:root {
  --space-bg: #030712;
  --panel: rgba(5, 12, 26, 0.72);
  --line: rgba(120, 245, 255, 0.2);
  --text: #f5fbff;
  --muted: #9fb3ca;
  --cyan: #65f2ff;
  --gold: #ffd76a;
  --danger: #ff4d7d;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: radial-gradient(circle at 50% 35%, #09234b 0%, var(--space-bg) 54%, #01030a 100%);
  color: var(--text);
  font-family: "Trebuchet MS", system-ui, sans-serif;
  touch-action: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
}

canvas {
  display: block;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
}

#loading {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 50;
  background: radial-gradient(circle, rgba(101, 242, 255, 0.18), rgba(3, 7, 18, 0.96));
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.22em;
}

body.ready #loading {
  display: none;
}

#menu-toggle,
.top-buttons,
#hud,
#instruction-chip,
#controls,
#overlay {
  position: fixed;
  z-index: 20;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
}

#menu-toggle {
  top: max(14px, env(safe-area-inset-top));
  right: max(14px, env(safe-area-inset-right));
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  z-index: 42;
}

.top-buttons {
  top: max(14px, env(safe-area-inset-top));
  left: max(14px, env(safe-area-inset-left));
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  z-index: 40;
}

.top-buttons a {
  min-height: 40px;
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  backdrop-filter: blur(12px);
}

#hud {
  top: 76px;
  left: max(14px, env(safe-area-inset-left));
  width: min(320px, calc(100vw - 28px));
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(160deg, rgba(5, 12, 26, 0.84), rgba(5, 20, 40, 0.62));
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(16px);
}

.hud-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.hud-title,
.hud-item-label,
.hud-meter-label {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.68rem;
}

.hud-value {
  color: var(--gold);
  font-size: 1.8rem;
}

.hud-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 12px;
}

.hud-item {
  padding: 10px;
  border: 1px solid rgba(120, 245, 255, 0.14);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
}

.hud-item-value {
  display: block;
  margin-top: 5px;
  color: var(--text);
}

.hud-meter {
  margin-top: 12px;
}

.hud-meter-label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.meter-track {
  height: 10px;
  margin-top: 8px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
}

.meter-fill {
  height: 100%;
  width: 100%;
  border-radius: inherit;
  transition: width 160ms ease;
}

.meter-fill.fuel {
  background: linear-gradient(90deg, #65f2ff, #b9ff6a);
}

.meter-fill.distance {
  background: linear-gradient(90deg, #ffd76a, #ff9d4d);
}

#instruction-chip {
  left: 50%;
  bottom: max(18px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  width: min(640px, calc(100vw - 28px));
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  text-align: center;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.72rem;
  backdrop-filter: blur(14px);
}

#overlay {
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: radial-gradient(circle, rgba(101, 242, 255, 0.1), rgba(1, 3, 10, 0.68));
}

#overlay[hidden] {
  display: none;
}

.overlay-card {
  width: min(560px, 100%);
  padding: clamp(24px, 6vw, 44px);
  border: 1px solid rgba(120, 245, 255, 0.28);
  border-radius: 32px;
  background: linear-gradient(160deg, rgba(5, 12, 26, 0.95), rgba(12, 33, 58, 0.86));
  box-shadow: 0 34px 100px rgba(0, 0, 0, 0.48);
  text-align: center;
}

.overlay-card h1 {
  margin: 0;
  font-size: clamp(2.4rem, 8vw, 5rem);
  line-height: 0.94;
}

.overlay-card p {
  color: var(--muted);
  line-height: 1.55;
}

#overlay-action,
.control-btn {
  border: 1px solid rgba(255, 215, 106, 0.4);
  border-radius: 999px;
  background: linear-gradient(135deg, var(--gold), #fff1a8);
  color: #111827;
  font-weight: 800;
  cursor: pointer;
}

#overlay-action {
  min-height: 48px;
  padding: 0 24px;
}

#controls {
  left: max(16px, env(safe-area-inset-left));
  right: max(16px, env(safe-area-inset-right));
  bottom: max(62px, calc(env(safe-area-inset-bottom) + 62px));
  display: flex;
  justify-content: space-between;
  align-items: end;
  pointer-events: none;
}

#controls button,
#action-buttons {
  pointer-events: auto;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
}

.control-pad {
  display: grid;
  gap: 8px;
  pointer-events: auto;
}

.control-pad span {
  color: var(--muted);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.68rem;
}

.control-pad__grid {
  display: grid;
  grid-template-columns: repeat(3, 52px);
  grid-template-areas:
    ". forward ."
    "left up right"
    ". down ."
    ". back .";
  gap: 8px;
}

[data-control="forward"] {
  grid-area: forward;
}

[data-control="up"] {
  grid-area: up;
}

[data-control="left"] {
  grid-area: left;
}

[data-control="down"] {
  grid-area: down;
}

[data-control="right"] {
  grid-area: right;
}

[data-control="back"] {
  grid-area: back;
}

#action-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: end;
  gap: 10px;
  width: min(300px, 46vw);
}

.control-btn {
  min-width: 66px;
  min-height: 48px;
  touch-action: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
}

.control-btn.shoot {
  background: linear-gradient(135deg, #ff7aa6, #ffd76a);
}

.control-btn.small {
  min-height: 40px;
  background: rgba(5, 12, 26, 0.72);
  color: var(--text);
}

@media (max-width: 720px) {
  #menu-toggle {
    top: max(8px, env(safe-area-inset-top));
    right: max(8px, env(safe-area-inset-right));
    min-height: 34px;
    padding: 0 10px;
    font-size: 0.76rem;
  }

  .top-buttons {
    top: max(8px, env(safe-area-inset-top));
    left: max(8px, env(safe-area-inset-left));
    right: 78px;
    width: auto;
    max-width: calc(100vw - 94px);
    margin: 0;
    padding: 0;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 6px;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
  }

  .top-buttons a {
    flex: 0 0 auto;
    width: auto;
    min-height: 34px;
    padding: 8px 10px;
    font-size: 0.82rem;
  }

  .top-buttons a:not(:first-child) {
    display: none;
  }

  body.menu-open .top-buttons {
    top: 50px;
    right: max(8px, env(safe-area-inset-right));
    left: auto;
    width: min(190px, calc(100vw - 16px));
    max-width: min(190px, calc(100vw - 16px));
    padding: 8px;
    flex-direction: column;
    align-items: stretch;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(5, 12, 26, 0.9);
    box-shadow: 0 18px 55px rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(14px);
    z-index: 41;
  }

  body.menu-open .top-buttons a {
    display: inline-flex;
    width: 100%;
  }

  #hud {
    top: 50px;
    left: 8px;
    width: min(250px, calc(100vw - 16px));
    padding: 9px 10px;
    border-radius: 16px;
  }

  .hud-title,
  .hud-item-label,
  .hud-meter-label {
    font-size: 0.56rem;
    letter-spacing: 0.12em;
  }

  .hud-value {
    font-size: 1.25rem;
  }

  .hud-grid {
    display: none;
  }

  .hud-meter {
    margin-top: 7px;
  }

  .meter-track {
    height: 7px;
    margin-top: 5px;
  }

  #instruction-chip {
    display: none;
  }

  #controls {
    bottom: max(18px, env(safe-area-inset-bottom));
  }

  .control-pad__grid {
    grid-template-columns: repeat(3, 44px);
    gap: 6px;
  }

  .control-btn {
    min-width: 46px;
    min-height: 44px;
    padding: 0 8px;
    font-size: 0.76rem;
  }

  #action-buttons {
    width: min(214px, 52vw);
    gap: 6px;
  }
}