/* ==========================================================================
   ADMIN PANEL STYLESHEET
   ========================================================================== */

/* === 1. Configuración Global e Importación de Fuentes === */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap');

:root {
    --color-primario: #0d1b2a;       /* Azul noche (para fondos y botones principales) */
    --color-secundario: #415a77;    /* Azul acero (para acentos y botones secundarios) */
    --color-acento: #e0e1dd;         /* Blanco hueso (para bordes y fondos sutiles) */
    --color-texto-principal: #1b263b; /* Color de texto principal */
    --color-texto-secundario: #778da9; /* Color de texto más claro */
    --color-blanco: #ffffff;
    --color-error: #e63946;
    --color-exito: #2a9d8f;
    --sombra-tarjeta: 0 4px 20px rgba(0, 0, 0, 0.08);
    --bordes-redondeados: 12px;
    --transicion-suave: all 0.3s ease-in-out;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: #f7f9fb; /* Fondo ligeramente más texturizado */
    color: var(--color-texto-principal);
    line-height: 1.6;
}

/* === 2. Contenedores Principales (Login y Panel) === */
.admin-panel,
.login-container {
    max-width: 1100px;
    margin: 3rem auto;
    padding: 1rem;
}

.login-container {
    max-width: 420px;
}

/* === 3. Componente de Encabezado (Header) === */
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
    background: var(--color-blanco);
    border-radius: var(--bordes-redondeados);
    box-shadow: var(--sombra-tarjeta);
    margin-bottom: 2rem;
}

.panel-header h1 {
    margin: 0;
    font-size: 1.75rem;
    color: var(--color-primario);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.user-info span {
    font-size: 0.9rem;
    color: var(--color-texto-secundario);
}

/* === 4. Componente de Navegación (Dashboard) === */
.panel-nav {
    display: flex;
    gap: 1rem;
    background: var(--color-blanco);
    padding: 1rem 2rem;
    border-radius: var(--bordes-redondeados);
    box-shadow: var(--sombra-tarjeta);
    margin-bottom: 2rem;
}

/* === 5. Tarjetas de Contenido y Formularios === */
main, .panel-content, .content-card, .form-container {
    background: var(--color-blanco);
    padding: 2.5rem;
    border-radius: var(--bordes-redondeados);
    box-shadow: var(--sombra-tarjeta);
    margin-bottom: 2rem;
}

.form-container h2, .content-card h2 {
    margin-top: 0;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--color-acento);
    padding-bottom: 1rem;
}

/* === 6. Estilos Detallados para Formularios === */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--color-texto-principal);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="file"],
select,
textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--color-acento);
    border-radius: 8px;
    font-size: 1rem;
    font-family: 'Roboto', sans-serif;
    color: var(--color-texto-principal);
    transition: var(--transicion-suave);
}
textarea{ resize: vertical; min-height: 120px; }

input[type="file"] {
    padding: 8px;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--color-secundario);
    box-shadow: 0 0 0 3px rgba(65, 90, 119, 0.2);
}

/* === 7. Sistema de Botones Unificado === */
button, .btn, .btn-nav, .btn-back, .btn-logout, .btn-eliminar, .btn-edit, .btn-delete-selected {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 50px; /* Botones redondeados */
    font-family: 'Roboto', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: var(--transicion-suave);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

button:hover, .btn:hover, .btn-nav:hover, .btn-back:hover, .btn-logout:hover, .btn-eliminar:hover, .btn-edit:hover, .btn-delete-selected:hover {
    transform: translateY(-3px);
    box-shadow: 0 7px 14px rgba(0,0,0,0.1);
}

button[type="submit"] { /* Botón principal (Submit) */
    background-color: var(--color-primario);
    color: var(--color-blanco);
    width: 100%;
}
button[type="submit"]:hover { background-color: var(--color-secundario); }

.btn-nav, .nav-button {
    background-color: transparent;
    color: var(--color-secundario);
    border: 1px solid var(--color-secundario);
    padding: 8px 18px;
}
.btn-nav:hover, .nav-button:hover { background-color: var(--color-secundario); color: var(--color-blanco); }

.btn-back { background-color: var(--color-texto-secundario); color: var(--color-blanco); padding: 8px 18px;}
.btn-back:hover { background-color: var(--color-primario); }

.btn-logout, .btn-eliminar { background-color: var(--color-error); color: var(--color-blanco); padding: 8px 18px; }
.btn-logout:hover, .btn-eliminar:hover { background-color: #c92a37; }
.btn-eliminar { font-size: 0.8rem; padding: 6px 12px; }

/* === 8. Tablas de Datos === */
.tabla-usuarios {
    width: 100%;
    border-collapse: collapse;
}
.tabla-usuarios th, .tabla-usuarios td {
    padding: 1rem;
    border-bottom: 1px solid var(--color-acento);
    text-align: left;
    vertical-align: middle;
}
.tabla-usuarios th {
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.8rem;
    color: var(--color-texto-secundario);
}
.tabla-usuarios tr:last-child td { border-bottom: none; }
.tabla-usuarios tr:hover { background-color: #f7f9fb; }

/* === 9. Mensajes de Feedback === */
.message, .error-message {
    padding: 1rem;
    border-radius: var(--bordes-redondeados);
    margin-bottom: 1.5rem;
    border: 1px solid transparent;
    font-weight: 500;
}
.message.error, .error-message {
    background-color: #fcede8;
    color: var(--color-error);
    border-color: var(--color-error);
}
.message.success {
    background-color: #e9f7f5;
    color: var(--color-exito);
    border-color: var(--color-exito);
}

