:root {
    /* Colores primarios UTrust */
    --color-primary: #315789;
    --color-primary-light: #6081ad;
    --color-gray: #899098;
    --color-cream: #f2efeb;
    
    /* Colores secundarios */
    --color-beige: #b69e81;
    --color-cream-dark: #f6e8d2;
    --color-gray-dark: #3e3f40;
    
    /* Colores ResiTrack */
    --color-resitrack-light: #679453;
    --color-resitrack-dark: #0e6614;
    
    /* Tipografía */
    --font-primary: 'Montserrat', sans-serif;
    
    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    /* Bordes */
    --border-radius: 8px;
    --border-radius-lg: 16px;
    
    /* Sombras */
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.15);
    
    /* Transiciones */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset y estilos base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

/* Cursor personalizado */
.cursor {
    position: fixed;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: var(--color-primary);
    mix-blend-mode: difference;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 9999;
    transition: transform 0.1s ease;
}

.cursor-follower {
    position: fixed;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-primary);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 9998;
    transition: transform 0.3s ease, width 0.3s ease, height 0.3s ease;
}

.cursor.hover, .cursor-follower.hover {
    transform: translate(-50%, -50%) scale(1.5);
    background-color: var(--color-resitrack-light);
}

.cursor.click, .cursor-follower.click {
    transform: translate(-50%, -50%) scale(0.8);
}

/* Header y navegación */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #ffffff;
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: background-color var(--transition-normal), padding var(--transition-normal);
}

header.scrolled {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
}

.logo {
    height: 40px;
    transition: height var(--transition-normal);
}

header.scrolled .logo {
    height: 35px;
}

nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

nav a {
    text-decoration: none;
    color: var(--color-gray-dark);
    font-weight: 500;
    position: relative;
    padding: var(--spacing-xs) 0;
    transition: color var(--transition-fast);
}

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

nav a:hover {
    color: var(--color-primary);
}

nav a:hover::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 25px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--color-gray-dark);
    transition: all var(--transition-normal);
}

/* Sección Hero */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    color: white;
    text-align: center;
}

.hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(49, 87, 137, 0.8) 0%, rgba(14, 102, 20, 0.6) 100%);
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    padding: var(--spacing-md);
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 300;
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-resitrack-light);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-normal);
    cursor: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.7s ease;
}

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

.btn:hover::before {
    left: 100%;
}

/* Canvas para efectos 3D */
#hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

/* Secciones generales */
section {
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    font-size: 2.5rem;
    color: var(--color-primary);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--color-resitrack-light);
    border-radius: 2px;
}

/* Sección Quiénes Somos */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.about-card {
    background-color: white;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    opacity: 0;
    transform: translateY(20px);
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.about-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
}

.about-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-resitrack-light);
    transition: transform var(--transition-normal);
}

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

/* Sección ResiTrack */
.resitrack {
    background-color: var(--color-cream-dark);
}

.app-showcase {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-lg);
}

.app-model {
    flex: 1;
    min-width: 300px;
    height: 400px;
    position: relative;
}

#truck-model {
    width: 100%;
    height: 100%;
}

.app-features {
    flex: 1;
    min-width: 300px;
}

.feature-item {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal);
    opacity: 0;
    transform: translateX(-20px);
}

.feature-item:nth-child(even) {
    transform: translateX(20px);
}

.feature-item:hover {
    transform: translateX(0) translateY(-5px);
}

/* Sección Galería */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    aspect-ratio: 16/9;
    cursor: none;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    padding: var(--spacing-md);
    color: white;
    transform: translateY(100%);
    transition: transform var(--transition-normal);
}

.gallery-item:hover .gallery-overlay {
    transform: translateY(0);
}

/* Sección Contacto */
.contact {
    background-color: var(--color-gray-dark);
    color: white;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.contact-form {
    background-color: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    backdrop-filter: blur(10px);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: none;
    border-radius: var(--border-radius);
    background-color: rgba(255, 255, 255, 0.9);
    transition: box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--color-resitrack-light);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.map-container {
    height: 400px;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

#interactive-map {
    width: 100%;
    height: 100%;
}

/* Footer */
footer {
    background-color: var(--color-gray-dark);
    color: white;
    padding: var(--spacing-lg) var(--spacing-md);
}

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

.footer-logo {
    height: 40px;
    margin-bottom: var(--spacing-sm);
}

.footer-heading {
    color: var(--color-cream);
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
    position: relative;
}

.footer-heading::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--color-resitrack-light);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: var(--color-cream);
    text-decoration: none;
    transition: color var(--transition-fast);
    position: relative;
    padding-left: 15px;
}

.footer-links a::before {
    content: '→';
    position: absolute;
    left: 0;
    opacity: 0;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-resitrack-light);
}

.footer-links a:hover::before {
    opacity: 1;
    transform: translateX(3px);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: all var(--transition-normal);
}

.social-link:hover {
    background-color: var(--color-resitrack-light);
    transform: translateY(-3px);
}

.copyright {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    color: var(--color-gray);
}

/* Control de sonido */
.sound-control {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: white;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 100;
    transition: transform var(--transition-normal);
}

.sound-control:hover {
    transform: scale(1.1);
}

.sound-control.muted .sound-on {
    display: none;
}

.sound-control:not(.muted) .sound-off {
    display: none;
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 4rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    nav ul {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 70%;
        flex-direction: column;
        background-color: white;
        padding: var(--spacing-xl) var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transition: right var(--transition-normal);
        z-index: 1000;
    }
    
    nav ul.active {
        right: 0;
    }
    
    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .app-showcase {
        flex-direction: column;
    }
}

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

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

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}