:root {
  --bg: #04080c;
  --bg-soft: #081018;
  --panel: rgba(7, 13, 19, 0.82);
  --panel-deep: rgba(5, 10, 15, 0.9);
  --line: rgba(143, 186, 211, 0.14);
  --line-strong: rgba(145, 196, 224, 0.26);
  --text: #e4eef4;
  --text-soft: #b9c9d4;
  --muted: #7f95a4;
  --dim: #506573;
  --orange: #ff6b2c;
  --orange-hot: #ff8a4d;
  --orange-soft: rgba(255, 107, 44, 0.16);
  --cyan: #55ddff;
  --cyan-soft: rgba(85, 221, 255, 0.14);
  --yellow: #ffd166;
  --red: #ff453a;
  --green: #62f2b1;
  --font: "Bahnschrift", "DIN Alternate", "Arial Narrow", "Segoe UI", sans-serif;
  --mono: "Cascadia Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --radius: 3px;
}

* { box-sizing: border-box; }

html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  background:
    radial-gradient(120% 100% at 50% 0%, #0b1923 0%, #060c12 38%, #030608 100%);
  user-select: none;
}

body.modal-open { overflow: hidden; }

button,
input { font-family: inherit; }

button {
  color: inherit;
  cursor: pointer;
  border: 0;
  background: none;
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
input:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 3px;
}

svg {
  display: block;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.app {
  position: relative;
  width: 100vw;
  height: 100vh;
  min-height: 560px;
  overflow: hidden;
  isolation: isolate;
}

/* ------------------------------------------------------------------ */
/* Scene layers                                                       */
/* ------------------------------------------------------------------ */
.scene-layer {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

#stage {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  pointer-events: auto;
  touch-action: none;
  cursor: grab;
}

#stage:active { cursor: grabbing; }

.scene-glow {
  position: absolute;
  left: 50%;
  top: 48%;
  width: min(70vw, 1000px);
  aspect-ratio: 1.55;
  transform: translate(-50%, -50%);
  background:
    radial-gradient(ellipse at center, rgba(72, 146, 184, 0.09) 0%, rgba(20, 58, 82, 0.04) 35%, transparent 68%),
    radial-gradient(ellipse at 72% 80%, rgba(255, 92, 30, 0.06), transparent 55%);
  filter: blur(8px);
  mix-blend-mode: screen;
}

.vignette {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 50% 46%, transparent 38%, rgba(2, 5, 8, 0.36) 78%, rgba(2, 4, 6, 0.82) 100%),
    linear-gradient(to bottom, rgba(2, 5, 8, 0.6) 0%, transparent 18%, transparent 72%, rgba(2, 5, 8, 0.68) 100%);
  pointer-events: none;
}

.scanlines {
  position: absolute;
  inset: 0;
  opacity: 0.15;
  background: repeating-linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.035) 0,
    rgba(255, 255, 255, 0.035) 1px,
    transparent 1px,
    transparent 4px
  );
  mix-blend-mode: soft-light;
  pointer-events: none;
}

.grain {
  position: absolute;
  inset: -50%;
  opacity: 0.035;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 220 220' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain-shift 0.6s steps(2) infinite;
}

@keyframes grain-shift {
  0% { transform: translate(0, 0); }
  25% { transform: translate(-2%, 1%); }
  50% { transform: translate(1%, -2%); }
  75% { transform: translate(2%, 2%); }
  100% { transform: translate(0, 0); }
}

/* ------------------------------------------------------------------ */
/* Top bar                                                            */
/* ------------------------------------------------------------------ */
.topbar {
  position: absolute;
  z-index: 30;
  top: 0;
  left: 0;
  right: 0;
  height: 92px;
  padding: 0 24px;
  display: grid;
  grid-template-columns: minmax(260px, 1fr) auto minmax(260px, 1fr);
  align-items: center;
  gap: 22px;
  pointer-events: none;
  background: linear-gradient(to bottom, rgba(3, 7, 11, 0.86), rgba(3, 7, 11, 0.42) 58%, transparent);
}

.topbar > * { pointer-events: auto; }

.brand {
  display: flex;
  align-items: center;
  gap: 13px;
  color: var(--text);
  text-decoration: none;
  min-width: 0;
}

.brand-mark {
  position: relative;
  width: 50px;
  height: 50px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 107, 44, 0.55);
  background:
    linear-gradient(135deg, rgba(255, 107, 44, 0.16), transparent 60%),
    rgba(8, 14, 20, 0.62);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}

.brand-mark::before {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid rgba(147, 197, 222, 0.14);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}

.brand-v {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -1.5px;
  color: var(--orange);
  text-shadow: 0 0 16px rgba(255, 107, 44, 0.6);
}

