/**
 * Fourier Series Visualization Styles
 * Scoped styles to prevent global pollution
 */

.fourier-series-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.fourier-series-container header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
}

.fourier-series-container h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.fourier-series-container .subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
    margin-bottom: 15px;
}

.fourier-series-container .formula {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 15px 30px;
    display: inline-block;
    margin-top: 10px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.fourier-series-container .math {
    font-family: 'Times New Roman', Times, serif;
    font-size: 1.3rem;
    font-style: italic;
    color: #fff;
    font-weight: 600;
}

.fourier-series-container main {
    background: white;
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.fourier-series-container .canvas-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

.fourier-series-container .canvas-wrapper {
    position: relative;
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.05);
}

.fourier-series-container canvas {
    display: block;
    margin: 0 auto;
    border-radius: 8px;
    background: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    cursor: crosshair;
}

.fourier-series-container .canvas-label {
    text-align: center;
    margin-top: 10px;
    font-size: 0.9rem;
    color: #6c757d;
    font-weight: 500;
}

.fourier-series-container .controls-section {
    display: grid;
    gap: 20px;
}

.fourier-series-container .control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.fourier-series-container label {
    font-weight: 600;
    color: #495057;
    font-size: 0.95rem;
}

.fourier-series-container select,
.fourier-series-container input[type="range"] {
    width: 100%;
    padding: 10px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.fourier-series-container select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.fourier-series-container input[type="range"] {
    height: 8px;
    padding: 0;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right, #667eea, #764ba2);
    border: none;
    border-radius: 4px;
}

.fourier-series-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: white;
    border: 3px solid #667eea;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s ease;
}

.fourier-series-container input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.fourier-series-container input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: white;
    border: 3px solid #667eea;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s ease;
}

.fourier-series-container input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.1);
}

.fourier-series-container .button-group {
    display: flex;
    gap: 15px;
    margin-top: 10px;
}

.fourier-series-container .btn {
    flex: 1;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.fourier-series-container .btn-secondary {
    background: #6c757d;
    color: white;
}

.fourier-series-container .btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.fourier-series-container .info-panel {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    margin-top: 20px;
    border: 2px solid #e9ecef;
}

.fourier-series-container .info-panel h3 {
    margin-top: 0;
    margin-bottom: 15px;
    color: #495057;
    font-size: 1.1rem;
}

.fourier-series-container .coefficients-display {
    max-height: 200px;
    overflow-y: auto;
}

.fourier-series-container .coefficients-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 10px;
}

.fourier-series-container .coefficient-item {
    background: white;
    padding: 10px;
    border-radius: 6px;
    border-left: 3px solid #667eea;
    font-size: 0.85rem;
    font-family: 'Courier New', monospace;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.fourier-series-container .coefficient-freq {
    color: #667eea;
    font-weight: 700;
}

.fourier-series-container .coefficient-amp {
    color: #764ba2;
    font-weight: 600;
}

.fourier-series-container .coefficient-phase {
    color: #6c757d;
    font-size: 0.8rem;
}

.fourier-series-container .explanation {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.fourier-series-container .explanation h2 {
    color: #495057;
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.fourier-series-container .explanation h3 {
    color: #667eea;
    margin-top: 30px;
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.fourier-series-container .explanation p {
    color: #6c757d;
    line-height: 1.8;
    margin-bottom: 15px;
    font-size: 1.05rem;
}

.fourier-series-container .explanation ul {
    list-style: none;
    padding-left: 0;
}

.fourier-series-container .explanation li {
    color: #6c757d;
    line-height: 1.8;
    margin-bottom: 12px;
    padding-left: 25px;
    position: relative;
    font-size: 1.05rem;
}

.fourier-series-container .explanation li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: 700;
}

.fourier-series-container .explanation ol {
    padding-left: 25px;
}

.fourier-series-container .explanation ol li {
    padding-left: 0;
    margin-bottom: 10px;
}

.fourier-series-container .explanation ol li::before {
    content: none;
}

.fourier-series-container .concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.fourier-series-container .concept-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 12px;
    padding: 20px;
    border-left: 4px solid #667eea;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.fourier-series-container .concept-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.fourier-series-container .concept-card h4 {
    color: #667eea;
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.fourier-series-container .concept-card p {
    color: #6c757d;
    line-height: 1.6;
    margin: 0;
    font-size: 0.95rem;
}

/* Responsive design */
@media (max-width: 1024px) {
    .fourier-series-container .canvas-section {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .fourier-series-container {
        padding: 15px;
    }

    .fourier-series-container h1 {
        font-size: 1.8rem;
    }

    .fourier-series-container main {
        padding: 20px;
    }

    .fourier-series-container .explanation {
        padding: 20px;
    }

    .fourier-series-container .concept-grid {
        grid-template-columns: 1fr;
    }

    .fourier-series-container .button-group {
        flex-direction: column;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}