/* ============================================
   BDV Landing Page - Estilos CSS
   Banco de Venezuela - Sitio Informativo
   Última actualización: Octubre 2024
   Optimizado para SEO y Performance
   ============================================ */

/* CSS Variables - Colores Corporativos BDV */
:root {
    /* Colores principales */
    --bdv-red: #E30613;
    --bdv-red-dark: #C40510;
    --bdv-black: #1A1A1A;
    --bdv-gray-dark: #333333;
    --bdv-gray: #666666;
    --bdv-gray-light: #999999;
    --bdv-gray-lighter: #F5F5F5;
    --bdv-white: #FFFFFF;
    
    /* Gradientes */
    --gradient-primary: linear-gradient(135deg, var(--bdv-red) 0%, var(--bdv-red-dark) 100%);
    --gradient-hero: linear-gradient(135deg, #1A1A1A 0%, #2D2D2D 100%);
    
    /* Tipografía */
    --font-primary: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Bordes */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-full: 50px;
    
    /* Sombras */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    
    /* Transiciones */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-header: 1000;
    --z-modal: 2000;
}

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

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

body {
    font-family: var(--font-primary);
    color: var(--bdv-gray-dark);
    background-color: var(--bdv-white);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

/* ============================================
   HEADER / NAVEGACIÓN
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--bdv-white);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-header);
    transition: all var(--transition-normal);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 50px;
    width: auto;
}

.nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    font-weight: 500;
    color: var(--bdv-gray-dark);
    padding: var(--spacing-xs) 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--bdv-red);
    transition: width var(--transition-normal);
}

.nav-link:hover {
    color: var(--bdv-red);
}

.nav-link:hover::after {
    width: 100%;
}

/* Mobile Nav Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.hamburger,
.hamburger::before,
.hamburger::after {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--bdv-gray-dark);
    border-radius: 3px;
    transition: all var(--transition-normal);
}

.hamburger {
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    margin-top: 70px;
    padding: var(--spacing-2xl) 0;
    background: var(--gradient-hero);
    color: var(--bdv-white);
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

/* ============================================
   BOTONES
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--border-radius-full);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--bdv-red-dark);
    border-color: var(--bdv-red-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--bdv-white);
    border-color: var(--bdv-white);
}

.btn-secondary:hover {
    background-color: var(--bdv-white);
    color: var(--bdv-red);
}

.btn-icon {
    transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
    transform: translateX(4px);
}

/* ============================================
   SECCIONES GENERALES
   ============================================ */
.section {
    padding: var(--spacing-2xl) 0;
}

.section:nth-child(even) {
    background-color: var(--bdv-gray-lighter);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--bdv-black);
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.section-description {
    font-size: 1.125rem;
    color: var(--bdv-gray);
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

/* ============================================
   TABS - TRANSACCIONES
   ============================================ */
.tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.tab-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--bdv-white);
    border: 2px solid var(--bdv-gray-lighter);
    border-radius: var(--border-radius-full);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--bdv-gray);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.tab-btn:hover {
    border-color: var(--bdv-red);
    color: var(--bdv-red);
}

.tab-btn.active {
    background-color: var(--bdv-red);
    border-color: var(--bdv-red);
    color: var(--bdv-white);
}

.tab-content {
    background-color: var(--bdv-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.tab-pane {
    display: none;
    padding: var(--spacing-lg);
    animation: fadeIn 0.3s ease;
}

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

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

/* Cards Grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.card {
    background-color: var(--bdv-white);
    border: 1px solid var(--bdv-gray-lighter);
    border-radius: var(--border-radius-md);
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--bdv-red);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--border-radius-md);
    color: var(--bdv-white);
    margin-bottom: var(--spacing-md);
}

.card h3 {
    font-size: 1.25rem;
    color: var(--bdv-black);
    margin-bottom: var(--spacing-xs);
}

.card p {
    color: var(--bdv-gray);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-md);
}

.steps {
    counter-reset: step;
    margin-top: var(--spacing-md);
}

.steps li {
    counter-increment: step;
    position: relative;
    padding-left: 2.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--bdv-gray-dark);
    font-size: 0.875rem;
}

.steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 28px;
    height: 28px;
    background: var(--gradient-primary);
    color: var(--bdv-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

/* ============================================
   SUCURSALES
   ============================================ */
.search-box {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    justify-content: center;
}

.search-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    flex: 1;
    min-width: 200px;
    max-width: 300px;
}

.search-label {
    font-weight: 500;
    color: var(--bdv-gray-dark);
    font-size: 0.875rem;
}

.search-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--bdv-gray-lighter);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    background-color: var(--bdv-white);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.search-select:focus {
    outline: none;
    border-color: var(--bdv-red);
}

.results-container {
    background-color: var(--bdv-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    min-height: 200px;
}

.results-placeholder {
    text-align: center;
    color: var(--bdv-gray);
    padding: var(--spacing-xl);
}

.sucursal-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--bdv-gray-lighter);
    transition: background-color var(--transition-fast);
}

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

.sucursal-item:hover {
    background-color: var(--bdv-gray-lighter);
}

.sucursal-item h4 {
    font-size: 1.125rem;
    color: var(--bdv-black);
}

.sucursal-item p {
    color: var(--bdv-gray);
    font-size: 0.875rem;
}

.sucursal-item .sucursal-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.sucursal-item .btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
}

