function calcFee() {
  var hallType = document.getElementById('hallType').value;
  var timeSlot = document.getElementById('timeSlot').value;
  var dayType  = document.getElementById('dayType').value;
  var aircon   = document.getElementById('aircon').value;
  var profit   = Number(document.getElementById('profit').value);
  var advance  = document.getElementById('advance').value;
  var extend   = document.getElementById('extend').value;

  var feeHallAll = {
    morning: 24180, afternoon: 32820, night: 38000,
    daytime: 48370, day_night: 70820, allday: 86370
  };
  var feeHall1F = {
    morning: 19000, afternoon: 25900, night: 31090,
    daytime: 38000, day_night: 57000, allday: 69090
  };
  var feeHallPrep = {
    morning: 12090, afternoon: 16410, night: 19000,
    daytime: 24185, day_night: 35410, allday: 43185
  };

  var hours = {
    morning: 3, afternoon: 4, night: 4,
    daytime: 8, day_night: 9, allday: 13
  };

  var base = 0;
  if (hallType === 'hall_all') base = feeHallAll[timeSlot];
  if (hallType === 'hall_1f')  base = feeHall1F[timeSlot];
  if (hallType === 'hall_prep') base = feeHallPrep[timeSlot];

  var addHoliday = (dayType === 'holiday') ? Math.round(base * 0.2) : 0;
  var addAircon  = (aircon === 'yes') ? Math.round(base * 0.5) : 0;

  var fee4 = base + addHoliday + addAircon;

  var addProfit = Math.round(base * profit);

  var count = 0;
  if (advance === 'yes') count++;
  if (extend === 'yes') count++;

  var finalFee = fee4 + addProfit;

  if (count > 0) {
    var extra = Math.floor((fee4 / hours[timeSlot]) * 1.3 * count);
    finalFee += extra;
  }

  // ★ 最終結果だけ一の位を切り捨て（10円単位）
  finalFee = Math.floor(finalFee / 10) * 10;

  document.getElementById('hallResult').innerText = finalFee.toLocaleString();
}