/* DIFFERENTIAL — styles.css */
:root {
  --bg0: #0a0e13;
  --bg1: #131a23;
  --panel: rgba(14, 19, 27, 0.86);
  --panel-edge: rgba(120, 150, 190, 0.16);
  --text: #dfe7f1;
  --text-dim: #8fa0b4;
  --accent: #22d3ee;
  --amber: #f0a13c;
  --teal: #2dd4bf;
  --blue: #3b82f6;
  --green: #21b57f;
  --violet: #a78bfa;
  --red: #e5484d;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; height: 100%; overflow: hidden; }
body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: radial-gradient(120% 90% at 50% 20%, var(--bg1) 0%, var(--bg0) 68%);
  user-select: none;
}

/* ---------------------------------------------------------------- stage */
#stage { position: fixed; inset: 0; }
#stage canvas { display: block; width: 100%; height: 100%; touch-action: none; }
#leaders { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 5; }
#labels { position: absolute; inset: 0; pointer-events: none; z-index: 6; overflow: hidden; }
.lbl {
  position: absolute; top: 0; left: 0;
  padding: 3px 8px;
  font-size: 11px; font-weight: 600; letter-spacing: 0.06em;
  background: rgba(10, 14, 19, 0.82);
  border: 1px solid; border-radius: 3px;
  white-space: nowrap; opacity: 0; visibility: hidden;
  transition: opacity 0.15s linear;
}

/* ---------------------------------------------------------------- fatal */
#fatal {
  position: fixed; inset: 0; z-index: 100; display: none;
  align-items: center; justify-content: center;
  background: var(--bg0); text-align: center; line-height: 1.6;
}
#fatal code { color: var(--accent); }

/* --------------------------------------------------------------- topbar */
#topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 20;
  display: flex; align-items: center; gap: 18px;
  padding: 10px 16px;
  background: linear-gradient(rgba(10, 14, 19, 0.92), rgba(10, 14, 19, 0.55) 75%, transparent);
  pointer-events: none;
}
#topbar > * { pointer-events: auto; }
#brand h1 { font-size: 17px; letter-spacing: 0.24em; font-weight: 800; color: #fff; }
#brand span { font-size: 10.5px; letter-spacing: 0.12em; color: var(--text-dim); text-transform: uppercase; }
#chaptabs { display: flex; gap: 4px; flex-wrap: wrap; flex: 1; justify-content: center; }
#chaptabs button {
  font-size: 10.5px; letter-spacing: 0.04em; padding: 4px 9px;
  background: transparent; color: var(--text-dim);
  border: 1px solid transparent; border-radius: 3px; cursor: pointer;
}
#chaptabs button:hover { color: var(--text); border-color: var(--panel-edge); }
#chaptabs button.on { color: var(--accent); border-color: rgba(34, 211, 238, 0.4); background: rgba(34, 211, 238, 0.07); }
#topright { display: flex; gap: 8px; }
#tglTour {
  font-size: 10.5px; letter-spacing: 0.1em; font-weight: 700; padding: 6px 12px;
  background: rgba(34, 211, 238, 0.1); color: var(--accent);
  border: 1px solid rgba(34, 211, 238, 0.45); border-radius: 3px; cursor: pointer;
}
#tglTour:hover { background: rgba(34, 211, 238, 0.2); }
#btnHelp {
  width: 26px; font-weight: 700; background: transparent; color: var(--text-dim);
  border: 1px solid var(--panel-edge); border-radius: 3px; cursor: pointer;
}
#btnHelp:hover { color: var(--text); }