.brand-ring {
  position: absolute;
  right: 6px;
  bottom: 5px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.brand-kicker,
.brand-sub {
  font-family: var(--mono);
  font-size: 7.5px;
  letter-spacing: 0.24em;
  color: var(--dim);
  white-space: nowrap;
}

.brand-title {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.13em;
  line-height: 1;
  white-space: nowrap;
}

.brand-title b {
  color: var(--orange);
  font-weight: 700;
}

.brand-sub { color: var(--muted); letter-spacing: 0.18em; }

.mode-tabs {
  position: relative;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  background: rgba(6, 12, 18, 0.7);
  border: 1px solid var(--line);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 18px 46px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.mode-tabs::before,
.mode-tabs::after {
  content: "";
  position: absolute;
  width: 6px;
  height: 6px;
  border-color: rgba(255, 107, 44, 0.7);
  border-style: solid;
  pointer-events: none;
}

.mode-tabs::before {
  left: -1px;
  top: -1px;
  border-width: 1px 0 0 1px;
}

.mode-tabs::after {
  right: -1px;
  bottom: -1px;
  border-width: 0 1px 1px 0;
}

.mode-btn {
  position: relative;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 14px;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--muted);
  transition: color 180ms ease, background 180ms ease;
}

.mode-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.5;
  transition: all 180ms ease;
}

.mode-btn:hover { color: var(--text-soft); }

.mode-btn.is-active {
  color: var(--text);
  background: linear-gradient(180deg, rgba(255, 107, 44, 0.16), rgba(255, 107, 44, 0.03));
  box-shadow: inset 0 -1px 0 rgba(255, 107, 44, 0.72);
}

.mode-btn.is-active .mode-dot {
  opacity: 1;
  background: var(--orange);
  box-shadow: 0 0 8px var(--orange);
}

.top-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 7px;
}

.icon-btn {
  height: 34px;
  min-width: 34px;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: 1px solid var(--line);
  background: rgba(7, 13, 19, 0.55);
  color: var(--muted);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: border-color 180ms ease, color 180ms ease, background 180ms ease;
}

.icon-btn svg { width: 15px; height: 15px; stroke-width: 1.6; }

.icon-btn .btn-label {
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.13em;
  white-space: nowrap;
}

.icon-btn:hover {
  color: var(--text);
  border-color: var(--line-strong);
  background: rgba(16, 26, 36, 0.7);
}

.icon-btn.is-on {
  color: var(--orange);
  border-color: rgba(255, 107, 44, 0.38);
  background: rgba(255, 107, 44, 0.08);
}

#btnLabels.is-on { color: var(--cyan); border-color: rgba(85, 221, 255, 0.3); background: rgba(85, 221, 255, 0.06); }

/* ------------------------------------------------------------------ */
/* Specification rail                                                 */
/* ------------------------------------------------------------------ */
.spec-rail {
  position: absolute;
  z-index: 20;
  left: 24px;
  top: 118px;
  width: 206px;
  padding-left: 15px;
  border-left: 1px solid rgba(255, 107, 44, 0.4);
  pointer-events: none;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.8);
}

.spec-rail::before {
  content: "";
  position: absolute;
  left: -2px;
  top: 0;
  width: 3px;
  height: 44px;
  background: linear-gradient(to bottom, var(--orange), transparent);
}

.spec-topline {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.18em;
  color: var(--dim);
  padding-bottom: 9px;
  border-bottom: 1px solid var(--line);
}

.spec-hero {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  margin: 13px 0 3px;
}

.spec-v {
  font-size: 58px;
  line-height: 0.8;
  font-weight: 700;
  letter-spacing: -0.07em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(215, 234, 244, 0.65);
  text-shadow: 0 0 30px rgba(85, 221, 255, 0.12);
}

.spec-displacement {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--orange);
  line-height: 1;
  margin-bottom: 2px;
}

.spec-displacement small { font-size: 9px; color: var(--muted); margin-left: 1px; }

.spec-overline {
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-bottom: 16px;
}

.spec-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.spec-grid > div {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 8px 7px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(6, 12, 18, 0.28);
}

.spec-grid strong {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-soft);
  letter-spacing: -0.03em;
}

.spec-grid strong small { font-size: 7px; color: var(--muted); margin-left: 1px; }

.spec-grid span {
  font-size: 6.5px;
  letter-spacing: 0.16em;
  color: var(--dim);
}

.spec-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 10px;
  margin-top: 14px;
}

.spec-legend span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--mono);
  font-size: 6.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.legend-dot { width: 4px; height: 4px; border-radius: 50%; display: inline-block; }
.legend-dot.intake { background: var(--cyan); box-shadow: 0 0 6px var(--cyan); }
.legend-dot.exhaust { background: var(--orange); box-shadow: 0 0 6px var(--orange); }
.legend-dot.spark { background: var(--yellow); box-shadow: 0 0 6px var(--yellow); }

