/* The HUD, shared by every scenario page. Same night as the main page — every color explicit. */
html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #04060a;
  overflow: hidden;
  overscroll-behavior: none;
}
/* the picture and the readouts both live in the *visible* viewport: on a
   phone 100vh runs on under the browser's own bars, and the clock at the
   bottom goes under with it */
#stage {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  height: 100dvh;
  display: block;
  touch-action: none;
  cursor: grab;
}
#stage.dragging { cursor: grabbing; }
/* the HUD hangs off this, so every corner it names is a corner the phone
   actually shows — inside the notch, the island and the home bar */
#hud-layer {
  position: fixed;
  left: env(safe-area-inset-left, 0px);
  right: env(safe-area-inset-right, 0px);
  top: env(safe-area-inset-top, 0px);
  height: calc(100% - env(safe-area-inset-top, 0px) - env(safe-area-inset-bottom, 0px));
  height: calc(100dvh - env(safe-area-inset-top, 0px) - env(safe-area-inset-bottom, 0px));
  z-index: 2;
  pointer-events: none;
}
.hud {
  position: absolute;
  pointer-events: none;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #66788c;
  user-select: none;
}
.hud strong {
  display: block;
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.3em;
  color: #c2d4e6;
}
.hud button {
  background: none;
  border: none;
  margin: 0;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  padding: 0 0 3px;
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  color: #66788c;
  cursor: pointer;
  border-bottom: 1px solid transparent;
}
.hud button:hover { color: #9db0c4; }
.hud button:focus-visible { outline: 1px solid #66788c; outline-offset: 3px; }
.hud button.on { color: #c2d4e6; border-bottom-color: #c2d4e6; }
.hud button .ic {
  margin-right: 6px;
  font-size: 12px;
  filter: saturate(0.6) brightness(0.9);
}
.hud button.on .ic { filter: none; }
#hud-title { top: 22px; left: 26px; }
#hud-corner {
  top: 22px;
  right: 26px;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 8px;
  pointer-events: auto;
}
#hud-back {
  display: flex;
  align-items: center;
  touch-action: manipulation;
  gap: 9px;
  padding: 8px 14px;
  color: #c2d4e6;
  text-decoration: none;
  background: rgba(8, 12, 18, 0.7);
  border: 1px solid #2a3644;
  border-radius: 4px;
}
#hud-back:hover { border-color: #66788c; color: #ffffff; background: rgba(16, 24, 34, 0.85); }
#hud-controls {
  top: 96px;
  left: 26px;
  display: flex;
  flex-direction: column;
  gap: 13px;
  pointer-events: auto;
}
#hud-scene, #hud-preset, #hud-run { display: flex; gap: 6px 16px; flex-wrap: wrap; align-items: baseline; }
/* a page that rebuilds its presets per view renders them into a span, whose
   buttons then have to be the row's own flex items to take its gap */
#hud-preset-list { display: contents; }
/* The scenarios are a page each, so that row is links rather than buttons —
   wearing the same face as the presets under it. */
#hud-scene a {
  color: #66788c;
  text-decoration: none;
  padding: 0 0 3px;
  border-bottom: 1px solid transparent;
}
#hud-scene a:hover { color: #9db0c4; }
#hud-scene a:focus-visible { outline: 1px solid #66788c; outline-offset: 3px; }
#hud-scene a.on { color: #c2d4e6; border-bottom-color: #c2d4e6; cursor: default; }
#hud-scene a .ic { margin-right: 6px; font-size: 12px; filter: saturate(0.6) brightness(0.9); }
#hud-scene a.on .ic { filter: none; }
#hud-run { gap: 6px 12px; align-items: center; }
#hud-run .sep { color: #3d4a58; }
/* pause and restart are pressed, not read: they are a shape, and a small
   square of one holds a fingertip where a word underlined does not */
.hud .iconbtn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 1px solid #2a3644;
  border-bottom-color: #2a3644;
  border-radius: 4px;
  background: rgba(8, 12, 18, 0.7);
  color: #c2d4e6;
