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

:root {
  --cyan:   #00f5ff;
  --pink:   #ff2d78;
  --yellow: #ffe600;
  --purple: #9b30ff;
  --bg:     #0a0010;
  --white:  #ffffff;
  --mono:   'Share Tech Mono', monospace;
}

html, body { width:100%; height:100%; overflow:hidden; background:var(--bg); }

/* ─── Canvas ────────────────────────────────────────────────────── */
#gameCanvas { display:block; width:100vw; height:100vh; }

/* ─── HUD ───────────────────────────────────────────────────────── */
#hud {
  position: fixed; top:0; left:0; right:0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 1.2rem 2rem;
  pointer-events: none;
  z-index: 10;
}

.hud-left, .hud-center, .hud-right {
  display:flex; flex-direction:column; align-items:center; gap:.15rem;
}

.hud-label {
  font-family: var(--mono); font-size:.55rem; letter-spacing:.2em;
  color:var(--cyan); opacity:.6;
}

#score, #level, #lives {
  font-family: var(--mono); font-size:1.2rem; color:var(--white);
  text-shadow: 0 0 8px var(--cyan), 0 0 20px var(--cyan);
  letter-spacing:.08em;
}

/* Mute button */
.mute-btn {
  position:absolute; top:1rem; right:1.5rem;
  pointer-events: all;
  font-size:1rem; background:transparent; border:none; cursor:pointer;
  color:rgba(255,255,255,0.3);
  transition:color .2s;
  font-family:var(--mono);
}
.mute-btn:hover { color:var(--cyan); text-shadow:0 0 8px var(--cyan); }

/* ─── Combo display ─────────────────────────────────────────────── */
#combo-display {
  position:fixed; top:5rem; left:50%; transform:translateX(-50%);
  font-family:var(--mono); font-size:1.1rem; letter-spacing:.15em;
  color:var(--yellow); text-shadow:0 0 14px var(--yellow);
  z-index:10; pointer-events:none;
  transition:opacity .3s;
}
#combo-display.hidden { display:none; }

/* ─── Upgrade HUD (bottom-center) ──────────────────────────────── */
#upgrade-hud {
  position:fixed; bottom:2rem; left:50%; transform:translateX(-50%);
  display:flex; gap:1rem; z-index:10; pointer-events:none;
}

.upgrade-slot {
  display:flex; flex-direction:column; align-items:center;
  border:1px solid rgba(0,245,255,0.2);
  border-radius:4px; padding:.45rem .9rem;
  min-width:130px; background:rgba(10,0,16,0.7);
  transition:border-color .3s, box-shadow .3s;
}

.upgrade-slot.active {
  border-color:var(--cyan);
  box-shadow:0 0 12px rgba(0,245,255,0.25), inset 0 0 8px rgba(0,245,255,0.05);
}

.slot-label {
  font-family:var(--mono); font-size:.5rem; letter-spacing:.18em;
  color:rgba(255,255,255,0.3); margin-bottom:.25rem;
}

.slot-empty {
  font-family:var(--mono); font-size:.62rem; letter-spacing:.1em;
  color:rgba(255,255,255,0.2);
}

.slot-name {
  font-family:var(--mono); font-size:.7rem; letter-spacing:.08em;
  font-weight:bold;
}

.slot-icon {
  font-size:1rem; margin-bottom:.2rem;
}

/* ─── Swap panel ────────────────────────────────────────────────── */
#swap-panel {
  position:fixed; bottom:6rem; left:50%; transform:translateX(-50%);
  background:rgba(10,0,16,0.92);
  border:1px solid var(--yellow);
  box-shadow:0 0 20px rgba(255,230,0,.2);
  border-radius:6px; padding:1rem 1.5rem;
  text-align:center; z-index:30; min-width:340px;
  backdrop-filter:blur(4px);
}
#swap-panel.hidden { display:none; }

.swap-title {
  font-family:var(--mono); font-size:.55rem; letter-spacing:.2em;
  color:var(--yellow); opacity:.7; margin-bottom:.3rem;
}

.swap-new {
  font-family:var(--mono); font-size:1rem; letter-spacing:.1em;
  color:var(--yellow); text-shadow:0 0 10px var(--yellow);
  margin-bottom:.5rem;
}

.swap-prompt {
  font-family:var(--mono); font-size:.6rem; letter-spacing:.15em;
  color:rgba(255,255,255,0.4); margin-bottom:.75rem;
}

.swap-choices { display:flex; gap:.6rem; justify-content:center; }

.swap-btn {
  font-family:var(--mono); font-size:.65rem; letter-spacing:.1em;
  color:var(--cyan); background:rgba(0,245,255,0.05);
  border:1px solid rgba(0,245,255,0.4); border-radius:3px;
  padding:.4rem .8rem; cursor:pointer;
  transition:background .2s, box-shadow .2s;
}
.swap-btn:hover { background:rgba(0,245,255,0.15); box-shadow:0 0 10px rgba(0,245,255,.3); }
.swap-btn.swap-decline { color:rgba(255,255,255,0.4); border-color:rgba(255,255,255,0.2); }
.swap-btn.swap-decline:hover { color:var(--pink); border-color:var(--pink); background:rgba(255,45,120,0.1); }

/* Countdown bar under swap panel */
#swap-timer-bar {
  margin-top:.75rem; height:2px;
  background:rgba(255,230,0,.15); border-radius:2px; overflow:hidden;
}
#swap-timer-fill {
  height:100%; width:100%; background:var(--yellow);
  transition:width .1s linear;
  box-shadow:0 0 6px var(--yellow);
}

