/* ============================================================
   AURORA POINT — Nuclear Systems Simulator
   Dark control-gallery aesthetic. Educational use only.
   ============================================================ */

:root {
  /* surfaces */
  --bg0: #04070c;
  --bg1: #080d16;
  --bg2: #0d1521;
  --bg3: #121c2c;
  --panel: rgba(10, 17, 28, 0.92);
  --panel-solid: #0b1320;
  --line: #1b2a3f;
  --line-bright: #2a4060;

  /* text */
  --text: #d9e4f5;
  --text-dim: #8295ad;
  --text-faint: #51647e;

  /* system colours */
  --heat: #ff6a2a;
  --heat-hi: #ffb347;
  --cool: #2dd4ce;
  --cool-deep: #2f7ff0;
  --steam: #d4dde8;
  --gas: #9fb8cc;
  --salt: #ffae42;
  --elec: #ffd23f;
  --safe: #3ddc84;
  --warn: #ffb020;
  --danger: #ff4757;
  --contain: #8b7bff;

  /* type */
  --font-display: 'Chakra Petch', 'Trebuchet MS', sans-serif;
  --font-body: 'Saira', 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Consolas', monospace;
  --fs: 1.0;

  /* layout */
  --topbar-h: 56px;
  --sidenav-w: 248px;
  --dash-w: 332px;
  --bottom-h: 118px;

  --glow-cool: 0 0 14px rgba(45, 212, 206, 0.35);
  --glow-heat: 0 0 14px rgba(255, 106, 42, 0.4);
}

/* Colour-blind safe palette (Okabe–Ito inspired) */
body.cb-safe {
  --heat: #e69f00;
  --heat-hi: #f0c948;
  --cool: #56b4e9;
  --cool-deep: #0072b2;
  --safe: #009e73;
  --warn: #cc79a7;
  --danger: #d55e00;
  --elec: #f0e442;
  --contain: #9b8bf4;
}

body.high-contrast {
  --bg0: #000;
  --bg1: #000;
  --bg2: #06090f;
  --bg3: #0a0f18;
  --panel: rgba(0, 0, 0, 0.95);
  --text: #ffffff;
  --text-dim: #c0cee0;
  --text-faint: #93a7c0;
  --line: #3a567c;
}

body.dyslexia-font {
  --font-body: Verdana, 'Trebuchet MS', sans-serif;
  --font-display: Verdana, 'Trebuchet MS', sans-serif;
  letter-spacing: 0.03em;
  word-spacing: 0.08em;
}
body.dyslexia-font p, body.dyslexia-font li { line-height: 1.75; }

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg0);
  color: var(--text);
  font-family: var(--font-body);
  font-size: calc(14.5px * var(--fs));
  line-height: 1.5;
  overflow: hidden;
}

/* ambient backdrop */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(1100px 600px at 75% -10%, rgba(47, 127, 240, 0.10), transparent 60%),
    radial-gradient(900px 700px at -10% 110%, rgba(45, 212, 206, 0.07), transparent 55%),
    radial-gradient(700px 500px at 50% 115%, rgba(255, 106, 42, 0.05), transparent 60%);
}
/* scanline grain */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 999;
  pointer-events: none;
  opacity: 0.05;
  background: repeating-linear-gradient(0deg, transparent 0 2px, rgba(140, 190, 255, 0.5) 2px 3px);
  mix-blend-mode: overlay;
}
body.reduced-motion::after { display: none; }

::selection { background: rgba(45, 212, 206, 0.3); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  letter-spacing: 0.04em;
  margin: 0 0 0.5em;
}

a { color: var(--cool); }
button { font-family: inherit; }
code, .mono { font-family: var(--font-mono); }

/* scrollbars */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: var(--bg1); }
::-webkit-scrollbar-thumb { background: var(--line-bright); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: #3a5a85; }

.noscript-warning, .boot-error {
  position: fixed; inset: 20% 10%; z-index: 2000;
  background: var(--bg2); border: 1px solid var(--danger);
  padding: 2rem; border-radius: 8px;
}
.boot-error pre { white-space: pre-wrap; color: var(--danger); }

/* ============ APP GRID ============ */
.app {
  position: relative;
  z-index: 1;
  display: grid;
  height: 100vh;
  grid-template-columns: var(--sidenav-w) 1fr var(--dash-w);
  grid-template-rows: var(--topbar-h) 1fr var(--bottom-h);
  grid-template-areas:
    "top top top"
    "nav stage dash"
    "bottom bottom bottom";
}

.topbar { grid-area: top; }
.sidenav { grid-area: nav; }
.stage { grid-area: stage; }
.dashboard { grid-area: dash; }
.bottombar { grid-area: bottom; }

