:root {
  --ink: #fff6ea;
  --ink-dim: rgba(255, 246, 234, 0.62);
  --amber: #ffb257;
  --ember: #ff6a3d;
  --safe: #8fe3c2;
  --danger: #ff4b3e;
  --panel: rgba(18, 12, 10, 0.62);
  --gap: 6px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: #120b09;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  user-select: none;
}

canvas#game {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  cursor: crosshair;
  outline: none;
}

.hidden { display: none !important; }

/* ---- HUD ----------------------------------------------------------------------------------- */
#hud {
  position: fixed;
  inset: 0;
  pointer-events: none;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.7);
  font-variant-numeric: tabular-nums;
}

#damage, #low-hp {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.35s ease-out;
}

#damage {
  background: radial-gradient(ellipse at center, rgba(120, 0, 0, 0) 45%, rgba(190, 18, 14, 0.85) 100%);
}

#damage.pulse { animation: damagePulse 0.45s ease-out; }

@keyframes damagePulse {
  0% { filter: brightness(1.8); }
  100% { filter: brightness(1); }
}

#low-hp {
  opacity: 0;
  background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0) 40%, rgba(120, 6, 6, 0.75) 100%);
}

#low-hp.on {
  opacity: 1;
  animation: heartbeat 1.1s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% { opacity: 0.45; }
  18% { opacity: 1; }
  36% { opacity: 0.55; }
  52% { opacity: 0.95; }
}

/* Crosshair: four ticks whose gap follows spread (set by --gap). */
.crosshair {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 0;
  height: 0;
  transition: opacity 0.12s ease;
}

.crosshair i {
  position: absolute;
  background: var(--ink);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.35);
  border-radius: 1px;
}

.crosshair i:nth-child(1) { width: 2px; height: 9px; left: -1px; top: calc(var(--gap) * -1 - 9px); }
.crosshair i:nth-child(2) { width: 2px; height: 9px; left: -1px; top: var(--gap); }
.crosshair i:nth-child(3) { width: 9px; height: 2px; top: -1px; left: calc(var(--gap) * -1 - 9px); }
.crosshair i:nth-child(4) { width: 9px; height: 2px; top: -1px; left: var(--gap); }

.crosshair b {
  position: absolute;
  width: 3px;
  height: 3px;
  left: -1.5px;
  top: -1.5px;
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.6);
}

.crosshair.ads { opacity: 0; }

/* ADS: a lens ring and a red dot read as an optic. */
#ads-scope {
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(60vh, 520px);
  height: min(60vh, 520px);
  transform: translate(-50%, -50%);
  border-radius: 50%;
  opacity: 0;
  transition: opacity 0.15s ease;
  background: radial-gradient(circle, rgba(255, 60, 40, 0) 0 1.2%, rgba(255, 60, 40, 0.95) 1.4%, rgba(255, 60, 40, 0) 2.2%);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.4), 0 0 0 999px rgba(0, 0, 0, 0.45);
}

#ads-scope.on { opacity: 1; }

/* Hit marker: an X that flashes white, red for head, gold for plates, bright for kills. */
#hitmarker {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 0;
  height: 0;
  opacity: 0;
}

#hitmarker i {
  position: absolute;
  width: 2px;
  height: 13px;
  background: var(--ink);
  left: -1px;
  top: -6px;
  transform-origin: 50% 50%;
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.5);
}

#hitmarker i:nth-child(1) { transform: rotate(45deg) translateY(-14px); }
#hitmarker i:nth-child(2) { transform: rotate(-45deg) translateY(-14px); }
#hitmarker i:nth-child(3) { transform: rotate(135deg) translateY(-14px); }
#hitmarker i:nth-child(4) { transform: rotate(-135deg) translateY(-14px); }

#hitmarker.show { animation: hitmark 0.22s ease-out; }
#hitmarker.head i { background: #ff5a4a; }
#hitmarker.plate i { background: #ffd36a; }
#hitmarker.kill i { background: #ff3b30; width: 3px; }
#hitmarker.kill.show { animation: hitmark 0.34s ease-out; }

