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

body {
  background: #1a1a2e;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  font-family: 'Courier New', monospace;
  overflow: hidden;
}

@media (max-width: 600px) {
  body {
    align-items: flex-start;
  }
}

#wrap {
  position: relative;
  user-select: none;
}

#gameCanvas {
  display: block;
  border: 2px solid #2a2a4a;
  cursor: default;
  box-shadow: 0 0 40px rgba(74, 144, 217, 0.25);
  /* モバイルでは画面幅に合わせて縮小 */
  width: min(600px, 100vw);
  height: min(600px, 100vw);
}

/* ─── ? ボタン ─── */
.btn-howto {
  position: absolute;
  top: 8px;
  left: 8px;
  width: auto;
  min-width: 64px;
  height: auto;
  min-height: 28px;
  padding: 4px 10px;
  border-radius: 14px;
  border: 1.5px solid #2a2a4a;
  background: rgba(26, 26, 46, 0.85);
  color: #a0a0b0;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  -webkit-tap-highlight-color: transparent;
  white-space: nowrap;
  line-height: 1.2;
  text-align: center;
}
.btn-howto:active { opacity: 0.7; }

/* ─── モーダル ─── */
.te-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 100;
  padding: 0 16px 16px;
  backdrop-filter: blur(4px);
}
.te-modal.hidden { display: none; }

.te-modal-content {
  background: #16213e;
  border-radius: 24px 24px 16px 16px;
  padding: 24px 20px;
  width: 100%;
  max-width: 480px;
  box-shadow: 0 -8px 40px rgba(0, 0, 0, 0.5);
  animation: teSlideUp 0.3s ease;
  max-height: 80vh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}
@keyframes teSlideUp {
  from { transform: translateY(60px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.te-howto-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.te-howto-header h2 {
  font-size: 1.1rem;
  font-weight: 700;
  font-family: 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
  background: linear-gradient(135deg, #4A90D9, #F5A623);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.te-modal-close {
  background: none;
  border: none;
  color: #a0a0b0;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
  font-family: inherit;
}

.te-howto-section {
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid #2a2a4a;
  font-family: 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
}
.te-howto-section:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.te-howto-section h3 {
  font-size: 0.9rem;
  font-weight: 700;
  color: #4A90D9;
  margin-bottom: 8px;
}
.te-howto-section p {
  font-size: 0.85rem;
  color: #a0a0b0;
  line-height: 1.6;
}

.te-enemy-list { display: flex; flex-direction: column; gap: 10px; }
.te-enemy-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: #a0a0b0;
  line-height: 1.4;
}
.te-enemy-row span:first-child {
  font-size: 1.3rem;
  width: 28px;
  text-align: center;
  flex-shrink: 0;
}
.te-enemy-row strong { color: #F5A623; }

.te-note {
  margin-top: 10px;
  background: rgba(245, 166, 35, 0.1);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.82rem;
  color: #a0a0b0;
  line-height: 1.5;
}
.te-note strong { color: #F5A623; }

.te-footer {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 16px 20px;
}

.te-footer-link {
  display: inline-block;
  padding: 7px 16px;
  border-radius: 20px;
  background: rgba(74, 144, 217, 0.12);
  border: 1px solid rgba(74, 144, 217, 0.35);
  color: #4A90D9;
  font-size: 0.82rem;
  text-decoration: none;
  transition: background 0.2s;
}
.te-footer-link:hover { background: rgba(74, 144, 217, 0.24); }