/* Mobile (até 767px) */
@media (max-width: 767px) {
    .site-header {
        padding: var(--spacing-6) 0;
        text-align: center;
    }
    
    .site-title {
        font-size: var(--font-size-2xl);
        margin-bottom: var(--spacing-3);
    }
    
    .site-title::after {
        width: 60px;
        bottom: -6px;
    }
    
    .site-tagline {
        font-size: var(--font-size-base);
        line-height: 1.5;
        margin-bottom: var(--spacing-3);
    }
    
    .header-buttons {
        flex-direction: column;
        gap: var(--spacing-3);
        width: 100%;
        max-width: 280px;
        margin: 0 auto;
    }
    
    .calculator-container {
        padding: var(--spacing-4);
    }
    
    .section-title {
        font-size: var(--font-size-xl);
        margin-bottom: var(--spacing-6);
    }
    
    .article-content h3 {
        font-size: var(--font-size-lg);
    }
    
    .article-section {
        padding: var(--spacing-4);
    }
    
    .how-to-number {
        min-width: 40px;
        font-size: var(--font-size-xl);
    }
    
    .how-to-content h3 {
        font-size: var(--font-size-base);
    }
    
    .how-to-content p {
        font-size: var(--font-size-sm);
    }
    
    .footer-links {
        gap: var(--spacing-8);
    }
    
    .footer-links-column {
        flex: 1 1 100%;
        text-align: center;
    }
    
    .footer-links-title {
        display: block;
        margin-bottom: var(--spacing-3);
    }
    
    .footer-links-title::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .footer-links-column ul li a {
        padding-left: 0;
    }
    
    .footer-links-column ul li a::before {
        display: none;
    }
    
    .form-control {
        font-size: var(--font-size-base);
        padding: var(--spacing-3);
    }
    
    .result-value {
        font-size: var(--font-size-xl);
    }
    
    .tab-btn {
        font-size: var(--font-size-sm);
        padding: var(--spacing-2) var(--spacing-3);
    }
    
    .form-actions {
        flex-direction: column;
        gap: var(--spacing-3);
    }
    
    .back-to-top {
        bottom: var(--spacing-4);
        right: var(--spacing-4);
        width: 40px;
        height: 40px;
    }
}/**
 * Calculadora de Parcelas - Definitive Edition
 * Estilos principais - Mobile First
 * DEV: Felipo Bellini
 */

/* ----- Variáveis CSS ----- */
:root {
    /* Cores Principais - Paleta mais vibrante */
    --color-primary: #4f46e5;
    --color-primary-dark: #4338ca;
    --color-primary-light: #6366f1;
    --color-secondary: #0f172a;
    --color-tertiary: #64748b;
    
    /* Cores de Fundo */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-bg-accent: #ddd6fe;
    
    /* Cores de Texto */
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-tertiary: #64748b;
    --color-text-light: #f8fafc;
    --color-text-accent: #2563eb;
    
    /* Cores de Borda */
    --color-border-primary: #e2e8f0;
    --color-border-secondary: #cbd5e1;
    --color-border-focus: #3b82f6;
    
    /* Cores de Feedback */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;
    
    /* Tipografia */
    --font-family-base: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-xs: 0.75rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Espaçamento */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    
    /* Bordas e Sombras */
    --border-radius-sm: 0.125rem;
    --border-radius-md: 0.25rem;
    --border-radius-lg: 0.5rem;
    --border-radius-xl: 0.75rem;
    --border-radius-2xl: 1rem;
    --border-radius-full: 9999px;
    --border-width-thin: 1px;
    --border-width-normal: 2px;
    --border-width-thick: 4px;
    --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);
    
    /* Transições */
    --transition-normal: all 0.3s ease;
    --transition-slow: all 0.5s ease;
    --transition-fast: all 0.15s ease;
    
    /* Z-index */
    --z-index-dropdown: 1000;
    --z-index-sticky: 1020;
    --z-index-fixed: 1030;
    --z-index-modal-backdrop: 1040;
    --z-index-modal: 1050;
    --z-index-popover: 1060;
    --z-index-tooltip: 1070;
    
    /* Layout */
    --container-max-width: 1200px;
    --header-height: 4rem;
    --footer-height: 6rem;
    
