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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
    position: relative;
}

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

header p {
    font-size: 1.2em;
    opacity: 0.9;
}

/* Language Selector */
.language-selector {
    position: absolute;
    top: 20px;
    right: 30px;
}

#language-select {
    background: rgba(255, 255, 255, 0.95);
    color: #667eea;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 0.95em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
}

#language-select:hover {
    background: white;
    border-color: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

#language-select:focus {
    border-color: white;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    padding: 30px;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }
    
    .language-selector {
        top: 15px;
        right: 15px;
    }
    
    #language-select {
        padding: 6px 10px;
        font-size: 0.85em;
    }
}

/* Panel Izquierdo */
.left-panel {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.left-panel h2,
.right-panel h2 {
    color: #667eea;
    font-size: 1.8em;
    margin-bottom: 20px;
    border-bottom: 3px solid #667eea;
    padding-bottom: 10px;
}

.slider-group {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.slider-group label {
    display: block;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
    font-size: 1.1em;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 10px;
}

input[type="range"] {
    flex: 1;
    height: 8px;
    border-radius: 5px;
    background: #ddd;
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #667eea;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    transition: all 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    background: #764ba2;
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #667eea;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    transition: all 0.2s;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
    background: #764ba2;
}

.value-display {
    min-width: 60px;
    text-align: right;
    font-weight: 600;
    color: #667eea;
    font-size: 1em;
}

.gradient-canvas {
    width: 100%;
    height: 40px;
    border-radius: 8px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Muestra de Color */
.color-display-section {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.color-display-section h3 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.3em;
}

.color-box {
    width: 100%;
    height: 150px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    margin-bottom: 15px;
    border: 3px solid #ddd;
}

.color-values {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.color-values p {
    font-family: 'Courier New', monospace;
    font-size: 1.1em;
    color: #333;
    background: white;
    padding: 10px;
    border-radius: 6px;
    border-left: 4px solid #667eea;
}

/* Gráfica de distribución espectral */
.spectrum-graph-container {
    margin-top: 20px;
}

.spectrum-graph-container h4 {
    color: #333;
    margin-bottom: 10px;
    font-size: 1em;
}

.spectrum-canvas {
    width: 100%;
    height: 120px;
    border-radius: 8px;
    background: white;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Coordenadas CIE */
.cie-coordinates {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.cie-coordinates h3 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.3em;
}

.coordinate-group {
    background: white;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 10px;
    border-left: 4px solid #667eea;
}

.coordinate-group h4 {
    color: #667eea;
    margin-bottom: 8px;
    font-size: 1.1em;
}

.coordinate-group p {
    font-family: 'Courier New', monospace;
    color: #333;
    font-size: 1em;
}

/* Panel Derecho */
.right-panel {
    display: flex;
    flex-direction: column;
}

.canvas-container {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

#cie-diagram {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.diagram-attribution {
    margin-top: 10px;
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 6px;
    font-size: 0.75em;
    color: #666;
    text-align: center;
}

.diagram-attribution p {
    margin: 0;
    line-height: 1.4;
}

.diagram-attribution a {
    color: #667eea;
    text-decoration: none;
    transition: color 0.2s;
}

.diagram-attribution a:hover {
    color: #764ba2;
    text-decoration: underline;
}

/* Leyenda */
.legend {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-top: 20px;
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95em;
    color: #333;
}

.legend-color {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    border: 2px solid #333;
}

.legend-color.srgb-color {
    background: transparent;
    border: 3px solid #0066FF;
}

.legend-color.adobergb-color {
    background: transparent;
    border: 3px solid #00AA00;
}

.legend-color.current-srgb {
    background: #0066FF;
    border-radius: 50%;
}

.legend-color.current-adobergb {
    background: #00AA00;
    border-radius: 50%;
}

/* Footer */
.app-footer {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px 20px;
    margin-top: 40px;
    text-align: center;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-attribution {
    font-size: 1.1em;
    margin-bottom: 15px;
}

.footer-attribution strong {
    font-size: 1.2em;
    color: #fff;
}

.footer-license {
    font-size: 0.95em;
    margin: 10px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 5px;
}

.footer-license a {
    color: white;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: opacity 0.3s;
}

.footer-license a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.footer-description {
    font-size: 0.9em;
    opacity: 0.9;
    margin-top: 10px;
    font-style: italic;
}