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

html, body {
  width: 100%;
  min-height: 100%;
}

body {
  font-family: "Hiragino Maru Gothic ProN", "BIZ UDPGothic", "Yu Gothic", "Meiryo", sans-serif;
  background: radial-gradient(ellipse at 50% 30%, #1a1a3e 0%, #0d0d24 55%, #050510 100%);
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  padding: 12px;
  touch-action: manipulation;
  overflow-x: hidden;
}

/* ===== 背景の流れる星（CSSのみ） ===== */
#stars-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,0.8), transparent),
    radial-gradient(1px 1px at 70% 15%, rgba(255,255,255,0.6), transparent),
    radial-gradient(2px 2px at 45% 70%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 85% 55%, rgba(255,255,255,0.7), transparent),
    radial-gradient(1.5px 1.5px at 10% 80%, rgba(200,180,255,0.6), transparent),
    radial-gradient(1px 1px at 60% 90%, rgba(255,200,230,0.5), transparent);
  background-size: 600px 600px;
  animation: starsDrift 90s linear infinite;
}

@keyframes starsDrift {
  from { background-position: 0 0; }
  to   { background-position: -600px 600px; }
}

#game-container {
  width: 100%;
  max-width: 840px;
  position: relative;
}

.screen {
  text-align: center;
  padding: 20px 8px;
  animation: screenIn 0.55s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes screenIn {
  from {
    opacity: 0;
    transform: translateY(26px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.hidden {
  display: none !important;
}

/* ===== ガラスモルフィズム共通 ===== */
.glass-panel {
  background: rgba(255, 255, 255, 0.055);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 26px;
  box-shadow:
    0 10px 40px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.12);
  padding: 30px 22px 34px;
  max-width: 620px;
  margin: 0 auto;
}

.glass-inline {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.glass-bar {
  background: rgba(10, 10, 30, 0.45);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.glass-icon {
  position: absolute;
  top: 6px;
  right: 6px;
  z-index: 10;
  width: 44px;
  height: 44px;
  font-size: 1.15rem;
  background: rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.2s;
}

.glass-icon:hover {
  transform: scale(1.12) rotate(8deg);
  background: rgba(255, 255, 255, 0.14);
}

/* ===== タイトル画面 ===== */
.title-panel {
  margin-top: 26px;
}

.game-title {
  font-size: clamp(1.6rem, 5vw, 2.6rem);
  line-height: 1.3;
  background: linear-gradient(180deg, #ffd9ec 0%, #ff8fc8 55%, #c86bff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 10px rgba(255, 143, 200, 0.35));
  animation: titleGlow 2.8s ease-in-out infinite alternate;
}

@keyframes titleGlow {
  from { filter: drop-shadow(0 2px 8px rgba(255, 143, 200, 0.25)); }
  to   { filter: drop-shadow(0 2px 18px rgba(200, 107, 255, 0.65)); }
}

.subtitle {
  margin-top: 10px;
  color: #c8c8ea;
  font-size: 0.95rem;
}

.difficulty-select {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin: 26px 0 8px;
}

.difficulty-btn {
  width: 150px;
  padding: 14px 8px;
  font-size: 1.05rem;
  font-family: inherit;
  color: #ccc;
  line-height: 1.4;
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid rgba(255, 255, 255, 0.16);
  border-radius: 16px;
  cursor: pointer;
  transition:
    transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
    border-color 0.25s ease,
    box-shadow 0.25s ease,
    background 0.25s ease;
}

.difficulty-btn:hover {
  transform: translateY(-3px);
}

.difficulty-btn span {
  font-size: 0.75rem;
  letter-spacing: 2px;
  color: #9a9ac4;
}

.difficulty-btn.selected {
  color: #fff;
  border-color: #ff8fc8;
  background: rgba(255, 143, 200, 0.14);
  box-shadow: 0 0 22px rgba(255, 143, 200, 0.4);
  transform: scale(1.07);
}

.difficulty-btn.selected span {
  color: #ffb6dc;
}

.howto {
  margin: 18px auto 6px;
  max-width: 520px;
  font-size: 0.85rem;
  line-height: 1.8;
  color: #b0b0d4;
}

.howto em {
  font-style: normal;
  color: #ff9fb8;
}

.main-btn {
  margin-top: 20px;
  padding: 14px 64px;
  font-size: 1.25rem;
  font-family: inherit;
  font-weight: bold;
  color: #fff;
  background: linear-gradient(180deg, #ff8fc8, #d84fa0);
  border: none;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 4px 0 #a03578, 0 0 26px rgba(255, 143, 200, 0.4);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease;
}

.main-btn:hover {
  transform: translateY(-2px) scale(1.04);
  box-shadow: 0 6px 0 #a03578, 0 0 36px rgba(255, 143, 200, 0.6);
}

.main-btn:active {
  transform: translateY(3px);
  box-shadow: 0 1px 0 #a03578;
}

.sub-btn {
  display: block;
  margin: 16px auto 0;
  padding: 10px 36px;
  font-size: 0.95rem;
  font-family: inherit;
  color: #ccc;
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid rgba(255, 255, 255, 0.16);
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), border-color 0.2s;
}

.sub-btn:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.4);
}

.highscore-box {
  margin: 28px auto 0;
  max-width: 300px;
  padding: 12px 16px;
  font-size: 0.85rem;
  color: #9a9ac4;
  line-height: 1.9;
}

/* ===== プレイ画面 ===== */
#screen-play {
  padding-top: 8px;
}

#canvas-wrap {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

#game-canvas {
  display: block;
  width: 100%;
  height: auto;
  background: radial-gradient(ellipse at 50% 40%, #12122e 0%, #08081a 70%, #030310 100%);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 14px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