    /* Novas sombras avançadas */
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    --shadow-outline: 0 0 0 3px rgba(66, 153, 225, 0.5);
    
    /* Efeitos de glassmorphism */
    --glass-background: rgba(255, 255, 255, 0.25);
    --glass-border: 1px solid rgba(255, 255, 255, 0.18);
    --glass-blur: blur(12px);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
}

/* ----- Reset e Bases ----- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-4);
    color: var(--color-text-primary);
}

p {
    margin-bottom: var(--spacing-4);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover, a:focus {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

img, svg {
    max-width: 100%;
    height: auto;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: 100%;
    line-height: 1.15;
}

/* ----- Acessibilidade ----- */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    padding: var(--spacing-2) var(--spacing-4);
    background-color: var(--color-primary);
    color: var(--color-text-light);
    z-index: var(--z-index-sticky);
    transition: top 0.3s ease;
}

.skip-link:focus {
    top: 0;
    outline: none;
    text-decoration: none;
}

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

/* ----- Layout ----- */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-4);
    padding-right: var(--spacing-4);
}

main {
    flex: 1;
    padding-top: var(--spacing-8);
    padding-bottom: var(--spacing-16);
}

.site-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-8) 0;
    position: relative;
    z-index: var(--z-index-sticky);
    color: white;
    position: relative;
    overflow: hidden;
}

.site-header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0) 60%);
    transform: rotate(45deg);
    z-index: 0;
    pointer-events: none;
}

.site-header .container {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.site-title {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-4);
    color: white;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: var(--font-weight-bold);
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    position: relative;
    display: inline-block;
}

.site-title::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: -10px;
    width: 80px;
    height: 4px;
    background-color: rgba(255,255,255,0.7);
    border-radius: 2px;
    transform: translateX(-50%);
}

.site-tagline {
    font-size: var(--font-size-lg);
    color: rgba(255,255,255,0.9);
    margin-bottom: var(--spacing-4);
    font-weight: var(--font-weight-light);
    max-width: 600px;
    text-align: center;
}

.header-buttons {
    display: flex;
    gap: var(--spacing-4);
    margin-top: var(--spacing-4);
}

.header-button {
    background-color: rgba(255,255,255,0.15);
    color: white;
    border: 1px solid rgba(255,255,255,0.3);
    padding: var(--spacing-2) var(--spacing-6);
    border-radius: var(--border-radius-full);
    font-weight: var(--font-weight-medium);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header-button:hover {
    background-color: rgba(255,255,255,0.25);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.section-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-8);
    padding-bottom: var(--spacing-3);
    border-bottom: var(--border-width-thin) solid var(--color-border-primary);
    text-align: center;
}

.site-footer {
    background-color: var(--color-secondary);
    color: var(--color-text-light);
    padding: var(--spacing-8) 0;
    margin-top: auto;
}

.footer-content {
    text-align: center;
}

.footer-copyright {
    margin-bottom: var(--spacing-2);
}

.footer-credits {
    margin-bottom: var(--spacing-2);
    font-size: var(--font-size-sm);
}

.footer-disclaimer {
    font-size: var(--font-size-xs);
    opacity: 0.8;
}

/* ----- Componentes ----- */

/* Calculadora Container */
.calculator-section {
    margin-bottom: var(--spacing-16);
}

.calculator-container {
    background-color: var(--color-bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-6);
    margin-bottom: var(--spacing-8);
    background-image: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.7) 100%);
    border: 1px solid rgba(255, 255, 255, 0.18);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.calculator-container:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-2xl);
}

/* Formulário */
.calculator-form {
    margin-bottom: var(--spacing-8);
}

.form-group {
    margin-bottom: var(--spacing-6);
}

.form-label {
    display: block;
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-2);
    color: var(--color-text-primary);
}

.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-4);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    background-clip: padding-box;
    border: var(--border-width-thin) solid var(--color-border-secondary);
    border-radius: var(--border-radius-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.08);
}

.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.25);
    outline: 0;
    transform: translateY(-2px);
}

.form-group {
    margin-bottom: var(--spacing-6);
    position: relative;
    transform: translateY(0);
    opacity: 1;
    transition: transform 0.5s ease, opacity 0.5s ease;
}