/* ============ TOP BAR ============ */
.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 16px;
  background: linear-gradient(180deg, var(--bg2), var(--bg1));
  border-bottom: 1px solid var(--line);
  box-shadow: 0 2px 18px rgba(0, 0, 0, 0.6);
  z-index: 30;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.14em;
  white-space: nowrap;
}
.brand .atom {
  width: 28px; height: 28px;
  position: relative;
  flex: 0 0 auto;
}
.brand .atom::before {
  content: ''; position: absolute; inset: 0;
  border: 2px solid var(--cool); border-radius: 50%;
  box-shadow: var(--glow-cool), inset 0 0 8px rgba(45,212,206,.25);
}
.brand .atom::after {
  content: ''; position: absolute; inset: 9px;
  background: var(--heat); border-radius: 50%;
  box-shadow: var(--glow-heat);
  animation: core-pulse 2.6s ease-in-out infinite;
}
@keyframes core-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(0.82); opacity: 0.75; }
}
body.reduced-motion .brand .atom::after { animation: none; }
.brand small {
  display: block;
  font-size: 0.58rem;
  letter-spacing: 0.28em;
  color: var(--text-dim);
  font-weight: 500;
}

.topbar .status-strip {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 99px;
  background: var(--bg2);
  color: var(--text-dim);
  white-space: nowrap;
}
.status-pill b { color: var(--text); font-weight: 600; }
.status-pill .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--safe);
  box-shadow: 0 0 8px var(--safe);
}
.status-pill.warn .dot { background: var(--warn); box-shadow: 0 0 8px var(--warn); animation: blink 1s steps(2) infinite; }
.status-pill.danger .dot { background: var(--danger); box-shadow: 0 0 10px var(--danger); animation: blink 0.6s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0.25; } }
body.reduced-motion .status-pill .dot { animation: none; }

.edu-banner {
  font-size: 0.62rem;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  color: var(--warn);
  border: 1px dashed rgba(255, 176, 32, 0.5);
  padding: 3px 9px;
  border-radius: 4px;
  cursor: pointer;
  background: rgba(255, 176, 32, 0.06);
}
.edu-banner:hover { background: rgba(255, 176, 32, 0.14); }

/* ============ SIDE NAV ============ */
.sidenav {
  background: linear-gradient(180deg, var(--bg1), var(--bg0));
  border-right: 1px solid var(--line);
  overflow-y: auto;
  padding: 12px 10px 24px;
  z-index: 20;
}

.nav-section { margin-bottom: 18px; }
.nav-section > h4 {
  font-size: 0.62rem;
  letter-spacing: 0.25em;
  color: var(--text-faint);
  text-transform: uppercase;
  margin: 0 6px 7px;
  font-weight: 600;
}

.mode-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-dim);
  font-family: var(--font-display);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  padding: 8px 10px;
  margin-bottom: 2px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}
.mode-btn .icon { font-size: 1rem; width: 20px; text-align: center; filter: grayscale(0.4); }
.mode-btn:hover { color: var(--text); background: var(--bg2); border-color: var(--line); }
.mode-btn.active {
  color: var(--cool);
  background: linear-gradient(90deg, rgba(45, 212, 206, 0.12), transparent);
  border-color: rgba(45, 212, 206, 0.35);
  box-shadow: inset 2px 0 0 var(--cool);
}
.mode-btn.active .icon { filter: none; }

.reactor-btn {
  display: flex;
  flex-direction: column;
  width: 100%;
  text-align: left;
  background: var(--bg1);
  border: 1px solid var(--line);
  color: var(--text-dim);
  padding: 7px 10px;
  margin-bottom: 4px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}
.reactor-btn b {
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--text);
  letter-spacing: 0.04em;
}
.reactor-btn small { font-size: 0.65rem; color: var(--text-faint); }
.reactor-btn:hover { border-color: var(--line-bright); background: var(--bg2); }
.reactor-btn.active {
  border-color: var(--cool);
  background: linear-gradient(90deg, rgba(45, 212, 206, 0.1), var(--bg2));
  box-shadow: var(--glow-cool);
}
.reactor-btn.active b { color: var(--cool); }
.reactor-btn .concept-tag {
  font-size: 0.55rem;
  color: var(--salt);
  letter-spacing: 0.12em;
  font-family: var(--font-mono);
}

.lens-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--text-dim);
  font-size: 0.76rem;
  padding: 7px 10px;
  margin-bottom: 4px;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-body);
}
.lens-toggle .sw {
  width: 30px; height: 16px; border-radius: 9px;
  background: var(--bg3);
  border: 1px solid var(--line-bright);
  position: relative;
  transition: background 0.2s;
  flex: 0 0 auto;
}
.lens-toggle .sw::after {
  content: ''; position: absolute; top: 1px; left: 2px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--text-faint);
  transition: all 0.2s;
}
.lens-toggle.on { color: var(--text); border-color: var(--line-bright); }
.lens-toggle.on .sw { background: rgba(45, 212, 206, 0.25); }
.lens-toggle.on .sw::after { left: 15px; background: var(--cool); box-shadow: 0 0 6px var(--cool); }
.lens-toggle.lens-temp.on .sw::after { background: var(--heat); box-shadow: 0 0 6px var(--heat); }
.lens-toggle.lens-temp.on .sw { background: rgba(255, 106, 42, 0.25); }
.lens-toggle.lens-rad.on .sw::after { background: var(--contain); box-shadow: 0 0 6px var(--contain); }
.lens-toggle.lens-rad.on .sw { background: rgba(139, 123, 255, 0.25); }

