/* ===========================================================================
   GARGANTUA — interface
   Cinematic instrument-panel aesthetic: hairlines, monospace telemetry,
   amber (accretion) + cyan (instrument) accents on true black.
   =========================================================================== */

:root {
  --bg:        #000000;
  --amber:     #ffab52;
  --amber-dim: #b06a24;
  --cyan:      #6fd8ff;
  --cyan-dim:  #2b6b83;
  --ink:       #e8eef2;
  --ink-dim:   #8b9aa4;
  --line:      rgba(140, 190, 210, 0.16);
  --line-hot:  rgba(255, 171, 82, 0.34);
  --glass:     rgba(6, 10, 14, 0.62);
  --glass-2:   rgba(8, 12, 16, 0.80);
  --mono: "SFMono-Regular", "JetBrains Mono", "Cascadia Mono", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0; height: 100%; width: 100%;
  background: var(--bg); color: var(--ink);
  font-family: var(--sans);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

#gl {
  position: fixed; inset: 0;
  width: 100vw; height: 100vh;
  display: block; z-index: 0;
  touch-action: none;
}

/* ------------------------------------------------------------- overlays -- */
.overlay {
  position: fixed; inset: 0; z-index: 90;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(ellipse at center, #05070a 0%, #000 70%);
  transition: opacity .7s ease, visibility .7s;
}
.overlay.hidden { opacity: 0; visibility: hidden; pointer-events: none; }

.boot-inner { text-align: center; padding: 24px; max-width: 560px; }
.boot-title {
  font-family: var(--mono); font-size: clamp(28px, 6vw, 54px);
  letter-spacing: .42em; margin-right: -.42em;
  color: var(--amber);
  text-shadow: 0 0 34px rgba(255, 150, 50, .45);
}
.boot-title.err  { color: #ff6b5a; text-shadow: 0 0 30px rgba(255,80,60,.4); }
.boot-title.warn { color: var(--cyan); text-shadow: 0 0 30px rgba(80,200,255,.35); }
.boot-sub {
  margin-top: 14px; font-family: var(--mono); font-size: 11px;
  letter-spacing: .3em; color: var(--ink-dim);
}
.boot-hint { margin-top: 18px; font-size: 13px; line-height: 1.7; color: var(--ink-dim); }
.boot-bar {
  margin: 26px auto 10px; width: min(340px, 70vw); height: 1px;
  background: rgba(255,255,255,.10); overflow: hidden;
}
.boot-bar i {
  display: block; height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--amber-dim), var(--amber));
  box-shadow: 0 0 12px var(--amber);
  transition: width .35s ease;
}
.boot-status {
  font-family: var(--mono); font-size: 10px; letter-spacing: .2em; color: var(--amber-dim);
}

/* ------------------------------------------------------------------ HUD -- */
.hud {
  position: fixed; z-index: 20; pointer-events: none;
  transition: opacity .35s ease, transform .35s ease;
}
body.hud-off .hud,
body.hud-off #panel,
body.hud-off #panel-open { opacity: 0; pointer-events: none; transform: translateY(-6px); }

#hud-top {
  top: 0; left: 0; right: 0;
  display: flex; justify-content: space-between; align-items: flex-start;
  padding: 18px 20px;
  background: linear-gradient(180deg, rgba(0,0,0,.62), rgba(0,0,0,0));
}
.brand { display: flex; gap: 13px; align-items: center; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 50%;
  background: #000; position: relative; flex: none;
  box-shadow: 0 0 0 1.5px var(--amber), 0 0 22px rgba(255,150,60,.55);
}
.brand-mark::after {
  content: ''; position: absolute; left: -9px; right: -9px; top: 50%;
  height: 2px; transform: translateY(-50%);
  background: linear-gradient(90deg, transparent, var(--amber), transparent);
  filter: blur(.4px);
}
.brand h1 {
  margin: 0; font-family: var(--mono); font-size: 17px;
  letter-spacing: .34em; font-weight: 500; color: #fff;
}
.brand p {
  margin: 3px 0 0; font-family: var(--mono); font-size: 9px;
  letter-spacing: .22em; color: var(--ink-dim);
}
.topright { display: flex; align-items: center; gap: 14px; }
.qual {
  font-family: var(--mono); font-size: 10px; letter-spacing: .22em;
  padding: 5px 11px; border: 1px solid var(--line-hot); color: var(--amber);
  background: rgba(255,150,60,.07);
}
.fps { font-family: var(--mono); text-align: right; color: var(--cyan); }
.fps span { font-size: 21px; }
.fps em { display: block; font-size: 8px; letter-spacing: .3em; color: var(--cyan-dim); font-style: normal; }

.panel-glass {
  background: var(--glass);
  border: 1px solid var(--line);
  backdrop-filter: blur(11px) saturate(120%);
  -webkit-backdrop-filter: blur(11px) saturate(120%);
}