.form-group:nth-child(1) { animation: slideIn 0.5s ease 0.1s forwards; }
.form-group:nth-child(2) { animation: slideIn 0.5s ease 0.2s forwards; }
.form-group:nth-child(3) { animation: slideIn 0.5s ease 0.3s forwards; }
.form-group:nth-child(4) { animation: slideIn 0.5s ease 0.4s forwards; }
.form-group:nth-child(5) { animation: slideIn 0.5s ease 0.5s forwards; }

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

.form-control::placeholder {
    color: var(--color-text-tertiary);
    opacity: 0.7;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol, .unit-symbol {
    position: absolute;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
}

.currency-symbol {
    left: var(--spacing-3);
}

.unit-symbol {
    right: var(--spacing-3);
}

.input-wrapper .form-control {
    padding-left: var(--spacing-8);
}

.input-wrapper .form-control + .unit-symbol + .form-control {
    padding-right: var(--spacing-8);
}

.input-help {
    display: block;
    margin-top: var(--spacing-1);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

/* Botões */
.form-actions {
    display: flex;
    gap: var(--spacing-4);
    margin-top: var(--spacing-8);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-3) var(--spacing-6);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-base);
    line-height: 1.5;
    text-align: center;
    vertical-align: middle;
    border: var(--border-width-thin) solid transparent;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition-normal);
    gap: var(--spacing-2);
}

.btn-primary {
    color: var(--color-text-light);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-color: var(--color-primary);
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.4);
    transform: translateY(0);
    transition: all 0.3s ease;
}

.btn-primary:hover, .btn-primary:focus {
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    border-color: var(--color-primary-light);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.6);
    transform: translateY(-2px);
}

.btn-secondary {
    color: var(--color-text-primary);
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-border-primary);
}

.btn-secondary:hover, .btn-secondary:focus {
    background-color: var(--color-border-primary);
    border-color: var(--color-border-secondary);
}

.btn-outline {
    color: var(--color-primary);
    background-color: transparent;
    border-color: var(--color-primary);
}

.btn-outline:hover, .btn-outline:focus {
    color: var(--color-text-light);
    background-color: var(--color-primary);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.icon {
    width: 1em;
    height: 1em;
}

/* Resultados */
.calculator-results {
    background-color: var(--color-bg-tertiary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-6);
    margin-top: var(--spacing-8);
}

.results-title {
    text-align: center;
    margin-bottom: var(--spacing-6);
}

.results-summary {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-8);
}

.result-card {
    background-color: var(--color-bg-primary);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-5);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.8);
    overflow: hidden;
    position: relative;
}

.result-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0) 70%);
    opacity: 0;
    transform: scale(0.5);
    transition: transform 0.5s ease, opacity 0.5s ease;
    z-index: 0;
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.result-card:hover::before {
    opacity: 0.5;
    transform: scale(1);
}

.result-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: var(--font-weight-medium);
    position: relative;
    z-index: 1;
}

.result-value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Tabs */
.results-tab-container {
    margin-bottom: var(--spacing-6);
}

.tab-nav {
    display: flex;
    border-bottom: var(--border-width-thin) solid var(--color-border-primary);
    margin-bottom: var(--spacing-6);
}

.tab-btn {
    padding: var(--spacing-3) var(--spacing-4);
    border: none;
    background: none;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    cursor: pointer;
    position: relative;
    transition: var(--transition-normal);
}

.tab-btn.active {
    color: var(--color-primary);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Tabela de Amortização */
.table-responsive {
    overflow-x: auto;
    margin-bottom: var(--spacing-4);
}

.table-amortizacao {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.table-amortizacao caption {
    margin-bottom: var(--spacing-2);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
}

.table-amortizacao th {
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    text-align: left;
    padding: var(--spacing-2) var(--spacing-3);
    border-bottom: var(--border-width-thin) solid var(--color-border-primary);
}

.table-amortizacao td {
    padding: var(--spacing-2) var(--spacing-3);
    border-bottom: var(--border-width-thin) solid var(--color-border-primary);
}

.table-amortizacao tbody tr:hover {
    background-color: var(--color-bg-accent);
}

/* Gráfico */
.chart-container {
    background-color: var(--color-bg-primary);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-4);
    height: 300px;
}