@keyframes hitmark {
  0% { opacity: 0; transform: scale(1.6); }
  25% { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(0.9); }
}

/* Top: wave counter, adrenaline meter. */
#top {
  position: absolute;
  left: 50%;
  top: 22px;
  transform: translateX(-50%);
  text-align: center;
  min-width: 240px;
}

.wave { display: inline-flex; align-items: baseline; gap: 10px; }
.wave .label { font-size: 12px; letter-spacing: 0.32em; color: var(--ink-dim); }
#wave-num { font-size: 34px; font-weight: 800; letter-spacing: 0.02em; }
#wave-sub { font-size: 11px; letter-spacing: 0.22em; color: var(--ink-dim); margin-top: 2px; min-height: 14px; }

.rush {
  margin: 10px auto 0;
  width: 220px;
  height: 4px;
  background: rgba(255, 255, 255, 0.14);
  border-radius: 3px;
  overflow: hidden;
}

#rush-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #ff9a3a, #ff4b3e);
  box-shadow: 0 0 10px rgba(255, 110, 60, 0.7);
  transition: width 0.1s linear;
}

/* Top right: score, kills, feed. */
#top-right {
  position: absolute;
  right: 26px;
  top: 20px;
  text-align: right;
  min-width: 220px;
}

#score { font-size: 26px; font-weight: 800; letter-spacing: 0.02em; }
#kills { font-size: 11px; letter-spacing: 0.24em; color: var(--ink-dim); margin-top: 2px; }
#combo { font-size: 13px; letter-spacing: 0.14em; color: var(--amber); min-height: 18px; margin-top: 4px; font-weight: 700; }

#feed { margin-top: 8px; display: flex; flex-direction: column; align-items: flex-end; gap: 4px; }

.feed-item {
  font-size: 12px;
  letter-spacing: 0.12em;
  padding: 4px 9px;
  background: rgba(10, 6, 6, 0.55);
  border-right: 2px solid var(--amber);
  animation: feedIn 0.22s ease-out;
  transition: opacity 0.45s ease, transform 0.45s ease;
}

.feed-item.head { border-right-color: #ff5a4a; }
.feed-item.out { opacity: 0; transform: translateX(14px); }

@keyframes feedIn {
  from { opacity: 0; transform: translateX(16px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Centre banner. */
#banner {
  position: absolute;
  left: 50%;
  top: 30%;
  transform: translate(-50%, -50%) scale(0.98);
  text-align: center;
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
  pointer-events: none;
  width: min(92vw, 900px);
}

#banner.on { opacity: 1; transform: translate(-50%, -50%) scale(1); }

#banner-title {
  margin: 0;
  font-size: clamp(34px, 6vw, 68px);
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
  text-shadow: 0 4px 22px rgba(0, 0, 0, 0.55), 0 0 26px rgba(255, 150, 70, 0.35);
}

#banner-sub {
  margin: 8px 0 0;
  font-size: 14px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

/* Bottom: health left, ammo right. */
#bottom-left {
  position: absolute;
  left: 26px;
  bottom: 24px;
  width: 260px;
}

.hp {
  height: 8px;
  background: rgba(255, 255, 255, 0.16);
  border-radius: 2px;
  overflow: hidden;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.35);
}

#hp-fill {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, #e33b2f, #ff7a4a);
  transition: width 0.12s linear;
}

.hp-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 8px;
}

#hp-num { font-size: 30px; font-weight: 800; }
#cover-state {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--danger);
  padding: 3px 7px;
  border: 1px solid rgba(255, 75, 62, 0.5);
}
#cover-state.safe { color: var(--safe); border-color: rgba(143, 227, 194, 0.55); }

#bottom-right {
  position: absolute;
  right: 26px;
  bottom: 22px;
  text-align: right;
}

