/* FOREVER:NEON — Book 1 Instrument Kit (shared)
   Reusable chassis/CRT/lamp/meter/knob primitives for the five Book 1
   mission instruments (Sigiltry, Three-Seventeen, Hidden Carrier, The
   Comedy Education, DEAD AIR). ~80% believable 1970-1989 test equipment,
   ~20% impossible FOREVER:NEON behavior riding on top of it.

   Mission pages import this AFTER their own stylesheet's :root token
   block if they need to override an accent, and BEFORE mission-specific
   layout rules so mission CSS can win on specificity where needed. */

:root{
  --fn-chassis-steel:#2a2c2e;
  --fn-chassis-steel-2:#37393b;
  --fn-chassis-beige:#c9c0ab;
  --fn-chassis-charcoal:#1c1d1f;
  --fn-chassis-olive:#4b5240;
  --fn-chassis-navy:#232c3a;
  --fn-chassis-black:#0c0d0e;
  --fn-screw:#55585b;
  --fn-screw-slot:#1a1b1c;

  --fn-crt-glass:#03110d;
  --fn-crt-bg:radial-gradient(circle at 50% 30%,#0a2b22 0,#04140f 55%,#020806 100%);
  --fn-phosphor-cyan:#5dffde;
  --fn-phosphor-amber:#ffb347;
  --fn-phosphor-magenta:#ff5fd1;
  --fn-phosphor-violet:#b98bff;

  --fn-led-red:#ff4b45;
  --fn-led-amber:#ffb347;
  --fn-led-green:#5dffa0;
  --fn-led-off:#3a2c2c;

  --fn-label-paper:#e9e2cf;
  --fn-label-ink:#2a2620;
  --fn-warning-yellow:#e8b93a;
  --fn-warning-black:#1a1712;

  --fn-instrument-radius:10px;
  --fn-instrument-shadow:0 18px 46px rgba(0,0,0,.55), inset 0 1px 0 rgba(255,255,255,.04);
}

/* ---------------------------------------------------------------------
   Chassis / faceplate
--------------------------------------------------------------------- */
.fn-instrument{
  position:relative;
  border-radius:var(--fn-instrument-radius);
  background:
    linear-gradient(180deg,rgba(255,255,255,.05),rgba(0,0,0,.18) 6%,transparent 14%),
    linear-gradient(160deg,var(--fn-chassis-steel-2),var(--fn-chassis-steel) 60%,var(--fn-chassis-charcoal));
  border:1px solid rgba(0,0,0,.6);
  box-shadow:var(--fn-instrument-shadow);
  padding:18px;
}
.fn-instrument + .fn-instrument{margin-top:16px}
.fn-instrument-panel{
  border-radius:8px;
  background:linear-gradient(180deg,rgba(255,255,255,.03),rgba(0,0,0,.22));
  border:1px solid rgba(0,0,0,.5);
  padding:14px;
}
.fn-faceplate{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:14px;
  padding-bottom:10px;
  margin-bottom:12px;
  border-bottom:1px solid rgba(0,0,0,.45);
}
.fn-faceplate h1,.fn-faceplate h2{margin:0}
.fn-faceplate-id{
  font-family:'Share Tech Mono',monospace;
  font-size:10px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:rgba(233,226,207,.55);
}

/* Small hardware screws in chassis corners -- decorative only */
.fn-instrument::before,.fn-instrument::after,
.fn-faceplate::before,.fn-faceplate::after{
  content:"";
  position:absolute;
  width:7px;height:7px;
  border-radius:50%;
  background:radial-gradient(circle at 35% 30%,#8a8d8f,var(--fn-screw) 55%,#222 100%);
  box-shadow:inset 0 0 0 1px var(--fn-screw-slot), 0 1px 1px rgba(0,0,0,.6);
}
.fn-instrument::before{top:8px;left:8px}
.fn-instrument::after{top:8px;right:8px}
.fn-instrument-panel{position:relative}