.seg {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 4px;
}
.seg button {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 0.7rem;
  font-family: var(--font-display);
  padding: 6px 4px;
  cursor: pointer;
  letter-spacing: 0.04em;
}
.seg button + button { border-left: 1px solid var(--line); }
.seg button.active { background: rgba(45, 212, 206, 0.14); color: var(--cool); }

.small-link-btn {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.76rem;
  padding: 5px 10px;
  cursor: pointer;
  border-radius: 5px;
}
.small-link-btn:hover { color: var(--cool); background: var(--bg2); }

/* ============ STAGE ============ */
.stage {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1200px 800px at 50% 30%, rgba(18, 28, 44, 0.6), transparent 70%),
    var(--bg0);
}
.stage-view { position: absolute; inset: 0; overflow: auto; }
.stage-view.centered { display: flex; align-items: center; justify-content: center; }

.stage canvas.fill, .stage svg.fill {
  width: 100%;
  height: 100%;
  display: block;
}

.stage-header {
  position: absolute;
  top: 12px;
  left: 16px;
  z-index: 5;
  pointer-events: none;
}
.stage-header h2 {
  font-size: 1rem;
  letter-spacing: 0.18em;
  color: var(--text);
  text-transform: uppercase;
  margin: 0;
  text-shadow: 0 0 20px rgba(45, 212, 206, 0.4);
}
.stage-header p {
  margin: 2px 0 0;
  font-size: 0.7rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.stage-tools {
  position: absolute;
  top: 12px;
  right: 16px;
  z-index: 6;
  display: flex;
  gap: 6px;
}

/* generic panel & buttons */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  backdrop-filter: blur(8px);
}

.btn {
  background: var(--bg2);
  border: 1px solid var(--line-bright);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  padding: 7px 13px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}
.btn:hover { border-color: var(--cool); color: var(--cool); box-shadow: var(--glow-cool); }
.btn.primary { border-color: var(--cool); color: var(--cool); background: rgba(45, 212, 206, 0.08); }
.btn.danger { border-color: var(--danger); color: var(--danger); background: rgba(255, 71, 87, 0.07); }
.btn.danger:hover { box-shadow: 0 0 14px rgba(255, 71, 87, 0.4); color: #ff7585; }
.btn.ghost { background: transparent; border-color: var(--line); color: var(--text-dim); }
.btn.ghost:hover { color: var(--cool); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; box-shadow: none; }
.btn.small { padding: 4px 9px; font-size: 0.66rem; }

/* SCRAM button */
.btn-scram {
  position: relative;
  background: radial-gradient(circle at 50% 35%, #471018, #2a070c);
  border: 2px solid var(--danger);
  color: #ff8493;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  padding: 12px 10px;
  border-radius: 8px;
  cursor: pointer;
  width: 100%;
  text-shadow: 0 0 8px rgba(255, 71, 87, 0.7);
  box-shadow: 0 0 16px rgba(255, 71, 87, 0.25), inset 0 0 22px rgba(255, 71, 87, 0.15);
  transition: all 0.12s;
}
.btn-scram:hover { box-shadow: 0 0 26px rgba(255, 71, 87, 0.5), inset 0 0 28px rgba(255, 71, 87, 0.25); }
.btn-scram:active { transform: scale(0.97); }
.btn-scram small { display: block; font-size: 0.55rem; letter-spacing: 0.1em; color: var(--text-dim); font-weight: 400; }

/* ============ DASHBOARD (right) ============ */
.dashboard {
  background: linear-gradient(180deg, var(--bg1), var(--bg0));
  border-left: 1px solid var(--line);
  overflow-y: auto;
  padding: 10px;
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dash-section h4 {
  font-size: 0.62rem;
  letter-spacing: 0.25em;
  color: var(--text-faint);
  text-transform: uppercase;
  margin: 0 0 6px 2px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.status-lights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
}
.light {
  border: 1px solid var(--line);
  background: var(--bg1);
  border-radius: 6px;
  padding: 5px 4px;
  text-align: center;
  font-size: 0.56rem;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.light .lamp {
  display: block;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  margin-bottom: 4px;
  background: var(--text-faint);
}
.light.ok .lamp { background: var(--safe); box-shadow: 0 0 8px var(--safe); }
.light.warn .lamp { background: var(--warn); box-shadow: 0 0 8px var(--warn); animation: blink 1.2s steps(2) infinite; }
.light.danger .lamp { background: var(--danger); box-shadow: 0 0 8px var(--danger); animation: blink 0.6s steps(2) infinite; }
body.reduced-motion .light .lamp { animation: none !important; }

