:root {
  /* Colour system aligned with the "Fly Connectome Dashboard.dc" design */
  --bg: #0d1016;
  --panel: #12161d;    /* card body */
  --panel-2: #141820;  /* card header/footer background */
  --panel-3: #1b212a;  /* select/button background */
  --line: #232a33;     /* card borders, dividers */
  --line-2: #2a323c;   /* HUD chip and overlay borders */
  --line-3: #2f3742;   /* select/button borders */
  --grid-line: #1a2028; /* canvas grid texture */
  --ink: #f2f5f8;       /* headings, brightest text */
  --ink-2: #e8ecf1;     /* ordinary bright body text */
  --muted: #a7b1bd;     /* explanatory text */
  --dim: #7e8a97;       /* secondary notes */
  --dimmer: #6f7b88;    /* labels, units */
  --faint: #39424e;     /* placeholders and other very faint text */
  --accent: oklch(0.78 0.15 62);      /* amber: CTA, emphasised numbers, eyebrow */
  --accent-hi: oklch(0.84 0.15 62);
  --accent-ink: #1a1205;              /* text on an accent background */
  --accent-2: oklch(0.80 0.13 212);   /* cyan: links, secondary emphasis */
  --ok: oklch(0.78 0.15 145);         /* running indicator */
  --warn: #f0b429;
  --danger: #ff5f56;
  --exc: #f97316; /* for canvas drawing: excitatory / orange */
  --inh: #38bdf8; /* for canvas drawing: inhibitory / blue */
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: "Noto Sans TC", "IBM Plex Sans", system-ui, -apple-system, "Microsoft JhengHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink-2);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-2); border-bottom: 1px solid oklch(0.80 0.13 212 / .35); text-decoration: none; }
a:hover { color: oklch(0.88 0.14 212); border-bottom-color: oklch(0.88 0.14 212 / .8); }
::selection { background: oklch(0.78 0.15 62 / .3); }
code { font-family: var(--mono); font-size: 0.92em; color: var(--accent-2); border: none; }

.wrap { max-width: 1320px; margin: 0 auto; padding: 0 28px; }

/* ---------------- nav ---------------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13, 16, 22, .88); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-in {
  max-width: 1320px; margin: 0 auto; padding: 0 28px;
  height: 60px; display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--sans); font-weight: 700; font-size: 15px; color: var(--ink);
  letter-spacing: .01em; border: none;
}
.brand:hover { text-decoration: none; color: var(--ink); }
.mark { color: var(--accent); font-size: 13px; }
.ver {
  font-family: var(--mono); font-size: 10px; letter-spacing: .14em; color: var(--dimmer);
  border: 1px solid var(--line-3); border-radius: 3px; padding: 2px 6px; text-transform: uppercase;
}
.nav-links { display: flex; align-items: center; gap: 2px; font-family: var(--mono); font-size: 12px; letter-spacing: .06em; }
.nav-links a { color: var(--dim); border: none; padding: 8px 11px; border-radius: 4px; }
.nav-links a:hover { color: var(--ink); background: #1a1f27; text-decoration: none; }
.nav-links a.ext { color: var(--accent-2); border: 1px solid var(--line-3); margin-left: 6px; }
.nav-links a.ext:hover { background: #1a1f27; }

/* Language toggle: the dashboard's two-key style, with the active one filled in accent */
.lang {
  display: inline-flex; margin-left: 10px;
  border: 1px solid var(--line-3); border-radius: 4px; overflow: hidden;
}
.lang button {
  font-family: var(--mono); font-size: 11px; letter-spacing: .08em;
  padding: 6px 10px; border: none; background: transparent; color: var(--dim); cursor: pointer;
}
.lang button + button { border-left: 1px solid var(--line-3); }
.lang button:hover { color: var(--ink); background: #1a1f27; }
.lang button.on { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.lang button.on:hover { background: var(--accent-hi); }