/* ─── Overlay ───────────────────────────────────────────────────── */
#overlay {
  position:fixed; inset:0;
  display:flex; align-items:center; justify-content:center;
  z-index:20; background:rgba(10,0,16,0.8);
  backdrop-filter:blur(4px);
  opacity:0; pointer-events:none;
  transition:opacity .4s ease;
}
#overlay.visible { opacity:1; pointer-events:all; }
.hidden { display:none !important; }

#overlay-content { text-align:center; }

.game-title {
  font-family:var(--mono); font-size:clamp(3rem,8vw,6rem);
  font-weight:400; line-height:1; letter-spacing:.08em; color:var(--white);
  text-shadow:0 0 20px var(--cyan), 0 0 60px var(--cyan), 0 0 120px rgba(0,245,255,.4);
  margin:.5rem 0 1.5rem;
}

.overlay-sub {
  font-family:var(--mono); font-size:.75rem; letter-spacing:.3em;
  color:var(--pink); text-shadow:0 0 12px var(--pink);
  text-transform:uppercase; margin-bottom:.5rem;
}

.overlay-score-display {
  font-family:var(--mono); font-size:1rem; color:var(--yellow);
  text-shadow:0 0 10px var(--yellow); letter-spacing:.1em; margin-bottom:2rem;
}

/* Controls hint */
.controls-hint { display:flex; flex-direction:column; gap:.5rem; margin-bottom:2rem; align-items:center; }

.control-row {
  font-family:var(--mono); font-size:.72rem;
  color:rgba(255,255,255,0.5); letter-spacing:.05em;
  display:flex; align-items:center; gap:.4rem; flex-wrap:wrap; justify-content:center;
}

kbd {
  display:inline-block; padding:.15rem .4rem;
  border:1px solid rgba(0,245,255,0.4); border-radius:3px;
  font-family:var(--mono); font-size:.68rem;
  color:var(--cyan); background:rgba(0,245,255,0.05);
}

/* Title buttons */
.title-buttons { display:flex; flex-direction:column; gap:.75rem; align-items:center; }

/* ─── Neon button ───────────────────────────────────────────────── */
.neon-btn {
  font-family:var(--mono); font-size:.8rem; letter-spacing:.2em;
  color:var(--cyan); background:transparent;
  border:1px solid var(--cyan); padding:.75rem 2rem; cursor:pointer;
  text-transform:uppercase;
  box-shadow:0 0 10px rgba(0,245,255,.3), inset 0 0 10px rgba(0,245,255,.05);
  transition:box-shadow .2s, background .2s;
}
.neon-btn:hover {
  background:rgba(0,245,255,.1);
  box-shadow:0 0 20px rgba(0,245,255,.6), inset 0 0 20px rgba(0,245,255,.1);
}
.neon-btn--secondary {
  color:rgba(255,255,255,0.4); border-color:rgba(255,255,255,0.2);
  box-shadow:none;
}
.neon-btn--secondary:hover {
  color:var(--white); border-color:rgba(255,255,255,0.5);
  background:rgba(255,255,255,0.05); box-shadow:none;
}

/* ─── Initials entry ────────────────────────────────────────────── */
.initials-prompt {
  font-family:var(--mono); font-size:.75rem; letter-spacing:.2em;
  color:rgba(255,255,255,0.5); margin-bottom:1.2rem;
}

#initials-display {
  display:flex; gap:1rem; justify-content:center; margin-bottom:1rem;
}

.initial-box {
  font-family:var(--mono); font-size:2.5rem; letter-spacing:.05em;
  color:var(--cyan);
  text-shadow:0 0 14px var(--cyan);
  border-bottom:2px solid var(--cyan);
  width:2.5rem; text-align:center; display:inline-block;
}
.initial-box.active {
  animation:blink-cursor .6s step-end infinite;
}
@keyframes blink-cursor {
  0%,100% { border-bottom-color:var(--cyan); }
  50%      { border-bottom-color:transparent; }
}

.initials-hint {
  font-family:var(--mono); font-size:.6rem; letter-spacing:.1em;
  color:rgba(255,255,255,0.25); margin-top:.5rem;
}

/* ─── Leaderboard ───────────────────────────────────────────────── */
#leaderboard-table {
  width:100%; max-width:420px; margin:0 auto;
  border-collapse:collapse;
  font-family:var(--mono); font-size:.8rem;
}

#leaderboard-table th {
  font-size:.55rem; letter-spacing:.2em; color:var(--cyan); opacity:.7;
  padding:.3rem .8rem; text-align:left; border-bottom:1px solid rgba(0,245,255,.2);
}

#leaderboard-table td {
  padding:.45rem .8rem; color:rgba(255,255,255,0.7);
  border-bottom:1px solid rgba(255,255,255,0.06);
}

#leaderboard-table tr.new-entry td {
  color:var(--yellow);
  text-shadow:0 0 8px var(--yellow);
  background:rgba(255,230,0,0.05);
}

.lb-buttons { display:flex; gap:1rem; justify-content:center; }

/* ─── Pause ─────────────────────────────────────────────────────── */
.pause-hint {
  font-family:var(--mono); font-size:.75rem; letter-spacing:.15em;
  color:rgba(255,255,255,0.35); margin-top:1rem;
}

/* ─── Back link ─────────────────────────────────────────────────── */
.back-link {
  position:fixed; bottom:1.5rem; left:2rem;
  font-family:var(--mono); font-size:.7rem; letter-spacing:.1em;
  color:rgba(255,255,255,0.3); text-decoration:none; z-index:10;
  transition:color .2s;
}
.back-link:hover { color:var(--cyan); text-shadow:0 0 8px var(--cyan); }