/* M4 组件样式（节选） */
.progress-ring {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.progress-ring__label {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  fill: #111827;
}

.combo-indicator {
  position: fixed;
  left: 50%;
  top: 42%;
  transform: translate(-50%, -50%);
  z-index: 9000;
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 1.75rem;
  font-weight: 800;
  color: #ea580c;
  text-shadow: 0 2px 12px rgba(234, 88, 12, 0.35);
  pointer-events: none;
}

.combo-indicator--hot {
  color: #dc2626;
  font-size: 2rem;
  text-shadow:
    0 0 20px rgba(220, 38, 38, 0.45),
    0 2px 12px rgba(220, 38, 38, 0.35);
}

.combo-indicator--pulse {
  animation: combo-pulse-m4 0.38s ease;
}

@keyframes combo-pulse-m4 {
  0% {
    transform: translate(-50%, -50%) scale(1);
  }
  45% {
    transform: translate(-50%, -50%) scale(1.18);
  }
  100% {
    transform: translate(-50%, -50%) scale(1);
  }
}

.feedback-toast {
  position: fixed;
  left: 50%;
  bottom: 1.25rem;
  transform: translateX(-50%) translateY(120%);
  z-index: 9500;
  min-width: min(22rem, calc(100vw - 2rem));
  max-width: calc(100vw - 2rem);
  padding: 0.9rem 1.1rem;
  border-radius: 0.75rem;
  font-family: ui-sans-serif, system-ui, sans-serif;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  opacity: 0;
  transition:
    transform 0.32s cubic-bezier(0.34, 1.2, 0.64, 1),
    opacity 0.28s ease;
}

.feedback-toast--visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.feedback-toast--leaving {
  transform: translateX(-50%) translateY(80%);
  opacity: 0;
}

.feedback-toast--ok {
  background: linear-gradient(135deg, #059669, #10b981);
  color: #fff;
}

.feedback-toast--bad {
  background: linear-gradient(135deg, #dc2626, #ef4444);
  color: #fff;
}

.feedback-toast__row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.feedback-toast__mark {
  font-weight: 800;
  font-size: 1.1rem;
}

.feedback-toast__msg {
  font-weight: 600;
  font-size: 0.95rem;
}

.feedback-toast__explain {
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.35);
  font-size: 0.85rem;
  line-height: 1.45;
  opacity: 0.95;
}

.level-display {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: 0.75rem;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  font-family: ui-sans-serif, system-ui, sans-serif;
}

.level-display__badge {
  flex-shrink: 0;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 9999px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  color: #fff;
}

.level-display__main {
  flex: 1;
  min-width: 0;
}

.level-display__name {
  font-weight: 700;
  font-size: 1rem;
  color: #111827;
  margin-bottom: 0.4rem;
}

.level-display__progress-bar {
  height: 0.5rem;
  border-radius: 9999px;
  background: #e5e7eb;
  overflow: hidden;
}

.level-display__progress-fill {
  height: 100%;
  width: 0%;
  border-radius: 9999px;
  transition: width 0.45s ease;
}

.level-display__progress-hint {
  margin-top: 0.35rem;
  font-size: 0.75rem;
  color: #6b7280;
}

.level-display--levelup {
  animation: level-pop-m4 0.65s ease;
}

@keyframes level-pop-m4 {
  0%,
  100% {
    transform: scale(1);
    box-shadow: 0 0 0 0 transparent;
  }
  35% {
    transform: scale(1.03);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.35);
  }
}