/**
 * Calculadora de LTV - Estilos
 * Desenvolvido por B20 Conteúdo Digital
 * https://www.b20.com.br
 */

/* ========================================
   CSS CUSTOM PROPERTIES
   ======================================== */
:root {
    /* Cores principais */
    --color-primary: #833AB4;
    --color-secondary: #FD1D1D;
    --color-accent-1: #F77737;
    --color-accent-2: #FCAF45;
    --color-accent-3: #FFDC80;
    
    /* Gradientes */
    --gradient-primary: linear-gradient(135deg, #833AB4 0%, #FD1D1D 50%, #F77737 100%);
    --gradient-secondary: linear-gradient(135deg, #FCAF45 0%, #FFDC80 100%);
    
    /* Cores de sistema */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;
    
    /* Cores neutras */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* Espaçamento */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Tipografia */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 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;
    --font-size-4xl: 2.25rem;
    
    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Transições */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ========================================
   RESET E BASE
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background: var(--color-gray-50);
    min-height: 100vh;
    padding-bottom: 80px;
}

/* ========================================
   TIPOGRAFIA
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--color-gray-900);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

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

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

a:hover {
    color: var(--color-secondary);
}

/* ========================================
   LAYOUT
   ======================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Compensa o header fixo para o conteúdo não ficar escondido */
main#main-content {
    margin-top: 160px;
}

.section {
    display: none;
    padding: var(--spacing-xl) 0;
    animation: fadeIn var(--transition-base);
}

.section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   HEADER
   ======================================== */
.app-header {
    background: var(--gradient-primary);
    color: var(--color-white);
    padding: var(--spacing-xl) 0;
    text-align: center;
    box-shadow: var(--shadow-lg);
    overflow: visible; /* permite a logo crescer visualmente sem aumentar o header */
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
}

/* Header container como flex, alinhado à esquerda */
.header-container {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: var(--spacing-lg);
    text-align: left;
}

.header-text h1,
.header-text .subtitle {
    text-align: left;
}

.black-bar {
position: fixed;
bottom: 0;
left: 0;
right: 0;
height: 30px;
background-color: #000000;
z-index: 1001;
}
.app-header h1 {
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-3xl);
}

.subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.95;
    margin-bottom: 0;
}

/* Header Brand / Logo */
.brand-logo {
    display: block;
    height: 80px; /* base menor para não aumentar o header */
    width: auto;
    max-width: 80%;
    margin: 0 var(--spacing-md) 0 0;
    object-fit: contain;
    image-rendering: -webkit-optimize-contrast;
    transform: scale(1.6); /* aumenta visualmente sem impactar o fluxo */
    transform-origin: left center;
    will-change: transform;
}

/* Reserva espaço horizontal para a logo ampliada sem empurrar o texto para baixo */
.header-brand {
    flex: 0 0 240px; /* ajuste conforme a proporção da sua imagem */
    display: flex;
    align-items: center;
}

/* ========================================
   CARDS
   ======================================== */
.welcome-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.welcome-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-primary);
}

.welcome-icon i {
    font-size: 4rem;
}

.calculator-modes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-2xl) 0;
}

.mode-card {
    background: var(--color-white);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
}

.mode-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.mode-card i {
    font-size: 3rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.mode-card h3 {
    margin-bottom: var(--spacing-sm);
}

.mode-card p {
    color: var(--color-gray-600);
    margin-bottom: 0;
}

.info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.info-card {
    background: var(--gradient-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: left;
}

.info-card i {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.info-card h4 {
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
}

.info-card p {
    color: var(--color-gray-700);
    margin-bottom: 0;
    font-size: var(--font-size-sm);
}

/* ========================================
   CALCULATOR
   ======================================== */
.calculator-container {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    max-width: 800px;
    margin: 0 auto;
}

/* Progress Bar */
.progress-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-2xl);
    position: relative;
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    position: relative;
    z-index: 2;
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--color-gray-200);
    color: var(--color-gray-500);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-lg);
    transition: all var(--transition-base);
}

.progress-step.active .step-number {
    background: var(--gradient-primary);
    color: var(--color-white);
    transform: scale(1.1);
}

.progress-step.completed .step-number {
    background: var(--color-success);
    color: var(--color-white);
}

.step-label {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    font-weight: 500;
    text-align: center;
}

.progress-step.active .step-label {
    color: var(--color-primary);
    font-weight: 600;
}

.progress-line {
    flex: 1;
    height: 2px;
    background: var(--color-gray-200);
    position: relative;
    top: -20px;
}

/* Wizard Form */
.wizard-form {
    position: relative;
}

.wizard-step {
    display: none;
    animation: slideIn var(--transition-base);
}

.wizard-step.active {
    display: block;
}

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

.wizard-step h3 {
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.wizard-step h3 i {
    color: var(--color-primary);
    font-size: 1.2em;
}

.step-description {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xl);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-xl);
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
    font-family: var(--font-family);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(131, 58, 180, 0.1);
}

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

.help-text {
    display: block;
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.error-message {
    display: none;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: #fee;
    color: var(--color-error);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
}

.error-message.show {
    display: block;
}

/* Wizard Actions */
.wizard-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: space-between;
    margin-top: var(--spacing-2xl);
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    font-family: var(--font-family);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--color-gray-200);
    color: var(--color-gray-700);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-gray-300);
}

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

.btn-success:hover:not(:disabled) {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-danger {
    background: var(--color-error);
    color: var(--color-white);
}

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

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

/* ========================================
   RESULTS
   ======================================== */
.result-section {
    animation: fadeIn var(--transition-base);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.result-header h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.result-header h3 i {
    color: var(--color-primary);
}

.main-result {
    background: var(--gradient-primary);
    color: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.result-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.result-icon i {
    font-size: 3rem;
    color: var(--color-white);
}

