/* ========================================
   VARIABLES Y CONFIGURACIÓN GLOBAL
   ======================================== */

:root {
    /* Colores Primarios */
    --color-dark-1: #1a1a1a;
    --color-dark-2: #2d2d2d;
    --color-dark-3: #3a3a3a;
    --color-dark-4: #4a4a4a;
    
    /* Colores Rojos (Claro) */
    --color-red-primary: #e30613;
    --color-red-dark: #c20510;
    --color-red-light: #ff1f2d;
    --color-red-hover: #ff2f3d;
    
    /* Colores Neutrales */
    --color-white: #ffffff;
    --color-gray-light: #f5f5f5;
    --color-gray-medium: #e0e0e0;
    --color-gray-dark: #666666;
    
    /* Tipografía */
    --font-primary: 'Roboto', 'Arial', sans-serif;
    --font-size-base: 16px;
    --font-size-h1: 2.5rem;
    --font-size-h2: 2rem;
    --font-size-h3: 1.75rem;
    --font-size-h4: 1.25rem;
    --font-size-h5: 1.125rem;
    --font-size-small: 0.875rem;
    
    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Transiciones */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Sombras */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.4);
    
    /* Breakpoints */
    --breakpoint-mobile: 768px;
    --breakpoint-tablet: 1024px;
    
    /* Z-index */
    --z-header: 100;
    --z-modal: 1000;
    --z-lightbox: 1100;
    --z-scroll-top: 500;
}

/* ========================================
   RESET Y ESTILOS BASE
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-dark-1);
    color: var(--color-white);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

button {
    font-family: var(--font-primary);
    cursor: pointer;
    border: none;
    background: none;
    transition: all var(--transition-normal);
}

/* ========================================
   UTILIDADES
   ======================================== */

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

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

/* Loading Spinner */
.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--color-dark-3);
    border-top-color: var(--color-red-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner-small {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-dark-3);
    border-top-color: var(--color-red-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    color: var(--color-gray-dark);
    font-style: italic;
}

/* ========================================
   HEADER
   ======================================== */

.header {
    background-color: var(--color-dark-2);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    box-shadow: var(--shadow-md);
}

.header-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-logo {
    width: 60px;
    height: 60px;
    object-fit: contain;
    border-radius: 8px;
}

.header-title {
    font-size: var(--font-size-h1);
    font-weight: 900;
    color: var(--color-white);
    letter-spacing: 1px;
    text-transform: uppercase;
}

@media (max-width: 768px) {
    .header {
        padding: var(--spacing-sm) 0;
    }
    
    .header-container {
        gap: var(--spacing-sm);
    }
    
    .header-logo {
        width: 45px;
        height: 45px;
    }
    
    .header-title {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .header-title {
        font-size: 1rem;
    }
    
    .header-logo {
        width: 40px;
        height: 40px;
    }
}

/* ========================================
   MAIN CONTENT
   ======================================== */

.main-content {
    min-height: calc(100vh - 200px);
}

/* ========================================
   CITIES SECTION
   ======================================== */

.cities-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-dark-2);
}

.section-title {
    font-size: var(--font-size-h2);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.section-description {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    color: var(--color-gray-medium);
    line-height: 1.8;
    font-size: 1.125rem;
}

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

.cities-loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xxl) 0;
}

.city-card {
    background-color: var(--color-dark-3);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.city-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border: 2px solid var(--color-red-primary);
}

.city-card-image {
    width: 100%;
    height: 350px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.city-card:hover .city-card-image {
    transform: scale(1.1);
}

.city-card-content {
    padding: var(--spacing-md);
}

.city-card-title {
    font-size: var(--font-size-h4);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
}

.city-card-subtitle {
    font-size: var(--font-size-small);
    color: var(--color-red-light);
    font-weight: 500;
}

@media (max-width: 768px) {
    .cities-section {
        padding: var(--spacing-xl) 0;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .section-description {
        font-size: 1rem;
    }
    
    .cities-grid {
        grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
        gap: var(--spacing-md);
    }
    
    .city-card-image {
        height: 350px;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 1.5rem;
    }
    
    .cities-grid {
        grid-template-columns: 1fr;
    }
}

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

.footer {
    background-color: var(--color-dark-3);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    border-top: 3px solid var(--color-red-primary);
}

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

.footer-brand {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.footer-logo {
    width: 80px;
    height: 80px;
    object-fit: contain;
    border-radius: 8px;
}

.footer-info {
    flex: 1;
}

.footer-title {
    font-size: var(--font-size-h4);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-description {
    color: var(--color-gray-medium);
    line-height: 1.6;
    font-size: 0.95rem;
}

.footer-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.social-title {
    font-size: var(--font-size-h5);
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.social-networks {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: flex-end;
}

.social-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.social-link {
    display: block;
    width: 45px;
    height: 45px;
    transition: all var(--transition-normal);
    border-radius: 8px;
    overflow: hidden;
    border: 2px solid transparent;
}

.social-link:hover {
    transform: scale(1.1);
    border-color: var(--color-red-primary);
    box-shadow: 0 0 15px rgba(227, 6, 19, 0.5);
}

.social-icon {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.footer-bottom {
    border-top: 1px solid var(--color-dark-4);
    padding-top: var(--spacing-md);
    text-align: center;
}

.copyright {
    color: var(--color-gray-dark);
    font-size: var(--font-size-small);
    font-weight: 300;
}

@media (max-width: 768px) {
    .footer-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-right {
        align-items: flex-start;
    }
    
    .social-networks {
        justify-content: flex-start;
    }
    
    .footer-brand {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .footer-logo {
        width: 60px;
        height: 60px;
    }
}

@media (max-width: 480px) {
    .footer {
        padding: var(--spacing-lg) 0 var(--spacing-sm);
    }
    
    .footer-title {
        font-size: 1.125rem;
    }
    
    .footer-description {
        font-size: 0.875rem;
    }
    
    .social-link {
        width: 40px;
        height: 40px;
    }
}

/* ========================================
   SCROLL TO TOP BUTTON
   ======================================== */

.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--color-red-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    z-index: var(--z-scroll-top);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-to-top:hover {
    background-color: var(--color-red-hover);
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(227, 6, 19, 0.4);
}

.scroll-to-top:active {
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .scroll-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
}

/* ========================================
   RESPONSIVE UTILITIES
   ======================================== */

@media (max-width: 768px) {
    :root {
        --font-size-h1: 1.8rem;
        --font-size-h2: 1.5rem;
        --font-size-h3: 1.35rem;
        --spacing-xl: 2rem;
        --spacing-xxl: 3rem;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-h1: 1.5rem;
        --font-size-h2: 1.35rem;
        --font-size-h3: 1.2rem;
        --spacing-xl: 1.5rem;
        --spacing-xxl: 2rem;
    }
}