:root {
    --color-bg-dark: #121212;
    --color-surface: #1e1e1e;
    --color-border: #2c2c2c;
    --color-accent: #3d8bfd;
    --color-accent-hover: #2a6edc;
    --color-focus: #66b2ff;
    --color-error: #ff6b6b;
    --color-text-main: #eaeaea;
    --color-text-muted: #9e9e9e;
    --color-card-bg: #1a1a1a;
}

/* ==== BODY ==== */
body {
    font-family: 'Nunito', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--color-bg-dark);
    color: var(--color-text-main);
}

/* ==== CONTENEDOR PRINCIPAL ==== */
.form-container {
    max-width: 600px;
    margin: 60px auto;
    padding: 40px 30px;
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
}

/* ==== TÍTULO ==== */
h1,
.form-tittle {
    text-align: center;
    font-size: 2.2rem;
    text-transform: uppercase;
    font-weight: bold;
    letter-spacing: 1px;
    color: var(--color-accent);
    margin-bottom: 2rem;
}

/* ==== INPUTS, SELECTS, TEXTAREAS ==== */
.form-control,
.form-select,
textarea,
input[type="file"] {
    width: 100%;
    padding: 14px;
    background-color: #181818;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--color-text-main);
    margin-bottom: 1.3rem;
    caret-color: var(--color-accent);
    transition: border-color 0.2s ease;
}

.form-control:focus,
.form-select:focus,
textarea:focus,
input[type="file"]:focus {
    background-color: #202020;
    border-color: var(--color-focus);
    color: var(--color-text-main);
    outline: none;
}

/* ==== ARCHIVO ==== */
input[type="file"] {
    border-style: dashed;
    cursor: pointer;
}

input[type="file"]:hover {
    border-color: var(--color-accent-hover);
}

/* ==== PLACEHOLDER ==== */
::placeholder {
    color: var(--color-text-muted);
    opacity: 1;
}

/* ==== FORZAR MODO OSCURO ==== */
input,
select,
textarea {
    color-scheme: dark;
}

/* ==== LABELS ==== */
.form-label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-muted);
}

/* ==== BOTÓN ==== */
.btn-custom {
    background-color: var(--color-accent);
    color: white;
    padding: 16px;
    font-size: 1.1rem;
    border: none;
    border-radius: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.btn-custom:hover {
    background-color: var(--color-accent-hover);
}

.btn-custom:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(61, 139, 253, 0.4);
}

/* ==== CAMPOS OPCIONALES (COLLAPSE) ==== */
.card.card-body {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 1.5rem;
    color: var(--color-text-main);
}

/* ==== CHECKBOX & LINKS ==== */
.form-check-input {
    accent-color: var(--color-accent);
    border: 1px solid var(--color-border);
    transform: scale(1.1);
}

.form-check-label a {
    color: var(--color-accent);
    text-decoration: underline;
}

.form-check-label a:hover {
    color: var(--color-focus);
}

a.option-link {
    display: block;
    text-align: center;
    margin-top: 1.5rem;
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
}

a.option-link:hover {
    text-decoration: underline;
    color: var(--color-focus);
}

/* ==== ERRORES Y MENSAJES ==== */
small[style*="color: red"],
.alert-danger {
    color: var(--color-error) !important;
    font-weight: 600;
    font-size: 0.9rem;
    margin-top: -0.5rem;
}

/* ==== RESPONSIVE ==== */
@media screen and (max-width: 768px) {
    .form-container {
        padding: 30px 20px;
        margin: 30px 15px;
    }

    h1,
    .form-tittle {
        font-size: 1.8rem;
    }

    .btn-custom {
        font-size: 1rem;
        padding: 14px;
    }
}

@media screen and (max-width: 480px) {
    .form-container {
        max-width: 95%;
    }
}

.btn-google {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    border: 1.5px solid #dadce0;
    border-radius: 4px;
    padding: 10px 15px;
    font-weight: 600;
    color: #202124;
    text-decoration: none;
    font-size: 16px;
    transition: background-color 0.3s ease, box-shadow 0.2s ease;
    box-shadow: 0 1px 2px rgb(0 0 0 / 0.05);
    cursor: pointer;
    user-select: none;
}

.btn-google svg {
    margin-right: 10px;
    width: 20px;
    height: 20px;
}

.btn-google:hover,
.btn-google:focus {
    background-color: #f7f8f8;
    border-color: #c6c6c6;
    box-shadow: 0 2px 6px rgb(60 64 67 / 0.3);
    text-decoration: none;
    color: #202124;
}

.btn-google:active {
    background-color: #e8e8e8;
    box-shadow: none;
}

.btn-google:focus-visible {
    outline: 2px solid #4285f4;
    outline-offset: 2px;
}

.separator {
    display: flex;
    align-items: center;
    margin: 20px 0;
    color: #666;
    font-family: monospace;
    font-weight: 600;
}

.separator::before,
.separator::after {
    content: "";
    flex: 1;
    border-bottom: 1px solid #666;
    margin: 0 10px;
}

.separator span {
    user-select: none;
}