.spec-note {
  margin-top: 15px;
  padding-top: 9px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 7px;
  line-height: 1.9;
  letter-spacing: 0.05em;
  color: var(--dim);
}

/* ------------------------------------------------------------------ */
/* Control panel                                                      */
/* ------------------------------------------------------------------ */
.control-panel {
  position: absolute;
  z-index: 25;
  top: 108px;
  right: 22px;
  width: 304px;
  max-height: calc(100vh - 330px);
  overflow: auto;
  scrollbar-width: none;
  padding: 14px 14px 12px;
  background:
    linear-gradient(145deg, rgba(20, 33, 45, 0.42), transparent 34%),
    var(--panel);
  border: 1px solid var(--line);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.035);
  backdrop-filter: blur(22px) saturate(115%);
  -webkit-backdrop-filter: blur(22px) saturate(115%);
  clip-path: polygon(0 0, calc(100% - 13px) 0, 100% 13px, 100% 100%, 0 100%);
}

.control-panel::-webkit-scrollbar { display: none; }

.control-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 13px;
  height: 1px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 107, 44, 0.06) 55%, transparent);
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.panel-close {
  display: none;
  position: absolute;
  z-index: 3;
  top: 7px;
  right: 8px;
  width: 22px;
  height: 22px;
  place-items: center;
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1;
  color: var(--muted);
  border: 1px solid var(--line);
  background: rgba(5, 10, 15, 0.7);
}

.panel-close:hover { color: var(--orange); border-color: rgba(255, 107, 44, 0.4); }

.panel-kicker {
  font-family: var(--mono);
  font-size: 7.5px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.status-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.13em;
  color: var(--text-soft);
}

.status-led {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--dim);
  box-shadow: 0 0 0 transparent;
  transition: all 200ms ease;
}

.status-led.running { background: var(--green); box-shadow: 0 0 8px var(--green); animation: led-breathe 2.2s ease-in-out infinite; }
.status-led.cranking { background: var(--yellow); box-shadow: 0 0 9px var(--yellow); animation: led-blink 0.24s steps(2) infinite; }

@keyframes led-breathe { 0%, 100% { opacity: 0.55; } 50% { opacity: 1; } }
@keyframes led-blink { 0% { opacity: 1; } 50% { opacity: 0.2; } }

.start-button {
  position: relative;
  width: 100%;
  height: 58px;
  margin: 12px 0 15px;
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 0 12px;
  overflow: hidden;
  background:
    linear-gradient(100deg, rgba(255, 107, 44, 0.94), rgba(222, 67, 13, 0.96));
  color: #170a04;
  border: 1px solid rgba(255, 160, 110, 0.55);
  box-shadow: 0 10px 30px rgba(255, 78, 15, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.28);
  transition: filter 180ms ease, transform 180ms ease, background 260ms ease;
}

.start-button::before {
  content: "";
  position: absolute;
  top: -40%;
  left: -30%;
  width: 30%;
  height: 180%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.42), transparent);
  transform: skewX(-20deg);
  animation: start-sheen 4.8s ease-in-out infinite;
}

@keyframes start-sheen {
  0%, 62% { left: -40%; opacity: 0; }
  70% { opacity: 0.7; }
  86%, 100% { left: 125%; opacity: 0; }
}

.start-button:hover { filter: brightness(1.09); }
.start-button:active { transform: translateY(1px); }

.start-icon {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1px solid rgba(23, 10, 4, 0.28);
  border-radius: 50%;
}

.start-icon svg { width: 17px; height: 17px; fill: currentColor; stroke: none; }

.start-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  min-width: 0;
}

.start-copy > span {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1;
}

.start-copy small {
  font-family: var(--mono);
  font-size: 6.5px;
  letter-spacing: 0.16em;
  opacity: 0.62;
}

.start-key {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 6px;
  letter-spacing: 0.1em;
  padding: 3px 5px;
  border: 1px solid rgba(23, 10, 4, 0.25);
  opacity: 0.62;
}

.start-button.is-running {
  background: linear-gradient(100deg, rgba(25, 42, 54, 0.95), rgba(14, 25, 34, 0.98));
  color: var(--text);
  border-color: rgba(255, 107, 44, 0.38);
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.32), inset 0 0 26px rgba(255, 107, 44, 0.06);
}

.start-button.is-running .start-icon {
  border-color: rgba(255, 107, 44, 0.4);
  color: var(--orange);
}

.start-button.is-running .start-key { border-color: rgba(255, 255, 255, 0.16); }

.start-button.is-cranking { border-color: rgba(255, 209, 102, 0.5); }
.start-button.is-cranking .start-icon { animation: cranking-pulse 0.22s steps(2) infinite; color: var(--yellow); border-color: rgba(255, 209, 102, 0.5); }

