* { box-sizing: border-box; margin: 0; padding: 0; font-family: -apple-system, "Segoe UI", Arial, sans-serif; }
body {
    background: #0b0c14;
    color: #d8d8e8;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.tarjeta {
    background: #151621;
    border-radius: 16px;
    padding: 32px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.4);
}
h1 { font-size: 22px; margin-bottom: 6px; text-align: center; }
.subtitulo { color: #8a8aa3; font-size: 14px; text-align: center; margin-bottom: 24px; }
label { display: block; font-size: 13px; color: #b0b0c8; margin: 14px 0 6px; }
input {
    width: 100%;
    padding: 11px 12px;
    border-radius: 8px;
    border: 1px solid #2a2b3d;
    background: #0f1019;
    color: #fff;
    font-size: 14px;
}
input:focus { outline: none; border-color: #6d5aff; }
button {
    width: 100%;
    margin-top: 22px;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background: #6d5aff;
    color: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
}
button:hover { background: #5a47e8; }
button:disabled { background: #3a3a4d; cursor: not-allowed; }
.enlace { text-align: center; margin-top: 18px; font-size: 13px; color: #8a8aa3; }
.enlace a { color: #8a78ff; text-decoration: none; }
.mensaje-error {
    background: #3a1620; color: #ff8a8a; padding: 10px 12px;
    border-radius: 8px; font-size: 13px; margin-top: 14px; display: none;
}
.mensaje-ok {
    background: #163a20; color: #8aff9e; padding: 10px 12px;
    border-radius: 8px; font-size: 13px; margin-top: 14px; display: none;
}

/* --- CHAT --- */
body.chat-body { display: block; padding: 0; }
.chat-contenedor {
    max-width: 760px;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
}
.chat-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 20px; border-bottom: 1px solid #202132;
}
.chat-header h2 { font-size: 16px; }
.chat-header button {
    width: auto; margin: 0; padding: 8px 14px; font-size: 13px;
    background: #20222f;
}
.chat-header button:hover { background: #2c2e40; }
.mensajes { flex: 1; overflow-y: auto; padding: 20px; }
.burbuja {
    max-width: 75%; padding: 10px 14px; border-radius: 14px;
    margin-bottom: 12px; font-size: 14.5px; line-height: 1.5; white-space: pre-wrap;
}
.burbuja.usuario { background: #6d5aff; color: white; margin-left: auto; border-bottom-right-radius: 4px; }
.burbuja.asistente { background: #1c1d2b; margin-right: auto; border-bottom-left-radius: 4px; }
.burbuja.sistema { background: transparent; color: #8a8aa3; text-align: center; margin: 8px auto; font-size: 12.5px; max-width: 100%; }
.input-zona { display: flex; gap: 10px; padding: 16px 20px; border-top: 1px solid #202132; }
.input-zona input {
    flex: 1;
}
.input-zona button { width: auto; margin: 0; padding: 0 20px; }