/* ======= GENERAL ======= */
    body {
        background-color: #343541 !important;
        color: #ececf1;
        font-family: Arial, sans-serif;
    }

    /* ======= DROPDOWN MENU ======= */
    .dropdown-menu {
        z-index: 9999;
        background-color: #1f1f1f;
        color: white;
        border: 1px solid #333;
    }
    .dropdown-menu .dropdown-item {
        color: #adadad;
    }
    .dropdown-menu .dropdown-item:hover {
        background-color: #343541;
        color: #0d6efd;
    }

    /* ======= TARJETAS DEL DASHBOARD ======= */
    .card {
        background-color: #202123;
        color: #ffffff;
        border: none;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .card:hover {
        transform: translateY(-5px);
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
    }
    .card i {
        transition: transform 0.4s ease;
        color: #0d6efd;
    }
    .card:hover i {
        transform: rotate(10deg) scale(1.2);
    }

    /* ======= FORMULARIOS (LOGIN/REGISTRO) ======= */
    .auth-form-container {
        max-width: 400px;
        width: 100%;
        padding: 2rem;
        background-color: #1e1e1e;
        border-radius: 16px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
    }
    .auth-form-container h2 {
        text-align: center;
        margin-bottom: 1.5rem;
        color: #ffffff;
    }
    .auth-form-container .form-group {
        margin-bottom: 1rem;
    }
    .auth-form-container .form-control,
    .panel-cuenta-container .form-control {
        background-color: #2c2c2c;
        border: 1px solid #444;
        color: #fff;
    }
    .auth-form-container .form-control:focus,
    .panel-cuenta-container .form-control:focus {
        border-color: #0d6efd;
        box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
    }
    .auth-form-container a {
        color: #0d6efd;
    }
    .auth-form-container a:hover {
        text-decoration: underline;
    }

    /* ======= BOTONES ======= */
    .btn-custom {
        background-color: #3498db;
        color: white;
        padding: 6px 0;
        font-size: 16px;
        font-weight: 400;
        border-radius: 4px;
        border: none;
        transition: all 0.3s ease;
        box-shadow: 0 2px 5px rgba(52, 152, 219, 0.3);
    }
    .btn-custom:hover,
    .navbar .btn:hover {
        background-color: #0b5ed7;
        transform: scale(1.05);
    }
    .navbar .btn {
        background-color: #0d6efd;
        color: #ffffff;
        border: none;
        transition: background-color 0.3s, transform 0.2s;
    }

    /* ======= LINKS ======= */
    a {
        color: #0d6efd;
        text-decoration: none;
    }
    a:hover {
        color: #66b2ff;
    }

    /* ======= PANEL DE CUENTA ======= */
    .panel-cuenta-container {
        max-width: 700px;
        margin: 2rem auto;
        background-color: #1e1e1e;
        padding: 2rem;
        border-radius: 16px;
        box-shadow: 0 0 20px rgba(0, 0, 0, 0.6);
    }
    .panel-cuenta-container h3 {
        margin-bottom: 1.5rem;
        color: #ffffff;
        border-bottom: 1px solid #444;
        padding-bottom: 0.5rem;
    }
    .panel-cuenta-container .btn {
        margin-top: 1rem;
    }

    /* ======= VALIDACIÓN DE ANILLOS ======= */
    #anillo_numero.valid {
        border: 2px solid #28a745;
        box-shadow: 0 0 0 0.2rem rgba(40, 167, 69, 0.25);
    }
    #anillo_numero.invalid {
        border: 2px solid #dc3545;
        box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
    }
    #anillo_anio {
        background-color: #f8f9fa;
        cursor: not-allowed;
    }
    .valid-feedback,
    .invalid-feedback {
        display: none;
        font-size: 0.875em;
    }
    .valid-feedback {
        color: #28a745;
    }
    .invalid-feedback {
        color: #dc3545;
    }
    #anillo_numero.valid ~ .valid-feedback {
        display: block;
    }
    #anillo_numero.invalid ~ .invalid-feedback {
        display: block;
    }
    /* Spinner de validación */
    .loading-spinner {
        display: none;
        position: absolute;
        right: 10px;
        top: 50%;
        transform: translateY(-50%);
    }
    #anillo_numero.loading + .loading-spinner {
        display: block;
    }