* {
  box-sizing: border-box;
}

:root {
  --soil: #3d6b28;
  --soil-deep: #2a4a1c;
  --sky: #7ec8e8;
  --ink: #1a2e12;
  --panel: rgba(18, 32, 12, 0.92);
  --sun: #f5d547;
  --leaf: #5cb85c;
  --danger: #c44a3a;
  --muted: #a8c49a;
  --line: rgba(255, 255, 255, 0.12);
}

html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(ellipse 70% 45% at 50% 0%, #5a9a3a 0%, transparent 55%),
    linear-gradient(180deg, #1e3a14 0%, #0f1c0a 100%);
  color: #e8f5e0;
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", sans-serif;
}

#wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 0.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
}

.top {
  text-align: center;
}

.top h1 {
  margin: 0;
  font-family: "ZCOOL KuaiLe", "Noto Sans SC", sans-serif;
  font-size: clamp(1.45rem, 4vw, 2rem);
  font-weight: 400;
  letter-spacing: 0.04em;
  color: #f0ffe8;
  text-shadow: 0 2px 0 #1a3a10, 0 0 24px rgba(92, 184, 92, 0.35);
}

.subtitle {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

#stage {
  width: 100%;
  display: flex;
  justify-content: center;
}

.canvas-wrap {
  position: relative;
  width: min(100%, 900px);
  aspect-ratio: 900 / 600;
  border-radius: 8px;
  overflow: hidden;
  box-shadow:
    0 0 0 3px #2d5018,
    0 12px 40px rgba(0, 0, 0, 0.45);
  background: #2d5a1e;
  touch-action: none;
}

#game {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8, 16, 6, 0.72);
  backdrop-filter: blur(4px);
  z-index: 5;
}

.overlay[hidden],
.panel[hidden] {
  display: none !important;
}

.panel {
  width: min(92%, 420px);
  padding: 1.5rem 1.35rem 1.35rem;
  background: var(--panel);
  border: 2px solid rgba(120, 180, 80, 0.45);
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

.panel h2 {
  margin: 0 0 0.65rem;
  font-family: "ZCOOL KuaiLe", sans-serif;
  font-size: 1.55rem;
  font-weight: 400;
  color: var(--sun);
}

.panel-desc {
  margin: 0 0 1.1rem;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--muted);
  text-align: left;
}

.controls-help {
  margin-top: 1rem;
  text-align: left;
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--muted);
}

.controls-help p {
  margin: 0.25rem 0;
}

.btn {
  display: inline-block;
  margin: 0.3rem 0.25rem;
  padding: 0.65rem 1.35rem;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.12s, filter 0.12s;
}

.btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.08);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: linear-gradient(180deg, #7bc84a, #4a9a28);
  color: #102008;
  box-shadow: 0 3px 0 #2d6018;
}

.btn-secondary {
  background: linear-gradient(180deg, #f0d060, #d4a820);
  color: #2a2008;
  box-shadow: 0 3px 0 #8a7010;
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
  box-shadow: none;
}

.end-score {
  margin: 0.5rem 0 1rem;
  font-size: 1.1rem;
  color: var(--sun);
  font-weight: 700;
}

.toast {
  position: absolute;
  top: 28%;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.55rem 1.25rem;
  background: rgba(12, 20, 8, 0.88);
  border: 2px solid var(--sun);
  border-radius: 8px;
  color: var(--sun);
  font-family: "ZCOOL KuaiLe", sans-serif;
  font-size: 1.15rem;
  z-index: 6;
  pointer-events: none;
  animation: toast-in 0.25s ease-out;
}

.toast[hidden] {
  display: none !important;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateX(-50%) translateY(-8px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

.hint {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}

.hint a {
  color: #9ed86a;
  text-decoration: none;
}

.hint a:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  .kb-only { display: none; }
  .panel { padding: 1.15rem 1rem; }
  .top h1 { font-size: 1.3rem; }
}