/* =============================================================
   SISTEMA DE DISEÑO — Landing Page B2B
   Servicios de Ingeniería Multidisciplinaria
   
   Arquitectura CSS:
   1. Variables / Tokens de diseño
   2. Reset & Base
   3. Utilidades
   4. Layout (Container)
   5. Header & Navegación
   6. Hero Section
   7. Sección de Servicios
   8. Sección de Contacto
   9. Footer
   10. Animaciones & Keyframes
   11. Media Queries (Responsividad)
============================================================= */


/* =============================================================
   1. VARIABLES / TOKENS DE DISEÑO
   Paleta de colores, tipografía, espaciado, bordes, sombras
   y transiciones centralizadas para consistencia global.
============================================================= */
:root {
    /* --- Colores primarios (dark theme industrial) --- */
    --color-bg-primary:      #060918;       /* Fondo principal: azul muy oscuro */
    --color-bg-secondary:    #0c1029;       /* Fondo secundario: navy profundo */
    --color-bg-tertiary:     #111638;       /* Fondo terciario: para tarjetas */
    --color-bg-glass:        rgba(17, 22, 56, 0.6); /* Fondo glassmorphism */
    
    /* --- Colores de acento --- */
    --color-accent-primary:  #3b82f6;       /* Azul eléctrico principal */
    --color-accent-hover:    #2563eb;       /* Azul hover (más intenso) */
    --color-accent-cyan:     #06b6d4;       /* Cyan para gradientes */
    --color-accent-purple:   #8b5cf6;       /* Púrpura para variaciones */
    --color-accent-amber:    #f59e0b;       /* Ámbar para badges/acentos cálidos */
    
    /* --- Gradientes --- */
    --gradient-primary:      linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-cyan));
    --gradient-hero:         linear-gradient(135deg, #060918 0%, #0c1029 40%, #111638 100%);
    --gradient-text:         linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-cyan), var(--color-accent-purple));
    --gradient-card-border:  linear-gradient(135deg, rgba(59, 130, 246, 0.3), rgba(6, 182, 212, 0.1), rgba(139, 92, 246, 0.3));
    
    /* --- Textos --- */
    --color-text-primary:    #f1f5f9;       /* Texto principal: blanco cálido */
    --color-text-secondary:  #94a3b8;       /* Texto secundario: gris azulado */
    --color-text-muted:      #64748b;       /* Texto silenciado */
    --color-text-accent:     var(--color-accent-primary);
    
    /* --- Bordes --- */
    --color-border:          rgba(59, 130, 246, 0.15); /* Borde sutil azul */
    --color-border-hover:    rgba(59, 130, 246, 0.4);  /* Borde hover */
    
    /* --- Tipografía --- */
    --font-family:           'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs:          0.75rem;       /* 12px */
    --font-size-sm:          0.875rem;      /* 14px */
    --font-size-base:        1rem;          /* 16px */
    --font-size-md:          1.125rem;      /* 18px */
    --font-size-lg:          1.25rem;       /* 20px */
    --font-size-xl:          1.5rem;        /* 24px */
    --font-size-2xl:         2rem;          /* 32px */
    --font-size-3xl:         2.5rem;        /* 40px */
    --font-size-4xl:         3.5rem;        /* 56px */
    --font-size-5xl:         4.5rem;        /* 72px */
    --font-weight-light:     300;
    --font-weight-regular:   400;
    --font-weight-medium:    500;
    --font-weight-semibold:  600;
    --font-weight-bold:      700;
    --font-weight-extrabold: 800;
    --line-height-tight:     1.1;
    --line-height-snug:      1.3;
    --line-height-normal:    1.6;
    --letter-spacing-tight:  -0.02em;
    --letter-spacing-wide:   0.05em;
    
    /* --- Espaciado --- */
    --space-xs:              0.25rem;       /* 4px */
    --space-sm:              0.5rem;        /* 8px */
    --space-md:              1rem;          /* 16px */
    --space-lg:              1.5rem;        /* 24px */
    --space-xl:              2rem;          /* 32px */
    --space-2xl:             3rem;          /* 48px */
    --space-3xl:             4rem;          /* 64px */
    --space-4xl:             6rem;          /* 96px */
    --space-5xl:             8rem;          /* 128px */
    
