/* Fuentes - Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;700;900&display=swap');

/* === VARIABLES CSS PARA TEMAS === */
:root { 
    /* MODO OSCURO (POR DEFECTO) */
    --main-bg: #0c0a09;
    --main-text: #e7e5e4;
    --muted-text: #a8a29e; /* text-stone-400 o similar */
    --light-text-on-dark: #e7e5e4; /* Texto blanco/claro sobre fondos oscuros */
    --dark-text-on-light: #1f2937; /* Texto oscuro sobre fondos claros (para light mode) */

    --card-bg: rgba(20, 18, 17, 0.75); /* glassmorphism principal */
    --card-border: rgba(255, 255, 255, 0.1);
    --card-light-bg: rgba(30, 28, 27, 0.6); /* glassmorphism-light (ej: index landing) */
    
    --input-bg: rgba(255, 255, 255, 0.05);
    --input-border: rgba(255,255,255,0.1);
    --input-text: #e7e5e4;
    --input-placeholder: #78716c; /* stone-500 */
    
    --focus-ring-admin: #8b5cf6; /* Púrpura (predeterminado para admin) */
    --focus-shadow-admin: rgba(139, 92, 246, 0.3);
    --focus-ring-client: #84cc16; /* Lima (predeterminado para cliente) */
    --focus-shadow-client: rgba(132, 204, 22, 0.3);
    --focus-ring-general: #f59e0b; /* Ámbar (predeterminado para público general) */
    --focus-shadow-general: rgba(245, 158, 11, 0.3);

    --aurora-1-color: #3b82f6; /* Azul */
    --aurora-2-color: #10b981; /* Verde */
    --aurora-opacity: 0.15;

    /* Colores de Acento */
    --accent-blue: #3b82f6;
    --accent-green: #10b981;
    --accent-purple: #8b5cf6;
    --accent-amber: #f59e0b;
    --accent-lime: #84cc16;
    --accent-red: #ef4444;
    --accent-yellow: #eab308;
    --accent-orange: #f97316;
    --accent-teal: #14b8a6;
    --accent-rose: #f43f5e;
}

html.light-mode { 
    /* MODO CLARO */
    --main-bg: #f3f4f6;    /* Gris claro */
    --main-text: #1f2937;   /* Gris oscuro */
    --muted-text: #4b5563;  /* text-gray-600 */
    
    --card-bg: rgba(255, 255, 255, 0.75); /* Blanco semitransparente */
    --card-border: rgba(0, 0, 0, 0.08);
    --card-light-bg: rgba(249, 250, 251, 0.6); /* Blanco más sólido para landing */

    --input-bg: rgba(0, 0, 0, 0.03);
    --input-border: rgba(0,0,0,0.1);
    --input-text: #1f2937;
    --input-placeholder: #9ca3af; /* gray-400 */

    --focus-ring-admin: #7c3aed;
    --focus-shadow-admin: rgba(124, 58, 237, 0.3);
    --focus-ring-client: #65a30d;
    --focus-shadow-client: rgba(101, 163, 13, 0.3);
    --focus-ring-general: #d97706;
    --focus-shadow-general: rgba(217, 119, 6, 0.3);
    
    --aurora-1-color: #a78bfa; /* Lila pastel */
    --aurora-2-color: #6ee7b7; /* Verde menta pastel */
    --aurora-opacity: 0.2;

    --accent-blue: #2563eb;
    --accent-green: #059669;
    --accent-purple: #7c3aed;
    --accent-amber: #d97706;
    --accent-lime: #65a30d;
    --accent-red: #dc2626;
    --accent-yellow: #ca8a04;
    --accent-orange: #ea580c;
    --accent-teal: #0d9488;
    --accent-rose: #e11d48;
}

