:root {
  --ink: #f4f7fb;
  --panel: rgba(12, 22, 38, 0.86);
  --accent: #2fb8a6;
  --accent-ink: #062420;
  --danger: #ef4b4b;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; background: #0f1a2b; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}
canvas { display: block; width: 100vw; height: 100vh; height: 100dvh; }
.hidden { display: none !important; }

#hud {
  position: fixed; top: 0; left: 0; right: 0;
  padding: calc(10px + env(safe-area-inset-top)) calc(16px + env(safe-area-inset-right)) 0 calc(16px + env(safe-area-inset-left));
  pointer-events: none;
}
.hud-row { display: flex; align-items: center; gap: 8px; }
.hud-row .weapon { margin-left: auto; }
/* Pause: top-right, 48x48 (>= 44 px touch target), the only HUD element that takes input. */
.pause-btn {
  pointer-events: auto; width: 48px; height: 48px; flex: none; border: 0; border-radius: 14px;
  background: var(--panel); display: flex; align-items: center; justify-content: center; gap: 6px; cursor: pointer;
}
.pause-btn span { width: 6px; height: 18px; border-radius: 2px; background: var(--ink); }
.pause-btn:active { transform: scale(0.94); }
.chip {
  background: var(--panel); border-radius: 999px; padding: 6px 12px;
  font-weight: 700; font-size: 14px;
}
.chip.weapon { color: #ffd84a; }
.chip.power { margin-top: 8px; color: #9fe8ff; font-size: 13px; }
.tip { margin: 10px auto 0; max-width: 340px; background: var(--panel); border-radius: 12px; padding: 8px 12px; font-size: 14px;
  font-weight: 600; line-height: 1.35; text-align: center; transition: opacity 0.4s; }
.tip.fade { opacity: 0; }
.progress { margin-top: 8px; height: 6px; background: rgba(255,255,255,0.18); border-radius: 3px; overflow: hidden; }
#hud-progress { height: 100%; width: 0; background: var(--accent); }
.boss { margin-top: 10px; display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 13px; color: #ff8a8a; }
.boss-track { flex: 1; height: 12px; background: rgba(0,0,0,0.45); border-radius: 6px; overflow: hidden; border: 1px solid rgba(255,255,255,0.25); }
#boss-fill { height: 100%; width: 100%; background: var(--danger); }

#overlay {
  position: fixed; inset: 0; display: flex; align-items: center; justify-content: center;
  background: rgba(8, 14, 24, 0.55);
  padding: calc(16px + env(safe-area-inset-top)) calc(16px + env(safe-area-inset-right))
    calc(16px + env(safe-area-inset-bottom)) calc(16px + env(safe-area-inset-left));
}
#overlay.clear { background: rgba(8, 14, 24, 0.25); }
.panel {
  background: var(--panel); border-radius: 18px; padding: 28px 24px; max-width: 360px; width: 100%;
  text-align: center; box-shadow: 0 12px 40px rgba(0,0,0,0.4);
  max-height: 100%; overflow-y: auto;
}
.panel h1 { font-size: 30px; letter-spacing: 0.5px; margin-bottom: 10px; }
.panel p { line-height: 1.45; opacity: 0.9; margin-bottom: 20px; }
.panel .sub { margin: 14px 0 0; font-size: 13px; opacity: 0.6; }
.panel button {
  background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 12px;
  font-size: 18px; font-weight: 800; padding: 14px 40px; cursor: pointer; width: 100%;
}
.panel button:active { transform: scale(0.98); }
.panel button + button { margin-top: 10px; }
.panel button:disabled { opacity: 0.6; cursor: default; }
.panel button.secondary { background: rgba(255,255,255,0.12); color: var(--ink); font-size: 16px; padding: 12px 24px; }