/* -------------------------------------------------------------- leftrail */
#leftrail {
  position: fixed; left: 12px; top: 68px; z-index: 15; width: 158px;
  display: flex; flex-direction: column; gap: 10px;
}
#leftrail section, #rightrail section {
  background: var(--panel); border: 1px solid var(--panel-edge);
  border-radius: 6px; padding: 9px 11px;
  backdrop-filter: blur(6px);
}
#leftrail h3, #rightrail h3, #chart h3 {
  font-size: 9.5px; letter-spacing: 0.18em; color: var(--text-dim);
  margin-bottom: 7px; font-weight: 700;
}
#leftrail h3 em { font-style: normal; opacity: 0.65; letter-spacing: 0.04em; }
#experiments { display: flex; flex-direction: column; gap: 3px; }
#experiments button {
  font-size: 10px; font-weight: 800; letter-spacing: 0.14em; padding: 5px 0;
  background: rgba(255, 255, 255, 0.03); color: var(--text-dim);
  border: 1px solid var(--panel-edge); border-radius: 3px; cursor: pointer;
}
#experiments button:hover { color: var(--text); }
#experiments button.on { color: #0c1116; background: var(--accent); border-color: var(--accent); }
#leftrail label { display: block; font-size: 10.5px; color: var(--text-dim); margin-bottom: 6px; }
#leftrail input[type="range"] { width: 100%; margin-top: 3px; accent-color: var(--accent); }
#viewtoggles, #drivetoggles { display: flex; flex-direction: column; gap: 3px; margin-top: 2px; }
#viewtoggles button, #drivetoggles button {
  font-size: 9.5px; letter-spacing: 0.12em; font-weight: 700; padding: 4px 0;
  background: rgba(255, 255, 255, 0.03); color: var(--text-dim);
  border: 1px solid var(--panel-edge); border-radius: 3px; cursor: pointer;
}
#viewtoggles button.on { color: var(--accent); border-color: rgba(34, 211, 238, 0.45); }
#tglRide.on { color: var(--green); border-color: rgba(33, 181, 127, 0.55); }
#tglLock.on { color: var(--red); border-color: rgba(229, 72, 77, 0.55); }

/* ------------------------------------------------------------- rightrail */
#rightrail {
  position: fixed; right: 12px; top: 68px; z-index: 15; width: 230px;
  display: flex; flex-direction: column; gap: 10px;
}
.ro {
  display: flex; align-items: baseline; justify-content: space-between;
  font-size: 11px; color: var(--text-dim); padding: 2px 0; gap: 6px;
}
.ro b { font-weight: 600; color: var(--text); font-variant-numeric: tabular-nums; }
.ro b i { font-style: normal; font-size: 13px; }
.ro.mem { border-left: 3px solid transparent; padding-left: 6px; }
.ro.mem[data-c="left"] { border-color: var(--amber); }
.ro.mem[data-c="right"] { border-color: var(--teal); }
.ro.mem[data-c="carrier"] { border-color: var(--green); }
.ro.mem[data-c="spider"] { border-color: var(--red); }
.ro.mem em { font-style: normal; font-size: 9px; letter-spacing: 0.08em; color: var(--text-dim); min-width: 62px; text-align: right; }
.pill {
  font-size: 9px; font-weight: 700; letter-spacing: 0.1em;
  padding: 2px 7px; border-radius: 8px; white-space: nowrap;
}
.pill.on { background: rgba(126, 224, 129, 0.14); color: #7ee081; border: 1px solid rgba(126, 224, 129, 0.4); }
.pill.mid { background: rgba(255, 209, 102, 0.14); color: #ffd166; border: 1px solid rgba(255, 209, 102, 0.4); }
.pill.off { background: rgba(143, 160, 180, 0.1); color: var(--text-dim); border: 1px solid var(--panel-edge); }

.law { font-size: 10px; letter-spacing: 0.06em; color: var(--text-dim); }
.law.law2 { margin-top: 7px; }
.lawlive {
  font-size: 13px; font-weight: 700; color: var(--accent);
  font-variant-numeric: tabular-nums; letter-spacing: 0.04em;
  padding: 2px 0 1px;
}

/* ------------------------------------------------------- experiment chart */
#chart {
  position: fixed; right: 254px; top: 68px; z-index: 14;
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 6px;
  padding: 10px 12px; backdrop-filter: blur(6px);
  opacity: 0; transform: translateY(-8px); pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
}
#chart.open { opacity: 1; transform: none; }
#chart table { border-collapse: collapse; font-size: 10.5px; }
#chart th { font-size: 8.5px; letter-spacing: 0.1em; color: var(--text-dim); padding: 2px 8px; text-align: right; }
#chart th:first-child { text-align: left; }
#chart td { padding: 3px 8px; color: var(--text); border-top: 1px solid rgba(120, 150, 190, 0.08); text-align: right; font-variant-numeric: tabular-nums; }
#chart td:first-child { font-weight: 800; text-align: left; }
#chart tr.hi td { background: rgba(34, 211, 238, 0.1); }
#chart td.cl { color: var(--amber); }
#chart td.cr { color: var(--teal); }
#chart td.cc { color: var(--green); }
#chart td.cs { color: var(--red); }
#chart p { font-size: 9px; color: var(--text-dim); margin-top: 6px; letter-spacing: 0.03em; }