/* ---------------------------------------------------------------------
   CRT / phosphor display
--------------------------------------------------------------------- */
.fn-crt{
  position:relative;
  border-radius:10px;
  background:linear-gradient(160deg,#302c26,#1c1a17 55%,#0e0d0b);
  border:1px solid rgba(0,0,0,.7);
  box-shadow:
    0 6px 14px rgba(0,0,0,.55),
    inset 0 1px 0 rgba(255,255,255,.06),
    inset 0 0 0 6px #16140f,
    inset 0 0 0 7px rgba(0,0,0,.6);
  overflow:hidden;
  padding:16px;
}
/* bezel mounting screws, top corners of the plastic/metal frame */
.fn-crt::before{
  content:"";
  position:absolute; inset:0;
  background:
    radial-gradient(circle 3px at 12px 12px,#6b6862 0%,#2a2822 70%,transparent 72%),
    radial-gradient(circle 3px at calc(100% - 12px) 12px,#6b6862 0%,#2a2822 70%,transparent 72%);
  pointer-events:none;
}
.fn-crt-glass{
  position:relative;
  border-radius:4px;
  background:var(--fn-crt-bg);
  padding:12px;
  min-height:64px;
  color:var(--fn-phosphor-cyan);
  font-family:'Share Tech Mono',monospace;
  text-shadow:0 0 6px currentColor, 0 0 14px rgba(93,255,222,.35);
  overflow:hidden;
}
/* scanlines */
.fn-crt-glass::before{
  content:"";
  position:absolute; inset:0;
  background:repeating-linear-gradient(to bottom,rgba(0,0,0,.32) 0,rgba(0,0,0,.32) 1px,transparent 1px,transparent 3px);
  pointer-events:none;
  mix-blend-mode:multiply;
}
/* subtle vignette + diagonal glass sheen so the surface reads as
   curved glass, not a flat rectangle */
.fn-crt-glass::after{
  content:"";
  position:absolute; inset:0;
  box-shadow:inset 0 0 26px rgba(0,0,0,.65);
  background:linear-gradient(115deg,rgba(255,255,255,.05) 0%,rgba(255,255,255,.05) 18%,transparent 32%);
  pointer-events:none;
}
.fn-crt-grid{
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(93,255,222,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(93,255,222,.06) 1px,transparent 1px);
  background-size:18px 18px;
  pointer-events:none;
}
.fn-crt-line{
  position:relative;
  white-space:pre-wrap;
  line-height:1.55;
}
.fn-crt-cursor{
  display:inline-block;
  width:.55em; height:1em;
  background:currentColor;
  vertical-align:-2px;
  animation:fn-blink 1s steps(1) infinite;
}

/* ---------------------------------------------------------------------
   Seven-segment style readout
--------------------------------------------------------------------- */
.fn-sevenseg{
  font-family:'VT323',monospace;
  font-size:clamp(28px,5vw,44px);
  letter-spacing:.06em;
  color:var(--fn-phosphor-amber);
  text-shadow:0 0 8px currentColor, 0 0 18px rgba(255,179,71,.4);
}

/* ---------------------------------------------------------------------
   LEDs / status lamps
--------------------------------------------------------------------- */
.fn-led{
  display:inline-block;
  width:10px;height:10px;
  border-radius:50%;
  background:var(--fn-led-off);
  box-shadow:inset 0 0 2px rgba(0,0,0,.8);
  vertical-align:middle;
}
.fn-led--red.is-lit{background:var(--fn-led-red);box-shadow:0 0 8px var(--fn-led-red),0 0 16px rgba(255,75,69,.6),inset 0 0 2px rgba(0,0,0,.4)}
.fn-led--amber.is-lit{background:var(--fn-led-amber);box-shadow:0 0 8px var(--fn-led-amber),0 0 16px rgba(255,179,71,.6),inset 0 0 2px rgba(0,0,0,.4)}
.fn-led--green.is-lit{background:var(--fn-led-green);box-shadow:0 0 8px var(--fn-led-green),0 0 16px rgba(93,255,160,.6),inset 0 0 2px rgba(0,0,0,.4)}

/* ---------------------------------------------------------------------
   Meters / VU bars
--------------------------------------------------------------------- */
.fn-meter{
  border:1px solid rgba(0,0,0,.55);
  background:#060707;
  padding:10px;
  border-radius:6px;
}
.fn-meter-label{
  font-family:'Share Tech Mono',monospace;
  font-size:10px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:rgba(233,226,207,.55);
}
.fn-meter-track{
  display:block;
  height:8px;
  margin-top:7px;
  background:#1b1c1c;
  border-radius:4px;
  overflow:hidden;
}
.fn-meter-fill{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--fn-phosphor-magenta),var(--fn-phosphor-amber),var(--fn-led-green));
  transition:width .35s ease;
}
.fn-vu{display:flex;gap:3px;align-items:flex-end;height:26px}
.fn-vu i{display:block;width:4px;height:30%;background:var(--fn-led-off);border-radius:1px}
.fn-vu.is-active i:nth-child(1){height:45%;background:var(--fn-led-green)}
.fn-vu.is-active i:nth-child(2){height:70%;background:var(--fn-led-green)}
.fn-vu.is-active i:nth-child(3){height:95%;background:var(--fn-led-amber)}
.fn-vu.is-active i:nth-child(4){height:60%;background:var(--fn-led-green)}
.fn-vu.is-active i:nth-child(5){height:35%;background:var(--fn-led-red)}

