/* ======================================
   CONSULTA NCM - CSS MODERNO E RESPONSIVO
   Autor: Arquiteto Web Sênior
   ====================================== */

/* ======================================
   VARIÁVEIS CSS E CONFIGURAÇÕES GLOBAIS
   ====================================== */

:root {
    /* Cores Primárias - Tema Azul Profissional */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-primary-lighter: #dbeafe;
    
    /* Cores Secundárias */
    --color-secondary: #10b981;
    --color-accent: #f59e0b;
    --color-warning: #ef4444;
    
    /* Cores Neutras */
    --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;
    
    /* Cores de Texto */
    --color-text-primary: var(--color-gray-900);
    --color-text-secondary: var(--color-gray-600);
    --color-text-muted: var(--color-gray-400);
    
    /* Cores de Fundo */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: var(--color-gray-50);
    --color-bg-tertiary: var(--color-gray-100);
    
    /* Sombreamento */
    --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);
    
    /* Tipografia */
    --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 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;
    
    /* 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;
    --spacing-20: 5rem;
    
    /* Bordas */
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --border-radius-xl: 1rem;
    
    /* Transições */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;
    
    /* Breakpoints */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
}

/* ======================================
   RESET E ESTILOS 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-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-secondary);
    overflow-x: hidden;
}

/* Acessibilidade - Texto oculto para leitores de tela */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Container responsivo */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-6);
    }
}

/* ======================================
   HEADER - CABEÇALHO MODERNO
   ====================================== */

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

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.header__content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.header__brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-3);
}

.header__icon {
    font-size: var(--font-size-3xl);
    opacity: 0.9;
}

.header__title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin: 0;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

/* ======================================
   SEÇÃO DE BUSCA - CARD MODERNO
   ====================================== */

.search-section {
    padding: var(--spacing-12) 0;
}

.search-card {
    background: var(--color-bg-primary);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-8);
    box-shadow: var(--shadow-xl);
    margin-bottom: var(--spacing-8);
    border: 1px solid var(--color-gray-200);
    transition: transform var(--transition-base);
}

.search-card:hover {
    transform: translateY(-2px);
}

.search-card__title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-6);
    text-align: center;
}

/* ======================================
   FORMULÁRIO DE BUSCA
   ====================================== */

.search-form {
    margin-bottom: var(--spacing-8);
}

.search-input-group {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--color-gray-50);
    border-radius: var(--border-radius-lg);
    border: 2px solid transparent;
    transition: all var(--transition-base);
    margin-bottom: var(--spacing-4);
}

.search-input-group:focus-within {
    background: var(--color-bg-primary);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-input {
    flex: 1;
    padding: var(--spacing-4) var(--spacing-5);
    font-size: var(--font-size-base);
    border: none;
    background: transparent;
    color: var(--color-text-primary);
    outline: none;
    min-height: 56px;
}

.search-input::placeholder {
    color: var(--color-text-muted);
}

.search-button {
    position: absolute;
    right: var(--spacing-2);
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--border-radius-md);
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.search-button:hover {
    background: var(--color-primary-dark);
    transform: translateY(-50%) scale(1.05);
}

.search-button:active {
    transform: translateY(-50%) scale(0.95);
}

.search-help {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    margin: 0;
}

/* ======================================
   FILTROS RÁPIDOS
   ====================================== */

.quick-filters {
    border-top: 1px solid var(--color-gray-200);
    padding-top: var(--spacing-6);
}

.quick-filters__title {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-4);
}

.quick-filters__buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-3);
}

.filter-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--border-radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.filter-btn:hover {
    background: var(--color-primary-lighter);
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-1px);
}

.filter-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* ======================================
   SEÇÃO DE RESULTADOS
   ====================================== */

.results-section {
    min-height: 400px;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-6);
    flex-wrap: wrap;
    gap: var(--spacing-4);
}

.results-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.results-count {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    background: var(--color-gray-100);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--border-radius-md);
    font-weight: 500;
}

/* ======================================
   ESTADOS DE CARREGAMENTO
   ====================================== */

.loading-state,
.no-results-state {
    text-align: center;
    padding: var(--spacing-12) var(--spacing-6);
    background: var(--color-bg-primary);
    border-radius: var(--border-radius-lg);
    border: 2px dashed var(--color-gray-300);
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-gray-200);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    margin: 0 auto var(--spacing-4);
    animation: spin 1s linear infinite;
}