/* Ações de Resultado */
.results-actions {
    display: flex;
    gap: var(--spacing-3);
    justify-content: center;
    margin-top: var(--spacing-6);
}

/* Cards de Informação */
.info-section {
    margin-bottom: var(--spacing-16);
}

.info-cards {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--spacing-6);
}

.info-card {
    background-color: var(--color-bg-primary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.info-card-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-3);
    color: var(--color-primary);
}

.info-card-text {
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

/* Acordeão de FAQ */
.faq-section {
    margin-bottom: var(--spacing-16);
}

.accordion {
    border: var(--border-width-thin) solid var(--color-border-primary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.accordion-item {
    border-bottom: var(--border-width-thin) solid var(--color-border-primary);
}

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

.accordion-header {
    margin: 0;
}

.accordion-button {
    display: flex;
    align-items: center;
    width: 100%;
    padding: var(--spacing-4) var(--spacing-6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    text-align: left;
    background-color: var(--color-bg-primary);
    border: none;
    cursor: pointer;
    position: relative;
    transition: var(--transition-normal);
}

.accordion-button:hover {
    background-color: var(--color-bg-tertiary);
}

.accordion-button::after {
    content: '+';
    position: absolute;
    right: var(--spacing-6);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-tertiary);
    transition: var(--transition-normal);
}

.accordion-button[aria-expanded="true"]::after {
    content: '−';
}

.accordion-collapse {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    background-color: var(--color-bg-secondary);
}

.accordion-button[aria-expanded="true"] + .accordion-collapse {
    max-height: 500px;
    border-top: 1px solid var(--color-border-primary);
}

.accordion-body {
    padding: var(--spacing-4) var(--spacing-6);
    background-color: var(--color-bg-secondary);
}

/* ----- Utilitários ----- */
.hidden {
    display: none !important;
}

/* ----- Media Queries ----- */
/* Mobile First (base é mobile) */

/* Tablets (768px e acima) */
@media (min-width: 768px) {
    .calculator-form {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-6);
    }
    
    .form-actions {
        grid-column: span 2;
    }
    
    .results-summary {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .info-cards {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    /* How To responsividade */
    .how-to-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Cabeçalho responsivo */
    .site-header {
        padding: var(--spacing-10) 0;
    }
    
    .site-title {
        font-size: var(--font-size-4xl);
        margin-bottom: var(--spacing-6);
    }
    
    .site-tagline {
        font-size: var(--font-size-xl);
        margin-bottom: var(--spacing-6);
    }
    
    /* Footer responsividade */
    .footer-content {
        flex-direction: row;
        flex-wrap: wrap;
        align-items: flex-start;
    }
    
    .footer-branding {
        flex: 1 1 100%;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
        width: 100%;
    }
    
    .footer-bottom {
        flex: 1 1 100%;
        margin-top: var(--spacing-6);
    }
}

/* Desktops (1024px e acima) */
@media (min-width: 1024px) {
    .site-title {
        font-size: var(--font-size-4xl);
    }
    
    .site-tagline {
        font-size: var(--font-size-xl);
    }
    
    .calculator-container {
        padding: var(--spacing-8);
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-8);
        align-items: start;
    }
    
    .calculator-form {
        margin-bottom: 0;
    }
    
    /* Corrigir o grid para desktop */
    .calculator-form {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-6);
    }
    
    .form-actions {
        grid-column: span 2;
    }
    
    .calculator-results {
        margin-top: 0;
    }
    
    .form-group {
        margin-bottom: var(--spacing-5);
    }
    
    /* How To responsividade */
    .how-to-container {
        grid-template-columns: repeat(3, 1fr);
    }
    
    /* Footer melhorias */
    .footer-links {
        justify-content: space-between;
        padding: 0 var(--spacing-8);
        gap: var(--spacing-16);
    }
    
    .footer-links-column {
        min-width: 200px;
    }
    
    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
        flex-wrap: wrap;
        text-align: left;
        gap: var(--spacing-4);
        padding: var(--spacing-6) var(--spacing-8) 0;
    }
    
    .footer-copyright, .footer-credits {
        flex: 1 0 45%;
    }
    
    .footer-site {
        flex: 1 0 45%;
        text-align: right;
    }
    
    .footer-disclaimer {
        flex: 1 1 100%;
        margin-top: var(--spacing-4);
    }
}