@media (max-width: 680px) {
  .nav-links { gap: 0; font-size: 11px; }
  .brand { font-size: 13px; }
  .ver { display: none; }
  .lang { margin-left: 4px; }
  .lang button { padding: 5px 7px; font-size: 10px; }
}

/* ---------------- hero ---------------- */
.eyebrow {
  font-family: var(--mono); font-size: 11px; letter-spacing: .22em;
  color: var(--accent); text-transform: uppercase; margin: 0 0 14px;
}
.hero {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr));
  gap: 56px; align-items: start; padding: 72px 0 56px; border-bottom: 1px solid var(--line);
}
.hero h1 {
  font-size: clamp(30px, 3.6vw, 52px); line-height: 1.12; font-weight: 700;
  margin: 0 0 24px; letter-spacing: -.015em; color: var(--ink);
}
.lede { color: var(--muted); margin: 0; max-width: 60ch; font-size: 16px; line-height: 1.75; }
.hero-r { padding-top: 0; }

/* The 1px-gap grid divider trick: the lines are simply the grid's own background showing through */
.stats {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px;
  background: var(--line); border: 1px solid var(--line); margin: 0 0 20px;
}
.stats div { background: var(--panel-2); padding: 16px 18px; }
.stats dt {
  font-family: var(--mono); font-size: 10px; letter-spacing: .13em; color: var(--dimmer);
  text-transform: uppercase; margin-bottom: 8px;
}
.stats dd { margin: 0; font-family: var(--mono); font-size: 28px; font-weight: 500; color: var(--ink); letter-spacing: -.02em; }
.stats dd.accent { color: var(--accent); }
.jump {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12px; letter-spacing: .08em; color: var(--muted);
  border: 1px solid var(--line-3); border-radius: 4px; padding: 9px 14px;
}
.jump:hover { color: var(--ink); border-color: #3a434f; background: var(--panel-2); text-decoration: none; }
@media (max-width: 900px) { .hero { padding: 40px 0 32px; } }

/* ---------------- status bar ---------------- */
.statusbar {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px;
  padding: 16px 20px; background: var(--panel-2); border: 1px solid var(--line); border-radius: 6px;
  margin: 28px 0 24px; scroll-margin-top: 66px;
}
.statusbar-l { display: flex; align-items: center; gap: 10px; font-size: 12.5px; font-family: var(--mono); letter-spacing: .04em; }
.statusbar-r { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
@keyframes livepulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: .35; transform: scale(.82); } }
.dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--ok);
  box-shadow: 0 0 10px oklch(0.78 0.15 145 / .8); display: inline-block;
  animation: livepulse 1.8s ease-in-out infinite;
}
.dot.off { background: var(--dim); box-shadow: none; animation: none; }
.dot.dead { background: var(--danger); box-shadow: 0 0 9px var(--danger); animation: none; }
.sep { color: var(--faint); }
.muted { color: var(--dim); }

button, select {
  background: var(--panel-3); color: var(--ink-2); border: 1px solid var(--line-3);
  padding: 8px 14px; border-radius: 4px; font: inherit; font-size: 12.5px; cursor: pointer;
}
button:hover { background: #232b35; color: var(--ink); border-color: #4a5461; }
select:hover { border-color: #4a5461; }
button:disabled { opacity: .5; cursor: default; }
button.primary {
  background: var(--accent); border-color: var(--accent); color: var(--accent-ink);
  font-weight: 700; padding: 8px 18px;
}
button.primary:hover { background: var(--accent-hi); color: var(--accent-ink); }
label.ctl {
  display: flex; align-items: center; gap: 8px; color: var(--dim);
  font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase;
}
label.ctl select { text-transform: none; letter-spacing: 0; font-family: var(--sans); font-size: 12px; }
label.ctl.mini { font-size: 11px; }
label.ctl.mini select { padding: 6px 9px; font-size: 12px; font-family: var(--mono); }