    /* --- Bordes y radios --- */
    --radius-sm:             0.375rem;      /* 6px */
    --radius-md:             0.75rem;       /* 12px */
    --radius-lg:             1rem;          /* 16px */
    --radius-xl:             1.5rem;        /* 24px */
    --radius-full:           9999px;
    
    /* --- Sombras --- */
    --shadow-sm:             0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md:             0 4px 6px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-lg:             0 10px 25px rgba(0, 0, 0, 0.4), 0 4px 10px rgba(0, 0, 0, 0.2);
    --shadow-xl:             0 20px 50px rgba(0, 0, 0, 0.5), 0 8px 20px rgba(0, 0, 0, 0.3);
    --shadow-glow:           0 0 30px rgba(59, 130, 246, 0.15);
    --shadow-glow-strong:    0 0 60px rgba(59, 130, 246, 0.25);
    
    /* --- Transiciones --- */
    --transition-fast:       150ms ease;
    --transition-base:       300ms ease;
    --transition-slow:       500ms ease;
    --transition-spring:     500ms cubic-bezier(0.34, 1.56, 0.64, 1);
    
    /* --- Z-index scale --- */
    --z-base:                1;
    --z-header:              100;
    --z-overlay:             200;
    --z-modal:               300;
    
    /* --- Dimensiones del header --- */
    --header-height:         4.5rem;        /* 72px */
}


/* =============================================================
   2. RESET & BASE
   Normalización moderna del navegador y estilos base globales.
============================================================= */

/* --- Box model universal --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* --- HTML & Body --- */
html {
    font-size: 100%;                        /* 16px base */
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* --- Tipografía base --- */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    letter-spacing: var(--letter-spacing-tight);
    color: var(--color-text-primary);
}

p {
    color: var(--color-text-secondary);
    line-height: var(--line-height-normal);
}

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

a:hover {
    color: var(--color-accent-cyan);
}

a:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

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

ul, ol {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}

button:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* --- Selección de texto --- */
::selection {
    background-color: rgba(59, 130, 246, 0.3);
    color: var(--color-text-primary);
}


/* =============================================================
   3. UTILIDADES
   Clases reutilizables para estados de visibilidad.
============================================================= */

/* Ocultar visualmente pero mantener accesible para screen readers */
.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;
}


/* =============================================================
   4. LAYOUT — Container
   Contenedor centrado con ancho máximo y padding lateral.
============================================================= */
.container {
    width: 100%;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
}


/* =============================================================
   5. HEADER & NAVEGACIÓN
   Barra de navegación fija, transparente al inicio y sólida
   al hacer scroll (clase .scrolled añadida por JS).
============================================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: var(--z-header);
    transition: background-color var(--transition-base),
                box-shadow var(--transition-base),
                backdrop-filter var(--transition-base);
}

/* Header con fondo sólido al hacer scroll */
.header.scrolled {
    background-color: rgba(6, 9, 24, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 var(--color-border),
                var(--shadow-md);
}

/* --- Nav container --- */
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* --- Logo --- */
.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    text-decoration: none;
    transition: opacity var(--transition-fast);
    z-index: calc(var(--z-header) + 1);
}

.nav__logo:hover {
    opacity: 0.85;
    color: var(--color-text-primary);
}

.nav__logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    color: var(--color-accent-primary);
}

.nav__logo-icon svg {
    width: 100%;
    height: 100%;
}

.nav__logo-accent {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* --- Menú de navegación --- */
.nav__menu {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav__link {
    position: relative;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    padding: var(--space-xs) 0;
    transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link.active {
    color: var(--color-text-primary);
}

/* Indicador activo: línea inferior animada */
.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

.nav__link:hover::after,
.nav__link.active::after {
    width: 100%;
}

/* --- Botón hamburguesa (oculto en desktop) --- */
.nav__toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 30px;
    height: 30px;
    z-index: calc(var(--z-header) + 1);
}

.nav__toggle-bar {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text-primary);
    border-radius: var(--radius-full);
    transition: transform var(--transition-base),
                opacity var(--transition-base);
    transform-origin: center;
}

