* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: #fbf3e6;
  color: #4a3a30;
  font-family: -apple-system, "Hiragino Maru Gothic ProN", "Hiragino Sans", sans-serif;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.app {
  max-width: 480px;
  margin: 0 auto;
  padding: max(12px, env(safe-area-inset-top)) 12px max(12px, env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* 上の帯（戻る・やり直す）の下の部分を、残りの場所の真ん中に置く。
   盤が画面の上に寄って、下半分が空かないようにするため（T04） */
.app { min-height: 100vh; min-height: 100dvh; }
.app > .top + * { margin-top: auto; }
.app > :last-child { margin-bottom: auto; }

.top { display: flex; justify-content: space-between; align-items: center; }
.info { font-size: 15px; }

.btn {
  font: inherit;
  font-size: 15px;
  padding: 8px 16px;
  border: none;
  border-radius: 999px;
  background: #e0884a;
  color: #fff;
}
.btn-sub { background: #b9a08a; }

.cat { width: 100%; height: 100%; display: block; }

/* 盤面 */
.board {
  padding: 10px;
  border-radius: 12px;
  background: #f1e2c8;
  touch-action: none;
}
.grid {
  display: grid;
  position: relative;
  border-radius: 8px;
  overflow: hidden;
}

/* マス。畳のような市松模様 */
.cell {
  aspect-ratio: 1;
  position: relative;
  background: #fffaf2;
  box-shadow: inset 0 0 0 1px #ead8bd;
  transition: background 0.12s;
}
.cell.alt { background: #fdf5e8; }
.cell.visited { background: #f8dcc0; }
.cell.next { background: #fff1d6; box-shadow: inset 0 0 0 2px #f0c48f; }
.cell.start::after {
  content: "";
  position: absolute; inset: 38%;
  border-radius: 50%;
  background: #e0884a;
  opacity: 0.5;
}

/* 通った道の線 */
.trail {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}
.trail polyline {
  fill: none;
  stroke: #e0884a;
  stroke-width: 0.22;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.7;
}

/* 歩いている猫（線より上に出す） */
.walker {
  position: absolute; inset: 8%;
  z-index: 2;
  pointer-events: none;
}
.walker .cat { animation: hop 0.18s; }
@keyframes hop {
  0% { transform: scale(0.8); }
  100% { transform: scale(1); }
}

/* 寝ている猫（通れない） */
.cell.blocked { background: #eadfd2; }
.sleeper { position: absolute; inset: 14%; opacity: 0.75; filter: saturate(0.7); }
.zzz {
  position: absolute; top: 2%; right: 8%;
  font-size: 14px; font-weight: bold; color: #8a6f5a;
}
.zzz small { font-size: 10px; margin-left: 1px; }

/* 猫ベッド */
.bed { position: absolute; inset: 6%; width: 88%; height: 88%; z-index: 1; }
.bed-cell.shake .bed { animation: shake 0.35s; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8%); }
  75% { transform: translateX(8%); }
}
.bed-cell.sleeping .walker { inset: 16% 14% 10%; }

.hint {
  /* 2行ぶんの高さを取っておき、文が変わっても盤が上下に動かないようにする */
  min-height: 42px; line-height: 1.4; margin: 0;
  text-align: center; font-size: 15px; color: #8a6f5a; white-space: pre-line;
  transition: opacity 0.3s, font-size 0.3s;
}
.hint-quiet { font-size: 13px; opacity: 0.75; }
.hint-alert { color: #c0603a; font-weight: bold; }

/* 結果 */
.overlay {
  position: fixed; inset: 0;
  z-index: 10; /* 盤の上の猫・ベッドより上に重ねる */
  background: rgba(60, 40, 30, 0.45);
  display: flex; align-items: center; justify-content: center;
}
.overlay[hidden] { display: none; }
.overlay-card {
  background: #fffaf2;
  padding: 24px 32px;
  border-radius: 16px;
  text-align: center;
}
.overlay-card p { font-size: 22px; margin: 0 0 16px; }
.overlay-card .overlay-turns { font-size: 15px; margin: -8px 0 14px; opacity: 0.8; }
.overlay-buttons { display: flex; gap: 10px; justify-content: center; }
.overlay-stamp { font-size: 15px; margin: 0 0 18px; }
.overlay-paws { display: flex; justify-content: center; gap: 6px; margin-bottom: 6px; }
.overlay-paws .paw { width: 40px; height: 40px; fill: #e5728a; transform: rotate(-12deg); }
.back-link { display: block; margin-top: 8px; font-size: 15px; color: #8a6f5a; text-decoration: none; padding: 8px; }

/* ホーム・遊び方画面（難易度はホーム画面で選ぶ） */
.screen { background: #fbf3e6; }
.screen .overlay-card { background: transparent; width: min(320px, 100%); }
.title-name { font-size: 34px !important; font-weight: bold; margin-bottom: 8px !important; }
.title-name + .menu-buttons { margin-top: 28px; }
.home-modes { margin: 6px 0 0; }
.screen-title { font-size: 24px !important; font-weight: bold; }
.menu-buttons { display: flex; flex-direction: column; gap: 14px; }
.btn-big { font-size: 20px; padding: 14px 0; width: 100%; }
.option-group { margin-bottom: 28px; text-align: left; }
.option-label { font-size: 15px; margin-bottom: 8px; }
.modes { display: flex; gap: 8px; }
.mode-choice {
  flex: 1;
  font: inherit;
  font-size: 15px;
  padding: 12px 2px;
  white-space: nowrap;
  border-radius: 12px;
  border: 3px solid transparent;
  background: #eadfd2;
  color: #6b5a4c;
}
.mode-choice.selected { color: #fff; border-color: #4a3a30; }
.mode-easy.selected { background: #7cb97a; }
.mode-normal.selected { background: #e0884a; }
.mode-hard.selected { background: #c95a5a; }
.howto-card { width: min(400px, 100%) !important; text-align: left; }
.howto-card .screen-title { text-align: center; }
.howto-list { margin: 0 0 16px; padding-left: 1.4em; font-size: 15px; line-height: 1.6; }
.howto-list li { margin-bottom: 8px; }
.howto-tip { font-size: 14px !important; margin: 0 0 10px !important; opacity: 0.85; }
.howto-card .btn-big { margin-top: 12px; }
.mode-choice small { display: block; font-size: 12px; opacity: 0.85; }