/* ============================================================================
   BASE — reset, stage scaling, background layers, shared utilities
   ============================================================================ */

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

html,body{ height:100%; }

body{
  font-family:var(--font-ui);
  color:var(--white);
  background:#04060F;
  overflow:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  user-select:none;
  -webkit-tap-highlight-color:transparent;
  cursor:default;
}

img{ display:block; max-width:100%; }
button{ font-family:inherit; color:inherit; cursor:pointer; border:none; background:none; }

/* ---- App + Stage --------------------------------------------------------- */
#app{
  position:fixed; inset:0;
  display:grid; place-items:center;
  background:var(--grad-bg);
}

/* The fixed 1920x1080 canvas. JS scales it to fit any display (16:9 locked). */
#stage{
  position:relative;
  width:var(--stage-w);
  height:var(--stage-h);
  transform-origin:center center;
  overflow:hidden;
  background:var(--grad-bg);
  box-shadow:0 0 120px rgba(0,0,0,.6);
  isolation:isolate;
}

/* ---- Background layers ---------------------------------------------------- */
#particles{
  position:absolute; inset:0;
  width:100%; height:100%;
  z-index:var(--z-particles);
  pointer-events:none;
}

#bg-grid{
  position:absolute; inset:-2%;
  z-index:var(--z-grid);
  pointer-events:none;
  background-image:
    linear-gradient(rgba(120,160,240,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120,160,240,.06) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(120% 100% at 50% 40%, #000 35%, transparent 80%);
  -webkit-mask-image:radial-gradient(120% 100% at 50% 40%, #000 35%, transparent 80%);
  animation:gridDrift 40s linear infinite;
}

#bg-vignette{
  position:absolute; inset:0;
  z-index:var(--z-vignette);
  pointer-events:none;
  background:
    radial-gradient(120% 90% at 50% 30%, transparent 55%, rgba(2,4,10,.55) 100%),
    radial-gradient(80% 60% at 50% 120%, rgba(43,92,230,.10), transparent 60%);
}

/* faint engineering corner brackets for an instrument-panel feel */
#stage::before,#stage::after{
  content:""; position:absolute; width:120px; height:120px; z-index:var(--z-vignette);
  border:var(--hairline) solid rgba(228,197,107,.18); pointer-events:none;
}
#stage::before{ top:46px; left:46px; border-right:none; border-bottom:none; }
#stage::after{ bottom:46px; right:46px; border-left:none; border-top:none; }

/* ---- Screens layer ------------------------------------------------------- */
#screens{ position:absolute; inset:0; z-index:var(--z-screens); }

.screen{
  position:absolute; inset:0;
  display:none;
  padding:96px 120px;
  opacity:0;
}
.screen.is-active{ display:grid; }
.screen.is-enter{ animation:screenIn .9s cubic-bezier(.16,.84,.34,1) both; }
.screen.is-exit{ animation:screenOut .6s ease both; }

/* full-bleed centred default layout for most screens */
.screen{ place-items:center; align-content:center; text-align:center; }

/* ---- Confetti overlay ---------------------------------------------------- */
#confetti{
  position:absolute; inset:0; width:100%; height:100%;
  z-index:var(--z-confetti); pointer-events:none;
}

/* ---- Progress rail ------------------------------------------------------- */
#progress-rail{
  position:absolute; left:0; top:0; height:3px; width:100%;
  z-index:var(--z-progress);
  background:rgba(255,255,255,.06);
}
#progress-fill{
  height:100%; width:0%;
  background:var(--grad-gold);
  box-shadow:0 0 16px var(--gold-glow);
  transition:width .4s ease;
}

/* ---- Hint ---------------------------------------------------------------- */
#hint{
  position:absolute; left:50%; bottom:34px; transform:translateX(-50%);
  z-index:var(--z-hint);
  font-size:15px; letter-spacing:.28em; text-transform:uppercase;
  color:var(--muted); opacity:.0;
  transition:opacity .6s ease;
}
#hint.show{ opacity:.7; animation:hintPulse 3.2s ease-in-out infinite; }

/* ---- Controls ------------------------------------------------------------ */
#controls{
  position:absolute; right:34px; bottom:30px;
  z-index:var(--z-controls);
  display:flex; gap:12px; align-items:center;
  opacity:.0; transition:opacity .4s ease;
}
#controls.show{ opacity:.42; }
#controls:hover{ opacity:1; }
.ctrl-btn{
  width:46px; height:46px; border-radius:50%;
  display:grid; place-items:center;
  background:var(--glass-bg-2);
  border:var(--hairline) solid var(--glass-brd-2);
  backdrop-filter:blur(10px); -webkit-backdrop-filter:blur(10px);
  color:var(--white-2); font-size:18px; line-height:1;
  transition:transform .2s ease, border-color .2s ease, color .2s ease;
}
.ctrl-btn:hover{ transform:translateY(-2px); border-color:var(--glass-brd); color:var(--gold-hi); }
.ctrl-btn:active{ transform:translateY(0) scale(.94); }

/* ---- Utilities ----------------------------------------------------------- */
.gold-text{
  background:var(--grad-gold);
  -webkit-background-clip:text; background-clip:text;
  color:transparent;
  text-shadow:0 1px 0 rgba(0,0,0,.25);
}
.kicker{
  font-size:18px; letter-spacing:.42em; text-transform:uppercase;
  color:var(--gold-3); font-weight:600;
}
.eyebrow-line{
  width:120px; height:2px; margin:22px auto;
  background:var(--grad-gold); border-radius:2px;
  box-shadow:0 0 18px var(--gold-glow);
}
.sr-only{ position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); }

/* ---- Reduced motion ------------------------------------------------------ */
.reduce-motion #bg-grid,
.reduce-motion #hint.show{ animation:none; }
.reduce-motion .screen.is-enter{ animation:fadeIn .5s ease both; }
.reduce-motion .screen.is-exit{ animation:fadeOut .3s ease both; }

@media (prefers-reduced-motion:reduce){
  #bg-grid{ animation:none; }
}