.gauge-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}
.gauge {
  background: var(--bg1);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 6px 4px;
  position: relative;
  cursor: help;
}
.gauge:hover { border-color: var(--line-bright); }
.gauge svg { width: 100%; display: block; }
.gauge .g-label {
  font-size: 0.56rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  letter-spacing: 0.04em;
  text-align: center;
  line-height: 1.2;
  margin-top: 1px;
  text-transform: uppercase;
}
.gauge .g-value {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 600;
  text-align: center;
  color: var(--text);
}
.gauge .g-value small { font-size: 0.58rem; color: var(--text-faint); font-weight: 400; }
.gauge.warn .g-value { color: var(--warn); }
.gauge.danger .g-value { color: var(--danger); animation: blink 0.8s steps(2) infinite; }

.trend-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}
.trend {
  background: var(--bg1);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 5px 7px 3px;
}
.trend .t-label {
  font-size: 0.56rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.trend .t-label b { color: var(--text); }
.trend canvas { width: 100%; height: 34px; display: block; }

.alarm-feed {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 150px;
  overflow-y: auto;
}
.alarm-item {
  display: flex;
  gap: 8px;
  align-items: baseline;
  font-size: 0.7rem;
  padding: 5px 8px;
  border-radius: 5px;
  border: 1px solid var(--line);
  background: var(--bg1);
  font-family: var(--font-mono);
}
.alarm-item .t { color: var(--text-faint); font-size: 0.6rem; flex: 0 0 auto; }
.alarm-item.warn { border-color: rgba(255, 176, 32, 0.4); color: var(--warn); background: rgba(255, 176, 32, 0.05); }
.alarm-item.danger { border-color: rgba(255, 71, 87, 0.5); color: var(--danger); background: rgba(255, 71, 87, 0.06); }
.alarm-item.info { color: var(--text-dim); }
.alarm-empty { font-size: 0.7rem; color: var(--text-faint); font-style: italic; padding: 4px 8px; }

.workload-bar {
  height: 10px;
  border-radius: 5px;
  background: var(--bg3);
  border: 1px solid var(--line);
  overflow: hidden;
  position: relative;
}
.workload-bar .fill {
  height: 100%;
  width: 10%;
  background: linear-gradient(90deg, var(--safe), var(--warn) 60%, var(--danger));
  background-size: 280px 100%;
  background-position: left;
  transition: width 0.5s;
}

/* assistant */
.assistant {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(45, 212, 206, 0.05), var(--bg1));
  padding: 9px 10px;
}
.assistant h4 { margin-bottom: 5px !important; }
.assistant .narrative { font-size: 0.76rem; color: var(--text-dim); min-height: 40px; }
.assistant .narrative b { color: var(--text); }
.assistant-actions { display: flex; gap: 6px; margin-top: 7px; flex-wrap: wrap; }

.causal-chain { margin-top: 8px; display: flex; flex-direction: column; gap: 3px; }
.causal-node {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
}
.causal-node .arrow { color: var(--cool); }
.causal-node .delta-up { color: var(--heat-hi); }
.causal-node .delta-down { color: var(--cool); }

/* ============ BOTTOM BAR ============ */
.bottombar {
  display: grid;
  grid-template-columns: 320px 1fr 360px;
  gap: 12px;
  align-items: stretch;
  background: linear-gradient(0deg, var(--bg2), var(--bg1));
  border-top: 1px solid var(--line);
  padding: 9px 14px;
  z-index: 25;
}

.time-controls { display: flex; flex-direction: column; gap: 6px; justify-content: center; }
.time-controls .row { display: flex; align-items: center; gap: 6px; }
.sim-clock {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--cool);
  text-shadow: 0 0 12px rgba(45, 212, 206, 0.5);
  letter-spacing: 0.08em;
  min-width: 88px;
}
.speed-btn {
  background: var(--bg1);
  border: 1px solid var(--line);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  padding: 4px 8px;
  border-radius: 5px;
  cursor: pointer;
}
.speed-btn.active { border-color: var(--cool); color: var(--cool); background: rgba(45, 212, 206, 0.1); }
.speed-btn:hover { border-color: var(--line-bright); }

.timeline-zone { display: flex; flex-direction: column; justify-content: center; gap: 4px; min-width: 0; }
.timeline-label {
  font-size: 0.6rem;
  font-family: var(--font-mono);
  color: var(--text-faint);
  display: flex;
  justify-content: space-between;
  letter-spacing: 0.08em;
}
.scenario-progress {
  height: 8px;
  background: var(--bg3);
  border: 1px solid var(--line);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}
.scenario-progress .fill {
  height: 100%;
  background: linear-gradient(90deg, var(--cool-deep), var(--cool));
  width: 0%;
  transition: width 0.4s linear;
}
.scenario-progress .marker {
  position: absolute; top: -2px; width: 2px; height: 12px;
  background: var(--warn);
}

.event-log {
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg0);
  padding: 4px 8px;
}
.event-log .ev { color: var(--text-dim); padding: 1px 0; }
.event-log .ev .t { color: var(--text-faint); margin-right: 6px; }
.event-log .ev.warn { color: var(--warn); }
.event-log .ev.danger { color: var(--danger); }
.event-log .ev.good { color: var(--safe); }
.event-log .ev.action { color: var(--cool); }