}
.hud .iconbtn:hover { border-color: #66788c; color: #ffffff; background: rgba(16, 24, 34, 0.85); }
.hud .iconbtn svg { display: block; width: 13px; height: 13px; fill: currentColor; }
#hud-src { text-decoration: none; }
#hud-src svg { width: 15px; height: 15px; }
#btn-pause .i-play, #btn-pause.paused .i-pause { display: none; }
#btn-pause.paused .i-play { display: inline; }
#adv-panel {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  width: fit-content;
  box-sizing: border-box;          /* fitPanel() hands it a height; the padding has to live inside it */
  overflow-y: auto;                 /* eleven rows do not fit a phone on its side: fitPanel() caps it and the rest scrolls */
  overscroll-behavior: contain;
  touch-action: pan-y;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: #2a3644 transparent;
  gap: 6px;
  padding: 12px 14px;
  background: rgba(8, 12, 18, 0.78);
  border: 1px solid #22303e;
  border-radius: 4px;
}
#adv-panel[hidden] { display: none; }
#adv-panel::-webkit-scrollbar { width: 5px; }
#adv-panel::-webkit-scrollbar-thumb { background: #2a3644; border-radius: 3px; }
#adv-panel::-webkit-scrollbar-track { background: transparent; }
#adv-panel label {
  display: grid;
  grid-template-columns: 88px 110px 40px;
  align-items: center;
  gap: 9px;
  font-size: 10px;
  letter-spacing: 0.1em;
}
#adv-panel input[type="range"] {
  width: 110px;
  accent-color: #7f9cbb;
  cursor: pointer;
}
#adv-panel input[type="checkbox"] {
  justify-self: start;
  width: 14px;
  height: 14px;
  accent-color: #7f9cbb;
  cursor: pointer;
}
#adv-panel span { text-align: right; color: #9db0c4; font-variant-numeric: tabular-nums; }
#adv-panel .note { margin: 1px 0 2px; padding-top: 6px; border-top: 1px solid #1a2430; font-size: 9px; letter-spacing: 0.08em; color: #3d4a58; text-transform: none; }
/* A readout that moves is a readout nobody can follow. Every row is always
   there — an absent second body says so rather than closing the gap — the
   name, the number and the note each keep a column of their own, and the box
   keeps its width, so between one look and the next only the digits change.
   The widths are in ch: the face is monospace, so a column is a count of
   characters, and letter-spacing is off because it would put the count out. */
#hud-report {
  bottom: 64px;
  right: 26px;
  padding: 10px 12px;
  background: rgba(8, 12, 18, 0.78);
  border: 1px solid #22303e;
  border-radius: 4px;
  font-size: 10px;
  letter-spacing: 0;
  text-transform: none;
  line-height: 1.65;
  color: #9db0c4;
  font-variant-numeric: tabular-nums;
  display: grid;
  grid-template-columns: 9ch 10ch 1fr;
  column-gap: 11px;
  width: 72ch;   /* the longest note the run can produce, measured, and two characters of slack */
  box-sizing: border-box;
}
#hud-report[hidden] { display: none; }
#hud-report b { font-weight: 500; color: #c2d4e6; white-space: nowrap; }
#hud-report .v { text-align: right; color: #c2d4e6; white-space: nowrap; }
#hud-report i { font-style: normal; color: #566574; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }   /* if a note ever outgrows the column, say so rather than cut it off mid-word */
#hud-help { bottom: 20px; left: 26px; }
#hud-stat { bottom: 20px; right: 26px; text-align: right; font-variant-numeric: tabular-nums; }
#hud-stat strong { font-size: 15px; letter-spacing: 0.2em; }
#fallback {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  font-family: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: #8a97a6;
  background: #04060a;
  text-align: center;
  padding: 24px;
}
/* a fingertip is not a cursor: the three-pixel band under a word is not a
   button anyone can hit */
@media (pointer: coarse) {
  .hud button { padding: 6px 0 7px; }
  #adv-panel { background: rgba(6, 9, 14, 0.93); }   /* upright it lies over the planet, and 0.78 was not enough to read through */