/* ============================================
   SERVICIOS
   ============================================ */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.service-card {
    background-color: var(--bdv-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.service-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px);
}

.service-icon {
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--border-radius-lg);
    color: var(--bdv-white);
    margin: 0 auto var(--spacing-md);
    transition: transform var(--transition-normal);
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(5deg);
}

.service-card h3 {
    font-size: 1.25rem;
    color: var(--bdv-black);
    margin-bottom: var(--spacing-xs);
}

.service-card p {
    color: var(--bdv-gray);
    font-size: 0.9375rem;
}

/* ============================================
   BDVENLÍNEA
   ============================================ */
.bdvenlinea {
    background: var(--gradient-hero);
    color: var(--bdv-white);
}

.bdvenlinea .section-title,
.bdvenlinea .section-description {
    color: var(--bdv-white);
}

.bdvenlinea-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.features-list {
    margin: var(--spacing-lg) 0;
}

.features-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    font-size: 1rem;
}

.check-icon {
    color: var(--bdv-red);
    flex-shrink: 0;
}

/* Device Mockup */
.device-mockup {
    display: flex;
    justify-content: center;
}

.browser-window {
    width: 100%;
    max-width: 400px;
    background-color: var(--bdv-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.browser-header {
    background-color: var(--bdv-gray-lighter);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.browser-dots {
    display: flex;
    gap: 6px;
}

.browser-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--bdv-gray-light);
}

.browser-dots span:nth-child(1) { background-color: #FF5F56; }
.browser-dots span:nth-child(2) { background-color: #FFBD2E; }
.browser-dots span:nth-child(3) { background-color: #27C93F; }

.browser-url {
    flex: 1;
    background-color: var(--bdv-white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    font-size: 0.75rem;
    color: var(--bdv-gray);
    text-align: center;
}

.browser-content {
    padding: var(--spacing-lg);
    text-align: center;
}

.mockup-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--bdv-red);
    margin-bottom: var(--spacing-lg);
}

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

.mockup-input {
    height: 40px;
    background-color: var(--bdv-gray-lighter);
    border-radius: var(--border-radius-sm);
}

.mockup-btn {
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--border-radius-sm);
}

/* ============================================
   CONTACTO
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.contact-card {
    background-color: var(--bdv-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

.contact-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    color: var(--bdv-white);
    margin: 0 auto var(--spacing-md);
}

.contact-card h3 {
    font-size: 1.25rem;
    color: var(--bdv-black);
    margin-bottom: var(--spacing-md);
}

.contact-info {
    color: var(--bdv-gray);
    font-size: 0.9375rem;
    line-height: 1.8;
}

.contact-info strong {
    color: var(--bdv-black);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background-color: var(--bdv-black);
    color: var(--bdv-white);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    margin-bottom: var(--spacing-md);
    filter: brightness(0) invert(1);
}

.footer-description {
    color: var(--bdv-gray-light);
    font-size: 0.9375rem;
    line-height: 1.6;
}

.footer-section h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: var(--bdv-white);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-links a {
    color: var(--bdv-gray-light);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--bdv-red);
}

.footer-bottom {
    border-top: 1px solid var(--bdv-gray);
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer-bottom p {
    color: var(--bdv-gray-light);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
}

.footer-disclaimer {
    font-size: 0.8125rem;
    opacity: 0.7;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 992px) {
    .bdvenlinea-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .features-list {
        max-width: 500px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .features-list li {
        justify-content: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-list {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--bdv-white);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-sm);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav-list.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        display: block;
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid var(--bdv-gray-lighter);
    }
    
    .nav-link:last-child {
        border-bottom: none;
    }
    
    .hero {
        margin-top: 70px;
        padding: var(--spacing-xl) 0;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .search-box {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-group {
        max-width: none;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-section h4 {
        text-align: center;
    }
    
    .footer-links {
        align-items: center;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
    }
    
    .tabs {
        flex-direction: column;
    }
    
    .tab-btn {
        width: 100%;
    }
    
    .card-grid,
    .services-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   ACCESIBILIDAD
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Focus visible */
:focus-visible {
    outline: 3px solid var(--bdv-red);
    outline-offset: 2px;
}

/* Skip link para accesibilidad */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--bdv-red);
    color: white;
    padding: 0.75rem 1.5rem;
    z-index: 10000;
    text-decoration: none;
    font-weight: 500;
    border-radius: 0 0 4px 0;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
    outline: 3px solid var(--bdv-white);
    outline-offset: 2px;
}

/* Breadcrumbs SEO */
.breadcrumbs {
    position: absolute;
    top: -9999px;
    left: -9999px;
}

/* Visually Hidden (para SEO y accesibilidad) */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Loading Skeleton para LCP */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* Preloader */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bdv-white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.3s, visibility 0.3s;
}

.preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

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

.preloader-logo {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

/* ============================================
   LOADING STATES
   ============================================ */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 24px;
    height: 24px;
    margin: -12px 0 0 -12px;
    border: 3px solid var(--bdv-gray-lighter);
    border-top-color: var(--bdv-red);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .header,
    .hero-buttons,
    .nav-toggle,
    .btn {
        display: none;
    }
    
    .section {
        page-break-inside: avoid;
    }
    
    body {
        color: #000;
        background: #fff;
    }
    
    a {
        text-decoration: underline;
    }
}