/* Variables CSS */
:root {
    --color-primario: #4285f4;
    --color-secundario: #34a853;
    --color-advertencia: #ea4335;
    --color-fondo: #ffffff;
    --color-fondo-claro: #f8f9fa;
    --color-texto: #333333;
    --color-texto-claro: #666666;
    --color-borde: #dee2e6;
    --espaciado-base: 20px;
    --border-radius: 4px;
}

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

/* Estilos generales */
body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-texto);
    background-color: var(--color-fondo-claro);
}

/* ========================================
   PANTALLA DE LOGIN
   ======================================== */
.pantalla-login {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.login-contenedor {
    background-color: var(--color-fondo);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    width: 90%;
    max-width: 400px;
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 22px;
    color: var(--color-primario);
    margin-bottom: 8px;
}

.login-header p {
    font-size: 14px;
    color: var(--color-texto-claro);
}

.login-formulario {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.campo-login {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.campo-login label {
    font-weight: 500;
    color: var(--color-texto);
    font-size: 14px;
}

.campo-login input {
    padding: 12px;
    border: 1px solid var(--color-borde);
    border-radius: var(--border-radius);
    font-size: 14px;
    transition: border-color 0.3s;
}

.campo-login input:focus {
    outline: none;
    border-color: var(--color-primario);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.1);
}

.mensaje-error-login {
    color: var(--color-advertencia);
    font-size: 13px;
    text-align: center;
    min-height: 20px;
}

.boton-login {
    padding: 12px 24px;
    background-color: var(--color-primario);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.boton-login:hover {
    background-color: #3367d6;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.boton-login:active {
    transform: translateY(0);
}

/* ========================================
   BARRA DE SESIÓN
   ======================================== */
.barra-sesion {
    background-color: var(--color-fondo);
    border-bottom: 1px solid var(--color-borde);
    padding: 12px var(--espaciado-base);
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 15px;
}

.info-sesion {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-texto);
    font-size: 14px;
}

.icono-usuario {
    font-size: 20px;
}

.boton-cerrar-sesion {
    padding: 8px 16px;
    background-color: var(--color-advertencia);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.boton-cerrar-sesion:hover {
    background-color: #d33b2c;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

/* ========================================
   APLICACIÓN PRINCIPAL
   ======================================== */
.app-principal {
    display: block;
}

/* Header */
header {
    background-color: var(--color-primario);
    color: white;
    padding: var(--espaciado-base);
    text-align: center;
}

header h1 {
    font-size: 24px;
    margin-bottom: 5px;
}

header p {
    font-size: 14px;
    opacity: 0.9;
}

/* Pestañas */
.pestanas {
    display: flex;
    background-color: var(--color-fondo);
    border-bottom: 2px solid var(--color-borde);
    padding: 0 var(--espaciado-base);
}

.pestana {
    padding: 15px 30px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 16px;
    color: var(--color-texto-claro);
    transition: all 0.3s;
}

.pestana:hover {
    color: var(--color-primario);
    background-color: var(--color-fondo-claro);
}

.pestana.activa {
    color: var(--color-primario);
    border-bottom-color: var(--color-primario);
    font-weight: 500;
}

/* Main */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--espaciado-base);
}

/* Contenido de pestañas */
.contenido-pestana {
    display: none;
    background-color: var(--color-fondo);
    padding: var(--espaciado-base);
    border-radius: var(--border-radius);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.contenido-pestana.activa {
    display: block;
}

h2 {
    font-size: 22px;
    margin-bottom: var(--espaciado-base);
    color: var(--color-primario);
}

h3 {
    font-size: 18px;
    margin: var(--espaciado-base) 0 15px 0;
    color: var(--color-texto);
}

/* Formulario */
.formulario {
    margin-bottom: var(--espaciado-base);
}

.fila {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 15px;
}

.campo {
    display: flex;
    flex-direction: column;
}

.campo-completo {
    grid-column: 1 / -1;
}

label {
    font-weight: 500;
    margin-bottom: 5px;
    color: var(--color-texto);
}

.obligatorio {
    color: var(--color-advertencia);
}

input[type="text"],
input[type="email"],
input[type="number"],
input[type="password"] {
    padding: 10px 12px;
    border: 1px solid var(--color-borde);
    border-radius: var(--border-radius);
    font-size: 14px;
    width: 100%;
    transition: border-color 0.3s;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="number"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: var(--color-primario);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.1);
}

input[readonly] {
    background-color: var(--color-fondo-claro);
    cursor: not-allowed;
}

input:disabled {
    background-color: var(--color-fondo-claro);
    cursor: not-allowed;
    opacity: 0.6;
}

.contador-caracteres {
    font-size: 12px;
    color: var(--color-texto-claro);
    text-align: right;
    margin-top: 5px;
}

.mensaje-error {
    color: var(--color-advertencia);
    font-size: 12px;
    margin-top: 5px;
    display: none;
}

.mensaje-error.activo {
    display: block;
}

/* Tabla */
.tabla-contenedor {
    overflow-x: auto;
    margin-bottom: var(--espaciado-base);
}

