* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: #000; display: flex; align-items: center; justify-content: center;
  height: 100vh; overflow: hidden;
  font-family: 'Courier New', monospace; touch-action: none;
}
#gameCanvas { display: block; }
#ui {
  position: absolute; top: 0; left: 0; right: 0;
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: 12px 16px; pointer-events: none;
}
.hud-box {
  background: rgba(0,20,40,0.75); border: 1px solid rgba(0,200,255,0.3);
  border-radius: 4px; padding: 6px 12px; color: #00cfff;
  font-size: 11px; letter-spacing: 2px; text-transform: uppercase;
}
.hud-val { font-size: 20px; font-weight: bold; color: #fff; letter-spacing: 1px; }
.coin-val { font-size: 20px; font-weight: bold; color: #ffd700; letter-spacing: 1px; }
#overlay {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  background: rgba(0,8,20,0.92); color: #fff; text-align: center; padding: 20px;
}
#overlay h1 {
  font-size: clamp(28px,8vw,52px); letter-spacing: 8px; color: #00cfff;
  text-shadow: 0 0 30px #00cfff, 0 0 60px #0088ff;
  margin-bottom: 8px; text-transform: uppercase;
}
.sub-title { font-size: clamp(10px,3vw,14px); color: rgba(0,200,255,0.6); letter-spacing: 4px; margin-bottom: 30px; }
.score-display { font-size: clamp(14px,4vw,22px); color: #aef; margin-bottom: 6px; letter-spacing: 3px; }
.best-display  { font-size: clamp(11px,3vw,15px); color: rgba(150,220,255,0.55); letter-spacing: 3px; margin-bottom: 28px; }
.menu-coins    { font-size: clamp(13px,3.5vw,18px); color: #ffd700; letter-spacing: 3px; margin-bottom: 20px; }
.btn {
  background: transparent; border: 2px solid #00cfff; color: #00cfff;
  font-family: 'Courier New', monospace; font-size: clamp(12px,3.5vw,16px);
  letter-spacing: 4px; padding: 14px 36px; cursor: pointer;
  text-transform: uppercase; transition: all 0.2s; box-shadow: 0 0 20px rgba(0,200,255,0.2);
}
.btn:hover,.btn:active { background: rgba(0,200,255,0.15); box-shadow: 0 0 30px rgba(0,200,255,0.5); }
.btn-gold { border-color: #ffd700; color: #ffd700; box-shadow: 0 0 20px rgba(255,215,0,0.2); margin-top: 10px; }
.btn-gold:hover,.btn-gold:active { background: rgba(255,215,0,0.1); box-shadow: 0 0 30px rgba(255,215,0,0.4); }
.hint { font-size: 11px; color: rgba(150,200,255,0.4); letter-spacing: 2px; margin-top: 16px; }
#thrustBtn {
  position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%);
  width: 90px; height: 90px; border-radius: 50%;
  background: rgba(0,150,255,0.12); border: 2px solid rgba(0,200,255,0.35);
  color: rgba(0,200,255,0.7); font-size: 28px;
  display: flex; align-items: center; justify-content: center;
  user-select: none; -webkit-user-select: none; cursor: pointer;
  transition: background 0.1s, border-color 0.1s; z-index: 10;
}
#thrustBtn.active { background: rgba(0,150,255,0.3); border-color: rgba(0,220,255,0.8); box-shadow: 0 0 20px rgba(0,180,255,0.4); }
#depthArrow {
  position: absolute; right: 16px; top: 50%; transform: translateY(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 6px; pointer-events: none;
}
.arrow-indicator { width:0;height:0;border-left:8px solid transparent;border-right:8px solid transparent;opacity:.4;transition:opacity .3s; }
.arrow-up   { border-bottom: 14px solid #00cfff; }
.arrow-down { border-top:    14px solid #ff6040; }
.arrow-indicator.active { opacity: 1; }
/* ── STORE ── */
#storeOverlay {
  position: absolute; inset: 0; background: rgba(0,4,14,0.97);
  display: none; flex-direction: column; align-items: center;
  overflow-y: auto; padding: 20px; z-index: 30;
}
#storeOverlay.open { display: flex; }
#storeHeader {
  width: 100%; max-width: 900px; display: flex;