#hud {
  position: absolute;
  top: 10px;
  left: 12px;
  width: min(80%, 560px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 8px 20px;
}

/* 狭い画面ではHUDをコンパクトにしてミュートボタンと重ならないようにする */
@media (max-width: 520px) {
  #hud {
    padding: 6px 12px;
    gap: 8px;
  }

  #hud-time {
    display: none;
  }

  #hud-score {
    font-size: 0.9rem;
  }

  #dash-gauge-outer {
    width: 64px;
  }
}

#hud-score {
  font-size: 1.05rem;
  font-weight: bold;
  letter-spacing: 1px;
  color: #ffe27a;
  text-shadow: 0 0 10px rgba(255, 226, 122, 0.55);
  white-space: nowrap;
}

#hud-time {
  font-size: 0.85rem;
  color: #b0b0d4;
  white-space: nowrap;
}

#hud-dash {
  display: flex;
  align-items: center;
  gap: 8px;
}

.dash-label {
  font-size: 0.7rem;
  letter-spacing: 2px;
  color: #8fd8ff;
}

#dash-gauge-outer {
  width: 96px;
  height: 10px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  overflow: hidden;
}

#dash-gauge-inner {
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #4fc8ff, #8fd8ff);
  border-radius: 999px;
  transition: width 0.1s linear;
}

#dash-gauge-inner.ready {
  box-shadow: 0 0 10px rgba(143, 216, 255, 0.9);
  animation: dashPulse 1.1s ease-in-out infinite alternate;
}

@keyframes dashPulse {
  from { filter: brightness(1); }
  to   { filter: brightness(1.5); }
}

/* ===== スマホ用コントロール ===== */
#touch-controls {
  display: none;
  justify-content: space-between;
  align-items: center;
  max-width: 800px;
  margin: 14px auto 0;
  padding: 0 8px;
}

@media (pointer: coarse) {
  #touch-controls {
    display: flex;
  }
}

#dpad {
  display: grid;
  grid-template-columns: 56px 56px 56px;
  grid-template-rows: 56px 56px;
  gap: 4px;
}

#dpad-up    { grid-column: 2; grid-row: 1; }
#dpad-left  { grid-column: 1; grid-row: 2; }
#dpad-right { grid-column: 3; grid-row: 2; }
#dpad-down  { grid-column: 2; grid-row: 2; }

.dpad-btn {
  font-size: 1.1rem;
  color: #ccc;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 12px;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.dpad-btn:active {
  background: rgba(255, 143, 200, 0.2);
  border-color: #ff8fc8;
}

#btn-dash-touch {
  width: 88px;
  height: 88px;
  font-size: 1rem;
  font-weight: bold;
  font-family: inherit;
  color: #08081a;
  background: linear-gradient(180deg, #8fd8ff, #4fc8ff);
  border: none;
  border-radius: 50%;
  box-shadow: 0 0 18px rgba(79, 200, 255, 0.55);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

#btn-dash-touch:active {
  filter: brightness(0.8);
}

/* ===== ゲームオーバー画面 ===== */
.gameover-panel {
  margin-top: 20px;
}

.gameover-title {
  font-size: clamp(2rem, 7vw, 3.2rem);
  letter-spacing: 4px;
  color: #ff6b9a;
  text-shadow: 0 0 28px rgba(255, 107, 154, 0.65);
  animation: titleDrop 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes titleDrop {
  from {
    opacity: 0;
    transform: translateY(-30px) scale(1.25);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.gameover-quote {
  margin-top: 12px;
  font-size: 1rem;
  color: #ffd9ec;
}

#rank-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 22px;
  padding: 10px 26px;
  background: linear-gradient(120deg, rgba(255, 143, 200, 0.18), rgba(200, 107, 255, 0.18));
  border: 1px solid rgba(255, 180, 220, 0.45);
  border-radius: 999px;
  box-shadow: 0 0 24px rgba(255, 143, 200, 0.25);
  animation: badgePop 0.55s cubic-bezier(0.34, 1.56, 0.64, 1) 0.25s both;
}

@keyframes badgePop {
  from {
    opacity: 0;
    transform: scale(0.4);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.rank-label {
  font-size: 0.7rem;
  letter-spacing: 3px;
  color: #ffb6dc;
}

#rank-name {
  font-size: 1.2rem;
  font-weight: bold;
  background: linear-gradient(180deg, #fff0f8, #ffb6dc);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.rank-message {
  margin: 16px auto 0;
  max-width: 460px;
  font-size: 1.02rem;
  line-height: 1.9;
  color: #ffe3f1;
  animation: fadeUp 0.5s ease-out 0.45s both;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-box {
  margin: 24px auto 0;
  max-width: 340px;
  padding: 18px 16px;
  line-height: 1.9;
}

.result-score {
  font-size: 1.5rem;
  font-weight: bold;
  color: #ffe27a;
  text-shadow: 0 0 12px rgba(255, 226, 122, 0.4);
}

.result-detail {
  font-size: 0.9rem;
  color: #b0b0d4;
}

.new-record {
  font-size: 1.05rem;
  font-weight: bold;
  color: #7affc8;
  text-shadow: 0 0 14px rgba(122, 255, 200, 0.7);
  animation: recordBlink 0.8s ease-in-out infinite alternate;
}

@keyframes recordBlink {
  from { opacity: 1; transform: scale(1); }
  to   { opacity: 0.55; transform: scale(1.05); }
}

.result-highscore {
  font-size: 0.9rem;
  color: #9a9ac4;
}