/* Rift Runner — theme */
:root {
  --bg: #080618;
  --green: #38ffb0;
  --cyan: #40d0ff;
  --pink: #ff4da6;
  --purple: #b060ff;
  --gold: #ffd240;
  --red: #ff4455;
  --text: #e8ecff;
  --dim: #8a90b8;
}

* { 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: #050410;
  box-shadow:
    0 0 0 1px rgba(64, 208, 255, 0.25),
    0 0 44px rgba(64, 208, 255, 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, 208, 255, 0.4);
}
#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); }

#sector-display { font-size: 14px; letter-spacing: 3px; color: var(--cyan); text-shadow: 0 0 10px rgba(64, 208, 255, 0.6); }
#goal { font-size: 12px; color: var(--dim); margin-top: 2px; }

#fuel-wrap { display: flex; align-items: center; gap: 8px; margin-top: 6px; justify-content: center; }
#fuel-track {
  width: 170px; height: 10px;
  border: 1px solid var(--cyan); border-radius: 5px;
  background: rgba(64, 208, 255, 0.10); overflow: hidden;
}
#fuel-bar {
  height: 100%; width: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--green));
  box-shadow: 0 0 12px var(--cyan);
  transition: width 0.1s linear;
}
#fuel-low { color: var(--red); font-size: 11px; letter-spacing: 2px; opacity: 0; transition: opacity 0.2s; }

#combo {
  display: inline-block; margin-top: 2px;
  font-size: 22px; font-weight: bold; color: var(--gold);
  text-shadow: 0 0 12px rgba(255, 210, 64, 0.8);
  transition: opacity 0.3s;
}
#shields { font-size: 13px; color: var(--purple); }
#lives { font-size: 15px; color: var(--pink); letter-spacing: 3px; }

/* ---------- Boss bar ---------- */
#boss-bar {
  position: absolute;
  top: 66px; 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(--cyan); border-color: var(--cyan); }

/* ---------- Screens ---------- */
.screen {
  position: absolute; inset: 0;
  display: none; flex-direction: column;
  align-items: center; justify-content: center;
  background: rgba(8, 6, 24, 0.9); z-index: 10;
  text-align: center; padding: 24px;
}
.screen h1 {
  font-size: 52px; letter-spacing: 8px; color: var(--cyan);
  text-shadow: 0 0 20px rgba(64, 208, 255, 0.8), 0 0 60px rgba(64, 208, 255, 0.4);
  margin-bottom: 8px;
}
.screen h2 {
  font-size: 30px; letter-spacing: 5px; color: var(--pink);
  text-shadow: 0 0 16px rgba(255, 77, 166, 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; max-width: 640px; }
.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(56, 255, 176, 0.6); transition: all 0.15s;
}
.btn:hover { background: rgba(56, 255, 176, 0.12); box-shadow: 0 0 20px rgba(56, 255, 176, 0.5); }
.btn.pink { border-color: var(--pink); color: var(--pink); text-shadow: 0 0 10px rgba(255, 77, 166, 0.6); }
.btn.pink:hover { background: rgba(255, 77, 166, 0.12); box-shadow: 0 0 20px rgba(255, 77, 166, 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(--cyan); }
.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(64, 208, 255, 0.4); border-radius: 6px; padding: 12px;
  background: rgba(64, 208, 255, 0.05);
}
.shop-icon { font-size: 26px; }
.shop-name { font-size: 13px; letter-spacing: 2px; color: var(--cyan); }
.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; }
  #fuel-track { width: 110px; }
}

/* ---------- top bar ---------- */
#topbar {
  position: absolute;
  top: 10px;
  right: 10px;
  display: flex;
  gap: 6px;
  z-index: 8;
}

.icon-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid rgba(64, 208, 255, 0.3);
  background: rgba(8, 6, 24, 0.6);
  color: var(--text);
  font-size: 14px;
  cursor: pointer;
  display: grid;
  place-items: center;
  text-decoration: none;
  line-height: 1;
}
.icon-btn:hover { background: rgba(64, 208, 255, 0.18); }

.back-link { color: var(--dim); font-size: 12px; text-decoration: none; }
.back-link:hover { color: var(--cyan); }