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

:root {
    --color-primary: #355C7D;
    --color-secondary: #6C5B7B;
    --color-accent: #C06C84;
    --color-warning: #F67280;
    --color-light: #F8B195;
    --color-white: #ffffff;
    --color-gray-100: #f8f9fa;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;
    --color-danger: #dc3545;
    --color-success: #28a745;
    
    --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 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);
    
    --transition-base: all 0.2s ease-in-out;
}

body {
    font-family: var(--font-family-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background: linear-gradient(135deg, var(--color-light) 0%, var(--color-white) 100%);
    min-height: 100vh;
}

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

/* Header */
.header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
    padding: var(--spacing-xl) 0;
    text-align: center;
    box-shadow: var(--shadow-md);
}

.header__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.header__icon {
    font-size: 2rem;
}

.header__subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    font-weight: 300;
}

/* Main */
.main {
    padding: var(--spacing-2xl) 0;
}

/* Cards */
.card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-gray-200);
}

.card__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Icons */
.icon {
    font-size: 1.2em;
}

/* Forms */
.form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form__row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.form__group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form__label {
    font-weight: 600;
    color: var(--color-gray-700);
    font-size: var(--font-size-sm);
}

.form__input,
.form__select {
    padding: var(--spacing-md);
    border: 2px solid var(--color-gray-300);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    transition: var(--transition-base);
    background-color: var(--color-white);
}

.form__input:focus,
.form__select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(53, 92, 125, 0.1);
}

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

.form__subtitle {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-secondary);
    margin: var(--spacing-lg) 0 var(--spacing-md) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-gray-200);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-base);
    min-height: 48px;
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn--primary:active {
    transform: translateY(0);
}

/* Results */
.results-section {
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results {
    display: grid;
    gap: var(--spacing-lg);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: var(--color-gray-100);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-gray-400);
}

.result-item--highlight {
    background: linear-gradient(135deg, var(--color-light), rgba(248, 177, 149, 0.3));
    border-left-color: var(--color-accent);
    font-weight: 600;
}

.result-item--warning {
    background: linear-gradient(135deg, var(--color-warning), rgba(246, 114, 128, 0.2));
    border-left-color: var(--color-danger);
    color: var(--color-danger);
}

.result-item__label {
    font-weight: 600;
    color: var(--color-gray-700);
}

.result-item__value {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-primary);
}

.result-item--warning .result-item__value {
    color: var(--color-danger);
}

/* Comparison */
.comparison {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--color-gray-100);
    border-radius: var(--border-radius);
}

.comparison__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.comparison__item {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.comparison__label {
    font-weight: 500;
    color: var(--color-gray-700);
}

.comparison__value {
    font-weight: 600;
    color: var(--color-primary);
}

.comparison__difference {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
}

.comparison__difference--positive {
    background: rgba(220, 53, 69, 0.1);
    color: var(--color-danger);
    border: 1px solid rgba(220, 53, 69, 0.2);
}

.comparison__difference--neutral {
    background: rgba(40, 167, 69, 0.1);
    color: var(--color-success);
    border: 1px solid rgba(40, 167, 69, 0.2);
}

/* Chart */
.chart-container {
    position: relative;
    width: 100%;
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* Resumo */
.resumo {
    display: grid;
    gap: var(--spacing-md);
}

.resumo__item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-gray-200);
}

.resumo__item:last-child {
    border-bottom: none;
}

.resumo__label {
    font-weight: 500;
    color: var(--color-gray-700);
}

.resumo__value {
    font-weight: 600;
    color: var(--color-primary);
}

/* FAQ */
.faq {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.faq__item {
    border: 1px solid var(--color-gray-200);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.faq__question {
    width: 100%;
    padding: var(--spacing-lg);
    background: var(--color-gray-100);
    border: none;
    text-align: left;
    font-weight: 600;
    color: var(--color-gray-800);
    cursor: pointer;
    transition: var(--transition-base);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq__question:hover {
    background: var(--color-gray-200);
}

.faq__question::after {
    content: '+';
    font-size: var(--font-size-xl);
    color: var(--color-primary);
    transition: var(--transition-base);
}

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

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

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

.faq__answer p {
    color: var(--color-gray-700);
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--color-gray-800);
    color: var(--color-white);
    padding: var(--spacing-xl) 0;
    text-align: center;
    margin-top: var(--spacing-2xl);
}

.footer__text {
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

.footer__link {
    color: var(--color-light);
    text-decoration: none;
    transition: var(--transition-base);
}

.footer__link:hover {
    color: var(--color-white);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .header {
        padding: var(--spacing-lg) 0;
    }
    
    .header__title {
        font-size: var(--font-size-2xl);
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .main {
        padding: var(--spacing-lg) 0;
    }
    
    .card {
        padding: var(--spacing-lg);
        margin-bottom: var(--spacing-lg);
    }
    
    .form__row {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
    
    .comparison__item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .chart-container {
        height: 250px;
    }
}

@media (max-width: 480px) {
    .header__title {
        font-size: var(--font-size-xl);
    }
    
    .card__title {
        font-size: var(--font-size-lg);
    }
    
    .btn {
        width: 100%;
    }
    
    .form__input,
    .form__select {
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

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

/* Focus styles for keyboard navigation */
.btn:focus,
.form__input:focus,
.form__select:focus,
.faq__question:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .card {
        border: 2px solid var(--color-gray-400);
    }
    
    .result-item {
        border: 1px solid var(--color-gray-400);
    }
}

/* Print styles */
@media print {
    .header,
    .footer,
    .faq-section {
        display: none;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--color-gray-400);
    }
    
    .btn {
        display: none;
    }
}