/* ---------------- panel grid ---------------- */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); gap: 18px; }

.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; display: flex; flex-direction: column; }
.panel.wide { margin-top: 18px; }

.phead {
  display: flex; align-items: baseline; justify-content: space-between; gap: 12px;
  padding: 13px 16px; border-bottom: 1px solid var(--line); background: var(--panel-2);
  font-family: var(--mono); font-size: 12px; letter-spacing: .1em;
}
.phead b { color: var(--ink); font-weight: 600; }
.phead span { color: var(--dimmer); text-align: right; font-size: 10.5px; text-transform: uppercase; }

.media {
  position: relative; aspect-ratio: 16 / 9; background: #0e1218;
  background-image: linear-gradient(var(--grid-line) 1px, transparent 1px),
                     linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 36px 36px;
}
.media.short { aspect-ratio: 1200 / 260; background-size: 40px 40px; }
.media canvas { position: relative; display: block; width: 100%; height: 100%; }
.media.stage canvas { background: #eaf5ff; }

.pfoot {
  display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap;
  padding: 11px 16px; border-top: 1px solid var(--line);
  font-size: 11.5px; color: var(--dim); font-family: var(--mono);
}
/* Align right when only one control is left, rather than padding the row with an empty span */
.pfoot-end { justify-content: flex-end; }

/* Legend for panel 04 (brain activity): what the node colours/shapes and link colours mean */
.legend {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px;
  padding: 11px 16px; border-top: 1px solid var(--line); background: var(--panel-2);
  font-family: var(--sans); font-size: 12.5px; color: var(--ink-2);
}
.legend span { display: inline-flex; align-items: center; gap: 7px; white-space: nowrap; }
.legend span.muted { color: var(--dim); font-size: 11.5px; font-family: var(--mono); }
.legend s { display: inline-block; text-decoration: none; flex: none; }
.legend .lg-dot { width: 10px; height: 10px; border-radius: 50%; }
.legend .lg-sq { width: 9px; height: 9px; background: var(--muted); }
.legend .lg-ring { width: 10px; height: 10px; border-radius: 50%; border: 2px solid #facc15; background: transparent; }
.legend .lg-line { width: 18px; height: 2.5px; border-radius: 1px; }

.hud {
  position: absolute; inset: 12px 12px auto 12px;
  display: flex; gap: 6px; flex-wrap: wrap; pointer-events: none;
  font-family: var(--mono); font-size: 11px;
}
.chip {
  background: rgba(13, 16, 22, .82); border: 1px solid var(--line-2); color: var(--ink-2);
  padding: 4px 8px; border-radius: 3px; letter-spacing: .06em;
}
/* Current action along the bottom of panel 01: the label keeps the note colour, the action name gets accent */
.actnow { display: inline-flex; align-items: center; gap: 8px; }
.actnow b { color: var(--accent); font-weight: 600; font-size: 13px; letter-spacing: .08em; }
.chip.on { border-color: var(--warn); color: var(--warn); }
.chip.dead { border-color: var(--danger); color: var(--danger); }

.overlay-tag {
  position: absolute; left: 12px; bottom: 12px; pointer-events: none;
  font-family: var(--mono); font-size: 11px; color: var(--ink-2);
  background: rgba(13, 16, 22, .82); padding: 4px 8px; border-radius: 3px;
  border: 1px solid var(--line-2);
}
.overlay-btns { position: absolute; right: 12px; bottom: 12px; display: flex; gap: 6px; }
.overlay-btns button {
  font-family: var(--mono); font-size: 11px; color: var(--muted);
  background: rgba(13, 16, 22, .85); border: 1px solid var(--line-3); padding: 5px 10px;
}
.overlay-btns button:hover { color: var(--ink); border-color: #4a5461; }