/* ============ MODALS ============ */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(2, 5, 10, 0.78);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fade-in 0.2s;
}
@keyframes fade-in { from { opacity: 0; } }
.modal {
  width: min(860px, 92vw);
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  background: var(--panel-solid);
  border: 1px solid var(--line-bright);
  border-radius: 12px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.8), 0 0 40px rgba(45, 212, 206, 0.08);
  animation: modal-in 0.25s cubic-bezier(0.2, 0.9, 0.3, 1.2);
}
@keyframes modal-in { from { transform: translateY(18px) scale(0.97); opacity: 0; } }
body.reduced-motion .modal, body.reduced-motion .modal-backdrop { animation: none; }
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
}
.modal-head h3 { margin: 0; font-size: 1rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--cool); }
.modal-body { padding: 16px 20px; overflow-y: auto; }
.modal-body p { color: var(--text-dim); }
.modal-body p b, .modal-body li b { color: var(--text); }
.modal-close {
  background: none; border: 1px solid var(--line);
  color: var(--text-dim); border-radius: 6px;
  width: 30px; height: 30px; cursor: pointer; font-size: 0.9rem;
}
.modal-close:hover { color: var(--danger); border-color: var(--danger); }

/* info card (hotspot popover) */
.info-card {
  position: fixed;
  z-index: 90;
  width: 330px;
  max-height: 65vh;
  overflow-y: auto;
  background: var(--panel-solid);
  border: 1px solid var(--cool);
  border-radius: 10px;
  box-shadow: 0 14px 50px rgba(0, 0, 0, 0.7), var(--glow-cool);
  padding: 13px 15px;
  animation: modal-in 0.18s ease-out;
}
.info-card h3 {
  font-size: 0.88rem;
  letter-spacing: 0.1em;
  color: var(--cool);
  margin-bottom: 4px;
  text-transform: uppercase;
  padding-right: 26px;
}
.info-card .ic-close { position: absolute; top: 8px; right: 8px; }
.info-card .ic-level {
  font-size: 0.58rem;
  font-family: var(--font-mono);
  letter-spacing: 0.15em;
  color: var(--text-faint);
  text-transform: uppercase;
  margin-bottom: 6px;
}
.info-card p { font-size: 0.78rem; color: var(--text-dim); margin: 0 0 8px; }
.info-card .ic-value {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--heat-hi);
  border-top: 1px dashed var(--line);
  padding-top: 6px;
}
.info-card .approx-note { font-size: 0.6rem; color: var(--text-faint); font-style: italic; }

/* toasts */
#toast-root {
  position: fixed;
  bottom: calc(var(--bottom-h) + 14px);
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
  pointer-events: none;
}
.toast {
  background: var(--panel-solid);
  border: 1px solid var(--line-bright);
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 0.78rem;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.6);
  animation: toast-in 0.25s ease-out;
}
.toast.warn { border-color: var(--warn); color: var(--warn); }
.toast.danger { border-color: var(--danger); color: var(--danger); }
.toast.good { border-color: var(--safe); color: var(--safe); }
@keyframes toast-in { from { transform: translateY(10px); opacity: 0; } }

/* ============ CONTROLS PANEL ============ */
.controls-panel {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 10px;
}
.ctl {
  border: 1px solid var(--line);
  background: var(--bg1);
  border-radius: 7px;
  padding: 7px 9px;
}
.ctl-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-bottom: 4px;
}
.ctl-head .v { font-family: var(--font-mono); color: var(--cool); font-weight: 600; }
.ctl-head .info-i {
  border: 1px solid var(--line);
  background: none;
  color: var(--text-faint);
  width: 16px; height: 16px;
  border-radius: 50%;
  font-size: 0.58rem;
  cursor: pointer;
  line-height: 1;
  margin-left: 6px;
}
.ctl-head .info-i:hover { color: var(--cool); border-color: var(--cool); }
.ctl input[type="range"] {
  width: 100%;
  appearance: none;
  height: 5px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cool-deep), var(--cool));
  outline: none;
  cursor: pointer;
}
.ctl input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 15px; height: 15px;
  border-radius: 50%;
  background: var(--bg0);
  border: 2px solid var(--cool);
  box-shadow: 0 0 8px rgba(45, 212, 206, 0.6);
}
.ctl input[type="range"]:focus-visible::-webkit-slider-thumb { outline: 2px solid var(--text); }
.ctl input[type="range"]::-moz-range-thumb {
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--bg0);
  border: 2px solid var(--cool);
  box-shadow: 0 0 8px rgba(45, 212, 206, 0.6);
}
.ctl.heat input[type="range"] { background: linear-gradient(90deg, #5a2510, var(--heat)); }
.ctl.heat input[type="range"]::-webkit-slider-thumb { border-color: var(--heat); box-shadow: var(--glow-heat); }
.ctl .consequence {
  font-size: 0.6rem;
  color: var(--text-faint);
  margin-top: 3px;
  min-height: 12px;
  font-style: italic;
}
.ctl .consequence.warn { color: var(--warn); }

