/* ── Reset & root ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --pink:       #ff2d78;
  --cyan:       #00e5ff;
  --purple:     #9d00ff;
  --violet:     #c724ff;
  --gold:       #ffcc00;
  --bg:         #08000f;
  --bg2:        #0e001c;
  --bg3:        #130020;
  --text:       #ddc8ff;
  --text-dim:   #8a6aaa;
  --red:        #ff4444;
  --border:     #2a0048;
  --border-dim: #1a0030;
  --side-w:     200px;
  --header-h:   46px;
  --font:       'Courier New', Courier, monospace;
  --glow-pink:  0 0 8px #ff2d78aa, 0 0 24px #ff2d7844;
  --glow-cyan:  0 0 8px #00e5ffaa, 0 0 24px #00e5ff44;
  --glow-gold:  0 0 8px #ffcc00aa, 0 0 24px #ffcc0044;
  --glow-purple:0 0 8px #9d00ffaa, 0 0 24px #9d00ff44;
}

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.4;
}

/* ── Header ──────────────────────────────────────────────────────────────── */
header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  flex-shrink: 0;
}

.logo {
  font-size: 18px;
  font-weight: bold;
  color: var(--purple);
  text-shadow: var(--glow-purple);
  letter-spacing: 0.04em;
}

.tagline {
  font-size: 11px;
  color: var(--text-dim);
  margin-left: auto;
}

.tagline a {
  color: var(--cyan);
  text-decoration: none;
}
.tagline a:hover {
  text-decoration: underline;
}

/* ── Main layout ─────────────────────────────────────────────────────────── */
body {
  display: flex;
  flex-direction: column;
}

#game-wrap {
  display: flex;
  flex: 1;
  min-height: 0;
}

/* ── Canvas area ─────────────────────────────────────────────────────────── */
#canvas-area {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2px;
  min-width: 0;
  position: relative;
  background: var(--bg);
}

#game-canvas {
  display: block;
  cursor: crosshair;
  image-rendering: pixelated;
}

/* ── Pause overlay ────────────────────────────────────────────────────────── */
#pause-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8, 0, 15, 0.72);
  backdrop-filter: blur(2px);
  z-index: 10;
}

#pause-overlay.hidden { display: none; }

.pause-box {
  text-align: center;
  border: 1px solid var(--purple);
  padding: 28px 40px;
  background: var(--bg2);
  box-shadow: var(--glow-purple), inset 0 0 40px rgba(157,0,255,0.06);
}

.pause-title {
  font-size: 28px;
  font-weight: bold;
  color: var(--purple);
  text-shadow: var(--glow-purple);
  letter-spacing: 0.12em;
  margin-bottom: 16px;
}

/* ── Side panel ───────────────────────────────────────────────────────────── */
#side-panel {
  width: var(--side-w);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
  background: var(--bg2);
  overflow-y: auto;
  overflow-x: hidden;
}

/* ── Stats ────────────────────────────────────────────────────────────────── */
#stats {
  padding: 10px 10px 6px;
  border-bottom: 1px solid var(--border-dim);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 6px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg3);
  border: 1px solid var(--border-dim);
  padding: 4px 6px;
}

.stat .label {
  font-size: 9px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stat .value {
  font-size: 16px;
  font-weight: bold;
  color: var(--gold);
  text-shadow: var(--glow-gold);
  line-height: 1.1;
}

.stat:nth-child(3) .value { color: var(--pink);   text-shadow: var(--glow-pink); }
.stat:nth-child(4) .value { color: var(--cyan);   text-shadow: var(--glow-cyan); }
.stat:nth-child(1) .value { color: var(--gold);   text-shadow: var(--glow-gold); }
.stat:nth-child(2) .value { color: var(--violet); text-shadow: var(--glow-purple); }

#stat-gold.broke {
  color: var(--red) !important;
  text-shadow: 0 0 8px #ff4444aa, 0 0 20px #ff444444 !important;
  animation: pulse-broke 1.2s ease-in-out infinite;
}
@keyframes pulse-broke {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.45; }
}

