* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  color: #1d1d1f;
  background: #fff;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

button {
  font: inherit;
  color: inherit;
}

.app {
  width: min(520px, 100%);
  padding: 28px 16px 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.topbar {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
}

.title {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 4px;
}

.lead {
  margin: 6px 0 0;
  font-size: 13px;
  color: #8a8f98;
}

.restart {
  padding: 7px 14px;
  border: 1px solid #d7e3f2;
  border-radius: 999px;
  background: #fff;
  color: #1a3a5c;
  cursor: pointer;
}

.restart:hover {
  background: #f3f8fd;
}

.levels {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  padding: 4px;
  background: #f4f7fb;
  border-radius: 12px;
}

.levels button {
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: #7b8794;
  cursor: pointer;
  font-size: 13px;
}

.levels button:hover {
  background: #fff;
}

.levels button.active {
  background: #1a3a5c;
  color: #fff;
  font-weight: 700;
}

.hud {
  width: min(480px, calc(100vw - 32px));
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.hud span {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 12px;
  border: 1px solid #e7eef6;
  border-radius: 12px;
  background: #f8fbfe;
  font-size: 12px;
  color: #8a8f98;
}

.hud span:nth-child(2) {
  align-items: center;
}

.hud span:nth-child(3) {
  align-items: flex-end;
}

.hud strong {
  color: #1a3a5c;
  font-size: 18px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.stage {
  position: relative;
  width: min(480px, calc(100vw - 32px));
}

#canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.8) inset,
    0 22px 40px -24px rgba(16, 42, 74, 0.55);
  touch-action: none;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.overlay.hidden {
  display: none;
}

#overlay-text {
  margin: 0;
  padding: 8px 16px;
  border-radius: 999px;
  background: rgba(8, 20, 36, 0.62);
  color: #f4fbff;
  font-size: 14px;
  font-weight: 600;
  backdrop-filter: blur(6px);
}

.tips {
  margin: 0;
  font-size: 12px;
  color: #8a8f98;
}

@media (max-width: 480px) {
  .title {
    font-size: 24px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
}