/* Neon Viper — theme */
:root {
  --bg: #0a0818;
  --grid: #171230;
  --green: #40ff80;
  --pink: #ff44aa;
  --purple: #b060ff;
  --gold: #ffd240;
  --red: #ff4455;
  --blue: #40d0ff;
  --text: #e8e6ff;
  --dim: #8a86b0;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Courier New", monospace;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#stage {
  position: relative;
  width: min(100vw - 20px, calc((100vh - 20px) * 8 / 5), 1000px);
  aspect-ratio: 8 / 5;
  overflow: hidden;
  background: #07050f;
  box-shadow:
    0 0 0 1px rgba(64, 255, 128, 0.25),
    0 0 40px rgba(64, 255, 128, 0.10),
    0 24px 80px rgba(0, 0, 0, 0.6);
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ---------- HUD ---------- */

#hud {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 12px 18px;
  pointer-events: none;
  font-size: 13px;
  text-shadow: 0 0 8px rgba(64, 255, 128, 0.5);
}
#hud.hidden { display: none; }

.hud-left { text-align: left; }
.hud-mid { text-align: center; }
.hud-right { text-align: right; }
.hud-left > div { margin-right: 22px; display: inline-block; }
.hud-right > div { margin-left: 22px; display: inline-block; }

.label {
  font-size: 10px;
  color: var(--dim);
  letter-spacing: 2px;
}
.val { font-size: 17px; font-weight: bold; color: var(--green); }

#level-display {
  font-size: 14px;
  letter-spacing: 3px;
  color: var(--pink);
  text-shadow: 0 0 10px rgba(255, 68, 170, 0.6);
}
#goal { font-size: 12px; color: var(--dim); margin-top: 2px; }

#combo {
  display: inline-block;
  font-size: 22px;
  font-weight: bold;
  color: var(--gold);
  text-shadow: 0 0 12px rgba(255, 210, 64, 0.8);
  transition: opacity 0.3s;
}

#buffs { margin-top: 4px; }
#buffs .buff {
  display: inline-block;
  margin: 0 4px;
  font-size: 11px;
  color: var(--blue);
  border: 1px solid rgba(64, 208, 255, 0.5);
  border-radius: 3px;
  padding: 1px 6px;
  background: rgba(64, 208, 255, 0.08);
}

#shields { font-size: 13px; color: var(--blue); }
#lives { font-size: 15px; color: var(--pink); letter-spacing: 3px; }

/* ---------- Boss bar ---------- */

#boss-bar {
  position: absolute;
  top: 64px;
  left: 50%;
  transform: translateX(-50%);
  width: 420px;
  max-width: 70vw;
  display: none;
  pointer-events: none;
  text-align: center;
}
#boss-name {
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--purple);
  text-shadow: 0 0 10px rgba(176, 96, 255, 0.8);
  margin-bottom: 4px;
}
#boss-hp-container {
  height: 10px;
  border: 1px solid var(--purple);
  border-radius: 5px;
  background: rgba(176, 96, 255, 0.1);
  overflow: hidden;
}
#boss-hp-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--purple), var(--pink));
  box-shadow: 0 0 12px var(--purple);
  transition: width 0.2s;
}

/* ---------- Mute ---------- */

#mute-btn {
  position: absolute;
  bottom: 10px;
  right: 12px;
  background: none;
  border: 1px solid var(--dim);
  color: var(--dim);
  font-family: inherit;
  font-size: 11px;
  letter-spacing: 2px;
  padding: 4px 10px;
  border-radius: 3px;
  cursor: pointer;
  z-index: 20;
}
#mute-btn:hover { color: var(--green); border-color: var(--green); }

/* ---------- Screens ---------- */

.screen {
  position: absolute;
  inset: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(10, 8, 24, 0.88);
  z-index: 10;
  text-align: center;
  padding: 24px;
}