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

.no-results-icon {
    color: var(--color-gray-400);
    margin-bottom: var(--spacing-4);
}

.loading-state p,
.no-results-state h3,
.no-results-state p {
    color: var(--color-text-secondary);
    margin: 0;
}

.no-results-state h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2);
}

/* ======================================
   GRID DE RESULTADOS
   ====================================== */

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-6);
    margin-bottom: var(--spacing-8);
}

/* ======================================
   CARD DE PRODUTO
   ====================================== */

.product-card {
    background: var(--color-bg-primary);
    border-radius: var(--border-radius-xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-gray-200);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    opacity: 0;
    transition: opacity var(--transition-base);
}

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

.product-card:hover::before {
    opacity: 1;
}

.product-card__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-4);
}

.product-card__category {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    background: var(--color-gray-100);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.product-card__ncm {
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-lighter);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--border-radius-sm);
}

.product-card__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-3);
    line-height: 1.4;
}

.product-card__description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin-bottom: var(--spacing-4);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-card__details {
    border-top: 1px solid var(--color-gray-200);
    padding-top: var(--spacing-4);
}

.product-card__taxes {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-4);
}

.tax-item {
    flex: 1;
    text-align: center;
    padding: var(--spacing-3);
    background: var(--color-gray-50);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--color-gray-200);
}

.tax-item__label {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-1);
}

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

.tax-item__value.zero {
    color: var(--color-secondary);
}

.product-card__actions {
    display: flex;
    gap: var(--spacing-3);
}

.btn {
    padding: var(--spacing-3) var(--spacing-4);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--color-gray-100);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover {
    background: var(--color-gray-200);
    transform: translateY(-1px);
}

/* ======================================
   FOOTER
   ====================================== */

.footer {
    background: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--spacing-12) 0 var(--spacing-6);
    margin-top: auto;
}

.footer__content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.footer__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: white;
    margin-bottom: var(--spacing-4);
}

.footer__text {
    line-height: 1.6;
    color: var(--color-gray-400);
}

.footer__links {
    list-style: none;
}

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

.footer__links a {
    color: var(--color-gray-400);
    text-decoration: none;
    transition: color var(--transition-base);
}

.footer__links a:hover {
    color: var(--color-primary-light);
}

.footer__bottom {
    border-top: 1px solid var(--color-gray-700);
    padding-top: var(--spacing-6);
    text-align: center;
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
}

/* ======================================
   RESPONSIVE DESIGN
   ====================================== */

@media (max-width: 768px) {
    .header {
        padding: var(--spacing-6) 0;
    }
    
    .header__title {
        font-size: var(--font-size-3xl);
    }
    
    .search-card {
        padding: var(--spacing-6);
    }
    
    .search-card__title {
        font-size: var(--font-size-xl);
    }
    
    .results-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
    }
    
    .product-card__taxes {
        flex-direction: column;
        gap: var(--spacing-3);
    }
    
    .product-card__actions {
        flex-direction: column;
    }
    
    .quick-filters__buttons {
        justify-content: center;
    }
    
    .footer__content {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--spacing-3);
    }
    
    .search-card {
        padding: var(--spacing-4);
    }
    
    .search-input {
        font-size: var(--font-size-base);
        padding: var(--spacing-3);
    }
    
    .search-button {
        position: static;
        transform: none;
        margin-top: var(--spacing-3);
        width: 100%;
        justify-content: center;
    }
    
    .search-input-group {
        flex-direction: column;
        align-items: stretch;
    }
}

/* ======================================
   DARK MODE SUPPORT
   ====================================== */

@media (prefers-color-scheme: dark) {
    :root {
        --color-text-primary: #f9fafb;
        --color-text-secondary: #d1d5db;
        --color-text-muted: #6b7280;
        --color-bg-primary: #111827;
        --color-bg-secondary: #1f2937;
        --color-bg-tertiary: #374151;
        --color-gray-50: #111827;
        --color-gray-100: #1f2937;
        --color-gray-200: #374151;
        --color-gray-300: #4b5563;
        --color-gray-400: #6b7280;
        --color-gray-500: #9ca3af;
        --color-gray-600: #d1d5db;
        --color-gray-700: #e5e7eb;
        --color-gray-800: #f3f4f6;
        --color-gray-900: #f9fafb;
    }
    
    body {
        background-color: var(--color-bg-secondary);
    }
    
    .search-card,
    .product-card {
        background: var(--color-bg-primary);
        border-color: var(--color-gray-300);
    }
    
