/* GARGANTUA — Schwarzschild Black Hole Raytracer
   Spacecraft-terminal UI: hairlines, tracked uppercase, cyan/amber. */

:root{
  --cyan: #7fdcff;
  --cyan-dim: rgba(127,220,255,.45);
  --cyan-hair: rgba(127,220,255,.28);
  --amber: #ffb454;
  --white: #eafaff;
  --mono: ui-monospace,"SF Mono","JetBrains Mono",Menlo,Consolas,monospace;
}

*{ box-sizing: border-box; }
html, body{
  margin: 0; padding: 0;
  width: 100%; height: 100%;
  background: #000;
  overflow: hidden;
  overscroll-behavior: none;
}
body{
  font-family: var(--mono);
  color: var(--white);
  -webkit-font-smoothing: antialiased;
  position: fixed;
  inset: 0;
  touch-action: none;
}

#view{
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: #000;
  touch-action: none;
  z-index: 1;
}

/* ------------------------------------------------------- post decoration -- */
#fx{
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 5;
  background:
    repeating-linear-gradient(0deg,
      rgba(255,255,255,.025) 0px, rgba(255,255,255,.025) 1px,
      transparent 1px, transparent 3px),
    radial-gradient(ellipse at center,
      transparent 0%, transparent 55%, rgba(0,0,0,.55) 100%);
  mix-blend-mode: screen;
  opacity: .6;
}

/* ------------------------------------------------------------------ HUD --- */
#hud{
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 10;
  opacity: 1;
  transition: opacity .6s ease;
}
#hud.off{ opacity: 0; }

.corner{
  position: absolute;
  width: 34px; height: 34px;
  border: 1px solid var(--cyan-hair);
  animation: cornerFlick 6s step-end infinite;
}
.corner.tl{ top: 22px; left: 22px;  border-right: 0; border-bottom: 0; }
.corner.tr{ top: 22px; right: 22px; border-left: 0;  border-bottom: 0; }
.corner.bl{ bottom: 22px; left: 22px;  border-right: 0; border-top: 0; }
.corner.br{ bottom: 22px; right: 22px; border-left: 0;  border-top: 0; }
@keyframes cornerFlick{
  0%, 97%   { opacity: .85; }
  97.5%     { opacity: .28; }
  98%       { opacity: .85; }
  98.6%     { opacity: .45; }
  99%, 100% { opacity: .85; }
}

.title-block{
  position: absolute;
  left: 30px; top: 42px;
}
.title{
  margin: 0;
  font-size: 34px;
  font-weight: 700;
  letter-spacing: .42em;
  color: #fff;
  text-shadow: 0 0 14px rgba(127,220,255,.35);
}
.subtitle{
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: .30em;
  color: var(--amber);
}
.tag{
  margin-top: 5px;
  font-size: 9.5px;
  letter-spacing: .24em;
  color: var(--cyan-dim);
}

.mission{
  position: absolute;
  right: 32px; top: 44px;
  text-align: right;
}
.mission-label{
  font-size: 9px;
  letter-spacing: .3em;
  color: var(--cyan-dim);
}
.mission-clock{
  margin-top: 6px;
  font-size: 17px;
  letter-spacing: .18em;
  color: var(--white);
}

.telemetry{
  position: absolute;
  left: 34px; bottom: 42px;
  font-size: 10.5px;
  line-height: 1.95;
}
.trow{ white-space: nowrap; }
.tlabel{
  display: inline-block;
  width: 190px;
  color: var(--cyan-dim);
  letter-spacing: .14em;
  font-size: 9.5px;
}
.tval{ color: var(--white); letter-spacing: .10em; }

#toast{
  position: absolute;
  top: 84px; left: 50%;
  transform: translateX(-50%);
  font-size: 9.5px;
  letter-spacing: .22em;
  color: var(--amber);
  border: 1px solid rgba(255,180,84,.45);
  background: rgba(8,10,16,.78);
  padding: 7px 14px;
  opacity: 0;
  transition: opacity .3s ease;
  pointer-events: none;
}
#toast.show{ opacity: 1; }

