/**
 * Hoja de estilos para la página de inicio de sesión.
 *
 * Utiliza técnicas modernas como "glassmorphism", gradientes, variables CSS y
 * animaciones para crear una experiencia de usuario atractiva y fluida.
 */

/* --- Paleta de Colores y Variables Globales --- */
:root {
    /* Gradientes para fondos y elementos destacados */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    /* Variables para el efecto "glassmorphism" */
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.18);
    --shadow-light: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    /* Colores de texto */
    --text-primary: #2d3748;
    --text-secondary: #4a5568;
    --text-light: rgba(255, 255, 255, 0.9);
}

* {
    box-sizing: border-box;
}

/* --- Estilos Base del Body (solo cuando está en login) --- */
body.login-page {
    margin: 0 !important;
    min-height: 100vh !important;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    position: relative;
    padding: 2rem 1rem !important;
    overflow-y: auto !important;
}

/* Efecto de fondo animado con pseudo-elementos */
body.login-page::before {
    content: '' !important;
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    z-index: 1 !important;
    /* Múltiples gradientes radiales para crear un efecto de "burbujas" o "luces" más visibles */
    background:
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 60% 40%, rgba(255, 255, 255, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 10% 90%, rgba(255, 255, 255, 0.1) 0%, transparent 45%) !important;
    animation: float 20s ease-in-out infinite !important;
    pointer-events: none !important;
}

/* Animación que mueve y rota sutilmente el fondo */
@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33% { transform: translateY(-30px) rotate(120deg); }
    66% { transform: translateY(20px) rotate(240deg); }
}

/* Glassmorphism container */
.login-container { /* Contenedor principal que centra la tarjeta */
    position: relative;
    width: 100%;
    max-width: 380px;
    z-index: 2;
    margin: auto;
}

.glass-card {
    /* Estilos clave para el efecto de "cristal esmerilado" con colores más vibrantes */
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.8) 0%, rgba(118, 75, 162, 0.85) 100%);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.5),
                0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    padding: 1.75rem 2rem;
    position: relative;
    overflow: hidden;
}

/* Línea brillante que se anima en la parte superior de la tarjeta */
.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -50%;
    width: 200%;
    height: 2px;
    background: var(--success-gradient);
    animation: shimmer 3s ease-in-out infinite;
}

/* Animación de la línea brillante */
@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* --- Sección de Logo y Título --- */
.logo-section {
    text-align: center;
    margin-bottom: 1rem;
}

.logo-container {
    position: relative;
    display: inline-block;
    margin-bottom: 1rem;
}

.logo-img {
    max-width: 100px;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    animation: pulse 2s ease-in-out infinite alternate;
    background: white;
    padding: 0.75rem;
}

.logo-fallback {
    width: 120px;
    height: 120px;
    background: var(--success-gradient); /* Fondo de gradiente si la imagen falla */
    border-radius: 50%;
    display: none; /* Hide by default, shown by JS if logo fails */
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    animation: pulse 2s ease-in-out infinite alternate;
}

/* Animación de pulso sutil para el logo */
@keyframes pulse {
    from { transform: scale(1); }
    to { transform: scale(1.05); }
}

.logo-icon {
    font-size: 3rem;
    color: white;
}

.title-main {
    color: white;
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
}

.title-sub {
    color: rgba(255, 255, 255, 0.95);
    font-size: 0.9rem;
    font-weight: 400;
    margin-top: 0.5rem;
}

/* --- Estilos del Formulario --- */
.modern-form {
    position: relative;
}

.form-group {
    position: relative;
    margin-bottom: 0.85rem;
}

.form-input {
    width: 100%;
    /* El padding izquierdo deja espacio para el icono */
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1rem;
    transition: all 0.3s ease;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.form-input:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.5);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2);
}

.form-input::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

/* Icono dentro del campo de entrada */
.form-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.2rem;
    z-index: 1;
}

/* --- Estilos del CAPTCHA --- */
.captcha-section {
    margin-bottom: 0.85rem;
}

.captcha-label {
    color: white;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
    display: block;
}

.captcha-image-container {
    background: rgba(255, 255, 255, 0.15);
    padding: 0.5rem;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid rgba(255, 255, 255, 0.3);
    margin-bottom: 0.85rem;
    text-align: center;
    line-height: 0; /* Para quitar espacio extra debajo de la imagen */
}

.captcha-image-container:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
}

.captcha-image {
    border-radius: 5px;
    vertical-align: middle;
}

/* --- Estilos del Botón de Login --- */
.login-btn {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 15px;
    background: var(--success-gradient);
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
}

/* Efecto de brillo que se desliza al pasar el cursor */
.login-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

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

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.login-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* --- Spinner de Carga para el Botón --- */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
    margin-right: 0.5rem;
}

.spinning { 
    animation: spin 1s linear infinite; 
}

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

/* --- Alerta de Error --- */
.modern-alert {
    background: rgba(220, 53, 69, 0.95);
    color: white;
    padding: 0.85rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 4px 15px rgba(220, 53, 69, 0.4);
    opacity: 0;
    transform: translateY(-20px);
    transition: all 0.3s ease;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.modern-alert.show {
    opacity: 1;
    transform: translateY(0);
}

/* --- Estilos del Footer --- */
.modern-footer {
    text-align: center;
    margin-top: 1rem;
    color: var(--text-light);
    font-size: 0.85rem;
    padding: 0 1rem;
}

.footer-line {
    margin-bottom: 0.5rem;
}

.footer-contact {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin: 1rem 0;
}

.whatsapp-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    background: rgba(37, 211, 102, 0.2);
    border: 1px solid rgba(37, 211, 102, 0.3);
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.whatsapp-btn:hover {
    background: rgba(37, 211, 102, 0.3);
    color: white;
    transform: translateY(-2px);
}

.license-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.license-link:hover {
    color: white;
}

/* --- Diseño Responsivo --- */
@media (max-width: 480px) {
    .login-container {
        padding: 1rem;
    }
    
    .glass-card {
        padding: 2rem 1.5rem;
    }

    .logo-img, .logo-fallback {
        width: 100px;
        height: 100px;
    }

    .logo-icon {
        font-size: 2.5rem;
    }

    .title-main {
        font-size: 1.5rem;
    }
}

/* Ajuste para pantallas de baja altura para que el contenido no se corte */
@media (max-height: 850px) { /* Punto de quiebre para cuando el contenido ya no cabe */
    body.login-page {
        align-items: flex-start; /* Alinear arriba */
        overflow-y: auto; /* Permitir scroll */
    }
}

/* --- Clases de Utilidad (movidas desde index.php) --- */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 1;
    transition: opacity 0.5s ease;
}
.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.fade-in {
    opacity: 0;
    animation: fadeIn 1s ease-in forwards;
}
@keyframes fadeIn {
    to { opacity: 1; }
}

.shake { animation: shake 0.5s ease-in-out; }
@keyframes shake {
    /* Animación de "sacudida" para la tarjeta en caso de error de login */
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}