/* ===== 答题页面 ===== */
.game-page {
  min-height: 100vh;
  background:
    radial-gradient(120% 60% at 50% -10%, #DCEBFF 0%, rgba(220,235,255,0) 55%),
    linear-gradient(180deg, #E8F2FF 0%, #F0F7FF 45%, #EAF3FF 100%);
  display: flex;
  flex-direction: column;
  padding-bottom: 0 !important;
}
.game-top-bar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px 8px;
  background: linear-gradient(180deg, rgba(232,242,255,.92) 0%, rgba(232,242,255,.55) 70%, rgba(232,242,255,0) 100%);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.game-top-bar .icon-btn {
  background: rgba(255,255,255,0.82);
  box-shadow: var(--gc-shadow-sm);
  color: var(--gc-foreground);
  border: 1px solid rgba(79,140,255,0.12);
}
.game-top-center {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 0;
}
.game-subject-chip {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gc-math);
  color: white;
  box-shadow: 0 4px 10px rgba(79,140,255,0.32);
  flex-shrink: 0;
}
.game-chapter-info { line-height: 1.25; }
.game-chapter-title { font-size: 14px; font-weight: 700; }
.game-chapter-sub { font-size: 11px; color: var(--gc-muted-foreground); font-weight: 500; }
.game-progress-text {
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 700;
  color: var(--gc-math);
  background: rgba(255,255,255,0.85);
  padding: 7px 10px;
  border-radius: 999px;
  box-shadow: var(--gc-shadow-sm);
  border: 1px solid rgba(79,140,255,0.14);
}

.game-progress-wrap { padding: 0 14px 10px; }
.game-progress-bar {
  height: 8px;
  border-radius: 999px;
  background: rgba(79,140,255,0.16);
  overflow: hidden;
}
.game-progress-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, #6FA5FF 0%, var(--gc-math) 60%, #3B6FD9 100%);
  box-shadow: 0 0 10px rgba(79,140,255,0.5);
  transition: width 0.5s ease;
  position: relative;
}
.game-progress-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.55), transparent);
  background-size: 200% 100%;
  animation: shimmer 2.2s linear infinite;
}
@keyframes shimmer {
  from { background-position: 200% 0; }
  to { background-position: -200% 0; }
}

.game-status-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 18px 6px;
}
.hearts { display: flex; gap: 5px; align-items: center; }
.heart {
  width: 26px;
  height: 26px;
  color: var(--gc-danger);
  display: flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 2px 4px rgba(239,68,68,0.32));
  transition: all 0.3s;
}
.heart.lost { opacity: 0.3; transform: scale(0.8); }
.heart svg { width: 24px; height: 24px; fill: currentColor; }
.timer-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  width: 60px;
  height: 60px;
}
.timer-ring { transform: rotate(-90deg); width: 60px; height: 60px; }
.timer-ring .track { fill: none; stroke: rgba(79,140,255,0.16); stroke-width: 5; }
.timer-ring .fill {
  fill: none;
  stroke: var(--gc-math);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-dasharray: 113.1;
  transition: stroke-dashoffset 0.6s ease, stroke 0.3s ease;
}
.timer-label {
  position: absolute;
  font-size: 15px;
  font-weight: 800;
  color: var(--gc-math);
}
.timer-label small { font-size: 9px; font-weight: 700; }
.points-pill {
  font-size: 13px;
  font-weight: 800;
  color: var(--gc-warning);
  background: rgba(245,158,11,0.12);
  border: 1px solid rgba(245,158,11,0.28);
  padding: 6px 11px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  gap: 3px;
}

.game-play-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
  padding: 6px 14px 110px;
}