  .hud .iconbtn { width: 36px; height: 36px; }
  .hud .iconbtn svg { width: 15px; height: 15px; }
  #hud-src svg { width: 17px; height: 17px; }
  #adv-panel input[type="range"] { height: 26px; }
  #adv-panel input[type="checkbox"] { width: 18px; height: 18px; }
}
/* ---------- a phone held upright ---------- */
@media (max-width: 640px) {
  #hud-help { display: none; }
  #hud-title { top: 14px; left: 16px; }
  #hud-title strong { font-size: 12px; letter-spacing: 0.22em; }   /* the name is long; it has to clear the corner link */
  #hud-corner { top: 14px; right: 16px; }
  #hud-back { padding: 8px 10px; }
  #hud-controls { top: 78px; left: 16px; right: 16px; gap: 10px; }
  .hud { font-size: 12px; }
  #hud-scene, #hud-preset, #hud-run { gap: 4px 14px; }
  #adv-panel { width: auto; max-width: calc(100vw - 64px); }   /* on a phone it spans the column, sliders and all */
  #adv-panel label { grid-template-columns: 88px 1fr 48px; }   /* narrower and "impactor M⊕" folds in two */
  #adv-panel input[type="range"] { width: 100%; }
  #hud-back { display: none; }   /* one corner, one link: the source */
  /* the clock and the run's numbers share a line, pushed to the two edges */
  #hud-stat {
    left: 16px;
    right: 16px;
    bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
  }
  #hud-stat strong { font-size: 13px; letter-spacing: 0.18em; }
  #hud-report {
    bottom: 42px;
    left: 16px;
    right: 16px;
    width: auto;
    grid-template-columns: 8ch 9ch 1fr;
    column-gap: 8px;
    font-size: 9px;
    line-height: 1.6;
  }
}
/* ---------- a phone laid on its side, and any short window ---------- */
/* 390 points of height with the browser's bars inside it: the panel and the
   report give room up rather than run off the bottom */
@media (max-height: 560px) {
  #hud-help { display: none; }
  #hud-title { top: 10px; left: 14px; }
  #hud-title strong { font-size: 12px; letter-spacing: 0.22em; }
  #hud-corner { top: 10px; right: 14px; }
  #hud-back { padding: 6px 10px; }
  #hud-controls {
    top: 54px;
    left: 14px;
    right: auto;
    max-width: min(52vw, 330px);
    gap: 8px;
  }
  #hud-scene, #hud-preset, #hud-run { gap: 2px 14px; }
  .hud button { padding: 4px 0 5px; }   /* every row given back is a row of panel */
  #hud-run { gap: 4px 12px; }
  .hud .iconbtn { width: 32px; height: 32px; }
  #adv-panel {
    width: auto;
    max-width: 100%;
    gap: 4px;
    margin-top: 6px;
    padding: 9px 11px;
  }
  #adv-panel label { grid-template-columns: 88px 1fr 42px; }
  #adv-panel input[type="range"] { width: 100%; }
  #hud-back { display: none; }
  #hud-stat {
    left: 14px;
    right: 14px;
    bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
  }
  #hud-stat strong { font-size: 13px; letter-spacing: 0.18em; }
  #hud-report {
    bottom: 38px;
    right: 14px;
    left: auto;
    width: 44vw;
    grid-template-columns: 8ch 9ch 1fr;
    column-gap: 8px;
    max-height: calc(100dvh - 130px);
    overflow: hidden;
    font-size: 9px;
    line-height: 1.6;
  }
}

/* The loading line: mid-screen, what the thread is busy with — the build,
   with the bar sweeping, or the settle, with the bar its progress. Faded
   once the approach begins. */
#hud-load {
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: #9db0c4;
  text-shadow: 0 0 8px #04060a, 0 0 2px #04060a;   /* it sits over the planet */
  transition: opacity 0.6s;
}
#hud-load.off { opacity: 0; }
#hud-load .bar { position: relative; width: 180px; height: 1px; margin: 10px auto 0; background: #1c2530; overflow: hidden; }
#hud-load .bar i { position: absolute; left: 0; top: 0; height: 100%; width: 0; background: #c2d4e6; transition: width 0.15s linear; }
#hud-load.busy .bar i { width: 40%; animation: hud-sweep 1.2s ease-in-out infinite; }
@keyframes hud-sweep { from { left: -40%; } to { left: 100%; } }