.screen h1 {
  font-size: 52px;
  letter-spacing: 8px;
  color: var(--green);
  text-shadow: 0 0 20px rgba(64, 255, 128, 0.8), 0 0 60px rgba(64, 255, 128, 0.4);
  margin-bottom: 8px;
}
.screen h2 {
  font-size: 30px;
  letter-spacing: 5px;
  color: var(--pink);
  text-shadow: 0 0 16px rgba(255, 68, 170, 0.7);
  margin-bottom: 14px;
}
.screen h3 { font-size: 14px; color: var(--dim); font-weight: normal; letter-spacing: 2px; }
.screen p { margin-bottom: 10px; color: var(--dim); font-size: 14px; }
.screen p strong { color: var(--text); }
.controls { font-size: 12px; color: var(--dim); }

.btn {
  background: none;
  border: 2px solid var(--green);
  color: var(--green);
  font-family: inherit;
  font-size: 15px;
  letter-spacing: 3px;
  padding: 10px 30px;
  border-radius: 4px;
  cursor: pointer;
  margin: 8px;
  text-shadow: 0 0 10px rgba(64, 255, 128, 0.6);
  transition: all 0.15s;
}
.btn:hover {
  background: rgba(64, 255, 128, 0.12);
  box-shadow: 0 0 20px rgba(64, 255, 128, 0.5);
}
.btn.pink {
  border-color: var(--pink);
  color: var(--pink);
  text-shadow: 0 0 10px rgba(255, 68, 170, 0.6);
}
.btn.pink:hover {
  background: rgba(255, 68, 170, 0.12);
  box-shadow: 0 0 20px rgba(255, 68, 170, 0.5);
}

/* ---------- Score entry & list ---------- */

.score-entry { display: none; gap: 8px; margin: 10px 0; }
.score-entry input {
  background: none;
  border: 1px solid var(--dim);
  color: var(--text);
  font-family: inherit;
  font-size: 18px;
  letter-spacing: 6px;
  width: 90px;
  text-align: center;
  text-transform: uppercase;
  padding: 6px;
  border-radius: 3px;
}
.score-entry input:focus { outline: none; border-color: var(--green); }

.score-list {
  list-style: none;
  margin: 10px 0;
  min-width: 240px;
  text-align: left;
}
.score-list li {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  font-size: 14px;
  padding: 2px 8px;
}
.score-list li span:first-child { color: var(--pink); }
.score-list li span:last-child { color: var(--green); }

/* ---------- Shop ---------- */

#shop-overlay { overflow-y: auto; }

#continue-btn {
  background: none;
  border: 2px solid var(--gold);
  color: var(--gold);
  font-family: inherit;
  font-size: 16px;
  letter-spacing: 3px;
  padding: 12px 36px;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 14px;
  text-shadow: 0 0 10px rgba(255, 210, 64, 0.6);
}
#continue-btn:hover {
  background: rgba(255, 210, 64, 0.12);
  box-shadow: 0 0 20px rgba(255, 210, 64, 0.5);
}

#shop-items {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 10px;
  width: 720px;
  max-width: 90vw;
  margin: 14px 0;
}
.shop-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  border: 1px solid rgba(176, 96, 255, 0.4);
  border-radius: 6px;
  padding: 12px;
  background: rgba(176, 96, 255, 0.05);
}
.shop-icon { font-size: 26px; }
.shop-name { font-size: 13px; letter-spacing: 2px; color: var(--purple); }
.shop-desc { font-size: 11px; color: var(--dim); min-height: 28px; }
.shop-btn {
  background: none;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: inherit;
  font-size: 12px;
  padding: 4px 14px;
  border-radius: 3px;
  cursor: pointer;
}
.shop-btn:hover:not(:disabled) { background: rgba(255, 210, 64, 0.15); }
.shop-btn:disabled {
  border-color: var(--dim);
  color: var(--dim);
  cursor: default;
}

@media (max-width: 700px) {
  .screen h1 { font-size: 34px; }
  #hud { font-size: 11px; padding: 8px 10px; }
  .val { font-size: 14px; }
  .hud-left > div, .hud-right > div { margin-right: 10px; margin-left: 10px; }
}