/* === ESTILOS BASE NEXUS === */
body { 
    font-family: 'Montserrat', sans-serif; 
    background-color: var(--main-bg); 
    color: var(--main-text); 
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.aurora-container { 
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; 
    z-index: -1; overflow: hidden; 
}
.aurora-container::before, .aurora-container::after { 
    content: ''; position: absolute; top: 50%; left: 50%; 
    width: 150vw; height: 150vw; border-radius: 50%; 
    opacity: var(--aurora-opacity); filter: blur(100px); 
    animation: pulse 25s infinite alternate; 
    transition: background 0.5s ease;
}
.aurora-container::before { 
    background: radial-gradient(circle, var(--aurora-1-color), transparent 50%); 
    transform-origin: 30% 70%; 
}
.aurora-container::after { 
    background: radial-gradient(circle, var(--aurora-2-color), transparent 50%); 
    transform-origin: 70% 30%; animation-delay: -12.5s; 
}

@keyframes pulse { 
    0%, 100% { transform: translate(-50%, -50%) scale(0.85); } 
    50% { transform: translate(-50%, -50%) scale(1.15); } 
}

.glassmorphism { 
    background: var(--card-bg); 
    backdrop-filter: blur(15px); -webkit-backdrop-filter: blur(15px); 
    border: 1px solid var(--card-border); 
    transition: background 0.3s ease, border 0.3s ease;
}
.glassmorphism-light { /* Para la tarjeta del index.php (landing) y otras que necesiten diferenciarse */
    background: var(--card-light-bg); 
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); 
    border: 1px solid var(--card-border);
    transition: background 0.3s ease, border 0.3s ease;
}

@keyframes fadeIn { 
    from { opacity: 0; transform: translateY(10px) scale(0.98); } 
    to { opacity: 1; transform: translateY(0) scale(1); } 
}
.fade-in-item { 
    opacity: 0; animation: fadeIn 0.5s ease-out forwards; 
}

/* === ESTILOS DE FORMULARIO NEXUS === */
.label-nexus {
    display: block;
    font-size: 0.875rem; /* text-sm */
    font-weight: 500; /* font-medium */
    color: var(--muted-text);
    margin-bottom: 0.25rem; /* mb-1 */
}
.input-nexus {
    display: block;
    width: 100%;
    border-radius: 0.375rem; /* rounded-md */
    background-color: var(--input-bg);
    color: var(--main-text);
    padding: 0.625rem 0.75rem; /* py-2.5 px-3 */
    border: 1px solid var(--input-border);
    transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out, background-color 0.3s ease, color 0.3s ease;
}
.input-nexus:focus {
    outline: none;
    border-color: var(--focus-ring-general); /* Color de foco general, puedes crear variantes */
    box-shadow: 0 0 0 2px var(--focus-shadow-general); 
}
/* Para selects personalizados si los estilizas con appearance-none */
.input-nexus.appearance-none { 
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='var(--muted-text)' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.5rem center;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}
html.light-mode .input-nexus.appearance-none { /* Flecha más oscura para modo claro */
     background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%234b5563' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
}


/* Estilo para el input de archivo personalizado */
.custom-file-upload-label { 
    border: 1px solid var(--input-border); 
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 0.75rem;
    cursor: pointer; 
    border-radius: 0.375rem; 
    background-color: var(--input-bg); 
    transition: background-color 0.2s, border-color 0.2s; 
    width: 100%;
    color: var(--muted-text); /* Para el texto "Seleccionar archivo..." */
}
.custom-file-upload-label:hover { 
    background-color: rgba(255,255,255,0.1); /* Ajustar para modo claro */
    border-color: var(--focus-ring-client); /* Usamos el verde cliente como ejemplo */
}
html.light-mode .custom-file-upload-label:hover {
     background-color: rgba(0,0,0,0.05);
}
.custom-file-upload-label svg {
    color: var(--muted-text);
}


/* === ESTILOS DE TABLA NEXUS === */
.table-nexus { 
    width: 100%; 
    margin-top: 1rem; 
    border-collapse: collapse; 
}
.table-nexus th, .table-nexus td { 
    padding: 0.75rem 1rem; 
    text-align: left; 
    border-bottom: 1px solid var(--card-border); 
}
.table-nexus th { 
    background-color: rgba(255,255,255,0.05); /* Un poco más claro en modo oscuro */
    font-weight: 600; 
    text-transform: uppercase; 
    font-size: 0.75rem; 
    letter-spacing: 0.05em;
    color: var(--main-text);
}
html.light-mode .table-nexus th {
    background-color: rgba(0,0,0,0.03); /* Un poco más oscuro en modo claro */
}
.table-nexus tbody tr:hover { 
    background-color: rgba(255,255,255,0.03); 
}
html.light-mode .table-nexus tbody tr:hover { 
    background-color: rgba(0,0,0,0.02); 
}

