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

:root {
    --color-primary: #1A1A2E;
    --color-secondary: #16213E;
    --color-tertiary: #0F3460;
    --color-accent: #E94560;
    --color-white: #FFFFFF;
    --color-gray-light: #F8F9FA;
    --color-gray-medium: #E9ECEF;
    --color-gray-dark: #6C757D;
    --color-success: #28A745;
    --color-warning: #FFC107;
    --color-error: #DC3545;
    
    --font-family-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    --font-size-xl: 24px;
    --font-size-xxl: 32px;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --box-shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.15);
    
    --transition: all 0.3s ease;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    line-height: 1.6;
    color: var(--color-primary);
    background-color: var(--color-gray-light);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.header__title {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.header__subtitle {
    font-size: var(--font-size-large);
    opacity: 0.9;
}

/* Main */
.main {
    padding: var(--spacing-xl) 0;
}

/* Calculator */
.calculator {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.calculator__form-container {
    min-width: 0;
}

.calculator__results {
    /* min-width: ; */
    display: none; ;
    
}

.calculator__results.show {
    display: block;
}

/* Form Styles */
.calculator__form {
    display: grid;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-label {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-secondary);
}

.form-input,
.form-select {
    padding: var(--spacing-sm);
    border: 2px solid var(--color-gray-medium);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    transition: var(--transition);
    background-color: var(--color-white);
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-tertiary);
    box-shadow: 0 0 0 3px rgba(15, 52, 96, 0.1);
}

.form-input.error,
.form-select.error {
    border-color: var(--color-error);
}

.error-message {
    color: var(--color-error);
    font-size: var(--font-size-small);
    margin-top: var(--spacing-xs);
    min-height: 1.2em;
}

/* Buttons */
.btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

.btn--primary:hover {
    background-color: #d63651;
    transform: translateY(-2px);
}

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

.btn--secondary:hover {
    background-color: #0a2a50;
    transform: translateY(-2px);
}

.form-actions {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

/* Results */
.results-summary {
    background: linear-gradient(135deg, var(--color-tertiary), var(--color-secondary));
    color: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-lg);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    /* padding: var(--spacing-sm) 0; */
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

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

.result-label {
    font-weight: 600;
}

.result-value {
    font-size: var(--font-size-large);
    font-weight: 700;
}

.result-value--highlight {
    color: var(--color-accent);
    font-size: var(--font-size-xl);
}

/* Chart */
.chart-container {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

#growthChart {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* Evolution Table */
.evolution-table-container {
    margin-bottom: var(--spacing-lg);
}

.evolution-table-container h3 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.table-wrapper {
    max-height: 400px;
    overflow-y: auto;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.evolution-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-white);
}

.evolution-table th,
.evolution-table td {
    padding: var(--spacing-sm);
    text-align: right;
    border-bottom: 1px solid var(--color-gray-medium);
}

.evolution-table th {
    background-color: var(--color-secondary);
    color: var(--color-white);
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 1;
}

.evolution-table td:first-child,
.evolution-table th:first-child {
    text-align: left;
}

.evolution-table tr:hover {
    background-color: var(--color-gray-light);
}

/* Export Actions */
.export-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

/* Saved Simulations */
.saved-simulations {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.saved-simulations h2 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.simulations-list {
    display: grid;
    gap: var(--spacing-md);
}

.simulation-item {
    background: var(--color-gray-light);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    border-left: 4px solid var(--color-accent);
}

.simulation-item h3 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
}

.simulation-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.simulation-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.btn--small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-small);
}

/* FAQ */
.faq {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.faq h2 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.faq__container {
    display: grid;
    gap: var(--spacing-sm);
}

.faq__item {
    border: 1px solid var(--color-gray-medium);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.faq__question {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--color-gray-light);
    border: none;
    text-align: left;
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.faq__question:hover {
    background-color: var(--color-gray-medium);
}

.faq__question[aria-expanded="true"] {
    background-color: var(--color-tertiary);
    color: var(--color-white);
}

.faq__icon {
    font-size: var(--font-size-large);
    font-weight: bold;
    transition: var(--transition);
}

.faq__question[aria-expanded="true"] .faq__icon {
    transform: rotate(45deg);
}

.faq__answer {
    padding: 0 var(--spacing-md);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq__answer.show {
    padding: var(--spacing-md);
    max-height: 200px;
}

.faq__answer p {
    color: var(--color-gray-dark);
    line-height: 1.6;
}

/* Footer */
.footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-lg) 0;
    text-align: center;
}
.footer__link {
    color: var(--light-color);
    text-decoration: none;
    transition: var(--transition);
}

.footer__text {
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .calculator {
        grid-template-columns: 1fr;
        padding: var(--spacing-lg);
    }
    
    .form-actions {
        grid-template-columns: 1fr;
    }
    
    .export-actions {
        flex-direction: column;
    }
    
    .simulation-details {
        grid-template-columns: 1fr;
    }
    
    .simulation-actions {
        flex-direction: column;
    }
    
    .header__title {
        font-size: var(--font-size-xl);
    }
    
    .container {
        padding: 0 var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    .calculator {
        padding: var(--spacing-md);
    }
    
    .evolution-table th,
    .evolution-table td {
        padding: var(--spacing-xs);
        font-size: var(--font-size-small);
    }
    
    .btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-small);
    }
}

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

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--color-gray-medium);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.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;
}

/* Focus indicators */
.btn:focus,
.form-input:focus,
.form-select:focus,
.faq__question:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-gray-medium: #000000;
        --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    }
}

.chart-container canvas {
    width: 100% !important;
    max-width: 100%;
    display: block;
}