/* ============================================================================
   flight-sim — HUD + UI stylesheet (integrator-owned).
   ----------------------------------------------------------------------------
   CONTRACT for src/instruments.js (see README / INTEGRATOR_NOTES):
   createInstruments(rootEl) creates ALL overlay DOM inside #hud using exactly
   the class names below. No inline styles except dynamic transforms set per
   frame (pitch/roll of the horizon, tape translations, bar widths, lamp glow).
   Conventions:
     .hud-debug   — hidden by default (display:none); add .visible to show it.
                    instruments.debug(lines|null): null hides, array shows.
     .hud-message — hidden by default; message(text, kind) sets text + kind
                    class (.info | .warn | .crash) + visible; clearMessage()
                    removes visible.  autoHideMessageMs is applied by main.js.
     .lamp        — off-state lamp; add .on to light it.
     .hud-stall   — warning card; add .on (flashes) while data.stall is true.
   ========================================================================== */

:root {
  color-scheme: dark;
  --hud-bg: rgba(8, 14, 22, 0.55);
  --hud-edge: rgba(120, 190, 255, 0.18);
  --hud-text: #cfe6ff;
  --hud-dim: #7fa6cf;
  --hud-amber: #ffb347;
  --hud-green: #7dff9e;
  --hud-red: #ff5a5a;
  --hud-cyan: #86f4ff;
  --font-mono: 'Consolas', 'Menlo', 'DejaVu Sans Mono', 'Courier New', monospace;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #05070c;
}

body {
  font-family: var(--font-mono);
  color: var(--hud-text);
  -webkit-user-select: none;
  user-select: none;
}

/* ---- 3D canvas ----------------------------------------------------------- */

#sim {
  position: fixed;
  inset: 0;
  display: block;
  width: 100vw;
  height: 100vh;
  cursor: crosshair;
  outline: none;
  touch-action: none;
}

/* ---- HUD root -------------------------------------------------------------
   instruments.js mounts every panel into #hud. pointer-events:none so clicks
   reach the canvas (orbit-camera drag). */

#hud {
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--hud-text);
  letter-spacing: 0.5px;
}

/* Generic glassy panel look used by every instrument block. */
.hud-attitude, .hud-airspeed, .hud-altitude, .hud-heading, .hud-engine,
.hud-lamps, .hud-debug, .hud-message, .hud-stall {
  position: absolute;
  background: var(--hud-bg);
  border: 1px solid var(--hud-edge);
  border-radius: 8px;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  text-shadow: 0 0 6px rgba(90, 160, 255, 0.45);
}

/* Big numeric readouts (airspeed / altitude current value). */
.hud-num {
  font-size: 26px;
  font-weight: 700;
  color: #fff;
  text-align: center;
  line-height: 1.05;
}

.hud-num small {
  display: block;
  font-size: 10px;
  font-weight: 400;
  color: var(--hud-dim);
  letter-spacing: 1px;
}

/* Generic tape (moving scale strip). The module translates it per frame. */
.tape {
  position: relative;
  overflow: hidden;
  background: rgba(6, 10, 16, 0.55);
  border: 1px solid rgba(120, 190, 255, 0.14);
  border-radius: 4px;
}

.tape .tick {
  position: absolute;
  color: var(--hud-dim);
  font-size: 10px;
  white-space: nowrap;
}

/* ---- attitude indicator (left column, above the airspeed tape) ---------- */
/* The AI and airspeed panel share one flex column, vertically centered on
   the left edge, so the middle of the screen stays clear for flying. */

.hud-left-col {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.hud-attitude {
  position: relative;
  width: 210px;
  height: 210px;
  border-radius: 50%;
  overflow: hidden;
  background: rgba(6, 10, 16, 0.45);
}

.ai-horizon {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 340px;
  height: 340px;
  margin: -170px 0 0 -170px;
  /* instrument sets: translateY(pitchPx) rotate(-bankDeg) */
  will-change: transform;
}

.ai-sky {
  position: absolute;
  inset: 0 0 50% 0;
  background: linear-gradient(180deg, #2b6fb3, #7fb2d8);
}

.ai-ground {
  position: absolute;
  inset: 50% 0 0 0;
  background: linear-gradient(180deg, #8a6a3c, #b08a52);
}

