* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #1a1a1a;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  touch-action: none;
}

canvas {
  display: block;
  cursor: default;
}

/* 説明バナー */
.instruction-banner {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(74, 144, 226, 0.95);
  color: white;
  padding: 12px 24px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  z-index: 200;
  transition: opacity 0.4s, transform 0.4s;
}

.instruction-banner.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(-20px);
}

.instruction-text {
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.separator {
  color: rgba(255, 255, 255, 0.5);
}

/* コントロールパネル */
.control-panel {
  position: fixed;
  right: 20px;
  bottom: 40px;
  background: rgba(30, 30, 30, 0.95);
  border: 2px solid #444;
  border-radius: 12px;
  padding: 16px;
  color: #fff;
  font-size: 14px;
  min-width: 240px;
  max-width: 260px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  z-index: 100;
}

/* 画面幅が狭い時の対応 */
@media (max-width: 768px) or (max-height: 600px) {
  .control-panel {
    right: 10px;
    bottom: 50px;
    min-width: 200px;
    max-width: 220px;
    padding: 12px;
    font-size: 12px;
  }
}

.panel-title {
  font-size: 16px;
  font-weight: bold;
  margin-bottom: 12px;
  color: #4a90e2;
  border-bottom: 2px solid #4a90e2;
  padding-bottom: 8px;
}

.function-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 4px;
  margin-bottom: 4px;
  border-radius: 4px;
  transition: background 0.2s;
}

.function-item:hover {
  background: rgba(74, 144, 226, 0.1);
}

.function-item label {
  display: flex;
  align-items: center;
  cursor: pointer;
  flex: 1;
}

.function-checkbox {
  margin-right: 10px;
  cursor: pointer;
  width: 18px;
  height: 18px;
}

.function-formula {
  font-family: 'Segoe UI', 'Cambria Math', serif;
  font-size: 14px;
  color: #ddd;
  user-select: none;
}

.color-indicator {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  flex-shrink: 0;
}

.zoom-info {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid #444;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.info-label {
  font-size: 12px;
  color: #aaa;
}

.zoom-value {
  font-size: 14px;
  font-weight: bold;
  color: #4a90e2;
}

#resetBtn {
  width: 100%;
  padding: 10px;
  margin-top: 12px;
  background: #4a90e2;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.3s;
}

#resetBtn:hover {
  background: #357abd;
}

#resetBtn:active {
  background: #2d6aa3;
}

.error-mode-section {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid #444;
}

.error-mode-section label {
  display: flex;
  align-items: center;
  cursor: pointer;
  font-size: 13px;
  margin-bottom: 8px;
}

.error-mode-section input[type="checkbox"] {
  margin-right: 8px;
  cursor: pointer;
}

.error-warning {
  background: rgba(255, 150, 0, 0.2);
  color: #ffaa44;
  padding: 8px;
  border-radius: 4px;
  font-size: 12px;
  margin-top: 8px;
  text-align: center;
}

.error-value {
  background: rgba(74, 144, 226, 0.2);
  color: #4a90e2;
  padding: 8px;
  border-radius: 4px;
  font-size: 13px;
  margin-top: 8px;
  text-align: center;
  font-weight: bold;
}

/* 最終更新表示 */
.last-updated {
  position: fixed;
  bottom: 10px;
  left: 10px;
  font-size: 12px;
  color: #666;
  z-index: 50;
}

/* スクリーンショットボタン */
.screenshot-btn {
  position: fixed;
  bottom: 10px;
  right: 10px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(74, 144, 226, 0.8);
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
  z-index: 150;
}

.screenshot-btn:hover {
  background: rgba(74, 144, 226, 1);
  transform: scale(1.1);
}

.screenshot-btn:active {
  transform: scale(0.95);
}