/* Telas grandes (1280px e acima) */
@media (min-width: 1280px) {
    .container {
        padding-left: var(--spacing-8);
        padding-right: var(--spacing-8);
    }
    
    .site-header {
        padding: var(--spacing-12) 0;
    }
    
    .site-title {
        font-size: var(--font-size-4xl);
    }
    
    .site-tagline {
        font-size: var(--font-size-xl);
        max-width: 800px;
    }
    
    .how-to-container {
        gap: var(--spacing-8);
    }
    
    .article-container {
        max-width: 900px;
    }
}

/* ----- Animações ----- */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
        box-shadow: var(--shadow-lg);
    }
    50% {
        transform: scale(1.02);
        box-shadow: var(--shadow-xl);
    }
    100% {
        transform: scale(1);
        box-shadow: var(--shadow-lg);
    }
}

@keyframes gradient {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.calculator-results[hidden="false"] {
    animation: fadeIn 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.results-title {
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light), var(--color-primary));
    background-size: 200% auto;
    color: transparent;
    -webkit-background-clip: text;
    background-clip: text;
    animation: gradient 3s ease infinite;
    display: inline-block;
}

/* Adicionar efeito de hover nos cards de informação */
.info-card:hover .info-card-title {
    color: var(--color-primary-light);
}

/* Adicionar animação de loading */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* ----- Artigo SEO ----- */
.article-section {
    margin-bottom: var(--spacing-16);
    background-color: var(--color-bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-8);
}

.article-container {
    max-width: 800px;
    margin: 0 auto;
}

.article-content {
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

.article-intro {
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-6);
}

.article-content h3 {
    color: var(--color-primary);
    font-size: var(--font-size-xl);
    margin-top: var(--spacing-8);
    margin-bottom: var(--spacing-4);
    padding-bottom: var(--spacing-2);
    border-bottom: 1px solid var(--color-border-primary);
}

.article-content h4 {
    color: var(--color-secondary);
    font-size: var(--font-size-lg);
    margin-top: var(--spacing-6);
    margin-bottom: var(--spacing-3);
}

.article-list {
    margin-bottom: var(--spacing-6);
    padding-left: var(--spacing-6);
}

.article-list li {
    margin-bottom: var(--spacing-2);
}

.article-list.numbered {
    counter-reset: item;
    list-style-type: none;
    padding-left: 0;
}

.article-list.numbered li {
    counter-increment: item;
    margin-bottom: var(--spacing-4);
    position: relative;
    padding-left: var(--spacing-8);
}

.article-list.numbered li::before {
    content: counter(item);
    background-color: var(--color-primary);
    color: white;
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    left: 0;
    top: 0;
}

.article-highlight {
    background-color: var(--color-bg-accent);
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-4) var(--spacing-6);
    margin: var(--spacing-6) 0;
    border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
}

.article-highlight p {
    margin-bottom: 0;
    font-style: italic;
}

/* ----- How To Section ----- */
.how-to-section {
    margin-bottom: var(--spacing-16);
}

.how-to-container {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-8);
}

.how-to-card {
    background-color: var(--color-bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.how-to-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.how-to-number {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    min-width: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.how-to-content {
    padding: var(--spacing-4);
    flex: 1;
}

.how-to-content h3 {
    margin-bottom: var(--spacing-2);
    color: var(--color-primary);
}

.how-to-content p {
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

.how-to-card.wide {
    grid-column: 1 / -1;
}

.how-to-tips {
    background-color: var(--color-bg-accent);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-md);
}

.how-to-tips h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-4);
}

.how-to-tips ul {
    padding-left: var(--spacing-6);
    color: var(--color-text-secondary);
}

.how-to-tips li {
    margin-bottom: var(--spacing-2);
}

/* ----- Footer Redesign ----- */
.site-footer {
    background: linear-gradient(135deg, var(--color-secondary) 0%, #090f1f 100%);
    color: var(--color-text-light);
    padding: var(--spacing-12) 0 var(--spacing-8);
    margin-top: auto;
    position: relative;
    overflow: hidden;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, 
        rgba(255,255,255,0), 
        rgba(255,255,255,0.3), 
        rgba(255,255,255,0));
}