.ctl-toggle-row { display: flex; gap: 6px; }
.ctl-toggle {
  flex: 1;
  background: var(--bg1);
  border: 1px solid var(--line);
  color: var(--text-dim);
  font-size: 0.68rem;
  font-family: var(--font-display);
  padding: 8px 6px;
  border-radius: 6px;
  cursor: pointer;
  letter-spacing: 0.04em;
}
.ctl-toggle.on { border-color: var(--safe); color: var(--safe); background: rgba(61, 220, 132, 0.07); box-shadow: 0 0 10px rgba(61, 220, 132, 0.2); }
.ctl-toggle:hover { border-color: var(--line-bright); }

/* ============ SCENARIO ============ */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(255px, 1fr));
  gap: 14px;
  padding: 60px 26px 30px;
  max-width: 1200px;
  margin: 0 auto;
}
.scenario-card {
  background: linear-gradient(160deg, var(--bg2), var(--bg1));
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 15px;
  cursor: pointer;
  transition: all 0.18s;
  position: relative;
  overflow: hidden;
}
.scenario-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cool), transparent);
  opacity: 0;
  transition: opacity 0.2s;
}
.scenario-card:hover { border-color: var(--cool); transform: translateY(-3px); box-shadow: 0 10px 30px rgba(0,0,0,0.5), var(--glow-cool); }
.scenario-card:hover::before { opacity: 1; }
.scenario-card h3 { font-size: 0.9rem; letter-spacing: 0.06em; margin-bottom: 4px; }
.scenario-card .sc-num {
  font-family: var(--font-mono);
  color: var(--text-faint);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
}
.scenario-card p { font-size: 0.74rem; color: var(--text-dim); margin: 6px 0; }
.scenario-card .sc-meta { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  font-size: 0.56rem;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  padding: 2px 8px;
  border-radius: 99px;
  border: 1px solid var(--line-bright);
  color: var(--text-dim);
  text-transform: uppercase;
}
.chip.d1 { border-color: var(--safe); color: var(--safe); }
.chip.d2 { border-color: var(--warn); color: var(--warn); }
.chip.d3 { border-color: var(--danger); color: var(--danger); }
.chip.sel { cursor: pointer; }
.chip.sel.on { background: rgba(45, 212, 206, 0.15); border-color: var(--cool); color: var(--cool); }

.objectives-panel {
  position: absolute;
  left: 16px;
  bottom: 14px;
  z-index: 8;
  width: 290px;
  padding: 11px 13px;
}
.objectives-panel h4 {
  font-size: 0.64rem;
  letter-spacing: 0.2em;
  color: var(--cool);
  text-transform: uppercase;
  margin-bottom: 7px;
}
.objective {
  display: flex;
  gap: 8px;
  font-size: 0.72rem;
  color: var(--text-dim);
  padding: 3px 0;
  align-items: baseline;
}
.objective .tick {
  font-family: var(--font-mono);
  flex: 0 0 14px;
  color: var(--text-faint);
}
.objective.done { color: var(--safe); }
.objective.done .tick { color: var(--safe); }
.objective.failed { color: var(--danger); text-decoration: line-through; }

/* debrief */
.debrief-score {
  text-align: center;
  margin: 8px 0 18px;
}
.debrief-score .big {
  font-family: var(--font-display);
  font-size: 3.2rem;
  font-weight: 700;
  color: var(--cool);
  text-shadow: 0 0 30px rgba(45, 212, 206, 0.5);
  line-height: 1;
}
.debrief-score .grade { font-size: 0.8rem; letter-spacing: 0.3em; color: var(--text-dim); text-transform: uppercase; }
.score-bars { display: flex; flex-direction: column; gap: 7px; margin: 12px 0; }
.score-bar { display: grid; grid-template-columns: 170px 1fr 44px; align-items: center; gap: 10px; font-size: 0.74rem; }
.score-bar .bar { height: 8px; background: var(--bg3); border-radius: 4px; overflow: hidden; }
.score-bar .bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--cool-deep), var(--cool)); }
.score-bar .pc { font-family: var(--font-mono); color: var(--cool); text-align: right; }

/* briefing choice cards */
.choice-card {
  display: block;
  width: 100%;
  text-align: left;
  background: var(--bg1);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 14px;
  margin-bottom: 8px;
  color: var(--text-dim);
  font-size: 0.8rem;
  cursor: pointer;
  font-family: var(--font-body);
}
.choice-card:hover { border-color: var(--cool); color: var(--text); }
.choice-card.good-pick { border-color: var(--safe); background: rgba(61, 220, 132, 0.07); }
.choice-card.bad-pick { border-color: var(--danger); background: rgba(255, 71, 87, 0.06); }

