/* ===== Tema Netflix: negro + rojo ===== */
:root {
    --rojo: #e50914;
    --rojo-hover: #f6121d;
    --gris: #333;
    --suave: #b3b3b3;
    --alerta: #e87c03;
}

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

body {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: #000;
    color: #fff;
}

/* Fondo: degradado oscuro con un resplandor rojo */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: 
        linear-gradient(rgba(0,0,0,.65), rgba(0,0,0,.95)),
        radial-gradient(circle at 15% 10%, #6b060c, #141414 65%);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 5%;
}

.logo {
    color: var(--rojo);
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: 3px;
    text-decoration: none;
}

.btn-nav {
    background: var(--rojo);
    color: #fff;
    text-decoration: none;
    padding: 7px 16px;
    border-radius: 4px;
    font-size: .9rem;
}
.btn-nav:hover { background: var(--rojo-hover); }

.main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 10px 16px 50px;
}

/* Tarjeta del formulario */
.card {
    width: 100%;
    max-width: 450px;
    background: rgba(0,0,0,.78);
    padding: 50px 60px 40px;
    border-radius: 6px;
}
.card-ancha { max-width: 560px; }

.card h1 { font-size: 2rem; margin-bottom: 24px; }
.sub { color: var(--suave); margin: -14px 0 22px; }

/* Campos */
.input-group { margin-bottom: 16px; border: none; }

label, legend {
    display: block;
    font-size: .85rem;
    color: var(--suave);
    margin-bottom: 6px;
}

input[type="text"], input[type="email"], input[type="password"],
input[type="tel"], input[type="date"], select {
    width: 100%;
    background: var(--gris);
    color: #fff;
    border: none;
    border-bottom: 2px solid transparent;
    border-radius: 4px;
    padding: 14px 16px;
    font-size: 1rem;
}
input:focus, select:focus { outline: 2px solid #fff; }
input:user-invalid, select:user-invalid { border-bottom-color: var(--alerta); }
::placeholder { color: #8c8c8c; }
input[type="date"] { color-scheme: dark; }

.fila-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* Botón principal */
.btn-submit {
    width: 100%;
    background: var(--rojo);
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 14px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    margin-top: 10px;
}
.btn-submit:hover { background: var(--rojo-hover); }

.mensaje { margin-top: 12px; font-size: .9rem; color: #46d369; min-height: 1.2em; }

/* Checkboxes y radios */
.check { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; margin: 0; }
.check-terminos { margin: 6px 0 4px; font-size: .85rem; }
input[type="checkbox"], input[type="radio"] { accent-color: var(--rojo); }
.generos { display: flex; gap: 18px; flex-wrap: wrap; }

.row-help { display: flex; justify-content: space-between; align-items: center; margin-top: 14px; font-size: .85rem; }
.link-suave { color: var(--suave); text-decoration: none; }
.link-suave:hover { text-decoration: underline; }

/* Planes */
.planes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.plan {
    display: flex;
    flex-direction: column;
    gap: 3px;
    background: var(--gris);
    border: 2px solid transparent;
    border-radius: 6px;
    padding: 12px;
    cursor: pointer;
    margin: 0;
}
.plan:has(input:checked) { border-color: var(--rojo); }
.plan-nombre { color: #fff; font-weight: 700; font-size: .95rem; }
.plan-desc { font-size: .78rem; color: var(--suave); }

/* Pie */
.footer-card { margin-top: 24px; color: var(--suave); }
.footer-card a { color: #fff; text-decoration: none; }
.footer-card a:hover { text-decoration: underline; }
.legal { margin-top: 14px; font-size: .75rem; color: #737373; }

@media (max-width: 600px) {
    .card { padding: 30px 20px; background: transparent; }
    .fila-2, .planes { grid-template-columns: 1fr; }
}