/* ------------------------------------------------------------- bottombar */
#bottombar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 8px 16px 12px;
  background: linear-gradient(transparent, rgba(10, 14, 19, 0.6) 25%, rgba(10, 14, 19, 0.94));
  pointer-events: none;
}
#bottombar > * { pointer-events: auto; }
#tags { display: flex; gap: 8px; min-height: 0; }
.tagchip {
  font-size: 10px; letter-spacing: 0.06em; padding: 3px 10px;
  background: rgba(10, 14, 19, 0.85); border: 1px solid; border-radius: 12px;
}
#caption { width: min(760px, 92vw); text-align: center; }
#caption.pulse { animation: capIn 0.35s ease-out; }
@keyframes capIn { from { opacity: 0.2; transform: translateY(6px); } to { opacity: 1; transform: none; } }
#cap-kicker { font-size: 9.5px; letter-spacing: 0.22em; color: var(--accent); font-weight: 700; }
#cap-head { font-size: 17px; font-weight: 700; color: #fff; margin: 2px 0 4px; }
#cap-body { font-size: 12.5px; line-height: 1.5; color: var(--text); }
#cap-note { font-size: 11px; line-height: 1.45; color: var(--text-dim); font-style: italic; margin-top: 4px; display: none; }
#transport { display: flex; align-items: center; gap: 8px; width: min(680px, 90vw); }
#transport button {
  font-size: 13px; width: 30px; height: 26px;
  background: rgba(255, 255, 255, 0.04); color: var(--text);
  border: 1px solid var(--panel-edge); border-radius: 3px; cursor: pointer;
}
#transport button:hover { border-color: var(--accent); color: var(--accent); }
#scrub { flex: 1; accent-color: var(--accent); }
#timelbl { font-size: 10px; color: var(--text-dim); min-width: 76px; text-align: center; font-variant-numeric: tabular-nums; letter-spacing: 0.05em; }
#speedbtns { display: flex; gap: 2px; }
#speedbtns button { font-size: 10px; width: 30px; }
#speedbtns button.on { color: var(--accent); border-color: rgba(34, 211, 238, 0.5); }
body[data-mode="explore"] #caption, body[data-mode="explore"] #tags { display: none; }

/* ------------------------------------------------------------------ help */
#help {
  position: fixed; inset: 0; z-index: 60; display: none;
  align-items: center; justify-content: center;
  background: rgba(6, 9, 13, 0.78); cursor: pointer;
}
#help.open { display: flex; }
#help > div {
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 8px;
  padding: 22px 28px; max-width: 500px; line-height: 1.7; font-size: 12.5px;
}
#help h2 { font-size: 13px; letter-spacing: 0.2em; color: var(--accent); margin-bottom: 8px; }
#help b { color: var(--accent); font-weight: 700; }
#help .fine { font-size: 10.5px; color: var(--text-dim); margin-top: 10px; line-height: 1.55; }

/* ---------------------------------------------------- small screens */
@media (max-width: 1100px) {
  #chart { right: 12px; top: auto; bottom: 128px; }
  #rightrail { display: none; }
}
@media (max-width: 760px) {
  #leftrail { display: none; }
  #chaptabs { display: none; }
}

/* Back to the Parastrate dashboard (parastrate.com hosts these lessons). */
#homelink {
  pointer-events: auto; flex: none; white-space: nowrap;
  font-size: 10.5px; letter-spacing: 0.06em; text-decoration: none;
  color: #9aa7b4; padding: 4px 9px; border: 1px solid rgba(255, 255, 255, 0.14); border-radius: 3px;
}
#homelink:hover { color: #fff; border-color: rgba(255, 255, 255, 0.4); }