/* ===== BASE ===== */
html, body { height: 100%; }

body {
  display: flex;
  align-items: center;
  padding-top: 40px;
  padding-bottom: 40px;
  background: #121212 url("https://chat.qsoftware.biz/styles/bg.jpg") no-repeat center/cover fixed;
  color: #ffffff;
}

/* ===== LOGIN ===== */
.form-signin {
  max-width: 330px;
  padding: 15px;
}
.form-signin .form-floating:focus-within { z-index: 2; }
.form-signin input[type="email"] {
  margin-bottom: -1px;
  border-bottom-right-radius: 0;
  border-bottom-left-radius: 0;
}
.form-signin input[type="password"] {
  margin-bottom: 10px;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}
.card {                  /* tarjeta semitransparente */
  background: rgba(255,255,255,.85);
  border: none;
  border-radius: .75rem;
}

/* ===== BOTONES GLOBALES ===== */
.btn { border: 1px solid rgba(255,255,255,.25); }
.nav-buttons .btn { color: #fff !important; }
.btn-light { background-color: #343a40; color: #fff !important; }
.btn-dark  { background-color: #000;    color: #fff !important; }

/* ===== MENÚ ===== */
.nav-buttons { margin-bottom: 15px; }
.welcome-txt { color: #ffffff; font-size: 1.1rem; }

/* ===== IFRAME ===== */
.iframe-container {
  position: relative;
  width: 100%;
  height: calc(100vh - 200px);
  margin-top: 20px;
  border-color: #444;
}
.iframe-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: .375rem;
}

/* ===== BOTÓN SUBIR ===== */
.btn-subir {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 100;
  display: none;
}