.panel button.danger { background: var(--danger); color: #fff; font-size: 16px; padding: 12px 24px; }
.setting { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 16px; font-weight: 700; }
.seg { display: flex; background: rgba(255,255,255,0.12); border-radius: 12px; padding: 3px; }
.panel .seg button { width: auto; margin: 0; padding: 8px 18px; font-size: 15px; background: transparent; color: var(--ink); border-radius: 10px; }
.panel .seg button.on { background: var(--accent); color: var(--accent-ink); }
.panel .wallet { margin: -8px 0 16px; font-weight: 700; color: #ffd84a; opacity: 1; }
/* letter D.4: "Chapter N: <name> · Level L/50" and the chapter progress bar */
.panel .chapter { margin: -6px 0 6px; font-weight: 700; opacity: 1; }
.panel .chapter:empty, .panel .chapter:empty + .chbar { display: none; }
.chbar { height: 8px; margin: 0 auto 16px; max-width: 260px; border-radius: 4px; background: rgba(255, 255, 255, 0.18); overflow: hidden; }
.chbar > div { height: 100%; width: 0; background: #7dffb2; }
.panel .wallet:empty { display: none; }
/* letter D.5: finish screen (stats + credits) and the menu's best endless level */
.panel .best { margin: -4px 0 12px; font-weight: 700; color: #7dffb2; opacity: 1; }
.panel .best:empty { display: none; }
.stats { margin: 0 0 18px; }
.stats > div { display: flex; justify-content: space-between; padding: 8px 4px; border-top: 1px solid rgba(255,255,255,0.1); }
.stats > div:last-child { border-bottom: 1px solid rgba(255,255,255,0.1); }
.credits { margin-top: 18px; text-align: left; font-size: 12px; }
.credits h2 { font-size: 13px; margin: 12px 0 4px; opacity: 0.85; }
.panel .credits p { margin: 0 0 4px; line-height: 1.35; opacity: 0.7; }
.panel button.gold { background: #ffc93c; color: #3a2600; }
/* shop rows */
.upg { display: flex; align-items: center; gap: 12px; text-align: left; padding: 10px 0; border-top: 1px solid rgba(255,255,255,0.1); }
.upg:last-child { border-bottom: 1px solid rgba(255,255,255,0.1); margin-bottom: 14px; }
.upg-info { flex: 1; display: flex; flex-direction: column; gap: 2px; font-size: 13px; }
.upg-info b { font-size: 16px; }
.upg-next { opacity: 0.65; }
.panel .upg button.buy { width: auto; min-width: 76px; min-height: 44px; margin: 0; padding: 8px 14px; font-size: 16px; background: #ffc93c; color: #3a2600; }
.panel .upg button.buy:disabled { background: rgba(255,255,255,0.12); color: var(--ink); }
/* vault: a chest built from divs; .opening shakes it, .open lifts the lid and lets the light out */
.vault-box { position: relative; width: 132px; height: 146px; margin: 0 auto 14px; }
.vault-box .chest { position: absolute; left: 6px; right: 6px; bottom: 0; height: 62px; border-radius: 8px;
  background: linear-gradient(#c7782d, #8a4a17); border: 4px solid #3b2210; box-shadow: inset 0 -8px 0 rgba(0,0,0,0.2); }
.vault-box .chest::after { content: ''; position: absolute; left: 50%; top: 10px; width: 20px; height: 24px; margin-left: -10px;
  background: #ffd84a; border: 3px solid #3b2210; border-radius: 4px; }
.vault-box .lid { position: absolute; left: 0; right: 0; top: 56px; height: 34px; border-radius: 14px 14px 6px 6px; z-index: 2;
  background: linear-gradient(#e0913d, #b3621f); border: 4px solid #3b2210; transform-origin: 12% 100%; transition: transform 0.35s ease-out; }
