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

/* ========================================
   CSS Custom Properties
   ======================================== */
:root {
    /* Color Palette */
    --color-primary: #833AB4;
    --color-secondary: #FD1D1D;
    --color-accent-1: #F77737;
    --color-accent-2: #FCAF45;
    --color-accent-3: #FFDC80;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #833AB4 0%, #FD1D1D 50%, #F77737 100%);
    --gradient-secondary: linear-gradient(135deg, #FCAF45 0%, #FFDC80 100%);
    
    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-black: #000000;
    --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;
    
    /* Semantic Colors */
    --color-success: #10B981;
    --color-error: #EF4444;
    --color-warning: #F59E0B;
    --color-info: #3B82F6;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Typography */
    --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;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --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);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
}

/* ========================================
   Reset & Base Styles
   ======================================== */
*, *::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-900);
    background: var(--color-gray-50);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-bottom: 80px; /* Space for bottom nav */
}

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

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); }

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

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

/* ========================================
   Header
   ======================================== */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--gradient-primary);
    color: var(--color-white);
    padding: var(--spacing-md) var(--spacing-md);
    text-align: center;
    box-shadow: var(--shadow-lg);
    z-index: var(--z-fixed);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
}
.black-bar {
position: fixed;
bottom: 0;
left: 0;
right: 0;
height: 30px;
background-color: #000000;
z-index: 1001;
}
.app-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: nowrap;
    flex-direction: row;
    white-space: nowrap;
}

.app-logo {
    height: 60px;
    width: auto;
    object-fit: contain;
    display: block;
    flex-shrink: 0;
}

.app-subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.95;
    font-weight: 400;
}

/* ========================================
   Main Content
   ======================================== */
.app-main {
    flex: 1;
    padding: var(--spacing-xl) var(--spacing-md);
    margin-top: 160px; /* Espaço para o header fixo no mobile */
    padding-top: var(--spacing-lg);
}

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

/* Section Management */
.app-main > section {
    display: none;
}

.app-main > section.active {
    display: block;
    animation: fadeIn var(--transition-base);
}

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

/* ========================================
   Calculator Section
   ======================================== */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
}

.calculator-panel,
.suggestion-panel {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.panel-header {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-gray-100);
}

.panel-header h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-primary);
    margin-bottom: 0;
}

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

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

.form-group label {
    font-weight: 600;
    color: var(--color-gray-700);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.form-group input {
    padding: var(--spacing-md);
    border: 2px solid var(--color-gray-200);
    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 {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(131, 58, 180, 0.1);
}

.form-group input:invalid:not(:placeholder-shown) {
    border-color: var(--color-error);
}

.error-message {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    display: none;
}

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

/* ========================================
   Buttons
   ======================================== */
.btn {
    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);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-family: var(--font-family);
    min-height: 44px; /* Touch target */
}

.btn:active {
    transform: scale(0.98);
}

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

.btn-primary:hover {
    opacity: 0.9;
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--color-gray-300);
}

.btn-success {
    background: var(--color-success);
    color: var(--color-white);
    width: 100%;
    margin-top: var(--spacing-md);
}

.btn-success:hover {
    background: #059669;
}

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

.btn-danger:hover {
    background: #DC2626;
}

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

.form-actions .btn {
    flex: 1;
}

/* ========================================
   Results Display
   ======================================== */
.results-container {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--color-gray-100);
}

.results-container h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.result-card {
    background: var(--color-gray-50);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 2px solid transparent;
    transition: all var(--transition-fast);
}

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

.result-margin {
    border-color: var(--color-primary);
}

.result-markup {
    border-color: var(--color-accent-1);
}

.result-profit {
    border-color: var(--color-success);
}

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

.result-label {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.result-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-gray-900);
}

/* ========================================
   Suggestion Panel
   ======================================== */
.suggestion-result {
    margin-top: var(--spacing-xl);
}

.suggestion-card {
    background: var(--gradient-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    text-align: center;
    color: var(--color-gray-900);
}

.suggestion-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
}

.suggestion-label {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.suggestion-value {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.suggestion-details {
    background: rgba(255, 255, 255, 0.5);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: left;
}

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

.suggestion-details p:last-child {
    margin-bottom: 0;
}

/* ========================================
   Products Section
   ======================================== */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.section-header h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: 0;
}

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

.product-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

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

.product-name {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-gray-900);
}

.product-delete {
    background: transparent;
    border: none;
    color: var(--color-error);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    min-height: 44px;
    min-width: 44px;
}

.product-delete:hover {
    background: var(--color-error);
    color: var(--color-white);
}

.product-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.product-info-item {
    display: flex;
    flex-direction: column;
}

.product-info-label {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xs);
}

.product-info-value {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-gray-900);
}

.product-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-gray-200);
}

.product-metric {
    text-align: center;
}

.product-metric-label {
    font-size: var(--font-size-xs);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xs);
}

.product-metric-value {
    font-size: var(--font-size-lg);
    font-weight: 700;
}

.metric-margin { color: var(--color-primary); }
.metric-markup { color: var(--color-accent-1); }
.metric-profit { color: var(--color-success); }

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    display: none;
}

.empty-state.show {
    display: block;
}

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

.empty-state h3 {
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    color: var(--color-gray-500);
}

/* ========================================
   FAQ Section
   ======================================== */
.section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

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

.faq-item {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: var(--spacing-lg);
    background: transparent;
    border: none;
    text-align: left;
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-fast);
    font-family: var(--font-family);
    color: var(--color-gray-900);
    min-height: 44px;
}

.faq-question:hover {
    background: var(--color-gray-50);
}

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

.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; /* Espaço para o footer fixo */
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-gray-600);
    transition: all var(--transition-fast);
    border-radius: var(--radius-md);
    min-width: 70px;
    min-height: 60px;
    justify-content: center;
}

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

.nav-item span {
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.nav-item:hover,
.nav-item.active {
    color: var(--color-primary);
    background: rgba(131, 58, 180, 0.1);
}

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

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

.footer-content p:last-child {
    margin-bottom: 0;
}

.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 Notification
   ======================================== */
.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-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.toast-icon {
    font-size: var(--font-size-xl);
}

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

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

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

/* ========================================
   Responsive Design
   ======================================== */

/* Tablet (768px+) */
@media (min-width: 768px) {
    .app-header {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .app-title {
        font-size: var(--font-size-4xl);
    }
    
    .app-logo {
        height: 80px;
    }
    
    .app-main {
        margin-top: 160px; /* Mais espaço em telas maiores */
        padding-top: var(--spacing-xl);
    }
    
    .calculator-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .results-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .product-info {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
    .app-logo {
        height: 90px;
    }
    
    .app-main {
        margin-top: 180px;
    }
    
    .products-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .bottom-nav {
        display: none;
    }
    
    body {
        padding-bottom: 0;
    }
    
    .app-main > section {
        display: block;
    }
    
    .section-calculator {
        margin-bottom: var(--spacing-2xl);
    }
    
    .section-products {
        margin-bottom: var(--spacing-2xl);
    }
}

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }
}

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

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

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .bottom-nav,
    .app-footer,
    .btn,
    .faq-question {
        display: none;
    }
    
    .app-main > section {
        display: block;
        page-break-inside: avoid;
    }
}