/* === BOTÓN NEXUS (para el toggle de tema y otros botones genéricos) === */
.btn-nexus {
    transition: all 0.3s ease;
    transform-style: preserve-3d;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem; /* rounded-lg */
    font-weight: 600; /* font-bold */
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.btn-nexus:hover {
    transform: translateY(-2px) scale(1.03);
    box-shadow: 0 8px 15px rgba(0,0,0,0.2);
}
/* Ejemplo de botón primario (puedes crear más variantes) */
.btn-primary {
    background-color: var(--accent-purple);
    color: var(--light-text-on-dark);
}
html.light-mode .btn-primary {
    color: var(--light-text-on-dark); /* Puede que necesites un color específico para texto en botón claro */
}

/* --- ESTILOS ADICIONALES PARA LANDING PAGE (index.php) --- */

/* Estilo para el Navbar tipo Glassmorphism */
.navbar-glass {
    background: color-mix(in srgb, var(--card-bg) 70%, transparent);
    backdrop-filter: blur(12px); 
    -webkit-backdrop-filter: blur(12px); 
    border-bottom: 1px solid var(--card-border); 
}
/* Clase para el navbar cuando está en el top (transparente) */
.navbar-top {
    background-color: transparent;
    border-bottom-color: transparent;
    box-shadow: none;
}

/* Enlaces del Navbar */
.nav-link { 
    transition: color 0.3s ease; 
    color: var(--muted-text); 
}
.nav-link:hover { 
    color: var(--main-text); 
}

/* Botones específicos del Navbar */
.nav-btn { 
    padding: 0.5rem 1rem; 
    font-size: 0.875rem; 
}

/* Título principal con efecto de gradiente */
.hero-title {
    background: linear-gradient(120deg, var(--heading-text) 60%, var(--muted-text));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 2px 5px rgba(0,0,0,0.5));
}
html.light-mode .hero-title, html.theme-laboratorio .hero-title {
    filter: none;
}

/* Botones de Llamada a la Acción Principales */
.btn-principal { 
    background-color: var(--accent-blue); 
    color: white; 
    transition: all 0.3s ease; 
    box-shadow: 0 4px 15px -5px var(--accent-blue);
    font-weight: 600;
    border-radius: 9999px; /* full-rounded */
    padding: 0.75rem 2rem; /* py-3 px-8 */
    font-size: 1rem;
}
.btn-principal:hover { 
    transform: translateY(-3px) scale(1.05); 
    box-shadow: 0 8px 25px -8px var(--accent-blue); 
}
.btn-secundario { 
    background-color: var(--card-bg); 
    color: var(--main-text); 
    border: 1px solid var(--card-border); 
    transition: all 0.3s ease;
    font-weight: 600;
    border-radius: 9999px;
    padding: 0.75rem 2rem;
    font-size: 1rem;
}
.btn-secundario:hover { 
    transform: translateY(-3px); 
    border-color: var(--main-text); 
    background-color: var(--card-light-bg);
}

/* Tarjetas "Cómo Funciona" */
.step-card { 
    background-color: var(--card-bg); 
    border: 1px solid var(--card-border); 
    transition: all 0.3s ease; 
    border-radius: 1rem; 
    padding: 1.5rem; 
}
.step-card:hover { 
    transform: translateY(-5px); 
    box-shadow: 0 10px 20px rgba(0,0,0,0.1); 
}
.step-icon { 
    color: var(--accent-purple); 
}

/* Contenedor de Video Responsive */
.video-container {
    position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;
    width: 100%; max-width: 896px; 
    border-radius: 1rem; 
    box-shadow: 0 15px 35px rgba(0,0,0,0.2); 
    border: 1px solid var(--card-border); 
    background-color: #000; 
}
.video-container iframe {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none;
}

/* Animaciones de Scroll */
.scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.scroll-reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}