: 600px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    border: 1px solid var(--accent);
}

.header {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    gap: 15px;
}

.header h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    text-shadow: 0 0 10px var(--accent-shadow);
}

.logo-icon {
    width: 50px;
    height: 50px;
    color: var(--accent);
    filter: drop-shadow(0 0 5px var(--accent-shadow));
}

.drop-zone {
    border: 2px dashed var(--accent);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    transition: background-color 0.3s ease;
}

.drop-zone.drag-over {
    background-color: rgba(66, 153, 225, 0.1);
}

.drop-zone input {
    display: none;
}

.drop-zone-label {
    cursor: pointer;
    color: var(--accent);
}

.preview {
    max-width: 100px;
    height: auto;
    margin: 5px auto;
    border-radius: 12px;
}

.controls {
    display: grid;
    gap: 15px;
    margin-top: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

input[type="number"], input[type="range"] {
    width: 100%;
    padding: 10px;
    background-color: var(--bg-primary);
    border: 1px solid var(--accent);
    color: var(--text-primary);
    border-radius: 8px;
}

.dimension-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.btn {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    text-shadow: 0 0 10px var(--accent-shadow);
}

footer {
    font-size: 12px;
    padding: 25px 0 0 0;
    text-align: center;
    color: var(--text-secondary);
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

.btn:hover {
    background-color: var(--accent-variant);
}

.btn:disabled {
    background-color: #4a5568;
    cursor: not-allowed;
}

#compressionQuality {
    width: 100%;
    padding: 0;
}

.quality-label {
    display: flex;
    justify-content: space-between;
    margin-top: 5px;
    color: var(--text-secondary);
}

/* Additional styling to match the more modern, subdued look */
label {
    color: var(--text-secondary);
    font-size: 14px;
}

#pngCompressionOptions select, #noiseReduction select {
    width: 100%;
    padding: 10px;
    background-color: var(--bg-primary);
    border: 1px solid var(--accent);
    color: var(--text-primary);
    border-radius: 8px;
}

.preview-container {
    margin-top: 20px;
    text-align: center;
}

.result-preview {
    max-width: 100%;
    max-height: 300px;
    border: 1px solid #ddd;
    margin-top: 10px;
}

.transparency-label, .quality-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.8em;
    color: #666;
    margin-top: 5px;
}