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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--fondo-principal);
    color: var(--texto-principal);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    transition: background var(--transicion-normal), color var(--transicion-normal);
}

.contenedor-login {
    width: 100%;
    max-width: 420px;
}

.tarjeta-login {
    background: var(--fondo-secundario);
    border-radius: var(--borde-radio-lg);
    box-shadow: var(--sombra-lg);
    padding: 40px;
    border: 1px solid var(--borde-color);
}

.login-encabezado {
    text-align: center;
    margin-bottom: 32px;
}

.logo-login {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: var(--color-primario);
    color: var(--texto-inverso);
    border-radius: 50%;
    margin-bottom: 16px;
}

.login-encabezado h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-primario);
    margin-bottom: 8px;
}

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

.alerta {
    padding: 12px 16px;
    border-radius: var(--borde-radio-sm);
    margin-bottom: 20px;
    font-size: 14px;
}

.alerta-exito {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-exito);
    border: 1px solid var(--color-exito);
}

.alerta-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-peligro);
    border: 1px solid var(--color-peligro);
}

.campo-formulario {
    margin-bottom: 20px;
}

.campo-formulario label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--texto-principal);
    margin-bottom: 8px;
}

.campo-formulario input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--borde-color);
    border-radius: var(--borde-radio);
    background: var(--fondo-principal);
    color: var(--texto-principal);
    font-size: 15px;
    transition: border-color var(--transicion-rapida);
}

.campo-formulario input:focus {
    outline: none;
    border-color: var(--color-primario);
}

.btn-login {
    width: 100%;
    padding: 14px;
    background: var(--color-primario);
    color: var(--texto-inverso);
    border: none;
    border-radius: var(--borde-radio);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transicion-rapida);
}

.btn-login:hover {
    background: var(--color-primario-hover);
}

.login-pie {
    margin-top: 24px;
    text-align: center;
    font-size: 13px;
}

.login-pie a {
    color: var(--color-primario);
    text-decoration: none;
}

.login-pie a:hover {
    text-decoration: underline;
}

.version {
    margin-top: 12px;
    color: var(--texto-terciario);
    font-size: 12px;
}