:root {
  --bg: #ffffff;
  --panel: #f5f5f5; /* 浅灰 */
  --text: #222222;
  --accent: #ff80ab;
  --ok: #66bb6a;
  --bad: #ff5252;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 1024px;
  margin: 0 auto;
}

#hud {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  align-items: center;
  padding: 8px 12px;
  background: var(--panel);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  position: relative;
}

#mute-btn {
  height: 26px;
  line-height: 26px;
  padding: 0 8px;
  border-radius: 7px;
  font-size: 12px;
}
.hud-item { opacity: 0.95; text-align: center; }
.hud-item span:first-child { opacity: 0.7; margin-right: 6px; }
.hud-item .value { display: inline-block; min-width: 100px; text-align: center; font-weight: 800; color: #1b5e20; }

/* HUD 容错红心样式移除，恢复数字显示 */
#hud-lives { min-height: 20px; }

#stage-wrapper {
  position: relative;
  /* 为了适配浏览器工具栏，减少舞台高度占比 */
  flex: 0 0 58vh;
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
}

#gameCanvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #ffffff;
  border: 1px solid rgba(255,255,255,0.06);
}

/* 大屏（16:10，如 1920x1200）下提升字号与触控目标 */
@media (min-width: 1400px) and (min-height: 900px) {
  .question-big { font-size: clamp(96px, 12vw, 180px); }
  #fire-button.fire { width: 112px; height: 112px; font-size: 38px; }
  .key { font-size: 24px; padding: 18px 0; }
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(7, 8, 16, 0.6);
  backdrop-filter: blur(2px);
}
.overlay.hidden { display: none; }
.overlay-panel {
  width: min(92%, 640px);
  background: var(--panel);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: 20px 18px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.35);
}
.title { margin: 6px 0 14px; text-align: center; letter-spacing: 2px; }

.menu-center { display: grid; place-items: center; }
.result-actions { display: flex; justify-content: center; gap: 10px; margin-top: 12px; }

/* 结果弹窗文本样式：大字体、加粗、深红、居中 */
#result-text {
  text-align: center;
  font-size: 24px;
  font-weight: 800;
  color: #b71c1c;
  margin: 8px 0 4px;
}

.btn {
  appearance: none;
  border: 0;
  border-radius: 10px;
  padding: 12px 16px;
  background: #ffe082;
  color: #3a2f16;
  font-size: 16px;
  cursor: pointer;
}
.btn:hover { background: #ffd54f; }
.btn.primary { background: #42a5f5; color: #ffffff; }
.btn.primary:hover { background: #1e88e5; }

.level-select { margin-top: 12px; }
.level-title { opacity: 0.8; margin-bottom: 8px; }
.level-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }
.level-grid .level { padding: 10px 0; }

#input-panel {
  background: var(--panel);
  border-top: 1px solid rgba(0,0,0,0.06);
  padding: 8px 12px 12px;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "question fire"
    "keypad keypad"
    "backspace backspace";
  gap: 10px 12px;
  align-items: center;
}

#question-display {
  grid-area: question;
  margin: 0;
  height: clamp(100px, 15vw, 170px);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.question-big {
  font-size: clamp(80px, 14vw, 144px);
  margin: 0;
  letter-spacing: 1.5px;
  font-weight: 800;
  color: #222222;
  text-shadow: 0 2px 0 rgba(255,255,255,0), 0 4px 12px rgba(0,0,0,0.06);
}

#q-left { justify-self: end; padding-right: 12px; }
#q-eq { justify-self: center; padding: 0 8px; opacity: 0.85; }
#q-right { justify-self: start; padding-left: 12px; min-width: 2em; text-align: left; }

#fire-button.fire {
  grid-area: fire;
  width: 96px;
  height: 96px;
  padding: 0;
  border-radius: 50%;
  display: grid;
  place-items: center;
  margin: 0;
  justify-self: center;
  align-self: center;
  background: #e53935;
  background-image:
    radial-gradient(circle at 30% 30%, rgba(255,255,255,0.25), transparent 45%),
    linear-gradient(to bottom, #ff5252, #d32f2f);
  color: #ffffff;
  font-size: 34px;
  font-weight: 900;
  letter-spacing: 2px;
  box-shadow: 0 10px 20px rgba(211,47,47,0.35), inset 0 -6px 0 rgba(0,0,0,0.2);
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.08s ease, filter 0.08s ease;
  user-select: none;
  touch-action: manipulation;
}

#fire-button.fire:hover { transform: translateY(-2px); }
#fire-button.fire:active {
  transform: translateY(0);
  box-shadow: 0 6px 14px rgba(211,47,47,0.35), inset 0 -2px 0 rgba(0,0,0,0.25);
  filter: saturate(1.08);
}

#keypad.key-grid { grid-area: keypad; display: grid; grid-template-columns: repeat(11, 1fr); gap: 8px; }
.key {
  padding: 16px 0;
  background: linear-gradient(to bottom, #e3f2fd, #bbdefb);
  color: #0d47a1;
  border: 1px solid #90caf9;
  border-radius: 14px;
  font-size: 22px;
  font-weight: 800;
  text-shadow: 0 1px 0 rgba(255,255,255,0.8);
  box-shadow: 0 6px 0 #90caf9, 0 10px 18px rgba(13,71,161,0.15);
  transition: transform 0.08s ease, box-shadow 0.08s ease, filter 0.08s ease;
}
.key:hover { filter: brightness(1.02); }
.key:active {
  transform: translateY(2px);
  box-shadow: 0 3px 0 #90caf9, 0 6px 12px rgba(13,71,161,0.18);
}

#backspace-button.backspace { grid-area: backspace; width: 100%; margin-top: 0; background: #e0e0e0; color: #263238; }
#backspace-button.backspace:hover { background: #d5d5d5; }

@media (min-width: 700px) {
  #input-panel { padding: 12px 18px 18px; }
  .key { font-size: 20px; }
}