/* ── Wave status ─────────────────────────────────────────────────────────── */
#wave-status {
  padding: 8px 10px 6px;
  border-bottom: 1px solid var(--border-dim);
}

#wave-phase-label {
  font-size: 10px;
  font-weight: bold;
  letter-spacing: 0.1em;
  color: var(--cyan);
  text-shadow: var(--glow-cyan);
  margin-bottom: 4px;
}

#wave-timer-wrap {
  position: relative;
  height: 6px;
  background: var(--bg);
  border: 1px solid var(--border-dim);
  margin-bottom: 6px;
}

#wave-timer-fill {
  height: 100%;
  background: var(--cyan);
  box-shadow: 0 0 6px var(--cyan);
  transition: width 0.25s linear;
  width: 100%;
}

#wave-timer-val {
  position: absolute;
  right: 0;
  top: -14px;
  font-size: 9px;
  color: var(--text-dim);
}

#wave-actions {
  display: flex;
  gap: 6px;
}

#send-wave-btn {
  flex: 1;
  background: transparent;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font-family: var(--font);
  font-size: 11px;
  padding: 5px;
  cursor: pointer;
  letter-spacing: 0.06em;
  transition: background 0.15s, box-shadow 0.15s;
}
#send-wave-btn:hover {
  background: rgba(0, 229, 255, 0.12);
  box-shadow: var(--glow-cyan);
}

/* Fast-forward / speed toggle */
#speed-btn {
  flex: 0 0 auto;
  min-width: 40px;
  background: transparent;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: var(--font);
  font-size: 11px;
  font-weight: bold;
  padding: 5px 8px;
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: background 0.15s, box-shadow 0.15s;
}
#speed-btn:hover {
  background: rgba(255, 204, 0, 0.12);
}
#speed-btn.boosted {
  background: rgba(255, 204, 0, 0.18);
  box-shadow: 0 0 8px var(--gold);
}

/* ── Transmutation overlay (boss reset) ──────────────────────────────────── */
#transmutation-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 15;
  pointer-events: none;
}
#transmutation-overlay.hidden { display: none; }

.trans-box {
  text-align: center;
  padding: 20px 36px;
  background: rgba(8, 0, 15, 0.72);
  border: 1px solid var(--gold);
  box-shadow: var(--glow-gold), inset 0 0 40px rgba(255,204,0,0.06);
  animation: trans-fadein 0.35s ease-out;
}

.trans-title {
  font-size: 14px;
  font-weight: bold;
  color: var(--gold);
  text-shadow: var(--glow-gold);
  letter-spacing: 0.14em;
  margin-bottom: 6px;
}

.trans-block {
  font-size: 34px;
  font-weight: bold;
  color: var(--gold);
  text-shadow: 0 0 16px #ffcc00dd, 0 0 48px #ffcc0088;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.trans-bonus {
  font-size: 15px;
  font-weight: bold;
  color: var(--gold);
  text-shadow: var(--glow-gold);
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.trans-sub {
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

@keyframes trans-fadein {
  from { opacity: 0; transform: scale(0.88); }
  to   { opacity: 1; transform: scale(1); }
}

/* ── Game over overlay ────────────────────────────────────────────────────── */
#gameover-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(8, 0, 15, 0.82);
  backdrop-filter: blur(3px);
  z-index: 20;
}
#gameover-overlay.hidden { display: none; }

.gameover-box {
  text-align: center;
  border: 1px solid var(--pink);
  padding: 32px 44px;
  background: var(--bg2);
  box-shadow: var(--glow-pink), inset 0 0 50px rgba(255,45,120,0.05);
}

.gameover-title {
  font-size: 26px;
  font-weight: bold;
  color: var(--pink);
  text-shadow: var(--glow-pink);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.gameover-stats {
  font-size: 13px;
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.8;
}

.go-val {
  color: var(--gold);
  font-weight: bold;
  text-shadow: var(--glow-gold);
}

