/* ===============================
   WebGL UI PANEL
   =============================== */

#ui {
  background: rgba(17, 26, 33, 0.92);
  border: 1px solid #29465a;
  box-shadow: 0 0 16px rgba(0,0,0,0.75);
  border-radius: 8px;

  font-family: 'Roboto Condensed', sans-serif;
  color: #ffffff;

  min-width: 220px;
}

/* Section labels */
#ui label {
  display: block;
  font-size: 0.9rem;
  color: #FFC107;
  margin-top: 10px;
}

/* ===============================
   Physics dropdown (native select)
   =============================== */

#physicsMode {
  width: 100%;
  margin-top: 6px;

  background-color: #222831;
  color: #ffffff;

  border: 1px solid #157ec4;
  border-radius: 6px;

  padding: 6px 10px;

  font-family: 'Roboto Condensed', sans-serif;
  font-size: 0.95rem;

  cursor: pointer;
}

#physicsMode:focus {
  outline: none;
  border-color: #FFC107;
  box-shadow: 0 0 0 1px #FFC107;
}

/* ===============================
   Materialize checkboxes (styled)
   =============================== */

#ui .ui-check {
  margin-top: 8px;
}

/* label text */
#ui .ui-check span {
  color: #ffffff;
  font-size: 0.9rem;
}

/* checkbox box (unchecked) */
#ui .ui-check input[type="checkbox"] + span:before {
  border: 2px solid #157ec4;
  background-color: transparent;
}

/* checkbox box (checked) */
#ui .ui-check input[type="checkbox"]:checked + span:before {
  border-right: 2px solid #FFC107;
  border-bottom: 2px solid #FFC107;
}

/* checkmark */
#ui .ui-check input[type="checkbox"]:checked + span:after {
  border-right: 2px solid #FFC107;
  border-bottom: 2px solid #FFC107;
}

/* hover */
#ui .ui-check span:hover:before {
  border-color: #FFC107;
}

/* ===============================
   Button
   =============================== */

#clearRaysBtn {
  margin-top: 12px;
  width: 100%;
  padding: 6px 0;

  background-color: #FFC107;
  color: #222831;

  border: none;
  border-radius: 4px;

  font-family: 'Roboto Condensed', sans-serif;
  font-weight: 700;
  letter-spacing: 0.08em;

  cursor: pointer;
}

#clearRaysBtn:hover {
  background-color: #ffce3a;
}