    .search-input-group {
        background: var(--color-gray-100);
    }
    
    .search-input {
        color: var(--color-text-primary);
    }
    
    .filter-btn {
        background: var(--color-gray-100);
        border-color: var(--color-gray-300);
        color: var(--color-text-secondary);
    }
    
    .filter-btn:hover {
        background: var(--color-primary);
        color: white;
    }
}

/* ======================================
   ANIMAÇÕES E MICRO-INTERAÇÕES
   ====================================== */

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

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

.product-card {
    animation: fadeIn 0.5s ease-out forwards;
}

.product-card:nth-child(2) {
    animation-delay: 0.1s;
}

.product-card:nth-child(3) {
    animation-delay: 0.2s;
}

.search-input-group:focus-within {
    animation: slideIn 0.3s ease-out;
}

/* ======================================
   PERFORMANCE E OTIMIZAÇÕES
   ====================================== */

.product-card__description {
    contain: layout style;
}

.results-grid {
    contain: layout style;
}

.search-input {
    will-change: transform;
}

.search-button {
    will-change: transform;
}

/* ======================================
   PRINT STYLES
   ====================================== */

@media print {
    .header,
    .footer,
    .search-form,
    .quick-filters,
    .product-card__actions,
    .loading-state,
    .no-results-state {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .product-card {
        break-inside: avoid;
        box-shadow: none !important;
        border: 1px solid #ccc !important;
        margin-bottom: 1rem !important;
    }
    
    .results-grid {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }
    
    .search-section {
        padding: 1rem 0 !important;
    }
    
    .results-title {
        font-size: 1.2rem !important;
        margin-bottom: 1rem !important;
    }
}

/* ======================================
   PERFORMANCE CRÍTICA - ACIMA DA DOBRA
   ====================================== */

/* Estilos críticos inline para performance máxima */
.header {
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: white;
    padding: 2rem 0;
}

.header__title {
    font-size: 2.25rem;
    font-weight: 700;
    margin: 0;
}

.search-card {
    background: white;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    border: 1px solid #e5e7eb;
}

.search-input {
    flex: 1;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    border: none;
    background: transparent;
    outline: none;
    min-height: 56px;
}

.search-button {
    background: #2563eb;
    color: white;
    border: none;
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.search-button:hover {
    background: #1d4ed8;
}

/* ======================================
   OTIMIZAÇÕES DE PERFORMANCE
   ====================================== */

/* Reduzir repaints e reflows */
.product-card,
.search-input-group,
.filter-btn {
    transform: translateZ(0);
    will-change: transform;
}

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

/* Lazy loading para imagens (quando houver) */
img[loading="lazy"] {
    transition: opacity 0.3s ease;
}

/* Cache de conteúdo */
.results-grid {
    content-visibility: auto;
    contain-intrinsic-size: auto 400px;
}

/* ======================================
   MELHORIAS DE ACESSIBILIDADE
   ====================================== */

/* Focus visible para navegação por teclado */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Indicadores de foco melhorados */
.search-input:focus-visible,
.search-button:focus-visible,
.filter-btn:focus-visible,
.btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Suporte para alto contraste */
@media (prefers-contrast: high) {
    :root {
        --color-text-primary: #000;
        --color-text-secondary: #333;
        --color-bg-primary: #fff;
        --color-bg-secondary: #f5f5f5;
    }
    
    .search-card,
    .product-card {
        border-width: 2px;
    }
}

/* Tamanhos de fonte ajustáveis */
@media (min-width: 768px) {
    html {
        font-size: calc(16px + 0.2vw);
    }
}

/* Suporte para dislexia (fonte mais legível) */
@media (prefers-reduced-motion: reduce) {
    body {
        font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
        letter-spacing: 0.01em;
    }
}