#restart-btn {
  background: transparent;
  border: 1px solid var(--pink);
  color: var(--pink);
  font-family: var(--font);
  font-size: 13px;
  padding: 8px 28px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s;
}
#restart-btn:hover {
  background: rgba(255, 45, 120, 0.15);
  box-shadow: var(--glow-pink);
}

/* ── Tool section ────────────────────────────────────────────────────────── */
#tools {
  padding: 8px;
  flex: 1;
}
#tools.hidden { display: none; }

.tool-section-title {
  font-size: 9px;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 2px 4px;
  border-bottom: 1px solid var(--border-dim);
  margin-bottom: 4px;
}

.tool-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  margin-bottom: 3px;
  background: var(--bg);
  border: 1px solid var(--border-dim);
  color: var(--text);
  font-family: var(--font);
  font-size: 12px;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
  position: relative;
}

.tool-btn:hover:not(.locked) {
  background: var(--bg3);
  border-color: var(--purple);
}

.tool-btn.active {
  background: #1a0030;
  border-color: var(--purple);
  box-shadow: inset 0 0 12px rgba(157,0,255,0.15), var(--glow-purple);
}

.tool-btn.locked {
  opacity: 0.35;
  cursor: not-allowed;
}

.tool-btn.cant-afford {
  opacity: 0.5;
}
.tool-btn.cant-afford .tool-cost {
  color: var(--red);
}
.tool-btn.cant-afford .tool-name {
  color: var(--text-dim);
}

.tool-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  border: 1px solid currentColor;
}

/* Wall icon: lead-colored */
.tool-btn[data-tool="wall"]    .tool-icon { border-color: #2e2e42; background: #1e1e2e; color: #555570; }
/* Tower icons: colored by element */
.tool-btn[data-tool="rapid"]   .tool-icon { border-color: #00e5ff; color: #00e5ff; background: rgba(0,229,255,0.08); }
.tool-btn[data-tool="heavy"]   .tool-icon { border-color: #9d00ff; color: #9d00ff; background: rgba(157,0,255,0.08); }
.tool-btn[data-tool="splash"]  .tool-icon { border-color: #ff2d78; color: #ff2d78; background: rgba(255,45,120,0.08); }
.tool-btn[data-tool="slow"]    .tool-icon { border-color: #c724ff; color: #c724ff; background: rgba(199,36,255,0.08); }
.tool-btn[data-tool="destroy"] .tool-icon { border-color: #ff4444; color: #ff4444; background: rgba(255,68,68,0.08); }

.tool-name {
  flex: 1;
  font-weight: bold;
}

.tool-cost {
  font-size: 10px;
  color: var(--gold);
  flex-shrink: 0;
}

.tool-btn.locked .tool-cost { color: var(--text-dim); }

/* ── Upgrade panel ───────────────────────────────────────────────────────── */
#upgrade-panel {
  padding: 8px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
#upgrade-panel.hidden { display: none; }

#upg-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-dim);
}

.upg-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  border: 1px solid currentColor;
}

#upg-meta { flex: 1; min-width: 0; }

#upg-name {
  font-weight: bold;
  font-size: 13px;
  color: var(--text);
}

#upg-tier {
  font-size: 12px;
  color: var(--gold);
  text-shadow: var(--glow-gold);
  letter-spacing: 0.06em;
}

#upg-stats {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.upg-stat {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 3px 7px;
  background: var(--bg3);
  border: 1px solid var(--border-dim);
}

.upg-stat-label {
  font-size: 9px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.upg-stat-val {
  font-size: 13px;
  font-weight: bold;
  color: var(--text);
}

#upgrade-btn {
  width: 100%;
  background: transparent;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: var(--font);
  font-size: 10px;
  padding: 8px 4px;
  letter-spacing: 0.04em;
  cursor: pointer;
  text-transform: uppercase;
  transition: background 0.15s, box-shadow 0.15s;
}
#upgrade-btn:hover:not(:disabled) {
  background: rgba(255, 204, 0, 0.12);
  box-shadow: var(--glow-gold);
}
#upgrade-btn:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}
#upgrade-btn.maxed {
  border-color: var(--text-dim);
  color: var(--text-dim);
}