@keyframes cranking-pulse { 50% { transform: scale(0.88); opacity: 0.6; } }

.control-row { margin-bottom: 12px; }

.control-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 7px;
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.15em;
  color: var(--muted);
}

.control-label output {
  font-size: 9px;
  color: var(--orange);
  letter-spacing: 0.04em;
}

.range {
  --range-progress: 8%;
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 16px;
  background: transparent;
  cursor: ew-resize;
}

.range::-webkit-slider-runnable-track {
  height: 3px;
  background: linear-gradient(
    90deg,
    rgba(255, 107, 44, 0.98) 0%,
    rgba(255, 128, 62, 0.92) var(--range-progress),
    rgba(143, 186, 211, 0.18) var(--range-progress),
    rgba(143, 186, 211, 0.13) 100%
  );
  border-radius: 0;
  box-shadow: 0 0 10px rgba(255, 107, 44, 0.14);
}

.range::-moz-range-track {
  height: 3px;
  background: linear-gradient(
    90deg,
    rgba(255, 107, 44, 0.98) 0%,
    rgba(255, 128, 62, 0.92) var(--range-progress),
    rgba(143, 186, 211, 0.18) var(--range-progress),
    rgba(143, 186, 211, 0.13) 100%
  );
  border: none;
}

.range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 11px;
  height: 15px;
  margin-top: -6px;
  background: var(--orange);
  border: 1px solid rgba(255, 210, 184, 0.7);
  border-radius: 1px;
  box-shadow: 0 0 12px rgba(255, 107, 44, 0.6);
}

.range::-moz-range-thumb {
  width: 11px;
  height: 15px;
  background: var(--orange);
  border: 1px solid rgba(255, 210, 184, 0.7);
  border-radius: 1px;
  box-shadow: 0 0 12px rgba(255, 107, 44, 0.6);
}

.range-scale {
  display: flex;
  justify-content: space-between;
  margin-top: 2px;
  font-family: var(--mono);
  font-size: 6px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

.panel-section {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.section-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 7px;
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.section-hint { font-size: 6px; color: var(--dim); letter-spacing: 0.12em; }

.segmented {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  padding: 2px;
  background: rgba(4, 9, 13, 0.6);
  border: 1px solid var(--line);
}

.segmented button {
  padding: 6px 2px;
  font-family: var(--mono);
  font-size: 7.5px;
  letter-spacing: 0.03em;
  color: var(--muted);
  border: 1px solid transparent;
  transition: all 150ms ease;
}

.segmented button:hover { color: var(--text); background: rgba(255, 255, 255, 0.035); }

.segmented button.active {
  color: var(--orange);
  background: rgba(255, 107, 44, 0.11);
  border-color: rgba(255, 107, 44, 0.24);
}

.switch-list {
  margin-top: 10px;
  border-top: 1px solid var(--line);
}

.switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 7px 0;
  border-bottom: 1px solid rgba(143, 186, 211, 0.07);
  font-family: var(--mono);
  font-size: 6.8px;
  letter-spacing: 0.1em;
  color: var(--muted);
  cursor: pointer;
}

.switch-row:hover { color: var(--text-soft); }

.switch-row input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.switch-row i {
  position: relative;
  width: 27px;
  height: 13px;
  flex: 0 0 auto;
  border: 1px solid rgba(143, 186, 211, 0.26);
  background: rgba(2, 6, 9, 0.7);
  transition: all 160ms ease;
}

.switch-row i::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 7px;
  height: 7px;
  background: var(--dim);
  transition: all 160ms ease;
}

.switch-row input:checked + i {
  border-color: rgba(255, 107, 44, 0.5);
  background: rgba(255, 107, 44, 0.12);
}

.switch-row input:checked + i::after {
  left: 16px;
  background: var(--orange);
  box-shadow: 0 0 8px rgba(255, 107, 44, 0.8);
}

.camera-section { margin-top: 9px; }

.camera-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 3px;
}

.cam-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 7px 2px 5px;
  border: 1px solid var(--line);
  background: rgba(5, 10, 15, 0.4);
  color: var(--dim);
  transition: all 160ms ease;
}

.cam-btn svg { width: 15px; height: 15px; }
.cam-btn span { font-family: var(--mono); font-size: 5.8px; letter-spacing: 0.1em; }
.cam-btn:hover { color: var(--text-soft); border-color: var(--line-strong); }

.cam-btn.is-active {
  color: var(--cyan);
  border-color: rgba(85, 221, 255, 0.28);
  background: rgba(85, 221, 255, 0.06);
}

.utility-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 3px;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.util-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 7px 2px;
  border: 1px solid var(--line);
  color: var(--dim);
  background: rgba(4, 9, 13, 0.36);
  transition: all 160ms ease;
}

