:root {
  --bg: #f4efe6;
  --panel: #ffffff;
  --ink: #3b3630;
  --ink-soft: #8a8078;
  --line: #e3dbcd;
  --accent: #8a9a7b;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-rounded, "Avenir Next", "Nunito", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}

#app {
  max-width: 760px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

header { text-align: center; margin-bottom: 14px; }

header h1 {
  margin: 0;
  font-size: 26px;
  letter-spacing: 0.02em;
  font-weight: 700;
}

header .sub {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--ink-soft);
  letter-spacing: 0.08em;
  text-transform: lowercase;
}

main {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  justify-content: center;
  flex-wrap: wrap;
}

.stage-wrap { position: relative; }

#stage {
  display: block;
  background: var(--panel);
  border-radius: 18px;
  box-shadow: 0 8px 24px rgba(90, 78, 64, 0.10);
  touch-action: none;
  cursor: crosshair;
  max-width: 100%;
  height: auto;
}

#gameover {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(244, 239, 230, 0.88);
  border-radius: 18px;
}

#gameover.hidden, #tuner.hidden { display: none; }

#gameover .panel { text-align: center; }

#gameover h2 {
  margin: 0 0 6px;
  font-size: 20px;
}

#gameover .final {
  margin: 0 0 14px;
  color: var(--ink-soft);
  font-size: 14px;
}

button {
  font: inherit;
  font-size: 14px;
  padding: 8px 16px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  cursor: pointer;
}

button:hover { border-color: var(--accent); }

aside {
  width: 190px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.score-box {
  background: var(--panel);
  border-radius: 14px;
  padding: 12px 14px;
  box-shadow: 0 4px 12px rgba(90, 78, 64, 0.07);
  display: flex;
  flex-direction: column;
  position: relative;
  border-left: 4px solid var(--accent);
}

.score-box.small { padding: 8px 14px; }

.score-box .label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.score-box .value {
  font-size: 26px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.score-box.small .value { font-size: 17px; }

.chain {
  background: var(--panel);
  border-radius: 14px;
  padding: 10px;
  box-shadow: 0 4px 12px rgba(90, 78, 64, 0.07);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}

.chain .chain-item {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.30;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.chain .chain-item.reached {
  opacity: 1;
  transform: scale(1.10);
}

.chain .chain-item canvas { display: block; }

.controls { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 8px; }

.controls button {
  padding: 6px 4px;
  font-size: 12px;
}

.go-actions { display: flex; gap: 8px; justify-content: center; }

button.ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink-soft);
}

button.active {
  border-color: var(--accent);
  background: #f6f9f3;
  color: #4f5d42;
}

#leaderboard {
  background: var(--panel);
  border-radius: 14px;
  padding: 12px;
  box-shadow: 0 4px 12px rgba(90, 78, 64, 0.07);
  font-size: 12px;
}

#leaderboard h3 {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.02em;
}

#leaderboard .lb-section {
  display: flex;
  flex-direction: column;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

#leaderboard .lb-section .label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

#leaderboard .lb-section .value {
  font-size: 16px;
  font-weight: 700;
}

#rank-list {
  margin: 0;
  padding-left: 18px;
}

#rank-list li {
  margin-bottom: 4px;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#rank-list .num { color: var(--ink-soft); margin-right: 4px; }
#rank-list small { color: var(--ink-soft); font-size: 10px; }

#tuner {
  background: var(--panel);
  border-radius: 14px;
  padding: 12px;
  box-shadow: 0 4px 12px rgba(90, 78, 64, 0.07);
  font-size: 11px;
}

#tuner .row { margin-bottom: 9px; }

#tuner .row:last-child { margin-bottom: 0; }

#tuner label {
  display: flex;
  justify-content: space-between;
  color: var(--ink-soft);
  margin-bottom: 2px;
}

#tuner label span { font-variant-numeric: tabular-nums; color: var(--ink); }

#tuner input[type=range] { width: 100%; margin: 0; }

#tuner .reset {
  width: 100%;
  margin-top: 10px;
  font-size: 12px;
  padding: 5px;
}

.hint {
  font-size: 12px;
  color: var(--ink-soft);
  text-align: center;
  margin: 0;
}

footer {
  text-align: center;
  font-size: 11px;
  color: var(--ink-soft);
  margin-top: 14px;
}

footer a { color: var(--ink-soft); text-decoration: none; }
footer a:hover { text-decoration: underline; }

@media (max-width: 680px) {
  #app { padding: 12px; }
  header h1 { font-size: 22px; }
  main { gap: 12px; }
  aside { width: 100%; max-width: 420px; }
  .chain { order: 3; }
  .chain .chain-item { width: 34px; height: 34px; }
  .chain .chain-item canvas { width: 34px; height: 34px; }
  .controls { grid-template-columns: 1fr 1fr 1fr; }
}