:root {
  --ease: cubic-bezier(.22, 1, .36, 1);
  --accent: #7a7cff;
  --ink: #eef1ff;
  --dim: #8a90b8;
  --panel: rgba(14, 16, 40, .72);
  --line: rgba(160, 170, 255, .2);
  --mono: 'Orbitron', 'Segoe UI', sans-serif;
}

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

html, body {
  height: 100%;
  background: #020309;
  overflow: hidden;
  color: var(--ink);
  font-family: 'Zen Kaku Gothic New', 'Hiragino Sans', 'Yu Gothic', 'Meiryo', sans-serif;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
}

#stage {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 540px;
  height: 720px;
  transform: translate(-50%, -50%) scale(var(--s, 1));
  overflow: hidden;
  border-radius: 8px;
  background: #04050d;
  box-shadow: 0 0 0 1px rgba(120, 130, 255, .14), 0 30px 120px rgba(40, 50, 160, .35);
}

canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

.vignette {
  position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse at center, transparent 55%, rgba(0, 0, 0, .55) 100%);
}

/* ---------- 画面遷移（全画面共通） ---------- */
.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: scale(1.06);
  filter: blur(10px);
  transition:
    opacity .6s var(--ease),
    transform .7s var(--ease),
    filter .6s var(--ease),
    visibility 0s linear .7s;
}
.screen.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: none;
  filter: none;
  transition:
    opacity .6s var(--ease),
    transform .7s var(--ease),
    filter .6s var(--ease),
    visibility 0s linear 0s;
}

/* 子要素の時間差フェードイン */
.st {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .5s var(--ease), transform .6s var(--ease);
}
.screen.active .st {
  opacity: 1;
  transform: none;
  transition-delay: calc(var(--d, 0) * 70ms + 140ms);
}

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .45em;
  color: var(--accent);
  transition: color .6s var(--ease);
}
h2 { font-size: 30px; font-weight: 900; letter-spacing: .08em; margin-top: 6px; }

.kbd {
  display: inline-grid;
  place-items: center;
  min-width: 22px;
  height: 22px;
  padding: 0 5px;
  margin: 0 2px;
  border: 1px solid rgba(200, 205, 255, .35);
  border-bottom-width: 2px;
  border-radius: 5px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink);
  background: rgba(255, 255, 255, .04);
  vertical-align: middle;
}
.kbd.wide { min-width: 44px; }

/* ---------- タイトル ---------- */
#scr-title { cursor: pointer; }
.logo { text-align: center; margin-top: -60px; }
.logo-sub { font-family: var(--mono); letter-spacing: .5em; font-size: 12px; color: var(--dim); }
.logo h1 {
  font-size: 68px;
  font-weight: 900;
  letter-spacing: .06em;
  margin: 10px 0 4px;
  background: linear-gradient(180deg, #ffffff 10%, #c9ceff 55%, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 22px rgba(122, 124, 255, .55));
}
.logo-en { font-family: var(--mono); font-weight: 700; letter-spacing: .42em; font-size: 15px; color: #c9ceff; }

.press { margin-top: 80px; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.press-main {
  font-family: var(--mono);
  font-weight: 700;
  letter-spacing: .35em;
  font-size: 18px;
  animation: pulse 1.8s ease-in-out infinite;
}
.press-sub { font-size: 12px; color: var(--dim); letter-spacing: .1em; }
@keyframes pulse { 0%, 100% { opacity: .35; text-shadow: none; } 50% { opacity: 1; text-shadow: 0 0 16px var(--accent); } }

.howto {
  position: absolute;
  bottom: 38px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--dim);
}
.howto .sep { display: inline-block; width: 14px; }