.util-btn svg { width: 12px; height: 12px; }
.util-btn .btn-label { font-family: var(--mono); font-size: 5.8px; letter-spacing: 0.08em; }
.util-btn:hover { color: var(--text-soft); border-color: var(--line-strong); }
.util-btn.is-on { color: var(--yellow); border-color: rgba(255, 209, 102, 0.3); background: rgba(255, 209, 102, 0.07); }

/* ------------------------------------------------------------------ */
/* Scene annotations                                                  */
/* ------------------------------------------------------------------ */
.labels-layer {
  position: absolute;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  transition: opacity 250ms ease;
}

.labels-layer.is-hidden,
.labels-layer.is-user-hidden {
  opacity: 0;
  visibility: hidden;
}
.labels-layer.is-hidden .hotspot { pointer-events: none; }
.labels-layer.is-user-hidden .hotspot { pointer-events: none; }

.hotspot {
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  align-items: center;
  padding: 0;
  color: var(--text);
  pointer-events: auto;
  transform-origin: 0 0;
  opacity: 0;
  animation: hotspot-in 480ms ease forwards;
}

.hotspot:nth-child(2) { animation-delay: 70ms; }
.hotspot:nth-child(3) { animation-delay: 140ms; }
.hotspot:nth-child(4) { animation-delay: 210ms; }

@keyframes hotspot-in { to { opacity: 1; } }

.hotspot.is-behind { opacity: 0.18 !important; pointer-events: none; }

.hotspot-dot {
  position: relative;
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 107, 44, 0.12), 0 0 14px rgba(255, 107, 44, 0.8);
}

.hotspot-dot::after {
  content: "";
  position: absolute;
  inset: -6px;
  border: 1px solid rgba(255, 107, 44, 0.35);
  border-radius: 50%;
  animation: hotspot-ping 2.6s ease-out infinite;
}

@keyframes hotspot-ping {
  0% { transform: scale(0.4); opacity: 0; }
  30% { opacity: 0.8; }
  100% { transform: scale(1.5); opacity: 0; }
}

.hotspot-line {
  width: 34px;
  height: 1px;
  flex: 0 0 auto;
  background: linear-gradient(90deg, rgba(255, 107, 44, 0.7), rgba(255, 107, 44, 0.15));
  transform-origin: left center;
  transform: rotate(-16deg);
}

.hotspot-right .hotspot-line {
  background: linear-gradient(90deg, rgba(255, 107, 44, 0.15), rgba(255, 107, 44, 0.7));
  transform: rotate(18deg);
}

.hotspot-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  margin-left: -8px;
  padding: 5px 9px 5px 11px;
  background: linear-gradient(110deg, rgba(6, 12, 18, 0.82), rgba(6, 12, 18, 0.38));
  border: 1px solid rgba(143, 186, 211, 0.13);
  border-left: 1px solid rgba(255, 107, 44, 0.55);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  text-align: left;
  opacity: 0.92;
  transition: border-color 180ms ease, background 180ms ease, padding 180ms ease;
}

.hotspot:hover .hotspot-copy {
  border-color: rgba(255, 107, 44, 0.5);
  background: linear-gradient(110deg, rgba(10, 19, 27, 0.95), rgba(8, 15, 22, 0.65));
}

.hotspot-index {
  font-family: var(--mono);
  font-size: 6px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.hotspot-copy b {
  font-size: 7px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--text);
  white-space: nowrap;
}

.hotspot-copy small {
  display: none;
  font-family: var(--mono);
  font-size: 5.7px;
  letter-spacing: 0.04em;
  color: var(--dim);
  white-space: nowrap;
}

.hotspot:hover .hotspot-copy {
  padding-bottom: 6px;
}

.hotspot:hover .hotspot-copy small { display: block; }

.hotspot-right {
  flex-direction: row-reverse;
  transform: translate(-100%, -50%);
}

.hotspot-right .hotspot-line {
  transform-origin: right center;
}

.hotspot-right .hotspot-copy {
  margin-left: 0;
  margin-right: -8px;
  padding: 5px 11px 5px 9px;
  border-left: 1px solid rgba(143, 186, 211, 0.13);
  border-right: 1px solid rgba(255, 107, 44, 0.55);
  text-align: right;
}

.hotspot-left { transform: translate(0, -50%); }

.scene-caption {
  position: absolute;
  z-index: 12;
  left: 24px;
  bottom: 208px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 6.5px;
  letter-spacing: 0.16em;
  color: var(--dim);
  pointer-events: none;
}

.caption-line { width: 22px; height: 1px; background: var(--orange); }
.caption-sep { color: rgba(255, 107, 44, 0.5); }