#ammo { display: flex; align-items: baseline; justify-content: flex-end; gap: 10px; }
#ammo-mag { font-size: 58px; font-weight: 900; line-height: 1; letter-spacing: -0.01em; }
#ammo-mag.low { color: #ff8a6a; animation: lowAmmo 0.6s ease-in-out infinite alternate; }
#ammo-res { font-size: 18px; color: var(--ink-dim); font-weight: 700; }
#reload-state { font-size: 12px; letter-spacing: 0.24em; color: var(--amber); height: 14px; margin-top: 4px; }

@keyframes lowAmmo {
  from { opacity: 1; }
  to { opacity: 0.55; }
}

/* ---- Overlays ------------------------------------------------------------------------------ */
.overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: radial-gradient(ellipse at 30% 40%, rgba(12, 6, 4, 0.1) 0%, rgba(12, 6, 4, 0.7) 60%, rgba(8, 4, 3, 0.92) 100%);
  z-index: 10;
}

.panel {
  width: min(560px, 100%);
  padding: 34px 38px 28px;
  background: var(--panel);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid rgba(255, 178, 87, 0.22);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.kicker {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--amber);
}

.panel h1 {
  margin: 0 0 16px;
  font-size: clamp(44px, 9vw, 76px);
  line-height: 0.92;
  font-weight: 900;
  letter-spacing: 0.02em;
  text-shadow: 0 4px 24px rgba(255, 130, 60, 0.25);
}

.lede {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-dim);
}

.btn {
  appearance: none;
  border: 0;
  padding: 14px 28px;
  font: inherit;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #1a0f0b;
  background: linear-gradient(180deg, #ffc27a, #ff9a4a);
  cursor: pointer;
  box-shadow: 0 10px 26px rgba(255, 140, 60, 0.35);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.btn:hover { transform: translateY(-1px); box-shadow: 0 14px 30px rgba(255, 140, 60, 0.45); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

.controls {
  margin: 26px 0 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 22px;
  font-size: 13px;
}

.controls div { display: flex; justify-content: space-between; gap: 10px; border-bottom: 1px solid rgba(255, 255, 255, 0.08); padding-bottom: 6px; }
.controls dt { color: var(--ink-dim); }
.controls dd { margin: 0; font-weight: 700; text-align: right; }

.fine { margin: 18px 0 0; font-size: 12px; color: rgba(255, 246, 234, 0.4); }

.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 22px;
  margin: 0 0 24px;
}

.stats div { display: flex; flex-direction: column; border-left: 2px solid var(--amber); padding-left: 10px; }
.stats span { font-size: 11px; letter-spacing: 0.22em; color: var(--ink-dim); }
.stats b { font-size: 26px; font-weight: 800; }

.boot-error {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  max-width: 90vw;
  padding: 10px 14px;
  background: #3a0d0a;
  color: #ffd6cf;
  font-size: 13px;
  display: none;
}

.boot-error.on { display: block; }

/* Short windows: keep every panel reachable and tighten the spacing. */
.overlay { overflow-y: auto; }

.panel { max-height: 100%; overflow-y: auto; }

@media (max-height: 760px) {
  .overlay { align-items: flex-start; padding-top: 16px; padding-bottom: 16px; }
  .panel { padding: 22px 28px 18px; }
  .panel h1 { font-size: clamp(36px, 8vh, 56px); margin-bottom: 10px; }
  .lede { margin-bottom: 14px; font-size: 14px; line-height: 1.45; }
  .controls { margin-top: 16px; gap: 6px 18px; font-size: 12px; }
  .fine { margin-top: 10px; }
}

@media (max-width: 720px) {
  .controls { grid-template-columns: 1fr; }
  #top-right { right: 14px; top: 12px; min-width: 160px; }
  #bottom-left { left: 14px; width: 200px; bottom: 14px; }
  #bottom-right { right: 14px; bottom: 14px; }
  #ammo-mag { font-size: 44px; }
  .panel { padding: 24px 22px 20px; }
}