/* ---------- 難易度選択 ---------- */
.sel-head { text-align: center; }
.diff-list { display: flex; flex-direction: column; gap: 14px; width: 400px; margin-top: 30px; }
.diff {
  --c: #fff;
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  column-gap: 12px;
  row-gap: 4px;
  text-align: left;
  padding: 16px 20px 16px 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: var(--ink);
  font: inherit;
  cursor: pointer;
  overflow: hidden;
  outline: none;
}
.screen.active .diff.st {
  transition:
    opacity .5s var(--ease) calc(var(--d, 0) * 70ms + 140ms),
    transform .45s var(--ease),
    border-color .35s, box-shadow .35s, background .35s;
}
.diff::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: var(--c);
  transform: scaleY(.25);
  transition: transform .4s var(--ease);
}
.diff::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, transparent 30%, rgba(255, 255, 255, .12) 50%, transparent 70%);
  transform: translateX(-100%);
}
.screen.active .diff.sel { transform: translateX(12px); }
.diff.sel {
  border-color: var(--c);
  box-shadow: 0 0 0 1px var(--c) inset, 0 0 34px -8px var(--c);
  background: linear-gradient(90deg, color-mix(in srgb, var(--c) 20%, transparent), var(--panel) 70%);
}
.diff.sel::before { transform: none; }
.diff.sel::after { transform: translateX(100%); transition: transform .8s var(--ease); }
.d-name { font-size: 22px; font-weight: 900; letter-spacing: .06em; }
.d-name em { font-style: normal; font-family: var(--mono); font-size: 11px; letter-spacing: .3em; color: var(--c); margin-left: 8px; vertical-align: middle; }
.d-desc { grid-column: 1; grid-row: 2; font-size: 13px; color: var(--dim); }
.d-mult {
  grid-column: 2; grid-row: 1 / 3;
  align-self: center;
  display: flex; flex-direction: column; align-items: flex-end;
  font-family: var(--mono); font-size: 9px; letter-spacing: .25em; color: var(--dim);
}
.d-mult b { font-size: 24px; letter-spacing: 0; color: var(--c); }

.best-line { margin-top: 24px; font-size: 13px; color: var(--dim); }
.best-line b { font-family: var(--mono); color: var(--ink); margin-left: 8px; }
.hint { margin-top: 18px; font-size: 12px; color: var(--dim); }

/* ---------- HUD ---------- */
#scr-hud {
  justify-content: flex-start;
  align-items: stretch;
  transform: translateY(-18px);
  filter: none;
}
#scr-hud.active { transform: none; pointer-events: none; }
.hud-top { display: flex; justify-content: space-between; padding: 16px 20px 0; }
.hud-block.right { text-align: right; }
.hud-label { font-family: var(--mono); font-size: 10px; letter-spacing: .35em; color: var(--dim); }
.hud-score, .hud-time {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 26px;
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 14px color-mix(in srgb, var(--accent) 70%, transparent);
}
.hud-time { font-size: 22px; }
.hud-sub { display: flex; align-items: center; gap: 16px; padding: 8px 20px 0; font-family: var(--mono); font-size: 11px; letter-spacing: .15em; color: var(--dim); }
.hud-graze b { color: var(--ink); margin-left: 4px; }
.hud-diff { margin-left: auto; color: var(--accent); }
.hud-lives { display: flex; gap: 6px; }
.life {
  width: 12px; height: 12px;
  transform: rotate(45deg);
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  transition: transform .5s var(--ease), opacity .5s var(--ease), background .5s, box-shadow .5s;
}
.life.lost { transform: rotate(225deg) scale(.45); opacity: .35; background: #555a7a; box-shadow: none; }

/* ---------- カウントダウン ---------- */
#count {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
  font-family: var(--mono);
  font-weight: 900;
  font-size: 110px;
  opacity: 0;
  color: #fff;
  text-shadow: 0 0 30px var(--accent);
}
#count.pop { animation: countPop .75s var(--ease) forwards; }
#count.go { font-size: 64px; letter-spacing: .25em; animation: countGo 1.1s var(--ease) forwards; }
@keyframes countPop {
  0% { opacity: 0; transform: scale(2.2); filter: blur(12px); }
  30% { opacity: 1; transform: scale(1); filter: none; }
  70% { opacity: 1; }
  100% { opacity: 0; transform: scale(.75); }
}
@keyframes countGo {
  0% { opacity: 0; transform: scale(.6); letter-spacing: 0; }
  25% { opacity: 1; transform: scale(1); }
  60% { opacity: 1; }
  100% { opacity: 0; transform: scale(1.5); letter-spacing: .6em; filter: blur(6px); }
}