.question-card {
  background: var(--gc-card);
  border-radius: var(--gc-radius-lg);
  box-shadow: var(--gc-shadow-md);
  padding: 16px;
  border: 1px solid rgba(79,140,255,0.08);
}
.diff-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 800;
  color: white;
  background: linear-gradient(135deg, #A78BFA, #8B5CF6);
  padding: 4px 11px;
  border-radius: 999px;
  box-shadow: 0 3px 8px rgba(139,92,246,0.32);
  margin-bottom: 10px;
}
.question-row { display: flex; align-items: flex-start; gap: 12px; }
.question-text {
  flex: 1;
  font-size: 19px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--gc-foreground);
}
.voice-btn-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}
.voice-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gc-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 14px rgba(79,140,255,0.42);
  position: relative;
  border: none;
  cursor: pointer;
}
.voice-btn::after {
  content: '';
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  border: 2px solid rgba(79,140,255,0.35);
  animation: voice-pulse 1.8s ease-out infinite;
}
@keyframes voice-pulse {
  0% { transform: scale(0.9); opacity: 0.7; }
  100% { transform: scale(1.5); opacity: 0; }
}
.voice-btn svg { width: 22px; height: 22px; }
.voice-label { font-size: 11px; font-weight: 700; color: var(--gc-primary); }

.option-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.option-card {
  min-height: 62px;
  border-radius: var(--gc-radius-md);
  background: var(--gc-card);
  border: 1.5px solid var(--gc-border);
  box-shadow: var(--gc-shadow-sm);
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 10px 14px;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}
.option-card:active { transform: scale(0.97); }
.option-card .letter {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
  color: white;
  background: linear-gradient(135deg, #7BA8FF, #4F8CFF);
  box-shadow: 0 3px 8px rgba(79,140,255,0.32);
  flex-shrink: 0;
}
.option-card .answer {
  flex: 1;
  font-size: 22px;
  font-weight: 800;
  color: var(--gc-foreground);
  text-align: center;
}
.option-card.correct {
  border-color: rgba(34,197,94,0.55);
  background: linear-gradient(180deg, #F0FDF4, #FFFFFF);
  box-shadow: 0 4px 14px rgba(34,197,94,0.18);
}
.option-card.correct .letter {
  background: linear-gradient(135deg, #4ADE80, #22C55E);
  box-shadow: 0 3px 8px rgba(34,197,94,0.36);
}
.option-card.correct::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: linear-gradient(180deg, var(--gc-success), #16A34A);
}
.option-card.correct::after {
  content: '';
  position: absolute;
  top: 8px;
  right: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--gc-success);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-size: 11px;
  background-repeat: no-repeat;
  background-position: center;
}
.option-card.wrong {
  border-color: rgba(239,68,68,0.55);
  background: linear-gradient(180deg, #FEF2F2, #FFFFFF);
  opacity: 0.7;
}
.option-card.wrong .letter {
  background: linear-gradient(135deg, #F87171, #EF4444);
}

.game-bottom-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 40;
  display: flex;
  gap: 12px;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom));
  background: linear-gradient(180deg, rgba(240,247,255,0) 0%, rgba(240,247,255,.92) 30%, #EAF3FF 100%);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  max-width: var(--gc-container-width);
  margin: 0 auto;
}
.game-action-btn {
  flex: 1;
  height: 52px;
  border-radius: var(--gc-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  font-size: 16px;
  font-weight: 800;
  box-shadow: var(--gc-shadow-sm);
  cursor: pointer;
  border: none;
  transition: transform 0.12s;
}
.game-action-btn:active { transform: scale(0.97); }
.game-action-btn svg { width: 20px; height: 20px; }
.btn-hint {
  background: #FFF6E6;
  color: var(--gc-warning);
  border: 1.5px solid rgba(245,158,11,0.4);
}
.btn-skip {
  background: var(--gc-card);
  color: var(--gc-primary);
  border: 1.5px solid rgba(79,140,255,0.35);
}

/* ===== 响应式：平板竖屏（>=768px） ===== */
@media (min-width: 768px) {
  /* 答题页底部操作按钮加高，便于触控 */
  .game-action-btn { height: 58px; }
}