/* Estado activo del hamburguesa: X animada */
.nav__toggle.active .nav__toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav__toggle.active .nav__toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav__toggle.active .nav__toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}


/* =============================================================
   6. HERO SECTION
   Sección de impacto visual con canvas animado de fondo,
   propuesta de valor, CTAs e indicadores de confianza.
============================================================= */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    overflow: hidden;
    padding-top: var(--header-height);
}

/* Canvas para la animación de partículas/grid */
.hero__canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-base);
    opacity: 0.4;
    will-change: transform;
    transform: translateZ(0);
}

/* Overlay de gradiente sobre el canvas */
.hero__overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 80%, rgba(6, 182, 212, 0.06) 0%, transparent 50%);
    z-index: calc(var(--z-base) + 1);
}

/* Contenido del Hero */
.hero__content {
    position: relative;
    z-index: calc(var(--z-base) + 2);
    text-align: center;
    padding: var(--space-3xl) 0;
}

/* Badge superior */
.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-lg);
    background: var(--color-bg-glass);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    margin-bottom: var(--space-xl);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.hero__badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent-primary);
    border-radius: var(--radius-full);
    animation: pulse-dot 2s ease-in-out infinite;
}

/* Título principal */
.hero__title {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-extrabold);
    line-height: var(--line-height-tight);
    letter-spacing: var(--letter-spacing-tight);
    margin-bottom: var(--space-lg);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero__title-gradient {
    display: block;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% 200%;
    animation: gradient-shift 6s ease-in-out infinite;
}

/* Subtítulo */
.hero__subtitle {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
    line-height: var(--line-height-normal);
}

/* Grupo de CTAs */
.hero__cta-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-3xl);
    flex-wrap: wrap;
}

/* --- Botones reutilizables --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn--primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow-strong);
    color: white;
}

.btn--primary:active {
    transform: translateY(0);
}

.btn--outline {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.btn--outline:hover {
    border-color: var(--color-border-hover);
    color: var(--color-text-primary);
    background: rgba(59, 130, 246, 0.05);
}

.btn--full {
    width: 100%;
}

.btn__icon {
    flex-shrink: 0;
    transition: transform var(--transition-base);
}

.btn:hover .btn__icon {
    transform: translateX(3px);
}

/* Indicadores de confianza / pilares */
.hero__trust {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.hero__trust-pill {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    background: var(--color-bg-glass);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: border-color var(--transition-base), transform var(--transition-base);
}

.hero__trust-pill:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-1px);
}

.hero__trust-icon {
    color: var(--color-accent-cyan);
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
}

.hero__trust-text {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
}

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

.hero__trust-number {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-extrabold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: var(--space-xs);
}

.hero__trust-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
}

.hero__trust-divider {
    width: 1px;
    height: 24px;
    background: var(--color-border);
}

/* Indicador de scroll */
.hero__scroll-indicator {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: calc(var(--z-base) + 2);
    animation: bounce-subtle 2s ease-in-out infinite;
}

.hero__scroll-mouse {
    width: 24px;
    height: 38px;
    border: 2px solid var(--color-border);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.hero__scroll-wheel {
    width: 3px;
    height: 8px;
    background: var(--color-accent-primary);
    border-radius: var(--radius-full);
    animation: scroll-wheel 2s ease-in-out infinite;
}


/* =============================================================
   7. SECCIÓN DE SERVICIOS
   Grid responsivo de tarjetas con glassmorphism y hover effects.
============================================================= */
.servicios {
    padding: var(--space-5xl) 0;
    background: var(--color-bg-secondary);
    position: relative;
}

/* Decoración de fondo sutil */
.servicios::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border), transparent);
}

/* --- Encabezado de sección (reutilizable) --- */
.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-header__tag {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-accent-primary);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    margin-bottom: var(--space-md);
    padding: var(--space-xs) var(--space-md);
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-full);
}

.section-header__title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-extrabold);
    margin-bottom: var(--space-md);
}

.section-header__description {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* --- Grid de servicios --- */
.servicios__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

/* --- Tarjeta de servicio --- */
.service-card {
    position: relative;
    background: var(--color-bg-glass);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform var(--transition-base),
                border-color var(--transition-base),
                box-shadow var(--transition-base);
    overflow: hidden;
}

