/* ===========================================
   Estilos personalizados complementarios a Tailwind
   con metodología BEM (Block, Element, Modifier)
   =========================================== */

/* Variables CSS para sistema de diseño coherente */
:root {
    /* Paleta de colores principal */
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    
    /* Colores de acento */
    --color-accent-primary: #2dd4bf;
    --color-accent-secondary: #38bdf8;
    --color-accent-tertiary: #f472b6;
    
    /* Gradientes */
    --gradient-blue: linear-gradient(135deg, #38bdf8, #2dd4bf);
    --gradient-purple: linear-gradient(135deg, #c084fc, #f472b6);
    --gradient-amber: linear-gradient(135deg, #fb923c, #facc15);
    
    /* Sombras */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 15px rgba(45, 212, 191, 0.5);
    
    /* Tipografía */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-loose: 1.8;
    
    /* Espaciado */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Bordes */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
    
    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Estilos base */
body {
    background-color: var(--color-bg-primary);
    font-family: var(--font-primary);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    color: #ffffff;
}

/* ===========================================
   Animaciones y efectos
   =========================================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulseGlow {
    0% { box-shadow: 0 0 0 0 rgba(45, 212, 191, 0.5); }
    70% { box-shadow: 0 0 0 10px rgba(45, 212, 191, 0); }
    100% { box-shadow: 0 0 0 0 rgba(45, 212, 191, 0); }
}

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

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Bloque: animation */
.animation--fade-in {
    animation: fadeIn var(--transition-normal) forwards;
}

.animation--pulse-glow {
    animation: pulseGlow 2s infinite;
}

.animation--shimmer {
    background: linear-gradient(90deg, 
                rgba(255,255,255,0) 0%, 
                rgba(255,255,255,0.05) 50%, 
                rgba(255,255,255,0) 100%);
    background-size: 200% 100%;
    animation: shimmer 2.5s infinite;
}

.animation--float {
    animation: float 4s ease-in-out infinite;
}

/* Soporte para personas que prefieren reducir el movimiento */
@media (prefers-reduced-motion: reduce) {
    .animation--fade-in,
    .animation--pulse-glow,
    .animation--shimmer,
    .animation--float,
    .service,
    .service::after,
    .certification::before,
    .certification__content,
    .certification__icon,
    .scroll-button,
    .scroll-button::after,
    .scroll-button__icon {
        animation: none !important;
        transition: none !important;
        transform: none !important;
    }
    
    body {
        scroll-behavior: auto;
    }
}

/* ===========================================
   Mejoras de accesibilidad y usabilidad
   =========================================== */
/* Mejorar el aspecto de los inputs en focus */
.form__input:focus, 
.form__textarea:focus,
.form__select:focus {
    border-color: rgba(45, 212, 191, 0.5) !important;
    box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.2);
    outline: none; /* El outline personalizado está abajo */
}

/* Mejorar la accesibilidad con outlines visibles */
.interactive:focus, 
a:focus, 
button:focus,
[role="button"]:focus,
[tabindex]:focus {
    outline: 2px solid rgba(45, 212, 191, 0.5);
    outline-offset: 2px;
}

/* Mejorar la apariencia de elementos seleccionables */
::selection {
    background-color: rgba(45, 212, 191, 0.2);
    color: white;
}

/* ===========================================
   Barras de desplazamiento personalizadas
   =========================================== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    border: 2px solid var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(45, 212, 191, 0.5);
}

/* También añadir soporte para Firefox */
* {
    scrollbar-color: var(--color-accent-primary) var(--color-bg-secondary);
    scrollbar-width: thin;
}

/* ===========================================
   Componentes con BEM
   =========================================== */
/* Bloque: header */
.header {
    position: fixed;
    width: 100%;
    background-color: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    z-index: 50;
}

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

/* Bloque: menu */
.menu {
    transition: clip-path var(--transition-normal);
    clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
    background-color: var(--color-bg-secondary);
    position: absolute;
    width: 100%;
    top: 100%;
    left: 0;
}

.menu--open {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

/* Bloque: section */
.section {
    padding-top: 6rem;
    padding-bottom: 6rem;
    position: relative;
    overflow: hidden;
}

.section:nth-child(odd) {
    background-color: var(--color-bg-primary);
}

.section:nth-child(even) {
    background-color: var(--color-bg-secondary);
}

/* Bloque: button */
.button {
    display: inline-block;
    background: var(--gradient-blue);
    color: white;
    font-weight: var(--font-weight-medium);
    transition: transform var(--transition-normal), filter var(--transition-normal);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(rgba(255,255,255,0.1), rgba(255,255,255,0));
    z-index: -1;
}

.button:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

.button:active {
    transform: translateY(1px);
}

.button--secondary {
    background: transparent;
    border: 1px solid rgba(45, 212, 191, 0.3);
}

.button--secondary:hover {
    background-color: rgba(45, 212, 191, 0.1);
    border-color: rgba(45, 212, 191, 0.5);
}

/* Bloque: link */
.link {
    color: var(--color-accent-primary);
    transition: color var(--transition-fast);
}

.link:hover {
    color: var(--color-accent-secondary);
    text-decoration: none;
}

/* Bloque: service */
.service {
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.service::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-blue);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