/* ------------------------------------------------------------------ */
/* Dashboard                                                          */
/* ------------------------------------------------------------------ */
.dashboard {
  position: absolute;
  z-index: 22;
  left: 50%;
  bottom: 18px;
  width: min(1180px, calc(100vw - 44px));
  min-height: 166px;
  transform: translateX(-50%);
  display: grid;
  grid-template-columns: 172px minmax(340px, 1fr) 326px;
  gap: 16px;
  padding: 12px 18px 11px;
  background:
    linear-gradient(120deg, rgba(24, 42, 56, 0.36), transparent 26%),
    linear-gradient(180deg, rgba(8, 14, 20, 0.92), rgba(4, 9, 13, 0.9));
  border: 1px solid rgba(143, 186, 211, 0.16);
  box-shadow: 0 -18px 80px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(24px) saturate(115%);
  -webkit-backdrop-filter: blur(24px) saturate(115%);
  clip-path: polygon(13px 0, 100% 0, 100% calc(100% - 13px), calc(100% - 13px) 100%, 0 100%, 0 13px);
}

.dashboard::before {
  content: "";
  position: absolute;
  top: 0;
  left: 13px;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 107, 44, 0.18) 12%, rgba(143, 186, 211, 0.1) 40%, transparent 75%);
}

.dashboard::after {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  width: 1px;
  height: 28px;
  background: var(--orange);
}

.gauge-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 142px;
  border-right: 1px solid var(--line);
}

.rpm-gauge {
  position: absolute;
  width: 154px;
  height: 154px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  overflow: visible;
}

.gauge-track {
  fill: none;
  stroke: rgba(155, 194, 217, 0.13);
  stroke-width: 5;
  stroke-linecap: butt;
}

.gauge-arc {
  fill: none;
  stroke: url("#rpmGrad");
  stroke-width: 5;
  stroke-linecap: round;
  stroke-dasharray: 0 999;
  transition: stroke-dasharray 80ms linear;
}

.gauge-arc.redline { stroke: #ff5a33; filter: drop-shadow(0 0 5px rgba(255, 70, 30, 0.8)); }

.tick { stroke: rgba(164, 201, 222, 0.24); stroke-width: 0.8; }
.tick.major { stroke: rgba(203, 231, 244, 0.55); stroke-width: 1.1; }
.tick-label {
  fill: var(--dim);
  stroke: none;
  font-family: var(--mono);
  font-size: 6.5px;
  text-anchor: middle;
}

.rpm-needle {
  transform-origin: 100px 100px;
  transition: transform 80ms linear;
}

.rpm-needle line {
  stroke: var(--orange);
  stroke-width: 1.6;
  filter: drop-shadow(0 0 3px rgba(255, 107, 44, 0.9));
}

.rpm-needle circle { fill: var(--orange); stroke: none; }

.gauge-hub {
  fill: rgba(4, 8, 11, 0.95);
  stroke: rgba(143, 186, 211, 0.28);
  stroke-width: 1;
}

.gauge-hub-inner { fill: var(--orange); stroke: none; }

.rpm-readout {
  position: absolute;
  left: 50%;
  top: 54%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  pointer-events: none;
}

.rpm-number {
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 500;
  letter-spacing: -0.08em;
  line-height: 1;
  color: var(--text);
  text-shadow: 0 0 20px rgba(85, 221, 255, 0.15);
  font-variant-numeric: tabular-nums;
}

.rpm-caption {
  font-family: var(--mono);
  font-size: 6px;
  letter-spacing: 0.18em;
  color: var(--dim);
}

.gear-badge {
  position: absolute;
  right: 4px;
  bottom: 2px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  padding: 4px 6px;
  border: 1px solid rgba(143, 186, 211, 0.16);
  background: rgba(4, 9, 13, 0.55);
}

.gear-badge b {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--orange);
  line-height: 1;
}

.gear-badge span {
  font-family: var(--mono);
  font-size: 5px;
  letter-spacing: 0.14em;
  color: var(--dim);
}

.dash-main {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.metric {
  position: relative;
  padding: 7px 10px 7px 0;
  min-width: 0;
}

.metric + .metric {
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

.metric-label {
  display: block;
  font-family: var(--mono);
  font-size: 6px;
  letter-spacing: 0.15em;
  color: var(--dim);
  margin-bottom: 2px;
}

.metric-value {
  display: flex;
  align-items: baseline;
  gap: 3px;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.metric-value strong {
  font-size: 21px;
  font-weight: 500;
  letter-spacing: -0.05em;
  color: var(--text);
  line-height: 1;
}

.metric-value em {
  font-size: 6.5px;
  font-style: normal;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.metric-spark {
  position: absolute;
  right: 0;
  top: 8px;
  width: 2px;
  height: 4px;
  background: var(--orange);
  opacity: 0.28;
}

