/* 数学飞机大战 - 样式文件 */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  touch-action: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}

body {
  background: #1a1a2e;
  overflow: hidden;
  font-family: 'Courier New', monospace;
}

#aim-toggle {
  z-index: 101;
  position: relative;
  cursor: pointer;
  background: rgba(255, 215, 0, 0.3);
}

.control-btn {
  width: 70px;
  height: 70px;
  background: rgba(255, 215, 0, 0.2);
  border: 3px solid #ffd700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  color: #ffd700;
  cursor: pointer;
  transition: all 0.3s ease;
  pointer-events: auto;
}

.touch-hint {
  transition: opacity 0.3s ease;
}

#gameCanvas {
  display: block;
  background: linear-gradient(180deg, #0f0f23 0%, #1a1a2e 100%);
}

/* UI层 */
#ui-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* 顶部信息栏 */
#hud {
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  display: flex;
  justify-content: space-between;
  color: #fff;
  text-shadow: 2px 2px 0 #000;
  z-index: 100;
  pointer-events: auto;
  font-size: 12px;
  gap: 5px;
}

.hud-item {
  background: rgba(0, 0, 0, 0.5);
  padding: 4px 8px;
  border-radius: 4px;
  border: 2px solid #ffd700;
}

/* 数学题目区域 */
#math-panel {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.8);
  border: 2px solid #ffd700;
  border-radius: 8px;
  text-align: center;
  bottom: 170px;
  padding: 8px 15px;
  min-width: 140px;
}

#question {
  color: #fff;
  font-size: 18px;
  margin-bottom: 4px;
  font-weight: bold;
}

#answer-display {
  color: #ffd700;
  font-size: 20px;
  min-height: 26px;
  letter-spacing: 4px;
}

/* 数字键盘 */
#keypad {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: grid;
  grid-template-columns: repeat(6, 48px);
  grid-template-rows: repeat(2, 50px);
  gap: 6px;
  padding: 10px;
  background: rgba(0, 0, 0, 0.6);
  border-radius: 10px;
  pointer-events: auto;
}

.key {
  width: 48px;
  height: 50px;
  font-size: 20px;
  background: linear-gradient(145deg, #2a2a4a, #1a1a2e);
  border: 2px solid #444;
  border-radius: 8px;
  color: #fff;
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.1s;
  box-shadow: 0 4px 0 #000;
}

.key:active {
  transform: translateY(4px);
  box-shadow: 0 0 0 #000;
}

/* 0占两格 */
.key[data-num="0"] {
  grid-column: span 2;
  width: 102px;
}

/* 清除按钮红色 */
.key.clear {
  background: linear-gradient(145deg, #4a2a2a, #2a1a1a);
  border-color: #ff4444;
  color: #ff4444;
}

.key.ok {
  border-color: #ffd700;
  color: #ffd700;
  grid-column: span 3;
  width: 162px;
  background: linear-gradient(145deg, #2a5a2a, #1a3a1a);
}

/* 方向键 */
#controls {
  position: absolute;
  bottom: 250px;
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 0 20px;
  pointer-events: auto;
  display: none;
}

.control-btn {
  width: 70px;
  height: 70px;
  background: rgba(255, 215, 0, 0.2);
  border: 3px solid #ffd700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  color: #ffd700;
  cursor: pointer;
  transition: all 0.1s;
}

.control-btn:active {
  background: rgba(255, 215, 0, 0.5);
  transform: scale(0.95);
}

/* 连击显示 */
#combo {
  position: absolute;
  top: 50px;
  right: 10px;
  left: auto;
  transform: none;
  text-align: right;
  font-size: 16px;
  text-shadow: 2px 2px 0 #000;
  pointer-events: none;
}

#combo.show {
  opacity: 1;
}

/* 彩蛋提示 */
#easter-egg {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #ffd700;
  font-size: 32px;
  font-weight: bold;
  text-shadow: 0 0 20px #ff6b6b;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s;
  z-index: 100;
}

#easter-egg.show {
  opacity: 1;
  animation: pulse 1s ease-in-out infinite;
}

/* 狂暴模式闪烁效果 */
@keyframes fever-flash {
  0%, 100% { filter: brightness(1); }
  50% { filter: brightness(1.5) drop-shadow(0 0 10px #ff0000); }
}

.fever-mode {
  animation: fever-flash 0.3s ease-in-out infinite;
}

/* 核弹爆炸效果 */
.nuke-flash {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(255,255,255,0.9) 0%, rgba(255,200,0,0.5) 30%, transparent 70%);
  opacity: 0;
  pointer-events: none;
  z-index: 150;
  transition: opacity 0.1s ease-out;
}

.nuke-flash.show {
  opacity: 1;
}

@keyframes pulse {
  0%, 100% {
    transform: translate(-50%, -50%) scale(1);
  }
  50% {
    transform: translate(-50%, -50%) scale(1.1);
  }
}

/* 开始/结束画面 */
#overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  z-index: 200;
  pointer-events: auto;
}

#overlay h1 {
  color: #ffd700;
  font-size: 36px;
  margin-bottom: 20px;
  text-shadow: 3px 3px 0 #ff4444;
}

#overlay p {
  font-size: 16px;
  margin: 10px;
  text-align: center;
  line-height: 1.6;
}

.btn {
  margin-top: 30px;
  padding: 15px 40px;
  font-size: 24px;
  background: linear-gradient(145deg, #ff6b6b, #cc5555);
  border: none;
  border-radius: 30px;
  color: #fff;
  cursor: pointer;
  box-shadow: 0 6px 0 #992222;
  transition: all 0.1s;
}

.btn:active {
  transform: translateY(6px);
  box-shadow: 0 0 0 #992222;
}