/* ---------------- sensory channels ---------------- */
.feats {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 1px;
  background: var(--line); padding: 1px;
}
.fx { background: var(--panel); padding: 12px 13px; display: grid; grid-template-columns: 1fr 42px; gap: 2px 9px; align-items: center; }
.fx .nm {
  font-size: 12px; color: var(--ink-2); line-height: 1.34;
  min-height: 2.68em;  /* Lock two lines: English names wrap, and this keeps rows level when Chinese fits on one */
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden;
}
.fx .vl { font-family: var(--mono); font-size: 11px; color: var(--dim); text-align: right; }
.fx .bar { grid-column: 1 / -1; height: 4px; background: var(--line); border-radius: 2px; overflow: hidden; margin-top: 4px; }
.fx .bar i { display: block; height: 100%; border-radius: 2px; transition: width .06s linear; }
.fx .ct { grid-column: 1 / -1; font-family: var(--mono); font-size: 9.5px; color: var(--dimmer); margin-top: 2px; }

/* ---------------- sections ---------------- */
.section { margin-top: 76px; scroll-margin-top: 66px; }
.section h2 { font-size: clamp(24px, 2.5vw, 34px); margin: 0 0 18px; font-weight: 700; letter-spacing: -.012em; color: var(--ink); }
.section > .lede { margin-bottom: 26px; font-size: 15.5px; }
.section .panel { margin-top: 4px; }

table { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 12.5px; }
th, td { padding: 10px 16px; text-align: right; border-bottom: 1px solid var(--line); }
th:first-child, td:first-child { text-align: left; }
th { color: var(--dimmer); font-weight: 600; font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; }
td.num { font-family: var(--mono); }
tr:last-child td { border-bottom: none; }
tr.hero-row td { color: var(--accent); font-weight: 600; background: oklch(0.78 0.15 62 / .06); }
tr.abl td { color: var(--danger); }

.claim {
  margin: 0 16px 14px; padding: 12px 14px; border-radius: 6px;
  background: oklch(0.78 0.15 145 / .08); border: 1px solid oklch(0.78 0.15 145 / .28);
  font-family: var(--sans); font-size: 13.5px; color: #b9f0d0;
}
.claim.bad { background: rgba(255, 95, 86, .08); border-color: rgba(255, 95, 86, .28); color: #ffb4af; }
.note { color: var(--dim); font-size: 11.5px; margin: 0; padding: 12px 16px; font-family: var(--mono); line-height: 1.6; }
.section > .note {
  padding: 0; margin-top: 22px; max-width: 78ch; font-family: var(--sans); font-size: 12.5px;
  line-height: 1.75; border-left: 2px solid var(--line-3); padding-left: 16px;
}

/* Method steps: 1px-gap grid divider rows, replacing the rounded numbered cards */
.steps {
  list-style: none; padding: 0; margin: 0; display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); gap: 1px;
  background: var(--line); border: 1px solid var(--line);
}
.steps li { background: var(--panel); padding: 22px 20px; font-size: 14.5px; line-height: 1.7; color: var(--muted); }
.steps .tag {
  display: block; font-family: var(--mono); font-size: 11px; letter-spacing: .16em;
  color: var(--accent); margin-bottom: 12px;
}
.steps b { color: var(--ink); font-weight: 700; margin-right: 0; }
/* English steps open with a full sentence like "Observe.", which needs a gap before the body; Chinese does not */
:root[lang="en"] .steps b { margin-right: .32em; }

.trainbar { gap: 12px; }
.tstat { color: var(--dim); font-size: 11.5px; }
.tstat.run { color: var(--warn); }
.tstat.done { color: var(--ok); }

/* ---------------- footer ---------------- */
footer {
  margin-top: 84px; padding: 32px 0 64px; border-top: 1px solid var(--line);
  display: grid; gap: 14px; font-size: 12px; line-height: 1.8; color: var(--dim);
}
footer p { margin: 0; max-width: 96ch; }
footer .attrib { font-family: var(--mono); font-size: 11.5px; letter-spacing: .04em; color: var(--muted); }