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

:root {
    /* Paleta de Cores */
    --color-primary: #E4C1F9;
    --color-secondary: #F6DFEB;
    --color-accent: #D0F4DE;
    --color-warning: #FCF6BD;
    --color-danger: #FFB7C5;
    
    /* Gradientes */
    --gradient-primary: linear-gradient(135deg, #E4C1F9 0%, #F6DFEB 100%);
    --gradient-secondary: linear-gradient(135deg, #D0F4DE 0%, #FCF6BD 100%);
    --gradient-accent: linear-gradient(135deg, #FCF6BD 0%, #FFB7C5 100%);
    --gradient-dark: linear-gradient(135deg, #8B5CF6 0%, #EC4899 100%);
    
    /* Tipografia */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-xs: 0.75rem;
    --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;
    
    /* Espaçamento */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Sombras */
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Bordas */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    /* Transições */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: #374151;
    background: var(--gradient-primary);
    min-height: 100vh;
}

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

/* Header */
.header {
    background: var(--gradient-dark);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.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-sm);
}

.header__icon {
    font-size: 2rem;
}

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

/* Navigation */
.nav {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav .container {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.nav__btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--gradient-secondary);
    border: none;
    border-radius: var(--border-radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: #374151;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.nav__btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav__icon {
    font-size: var(--font-size-base);
}

/* Main */
.main {
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - 200px);
}

/* Calculator */
.calculator {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    margin-bottom: var(--spacing-xl);
}

.calculator__header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.calculator__title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: #1f2937;
    margin-bottom: var(--spacing-sm);
}

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

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

.form-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: #374151;
}

.form-label__text {
    font-size: var(--font-size-sm);
}

.form-label__required {
    color: #ef4444;
    font-weight: 600;
}

.form-label__optional {
    color: #6b7280;
    font-size: var(--font-size-xs);
    font-style: italic;
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid #e5e7eb;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
    background: white;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: #8b5cf6;
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.form-input.error,
.form-select.error {
    border-color: #ef4444;
}

.form-error {
    color: #ef4444;
    font-size: var(--font-size-xs);
    margin-top: var(--spacing-xs);
    min-height: 1rem;
}

/* Form Actions */
.form-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    min-width: 120px;
}

.btn--primary {
    background: var(--gradient-dark);
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn--secondary {
    background: var(--gradient-secondary);
    color: #374151;
    box-shadow: var(--shadow-sm);
}

.btn--secondary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn--danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn--danger:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn__icon {
    font-size: var(--font-size-lg);
}

/* Results */
.results {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    position: relative;
}

.results__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid #e5e7eb;
}

.results__title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: #1f2937;
}

.results__close {
    background: none;
    border: none;
    font-size: 2rem;
    color: #6b7280;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.results__close:hover {
    background: #f3f4f6;
    color: #374151;
}

.results__content {
    margin-bottom: var(--spacing-xl);
}

.results__actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    padding-top: var(--spacing-md);
    border-top: 2px solid #e5e7eb;
}

/* Result Cards */
.result-card {
    background: var(--gradient-accent);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.result-card__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: #1f2937;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.result-item:last-child {
    border-bottom: none;
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.result-item__label {
    color: #374151;
}

.result-item__value {
    font-weight: 500;
    color: #1f2937;
}

.result-item__value--positive {
    color: #059669;
}

.result-item__value--negative {
    color: #dc2626;
}

.result-item__value--warning {
    color: #d97706;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal__content {
    position: relative;
    background: white;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 90vw;
    max-height: 90vh;
    width: 600px;
    overflow: hidden;
    transform: scale(0.9);
    transition: transform var(--transition-normal);
}

.modal.active .modal__content {
    transform: scale(1);
}

.modal__content--large {
    width: 800px;
}

.modal__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl);
    border-bottom: 1px solid #e5e7eb;
    background: var(--gradient-primary);
}

.modal__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: #1f2937;
}

.modal__close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #6b7280;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.modal__close:hover {
    background: rgba(0, 0, 0, 0.1);
    color: #374151;
}

.modal__body {
    padding: var(--spacing-xl);
    max-height: 60vh;
    overflow-y: auto;
}

/* Instructions */
.instructions__section {
    margin-bottom: var(--spacing-xl);
}

.instructions__section h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: #1f2937;
    margin-bottom: var(--spacing-md);
}

.instructions__section h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: #374151;
    margin: var(--spacing-md) 0 var(--spacing-sm) 0;
}

.instructions__section ol,
.instructions__section ul {
    padding-left: var(--spacing-lg);
}

.instructions__section li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.regime-info {
    background: var(--gradient-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    margin-top: var(--spacing-md);
}

/* Offcanvas */
.offcanvas {
    position: fixed;
    top: 0;
    right: -100%;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    z-index: 1000;
    transition: right var(--transition-normal);
}

.offcanvas.active {
    right: 0;
}

.offcanvas__overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.offcanvas.active .offcanvas__overlay {
    opacity: 1;
    visibility: visible;
}

.offcanvas__content {
    position: relative;
    background: white;
    height: 100%;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
}

.offcanvas__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl);
    border-bottom: 1px solid #e5e7eb;
    background: var(--gradient-primary);
}

