:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --accent: #ff4757; /* Color estilo Redot */
    --text: #ffffff;
    --secondary-text: #b3b3b3;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

.container {
    width: 90%;
    max-width: 1000px;
    margin-top: 40px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

header h1 span {
    color: var(--accent);
    font-size: 1rem;
    vertical-align: middle;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.control-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
}

.upload-zone {
    border: 2px dashed #444;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 250px;
    cursor: pointer;
    transition: all 0.3s;
    overflow: hidden;
}

.upload-zone:hover {
    border-color: var(--accent);
    background: #252525;
}

.upload-zone img {
    max-width: 100%;
    max-height: 250px;
    object-fit: contain;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

select, button {
    padding: 12px;
    border-radius: 6px;
    border: 1px solid #444;
    background: #2c2c2c;
    color: white;
    font-size: 1rem;
}

button#btn-generate {
    background: var(--accent);
    border: none;
    font-weight: bold;
    cursor: pointer;
    margin-top: auto;
    transition: opacity 0.2s;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.results-area {
    margin-top: 30px;
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
}

.sprites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.sprite-card {
    background: #121212;
    padding: 10px;
    border-radius: 8px;
    text-align: center;
}

.sprite-card img {
    width: 64px; /* Tamaño típico de sprite */
    height: 64px;
    image-rendering: pixelated; /* Crucial para pixel art */
}

.hidden { display: none !important; }

@media (max-width: 768px) {
    .control-panel { grid-template-columns: 1fr; }
}