.cycle-block { margin-top: 9px; }

.cycle-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 5px;
}

.cycle-title {
  font-family: var(--mono);
  font-size: 6.5px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

.cycle-title b { color: var(--text-soft); font-weight: 500; }

.stroke-name {
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.13em;
  padding: 2px 5px;
  border: 1px solid currentColor;
  opacity: 0.92;
}

.stroke-name.intake { color: var(--cyan); background: rgba(85, 221, 255, 0.08); }
.stroke-name.compression { color: var(--yellow); background: rgba(255, 209, 102, 0.07); }
.stroke-name.power { color: var(--orange); background: rgba(255, 107, 44, 0.1); }
.stroke-name.exhaust { color: #b48bff; background: rgba(180, 139, 255, 0.08); }

.cycle-deg {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.04em;
  color: var(--text-soft);
  font-variant-numeric: tabular-nums;
}

.cycle-track {
  position: relative;
  display: flex;
  height: 7px;
  overflow: visible;
  background: rgba(3, 7, 10, 0.7);
  border: 1px solid rgba(143, 186, 211, 0.09);
}

.cycle-seg { height: 100%; opacity: 0.19; }
.cycle-seg.intake { background: var(--cyan); }
.cycle-seg.compression { background: var(--yellow); }
.cycle-seg.power { background: var(--orange); }
.cycle-seg.exhaust { background: #a97dff; }

.cycle-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, rgba(85, 221, 255, 0.45), rgba(255, 209, 102, 0.4) 42%, rgba(255, 107, 44, 0.55) 70%, rgba(169, 125, 255, 0.45));
  mix-blend-mode: screen;
  pointer-events: none;
}

.cycle-marker {
  position: absolute;
  top: -3px;
  left: 0;
  width: 1px;
  height: 13px;
  background: var(--text);
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.75);
  transition: left 80ms linear;
  pointer-events: none;
}

.cycle-marker i {
  position: absolute;
  left: -3px;
  top: -2px;
  width: 7px;
  height: 4px;
  background: var(--text);
  clip-path: polygon(50% 100%, 0 0, 100% 0);
}

.cycle-labels {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 4px;
}

.cycle-labels span {
  font-family: var(--mono);
  font-size: 5.4px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

.cycle-labels span:nth-child(2),
.cycle-labels span:nth-child(3) { text-align: center; }
.cycle-labels span:last-child { text-align: right; }

.valve-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 12px;
  align-items: end;
  margin-top: 8px;
}

.valve-meter label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 3px;
  font-family: var(--mono);
  font-size: 5.8px;
  letter-spacing: 0.12em;
  color: var(--dim);
}

.valve-meter label span { color: var(--text-soft); }

.valve-bar {
  height: 3px;
  background: rgba(143, 186, 211, 0.1);
  overflow: hidden;
}

.valve-bar i {
  display: block;
  height: 100%;
  width: 0;
  transition: height 60ms linear;
}

.valve-bar i.intake { background: var(--cyan); box-shadow: 0 0 8px var(--cyan); }
.valve-bar i.exhaust { background: var(--orange); box-shadow: 0 0 8px var(--orange); }

.state-stack {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 3px;
  min-width: 105px;
  font-family: var(--mono);
  font-size: 5.8px;
  letter-spacing: 0.1em;
  color: var(--dim);
}

.state-stack > span:first-child { display: flex; gap: 5px; align-items: center; }

.state-value { color: var(--muted); font-weight: 500; }
.state-value.good { color: var(--green); }
.state-value.spark { color: var(--yellow); text-shadow: 0 0 8px rgba(255, 209, 102, 0.6); }

.valve-note {
  font-size: 5.2px;
  color: var(--dim);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.firing-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.firing-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 6px;
}

.firing-head > span:first-child {
  font-family: var(--mono);
  font-size: 6.5px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.firing-sequence {
  font-family: var(--mono);
  font-size: 6.5px;
  letter-spacing: 0.03em;
  color: var(--orange);
  white-space: nowrap;
}

.firing-order {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
}

.fire-chip {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-width: 0;
  height: 52px;
  border: 1px solid rgba(143, 186, 211, 0.12);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.025), transparent),
    rgba(4, 9, 13, 0.48);
  color: var(--muted);
  transition: border-color 130ms ease, color 130ms ease, background 130ms ease;
}

.fire-chip .fire-index {
  font-family: var(--mono);
  font-size: 4.6px;
  letter-spacing: 0.05em;
  color: var(--dim);
  line-height: 1;
}

.fire-chip b {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
  color: var(--text-soft);
}

.fire-chip i {
  width: 10px;
  height: 2px;
  background: rgba(143, 186, 211, 0.2);
  transition: all 130ms ease;
}

