:root {
    --color-primario: #0D410D;
    --color-primario-oscuro: #082e08;
    --color-primario-claro: #1a6e1a;
    --color-primario-suave: #e8f5e8;
    --color-blanco: #ffffff;
    --color-texto: #2d3436;
    --color-texto-claro: #636e72;
    --color-sombra: rgba(0, 0, 0, 0.1);
    --radio-borde: 16px;
    --fuente-principal: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

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

body {
    font-family: var(--fuente-principal);
    overflow: hidden;
    height: 100vh;
}

/* contenedor principal */
.contenedor-login {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0a2e0a 0%, #0D410D 30%, #1a6e1a 60%, #2d8a2d 100%);
    overflow: hidden;
}

.fondo-login {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.circulo {
    position: absolute;
    border-radius: 50%;
    opacity: 0.05;
    background: var(--color-blanco);
}

.circulo-1 {
    width: 600px;
    height: 600px;
    top: -200px;
    right: -200px;
    animation: flotar 8s ease-in-out infinite;
}

.circulo-2 {
    width: 400px;
    height: 400px;
    bottom: -100px;
    left: -100px;
    animation: flotar 10s ease-in-out infinite reverse;
}

.circulo-3 {
    width: 300px;
    height: 300px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: flotar 12s ease-in-out infinite 2s;
}

@keyframes flotar {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(20px, -20px) scale(1.05); }
}

/* tarjeta login */
.tarjeta-login {
    display: flex;
    background: var(--color-blanco);
    border-radius: var(--radio-borde);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.3);
    width: 90%;
    max-width: 900px;
    min-height: 520px;
    overflow: hidden;
    z-index: 1;
    animation: aparecer 0.5s ease-out;
}

@keyframes aparecer {
    from { opacity: 0; transform: translateY(20px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* barra lateral institucion */
.lateral-institucion {
    width: 340px;
    min-width: 340px;
    background: linear-gradient(135deg, #0a2e0a, #0D410D 40%, #1a6e1a 70%, #2d8a2d 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 40px;
}

.lateral-institucion::after {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.contenido-lateral {
    text-align: center;
    color: var(--color-blanco);
    z-index: 1;
}

.logo-grande {
    width: 150px;
    height: 150px;
    margin: 0 auto 24px;
    background: rgba(255, 255, 255, 1);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.logo-grande img {
    width: 120px;
    height: 120px;
    object-fit: contain;
}

.nombre-sistema-lateral {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: 1px;
    margin-bottom: 8px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.nombre-institucion-lateral {
    font-size: 0.85rem;
    opacity: 0.85;
    line-height: 1.5;
    max-width: 240px;
    margin: 0 auto;
}

.decoracion-lateral {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 32px;
}

.decoracion-lateral span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
}

.decoracion-lateral span:nth-child(2) {
    width: 24px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.6);
}

/* barra lateral formulario */
.lateral-formulario {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.contenido-formulario {
    width: 100%;
    max-width: 380px;
}

.encabezado-formulario {
    text-align: center;
    margin-bottom: 28px;
}

.icono-encabezado {
    width: 60px;
    height: 60px;
    margin: 0 auto 16px;
    background: var(--color-primario-suave);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icono-encabezado i {
    font-size: 1.6rem;
    color: var(--color-primario);
}

.encabezado-formulario h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-texto);
    margin-bottom: 4px;
}

.encabezado-formulario p {
    font-size: 0.88rem;
    color: var(--color-texto-claro);
}

/* formulario */
#formularioLogin .grupo-campo {
    margin-bottom: 18px;
}

#formularioLogin label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-texto);
    margin-bottom: 6px;
}

#formularioLogin label i {
    color: var(--color-primario-claro);
}

#formularioLogin .input-contenedor {
    position: relative;
}

#formularioLogin input {
    width: 100%;
    padding: 11px 14px;
    padding-left: 40px;
    border: 1.5px solid #e1e4e8;
    border-radius: 10px;
    font-size: 0.9rem;
    font-family: var(--fuente-principal);
    background: #fafafa;
    color: var(--color-texto);
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}

#formularioLogin input:focus {
    outline: none;
    border-color: var(--color-primario);
    box-shadow: 0 0 0 3px rgba(13, 65, 13, 0.1);
    background: var(--color-blanco);
}

#formularioLogin input.is-invalid {
    border-color: #e74c3c;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

#formularioLogin .icono-input {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-texto-claro);
    font-size: 0.9rem;
    transition: color 0.2s;
}

#formularioLogin input:focus ~ .icono-input {
    color: var(--color-primario);
}

.toggle-clave {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-texto-claro);
    cursor: pointer;
    padding: 6px;
    font-size: 0.9rem;
}

.toggle-clave:hover {
    color: var(--color-primario);
}

/* mensaje de error */
.mensaje-error-login {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background: #fdedec;
    border: 1px solid #f5b7b1;
    border-radius: 10px;
    font-size: 0.82rem;
    color: #922b21;
    margin-bottom: 18px;
    animation: sacudir 0.3s ease-out;
}

@keyframes sacudir {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-4px); }
    40% { transform: translateX(4px); }
    60% { transform: translateX(-3px); }
    80% { transform: translateX(3px); }
}

.mensaje-error-login i {
    font-size: 1rem;
    color: #e74c3c;
}

/* boton ingresar */
.btn-ingresar {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 13px 20px;
    background: linear-gradient(135deg, var(--color-primario-oscuro), var(--color-primario), var(--color-primario-claro));
    color: var(--color-blanco);
    border: none;
    border-radius: 10px;
    font-size: 0.95rem;
    font-weight: 700;
    font-family: var(--fuente-principal);
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
}

.btn-ingresar:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(13, 65, 13, 0.3);
}

.btn-ingresar:active {
    transform: translateY(0);
}

.btn-ingresar:disabled {
    opacity: 0.85;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* footer del formulario */
.pie-formulario {
    text-align: center;
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.pie-formulario p {
    font-size: 0.78rem;
    color: var(--color-texto-claro);
    line-height: 2;
}

.pie-formulario a {
    color: var(--color-texto-claro);
    text-decoration: none;
    transition: color 0.2s;
}

.pie-formulario a:hover {
    color: var(--color-primario);
}

.separador-pie {
    margin: 0 8px;
    color: #ddd;
}

.texto-copyright {
    font-size: 0.72rem !important;
    margin-top: 4px;
    opacity: 0.7;
}

/* adaptacion responsiva */
@media (max-width: 768px) {
    .lateral-institucion {
        display: none;
    }

    .tarjeta-login {
        max-width: 420px;
        min-height: auto;
    }

    .lateral-formulario {
        padding: 32px 24px;
    }

    .circulo-1,
    .circulo-2,
    .circulo-3 {
        display: none;
    }
}