/* Rotating needle, e.g. inside a small dial face; rotation set inline
   via style="--fn-needle-deg:32deg" from a data attribute, CSS-only. */
.fn-meter-needle{
  position:absolute; left:50%; bottom:8%;
  width:2px; height:38%;
  background:var(--fn-phosphor-amber);
  transform-origin:bottom center;
  transform:translateX(-50%) rotate(var(--fn-needle-deg,-35deg));
  transition:transform .5s cubic-bezier(.2,.8,.3,1);
  box-shadow:0 0 4px rgba(255,179,71,.7);
}

/* ---------------------------------------------------------------------
   Rotary knobs / dials / toggles / keys
   Decorative by default -- do not attach gameplay meaning that isn't
   already present on the underlying control. .fn-dial pairs a real,
   accessible <select> with a knob whose pointer rotation is synced to
   the selected option by book1-instruments.js (wireDials()); the
   select stays the actual control (keyboard/screen-reader operable),
   the knob is a presentation layer on top of it.
--------------------------------------------------------------------- */
.fn-knob{
  position:relative;
  width:52px;height:52px;
  border-radius:50%;
  background:
    radial-gradient(circle at 32% 26%,rgba(255,255,255,.55),rgba(255,255,255,0) 32%),
    conic-gradient(from 200deg,#3a3c3e,#232527 20%,#111 45%,#2c2e30 65%,#3a3c3e 100%),
    radial-gradient(circle at 50% 50%,#4a4c4e,#1a1b1c 70%);
  box-shadow:
    0 3px 6px rgba(0,0,0,.65),
    0 0 0 1px rgba(0,0,0,.7),
    inset 0 1px 1px rgba(255,255,255,.18),
    inset 0 -3px 6px rgba(0,0,0,.6);
  flex:none;
}
/* knurled edge -- repeating conic notches around the rim */
.fn-knob::before{
  content:"";
  position:absolute; inset:0;
  border-radius:50%;
  background:repeating-conic-gradient(rgba(0,0,0,.35) 0deg 3deg,transparent 3deg 9deg);
  mix-blend-mode:multiply;
  -webkit-mask:radial-gradient(circle,transparent 62%,#000 64%);
  mask:radial-gradient(circle,transparent 62%,#000 64%);
}
.fn-knob::after{
  content:"";
  position:absolute; top:8%; left:50%;
  width:3px; height:32%;
  background:linear-gradient(var(--fn-phosphor-cyan),rgba(93,255,222,.4));
  border-radius:2px;
  transform:translateX(-50%) rotate(var(--fn-knob-deg,0deg));
  transform-origin:50% 235%;
  box-shadow:0 0 5px currentColor;
  transition:transform .4s cubic-bezier(.2,.8,.3,1);
}
.fn-dial{
  display:inline-flex;
  flex-direction:column;
  align-items:center;
  gap:6px;
}
.fn-dial-ticks{
  position:relative;
  width:76px;height:38px;
}
.fn-dial-ticks i{
  position:absolute;
  bottom:0; left:50%;
  width:1px;height:6px;
  background:rgba(233,226,207,.35);
  transform-origin:50% 38px;
}
.fn-dial-face{
  position:relative;
  display:grid;
  place-items:center;
}
.fn-knob-scale{
  font-family:'Share Tech Mono',monospace;
  font-size:9px;
  color:rgba(233,226,207,.5);
  letter-spacing:.08em;
  text-align:center;
}
/* The real <select> paired with a dial is kept visually present but
   compact underneath the knob -- native, focusable, screen-reader
   labeled; never display:none, since that would remove it from the
   accessibility tree along with keyboard operability. */
.fn-dial select{
  width:100%;
  font-family:'Share Tech Mono',monospace;
  font-size:11px;
}

