/* Reset e variáveis CSS */
:root {
    --primary-color: #1A535C;
    --secondary-color: #4ECDC4;
    --background-color: #F7FFF7;
    --danger-color: #FF6B6B;
    --warning-color: #FFE66D;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --border-color: #e0e6ed;
    --shadow: 0 2px 10px rgba(26, 83, 92, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem 0;
    box-shadow: var(--shadow);
}

.header__title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-align: center;
}

.header__subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    text-align: center;
    margin-bottom: 1.5rem;
}

.header__nav {
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.nav__link {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-weight: 500;
}

.nav__link:hover,
.nav__link--active {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Main content */
.main {
    flex: 1;
    padding: 3rem 0;
}

.section__title {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

/* Form styles */
.form-section {
    margin-bottom: 3rem;
}

.form-container {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.irpf-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.form-help {
    display: block;
    font-size: 0.85rem;
    color: var(--text-light);
    font-weight: 400;
    margin-top: 0.25rem;
}

.form-input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background-color: white;
}

.form-input:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(78, 205, 196, 0.1);
}

.form-input:invalid {
    border-color: var(--danger-color);
}

.form-fieldset {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.fieldset-legend {
    font-weight: 600;
    color: var(--primary-color);
    padding: 0 0.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn--primary {
    background-color: var(--primary-color);
    color: white;
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
}

.btn--primary:hover {
    background-color: #155158;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(26, 83, 92, 0.3);
}

/* Results section */
.results-section {
    margin-bottom: 3rem;
}

.comparison-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.comparison-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 2px solid transparent;
    transition: var(--transition);
}

.comparison-card--recommended {
    border-color: var(--secondary-color);
    position: relative;
}

.comparison-card--recommended::before {
    content: "Recomendado";
    position: absolute;
    top: -10px;
    right: 1rem;
    background-color: var(--secondary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius);
    font-size: 0.8rem;
    font-weight: 600;
}

.comparison-title {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.result-item:last-child {
    border-bottom: none;
    font-weight: 600;
    font-size: 1.1rem;
}

.result-label {
    color: var(--text-dark);
}

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

.result-value--positive {
    color: var(--secondary-color);
}

.result-value--negative {
    color: var(--danger-color);
}

.result-value--neutral {
    color: var(--text-dark);
}

/* Recommendation */
.recommendation {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    text-align: center;
}

.recommendation--complete {
    border-left: 4px solid var(--secondary-color);
}

.recommendation--simplified {
    border-left: 4px solid var(--warning-color);
}

.recommendation__title {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.recommendation__text {
    color: var(--text-light);
}

/* Calculation details */
.calculation-details {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.details-title {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.details-content {
    display: grid;
    gap: 1rem;
}

.detail-group {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1rem;
}

.detail-group__title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.detail-item {
    display: flex;
    justify-content: space-between;
    padding: 0.25rem 0;
}

/* Info section */
.info-section {
    margin-bottom: 2rem;
}

.info-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--warning-color);
}

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

.info-list {
    list-style: none;
    padding-left: 0;
}

.info-list li {
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.info-list li::before {
    content: "•";
    color: var(--warning-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: white;
    padding: 1.5rem 0;
    text-align: center;
    margin-top: auto;
}

.footer__text {
    font-size: 0.9rem;
    opacity: 0.9;
}
.footer_link {
    color: white;
    text-decoration: none;
}

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

.loading .btn--primary {
    position: relative;
}

.loading .btn--primary::after {
    content: "";
    position: absolute;
    width: 20px;
    height: 20px;
    margin: auto;
    border: 2px solid transparent;
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}

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

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .header__title {
        font-size: 2rem;
    }
    
    .header__nav {
        gap: 1rem;
    }
    
    .comparison-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .form-container {
        padding: 1.5rem;
    }
    
    .main {
        padding: 2rem 0;
    }
    
    .section__title {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 1.5rem 0;
    }
    
    .header__title {
        font-size: 1.8rem;
    }
    
    .header__subtitle {
        font-size: 1rem;
    }
    
    .form-container {
        padding: 1rem;
    }
    
    .comparison-card,
    .calculation-details,
    .info-card,
    .recommendation {
        padding: 1rem;
    }
    
    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }
    
    .detail-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }
}

/* Accessibility improvements */
@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 styles for better accessibility */
.form-input:focus,
.btn:focus,
.nav__link:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .header__nav,
    .btn,
    .info-section {
        display: none;
    }
    
    .header {
        background: white;
        color: var(--primary-color);
        box-shadow: none;
    }
    
    .comparison-card,
    .calculation-details,
    .recommendation {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
}