/* ===== MOGUMOGU SNAKE RUN — Flat Design 2.0 ===== */
:root {
  --bg: #f6f3ea;
  --card: #ffffff;
  --ink: #1f2a44;
  --muted: #6b7385;
  --line: #e8e3d6;
  --primary: #3a86ff;
  --primary-d: #2667d6;
  --gold: #ffbe0b;
  --gold-d: #e09a00;
  --red: #ff595e;
  --red-d: #d63c41;
  --green: #8ac926;
  --purple: #7b2cbf;
  --field: #b9e28c;

  --radius: 16px;
  --shadow: 0 2px 0 rgba(31, 42, 68, 0.06), 0 10px 28px rgba(31, 42, 68, 0.08);
  --pixel: "DotGothic16", ui-monospace, monospace;
  --sans: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-tap-highlight-color: transparent;
}

body { overscroll-behavior: none; }

button { font: inherit; color: inherit; border: none; background: none; cursor: pointer; }
.num { font-family: var(--pixel); font-variant-numeric: tabular-nums; }
canvas { image-rendering: pixelated; image-rendering: crisp-edges; }

/* ---------- screens ---------- */
.screen { display: none; }
.screen.is-active { display: flex; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 20px;
  border-radius: 14px;
  font-weight: 800;
  font-size: 16px;
  transition: transform 0.06s ease, box-shadow 0.06s ease, background 0.15s;
  user-select: none;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 0 var(--primary-d);
}
.btn-primary:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--primary-d); }
.btn-big { font-family: var(--pixel); font-size: 26px; letter-spacing: 4px; padding: 14px 20px; }
.btn-ghost { background: #f1ede2; color: var(--ink); box-shadow: 0 3px 0 #ddd6c4; }
.btn-ghost:active { transform: translateY(2px); box-shadow: 0 1px 0 #ddd6c4; }
.btn-small { font-size: 13px; padding: 8px 14px; border-radius: 10px; }
.btn:focus-visible, .tab:focus-visible { outline: 3px solid rgba(58, 134, 255, 0.45); outline-offset: 2px; }

/* ---------- HOME ---------- */
#home {
  min-height: 100dvh;
  justify-content: center;
  padding: max(20px, env(safe-area-inset-top)) 16px max(24px, env(safe-area-inset-bottom));
}
.home-inner {
  width: 100%;
  max-width: 440px;
  display: flex; flex-direction: column; gap: 14px;
}

.logo { text-align: center; padding: 8px 0 4px; }
.logo canvas { display: block; margin: 0 auto 8px; }
.logo h1 {
  font-family: var(--pixel);
  font-weight: 400;
  font-size: 34px;
  line-height: 1.05;
  letter-spacing: 2px;
  color: var(--ink);
}
.logo-accent { color: var(--red); }
.tagline { margin-top: 8px; font-size: 13px; font-weight: 700; color: var(--muted); }

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}

.play-card { display: flex; flex-direction: column; gap: 12px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field-label { font-size: 12px; font-weight: 700; color: var(--muted); }
.field input {
  font: inherit; font-size: 16px; font-weight: 700;
  padding: 11px 14px;
  border-radius: 12px;
  border: 2px solid var(--line);
  background: #fbfaf6;
  color: var(--ink);
  outline: none;
  transition: border-color 0.15s;
}
.field input:focus { border-color: var(--primary); background: #fff; }
.field input.is-invalid { border-color: var(--red); }
.field-hint { font-size: 12px; color: var(--red); min-height: 0; }
.field-hint:empty { display: none; }

.best-row {
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: 13px; font-weight: 700; color: var(--muted);
}
.best-row strong { font-size: 20px; color: var(--gold-d); font-weight: 400; }

.rules { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.rules li { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.rules .icon { width: 30px; height: 30px; display: grid; place-items: center; flex-shrink: 0; }
.rules-note { margin-top: 10px; font-size: 13px; color: var(--muted); line-height: 1.6; }
.rules-keys { margin-top: 6px; font-size: 12px; color: var(--muted); }
kbd {
  display: inline-block; min-width: 20px; padding: 1px 6px; margin: 0 2px;
  border-radius: 6px; background: #f1ede2; box-shadow: 0 2px 0 #ddd6c4;
  font-family: var(--pixel); font-size: 12px; color: var(--ink); text-align: center;
}

/* ranking */
.ranking-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
.ranking-head h2 { font-family: var(--pixel); font-weight: 400; font-size: 20px; letter-spacing: 2px; }
.tabs { display: flex; background: #f1ede2; padding: 3px; border-radius: 12px; gap: 2px; }
.tab { padding: 6px 12px; border-radius: 9px; font-size: 13px; font-weight: 700; color: var(--muted); }
.tab.is-active { background: #fff; color: var(--ink); box-shadow: 0 1px 0 rgba(31,42,68,0.08), 0 2px 6px rgba(31,42,68,0.08); }

.rank-col { display: none; }
.rank-col.is-active { display: block; }
.rank-col h3 { display: none; }
.rank-list { list-style: none; display: flex; flex-direction: column; gap: 4px; min-height: 60px; }
.rank-list li {
  display: grid; grid-template-columns: 34px 1fr auto; align-items: center; gap: 8px;
  padding: 8px 10px; border-radius: 10px; font-size: 14px;
}
.rank-list li:nth-child(odd) { background: #faf8f2; }
.rank-list li.is-me { background: #e8f1ff; box-shadow: inset 3px 0 0 var(--primary); }
.rank-no { font-family: var(--pixel); color: var(--muted); text-align: center; }
.rank-list li:nth-child(1) .rank-no { color: var(--gold-d); }
.rank-list li:nth-child(2) .rank-no { color: #8e9aaf; }
.rank-list li:nth-child(3) .rank-no { color: #c07a43; }
.rank-name { font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rank-score { font-family: var(--pixel); }
.rank-empty, .rank-loading { padding: 18px 0; text-align: center; font-size: 13px; color: var(--muted); background: none !important; display: block !important; }
.ranking-note { margin-top: 10px; font-size: 11px; color: var(--muted); line-height: 1.5; }