/* Toggle switch: chrome bat-handle on a recessed plate */
.fn-toggle{
  --fn-toggle-w:38px; --fn-toggle-h:20px;
  position:relative;
  display:inline-flex;
  width:var(--fn-toggle-w);height:var(--fn-toggle-h);
  border-radius:4px;
  background:linear-gradient(180deg,#0a0a0a,#1c1c1c);
  box-shadow:inset 0 2px 4px rgba(0,0,0,.85), inset 0 0 0 1px rgba(0,0,0,.7), 0 1px 0 rgba(255,255,255,.04);
  align-items:center;
  padding:0 3px;
  flex:none;
}
.fn-toggle::after{
  content:"";
  width:14px;height:calc(var(--fn-toggle-h) - 6px);
  border-radius:3px;
  background:linear-gradient(180deg,#eef0f1,#aeb2b5 45%,#7d8083);
  box-shadow:0 1px 2px rgba(0,0,0,.6), inset 0 1px 0 rgba(255,255,255,.6);
  transform:translateX(0);
  transition:transform .18s ease;
}
.fn-toggle.is-on{background:linear-gradient(180deg,#0a1512,#12211c)}
.fn-toggle.is-on::after{
  transform:translateX(calc(var(--fn-toggle-w) - 20px));
  background:linear-gradient(180deg,#c8ffef,#5dffde 45%,#2fb99a);
  box-shadow:0 1px 2px rgba(0,0,0,.6), inset 0 1px 0 rgba(255,255,255,.6), 0 0 8px rgba(93,255,222,.5);
}

/* Pushbutton / key -- tactile depth, presses down on click */
.fn-key,.fn-function-key{
  font-family:'Share Tech Mono',monospace;
  letter-spacing:.06em;
  text-transform:uppercase;
}
.fn-key{
  position:relative;
  box-shadow:
    0 3px 0 rgba(0,0,0,.55),
    0 4px 6px rgba(0,0,0,.4),
    inset 0 1px 0 rgba(255,255,255,.08);
  transition:transform .08s ease, box-shadow .08s ease;
}
.fn-key:active{
  transform:translateY(2px);
  box-shadow:0 1px 0 rgba(0,0,0,.55), 0 1px 2px rgba(0,0,0,.4), inset 0 1px 0 rgba(255,255,255,.05);
}

/* ---------------------------------------------------------------------
   Connectors
--------------------------------------------------------------------- */
.fn-bnc,.fn-jack{
  display:inline-block;
  width:16px;height:16px;
  border-radius:50%;
  background:radial-gradient(circle at 35% 30%,#9a9c9e,#4a4c4e 55%,#151616 100%);
  box-shadow:inset 0 0 0 2px #0c0d0e;
  vertical-align:middle;
}
.fn-bnc.is-active,.fn-jack.is-active{box-shadow:inset 0 0 0 2px #0c0d0e,0 0 8px var(--fn-phosphor-cyan)}

/* ---------------------------------------------------------------------
   Labels
--------------------------------------------------------------------- */
.fn-paper-label{
  display:inline-block;
  background:var(--fn-label-paper);
  color:var(--fn-label-ink);
  font-family:'Share Tech Mono',monospace;
  font-size:10px;
  letter-spacing:.08em;
  text-transform:uppercase;
  padding:3px 7px;
  border-radius:2px;
  box-shadow:0 1px 2px rgba(0,0,0,.4);
  transform:rotate(-.6deg);
}
.fn-warning-label{
  display:inline-flex;
  align-items:center;
  gap:6px;
  background:repeating-linear-gradient(45deg,var(--fn-warning-yellow) 0 8px,var(--fn-warning-black) 8px 16px);
  color:var(--fn-warning-black);
  font-family:'Share Tech Mono',monospace;
  font-size:10px;
  font-weight:700;
  letter-spacing:.06em;
  text-transform:uppercase;
  padding:4px 8px;
  border-radius:2px;
}
.fn-warning-label span{background:var(--fn-label-paper);padding:1px 5px;border-radius:1px}

/* ---------------------------------------------------------------------
   Tape transport (Comedy Education / DEAD AIR)
--------------------------------------------------------------------- */
.fn-tape-deck{
  display:flex; align-items:center; gap:10px;
  border:1px solid rgba(0,0,0,.5);
  background:#0b0b0a;
  padding:10px;
  border-radius:6px;
}
.fn-tape-counter{
  font-family:'VT323',monospace;
  font-size:22px;
  color:var(--fn-phosphor-amber);
  background:#050404;
  border:1px solid rgba(0,0,0,.6);
  border-radius:3px;
  padding:2px 8px;
  min-width:64px;
  text-align:center;
  text-shadow:0 0 6px currentColor;
}

