/* ==========================================================================
   Revolver FPS demo — HUD styling.
   Dark, high-contrast instrument panel; nothing here loads an external font
   or image, in keeping with the zero-asset constraint.
   ========================================================================== */

:root {
  --bg:            #07090c;
  --panel:         rgba(10, 13, 17, 0.62);
  --panel-edge:    rgba(150, 176, 210, 0.16);
  --ink:           #e6ecf4;
  --ink-dim:       #93a3b8;
  --ink-faint:     #5f6d80;
  --accent:        #ffb14a;
  --accent-soft:   rgba(255, 177, 74, 0.16);
  --c-live:        #f5b942;
  --c-spent:       #6d5a3c;
  --c-empty:       #37414f;
  --danger:        #ff5c47;
  --ok:            #62d18a;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --r: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

#viewport {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  cursor: crosshair;
}

kbd {
  display: inline-block;
  min-width: 1.35em;
  padding: 1px 5px;
  margin: 0 2px;
  border-radius: 4px;
  border: 1px solid rgba(180, 200, 225, 0.25);
  border-bottom-width: 2px;
  background: rgba(255, 255, 255, 0.06);
  font: 600 10.5px/1.5 var(--mono);
  color: var(--ink);
  letter-spacing: 0.02em;
}

/* ==========================================================================
   HUD frame
   ========================================================================== */

#hud {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 10;
  transition: opacity 220ms ease;
  /* A subtle vignette anchors the overlay to the scene. */
  background:
    radial-gradient(120% 90% at 50% 50%, transparent 52%, rgba(0, 0, 0, 0.45) 100%);
}
#hud.hidden { opacity: 0; }
#hud.paused { filter: saturate(0.5) brightness(0.72); }

.panel {
  position: absolute;
  pointer-events: auto;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: var(--r);
  backdrop-filter: blur(9px) saturate(1.15);
  -webkit-backdrop-filter: blur(9px) saturate(1.15);
  box-shadow: 0 10px 34px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.045);
}

.panel h3 {
  margin: 0 0 8px;
  font: 600 10px/1 var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* ---------- top left: identity + telemetry ---------- */

#topLeft {
  top: 16px; left: 16px;
  padding: 12px 14px 10px;
  min-width: 232px;
}
.title-row { display: flex; align-items: baseline; gap: 10px; }
#topLeft h1 {
  margin: 0;
  font: 700 15px/1 var(--mono);
  letter-spacing: 0.22em;
}
#topLeft h1 .cal {
  margin-left: 6px;
  color: var(--accent);
  letter-spacing: 0.1em;
  font-size: 11px;
}
.badge {
  margin-left: auto;
  padding: 2px 7px;
  border-radius: 20px;
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  font: 700 10px/1.5 var(--mono);
  letter-spacing: 0.08em;
}
.telemetry {
  display: flex;
  gap: 14px;
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}
.tel { display: flex; flex-direction: column; line-height: 1.15; }
.tel b { font: 600 14px/1.15 var(--mono); color: var(--ink); }
.tel b.low { color: var(--danger); }
.tel i { font: 500 9px/1.4 var(--mono); letter-spacing: 0.11em; color: var(--ink-faint); font-style: normal; text-transform: uppercase; }
.assets {
  margin: 9px 0 0;
  font: 400 10px/1.45 var(--sans);
  color: var(--ink-faint);
  max-width: 250px;
}

/* ---------- top right: keybind legend ---------- */

#topRight {
  top: 16px; right: 16px;
  padding: 12px 14px;
  width: 262px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(150, 176, 210, 0.28) transparent;
}
.legend-group + .legend-group { margin-top: 11px; padding-top: 10px; border-top: 1px solid rgba(255, 255, 255, 0.06); }
.legend-group h4 {
  margin: 0 0 6px;
  font: 600 9.5px/1 var(--mono);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0.85;
}
.legend-group dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 10px;
  align-items: center;
}
.legend-group dt { margin: 0; white-space: nowrap; }
.legend-group dd { margin: 0; font: 400 11px/1.35 var(--sans); color: var(--ink-dim); }

/* ---------- bottom left: chamber wheel ---------- */

#bottomLeft {
  bottom: 16px; left: 16px;
  padding: 12px 16px 12px 12px;
  display: flex;
  align-items: center;
  gap: 14px;
}
#wheelHost { width: 132px; height: 132px; flex: none; }
.wheel { width: 132px; height: 132px; display: block; overflow: visible; }

.wheel-bg   { fill: rgba(8, 11, 15, 0.72); }
.wheel-ring { fill: none; stroke: rgba(150, 176, 210, 0.22); stroke-width: 1; }
.wheel-hub  { fill: #232a33; stroke: rgba(160, 180, 205, 0.3); stroke-width: 1; }
.wheel-mark path { fill: var(--accent); }
.wheel-marklabel {
  fill: var(--accent);
  font: 600 7px var(--mono);
  letter-spacing: 0.14em;
  text-anchor: middle;
  opacity: 0.9;
}

