/* ===== LOADER CSS ULTRAMODERNO - TECNÓPOLIS ===== */
/* Archivo: assets/css/loader.css */

:root {
    --loader-primary: #0066B3;
    --loader-secondary: #007BFF;
    --loader-accent: #00D4FF;
    --loader-white: #FFFFFF;
    --loader-bg-overlay: rgba(0, 102, 179, 0.95);
    
    /* Gradientes para loader */
    --gradient-loader: linear-gradient(135deg, var(--loader-primary) 0%, var(--loader-secondary) 50%, var(--loader-accent) 100%);
    --gradient-spinner: conic-gradient(from 0deg, var(--loader-primary), var(--loader-accent), var(--loader-primary));
    
    /* Animaciones timing */
    --loader-duration-fast: 0.8s;
    --loader-duration-medium: 1.2s;
    --loader-duration-slow: 2s;
    
    /* Sombras para loader */
    --loader-shadow-glow: 0 0 30px rgba(0, 212, 255, 0.5);
    --loader-shadow-soft: 0 8px 32px rgba(0, 0, 0, 0.12);
}

/* ===== PRELOADER PRINCIPAL ===== */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-loader);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    z-index: 99999;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

/* Patrón de fondo animado */
#preloader::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(255,255,255,0.1) 2px, transparent 2px),
        radial-gradient(circle at 75% 75%, rgba(255,255,255,0.05) 1px, transparent 1px),
        radial-gradient(circle at 50% 50%, rgba(255,255,255,0.08) 3px, transparent 3px);
    background-size: 60px 60px, 40px 40px, 80px 80px;
    animation: backgroundFloat 20s linear infinite;
    opacity: 0.6;
}

@keyframes backgroundFloat {
    0% {
        transform: translateX(0) translateY(0) rotate(0deg);
    }
    100% {
        transform: translateX(-60px) translateY(-60px) rotate(360deg);
    }
}

/* ===== SPINNER PRINCIPAL ===== */
.spinner {
    width: 120px;
    height: 120px;
    position: relative;
    margin-bottom: 2rem;
    z-index: 2;
}

/* Spinner circular moderno */
.spinner::before,
.spinner::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    animation: spinnerPulse var(--loader-duration-slow) infinite;
}

.spinner::before {
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-spinner);
    animation: spinnerRotate var(--loader-duration-fast) linear infinite;
    opacity: 0.8;
}

.spinner::after {
    top: 10px;
    left: 10px;
    width: calc(100% - 20px);
    height: calc(100% - 20px);
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    animation: spinnerPulse var(--loader-duration-medium) infinite;
    box-shadow: var(--loader-shadow-glow);
}

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

@keyframes spinnerPulse {
    0%, 100% {
        transform: scale(0.8);
        opacity: 0.8;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.4;
    }
}

/* ===== SPINNER ALTERNATIVO (DOTS) ===== */
.spinner.spinner-dots {
    width: 80px;
    height: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.spinner.spinner-dots::before,
.spinner.spinner-dots::after {
    width: 16px;
    height: 16px;
    background: var(--loader-white);
    border-radius: 50%;
    animation: dotsAnimation var(--loader-duration-fast) infinite ease-in-out;
    box-shadow: var(--loader-shadow-soft);
}

.spinner.spinner-dots::before {
    animation-delay: 0s;
}

.spinner.spinner-dots::after {
    animation-delay: 0.3s;
}

/* Dot central para el spinner de dots */
.spinner.spinner-dots {
    position: relative;
}

.spinner.spinner-dots::before {
    content: '';
    position: absolute;
    left: 0;
}

.spinner.spinner-dots::after {
    content: '';
    position: absolute;
    right: 0;
}

/* Crear el dot central con pseudo-elemento adicional */
.spinner.spinner-dots {
    display: block;
}

.spinner.spinner-dots::before,
.spinner.spinner-dots::after {
    content: '';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    background: var(--loader-white);
    border-radius: 50%;
    animation: dotsAnimation var(--loader-duration-fast) infinite ease-in-out;
    box-shadow: var(--loader-shadow-soft);
}

.spinner.spinner-dots::before {
    left: 0;
    animation-delay: 0s;
}

.spinner.spinner-dots::after {
    right: 0;
    animation-delay: 0.4s;
}

/* Dot central usando un pseudo-elemento en el contenedor */
.spinner.spinner-dots {
    position: relative;
}