/* Efecto de brillo superior en hover */
.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.service-card:hover {
    transform: translateY(-6px);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

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

/* Wrapper del ícono */
.service-card__icon-wrapper {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    transition: background var(--transition-base),
                border-color var(--transition-base);
}

.service-card:hover .service-card__icon-wrapper {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.3);
}

.service-card__icon {
    width: 28px;
    height: 28px;
    color: var(--color-accent-primary);
    transition: color var(--transition-base);
}

.service-card:hover .service-card__icon {
    color: var(--color-accent-cyan);
}

/* Título de tarjeta */
.service-card__title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-md);
}

/* Descripción de tarjeta */
.service-card__description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-normal);
    margin-bottom: var(--space-lg);
}

/* Tag de categoría */
.service-card__tag {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-accent-cyan);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    padding: var(--space-xs) var(--space-sm);
    background: rgba(6, 182, 212, 0.08);
    border-radius: var(--radius-sm);
}


/* =============================================================
   8. SECCIÓN DE CONTACTO
   Layout en 2 columnas: formulario + info directa.
============================================================= */
.contacto {
    padding: var(--space-5xl) 0;
    background: var(--color-bg-primary);
    position: relative;
}

.contacto::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border), transparent);
}

/* Layout de contacto: 2 columnas */
.contacto__layout {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--space-3xl);
    align-items: start;
}

/* --- Formulario --- */
.contacto__form {
    background: var(--color-bg-glass);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* Grupo de campo */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-group:last-of-type {
    margin-bottom: var(--space-xl);
}

.form-group__label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.form-group__input {
    width: 100%;
    padding: var(--space-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    transition: border-color var(--transition-fast),
                box-shadow var(--transition-fast);
}

.form-group__input::placeholder {
    color: var(--color-text-muted);
}

.form-group__input:focus {
    outline: none;
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* Estado de error del input */
.form-group__input.error {
    border-color: #ff8a8a;
    box-shadow: 0 0 0 3px rgba(255, 138, 138, 0.15);
}

/* Textarea */
.form-group__textarea {
    resize: vertical;
    min-height: 120px;
}

/* Mensaje de error */
.form-group__error {
    display: block;
    font-size: var(--font-size-xs);
    color: #ff8a8a;
    margin-top: var(--space-xs);
    min-height: 1em;
    transition: opacity var(--transition-fast);
}

/* Estado de envío del formulario (Google Forms / Fallback mailto) */
.form-status {
    font-size: var(--font-size-sm);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    display: none;
    text-align: center;
    font-weight: var(--font-weight-medium);
}

.form-status.success {
    display: block;
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: #10b981;
}

.form-status.error {
    display: block;
    background-color: rgba(255, 138, 138, 0.1);
    border: 1px solid rgba(255, 138, 138, 0.2);
    color: #ff8a8a;
}

/* Contenedor del Iframe alternativo de Google Forms */
.contacto__iframe-wrapper {
    width: 100%;
    background: var(--color-bg-glass);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    overflow: hidden;
    display: none;
    justify-content: center;
}

.contacto__iframe-wrapper iframe {
    width: 100%;
    max-width: 640px;
    height: 700px;
    border: none;
    border-radius: var(--radius-md);
    background: #ffffff; /* Evita parpadeos oscuros */
}

/* --- Información de contacto directo --- */
.contacto__info {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

/* Tarjeta de info de contacto */
.contact-info-card {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--color-bg-glass);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: border-color var(--transition-base),
                transform var(--transition-base);
}

.contact-info-card:hover {
    border-color: var(--color-border-hover);
    transform: translateX(4px);
}

.contact-info-card__icon-wrapper {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(59, 130, 246, 0.1);
    border-radius: var(--radius-md);
}

.contact-info-card__icon {
    width: 20px;
    height: 20px;
    color: var(--color-accent-primary);
}

.contact-info-card__title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-xs);
}

.contact-info-card__link {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.contact-info-card__link:hover {
    color: var(--color-accent-primary);
}

.contact-info-card__text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}


/* =============================================================
   9. FOOTER
   Pie de página con 3 columnas, enlaces y copyright.
============================================================= */
.footer {
    padding: var(--space-3xl) 0 var(--space-xl);
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.footer__grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer__description {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: var(--space-md);
    max-width: 300px;
    line-height: var(--line-height-normal);
}