.ai-line {
  position: absolute;
  left: 8px;
  right: 8px;
  height: 2px;
  background: rgba(255, 255, 255, 0.75);
}

.ai-fixed {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 120px;
  height: 90px;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.ai-symbol {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 86px;
  height: 14px;
  transform: translate(-50%, -50%);
  border: 2px solid var(--hud-amber);
  border-radius: 3px;
}

.ai-symbol::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  width: 10px;
  height: 10px;
  transform: translate(-50%, -50%);
  background: var(--hud-amber);
  border-radius: 50%;
}

/* ---- airspeed tape (left) ------------------------------------------------ */

.hud-airspeed {
  position: relative;
  width: 92px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.hud-airspeed .tape {
  width: 64px;
  height: 220px;
}

.hud-airspeed .tick {
  left: 0;
  right: 0;
  text-align: center;
}

/* ---- altitude + vertical speed (right) ----------------------------------- */

.hud-altitude {
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 116px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.hud-altitude .tape {
  width: 84px;
  height: 220px;
}

.hud-altitude .tick {
  left: 0;
  right: 0;
  text-align: center;
}

.hud-vsi {
  position: absolute;
  right: -34px;
  top: 8px;
  bottom: 8px;
  width: 26px;
  border: 1px solid rgba(120, 190, 255, 0.25);
  border-radius: 4px;
  background: rgba(6, 10, 16, 0.5);
  overflow: hidden;
}

.hud-vsi-fill {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--hud-cyan);
  /* module sets top/bottom of a zero-bar span; simplest: a centered bar
     that the module scales: transform: translateY via per-frame inline */
  box-shadow: 0 0 8px var(--hud-cyan);
}

/* ---- heading tape (bottom center) ---------------------------------------- */

.hud-heading {
  bottom: 64px;
  left: 50%;
  transform: translateX(-50%);
  width: 330px;
  padding: 8px 10px;
}

.hud-heading .tape {
  width: 100%;
  height: 34px;
}

.hud-heading .tick {
  bottom: 2px;
  text-align: center;
}

.hud-heading .tick.major {
  color: #fff;
  font-weight: 700;
}

.hud-heading .bug {
  position: absolute;
  left: 50%;
  top: -4px;
  width: 0;
  height: 0;
  border-left: 7px solid transparent;
  border-right: 7px solid transparent;
  border-top: 10px solid var(--hud-amber);
  transform: translateX(-50%);
}

/* ---- engine panel (bottom left) ------------------------------------------ */

.hud-engine {
  left: 18px;
  bottom: 18px;
  width: 190px;
  padding: 10px 12px;
}

.hud-engine .bar-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 5px 0;
  font-size: 11px;
  color: var(--hud-dim);
}

.hud-engine .bar {
  position: relative;
  flex: 1;
  height: 10px;
  background: rgba(6, 10, 16, 0.7);
  border: 1px solid rgba(120, 190, 255, 0.18);
  border-radius: 3px;
  overflow: hidden;
}

.hud-engine .bar-fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0%;
  background: linear-gradient(90deg, var(--hud-green), var(--hud-amber));
}

.hud-engine .bar-fill.throttle {
  background: linear-gradient(90deg, var(--hud-cyan), #4aa8ff);
}

/* ---- lamps (bottom right) ------------------------------------------------- */

.hud-lamps {
  right: 18px;
  bottom: 18px;
  display: flex;
  gap: 8px;
  padding: 8px 10px;
}

.lamp {
  padding: 4px 9px;
  border-radius: 4px;
  border: 1px solid rgba(120, 190, 255, 0.22);
  background: rgba(6, 10, 16, 0.6);
  color: var(--hud-dim);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: background 0.15s, color 0.15s, box-shadow 0.15s;
}

.lamp.on {
  color: #06121c;
  background: var(--hud-green);
  box-shadow: 0 0 10px rgba(125, 255, 158, 0.8);
}

.lamp--gear.on {
  background: var(--hud-amber);
  color: #241500;
  box-shadow: 0 0 10px rgba(255, 179, 71, 0.8);
}

.lamp--brakes.on {
  background: var(--hud-red);
  color: #2a0606;
  box-shadow: 0 0 10px rgba(255, 90, 90, 0.8);
}

.lamp--stall.on {
  background: var(--hud-red);
  color: #2a0606;
  animation: stall-flash 0.45s steps(2, jump-none) infinite;
}

