/* ==========================================================================
   battle.css
   戦場(Canvas) / 詠唱エリア(Tier選択・ワード表示)
   ========================================================================== */

#battlefield {
  flex: 1 1 0;
  background: linear-gradient(180deg, #a8dff0 0%, #d6f1e3 50%, #88c179 100%);
  position: relative;
  min-height: 280px;
  overflow: hidden;
}
#canvas { width: 100%; height: 100%; display: block; }

#casting {
  background: var(--bg-alt);
  padding: 16px 20px;
  border-top: 0;
  border-bottom: 1px solid var(--border);
  box-shadow: none;
}

.tier-selector { display: flex; gap: 10px; margin-bottom: 14px; }
.tier-btn {
  flex: 1;
  padding: 17px 18px;
  background: var(--bg-alt);
  border: 2px solid transparent;
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 17px;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.tier-btn:hover { background: var(--bg); }
.tier-btn.active { background: var(--bg); box-shadow: none; }
.tier-btn.tier1.active { border-color: var(--tier1); }
.tier-btn.tier2.active { border-color: var(--tier2); }
.tier-btn.tier3.active { border-color: var(--tier3); }
.tier-btn kbd {
  display: inline-block;
  padding: 6px 12px;
  background: var(--text);
  color: var(--panel);
  border-radius: 4px;
  font-size: 15px;
  font-weight: bold;
}
.tier-btn .tier-label {
  font-size: 18px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.tier-btn.tier1 .tier-label { color: #3b8f6f; }
.tier-btn.tier2 .tier-label { color: #b8791f; }
.tier-btn.tier3 .tier-label { color: #a84f3d; }
.tier-btn.active .tier-label {
  text-shadow: 0 0 0.01px currentColor;
}

#word-display {
  font-family: var(--font-mono);
  font-size: 36px;
  letter-spacing: 2px;
  text-align: center;
  padding: 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  flex-wrap: wrap;
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: break-word;
  line-height: 1.25;
}
#word-display .done { color: var(--text-dim); }
#word-display .current {
  color: var(--accent);
  background: rgba(58,138,106,0.2);
  border-radius: 3px;
  padding: 0 2px;
}
#word-display .todo { color: var(--text); }
#word-display.miss-flash { animation: shake 0.2s; }
@keyframes shake {
  0%,100% { transform: translateX(0); }
  25% { transform: translateX(-3px); }
  75% { transform: translateX(3px); }
}