.service:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(45, 212, 191, 0.1);
}

.service:hover::after {
    transform: scaleX(1);
}

.service__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-md);
    background: var(--color-bg-tertiary);
    margin-bottom: var(--space-md);
    color: var(--color-accent-primary);
    filter: drop-shadow(0 0 10px rgba(45, 212, 191, 0.3));
}

.service__title {
    font-weight: var(--font-weight-bold);
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.02em;
}

.service__description {
    color: rgba(255, 255, 255, 0.7);
    line-height: var(--line-height-loose);
}

/* Bloque: text-gradient */
.text-gradient {
    -webkit-background-clip: text !important;
    background-clip: text !important;
    color: transparent !important;
    position: relative;
    display: inline-block;
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.03em;
    text-shadow: none !important;
    position: relative;
    z-index: 5;
}

.text-gradient--blue {
    background-image: var(--gradient-blue) !important;
}

.text-gradient--purple {
    background-image: var(--gradient-purple) !important;
}

.text-gradient--amber {
    background-image: var(--gradient-amber) !important;
}

.text-gradient::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: inherit;
    opacity: 0.5;
    border-radius: var(--radius-full);
}
/* ===========================================
   Efectos 3D y tarjetas
   =========================================== */
/* Bloque: certification */
.certification {
    transform-style: preserve-3d;
    perspective: 1000px;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: var(--shadow-md);
}

.certification::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(
        transparent, 
        rgba(45, 212, 191, 0.1), 
        transparent 30%
    );
    opacity: 0;
    transition: opacity var(--transition-slow);
    animation: rotate 4s linear infinite;
    z-index: 1;
    pointer-events: none;
}

.certification:hover::before {
    opacity: 1;
}

.certification__content {
    position: relative;
    z-index: 2;
    transition: transform var(--transition-slow);
    background-color: var(--color-bg-tertiary);
    padding: var(--space-lg);
    border-radius: calc(var(--radius-md) - 1px);
}

.certification__icon {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 3rem;
    height: 3rem;
    opacity: 0.5;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.certification:hover .certification__icon {
    opacity: 1;
    transform: scale(1.1);
}

.certification:hover .certification__content {
    transform: translateZ(20px) rotateY(5deg);
    box-shadow: var(--shadow-lg);
}

.certification__title {
    font-weight: var(--font-weight-bold);
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
    color: var(--color-accent-primary);
}

.certification__date {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: var(--space-lg);
    display: block;
}

.certification__description {
    color: rgba(255, 255, 255, 0.8);
    line-height: var(--line-height-normal);
    position: relative;
}

/* ===========================================
   Componentes de UI específicos
   =========================================== */
/* Bloque: scroll-button (botón volver arriba) */
.scroll-button {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    background: var(--gradient-blue);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: all var(--transition-normal);
    transform: translateY(20px) scale(0.9);
    z-index: 40;
    box-shadow: var(--shadow-glow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
}

.scroll-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0));
    z-index: -1;
}

.scroll-button::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 150%;
    height: 150%;
    background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
    transform: translate(-50%, -50%) scale(0);
    transition: transform var(--transition-fast);
}

.scroll-button--visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.scroll-button:hover {
    filter: brightness(1.1) contrast(1.1);
    transform: translateY(-5px) scale(1.05);
}

.scroll-button:hover::after {
    transform: translate(-50%, -50%) scale(1);
}

.scroll-button:active {
    transform: translateY(0) scale(0.95);
}

.scroll-button__icon {
    font-size: 1.25rem;
    transition: transform var(--transition-fast);
}

.scroll-button:hover .scroll-button__icon {
    transform: translateY(-3px);
}

/* ===========================================
   Formularios
   =========================================== */
.form__input,
.form__textarea,
.form__select {
    background-color: var(--color-bg-secondary);
    border: 1px solid rgba(45, 212, 191, 0.2);
    color: #ffffff;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form__input:hover,
.form__textarea:hover,
.form__select:hover {
    border-color: rgba(45, 212, 191, 0.3);
}

/* ===========================================
   Notificaciones
   =========================================== */
.notification {
    position: fixed;
    top: var(--space-xl);
    right: var(--space-lg);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    color: white;
    z-index: 50;
    max-width: 24rem;
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    opacity: 0;
    transition: all 0.3s ease;
}

.notification--success {
    background: var(--gradient-blue);
}

.notification--error {
    background: linear-gradient(135deg, #f43f5e, #e11d48);
}

.notification--info {
    background: linear-gradient(135deg, #0ea5e9, #0284c7);
}

/* ===========================================
   Footer
   =========================================== */
.footer {
    background-color: var(--color-bg-primary);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* ===========================================
   Media Queries
   =========================================== */
@media (max-width: 768px) {
    :root {
        --space-lg: 1rem;
        --space-xl: 1.5rem;
        --space-2xl: 2rem;
    }

    .section {
        padding-top: 4rem;
        padding-bottom: 4rem;
    }
    
    .text-gradient {
        font-size: 1.5rem;
    }
    
    .service,
    .certification {
        margin-bottom: var(--space-lg);
    }
    
    .scroll-button {
        width: 40px;
        height: 40px;
        bottom: var(--space-md);
        right: var(--space-md);
    }
}