/* ------------------------------------------------------------------ deck -- */
.deck{
  position: absolute;
  right: 30px; bottom: 40px;
  width: 260px;
  padding: 14px 14px 10px;
  pointer-events: auto;
  border: 1px solid var(--cyan-hair);
  background: linear-gradient(135deg, rgba(6,18,32,.82), rgba(4,10,20,.72));
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.deck-title{
  font-size: 9.5px;
  letter-spacing: .30em;
  color: var(--cyan-dim);
  margin-bottom: 10px;
}
.deck .wide{ width: 100%; }
.grid2{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-top: 8px;
}
.grid4{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 5px;
  margin-top: 8px;
}
.deck-hint{
  margin-top: 9px;
  font-size: 8px;
  letter-spacing: .14em;
  color: rgba(127,220,255,.34);
  text-align: center;
}
#btnSound{ margin-top: 8px; }

.btn{
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: #9fd8ee;
  background: transparent;
  border: 1px solid rgba(127,220,255,.30);
  border-radius: 0;
  padding: 8px 4px;
  min-height: 28px;
  cursor: pointer;
  transition: color .15s ease, border-color .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn:hover{
  color: var(--white);
  border-color: var(--cyan);
  box-shadow: 0 0 12px rgba(127,220,255,.25), inset 0 0 8px rgba(127,220,255,.10);
}
.btn.active{
  color: var(--amber);
  border-color: rgba(255,180,84,.8);
  background: rgba(255,180,84,.15);
}
.btn:focus-visible{
  outline: 1px solid var(--cyan);
  outline-offset: 2px;
}

/* ------------------------------------------------------------- hint ------- */
#hint{
  position: absolute;
  bottom: 26px; left: 50%;
  transform: translateX(-50%);
  font-size: 9.5px;
  letter-spacing: .2em;
  color: var(--cyan-dim);
  opacity: 0;
  transition: opacity .8s ease;
  white-space: nowrap;
}
#hint.show{ opacity: .85; }
@media (max-width: 900px){ #hint{ display: none; } }

/* -------------------------------------------------------- params console -- */
#params{
  position: fixed;
  top: 88px; right: 40px;
  width: 284px;
  z-index: 15;
  border: 1px solid rgba(127,220,255,.22);
  background: linear-gradient(160deg, rgba(6,16,30,.82), rgba(5,12,24,.72));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 12px 14px 14px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(127,220,255,.35) transparent;
}
#params.hidden{ display: none; }
#params::-webkit-scrollbar{ width: 5px; }
#params::-webkit-scrollbar-thumb{ background: rgba(127,220,255,.35); }
#params::-webkit-scrollbar-track{ background: transparent; }
.params-head{
  position: sticky;
  top: -12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 9.5px;
  letter-spacing: .30em;
  color: var(--cyan-dim);
  padding: 4px 0 10px;
  background: linear-gradient(160deg, rgba(6,16,30,.95), rgba(5,12,24,.9));
  z-index: 2;
}
.params-head .btn{ padding: 5px 10px; }
.prow{ margin-bottom: 11px; }
.phead{
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 4px;
}
.plabel{
  font-size: 8.5px;
  letter-spacing: .18em;
  color: rgba(159,216,238,.75);
}
.pval{
  font-size: 9px;
  letter-spacing: .08em;
  color: var(--white);
}
.prow input[type="range"]{
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 12px;
  background: transparent;
  cursor: pointer;
  display: block;
}
.prow input[type="range"]::-webkit-slider-runnable-track{
  height: 3px;
  background: rgba(127,220,255,.25);
}
.prow input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance: none;
  appearance: none;
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(127,220,255,.8);
  margin-top: -4px;
  border: 0;
}
.prow input[type="range"]::-moz-range-track{
  height: 3px;
  background: rgba(127,220,255,.25);
}
.prow input[type="range"]::-moz-range-thumb{
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px rgba(127,220,255,.8);
  border: 0;
}
.prow input[type="range"]:focus-visible{
  outline: 1px solid var(--cyan);
  outline-offset: 2px;
}

