* { box-sizing: border-box; }
:root {
  font-family: Inter, "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: #f8fbff;
  background: #0b0d13;
}
html, body {
  margin: 0;
  min-height: 100%;
  background: radial-gradient(circle at top, #1d2433 0%, #0a0c12 60%);
  overscroll-behavior: none;
}
body {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 10px;
}
button { font: inherit; }
.game-shell { width: min(100%, 460px); }
.hud {
  display: grid;
  grid-template-columns: .8fr 1.25fr 1.1fr .9fr;
  gap: 7px;
  margin-bottom: 8px;
}
.hud-box {
  padding: 8px 6px;
  border-radius: 12px;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.08);
  text-align: center;
}
.hud-box span {
  display: block;
  font-size: 9px;
  letter-spacing: .16em;
  color: rgba(255,255,255,.48);
}
.hud-box strong { display: block; margin-top: 2px; font-size: 20px; }
.canvas-wrap {
  position: relative;
  overflow: hidden;
  border-radius: 18px;
  background: #11151c;
  box-shadow: 0 16px 48px rgba(0,0,0,.4);
}
canvas {
  width: 100%;
  height: auto;
  max-height: calc(100vh - 150px);
  display: block;
  touch-action: none;
  background: #10141b;
}
.overlay {
  position: absolute;
  inset: 0;
  display: none;
  place-items: center;
  padding: 22px;
  background: rgba(5,7,11,.76);
  backdrop-filter: blur(5px);
}
.overlay.visible { display: grid; }
.panel {
  width: min(100%, 340px);
  padding: 26px 22px;
  border-radius: 22px;
  border: 1px solid rgba(255,255,255,.11);
  background: linear-gradient(180deg, rgba(255,255,255,.1), rgba(255,255,255,.035)), #111620;
  text-align: center;
  box-shadow: 0 20px 55px rgba(0,0,0,.38);
}
.badge {
  display: inline-block;
  padding: 6px 10px;
  margin-bottom: 12px;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: .16em;
  color: #8df4d0;
  background: rgba(98,232,182,.1);
}
h1, h2 { margin: 0; }
h1 { font-size: clamp(42px, 12vw, 58px); line-height: .95; letter-spacing: -.05em; }
h2 { font-size: 31px; }
.panel p { color: rgba(255,255,255,.68); line-height: 1.7; font-size: 14px; margin: 18px 0; }
.primary-btn {
  width: 100%;
  min-height: 52px;
  border: 0;
  border-radius: 15px;
  color: #fff;
  font-weight: 900;
  letter-spacing: .08em;
  background: linear-gradient(135deg, #34d399, #22c1c3 55%, #4f7cff);
  box-shadow: 0 12px 30px rgba(41,198,177,.22);
  cursor: pointer;
}
.guide { margin-top: 14px; font-size: 11px; color: rgba(255,255,255,.43); }
.upgrade-list { display: grid; gap: 10px; margin-top: 18px; }
.upgrade-card {
  width: 100%;
  text-align: left;
  padding: 14px;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 14px;
  background: rgba(255,255,255,.055);
  color: #fff;
  cursor: pointer;
}
.upgrade-card strong { display: block; font-size: 15px; margin-bottom: 5px; }
.upgrade-card span { color: rgba(255,255,255,.58); font-size: 12px; line-height: 1.5; }
.status-area { padding-top: 8px; }
.bar { height: 7px; overflow: hidden; border-radius: 999px; background: rgba(255,255,255,.08); margin-bottom: 5px; }
.bar-fill { height: 100%; width: 100%; border-radius: inherit; transition: width .12s linear; }
.hp .bar-fill { background: linear-gradient(90deg, #ff4d67, #ff8f5b); }
.xp .bar-fill { width: 0%; background: linear-gradient(90deg, #58e1ff, #6b78ff); }
.status-row { display: flex; justify-content: space-between; color: rgba(255,255,255,.5); font-size: 11px; }
.status-row strong { color: rgba(255,255,255,.8); }
@media (max-width: 420px) {
  body { padding: 5px; }
  .hud { gap: 5px; margin-bottom: 5px; }
  .hud-box { padding: 6px 4px; }
  .hud-box strong { font-size: 17px; }
  .canvas-wrap { border-radius: 14px; }
}

.boss-hud {
  position: absolute; top: 12px; left: 50%; transform: translateX(-50%);
  width: calc(100% - 34px); display: none; z-index: 4; pointer-events: none;
  padding: 9px 12px; border-radius: 13px; background: rgba(35,7,18,.84);
  border: 1px solid rgba(255,92,126,.32); box-shadow: 0 7px 20px rgba(0,0,0,.32);
}
.boss-hud.visible { display: block; }
.boss-label { display:flex; justify-content:space-between; align-items:center; margin-bottom:6px; font-size:10px; }
.boss-label span { color:#ff8ca5; font-weight:900; letter-spacing:.14em; }
.boss-label strong { color:#ffe6eb; font-size:10px; }
.boss-meter { height:9px; overflow:hidden; border-radius:999px; background:rgba(255,255,255,.1); }
.boss-meter-fill { width:100%; height:100%; border-radius:inherit; background:linear-gradient(90deg,#ff355d,#ff8d4b); transition:width .12s linear; }

.audio-toggle {
  position: absolute;
  z-index: 8;
  top: 10px;
  right: 10px;
  min-width: 58px;
  height: 32px;
  padding: 0 10px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 999px;
  color: #fff;
  background: rgba(8,12,24,.72);
  backdrop-filter: blur(5px);
  font-size: 11px;
  font-weight: 900;
  cursor: pointer;
  touch-action: manipulation;
}
.audio-toggle:active { transform: scale(.97); }