#deselect-btn {
  width: 100%;
  background: transparent;
  border: 1px solid var(--border-dim);
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 10px;
  padding: 5px;
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: border-color 0.15s, color 0.15s;
}
#deselect-btn:hover {
  border-color: var(--purple);
  color: var(--text);
}

/* ── Controls help ──────────────────────────────────────────────────────── */
#controls-help {
  padding: 8px 10px;
  border-top: 1px solid var(--border-dim);
  font-size: 10px;
  color: var(--text-dim);
  text-align: center;
}

/* ── Ad slot ─────────────────────────────────────────────────────────────── */
#ad-slot {
  padding: 8px;
  border-top: 1px solid var(--border-dim);
  flex-shrink: 0;
}

.ad-placeholder {
  height: 70px;
  border: 1px dashed var(--border-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: rgba(255,255,255,0.01);
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */
button {
  font-family: var(--font);
  cursor: pointer;
}

#resume-btn {
  background: transparent;
  border: 1px solid var(--purple);
  color: var(--purple);
  padding: 8px 28px;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background 0.15s, box-shadow 0.15s;
}

#resume-btn:hover {
  background: rgba(157,0,255,0.15);
  box-shadow: var(--glow-purple);
}

/* ── Scrollbar ───────────────────────────────────────────────────────────── */
::-webkit-scrollbar       { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ── #hud-top wrapper (desktop: transparent block; mobile: flex row) ─────── */
#hud-top { display: block; }

/* ── Mobile pause button (hidden on desktop, shown on mobile) ────────────── */
#mobile-pause-btn { display: none; }

/* ── Touch confirm overlay (any touch screen, not just mobile) ───────────── */
#touch-confirm-overlay {
  position: absolute;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 5;
  pointer-events: auto;
}
#touch-confirm-overlay.hidden { display: none; }

#touch-confirm-btn {
  background: rgba(0, 229, 255, 0.15);
  border: 2px solid var(--cyan);
  color: var(--cyan);
  font-family: var(--font);
  font-size: 14px;
  font-weight: bold;
  padding: 10px 22px;
  min-height: 48px;
  cursor: pointer;
  letter-spacing: 0.05em;
  box-shadow: 0 0 10px #00e5ffaa;
  white-space: nowrap;
}
#touch-confirm-btn:active {
  background: rgba(0, 229, 255, 0.30);
}

#touch-cancel-btn {
  background: rgba(255, 68, 68, 0.12);
  border: 2px solid var(--red);
  color: var(--red);
  font-family: var(--font);
  font-size: 16px;
  padding: 10px 18px;
  min-height: 48px;
  cursor: pointer;
}
#touch-cancel-btn:active {
  background: rgba(255, 68, 68, 0.28);
}

/* ── Mobile layout (portrait phone ≤ 640px) ──────────────────────────────── */
@media (max-width: 640px) {
  :root { --header-h: 40px; }

  /* --- Main layout: canvas stacked above bottom toolbar ------------------ */
  #game-wrap {
    flex-direction: column;
  }

  #canvas-area {
    flex: 1;
    min-height: 0;    /* allows shrink inside flex column */
    width: 100%;
    padding: 2px;
  }

  /* --- Side panel becomes a compact bottom bar --------------------------- */
  #side-panel {
    width: 100%;
    flex-shrink: 0;
    border-left: none;
    border-top: 1px solid var(--border);
    flex-direction: column;
    overflow: hidden;
    /* natural height from children — hud-top + tools row */
  }

  /* --- HUD top row: stats + wave status + pause btn side-by-side --------- */
  #hud-top {
    display: flex;
    flex-direction: row;
    align-items: stretch;
    flex-shrink: 0;
    border-bottom: 1px solid var(--border-dim);
    height: 54px;
    overflow: hidden;
  }

  #stats {
    display: flex;
    flex-direction: row;
    grid-template-columns: none;
    padding: 4px 5px;
    gap: 3px;
    border-bottom: none;
    border-right: 1px solid var(--border-dim);
    align-items: stretch;
    flex-shrink: 0;
  }