.offcanvas__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: #1f2937;
}

.offcanvas__close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #6b7280;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.offcanvas__close:hover {
    background: rgba(0, 0, 0, 0.1);
    color: #374151;
}

.offcanvas__body {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.offcanvas__footer {
    padding: var(--spacing-lg);
    border-top: 1px solid #e5e7eb;
    background: #f9fafb;
}

/* History */
.history-empty {
    text-align: center;
    color: #6b7280;
    padding: var(--spacing-2xl) 0;
}

.history-item {
    background: var(--gradient-secondary);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.history-item__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.history-item__date {
    font-size: var(--font-size-xs);
    color: #6b7280;
}

.history-item__delete {
    background: none;
    border: none;
    color: #ef4444;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.history-item__delete:hover {
    background: rgba(239, 68, 68, 0.1);
}

.history-item__content {
    display: grid;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.history-item__row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-item__label {
    color: #374151;
}

.history-item__value {
    font-weight: 500;
    color: #1f2937;
}

/* FAQ */
.faq__item {
    border-bottom: 1px solid #e5e7eb;
    margin-bottom: var(--spacing-md);
}

.faq__question {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: var(--spacing-md) 0;
    font-size: var(--font-size-base);
    font-weight: 500;
    color: #1f2937;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color var(--transition-fast);
}

.faq__question:hover {
    color: #8b5cf6;
}

.faq__question::after {
    content: '+';
    font-size: var(--font-size-xl);
    font-weight: 300;
    transition: transform var(--transition-fast);
}

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

.faq__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

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

.faq__answer p {
    color: #6b7280;
    line-height: 1.6;
}

/* Loading */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.loading__spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #e5e7eb;
    border-top: 4px solid #8b5cf6;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading__text {
    margin-top: var(--spacing-md);
    color: #6b7280;
    font-weight: 500;
}

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

/* Toast */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: white;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    z-index: 3000;
    max-width: 300px;
}

.toast.active {
    transform: translateX(0);
}

.toast__content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
}

.toast__icon {
    font-size: var(--font-size-lg);
}

.toast__message {
    font-size: var(--font-size-sm);
    color: #374151;
}

.toast__close {
    background: none;
    border: none;
    color: #6b7280;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.toast__close:hover {
    background: #f3f4f6;
    color: #374151;
}

.toast--success {
    border-left: 4px solid #10b981;
}

.toast--error {
    border-left: 4px solid #ef4444;
}

.toast--warning {
    border-left: 4px solid #f59e0b;
}

.toast--info {
    border-left: 4px solid #3b82f6;
}

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

.footer__text {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.footer__link {
    color: white;
    text-decoration: underline;
    transition: opacity var(--transition-fast);
}

.footer__link:hover {
    opacity: 0.8;
}

/* 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-xs);
    }
    
    .header__subtitle {
        font-size: var(--font-size-base);
    }
    
    .nav .container {
        gap: var(--spacing-sm);
    }
    
    .nav__btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: var(--font-size-xs);
    }
    
    .main {
        padding: var(--spacing-lg) 0;
    }
    
    .calculator,
    .results {
        padding: var(--spacing-lg);
    }
    
    .calculator__title,
    .results__title {
        font-size: var(--font-size-xl);
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        min-width: auto;
    }
    
    .results__header {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .results__actions {
        flex-direction: column;
    }
    
    .modal__content {
        width: 95vw;
        margin: var(--spacing-md);
    }
    
    .modal__content--large {
        width: 95vw;
    }
    
    .modal__header,
    .modal__body {
        padding: var(--spacing-md);
    }
    
    .offcanvas {
        max-width: 100vw;
    }
    
    .offcanvas__header,
    .offcanvas__body,
    .offcanvas__footer {
        padding: var(--spacing-md);
    }
    
    .toast {
        right: var(--spacing-sm);
        left: var(--spacing-sm);
        max-width: none;
    }
    
    .result-card {
        padding: var(--spacing-md);
    }
    
    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    .header__title {
        font-size: var(--font-size-xl);
    }
    
    .calculator,
    .results {
        padding: var(--spacing-md);
    }
    
    .form-input,
    .form-select {
        padding: var(--spacing-sm);
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .modal__header,
    .modal__body {
        padding: var(--spacing-sm);
    }
    
    .offcanvas__header,
    .offcanvas__body,
    .offcanvas__footer {
        padding: var(--spacing-sm);
    }
}

/* Print Styles */
@media print {
    .nav,
    .modal,
    .offcanvas,
    .loading,
    .toast,
    .btn,
    .results__close {
        display: none !important;
    }
    
    body {
        background: white;
    }
    
    .calculator,
    .results {
        background: white;
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    .header {
        background: white;
        color: black;
    }
}

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

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #000;
        --color-secondary: #fff;
        --gradient-primary: linear-gradient(135deg, #000 0%, #333 100%);
        --gradient-secondary: linear-gradient(135deg, #fff 0%, #f0f0f0 100%);
    }
}

/* Focus Styles */
*:focus {
    outline: 2px solid #8b5cf6;
    outline-offset: 2px;
}

button:focus,
input:focus,
select:focus {
    outline: 2px solid #8b5cf6;
    outline-offset: 2px;
}

/* 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;
}