.spinner.spinner-dots:before {
    left: 50%;
    transform: translateX(-50%) translateY(-50%);
    animation-delay: 0.2s;
}

@keyframes dotsAnimation {
    0%, 60%, 100% {
        transform: translateY(-50%) scale(0.8);
        opacity: 0.5;
    }
    30% {
        transform: translateY(-50%) scale(1.2);
        opacity: 1;
    }
}

/* ===== SPINNER DE BARRAS ===== */
.spinner.spinner-bars {
    width: 60px;
    height: 40px;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.spinner.spinner-bars::before,
.spinner.spinner-bars::after {
    width: 8px;
    background: var(--loader-white);
    border-radius: 4px;
    animation: barsAnimation var(--loader-duration-fast) infinite ease-in-out;
    box-shadow: var(--loader-shadow-soft);
}

.spinner.spinner-bars::before {
    height: 40px;
    animation-delay: 0s;
}

.spinner.spinner-bars::after {
    height: 30px;
    animation-delay: 0.2s;
}

@keyframes barsAnimation {
    0%, 40%, 100% {
        transform: scaleY(0.4);
        opacity: 0.5;
    }
    20% {
        transform: scaleY(1);
        opacity: 1;
    }
}

/* ===== LOGO DEL PRELOADER ===== */
.preloader-logo {
    z-index: 3;
    position: relative;
}

.preloader-logo img {
    max-height: 120px;
    width: auto;
    filter: brightness(0) invert(1);
    animation: logoFloat var(--loader-duration-slow) ease-in-out infinite;
    drop-shadow: var(--loader-shadow-soft);
}

@keyframes logoFloat {
    0%, 100% {
        transform: translateY(0px) scale(1);
    }
    50% {
        transform: translateY(-15px) scale(1.05);
    }
}

/* ===== TEXTO DE CARGA ===== */
.preloader-text {
    color: var(--loader-white);
    font-size: 18px;
    font-weight: 600;
    margin-top: 1rem;
    text-align: center;
    opacity: 0.9;
    animation: textFade var(--loader-duration-medium) infinite ease-in-out;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    z-index: 3;
    position: relative;
}

@keyframes textFade {
    0%, 100% {
        opacity: 0.7;
    }
    50% {
        opacity: 1;
    }
}

/* ===== BARRA DE PROGRESO ===== */
.preloader-progress {
    width: 280px;
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    margin-top: 2rem;
    overflow: hidden;
    position: relative;
    z-index: 3;
    box-shadow: var(--loader-shadow-soft);
}

.preloader-progress::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        var(--loader-white),
        transparent
    );
    animation: progressAnimation var(--loader-duration-medium) infinite;
}

@keyframes progressAnimation {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

/* ===== EFECTOS DE PARTÍCULAS ===== */
.preloader-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 1;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: particleFloat 6s infinite linear;
}

.particle:nth-child(1) { left: 10%; animation-delay: 0s; animation-duration: 6s; }
.particle:nth-child(2) { left: 20%; animation-delay: 1s; animation-duration: 8s; }
.particle:nth-child(3) { left: 30%; animation-delay: 2s; animation-duration: 7s; }
.particle:nth-child(4) { left: 40%; animation-delay: 0.5s; animation-duration: 9s; }
.particle:nth-child(5) { left: 50%; animation-delay: 1.5s; animation-duration: 6s; }
.particle:nth-child(6) { left: 60%; animation-delay: 3s; animation-duration: 8s; }
.particle:nth-child(7) { left: 70%; animation-delay: 2.5s; animation-duration: 7s; }
.particle:nth-child(8) { left: 80%; animation-delay: 4s; animation-duration: 9s; }
.particle:nth-child(9) { left: 90%; animation-delay: 3.5s; animation-duration: 6s; }

@keyframes particleFloat {
    0% {
        top: 100%;
        opacity: 0;
        transform: translateX(0) rotate(0deg);
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        top: -10px;
        opacity: 0;
        transform: translateX(20px) rotate(360deg);
    }
}

/* ===== ESTADOS DEL PRELOADER ===== */
.page-loading {
    overflow: hidden !important;
    cursor: wait;
}

.page-loading * {
    cursor: wait !important;
}

/* Ocultar elementos mientras carga */
.page-loading .navbar-nav,
.page-loading .main-content,
.page-loading .footer {
    visibility: hidden;
    opacity: 0;
}

