:root {
    --color-negro-principal: #1a1a1a;
    --color-negro-secundario: #2d2d2d;
    --color-rojo-principal: #dc3545;
    --color-rojo-hover: #c82333;
    --color-rojo-active: #bd2130;
    --color-blanco: #ffffff;
    --color-gris-claro: #f8f9fa;
    --color-gris-medio: #6c757d;
    --color-gris-oscuro: #495057;
    --fuente-principal: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --transicion-rapida: 0.2s ease;
    --transicion-normal: 0.3s ease;
    --transicion-lenta: 0.6s ease;
}

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

body {
    font-family: var(--fuente-principal);
    background: linear-gradient(135deg, var(--color-negro-principal) 0%, #2a2a2a 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    overflow-x: hidden;
}

/* CONTENEDOR PRINCIPAL */
.login-container {
    width: 100%;
    max-width: 450px;
    animation: fadeInUp var(--transicion-lenta) ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* CARD DE LOGIN */
.login-card {
    background: var(--color-negro-secundario);
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5), 0 0 20px rgba(220, 53, 69, 0.1);
    transition: box-shadow var(--transicion-normal);
}

    .login-card:hover {
        box-shadow: 0 15px 50px rgba(0, 0, 0, 0.6), 0 0 30px rgba(220, 53, 69, 0.15);
    }

/* LOGO CON DIFUMINACION ROJA */
.logo-container {
    text-align: center;
    margin-bottom: 30px;
}

.logo-wrapper {
    position: relative;
    display: inline-block;
    margin-bottom: 16px;
}

.logo-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 140px;
    height: 140px;
    background: radial-gradient(circle, rgba(220, 53, 69, 0.4) 0%, rgba(220, 53, 69, 0.2) 30%, rgba(220, 53, 69, 0.1) 60%, transparent 100%);
    border-radius: 50%;
    filter: blur(20px);
    animation: pulse 3s ease-in-out infinite;
}

.logo-image {
    position: relative;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    z-index: 1;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }

    50% {
        opacity: 0.8;
        transform: translate(-50%, -50%) scale(1.1);
    }
}

.logo-title {
    font-size: 28px;
    font-weight: 600;
    color: var(--color-blanco);
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.logo-subtitle {
    font-size: 16px;
    color: var(--color-gris-medio);
    font-weight: 400;
}

.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--color-gris-medio) 50%, transparent 100%);
    margin: 24px 0;
}

/* FORMULARIO */
.form-label {
    color: var(--color-gris-claro);
    font-weight: 500;
    margin-bottom: 8px;
    font-size: 14px;
}

.form-control {
    background: var(--color-negro-principal);
    border: 1px solid var(--color-gris-oscuro);
    border-radius: 8px;
    color: var(--color-blanco);
    height: 48px;
    padding: 12px 16px;
    font-size: 16px;
    transition: all var(--transicion-normal);
}

    .form-control:focus {
        background: var(--color-negro-principal);
        border-color: var(--color-rojo-principal);
        box-shadow: 0 0 0 4px rgba(220, 53, 69, 0.1);
        color: var(--color-blanco);
        outline: none;
    }

    .form-control::placeholder {
        color: var(--color-gris-medio);
    }

.input-group {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-gris-medio);
    z-index: 10;
    transition: color var(--transicion-normal);
}

.form-control:focus + .input-icon {
    color: var(--color-rojo-principal);
}

.input-group .form-control {
    padding-left: 44px;
}

/* CHECKBOX Y LINKS */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 20px 0;
}

.form-check {
    display: flex;
    align-items: center;
}

.form-check-input {
    width: 18px;
    height: 18px;
    margin-right: 8px;
    cursor: pointer;
    border: 2px solid var(--color-gris-oscuro);
    background: var(--color-negro-principal);
}

    .form-check-input:checked {
        background-color: var(--color-rojo-principal);
        border-color: var(--color-rojo-principal);
    }

    .form-check-input:focus {
        box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.1);
    }

.form-check-label {
    color: var(--color-gris-claro);
    font-size: 14px;
    cursor: pointer;
    user-select: none;
}

.forgot-password {
    color: var(--color-gris-medio);
    text-decoration: none;
    font-size: 14px;
    position: relative;
    transition: color var(--transicion-normal);
}

    .forgot-password::after {
        content: '';
        position: absolute;
        width: 0;
        height: 1px;
        bottom: -2px;
        left: 0;
        background: var(--color-rojo-principal);
        transition: width var(--transicion-normal);
    }