.home-foot { display: flex; justify-content: center; }

/* PC: ランキング3列を横並び */
@media (min-width: 900px) {
  .home-inner { max-width: 880px; display: grid; grid-template-columns: 1fr 1fr; align-items: start; }
  .logo { grid-column: 1 / -1; }
  .ranking-card { grid-column: 1 / -1; }
  .home-foot { grid-column: 1 / -1; }
  .tabs { display: none; }
  .rank-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
  .rank-col { display: block; }
  .rank-col h3 { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
}

/* ---------- GAME ---------- */
#gameScreen {
  height: 100dvh;
  flex-direction: column;
  align-items: center;
  padding: max(8px, env(safe-area-inset-top)) 10px max(10px, env(safe-area-inset-bottom));
  gap: 8px;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.hud {
  width: 100%;
  max-width: 440px;
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr auto;
  gap: 6px;
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 8px 8px 8px 14px;
  align-items: center;
}
.hud-item { display: flex; flex-direction: column; line-height: 1.1; }
.hud-label { font-size: 10px; font-weight: 800; color: var(--muted); letter-spacing: 1px; }
.hud-value { font-size: 20px; }
.hud-value.score { color: var(--gold-d); }
.hud-value.level { color: var(--primary); }
.hud-value.level.flash { animation: lvflash 0.7s ease-out; }
@keyframes lvflash {
  0% { transform: scale(1); color: var(--gold-d); }
  40% { transform: scale(1.35); color: var(--gold-d); }
  100% { transform: scale(1); }
}
.hud-pause {
  width: 40px; height: 40px; border-radius: 12px;
  background: #f1ede2; box-shadow: 0 3px 0 #ddd6c4;
  font-size: 13px; letter-spacing: -2px;
}
.hud-pause:active { transform: translateY(2px); box-shadow: 0 1px 0 #ddd6c4; }

.stage {
  flex: 1;
  min-height: 0;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.canvas-frame {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 0 0 4px #fff, var(--shadow);
  background: var(--field);
  line-height: 0;
}
#gameCanvas { display: block; }

.overlay {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(31, 42, 68, 0.35);
  padding: 16px;
  line-height: normal;
}
.overlay[hidden] { display: none; }
.overlay-card {
  width: 100%; max-width: 280px;
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(31, 42, 68, 0.25);
  padding: 20px 18px;
  display: flex; flex-direction: column; gap: 10px;
  text-align: center;
  animation: pop 0.22s ease-out;
}
@keyframes pop { from { transform: scale(0.92); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.overlay-card h2 { font-family: var(--pixel); font-weight: 400; font-size: 26px; letter-spacing: 2px; }
.result-title { color: var(--red); }
.result-reason { font-size: 13px; color: var(--muted); margin-top: -4px; }
.result-score { font-size: 42px; color: var(--gold-d); line-height: 1.1; }
.new-record {
  align-self: center;
  font-family: var(--pixel);
  font-size: 14px;
  background: var(--gold); color: var(--ink);
  padding: 3px 10px; border-radius: 8px;
  animation: blink 0.6s steps(2) infinite;
}
.new-record[hidden] { display: none; }
@keyframes blink { 50% { opacity: 0.55; } }
.result-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin: 2px 0 4px; }
.result-stats div { background: #faf8f2; border-radius: 10px; padding: 6px 2px; }
.result-stats dt { font-size: 10px; color: var(--muted); font-weight: 700; }
.result-stats dd { font-size: 15px; }
.share-row { display: flex; gap: 8px; }
.share-row .btn { flex: 1; text-decoration: none; }
.share-row[hidden], .share-row .btn[hidden] { display: none; }
.btn-x { background: #0f1419; color: #fff; box-shadow: 0 3px 0 #000; }
.btn-x:active { transform: translateY(2px); box-shadow: 0 1px 0 #000; }
.submit-status { font-size: 11px; color: var(--muted); min-height: 1em; }
.key-hint { font-family: var(--pixel); font-size: 11px; opacity: 0.75; font-weight: 400; }

/* スマホ用 ◀ ▶ パッド */
.pad {
  width: 100%;
  max-width: 440px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  flex-shrink: 0;
}
.pad-btn {
  height: clamp(72px, 13dvh, 108px);
  border-radius: 20px;
  background: var(--card);
  box-shadow: 0 6px 0 #ddd6c4, var(--shadow);
  font-size: 30px;
  color: var(--primary);
  touch-action: none;
  transition: transform 0.05s, box-shadow 0.05s, background 0.1s;
}
.pad-btn.is-pressed {
  transform: translateY(5px);
  box-shadow: 0 1px 0 #ddd6c4;
  background: #e8f1ff;
}

/* 入力デバイスで表示を切り替え */
.only-coarse { display: none; }
@media (hover: none) and (pointer: coarse) {
  .only-coarse { display: grid; }
  p.only-coarse { display: block; }
  .only-fine { display: none !important; }
}
body.is-touch .only-coarse { display: grid; }
body.is-touch p.only-coarse { display: block; }
body.is-touch .only-fine { display: none !important; }