.vault-box .glow { position: absolute; left: 50%; top: 82px; width: 10px; height: 10px; margin-left: -5px; border-radius: 50%;
  background: #fff6c2; box-shadow: 0 0 0 0 rgba(255, 220, 90, 0.9); opacity: 0; z-index: 1; }
.vault-box.opening { animation: vault-shake 0.9s ease-in-out; }
.vault-box.open .lid { transform: translateY(-6px) rotate(-20deg); }
.vault-box.open .glow { opacity: 1; animation: vault-glow 0.7s ease-out forwards; }
@keyframes vault-shake {
  0%, 100% { transform: none; } 15% { transform: rotate(-6deg); } 30% { transform: rotate(6deg); }
  45% { transform: rotate(-8deg) scale(1.04); } 60% { transform: rotate(8deg) scale(1.06); } 80% { transform: scale(1.1); }
}
@keyframes vault-glow { from { box-shadow: 0 0 0 0 rgba(255, 220, 90, 0.9); } to { box-shadow: 0 0 40px 34px rgba(255, 220, 90, 0.35); } }
.vault-text { min-height: 1.45em; font-size: 20px; font-weight: 800; color: #ffd84a; }
@media (prefers-reduced-motion: reduce) { .vault-box.opening, .vault-box.open .glow { animation: none; } }

/* Phone in landscape: short screen, so tighten the panel instead of scrolling it. */
@media (max-height: 500px) {
  .panel { padding: 16px 20px; max-width: 420px; }
  .panel h1 { font-size: 22px; margin-bottom: 6px; }
  .panel p { margin-bottom: 10px; font-size: 14px; }
  .panel button { padding: 10px 24px; font-size: 16px; }
  .panel button + button { margin-top: 6px; }
  .panel .sub { margin-top: 8px; }
  .panel .wallet { margin: -4px 0 8px; }
  .panel .chapter { margin: -4px 0 4px; font-size: 14px; }
  .chbar { height: 6px; margin-bottom: 8px; }
  #scr-menu .sub { display: none; }
  .vault-box { transform: scale(0.7); margin: -30px auto -16px; }
  .upg { padding: 5px 0; }
}

/* 3D renderer: WebGL canvas plus DOM labels projected from the scene */
#gl { position: fixed; inset: 0; display: block; }
#labels { position: fixed; inset: 0; pointer-events: none; overflow: hidden; }
.lbl {
  position: absolute; left: 0; top: 0; white-space: nowrap; font-weight: 900; color: #fff;
  -webkit-text-stroke: 1px rgba(20, 18, 40, 0.9); paint-order: stroke fill;
  text-shadow: 0 2px 0 rgba(20, 18, 40, 0.55); will-change: transform;
}
.lbl.hp { font-size: 22px; -webkit-text-stroke: 2px #2a1a0c; text-shadow: 0 3px 0 #2a1a0c; }
.lbl.wname { font-size: 11px; letter-spacing: 0.3px; -webkit-text-stroke: 1.5px rgba(20, 18, 40, 0.9); }
.lbl.rec { font-size: 13px; }
.lbl.count {
  font-size: 18px; background: #2f6df6; border: 2px solid #1c1a2b; border-radius: 10px; padding: 1px 10px;
  box-shadow: 0 3px 0 #1c1a2b; -webkit-text-stroke: 0; text-shadow: 0 2px 0 rgba(0, 0, 0, 0.35);
}
.lbl.float { font-size: 20px; }
.lbl.gate { font-size: 30px; -webkit-text-stroke: 2px #0c2a44; text-shadow: 0 3px 0 #0c2a44; }
.lbl.gate.bad { color: #ffd0d0; -webkit-text-stroke: 2px #4a0c0c; text-shadow: 0 3px 0 #4a0c0c; }
.lbl.orb { font-size: 13px; color: #fff6c0; }
.lbl.crate { font-size: 14px; background: rgba(20, 18, 40, 0.8); border-radius: 8px; padding: 1px 8px; -webkit-text-stroke: 0; }
.lbl.float.big { font-size: 28px; }
#hud, #overlay { z-index: 2; }
/* F.6: the privacy link under the settings buttons */
.panel a.privacy { display: block; margin: 14px auto 0; font-size: 13px; color: var(--ink); opacity: 0.6; }