    .forgot-password:hover {
        color: var(--color-rojo-principal);
    }

        .forgot-password:hover::after {
            width: 100%;
        }

/* BOTON PRINCIPAL */
.btn-login {
    width: 100%;
    height: 52px;
    background: linear-gradient(135deg, var(--color-rojo-principal) 0%, var(--color-rojo-hover) 100%);
    border: none;
    border-radius: 8px;
    color: var(--color-blanco);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transicion-rapida);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 24px;
}

    .btn-login:hover {
        background: linear-gradient(135deg, var(--color-rojo-hover) 0%, var(--color-rojo-active) 100%);
        transform: translateY(-2px);
        box-shadow: 0 6px 20px rgba(220, 53, 69, 0.4);
    }

    .btn-login:active {
        transform: translateY(0) scale(0.98);
    }

    .btn-login.loading {
        pointer-events: none;
        opacity: 0.8;
    }

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--color-blanco);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
}

.btn-login.loading .spinner {
    display: block;
}

.btn-login.loading .btn-text {
    display: none;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* MENSAJES DE ERROR */
.error-message {
    background: rgba(220, 53, 69, 0.1);
    border: 1px solid var(--color-rojo-principal);
    border-radius: 6px;
    padding: 12px 16px;
    margin-bottom: 20px;
    color: var(--color-rojo-principal);
    font-size: 14px;
    display: none;
    animation: shake 0.5s ease;
}

    .error-message.show {
        display: flex;
        align-items: center;
        gap: 8px;
    }

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-10px);
    }

    75% {
        transform: translateX(10px);
    }
}

.form-control.is-invalid {
    border-color: var(--color-rojo-principal);
}

.text-danger {
    color: var(--color-rojo-principal);
    font-size: 13px;
    margin-top: 4px;
    display: block;
}

/* FOOTER */
.login-footer {
    text-align: center;
    margin-top: 30px;
    color: var(--color-gris-medio);
    font-size: 14px;
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .login-card {
        padding: 30px 24px;
    }

    .logo-image {
        width: 80px;
        height: 80px;
    }

    .logo-glow {
        width: 120px;
        height: 120px;
    }

    .logo-title {
        font-size: 24px;
    }

    .logo-subtitle {
        font-size: 14px;
    }

    .form-options {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: 24px 20px;
    }

    .btn-login {
        height: 48px;
        font-size: 15px;
    }
}

/* Selector de sucursales */
.sucursales-selector {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sucursal-opcion {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    background: rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.85);
    user-select: none;
}

    .sucursal-opcion:hover {
        border-color: #dc3545;
        background: rgba(220, 53, 69, 0.1);
    }

    .sucursal-opcion.seleccionada {
        border-color: #dc3545;
        background: rgba(220, 53, 69, 0.15);
        color: #fff;
        font-weight: 600;
    }

.sucursal-icono {
    font-size: 22px;
    color: #dc3545;
    min-width: 28px;
    text-align: center;
    flex-shrink: 0;
}

.sucursal-nombre {
    font-size: 15px;
    flex: 1;
}

.sucursal-check {
    margin-left: auto;
    font-size: 18px;
    color: #dc3545;
    opacity: 0;
    transition: opacity 0.2s ease;
    flex-shrink: 0;
}

.sucursal-opcion.seleccionada .sucursal-check {
    opacity: 1;
}

/* muchas sucursales — grid en pantallas grandes */
@media (min-width: 768px) {
    .sucursales-selector {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
}

@media (min-width: 1200px) {
    .sucursales-selector {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* movil — columna unica, padding mas comodo para touch */
@media (max-width: 767px) {
    .sucursal-opcion {
        padding: 16px;
        font-size: 15px;
    }

    .sucursal-icono {
        font-size: 24px;
    }

    .sucursal-check {
        font-size: 20px;
    }
}

/* selector — card mas ancha para acomodar grid */
.login-container.selector-container {
    max-width: 620px;
}

/* grid solo cuando hay espacio real */
@media (min-width: 768px) {
    .sucursales-selector {
        grid-template-columns: repeat(2, 1fr);
        justify-content: center;
        max-width: 420px;
        margin: 0 auto;
    }
}

@media (min-width: 1000px) {
    .login-container.selector-container .sucursales-selector {
        grid-template-columns: repeat(3, 1fr);
    }
}