.tabla {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--color-fondo);
}

.tabla th,
.tabla td {
    padding: 12px;
    text-align: left;
    border: 1px solid var(--color-borde);
}

.tabla th {
    background-color: var(--color-primario);
    color: white;
    font-weight: 500;
}

.tabla tbody tr:nth-child(even) {
    background-color: var(--color-fondo-claro);
}

.tabla tbody tr:hover {
    background-color: #e8f0fe;
}

.tabla td input {
    width: 100%;
    border: 1px solid var(--color-borde);
    padding: 8px;
    border-radius: var(--border-radius);
}

.tabla td input[type="number"] {
    width: 100px;
}

.tabla .columna-item {
    width: 60px;
    text-align: center;
}

.tabla .columna-cantidad {
    width: 120px;
}

.tabla .columna-acciones {
    width: 100px;
    text-align: center;
}

/* Tabla de Usuarios */
.tabla-usuarios th:nth-child(1) {
    width: 150px;
}

.tabla-usuarios th:nth-child(2) {
    width: 300px;
}

/* Botones */
.botones-principales {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: var(--espaciado-base);
}

.boton {
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.boton:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.boton:active {
    transform: translateY(0);
}

.boton:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.boton-primario {
    background-color: var(--color-primario);
    color: white;
}

.boton-primario:hover {
    background-color: #3367d6;
}

.boton-secundario {
    background-color: var(--color-secundario);
    color: white;
}

.boton-secundario:hover {
    background-color: #2d8e47;
}

.boton-advertencia {
    background-color: var(--color-advertencia);
    color: white;
}

.boton-advertencia:hover {
    background-color: #d33b2c;
}

.boton-guardar {
    background-color: var(--color-secundario);
    color: white;
}

.boton-guardar:hover {
    background-color: #2d8e47;
}

.boton-editar {
    background-color: #fbbc04;
    color: white;
}

.boton-editar:hover {
    background-color: #f9ab00;
}

.boton-pdf {
    background-color: #0891b2;
    color: white;
}

.boton-pdf:hover {
    background-color: #0e7490;
}

.boton-imprimir {
    background-color: #9333ea;
    color: white;
}

.boton-imprimir:hover {
    background-color: #7e22ce;
}

.boton-eliminar {
    background-color: var(--color-advertencia);
    color: white;
    padding: 6px 12px;
    font-size: 12px;
}

.boton-eliminar:hover {
    background-color: #d33b2c;
}

/* Tablas de información */
.info-tabla {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--espaciado-base);
}

.tabla-info {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--color-fondo);
    border: 1px solid var(--color-borde);
}

.tabla-info thead th {
    background-color: var(--color-primario);
    color: white;
    padding: 12px;
    text-align: left;
    font-weight: 500;
}

.tabla-info tbody td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--color-borde);
}

.tabla-info tbody tr:last-child td {
    border-bottom: none;
}

.tabla-info .etiqueta {
    font-weight: 500;
    background-color: var(--color-fondo-claro);
    width: 40%;
}

/* Footer */
.footer {
    background-color: var(--color-texto);
    color: white;
    padding: var(--espaciado-base);
    margin-top: 40px;
    text-align: center;
}

.footer-contenido p {
    font-size: 12px;
    margin: 5px 0;
    line-height: 1.8;
}

.footer-contenido strong {
    font-weight: 600;
}

/* ========================================
   RESPONSIVE - TABLET
   ======================================== */
@media (max-width: 1024px) {
    .fila {
        grid-template-columns: 1fr;
    }
    
    .pestanas {
        padding: 0 10px;
    }
    
    .pestana {
        padding: 12px 20px;
        font-size: 14px;
    }
}

/* ========================================
   RESPONSIVE - MOBILE
   ======================================== */
@media (max-width: 768px) {
    body {
        font-size: 13px;
    }
    
    /* Login responsive */
    .login-contenedor {
        padding: 30px 20px;
    }
    
    .login-header h1 {
        font-size: 18px;
    }
    
    /* Barra de sesión responsive */
    .barra-sesion {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }
    
    .info-sesion {
        justify-content: center;
        font-size: 13px;
    }
    
    .boton-cerrar-sesion {
        width: 100%;
    }
    
    header h1 {
        font-size: 20px;
    }
    
    header p {
        font-size: 12px;
    }
    
    main {
        padding: 10px;
    }
    
    .contenido-pestana {
        padding: 15px;
    }
    
    h2 {
        font-size: 18px;
    }
    
    h3 {
        font-size: 16px;
    }
    
    .pestana {
        padding: 10px 15px;
        font-size: 13px;
        flex: 1;
        text-align: center;
    }
    
    .botones-principales {
        flex-direction: column;
    }
    
    .boton {
        width: 100%;
        justify-content: center;
    }
    
    .tabla th,
    .tabla td {
        padding: 8px;
        font-size: 12px;
    }
    
    .tabla td input {
        padding: 6px;
        font-size: 12px;
    }
    
    .tabla-info .etiqueta {
        width: 50%;
    }
    
    .footer-contenido p {
        font-size: 10px;
    }
}

/* ========================================
   ANIMACIONES
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.contenido-pestana.activa {
    animation: fadeIn 0.3s ease-out;
}