/* Mostrar elementos cuando termina de cargar */
body:not(.page-loading) .navbar-nav,
body:not(.page-loading) .main-content,
body:not(.page-loading) .footer {
    visibility: visible;
    opacity: 1;
    transition: opacity 0.5s ease-in-out;
}

/* ===== ANIMACIONES DE SALIDA ===== */
#preloader.fade-out {
    opacity: 0;
    transform: scale(1.1);
    pointer-events: none;
}

#preloader.slide-up {
    transform: translateY(-100%);
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

#preloader.zoom-out {
    opacity: 0;
    transform: scale(0.8);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== LOADER PARA CONTENIDO ESPECÍFICO ===== */
.content-loader {
    position: relative;
    min-height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(248, 249, 250, 0.95);
    backdrop-filter: blur(5px);
    border-radius: 12px;
}

.content-loader::before {
    content: '';
    width: 40px;
    height: 40px;
    border: 3px solid rgba(0, 102, 179, 0.2);
    border-top-color: var(--loader-primary);
    border-radius: 50%;
    animation: contentSpinner var(--loader-duration-fast) linear infinite;
}

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

/* ===== SKELETON LOADERS ===== */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeletonLoading 1.5s infinite;
    border-radius: 4px;
}

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

.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
}

.skeleton-text.large {
    height: 24px;
}

.skeleton-text.small {
    height: 12px;
}

.skeleton-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
}

.skeleton-card {
    height: 200px;
    border-radius: 8px;
}

/* ===== LOADER DE BOTONES ===== */
.btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.btn-loading::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: buttonSpinner 0.8s linear infinite;
}

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

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .spinner {
        width: 80px;
        height: 80px;
    }
    
    .preloader-logo img {
        max-height: 80px;
    }
    
    .preloader-text {
        font-size: 16px;
    }
    
    .preloader-progress {
        width: 240px;
    }
    
    .particle {
        width: 3px;
        height: 3px;
    }
}

@media (max-width: 480px) {
    .spinner {
        width: 60px;
        height: 60px;
        margin-bottom: 1.5rem;
    }
    
    .preloader-logo img {
        max-height: 60px;
    }
    
    .preloader-text {
        font-size: 14px;
        margin-top: 0.5rem;
    }
    
    .preloader-progress {
        width: 200px;
        height: 3px;
    }
}

/* ===== MODO OSCURO ===== */
@media (prefers-color-scheme: dark) {
    .content-loader {
        background: rgba(31, 41, 55, 0.95);
    }
    
    .skeleton {
        background: linear-gradient(90deg, #374151 25%, #4B5563 50%, #374151 75%);
        background-size: 200% 100%;
    }
    
    .content-loader::before {
        border-color: rgba(255, 255, 255, 0.2);
        border-top-color: var(--loader-accent);
    }
}

/* ===== UTILIDADES ===== */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(2px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loading-overlay.dark {
    background: rgba(0, 0, 0, 0.8);
    color: white;
}

/* Indicador de loading inline */
.loading-inline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--loader-primary);
}

.loading-inline::before {
    content: '';
    width: 12px;
    height: 12px;
    border: 2px solid rgba(0, 102, 179, 0.2);
    border-top-color: var(--loader-primary);
    border-radius: 50%;
    animation: contentSpinner 0.8s linear infinite;
}

/* ===== ANIMACIONES PERSONALIZADAS ===== */
@keyframes shimmer {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

.shimmer-effect {
    position: relative;
    overflow: hidden;
    background: #f6f7f8;
}

.shimmer-effect::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.6),
        transparent
    );
    animation: shimmer 1.5s infinite;
}

/* ===== ESTADOS DE ERROR ===== */
.loader-error {
    color: #ef4444;
    text-align: center;
    padding: 2rem;
}

.loader-error::before {
    content: '⚠️';
    font-size: 48px;
    display: block;
    margin-bottom: 1rem;
}

/* ===== ACCESIBILIDAD ===== */
@media (prefers-reduced-motion: reduce) {
    #preloader,
    .spinner,
    .particle,
    .skeleton,
    .content-loader::before,
    .btn-loading::before {
        animation: none !important;
    }
    
    .preloader-logo img {
        animation: none !important;
        transform: none !important;
    }
    
    .spinner::before,
    .spinner::after {
        animation: none !important;
    }
}

/* Focus para accesibilidad */
.skip-loader {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--loader-primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 100000;
    transition: top 0.3s;
}

.skip-loader:focus {
    top: 6px;
}