.result-label {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin-bottom: var(--spacing-sm);
}

.result-value {
    font-size: var(--font-size-4xl);
    font-weight: 700;
}

.result-breakdown {
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.result-breakdown h4 {
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.result-breakdown h4 i {
    color: var(--color-primary);
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-gray-200);
}

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

.breakdown-item.highlight {
    background: var(--gradient-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
}

.breakdown-label {
    font-weight: 600;
    color: var(--color-gray-700);
}

.breakdown-value {
    color: var(--color-gray-900);
    font-weight: 700;
}

.result-insights {
    background: var(--color-info);
    color: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.result-insights h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.result-insights h4 i {
    color: var(--color-white);
}

.insight-item {
    padding: var(--spacing-sm) 0;
}

.result-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ========================================
   HISTORY
   ======================================== */
.history-container {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section-header h2 i {
    color: var(--color-primary);
}

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

.history-item {
    background: var(--color-gray-50);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-fast);
}

.history-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--spacing-md);
}

.history-ltv {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
}

.history-date {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.history-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.history-detail {
    font-size: var(--font-size-sm);
}

.history-detail strong {
    color: var(--color-gray-700);
}

.history-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-gray-500);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.5;
}

.comparison-section {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 2px solid var(--color-gray-200);
}

.comparison-section h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.comparison-section h3 i {
    color: var(--color-primary);
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.comparison-card {
    background: var(--gradient-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
}

.comparison-card h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray-900);
}

.comparison-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
}

.comparison-count {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin-top: var(--spacing-sm);
}

/* ========================================
   FAQ
   ======================================== */
.faq-container {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
    max-width: 900px;
    margin: 0 auto;
}

.faq-container h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.faq-container h2 i {
    color: var(--color-primary);
}

.faq-item {
    border-bottom: 1px solid var(--color-gray-200);
    margin-bottom: var(--spacing-md);
}

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

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    text-align: left;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-gray-900);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
}

.faq-question:hover {
    color: var(--color-primary);
}

.faq-icon {
    font-size: var(--font-size-2xl);
    color: var(--color-primary);
    transition: transform var(--transition-fast);
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--color-gray-700);
    line-height: 1.8;
}

.faq-answer[hidden] {
    display: none;
}

/* ========================================
   BOTTOM NAVIGATION
   ======================================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--color-white);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-around;
    padding: var(--spacing-sm) 0;
    z-index: var(--z-fixed);
    margin-bottom: 80px;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    color: var(--color-gray-500);
    text-decoration: none;
    transition: all var(--transition-fast);
    min-width: 60px;
}

.nav-item i {
    font-size: var(--font-size-xl);
}

.nav-item span {
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.nav-item.active {
    color: var(--color-primary);
}

.nav-item:hover {
    color: var(--color-primary);
    transform: translateY(-2px);
}

/* ========================================
   FOOTER
   ======================================== */
.app-footer {
    background: var(--color-gray-900);
    color: var(--color-white);
    text-align: center;
    padding: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
    margin-bottom: 60px;
}

.app-footer p {
    margin-bottom: var(--spacing-sm);
}

.app-footer a {
    color: var(--color-white);
}

.b20-link {
    color: var(--color-accent-2);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.b20-link:hover {
    color: var(--color-accent-3);
    text-decoration: underline;
    transform: scale(1.05);
    display: inline-block;
}

/* ========================================
   TOAST NOTIFICATIONS
   ======================================== */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--color-gray-900);
    color: var(--color-white);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-tooltip);
    opacity: 0;
    transition: all var(--transition-base);
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.toast.success {
    background: var(--color-success);
}

.toast.error {
    background: var(--color-error);
}

.toast.warning {
    background: var(--color-warning);
}

/* ========================================
   MODAL
   ======================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: var(--z-modal);
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal.show {
    display: flex;
}

.modal-content {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn var(--transition-base);
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    color: var(--color-gray-500);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--color-gray-900);
}

.modal-body {
    padding: var(--spacing-xl);
}

.share-options {
    display: grid;
    gap: var(--spacing-md);
}

.share-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-gray-50);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
}

.share-btn:hover {
    background: var(--color-gray-100);
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.share-btn i {
    font-size: var(--font-size-xl);
    color: var(--color-primary);
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
        --font-size-xl: 1.125rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .app-header {
        padding: var(--spacing-lg) 0;
    }
    main#main-content {
        margin-top: 120px;
    }
    .header-container {
        gap: var(--spacing-md);
    }
    .brand-logo {
        height: 80px;
        max-width: 80%;
        margin-bottom: var(--spacing-sm);
        transform: scale(1.3);
        transform-origin: left center;
    }
    .header-brand {
        flex: 0 0 90px;
        display: flex;
        align-items: center;
    }
    
    .calculator-modes {
        grid-template-columns: 1fr;
    }
    
    .info-cards {
        grid-template-columns: 1fr;
    }
    
    .wizard-actions {
        flex-direction: column;
    }
    
    .wizard-actions .btn {
        width: 100%;
        justify-content: center;
    }
    
    .result-actions {
        flex-direction: column;
    }
    
    .result-actions .btn {
        width: 100%;
        justify-content: center;
    }
    
    .progress-bar {
        flex-wrap: wrap;
    }
    
    .step-label {
        display: none;
    }
    
    .comparison-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .section-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }
    
    .section-header .btn {
        width: 100%;
    }
    
    .history-header {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .history-actions {
        flex-wrap: wrap;
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */
.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;
}

*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ========================================
   PRINT STYLES
   ======================================== */
@media print {
    .bottom-nav,
    .app-footer,
    .wizard-actions,
    .result-actions {
        display: none;
    }
    
    body {
        padding-bottom: 0;
    }
}