/* ----------------------------------------------------------------- intro -- */
#intro{
  position: fixed;
  inset: 0;
  z-index: 20;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
}
body.ready #intro{
  opacity: 0;
  pointer-events: none;
  transition: opacity 1.6s ease;
}
.intro-card{
  text-align: center;
  animation: introCard 5.2s ease forwards;
}
@keyframes introCard{
  0%   { opacity: 0; transform: scale(1.06); filter: blur(8px); }
  25%  { opacity: 1; transform: scale(1);    filter: blur(0); }
  80%  { opacity: 1; transform: scale(1);    filter: blur(0); }
  100% { opacity: 0; transform: scale(.99);  filter: blur(0); }
}
.intro-kicker{
  font-size: 10px;
  letter-spacing: .5em;
  color: var(--cyan-dim);
  margin-bottom: 22px;
  padding-left: .5em;
}
.intro-title{
  font-size: clamp(44px, 9vw, 104px);
  font-weight: 700;
  letter-spacing: .36em;
  color: #fff;
  padding-left: .36em;
  text-shadow:
    0 0 18px rgba(127,220,255,.55),
    0 0 46px rgba(127,220,255,.30);
}
.intro-quote{
  margin-top: 26px;
  font-size: 12px;
  font-style: italic;
  letter-spacing: .22em;
  color: rgba(255,180,84,.75);
  padding-left: .22em;
}

/* ----------------------------------------------------------------- fatal -- */
#fatal{
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgba(0,0,0,.88);
  display: flex;
  align-items: center;
  justify-content: center;
}
#fatal[hidden]{ display: none; }
.fatal-card{
  max-width: 420px;
  border: 1px solid rgba(255,180,84,.5);
  background: linear-gradient(160deg, rgba(20,12,6,.9), rgba(8,6,4,.9));
  padding: 26px 30px;
  text-align: center;
}
.fatal-kicker{
  font-size: 9px;
  letter-spacing: .4em;
  color: var(--amber);
  margin-bottom: 12px;
}
.fatal-title{
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .3em;
  color: var(--white);
  margin-bottom: 12px;
}
.fatal-msg{
  font-size: 10.5px;
  line-height: 1.8;
  color: rgba(234,250,255,.75);
  margin-bottom: 18px;
  word-break: break-word;
}
.fatal-actions{
  display: flex;
  gap: 10px;
  justify-content: center;
}
.fatal-actions .btn{ padding: 9px 16px; }

/* ------------------------------------------------------------ responsive -- */
@media (max-width: 720px){
  .corner{ width: 24px; height: 24px; }
  .corner.tl{ top: 10px; left: 10px; }
  .corner.tr{ top: 10px; right: 10px; }
  .corner.bl{ bottom: 10px; left: 10px; }
  .corner.br{ bottom: 10px; right: 10px; }
  .title-block{ left: 18px; top: 20px; }
  .title{ font-size: 22px; }
  .subtitle{ font-size: 8.5px; letter-spacing: .22em; }
  .tag{ font-size: 8px; letter-spacing: .16em; }
  .mission{ right: 16px; top: 22px; }
  .mission-clock{ font-size: 13px; }
  .telemetry{ left: 18px; bottom: 20px; font-size: 9px; line-height: 1.8; }
  .tlabel{ width: 140px; min-width: 140px; font-size: 8px; }
  .deck{ right: 20px; bottom: 20px; width: 210px; padding: 12px 12px 8px; }
  .deck-hint{ display: none; }
  #params{
    right: 10px;
    width: min(284px, calc(100vw - 20px));
  }
  .btn{ min-height: 40px; }
}

/* ------------------------------------------------------ reduced motion ---- */
@media (prefers-reduced-motion: reduce){
  .corner{ animation: none; }
  .intro-card{ animation: introCardStill 1.2s ease forwards; }
  @keyframes introCardStill{
    0%   { opacity: 0; }
    100% { opacity: 1; }
  }
  body.ready #intro{ transition: opacity .6s ease; }
  #hud{ transition: opacity .2s ease; }
}