#hud-left {
  left: 20px; top: 50%; transform: translateY(-50%);
  width: 244px; padding: 13px 14px;
  font-family: var(--mono); font-size: 10.5px;
}
.rowhead {
  font-size: 8.5px; letter-spacing: .28em; color: var(--amber-dim);
  margin-bottom: 7px;
}
.kv { display: flex; justify-content: space-between; gap: 8px; padding: 2.5px 0; }
.kv span { color: var(--ink-dim); }
.kv b { color: var(--ink); font-weight: 500; }
.sep { height: 1px; background: var(--line); margin: 10px 0 9px; }

#hud-bottom {
  left: 0; right: 0; bottom: 0; padding: 14px 20px 16px;
  display: flex; justify-content: center;
  background: linear-gradient(0deg, rgba(0,0,0,.62), rgba(0,0,0,0));
}
.legend {
  font-family: var(--mono); font-size: 10px; letter-spacing: .1em;
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: center;
}
.legend .dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--amber);
  box-shadow: 0 0 10px var(--amber);
}
.legend b { color: var(--ink); font-weight: 500; }
.legend em { color: var(--ink-dim); font-style: normal; letter-spacing: .06em; }

/* ---------------------------------------------------------------- panel -- */
#panel {
  position: fixed; z-index: 25; right: 18px; top: 84px; bottom: 66px;
  width: 306px; display: flex; flex-direction: column;
  transition: transform .38s cubic-bezier(.5,0,.2,1), opacity .3s;
  pointer-events: auto;
}
#panel.collapsed { transform: translateX(calc(100% + 26px)); opacity: 0; pointer-events: none; }

.panel-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 12px; border-bottom: 1px solid var(--line);
  font-family: var(--mono); font-size: 9.5px; letter-spacing: .28em; color: var(--amber);
  flex: none;
}
.panel-head .x {
  background: none; border: 1px solid var(--line); color: var(--ink-dim);
  width: 22px; height: 20px; cursor: pointer; line-height: 1; font-size: 12px;
}
.panel-head .x:hover { color: var(--amber); border-color: var(--line-hot); }

.panel-scroll { overflow-y: auto; overflow-x: hidden; padding: 12px; flex: 1; }
.panel-scroll::-webkit-scrollbar { width: 5px; }
.panel-scroll::-webkit-scrollbar-thumb { background: rgba(255,171,82,.28); }
.panel-scroll::-webkit-scrollbar-track { background: transparent; }

.block { margin-bottom: 16px; }
.block-title {
  font-family: var(--mono); font-size: 8.5px; letter-spacing: .26em;
  color: var(--cyan-dim); margin-bottom: 8px;
  padding-bottom: 5px; border-bottom: 1px solid var(--line);
}

.preset-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.preset-grid button {
  font-family: var(--mono); font-size: 8.6px; letter-spacing: .12em;
  padding: 9px 5px; background: rgba(255,255,255,.025);
  border: 1px solid var(--line); color: var(--ink-dim); cursor: pointer;
  transition: all .18s;
}
.preset-grid button:hover { color: var(--ink); border-color: var(--line-hot); background: rgba(255,171,82,.08); }
.preset-grid button.on {
  color: #0a0603; background: var(--amber); border-color: var(--amber);
  box-shadow: 0 0 16px rgba(255,171,82,.35);
}
.preset-desc {
  margin-top: 7px; font-size: 10.5px; line-height: 1.6; color: var(--ink-dim); min-height: 2.6em;
}

.seg { display: flex; border: 1px solid var(--line); }
.seg button {
  flex: 1; font-family: var(--mono); font-size: 9px; letter-spacing: .14em;
  padding: 8px 2px; background: transparent; border: none; border-right: 1px solid var(--line);
  color: var(--ink-dim); cursor: pointer; transition: all .18s;
}
.seg button:last-child { border-right: none; }
.seg button:hover { color: var(--ink); background: rgba(111,216,255,.07); }
.seg button.on { background: rgba(111,216,255,.16); color: var(--cyan); }

.toggles { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.tg {
  display: flex; align-items: center; gap: 7px; cursor: pointer;
  font-family: var(--mono); font-size: 9px; letter-spacing: .08em; color: var(--ink-dim);
  padding: 6px 7px; border: 1px solid var(--line); background: rgba(255,255,255,.02);
  transition: all .18s; user-select: none;
}
.tg:hover { border-color: var(--line-hot); color: var(--ink); }
.tg i {
  width: 8px; height: 8px; flex: none; border: 1px solid var(--cyan-dim);
  background: transparent; transition: all .18s;
}
.tg.on { color: var(--cyan); border-color: rgba(111,216,255,.34); }
.tg.on i { background: var(--cyan); box-shadow: 0 0 9px var(--cyan); }