/* === 10. Estilos de Carga de Archivos y Productos === */
/* ... (Tu código original sin cambios) ... */
.inputfile-hidden { width: 0.1px; height: 0.1px; opacity: 0; overflow: hidden; position: absolute; z-index: -1; }
.btn-file-upload { display: inline-block; padding: 10px 15px; cursor: pointer; background-color: var(--color-secundario); color: var(--color-blanco); border-radius: 8px; font-weight: 500; transition: var(--transicion-suave); display: flex; align-items: center; gap: 10px; }
.btn-file-upload:hover { background-color: var(--color-primario); }
.btn-file-upload svg { fill: currentColor; }
.file-name-display { display: inline-block; margin-left: 15px; font-style: italic; color: var(--color-texto-secundario); }
.product-admin-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 2rem; margin-top: 2rem; }
.product-admin-card { background: var(--color-blanco); border-radius: var(--bordes-redondeados); box-shadow: var(--sombra-tarjeta); display: flex; flex-direction: column; overflow: hidden; transition: var(--transicion-suave); position: relative; }
.product-admin-card:hover { transform: translateY(-5px); }
.product-admin-image { width: 100%; height: 180px; object-fit: cover; border-bottom: 1px solid var(--color-acento); }
.product-admin-info { padding: 1rem; flex-grow: 1; }
.product-admin-name { margin: 0 0 0.5rem 0; font-size: 1.1rem; font-weight: 700; color: var(--color-primario); }
.product-admin-price { margin: 0; font-size: 1rem; color: var(--color-texto-secundario); }
.product-admin-sku { font-size: 0.8rem; color: var(--color-texto-secundario); margin-top: auto; padding-top: 1rem; }
.product-admin-actions { display: flex; padding: 0 1rem 1rem 1rem; gap: 0.5rem; }
.btn-edit, .btn-delete { flex-grow: 1; text-align: center; padding: 8px 15px; color: var(--color-blanco); text-decoration: none; border-radius: 8px; font-weight: 500; transition: var(--transicion-suave); }
.btn-edit { background-color: var(--color-secundario); }
.btn-edit:hover { background-color: #2980b9; }
.btn-delete { background-color: var(--color-error); }
.btn-delete:hover { background-color: #c0392b; }
.btn-delete-selected { background-color: #c0392b; color: white; border: none; padding: 10px 20px; border-radius: 5px; cursor: pointer; font-size: 1rem; font-weight: 500; margin-bottom: 20px; transition: background-color 0.3s; }
.btn-delete-selected:hover { background-color: #e74c3c; }
.product-checkbox { position: absolute; top: 10px; left: 10px; transform: scale(1.5); cursor: pointer; }


/* ================================================================
   INICIO DE LA ADICIÓN: SECCIÓN ADAPTABLE (RESPONSIVE) Y MODO OSCURO
   ================================================================ */

/* --- 1. Reglas para Adaptable --- */
@media (max-width: 768px) {
    body { font-size: 15px; }
    .admin-panel, .login-container { margin: 1rem; padding: 0; width: auto; }
    .panel-header { flex-direction: column; gap: 1.5rem; text-align: center; padding: 1.5rem; }
    .panel-header h1 { font-size: 1.5rem; }
    .user-info { flex-direction: column; width: 100%; gap: 0.5rem; }
    .panel-nav { flex-direction: column; flex-wrap: wrap; padding: 1.5rem; }
    .nav-button { width: 100%; text-align: center; }
    .form-container, .content-card { padding: 1.5rem; }
    .product-admin-list { grid-template-columns: 1fr; }
}

/* --- 2. ADICIÓN: Modo Oscuro Automático --- */
@media (prefers-color-scheme: dark) {
    :root {
        --color-primario-dark: #e0e1dd;         
        --color-secundario-dark: #778da9;       
        --color-acento-dark: #415a77;           
        --color-texto-principal-dark: #f7f9fb;  
        --color-blanco-dark: #0d1b2a;           
        --sombra-tarjeta-dark: 0 4px 20px rgba(0, 0, 0, 0.25);
        --color-fondo-dark: #1b263b;
    }

    body {
        background-color: var(--color-fondo-dark);
        color: var(--color-texto-principal-dark);
    }

    .panel-header, .panel-nav, .content-card, .form-container, main, .panel-content {
        background: var(--color-blanco-dark);
        border: 1px solid var(--color-acento-dark);
    }
    
    .panel-header h1, .form-container h2, .content-card h2, .form-group label, .product-admin-name {
        color: var(--color-primario-dark);
    }

    .form-container h2, .content-card h2 {
        border-bottom-color: var(--color-acento-dark);
    }

    input[type="text"], input[type="email"], input[type="password"], input[type="number"], input[type="file"], textarea, select {
        background-color: var(--color-secundario-dark);
        color: var(--color-texto-principal-dark);
        border-color: var(--color-acento-dark);
    }

    .tabla-usuarios { border: 1px solid var(--color-acento-dark); }
    .tabla-usuarios th, .tabla-usuarios td { border-bottom-color: var(--color-acento-dark); }
    .tabla-usuarios tr:hover td { background-color: #152130; } /* Un color de hover oscuro */

    button[type="submit"] { background-color: var(--color-secundario-dark); color: #fff; }
    button[type="submit"]:hover { background-color: var(--color-primario-dark); color: #000; }
    .nav-button { color: var(--color-primario-dark); border-color: var(--color-primario-dark); }
    .nav-button:hover { background-color: var(--color-primario-dark); color: #000; }
}