/* CSS Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #6b7280;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --background-color: #f3f4f6;
    --card-background: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;
    --radius-sm: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #7c3aed 100%);
    color: white;
    padding: 2rem 1rem;
    text-align: center;
}

.header-content h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.header-content .subtitle {
    font-size: 1rem;
    opacity: 0.9;
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem;
    width: 100%;
}

/* Section Styles */
.section {
    background: var(--card-background);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Material Section */
.material-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.material-list-container h3,
.selected-materials-container h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.search-box {
    margin-bottom: 0.75rem;
}

.search-box input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.material-list {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.material-item {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.material-item:last-child {
    border-bottom: none;
}

.material-item:hover {
    background-color: var(--background-color);
}

.material-item.selected {
    background-color: rgba(79, 70, 229, 0.1);
    border-left: 3px solid var(--primary-color);
}

.material-item .material-name {
    font-weight: 500;
}

.material-item .material-category {
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: var(--background-color);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.selected-materials {
    min-height: 150px;
    max-height: 250px;
    overflow-y: auto;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    margin-bottom: 0.75rem;
}

.selected-material-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: 20px;
    margin: 0.25rem;
    font-size: 0.9rem;
}

.selected-material-tag .color-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.selected-material-tag .remove-btn {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.selected-material-tag .remove-btn:hover {
    opacity: 1;
}

.placeholder-text {
    color: var(--text-secondary);
    text-align: center;
    padding: 2rem;
    font-style: italic;
}

/* Custom Material Form */
.custom-material-form {
    background: var(--background-color);
    padding: 1.25rem;
    border-radius: var(--radius-sm);
}

.form-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.form-group {
    flex: 1;
    min-width: 150px;
}

.form-group.stc-group {
    flex: 0.5;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--card-background);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6370;
}

/* Frequency Section */
.frequency-controls {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.frequency-range-container {
    padding: 1rem;
    background: var(--background-color);
    border-radius: var(--radius-sm);
}

.range-labels {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--primary-color);
}

.dual-range-slider {
    position: relative;
    height: 40px;
}

.dual-range-slider input[type="range"] {
    position: absolute;
    width: 100%;
    height: 8px;
    background: transparent;
    pointer-events: none;
    -webkit-appearance: none;
    appearance: none;
}

.dual-range-slider input[type="range"]::-webkit-slider-runnable-track {
    height: 8px;
    background: linear-gradient(to right, var(--border-color), var(--primary-color), var(--border-color));
    border-radius: 4px;
}

.dual-range-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    pointer-events: auto;
    margin-top: -8px;
    box-shadow: var(--shadow);
    border: 3px solid white;
}

.dual-range-slider input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    pointer-events: auto;
    box-shadow: var(--shadow);
    border: 3px solid white;
}

.frequency-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

.preset-label {
    font-weight: 500;
    color: var(--text-secondary);
    margin-right: 0.5rem;
}

.preset-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.preset-btn:hover,
.preset-btn.active {
    background: var(--primary-color);
    color: white;
}

/* Graph Section */
.graph-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.graph-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding: 0.75rem;
    background: var(--background-color);
    border-radius: var(--radius-sm);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
}

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

.canvas-wrapper {
    position: relative;
    width: 100%;
    height: 400px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

#isolation-graph {
    width: 100%;
    height: 100%;
}

.graph-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 0.75rem;
    background: var(--background-color);
    border-radius: var(--radius-sm);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.legend-color {
    width: 20px;
    height: 4px;
    border-radius: 2px;
}

/* Comparison Section */
.comparison-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.comparison-card {
    background: var(--background-color);
    border-radius: var(--radius-sm);
    padding: 1.25rem;
    border-left: 4px solid var(--primary-color);
}

.comparison-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.comparison-stat {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.comparison-stat:last-child {
    border-bottom: none;
}

.comparison-stat .label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.comparison-stat .value {
    font-weight: 600;
    color: var(--text-primary);
}

.comparison-stat .value.excellent {
    color: var(--success-color);
}

.comparison-stat .value.good {
    color: #22c55e;
}

.comparison-stat .value.fair {
    color: var(--warning-color);
}

.comparison-stat .value.poor {
    color: var(--danger-color);
}

.performance-bar {
    margin-top: 1rem;
}

.performance-bar .bar-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
}

.performance-bar .bar-track {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.performance-bar .bar-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s ease;
}

/* Footer Styles */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 1.5rem;
    text-align: center;
    margin-top: auto;
}

.footer-content p {
    font-size: 0.95rem;
}

.footer-content a {
    color: #a5b4fc;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.footer-content a:hover {
    color: white;
    text-decoration: underline;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-primary);
}

/* Responsive Styles */
@media (max-width: 768px) {
    .header-content h1 {
        font-size: 1.5rem;
    }

    .material-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        flex-direction: column;
    }

    .form-group {
        min-width: 100%;
    }

    .form-group.stc-group {
        flex: 1;
    }

    .frequency-presets {
        flex-direction: column;
        align-items: flex-start;
    }

    .preset-label {
        margin-bottom: 0.5rem;
    }

    .graph-controls {
        flex-direction: column;
        gap: 0.75rem;
    }

    .canvas-wrapper {
        height: 300px;
    }

    .comparison-container {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 1rem;
    }

    .main-content {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 1.5rem 1rem;
    }

    .header-content h1 {
        font-size: 1.25rem;
    }

    .header-content .subtitle {
        font-size: 0.85rem;
    }

    .section h2 {
        font-size: 1.1rem;
    }

    .canvas-wrapper {
        height: 250px;
    }

    .selected-material-tag {
        font-size: 0.8rem;
        padding: 0.4rem 0.6rem;
    }
}

/* Animation for adding materials */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.selected-material-tag {
    animation: fadeIn 0.3s ease;
}

.comparison-card {
    animation: fadeIn 0.3s ease;
}

/* Toast notification styles */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: white;
    padding: 1rem 2rem;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--danger-color);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}