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

:root {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #ec4899;
    --bg-color: #0f172a;
    --surface-color: #1e293b;
    --text-color: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --success-color: #10b981;
    --bg-gradient-start: #0f172a;
    --bg-gradient-end: #1a1f35;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --canvas-bg: #1e293b;
    --canvas-grid: #334155;
    --canvas-axis: #64748b;
}

/* Modo claro */
[data-theme="light"] {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --accent-color: #ec4899;
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --text-color: #0f172a;
    --text-secondary: #475569;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --bg-gradient-start: #f8fafc;
    --bg-gradient-end: #e0e7ff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --canvas-bg: #ffffff;
    --canvas-grid: #e2e8f0;
    --canvas-axis: #64748b;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    color: var(--text-color);
    min-height: 100vh;
    padding: 20px;
    transition: background 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
}

header {
    margin-bottom: 30px;
    padding: 30px;
    background: var(--surface-color);
    border-radius: 16px;
    box-shadow: 0 8px 32px var(--shadow-color);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 30px;
}

.header-text {
    flex: 1;
}

.header-text h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-text p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.header-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: flex-end;
    min-width: 300px;
}

.main-content {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin-bottom: 20px;
}

.signal-section {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 25px;
    align-items: start;
}

.signal-controls {
    background: var(--surface-color);
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 4px 16px var(--shadow-color);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.signal-visualization {
    background: var(--surface-color);
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 4px 16px var(--shadow-color);
    transition: background 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}

.signal-visualization h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
    color: var(--text-color);
}

.convolution-section {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 25px;
    align-items: start;
}

.convolution-controls {
    background: var(--surface-color);
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 4px 16px var(--shadow-color);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.convolution-visualizations {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.signal-controls h3,
.convolution-controls h3 {
    margin-bottom: 20px;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.control-group input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
    margin-bottom: 5px;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.5);
    transition: all 0.2s ease;
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.7);
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.5);
    transition: all 0.2s ease;
}

.control-group input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.7);
}

.control-group select {
    width: 100%;
    padding: 10px;
    background: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.control-group select:hover {
    border-color: var(--primary-color);
}

.control-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.control-group span {
    display: inline-block;
    min-width: 50px;
    padding: 4px 12px;
    background: var(--bg-color);
    border-radius: 6px;
    font-weight: 600;
    color: var(--primary-color);
    text-align: center;
}

.btn-primary {
    width: 100%;
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.5);
}

.btn-primary:active {
    transform: translateY(0);
}

.chart-container {
    background: var(--surface-color);
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 4px 16px var(--shadow-color);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.chart-container.product-view {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05), rgba(59, 130, 246, 0.05));
    border: 2px solid rgba(16, 185, 129, 0.2);
}

.chart-container.convolution-result {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(124, 58, 237, 0.05));
    border: 2px solid rgba(37, 99, 235, 0.2);
}

.info-label {
    margin-bottom: 10px;
    padding: 8px 12px;
    background: var(--bg-color);
    border-radius: 6px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.info-label strong {
    color: var(--primary-color);
    font-size: 1.1rem;
}

.control-group label:has(input[type="checkbox"]) {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.control-group label:not(:has(input)) {
    display: block;
}

.control-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.chart-container h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
    color: var(--text-color);
}

.chart-container canvas {
    width: 100%;
    height: 300px;
    display: block;
    border-radius: 8px;
}

.signal-visualization canvas {
    height: 350px;
    width: 100%;
    display: block;
    border-radius: 8px;
}

footer {
    background: var(--surface-color);
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 4px 16px var(--shadow-color);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.info-box h4 {
    margin-bottom: 12px;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.info-box p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 10px;
}

.info-box .formula {
    background: var(--bg-color);
    padding: 15px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    color: var(--primary-color);
    text-align: center;
    border-left: 4px solid var(--primary-color);
    margin: 15px 0;
}

/* Responsive design */
@media (max-width: 1200px) {
    .header-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .header-controls {
        align-items: center;
        min-width: auto;
    }
    
    .signal-section,
    .convolution-section {
        grid-template-columns: 1fr;
    }
    
    .signal-controls,
    .convolution-controls {
        order: 2;
    }
    
    .signal-visualization,
    .convolution-visualizations {
        order: 1;
    }
}

@media (max-width: 768px) {
    .header-text h1 {
        font-size: 1.8rem;
    }
    
    .header-text p {
        font-size: 0.95rem;
    }
    
    .header-controls {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }
    
    .theme-toggle-container,
    .discrete-toggle-container,
    .language-selector-container {
        margin-bottom: 0;
    }
    
    .signal-controls,
    .convolution-controls {
        padding: 20px;
    }
}

/* Theme toggle switch */
.theme-toggle-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 8px 12px;
    background: var(--bg-color);
    border-radius: 8px;
}

.theme-toggle-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.theme-toggle {
    position: relative;
    width: 60px;
    height: 30px;
}

.theme-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    transition: 0.4s;
    border-radius: 30px;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.theme-toggle-slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: 0.4s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.theme-toggle input:checked + .theme-toggle-slider {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
}

.theme-toggle input:checked + .theme-toggle-slider:before {
    transform: translateX(30px);
}

.theme-toggle-slider::after {
    content: '🌙';
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    transition: opacity 0.3s;
}

.theme-toggle input:checked + .theme-toggle-slider::after {
    content: '☀️';
    left: auto;
    right: 8px;
}

/* Discrete mode toggle switch */
.discrete-toggle-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 8px 12px;
    background: var(--bg-color);
    border-radius: 8px;
}

.discrete-toggle-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.discrete-toggle {
    position: relative;
    width: 60px;
    height: 30px;
}

.discrete-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.discrete-toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    transition: 0.4s;
    border-radius: 30px;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.discrete-toggle-slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: 0.4s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.discrete-toggle input:checked + .discrete-toggle-slider {
    background: linear-gradient(135deg, #10b981, #059669);
}

.discrete-toggle input:checked + .discrete-toggle-slider:before {
    transform: translateX(30px);
}

.discrete-toggle-slider::after {
    content: '∞';
    position: absolute;
    left: 8px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    font-weight: bold;
    transition: opacity 0.3s;
}

.discrete-toggle input:checked + .discrete-toggle-slider::after {
    content: '∑';
    left: auto;
    right: 8px;
}

/* Language selector */
.language-selector-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 8px 12px;
    background: var(--bg-color);
    border-radius: 8px;
}

.language-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.language-select {
    padding: 8px 12px;
    background: var(--surface-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 120px;
}

.language-select:hover {
    border-color: var(--primary-color);
}

.language-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}