:root {
  color-scheme: dark;
  --ink: #f4f8ff;
  --muted: #c3d3ea;
  --panel-edge: rgba(190, 220, 255, 0.34);
  --accent: #ffd98a;
  --accent-strong: #ffc05c;
  --sky: #13294b;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--sky);
}

body {
  min-width: 320px;
  min-height: 100dvh;
  margin: 0;
  color: var(--ink);
  font-family: ui-rounded, "Hiragino Maru Gothic ProN", "Yu Gothic", system-ui, sans-serif;
  background:
    radial-gradient(circle at 20% -10%, rgba(255, 214, 150, 0.28), transparent 32rem),
    radial-gradient(circle at 100% 100%, rgba(120, 200, 255, 0.2), transparent 30rem),
    linear-gradient(170deg, #22457a 0%, #152d55 55%, #0f213f 100%);
}

button,
canvas {
  -webkit-tap-highlight-color: transparent;
}

.game-shell {
  width: min(100%, 760px);
  min-height: 100dvh;
  margin: 0 auto;
  padding: max(18px, env(safe-area-inset-top)) max(14px, env(safe-area-inset-right))
    max(18px, env(safe-area-inset-bottom)) max(14px, env(safe-area-inset-left));
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.masthead {
  text-align: center;
}

.eyebrow {
  margin: 0 0 4px;
  color: #9fc4ef;
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.18em;
}

h1 {
  margin: 0;
  color: #fff6dc;
  font-size: clamp(1.6rem, 7vw, 2.1rem);
  line-height: 1.18;
  letter-spacing: 0.08em;
  text-shadow: 0 0 20px rgba(255, 217, 138, 0.3);
}

.lede {
  margin: 7px auto 0;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.5;
}

.game-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--panel-edge);
  border-radius: 22px;
  background: linear-gradient(155deg, rgba(40, 78, 128, 0.86), rgba(15, 32, 62, 0.92));
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.score-item {
  min-height: 46px;
  padding: 6px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  border: 1px solid rgba(190, 220, 255, 0.2);
  border-radius: 13px;
  background: rgba(8, 20, 42, 0.45);
}

.score-item span {
  color: #b8cbe6;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.score-item strong {
  color: #ffffff;
  font-size: 1.1rem;
  font-variant-numeric: tabular-nums;
}

.score-item--feather strong {
  color: var(--accent);
}

.stage-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(225, 240, 255, 0.42);
  border-radius: 16px;
  background: #6fa6dc;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: pointer;
  /* 押し続ける操作なので、スクロール・ズーム・長押しメニュー・文字選択を起こさない */
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.game-status {
  min-height: 2.6em;
  margin: 0;
  color: #e6efff;
  font-size: 0.86rem;
  line-height: 1.45;
  text-align: center;
}

.actions {
  display: flex;
  justify-content: center;
}

.primary-button {
  min-width: 190px;
  min-height: 46px;
  padding: 10px 22px;
  border: 0;
  border-radius: 999px;
  color: #3a2508;
  font: 800 0.95rem ui-rounded, "Hiragino Maru Gothic ProN", "Yu Gothic", system-ui, sans-serif;
  letter-spacing: 0.06em;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: 0 6px 16px rgba(255, 190, 92, 0.3);
  cursor: pointer;
}

.primary-button:focus-visible,
canvas:focus-visible {
  outline: 3px solid #bfe3ff;
  outline-offset: 3px;
}

.controls-help {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
}

.controls-help p {
  margin: 0;
}

.controls-help b {
  color: #fff3d0;
}

.tap-mark {
  color: #dcecff;
  font-size: 1rem;
}

footer {
  margin-top: auto;
  color: #8fa6c6;
  font-size: 0.68rem;
  text-align: center;
}

/* 縦持ちの狭い画面では枠を4:3にし、表示範囲を絞って島と主人公を大きく見せる（game.js が枠の比率から表示幅を決める） */
@media (max-width: 560px) {
  .stage-frame {
    aspect-ratio: 4 / 3;
  }
}

@media (max-width: 420px) {
  .game-card {
    padding: 9px;
  }

  .score-item {
    padding: 5px 8px;
  }

  .score-item strong {
    font-size: 0.98rem;
  }
}