/* ---------- メニュー/ボタン ---------- */
.menu { display: flex; flex-direction: column; gap: 10px; margin-top: 28px; width: 280px; }
.btn {
  position: relative;
  padding: 13px 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--ink);
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .08em;
  cursor: pointer;
  outline: none;
}
.screen.active .btn.st {
  transition:
    opacity .5s var(--ease) calc(var(--d, 0) * 70ms + 140ms),
    transform .45s var(--ease),
    border-color .3s, box-shadow .3s, background .3s, color .3s;
}
.btn::before {
  content: '▶';
  position: absolute;
  left: 14px; top: 50%;
  font-size: 10px;
  color: var(--accent);
  opacity: 0;
  transform: translate(-8px, -50%);
  transition: opacity .3s var(--ease), transform .3s var(--ease);
}
.btn.sel {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 18%, rgba(14, 16, 40, .8));
  box-shadow: 0 0 26px -8px var(--accent);
}
.screen.active .btn.sel { transform: scale(1.03); }
.btn.sel::before { opacity: 1; transform: translate(0, -50%); }
.btn .kbd { margin-left: 6px; }

#scr-pause { background: rgba(4, 5, 16, .55); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); transform: scale(1.03); }
#scr-pause.active { transform: none; }

/* ---------- リザルト ---------- */
#scr-result { transform: translateY(40px) scale(.97); }
#scr-result.active { transform: none; }
.panel {
  position: relative;
  width: 440px;
  padding: 26px 28px 24px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(20, 22, 54, .82), rgba(10, 11, 28, .86));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 30px 80px rgba(0, 0, 0, .5), 0 0 60px -30px var(--accent);
}
.res-head h2 { margin-top: 4px; }
.res-diff {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 12px;
  border: 1px solid var(--accent);
  border-radius: 99px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--accent);
}
.res-rows { margin-top: 18px; display: flex; flex-direction: column; }
.res-rows .row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 9px 0;
  border-bottom: 1px dashed rgba(160, 170, 255, .14);
  font-size: 14px;
  color: var(--dim);
}
.res-rows .row b { font-family: var(--mono); font-size: 17px; color: var(--ink); font-variant-numeric: tabular-nums; }
.res-score { margin-top: 18px; display: flex; flex-direction: column; align-items: flex-start; }
.res-score span { font-family: var(--mono); font-size: 11px; letter-spacing: .35em; color: var(--dim); }
.res-score b {
  font-family: var(--mono);
  font-size: 44px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 24px var(--accent);
}
.res-score em {
  font-style: normal;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .25em;
  color: #ffd25d;
  opacity: 0;
  transform: translateX(-10px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
.res-score em.show { opacity: 1; transform: none; animation: shine 1.4s ease-in-out infinite .5s; }
@keyframes shine { 50% { text-shadow: 0 0 14px #ffd25d; } }
.res-best { margin-top: 6px; font-size: 12px; color: var(--dim); }
.res-best b { font-family: var(--mono); color: var(--ink); margin-left: 6px; }

.res-rank {
  position: absolute;
  right: 26px;
  top: 22px;
  width: 96px;
  height: 96px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--accent);
  border-radius: 50%;
  font-family: var(--mono);
  color: var(--accent);
  opacity: 0;
  transform: scale(2.4) rotate(-25deg);
  transition: opacity .25s ease, transform .5s cubic-bezier(.34, 1.56, .64, 1);
}
.res-rank small { font-size: 9px; letter-spacing: .3em; }
.res-rank span { font-size: 48px; font-weight: 900; line-height: 1; text-shadow: 0 0 18px var(--accent); }
.res-rank.show { opacity: 1; transform: rotate(-12deg); }

.row-menu { flex-direction: row; width: auto; margin-top: 22px; }
.row-menu .btn { flex: 1; padding: 12px 6px; font-size: 13px; }
.row-menu .btn::before { display: none; }

/* ---------- サウンド表示 ---------- */
.sound {
  position: absolute;
  right: 14px;
  bottom: 12px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .25em;
  color: var(--dim);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .4s var(--ease), transform .4s var(--ease);
  pointer-events: none;
}
.sound.show { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .screen, .screen.active, .st, .screen.active .st { transition-duration: .2s !important; transition-delay: 0s !important; }
}