.site-footer::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
    z-index: 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-8);
    position: relative;
    z-index: 1;
}

.footer-branding {
    text-align: center;
    margin-bottom: var(--spacing-8);
    padding-bottom: var(--spacing-8);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    position: relative;
}

.footer-branding::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 2px;
    background: linear-gradient(90deg, 
        rgba(79, 70, 229, 0), 
        rgba(79, 70, 229, 1), 
        rgba(79, 70, 229, 0));
}

.logo {
    padding-bottom: 15px;
}
    
.footer-logo {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-2);
    color: white;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    display: inline-block;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.footer-tagline {
    font-size: var(--font-size-base);
    opacity: 0.8;
    max-width: 400px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-12);
    margin-bottom: var(--spacing-8);
}

.footer-links-column {
    min-width: 160px;
}

.footer-links-title {
    color: white;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-6);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    display: inline-block;
    padding-bottom: var(--spacing-2);
}

.footer-links-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--color-primary);
}

.footer-links-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links-column ul li {
    margin-bottom: var(--spacing-3);
}

.footer-links-column ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    padding-left: var(--spacing-4);
    display: inline-block;
}

.footer-links-column ul li a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background-color: var(--color-primary);
    border-radius: 50%;
    opacity: 0.7;
    transition: all 0.3s ease;
}

.footer-links-column ul li a:hover {
    color: white;
    text-decoration: none;
    transform: translateX(5px);
}

.footer-links-column ul li a:hover::before {
    opacity: 1;
    width: 8px;
    height: 8px;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.footer-copyright, .footer-credits, .footer-disclaimer, .footer-site {
    margin-bottom: var(--spacing-1);
    font-size: var(--font-size-sm);
}

.footer-credits {
    color: rgba(255, 255, 255, 0.8);
}

.footer-site {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-4);
}

.footer-site a {
    color: var(--color-primary-light);
    font-weight: var(--font-weight-bold);
    position: relative;
    padding: 0 2px;
}

.footer-site a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 100%;
    height: 1px;
    background-color: var(--color-primary-light);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

.footer-site a:hover {
    color: white;
}

.footer-site a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.footer-disclaimer {
    font-size: var(--font-size-xs);
    opacity: 0.6;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* ----- Melhorias de UX ----- */
/* Indicador de Scroll */
.scroll-indicator {
    height: 5px;
    background: linear-gradient(to right, var(--color-primary), var(--color-primary-light));
    position: fixed;
    top: 0;
    left: 0;
    z-index: var(--z-index-fixed);
    width: 0%;
    transition: width 0.1s ease;
}

/* Botão de voltar ao topo */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-6);
    right: var(--spacing-6);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    z-index: var(--z-index-fixed);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-5px);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

/* ----- Dark Mode ----- */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg-primary: #1e293b;
        --color-bg-secondary: #0f172a;
        --color-bg-tertiary: #1e293b;
        --color-bg-accent: #172554;
        
        --color-text-primary: #f8fafc;
        --color-text-secondary: #cbd5e1;
        --color-text-tertiary: #94a3b8;
        
        --color-border-primary: #334155;
        --color-border-secondary: #475569;
    }
    
    .form-control {
        background-color: #0f172a;
        color: var(--color-text-primary);
    }
    
    .result-card, .info-card, .calculator-container {
        background-color: #0f172a;
    }
    
    .accordion-button {
        background-color: #1e293b;
    }
    
    .accordion-button:hover {
        background-color: #334155;
    }
    
    .chart-container {
        background-color: #0f172a;
    }
}

/* ----- Print Styles ----- */
@media print {
    body {
        background: #fff;
        color: #000;
    }
    
    .site-header, .site-footer, .form-actions, .results-actions, .info-section, .faq-section {
        display: none;
    }
    
    .calculator-results {
        page-break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .calculator-form {
        display: none;
    }
    
    .container {
        width: 100%;
        max-width: 100%;
        padding: 0;
        margin: 0;
    }
    
    .chart-container {
        display: none;
    }
}

/* ----- Estilos para baixa largura de banda ----- */
@media (prefers-reduced-data: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
    
    img {
        max-width: 80%;
    }
}

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