* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #f5f5f5;
    color: #222;
}

.pantalla {
    max-width: 480px;
    margin: 0 auto;
    padding: 24px 16px 48px;
    min-height: 100vh;
}

.tarjeta {
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

h2 {
    font-size: 1.3rem;
    margin-bottom: 20px;
}

.lista-opciones {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

form {
    margin: 0;
}

.opcion,
.boton-principal {
    width: 100%;
    padding: 16px;
    font-size: 1rem;
    border: 1px solid #ddd;
    border-radius: 10px;
    background: white;
    cursor: pointer;
    text-align: left;
}

.opcion:active,
.boton-principal:active {
    background: #eee;
}

.boton-principal {
    background: #222;
    color: white;
    text-align: center;
    font-weight: 600;
    border: none;
    margin-top: 16px;
}

.boton-secundario {
    margin-top: 10px;
    text-align: center;
}

.subtitulo {
    color: #666;
    margin-top: -12px;
    margin-bottom: 16px;
}

.atras {
    margin-top: 20px;
    text-align: center;
}

.atras a {
    color: #666;
    text-decoration: none;
    font-size: 0.9rem;
}

.barra-progreso {
    height: 6px;
    background: #e5e5e5;
    border-radius: 3px;
    margin-bottom: 20px;
    overflow: hidden;
}

.barra-progreso-relleno {
    height: 100%;
    background: #222;
    transition: width 0.2s ease;
}

.lista-checkbox {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 16px;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background: white;
}

.checkbox input {
    width: 18px;
    height: 18px;
}

.error {
    color: #c0392b;
    font-weight: 600;
}

textarea,
input[type="email"] {
    width: 100%;
    padding: 14px;
    font-size: 1rem;
    border: 1px solid #ddd;
    border-radius: 10px;
    font-family: inherit;
    margin-bottom: 10px;
}