.slot-outer { fill: #10151b; stroke: rgba(150, 176, 210, 0.28); stroke-width: 1.2; transition: stroke 140ms ease; }
.slot-inner { fill: var(--c-empty); transition: fill 160ms ease; }
.slot-label { fill: rgba(220, 232, 245, 0.5); font: 600 8px var(--mono); text-anchor: middle; }

.slot.state-live  .slot-inner { fill: var(--c-live); }
.slot.state-live  .slot-label { fill: #2a1e08; }
.slot.state-spent .slot-inner { fill: var(--c-spent); }
.slot.state-spent .slot-label { fill: rgba(255, 240, 215, 0.55); }
.slot.state-empty .slot-inner { fill: transparent; stroke: rgba(120, 140, 165, 0.5); stroke-width: 1.2; stroke-dasharray: 2.4 2.4; }
.slot.current .slot-outer { stroke: var(--accent); stroke-width: 2; }

.ammo { min-width: 118px; }
.count { font: 700 30px/1 var(--mono); letter-spacing: -0.01em; }
.count.dry { color: var(--danger); }
.state {
  margin-top: 5px;
  font: 600 9px/1.4 var(--mono);
  letter-spacing: 0.12em;
  color: var(--ok);
}
.state.warn { color: var(--accent); }
.breakdown {
  list-style: none;
  margin: 10px 0 0;
  padding: 8px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  display: grid;
  gap: 3px;
}
.breakdown li {
  display: flex; align-items: center; gap: 7px;
  font: 400 10.5px/1.5 var(--sans);
  color: var(--ink-dim);
}
.breakdown b { margin-left: auto; font: 600 11px var(--mono); color: var(--ink); }
.breakdown .dot { width: 8px; height: 8px; border-radius: 50%; flex: none; }
.k-live  .dot { background: var(--c-live); }
.k-spent .dot { background: var(--c-spent); }
.k-empty .dot { background: transparent; border: 1.5px dashed rgba(120, 140, 165, 0.75); }

/* ---------- bottom right: interactive controls ---------- */

#bottomRight {
  bottom: 16px; right: 16px;
  padding: 12px 14px;
  width: 262px;
}
.modes { display: grid; gap: 6px; }
.mode-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 7px 10px;
  border-radius: 8px;
  border: 1px solid rgba(150, 176, 210, 0.16);
  background: rgba(255, 255, 255, 0.035);
  color: var(--ink);
  cursor: pointer;
  transition: background 140ms ease, border-color 140ms ease, transform 90ms ease;
  font-family: inherit;
}
.mode-btn b { display: block; font: 600 11.5px/1.3 var(--sans); }
.mode-btn span { display: block; margin-top: 2px; font: 400 9.5px/1.4 var(--sans); color: var(--ink-faint); }
.mode-btn:hover { background: rgba(255, 255, 255, 0.07); border-color: rgba(150, 176, 210, 0.3); }
.mode-btn:active { transform: translateY(1px); }
.mode-btn.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.mode-btn.active b { color: var(--accent); }

.btn-row { display: flex; gap: 6px; margin-top: 6px; }
.act {
  flex: 1;
  padding: 7px 6px;
  border-radius: 8px;
  border: 1px solid rgba(150, 176, 210, 0.16);
  background: rgba(255, 255, 255, 0.035);
  color: var(--ink-dim);
  font: 600 10px/1.2 var(--mono);
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 140ms ease, color 140ms ease, transform 90ms ease;
}
.act:hover { background: rgba(255, 255, 255, 0.08); color: var(--ink); }
.act:active { transform: translateY(1px); }
.act.primary { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.act.primary:hover { background: rgba(255, 177, 74, 0.26); }

#bottomRight h3:nth-of-type(2) { margin-top: 14px; }
#envName { color: var(--ink-dim); letter-spacing: 0.04em; }
.envs { display: flex; gap: 6px; }
.env-btn {
  flex: 1;
  padding: 7px 4px;
  border-radius: 8px;
  border: 1px solid rgba(150, 176, 210, 0.16);
  background: rgba(255, 255, 255, 0.035);
  color: var(--ink-faint);
  font: 600 9.5px/1.2 var(--mono);
  cursor: pointer;
  transition: background 140ms ease, color 140ms ease;
}
.env-btn:hover { background: rgba(255, 255, 255, 0.08); color: var(--ink); }
.env-btn.active { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

/* ---------- centre: crosshair, stage, toast ---------- */

#crosshair {
  position: absolute;
  top: 50%; left: 50%;
  width: 26px; height: 26px;
  transform: translate(-50%, -50%);
  transition: opacity 120ms ease;
}
#crosshair .ch { position: absolute; background: rgba(235, 244, 255, 0.85); box-shadow: 0 0 3px rgba(0, 0, 0, 0.9); }
.ch-t, .ch-b { left: 50%; width: 1.5px; height: 7px; margin-left: -0.75px; }
.ch-l, .ch-r { top: 50%; height: 1.5px; width: 7px; margin-top: -0.75px; }
.ch-t { top: 0; } .ch-b { bottom: 0; } .ch-l { left: 0; } .ch-r { right: 0; }
.ch-dot {
  position: absolute; top: 50%; left: 50%;
  width: 2px; height: 2px; margin: -1px 0 0 -1px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.9);
}