/* ---------------------------------------------------------------------
   Scope / waveform / spectrum
--------------------------------------------------------------------- */
.fn-scope{position:relative;border-radius:6px;overflow:hidden}
.fn-waveform,.fn-spectrum{width:100%;display:block}
.fn-waveform path,.fn-spectrum rect{stroke:var(--fn-phosphor-cyan);fill:none}

@keyframes fn-scanmove{
  0%{transform:translateY(-6%)}
  50%{transform:translateY(6%)}
  100%{transform:translateY(-6%)}
}
.fn-scope-drift{animation:fn-scanmove 9s ease-in-out infinite}

/* ---------------------------------------------------------------------
   Slots / cartridges / evidence
--------------------------------------------------------------------- */
.fn-slot{
  border:1px dashed rgba(233,226,207,.28);
  border-radius:6px;
  background:rgba(0,0,0,.25);
  transition:border-color .2s ease, box-shadow .2s ease, background .2s ease;
}
.fn-slot.is-filled,.fn-slot[data-filled="true"]{
  border-style:solid;
  border-color:var(--fn-phosphor-cyan);
  box-shadow:0 0 16px rgba(93,255,222,.14);
  background:rgba(93,255,222,.05);
}
.fn-cartridge{
  border:1px solid rgba(0,0,0,.55);
  background:linear-gradient(180deg,#2b2b29,#141412);
  border-radius:4px;
}

/* ---------------------------------------------------------------------
   Result / status strips
--------------------------------------------------------------------- */
.fn-result-strip,.fn-status-line{
  font-family:'Share Tech Mono',monospace;
  font-size:11px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:rgba(233,226,207,.7);
}
.fn-calibration-mark{
  display:inline-block;
  width:1px;height:6px;
  background:rgba(233,226,207,.3);
}

/* ---------------------------------------------------------------------
   Ward symbol sizing helper (used with <use href="...book1-ward-symbols.svg#fn-ward-*">)
--------------------------------------------------------------------- */
.fn-ward-symbol{width:1em;height:1em;display:inline-block;vertical-align:-.12em}

/* ---------------------------------------------------------------------
   Anomaly / FOREVER:NEON intrusion states -- the 20% impossible layer.
   Applied via a shared `.fn-anomaly` modifier class so any instrument
   surface can briefly register "something is wrong with the equipment."
--------------------------------------------------------------------- */
@keyframes fn-anomaly-flicker{
  0%,92%,100%{opacity:1;filter:none}
  93%{opacity:.85;filter:hue-rotate(8deg)}
  94%{opacity:1;filter:none}
  96%{opacity:.9;filter:hue-rotate(-6deg) saturate(1.3)}
  97%{opacity:1;filter:none}
}
.fn-anomaly{animation:fn-anomaly-flicker 7s linear infinite}

/* One-shot anomaly: a reading that flares and takes noticeably longer
   than usual to settle back down. See book1-instruments.js
   wirePersistGlow(). */
@keyframes fn-anomaly-linger{
  0%{filter:brightness(1)}
  35%{filter:brightness(1.22)}
  100%{filter:brightness(1)}
}
.fn-anomaly-linger{animation:fn-anomaly-linger 3.6s ease-out}

/* One-shot anomaly: the instant a display shows an impossible value
   before snapping back. See book1-instruments.js wireFlickerGlitch(). */
.fn-anomaly-flicker-text{color:var(--fn-phosphor-magenta,#ff5fd1)}

/* Phosphor burn-in: text that never fully lets go, fading to a faint
   permanent ghost instead of disappearing. Opt-in via class
   .fn-anomaly-burn on any element -- typically a .fn-crt-line. */
@keyframes fn-anomaly-burn{
  0%,55%{opacity:1}
  100%{opacity:.14}
}
.fn-anomaly-burn{animation:fn-anomaly-burn 12s ease-out forwards}

@keyframes fn-blink{50%{opacity:0}}

/* ---------------------------------------------------------------------
   Accessibility
--------------------------------------------------------------------- */
.fn-visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}
@media (prefers-reduced-motion:reduce){
  .fn-anomaly,.fn-crt-cursor,.fn-scope-drift,.fn-anomaly-linger{animation:none!important}
  .fn-meter-needle,.fn-meter-fill,.fn-toggle::after,.fn-knob::after{transition:none!important}
  .fn-anomaly-burn{animation:none!important;opacity:.14}
}