/* ---- stall warning (center, flashing) ------------------------------------- */

.hud-stall {
  display: none;
  left: 50%;
  top: 26%;
  transform: translateX(-50%);
  padding: 10px 26px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--hud-red);
  border-color: var(--hud-red);
  text-shadow: 0 0 12px rgba(255, 90, 90, 0.9);
}

.hud-stall.on {
  display: block;
  animation: stall-flash 0.45s steps(2, jump-none) infinite;
}

/* ---- message banner (top center) ----------------------------------------- */

.hud-message {
  display: none;
  top: 26px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 30px;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 3px;
  border-width: 2px;
  background: rgba(8, 14, 22, 0.72);
  animation: msg-in 0.25s ease-out;
}

.hud-message.visible { display: block; }

.hud-message.info {
  color: var(--hud-green);
  border-color: rgba(125, 255, 158, 0.6);
  text-shadow: 0 0 14px rgba(125, 255, 158, 0.7);
}

.hud-message.warn {
  color: var(--hud-amber);
  border-color: rgba(255, 179, 71, 0.6);
  text-shadow: 0 0 14px rgba(255, 179, 71, 0.7);
}

.hud-message.crash {
  color: #fff;
  border-color: var(--hud-red);
  background: rgba(120, 12, 12, 0.62);
  text-shadow: 0 0 16px rgba(255, 90, 90, 0.95);
  animation: msg-in 0.25s ease-out, crash-pulse 0.6s ease-in-out 2;
}

/* ---- debug panel (top left) ---------------------------------------------- */

.hud-debug {
  display: none;
  top: 18px;
  left: 18px;
  min-width: 210px;
  padding: 10px 12px;
  font-size: 11px;
  line-height: 1.7;
  color: var(--hud-cyan);
}

.hud-debug.visible { display: block; }

.hud-debug .line b {
  color: #fff;
  font-weight: 700;
}

.hud-debug .line.pair b::after {
  content: ' ';
}

/* ---- start overlay --------------------------------------------------------- */

#start-overlay {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background:
    radial-gradient(1200px 700px at 50% 30%, rgba(30, 60, 110, 0.35), transparent 70%),
    rgba(3, 6, 12, 0.66);
}

#start-overlay.hidden { display: none; }

.start-card {
  width: min(620px, 92vw);
  max-height: 92vh;
  overflow-y: auto;
  padding: 34px 42px 30px;
  text-align: center;
  background: rgba(9, 15, 24, 0.85);
  border: 1px solid rgba(140, 200, 255, 0.25);
  border-radius: 14px;
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.start-title {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: 12px;
  color: #eaf4ff;
  text-shadow: 0 0 24px rgba(90, 170, 255, 0.6);
  margin-bottom: 8px;
}

.start-sub {
  font-size: 12px;
  color: var(--hud-dim);
  line-height: 1.6;
  margin-bottom: 18px;
}

.start-controls {
  width: 100%;
  border-collapse: collapse;
  margin: 0 auto 22px;
  font-size: 12px;
}

.start-controls th {
  color: var(--hud-cyan);
  font-weight: 700;
  text-align: left;
  padding: 5px 12px;
  border-bottom: 1px solid rgba(140, 200, 255, 0.3);
  letter-spacing: 2px;
}

.start-controls td {
  padding: 4px 12px;
  text-align: left;
  border-bottom: 1px solid rgba(140, 200, 255, 0.09);
}

.start-controls td:first-child {
  color: #fff;
  font-weight: 700;
  white-space: nowrap;
  width: 34%;
}

#start-btn {
  display: inline-block;
  padding: 14px 46px;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 4px;
  color: #04101c;
  background: linear-gradient(180deg, #9fe0ff, #4aa8ff);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  box-shadow: 0 0 24px rgba(74, 168, 255, 0.55);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

#start-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 34px rgba(74, 168, 255, 0.85);
}

#start-btn:active {
  transform: translateY(0);
}

/* ---- animations ------------------------------------------------------------ */

@keyframes stall-flash {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.12; }
}

@keyframes msg-in {
  from { transform: translate(-50%, -14px); opacity: 0; }
  to   { transform: translate(-50%, 0);    opacity: 1; }
}

@keyframes crash-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 90, 90, 0); }
  50%      { box-shadow: 0 0 26px 4px rgba(255, 90, 90, 0.55); }
}