#stageText {
  position: absolute;
  left: 50%;
  bottom: 21%;
  transform: translateX(-50%);
  padding: 6px 16px;
  border-radius: 20px;
  border: 1px solid rgba(255, 177, 74, 0.28);
  background: rgba(12, 15, 20, 0.78);
  color: var(--accent);
  font: 600 11px/1.4 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 160ms ease, transform 160ms ease;
}
#stageText.on { opacity: 1; }

#toast {
  position: absolute;
  left: 50%;
  top: 15%;
  transform: translateX(-50%) translateY(-6px);
  padding: 8px 18px;
  border-radius: 8px;
  border: 1px solid var(--panel-edge);
  background: rgba(10, 13, 17, 0.85);
  backdrop-filter: blur(8px);
  color: var(--ink);
  font: 500 12px/1.4 var(--sans);
  opacity: 0;
  transition: opacity 180ms ease, transform 180ms ease;
}
#toast.on { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ==========================================================================
   Start overlay + boot screen
   ========================================================================== */

#startOverlay {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(70% 70% at 50% 45%, rgba(8, 11, 16, 0.72), rgba(4, 6, 9, 0.94));
  backdrop-filter: blur(3px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 260ms ease;
  cursor: pointer;
}
#startOverlay.on { opacity: 1; pointer-events: auto; }

.start-card {
  max-width: 520px;
  padding: 30px 34px;
  text-align: center;
  border: 1px solid var(--panel-edge);
  border-radius: 14px;
  background: rgba(10, 13, 18, 0.72);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.6);
}
.start-card h2 {
  margin: 0 0 6px;
  font: 700 20px/1.2 var(--mono);
  letter-spacing: 0.14em;
}
.lede { margin: 0 0 18px; color: var(--accent); font: 500 13px/1.5 var(--sans); }
.quickkeys { display: grid; gap: 7px; margin-bottom: 18px; }
.quickkeys div { font: 400 11.5px/1.6 var(--sans); color: var(--ink-dim); }
.foot { margin: 0; font: 400 10.5px/1.5 var(--sans); color: var(--ink-faint); }

#bootScreen {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  transition: opacity 400ms ease, visibility 400ms;
}
#bootScreen.done { opacity: 0; visibility: hidden; }
.boot-inner { text-align: center; }

/* Six chambers filling up while the demo builds itself. */
.boot-cyl {
  position: relative;
  width: 96px; height: 96px;
  margin: 0 auto 20px;
  border: 1px solid rgba(150, 176, 210, 0.22);
  border-radius: 50%;
  animation: bootspin 3.4s linear infinite;
}
.boot-cyl span {
  position: absolute;
  top: 50%; left: 50%;
  width: 17px; height: 17px;
  margin: -8.5px 0 0 -8.5px;
  border-radius: 50%;
  background: rgba(150, 176, 210, 0.18);
  animation: bootpulse 1.5s ease-in-out infinite;
}
.boot-cyl span:nth-child(1) { transform: rotate(0deg)   translateY(-31px); animation-delay: 0s; }
.boot-cyl span:nth-child(2) { transform: rotate(60deg)  translateY(-31px); animation-delay: .15s; }
.boot-cyl span:nth-child(3) { transform: rotate(120deg) translateY(-31px); animation-delay: .30s; }
.boot-cyl span:nth-child(4) { transform: rotate(180deg) translateY(-31px); animation-delay: .45s; }
.boot-cyl span:nth-child(5) { transform: rotate(240deg) translateY(-31px); animation-delay: .60s; }
.boot-cyl span:nth-child(6) { transform: rotate(300deg) translateY(-31px); animation-delay: .75s; }
@keyframes bootspin { to { transform: rotate(360deg); } }
@keyframes bootpulse { 0%, 100% { background: rgba(150, 176, 210, 0.16); } 50% { background: var(--c-live); } }

#bootStatus {
  margin: 0;
  font: 500 11px/1.5 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
#bootStatus.error { color: var(--danger); text-transform: none; letter-spacing: 0; }

.noscript {
  position: fixed; inset: 0; z-index: 90;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg); color: var(--ink);
  font: 500 14px var(--sans);
}

/* ==========================================================================
   Responsive: fold the side panels away on short or narrow viewports.
   ========================================================================== */

@media (max-width: 1180px) {
  #topRight { width: 232px; }
  #bottomRight { width: 232px; }
}
@media (max-width: 900px), (max-height: 620px) {
  #topRight { display: none; }
  #bottomRight { padding: 9px 10px; width: 200px; }
  .mode-btn span { display: none; }
  #topLeft .assets { display: none; }
}
@media (max-width: 620px) {
  #bottomLeft { padding: 8px; gap: 9px; }
  #wheelHost, .wheel { width: 96px; height: 96px; }
  .count { font-size: 22px; }
  .breakdown { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .boot-cyl, .boot-cyl span { animation: none; }
  * { transition-duration: 1ms !important; }
}