.pslider { margin-bottom: 11px; }
.pslider .lab {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--mono); font-size: 9.5px; margin-bottom: 4px;
}
.pslider .lab span { color: var(--ink-dim); letter-spacing: .04em; }
.pslider .lab b { color: var(--amber); font-weight: 500; font-variant-numeric: tabular-nums; }
.pslider .lab b i { color: var(--amber-dim); font-style: normal; font-size: 8px; margin-left: 2px; }

input[type=range] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 14px; background: transparent; cursor: pointer; margin: 0;
}
input[type=range]::-webkit-slider-runnable-track {
  height: 1px; background: rgba(255,255,255,.18);
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 9px; height: 9px; margin-top: -4px; border-radius: 50%;
  background: var(--amber); box-shadow: 0 0 9px rgba(255,171,82,.75);
  border: none;
}
input[type=range]::-moz-range-track { height: 1px; background: rgba(255,255,255,.18); }
input[type=range]::-moz-range-thumb {
  width: 9px; height: 9px; border-radius: 50%; border: none;
  background: var(--amber); box-shadow: 0 0 9px rgba(255,171,82,.75);
}

.btn-row { display: flex; gap: 6px; margin-bottom: 6px; }
.btn {
  flex: 1; font-family: var(--mono); font-size: 9px; letter-spacing: .14em;
  padding: 9px 6px; background: rgba(255,255,255,.03);
  border: 1px solid var(--line); color: var(--ink-dim); cursor: pointer; transition: all .18s;
}
.btn:hover { color: var(--amber); border-color: var(--line-hot); background: rgba(255,171,82,.09); }
.btn.wide { margin-top: 20px; width: 200px; flex: none; }

.fab {
  position: fixed; z-index: 26; right: 18px; top: 84px;
  width: 40px; height: 40px; font-size: 15px;
  background: var(--glass-2); border: 1px solid var(--line-hot); color: var(--amber);
  cursor: pointer; backdrop-filter: blur(10px); transition: all .2s;
}
.fab:hover { background: rgba(255,171,82,.16); }
.fab.hidden { opacity: 0; pointer-events: none; }

/* ----------------------------------------------------------------- help -- */
.help-card {
  width: min(760px, 92vw); max-height: 86vh; overflow-y: auto;
  background: var(--glass-2); border: 1px solid var(--line-hot); padding: 26px 28px;
  backdrop-filter: blur(16px);
}
.help-card h2 {
  margin: 0 0 18px; font-family: var(--mono); font-size: 13px;
  letter-spacing: .3em; color: var(--amber); font-weight: 500;
}
.help-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 6px 26px; }
.hk { display: flex; justify-content: space-between; gap: 12px; padding: 5px 0; border-bottom: 1px dashed rgba(255,255,255,.07); }
.hk kbd {
  font-family: var(--mono); font-size: 9.5px; color: var(--cyan);
  border: 1px solid var(--cyan-dim); padding: 1px 6px; background: rgba(111,216,255,.08);
  white-space: nowrap;
}
.hk span { font-size: 11.5px; color: var(--ink-dim); text-align: right; }
.help-foot {
  margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center; gap: 18px;
}
.help-foot span { font-size: 10.5px; color: var(--ink-dim); line-height: 1.6; }
.help-foot .btn { flex: none; padding: 9px 18px; }
.help-credit {
  margin: 14px 0 0; text-align: center; font-family: var(--mono);
  font-size: 9.5px; letter-spacing: .08em; color: var(--ink-dim);
}
.help-credit a { color: var(--cyan); text-decoration: none; }
.help-credit a:hover { color: var(--amber); text-decoration: underline; }

/* ---------------------------------------------------------------- toast -- */
#toast {
  position: fixed; z-index: 60; left: 50%; bottom: 74px; transform: translateX(-50%) translateY(10px);
  font-family: var(--mono); font-size: 10px; letter-spacing: .16em;
  padding: 9px 18px; background: var(--glass-2); border: 1px solid var(--line-hot);
  color: var(--amber); opacity: 0; pointer-events: none; transition: all .3s ease;
  white-space: nowrap; max-width: 90vw; overflow: hidden; text-overflow: ellipsis;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* --------------------------------------------------------- mobile / small */
@media (max-width: 900px) {
  #hud-left { display: none; }
  #panel { top: 74px; bottom: 58px; width: min(280px, 78vw); right: 12px; }
  .fab { right: 12px; top: 74px; }
  .brand h1 { font-size: 14px; letter-spacing: .26em; }
  .brand p { display: none; }
  .legend em { display: none; }
  #hud-top { padding: 12px 14px; }
}
@media (max-width: 560px) {
  .preset-grid { grid-template-columns: 1fr; }
  .fps span { font-size: 17px; }
  #toast { bottom: 60px; font-size: 9px; }
}
@media (prefers-reduced-motion: reduce) {
  .overlay, #panel, .btn, .tg { transition: none; }
}