/* ============ COMPARE ============ */
.compare-wrap { padding: 60px 26px 30px; max-width: 1280px; margin: 0 auto; }
.compare-pick { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.76rem;
}
.compare-table th, .compare-table td {
  border: 1px solid var(--line);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}
.compare-table th {
  background: var(--bg2);
  font-family: var(--font-display);
  letter-spacing: 0.06em;
  color: var(--cool);
  font-size: 0.78rem;
}
.compare-table td:first-child {
  background: var(--bg1);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.64rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}
.compare-table td { color: var(--text-dim); }
.compare-table td b { color: var(--text); }
.caveat-banner {
  border: 1px dashed rgba(255, 176, 32, 0.5);
  background: rgba(255, 176, 32, 0.05);
  color: var(--warn);
  font-size: 0.7rem;
  padding: 8px 12px;
  border-radius: 6px;
  margin-bottom: 14px;
}

/* ============ ENGINEER VIEW ============ */
.engineer-wrap {
  padding: 56px 22px 26px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  max-width: 1300px;
  margin: 0 auto;
}
.eng-panel { padding: 13px 15px; }
.eng-panel h3 {
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--cool);
  text-transform: uppercase;
  margin-bottom: 9px;
}
.state-table { width: 100%; font-family: var(--font-mono); font-size: 0.68rem; border-collapse: collapse; }
.state-table td { padding: 2.5px 6px; border-bottom: 1px solid rgba(27, 42, 63, 0.5); color: var(--text-dim); }
.state-table td:last-child { text-align: right; color: var(--cool); }
.eq-block {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  background: var(--bg0);
  border: 1px solid var(--line);
  border-left: 3px solid var(--heat);
  border-radius: 5px;
  padding: 7px 10px;
  margin-bottom: 7px;
  color: var(--text-dim);
  overflow-x: auto;
}
.eq-block .eq-name { color: var(--heat-hi); display: block; margin-bottom: 2px; }
.eq-block .eq-live { color: var(--cool); display: block; margin-top: 2px; }
.eng-graph { width: 100%; height: 150px; display: block; background: var(--bg0); border-radius: 6px; border: 1px solid var(--line); }
.dep-graph { width: 100%; background: var(--bg0); border-radius: 6px; border: 1px solid var(--line); }

/* ============ CLASSROOM ============ */
.classroom-wrap { padding: 60px 30px 30px; max-width: 980px; margin: 0 auto; }
.tabs { display: flex; gap: 4px; margin-bottom: 16px; flex-wrap: wrap; }
.tab-btn {
  background: var(--bg1);
  border: 1px solid var(--line);
  color: var(--text-dim);
  font-family: var(--font-display);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  padding: 7px 16px;
  border-radius: 6px 6px 0 0;
  cursor: pointer;
}
.tab-btn.active { color: var(--cool); border-color: var(--cool); border-bottom-color: transparent; background: var(--bg2); }
.classroom-body { min-height: 300px; }
.classroom-body ul { color: var(--text-dim); font-size: 0.85rem; }
.classroom-body li { margin-bottom: 6px; }

.quiz-card { padding: 18px 22px; margin-bottom: 14px; }
.quiz-card .q {
  font-size: 0.94rem;
  color: var(--text);
  margin-bottom: 12px;
  font-family: var(--font-display);
}
.quiz-opt {
  display: block;
  width: 100%;
  text-align: left;
  background: var(--bg1);
  border: 1px solid var(--line);
  color: var(--text-dim);
  padding: 9px 13px;
  margin-bottom: 6px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  font-family: var(--font-body);
}
.quiz-opt:hover:not(:disabled) { border-color: var(--cool); color: var(--text); }
.quiz-opt.correct { border-color: var(--safe); color: var(--safe); background: rgba(61, 220, 132, 0.08); }
.quiz-opt.wrong { border-color: var(--danger); color: var(--danger); background: rgba(255, 71, 87, 0.06); }
.quiz-feedback { font-size: 0.76rem; color: var(--text-dim); border-left: 3px solid var(--cool); padding: 4px 10px; margin-top: 8px; }
.quiz-progress { font-family: var(--font-mono); font-size: 0.66rem; color: var(--text-faint); margin-bottom: 8px; }

.vocab-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.vocab-item { padding: 9px 12px; }
.vocab-item b { color: var(--cool); font-family: var(--font-display); font-size: 0.8rem; letter-spacing: 0.04em; }
.vocab-item p { font-size: 0.72rem; color: var(--text-dim); margin: 3px 0 0; }

/* ============ GLOSSARY / LEARN MODAL ============ */
.glossary-search {
  width: 100%;
  background: var(--bg0);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.84rem;
  margin-bottom: 12px;
}
.glossary-search:focus { outline: none; border-color: var(--cool); box-shadow: var(--glow-cool); }
.gloss-entry { border-bottom: 1px solid var(--line); padding: 9px 2px; }
.gloss-entry b { color: var(--cool); font-family: var(--font-display); letter-spacing: 0.04em; }
.gloss-entry p { margin: 3px 0 0; font-size: 0.78rem; color: var(--text-dim); }

.misc-card {
  border: 1px solid var(--line);
  border-left: 3px solid var(--danger);
  border-radius: 6px;
  padding: 11px 14px;
  margin-bottom: 10px;
  background: var(--bg1);
}
.misc-card .myth { color: var(--danger); font-size: 0.82rem; font-style: italic; }
.misc-card .truth { color: var(--text-dim); font-size: 0.78rem; margin-top: 5px; }
.misc-card .truth b { color: var(--safe); font-style: normal; }

