/* Calculator-specific styles */

/* Breadcrumb */
.breadcrumb {
    background: var(--surface);
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.breadcrumb ol {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    align-items: center;
    margin: 0;
    padding: 0;
}

.breadcrumb li {
    display: flex;
    align-items: center;
}

.breadcrumb li:not(:last-child)::after {
    content: '›';
    margin-left: 0.5rem;
    color: var(--text-secondary);
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
    color: var(--text-secondary);
}

/* Calculator Hero */
.calculator-hero {
    padding: 2rem 0;
    background: var(--surface);
    text-align: center;
}

.calculator-hero h1 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.calculator-hero p {
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.125rem;
}

/* Calculator Layout */
.calculator-section {
    padding: 3rem 0;
}

.calculator-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.calculator-panel,
.results-panel {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.calculator-panel h2,
.results-panel h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.5rem;
}

.calculator-panel h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.25rem;
}

/* Method Selector */
.method-selector {
    margin-bottom: 2rem;
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-primary);
}

.radio-label input[type="radio"] {
    display: none;
}

.radio-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: 50%;
    position: relative;
    transition: all 0.2s ease;
}

.radio-label input[type="radio"]:checked + .radio-custom {
    border-color: var(--primary-color);
}

.radio-label input[type="radio"]:checked + .radio-custom::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 10px;
    height: 10px;
    background: var(--primary-color);
    border-radius: 50%;
}

/* Data Input */
.data-input {
    margin-bottom: 2rem;
}

.input-help {
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.points-container {
    margin-bottom: 1rem;
}

.point-row {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    align-items: end;
}

.point-row label {
    display: flex;
    flex-direction: column;
}

.point-row input {
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

.point-row input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.point-row input:invalid {
    border-color: var(--error);
}

.remove-point {
    background: var(--error);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    width: 40px;
    height: 40px;
    cursor: pointer;
    font-size: 1.25rem;
    font-weight: bold;
    transition: background-color 0.2s ease;
}

.remove-point:hover:not(:disabled) {
    background: #dc2626;
}

.remove-point:disabled {
    background: var(--border);
    cursor: not-allowed;
    opacity: 0.5;
}

/* Interpolation Input */
.interpolation-input {
    margin-bottom: 2rem;
}

.interpolation-input label {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.interpolation-input span {
    font-weight: 500;
    color: var(--text-primary);
}

.interpolation-input input {
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

.interpolation-input input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Calculator Actions */
.calculator-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Results Panel */
.results-content {
    min-height: 200px;
    margin-bottom: 1.5rem;
}

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

.result-item {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    border-left: 4px solid var(--primary-color);
}

.result-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.result-method {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.result-equation {
    background: var(--background);
    padding: 1rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--text-primary);
    overflow-x: auto;
}

.error-message {
    background: #fef2f2;
    color: var(--error);
    padding: 1rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--error);
}

/* Results Actions */
.results-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Calculator Info */
.calculator-info {
    padding: 3rem 0;
    background: var(--surface);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.info-card {
    background: var(--background);
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
}

.info-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.info-card math {
    display: block;
    margin-top: 1rem;
    padding: 1rem;
    background: var(--surface);
    border-radius: 4px;
    text-align: center;
    overflow-x: auto;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Loading state */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .calculator-layout {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .calculator-panel,
    .results-panel {
        padding: 1.5rem;
    }
    
    .point-row {
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }
    
    .remove-point {
        grid-column: 1 / -1;
        justify-self: center;
        margin-top: 0.5rem;
    }
    
    .calculator-actions,
    .results-actions {
        flex-direction: column;
    }
    
    .radio-group {
        gap: 0.75rem;
    }
}

@media (max-width: 480px) {
    .calculator-hero {
        padding: 1.5rem 0;
    }
    
    .calculator-section {
        padding: 2rem 0;
    }
    
    .calculator-panel,
    .results-panel {
        padding: 1rem;
    }
    
    .point-row {
        grid-template-columns: 1fr;
    }
    
    .breadcrumb ol {
        font-size: 0.875rem;
    }
}