.footer__heading {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    margin-bottom: var(--space-md);
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer__link {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    transition: color var(--transition-fast),
                padding-left var(--transition-fast);
}

.footer__link:hover {
    color: var(--color-text-primary);
    padding-left: var(--space-xs);
}

.footer__divider {
    border: none;
    height: 1px;
    background: var(--color-border);
    margin-bottom: var(--space-xl);
}

.footer__bottom {
    text-align: center;
}

.footer__copyright {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}


/* =============================================================
   10. ANIMACIONES & KEYFRAMES
   Animaciones para dot-pulse, gradient shift, scroll indicator,
   y reveal de elementos al hacer scroll.
============================================================= */

/* Pulso del badge dot */
@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

/* Shift del gradiente del título */
@keyframes gradient-shift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Bounce sutil del indicador de scroll */
@keyframes bounce-subtle {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* Rueda del mouse scroll indicator */
@keyframes scroll-wheel {
    0% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(6px); }
}

/* --- Scroll-reveal: estados inicial y animado --- */
/* Estado inicial: oculto y desplazado */
[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

/* Estado revelado: visible y en posición */
[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Delays escalonados para el efecto cascade en el grid */
.service-card:nth-child(1) { transition-delay: 0ms; }
.service-card:nth-child(2) { transition-delay: 100ms; }
.service-card:nth-child(3) { transition-delay: 200ms; }
.service-card:nth-child(4) { transition-delay: 300ms; }
.service-card:nth-child(5) { transition-delay: 400ms; }

/* Animación de entrada del hero content */
.hero__content {
    animation: fadeInUp 0.8s ease-out forwards;
}

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


/* =============================================================
   11. MEDIA QUERIES — Responsividad
   Breakpoints: tablet (768px), mobile (480px).
   Adapta grid, tipografía y navegación a pantallas menores.
============================================================= */

/* --- Tablet: max 1024px --- */
@media (max-width: 1024px) {
    .servicios__grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero__title {
        font-size: var(--font-size-3xl);
    }

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

    .footer__grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-xl);
    }
}

/* --- Tablet pequeña / Phablet: max 768px --- */
@media (max-width: 768px) {
    /* Header: mostrar hamburguesa, ocultar menú */
    .nav__toggle {
        display: flex;
    }

    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 300px;
        height: 100vh;
        flex-direction: column;
        justify-content: center;
        gap: var(--space-2xl);
        background: rgba(6, 9, 24, 0.97);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-left: 1px solid var(--color-border);
        transition: right var(--transition-slow);
        z-index: var(--z-header);
        padding: var(--space-2xl);
    }

    .nav__menu.open {
        right: 0;
    }

    .nav__link {
        font-size: var(--font-size-lg);
    }

    /* Hero */
    .hero__title {
        font-size: var(--font-size-2xl);
    }

    .hero__subtitle {
        font-size: var(--font-size-base);
    }

    .hero__cta-group {
        flex-direction: column;
    }

    .hero__cta-group .btn {
        width: 100%;
        justify-content: center;
    }

    .hero__trust {
        gap: var(--space-lg);
    }

    .hero__trust-divider {
        display: none;
    }

    /* Servicios */
    .servicios__grid {
        grid-template-columns: 1fr;
    }

    .section-header__title {
        font-size: var(--font-size-2xl);
    }

    /* Footer */
    .footer__grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer__description {
        margin-left: auto;
        margin-right: auto;
    }
}

/* --- Mobile: max 480px --- */
@media (max-width: 480px) {
    /* Reducir padding del container */
    .container {
        padding-left: var(--space-md);
        padding-right: var(--space-md);
    }

    .hero__title {
        font-size: var(--font-size-xl);
    }

    .hero__trust-number {
        font-size: var(--font-size-xl);
    }

    .service-card {
        padding: var(--space-lg);
    }

    .contacto__form {
        padding: var(--space-lg);
    }
}

/* --- Preferencia de movimiento reducido --- */
@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;
    }

    [data-reveal] {
        opacity: 1;
        transform: none;
    }
}