.timeline-list { position: relative; padding-left: 24px; }
.timeline-list::before {
  content: '';
  position: absolute;
  left: 7px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--cool), var(--contain));
}
.tl-item { position: relative; margin-bottom: 13px; }
.tl-item::before {
  content: '';
  position: absolute;
  left: -22px; top: 5px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--cool);
  box-shadow: 0 0 8px var(--cool);
}
.tl-item b { font-family: var(--font-mono); color: var(--cool); font-size: 0.74rem; }
.tl-item p { margin: 1px 0 0; font-size: 0.78rem; color: var(--text-dim); }

/* ============ REPLAY ============ */
.replay-wrap { padding: 60px 26px 20px; max-width: 1100px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.replay-graph { width: 100%; height: 300px; background: var(--bg0); border: 1px solid var(--line); border-radius: 8px; }
.replay-scrub { width: 100%; }
.replay-readouts { display: flex; gap: 10px; flex-wrap: wrap; }
.replay-readout {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 12px;
  color: var(--text-dim);
  background: var(--bg1);
}
.replay-readout b { color: var(--cool); display: block; font-size: 0.92rem; }

/* ============ DIAGRAM SVG ============ */
.diagram-svg text {
  font-family: var(--font-mono);
  fill: var(--text-dim);
  user-select: none;
}
.diagram-svg .lbl { font-size: 11px; letter-spacing: 0.04em; }
.diagram-svg .lbl-title { font-size: 13px; fill: var(--text); font-family: var(--font-display); letter-spacing: 0.1em; }
.diagram-svg .readout { font-size: 11px; fill: var(--heat-hi); font-weight: 600; }
.diagram-svg .readout.cool-val { fill: var(--cool); }
.diagram-svg .hotspot { cursor: pointer; }
.diagram-svg .hotspot circle.ring {
  fill: rgba(45, 212, 206, 0.07);
  stroke: var(--cool);
  stroke-width: 1.2;
  stroke-dasharray: 4 3;
  transition: all 0.2s;
}
.diagram-svg .hotspot:hover circle.ring { fill: rgba(45, 212, 206, 0.22); stroke-width: 2; }
.diagram-svg .hotspot .plus { fill: var(--cool); font-size: 13px; font-weight: 700; }
.diagram-svg .leader { stroke: var(--text-faint); stroke-width: 0.7; stroke-dasharray: 2 3; }

@keyframes dash-flow { to { stroke-dashoffset: -20; } }
body.reduced-motion .diagram-svg * { animation: none !important; }

/* explore canvas hints */
.explore-hint {
  position: absolute;
  bottom: 14px;
  right: 16px;
  z-index: 6;
  font-size: 0.66rem;
  font-family: var(--font-mono);
  color: var(--text-faint);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 11px;
  pointer-events: none;
}

/* settings */
.settings-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.84rem;
  color: var(--text-dim);
  gap: 14px;
}
.settings-row .desc { font-size: 0.68rem; color: var(--text-faint); }

/* tour */
.tour-tip {
  position: fixed;
  z-index: 300;
  width: 300px;
  background: var(--panel-solid);
  border: 1px solid var(--cool);
  border-radius: 10px;
  padding: 14px 16px;
  box-shadow: 0 0 0 4000px rgba(2, 5, 10, 0.6), var(--glow-cool);
}
.tour-tip h4 { color: var(--cool); font-size: 0.84rem; margin-bottom: 5px; }
.tour-tip p { font-size: 0.76rem; color: var(--text-dim); margin: 0 0 10px; }
.tour-tip .row { display: flex; justify-content: space-between; align-items: center; }
.tour-tip .step-count { font-family: var(--font-mono); font-size: 0.62rem; color: var(--text-faint); }

/* left drawer collapsed states for smaller screens */
@media (max-width: 1280px) {
  :root { --sidenav-w: 200px; --dash-w: 290px; }
}
@media (max-width: 1024px) {
  :root { --sidenav-w: 0px; --dash-w: 0px; --bottom-h: 100px; }
  .sidenav, .dashboard {
    position: fixed;
    top: var(--topbar-h);
    bottom: var(--bottom-h);
    width: 260px;
    transform: translateX(-100%);
    transition: transform 0.25s;
    z-index: 60;
  }
  .dashboard { right: 0; left: auto; transform: translateX(100%); }
  .sidenav.open { transform: none; width: 260px; }
  .dashboard.open { transform: none; width: 300px; }
  .drawer-toggles { display: flex !important; }
}
.drawer-toggles { display: none; gap: 6px; }

/* focus visibility for keyboard nav */
button:focus-visible, input:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--cool);
  outline-offset: 2px;
}

/* utility */
.muted { color: var(--text-faint); }
.hidden { display: none !important; }
.flex { display: flex; gap: 8px; align-items: center; }
.spacer { flex: 1; }
hr.thin { border: none; border-top: 1px solid var(--line); margin: 12px 0; }