  .stat {
    width: 38px;
    flex-direction: column;
    justify-content: center;
    padding: 2px 3px;
  }

  .stat .label { font-size: 8px; }
  .stat .value { font-size: 13px; }

  #wave-status {
    flex: 1;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 4px;
    padding: 4px 5px;
    border-bottom: none;
    min-width: 0;
    overflow: hidden;
  }

  #wave-phase-label {
    font-size: 8px;
    letter-spacing: 0.04em;
    margin-bottom: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-shrink: 1;
    min-width: 0;
  }

  #wave-timer-wrap {
    flex: 1;
    margin-bottom: 0;
    min-width: 24px;
    max-width: 60px;
  }

  #wave-timer-val { display: none; }

  /* Stack Send Wave + speed vertically so the row's horizontal footprint
     stays the same as when only Send Wave existed (the bar is tight). */
  #wave-actions {
    flex-shrink: 0;
    flex-direction: column;
    gap: 3px;
    justify-content: center;
  }

  #send-wave-btn {
    flex: 0 0 auto;
    font-size: 9px;
    padding: 3px 7px;
    width: 100%;
    white-space: nowrap;
    min-height: 22px;
  }

  #speed-btn {
    flex: 0 0 auto;
    font-size: 10px;
    padding: 2px 7px;
    width: 100%;
    min-height: 21px;
  }

  #mobile-pause-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 40px;
    background: transparent;
    border: none;
    border-left: 1px solid var(--border-dim);
    color: var(--text-dim);
    font-size: 14px;
    font-family: var(--font);
    cursor: pointer;
  }
  #mobile-pause-btn:active { background: var(--bg3); }

  /* --- Tools row: horizontal scroll of large-target buttons -------------- */
  #tools {
    display: flex;
    flex-direction: row;
    align-items: stretch;
    padding: 5px 6px;
    gap: 4px;
    flex: 1;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  #tools::-webkit-scrollbar { display: none; }
  #tools.hidden { display: none; }

  .tool-section-title { display: none; }

  .tool-btn {
    width: auto;
    min-width: 52px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2px;
    padding: 5px 7px;
    margin-bottom: 0;
    flex-shrink: 0;
    min-height: 44px;
    text-align: center;
  }

  .tool-icon {
    width: 26px;
    height: 26px;
    font-size: 13px;
    margin: 0 auto;
  }

  .tool-name {
    font-size: 8px;
    letter-spacing: 0.04em;
    text-align: center;
    flex: 0;
  }

  .tool-cost {
    font-size: 8px;
    text-align: center;
  }

  /* --- Upgrade panel on mobile: horizontal layout ----------------------- */
  #upgrade-panel {
    display: flex;
    flex-direction: row;
    flex: 1;
    padding: 5px 8px;
    gap: 6px;
    align-items: center;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  #upgrade-panel.hidden { display: none; }

  #upg-header {
    flex-shrink: 0;
    flex-direction: column;
    align-items: center;
    padding-bottom: 0;
    border-bottom: none;
    border-right: 1px solid var(--border-dim);
    padding-right: 8px;
    gap: 2px;
    min-width: 46px;
  }

  #upg-meta { text-align: center; min-width: 0; }
  #upg-name { font-size: 9px; }
  #upg-tier { font-size: 10px; }

  #upg-stats {
    flex-direction: row;
    flex-shrink: 0;
    gap: 3px;
  }

  .upg-stat {
    flex-direction: column;
    padding: 3px 6px;
    align-items: center;
    min-width: 38px;
  }

  #upgrade-btn {
    flex-shrink: 0;
    padding: 8px 10px;
    font-size: 9px;
    width: auto;
    min-width: 80px;
    min-height: 44px;
  }

  #deselect-btn {
    flex-shrink: 0;
    padding: 8px 10px;
    font-size: 10px;
    width: auto;
    min-height: 44px;
  }

  /* --- Hide desktop-only elements --------------------------------------- */
  #controls-help { display: none; }
  #ad-slot       { display: none; }
}