  align-items: center; justify-content: space-between; margin-bottom: 18px;
}
#storeHeader h2 {
  font-size: clamp(18px,5vw,30px); letter-spacing: 6px;
  color: #ffd700; text-shadow: 0 0 20px #ffd700;
}
#storeCoins { font-size: clamp(14px,3vw,20px); color: #ffd700; letter-spacing: 2px; }
.sub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px,1fr));
  gap: 12px; width: 100%; max-width: 900px; margin-bottom: 20px;
}
.sub-card {
  background: rgba(0,16,34,0.85); border: 1px solid rgba(0,160,255,0.2);
  border-radius: 8px; padding: 10px; text-align: center;
  transition: border-color .2s, transform .15s; cursor: default;
}
.sub-card:hover { transform: translateY(-2px); }
.sub-card.owned   { border-color: rgba(0,255,150,0.4); }
.sub-card.active  { border-color: #ffd700; box-shadow: 0 0 14px rgba(255,215,0,0.3); }
.sub-card .preview-wrap {
  position: relative; width: 100%; padding-bottom: 50%; margin-bottom: 8px;
  background: rgba(0,8,24,0.9); border-radius: 4px; overflow: hidden;
}
.sub-card canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
}
.sub-card .sub-name {
  font-size: 11px; letter-spacing: 2px; color: #00cfff;
  text-transform: uppercase; margin-bottom: 4px;
}
.sub-card .sub-price { font-size: 13px; font-weight: bold; margin-bottom: 8px; }
.sub-card .sub-price.gold { color: #ffd700; }
.sub-card .sub-price.owned-label { color: #00ff88; font-size: 11px; letter-spacing: 1px; }
.sub-card .sub-price.selected-label { color: #ffd700; font-size: 11px; letter-spacing: 1px; }
.card-btn {
  display: block; width: 100%; padding: 7px 0; border-radius: 4px; cursor: pointer;
  font-family: 'Courier New', monospace; font-size: 10px; letter-spacing: 2px;
  text-transform: uppercase; transition: all .15s; border: 1px solid;
}
.card-btn.buy    { border-color: #ffd700; color: #ffd700; background: rgba(255,215,0,.08); }
.card-btn.buy:hover    { background: rgba(255,215,0,.2); }
.card-btn.buy:disabled { border-color: #555; color: #555; cursor: default; }
.card-btn.select { border-color: #00cfff; color: #00cfff; background: rgba(0,200,255,.08); }
.card-btn.select:hover { background: rgba(0,200,255,.2); }
.card-btn.equipped { border-color: #ffd700; color: #ffd700; background: rgba(255,215,0,.15); cursor: default; }
/* ── CAVE CARDS ── */
#caveSection { width:100%; max-width:900px; margin:20px 0 10px; }
#caveSectionTitle { font-size:12px; letter-spacing:4px; color:rgba(0,200,255,.6); text-transform:uppercase; padding-bottom:10px; margin-bottom:14px; border-bottom:1px solid rgba(0,200,255,.15); }
.cave-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(280px,1fr)); gap:14px; width:100%; }
.cave-card {
  background:rgba(0,14,28,.88); border:1px solid rgba(0,160,255,.2);
  border-radius:10px; padding:14px; transition:border-color .2s,transform .15s;
}
.cave-card:hover { transform:translateY(-2px); }
.cave-card.owned  { border-color:rgba(0,255,150,.4); }
.cave-card.active { border-color:#ffd700; box-shadow:0 0 16px rgba(255,215,0,.25); }
.cave-card .cave-preview {
  width:100%; height:90px; border-radius:6px; display:block;
  background:#000a18; margin-bottom:10px;
}
.cave-card .cave-name { font-size:12px; letter-spacing:3px; color:#00cfff; text-transform:uppercase; margin-bottom:3px; }
.cave-card .cave-desc { font-size:10px; color:rgba(150,200,255,.55); letter-spacing:1px; margin-bottom:8px; }
.cave-card .cave-price { font-size:13px; font-weight:bold; margin-bottom:8px; }
.cave-card .cave-price.gold { color:#ffd700; }
.cave-card .cave-price.owned-label { color:#00ff88; font-size:11px; }
.cave-card .cave-price.selected-label { color:#ffd700; font-size:11px; }