/* ===================================
   Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colores Corporativos 4S Multiservices */
    --primary-color: #2B7FB9;      /* Azul del logo */
    --primary-dark: #1e5a8a;       /* Azul más oscuro */
    --secondary-color: #4A4A4A;    /* Gris del logo */
    --accent-color: #5BA3D0;       /* Azul claro */
    --text-dark: #2d2d2d;          /* Texto principal */
    --text-light: #6b7280;         /* Texto secundario */
    --bg-light: #f9fafb;           /* Fondo claro */
    --bg-white: #ffffff;           /* Fondo blanco */
    --border-color: #e5e7eb;       /* Bordes */
    --success-color: #10b981;      /* Verde para éxito */
    --whatsapp-color: #25D366;     /* Verde WhatsApp */

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

html {
    scroll-behavior: smooth;
}

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

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

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-lg);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-img {
    height: 45px;
    width: auto;
    transition: transform var(--transition-base);
    object-fit: contain;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transform: translateX(-50%);
    transition: width var(--transition-base);
}

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

.nav-link:hover::after {
    width: 80%;
}

/* Language Switcher */
.language-switcher {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    margin-left: 1rem;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 0.75rem;
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-dark);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-primary);
}

.lang-btn .flag {
    font-size: 1.125rem;
}

.lang-btn:hover {
    border-color: var(--primary-color);
    background: rgba(43, 127, 185, 0.05);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    transition: all var(--transition-base);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    margin-top: 70px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(96, 165, 250, 0.2) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    padding: var(--spacing-xl) 0;
}

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

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    font-weight: 300;
}

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

/* Animations */
.fade-in {
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}

.fade-in-delay {
    animation: fadeInUp 0.8s ease 0.2s forwards;
    opacity: 0;
}

.fade-in-delay-2 {
    animation: fadeInUp 0.8s ease 0.4s forwards;
    opacity: 0;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: var(--font-primary);
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: var(--primary-color);
    transform: translateY(-2px);
}

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

.btn-whatsapp:hover {
    background: #128C7E;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ===================================
   Section Headers
   =================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   Services Section
   =================================== */
.services {
    padding: var(--spacing-xl) 0;
    background: var(--bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.service-card {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

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

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: white;
    transition: all var(--transition-base);
}

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

.service-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: var(--spacing-sm);
}

.service-description {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.service-features {
    list-style: none;
    margin-top: var(--spacing-md);
}

.service-features li {
    padding: var(--spacing-xs) 0;
    color: var(--text-light);
    position: relative;
    padding-left: 1.5rem;
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* ===================================
   About Section
   =================================== */
.about {
    padding: var(--spacing-xl) 0;
    background: var(--bg-white);
}

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

.about-description {
    color: var(--text-light);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.about-feature {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
}

.feature-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    flex-shrink: 0;
}

.feature-content h4 {
    font-size: 1.125rem;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
}

.feature-content p {
    color: var(--text-light);
}

.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-image-placeholder {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    opacity: 0.1;
}

.about-team-photo {
    width: 100%;
    max-width: 500px;
    height: auto;
    border-radius: 24px;
    box-shadow: var(--shadow-xl);
    object-fit: cover;
    transition: transform var(--transition-base);
}

.about-team-photo:hover {
    transform: scale(1.02);
    box-shadow: 0 25px 35px -5px rgba(0, 0, 0, 0.15);
}

/* ===================================
   Contact Section
   =================================== */
.contact {
    padding: var(--spacing-xl) 0;
    background: var(--bg-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
}

.contact-form {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: var(--font-primary);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.btn-submit {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.form-message {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    display: none;
}

.form-message.success {
    display: block;
    background: #d1fae5;
    color: #065f46;
}

.form-message.error {
    display: block;
    background: #fee2e2;
    color: #991b1b;
}

.contact-info-card {
    background: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    height: fit-content;
}

.contact-info-card h3 {
    font-size: 1.5rem;
    color: var(--text-dark);
    margin-bottom: var(--spacing-md);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.contact-item svg {
    color: var(--primary-color);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--text-dark);
    color: white;
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

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

.footer-section h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.footer-section p {
    color: #9ca3af;
    line-height: 1.7;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #9ca3af;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #9ca3af;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 740px) {
    /* Reducir tamaño del logo en móvil */
    .logo-img {
        height: 30px;
    }

    .nav-content {
        padding: 0.5rem 0;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        display: flex;
    }

    .language-switcher {
        margin-left: 0;
        justify-content: center;
        padding-top: var(--spacing-sm);
        border-top: 1px solid var(--border-color);
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .about-image {
        order: -1;
    }

    .about-image-placeholder {
        width: 100%;
        height: 300px;
    }

    .about-team-photo {
        max-width: 100%;
        border-radius: 16px;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    /* Logo aún más pequeño en pantallas muy pequeñas */
    .logo-img {
        height: 25px;
    }

    .nav-content {
        padding: 0.4rem 0;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }
}

/* ===================================
   Floating WhatsApp Button
   =================================== */
.whatsapp-float {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: var(--whatsapp-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
    z-index: 999;
    cursor: pointer;
    transition: all var(--transition-base);
    animation: pulse-whatsapp 2s infinite;
    text-decoration: none;
}

.whatsapp-float:hover {
    background: #128C7E;
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.6);
}

.whatsapp-float svg {
    width: 32px;
    height: 32px;
}

/* Tooltip */
.whatsapp-tooltip {
    position: absolute;
    right: 75px;
    background: var(--text-dark);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    white-space: nowrap;
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
    transform: translateX(10px);
}

.whatsapp-tooltip::after {
    content: '';
    position: absolute;
    right: -8px;
    top: 50%;
    transform: translateY(-50%);
    border: 4px solid transparent;
    border-left-color: var(--text-dark);
}

.whatsapp-float:hover .whatsapp-tooltip {
    opacity: 1;
    transform: translateX(0);
}

/* Pulse Animation */
@keyframes pulse-whatsapp {
    0%, 100% {
        box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4), 0 0 0 0 rgba(37, 211, 102, 0.7);
    }
    50% {
        box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4), 0 0 0 15px rgba(37, 211, 102, 0);
    }
}

/* Hide on very small screens to avoid blocking content */
@media (max-width: 480px) {
    .whatsapp-float {
        width: 50px;
        height: 50px;
        bottom: 20px;
        right: 20px;
    }

    .whatsapp-float svg {
        width: 26px;
        height: 26px;
    }

    .whatsapp-tooltip {
        display: none;
    }
}

/* ===================================
   Scroll Animations
   =================================== */
.scroll-fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.scroll-fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}