.fire-chip:hover { border-color: var(--line-strong); color: var(--text); }

.fire-chip.is-focus {
  border-color: rgba(85, 221, 255, 0.42);
  background: rgba(85, 221, 255, 0.055);
}

.fire-chip.is-focus b { color: var(--cyan); }

.fire-chip.is-active {
  border-color: rgba(255, 107, 44, 0.7);
  background:
    linear-gradient(180deg, rgba(255, 107, 44, 0.2), rgba(255, 107, 44, 0.03)),
    rgba(10, 13, 15, 0.55);
  box-shadow: inset 0 0 18px rgba(255, 107, 44, 0.1), 0 0 12px rgba(255, 95, 28, 0.08);
}

.fire-chip.is-active b { color: var(--orange-hot); text-shadow: 0 0 10px rgba(255, 107, 44, 0.5); }
.fire-chip.is-active .fire-index { color: var(--orange); }
.fire-chip.is-active i { background: var(--orange); box-shadow: 0 0 7px var(--orange); }

.fire-chip.is-firing::after {
  content: "";
  position: absolute;
  inset: -1px;
  border: 1px solid rgba(255, 107, 44, 0.5);
  animation: chip-fire 0.45s ease-out infinite;
}

@keyframes chip-fire {
  0% { opacity: 0.8; transform: scale(1); }
  100% { opacity: 0; transform: scale(1.12); }
}

.firing-foot {
  display: flex;
  justify-content: space-between;
  margin-top: 7px;
  font-family: var(--mono);
  font-size: 5.8px;
  letter-spacing: 0.1em;
  color: var(--dim);
}

.firing-foot b { color: var(--text-soft); font-weight: 500; margin-left: 3px; }

.firing-note {
  margin-top: 5px;
  padding-top: 5px;
  border-top: 1px solid rgba(143, 186, 211, 0.08);
  font-family: var(--mono);
  font-size: 5.2px;
  letter-spacing: 0.12em;
  color: rgba(80, 101, 115, 0.8);
  white-space: nowrap;
}

/* ------------------------------------------------------------------ */
/* Toast                                                              */
/* ------------------------------------------------------------------ */
.toast {
  position: absolute;
  z-index: 60;
  left: 50%;
  bottom: 202px;
  transform: translate(-50%, 10px);
  padding: 8px 14px;
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.13em;
  color: var(--text);
  background: rgba(5, 10, 15, 0.88);
  border: 1px solid rgba(255, 107, 44, 0.3);
  border-left: 2px solid var(--orange);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease, transform 220ms ease;
  white-space: nowrap;
}

.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

/* ------------------------------------------------------------------ */
/* Mobile controls toggle                                             */
/* ------------------------------------------------------------------ */
.panel-toggle {
  display: none;
  position: absolute;
  z-index: 45;
  right: 12px;
  top: 128px;
  align-items: center;
  gap: 6px;
  padding: 9px 11px;
  border: 1px solid rgba(255, 107, 44, 0.35);
  background: rgba(7, 13, 19, 0.88);
  color: var(--orange);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.12em;
}

.panel-toggle svg { width: 14px; height: 14px; }
.panel-toggle.is-open { color: var(--cyan); border-color: rgba(85, 221, 255, 0.36); }

/* ------------------------------------------------------------------ */
/* Loading screen                                                     */
/* ------------------------------------------------------------------ */
.loader {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background:
    radial-gradient(80% 70% at 50% 42%, #0b1822 0%, #050b10 48%, #020406 100%);
  opacity: 1;
  visibility: visible;
  transition: opacity 700ms ease, visibility 700ms ease;
}

.loader.is-done {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-grid {
  position: absolute;
  inset: -20%;
  background-image:
    linear-gradient(rgba(85, 221, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(85, 221, 255, 0.055) 1px, transparent 1px);
  background-size: 62px 62px;
  transform: perspective(600px) rotateX(62deg) scale(1.5);
  transform-origin: center 70%;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 66%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 66%);
  animation: loader-grid-move 6s linear infinite;
}

@keyframes loader-grid-move {
  from { background-position: 0 0, 0 0; }
  to { background-position: 0 62px, 62px 0; }
}

.loader::before,
.loader::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.loader::before {
  width: 520px;
  height: 520px;
  border: 1px solid rgba(255, 107, 44, 0.13);
  box-shadow: 0 0 100px rgba(255, 107, 44, 0.04);
}

.loader::after {
  width: 700px;
  height: 700px;
  border: 1px solid rgba(85, 221, 255, 0.06);
}

.loader-content {
  position: relative;
  z-index: 2;
  width: min(480px, calc(100vw - 48px));
  padding: 0 0 0 26px;
  border-left: 1px solid rgba(255, 107, 44, 0.55);
}

.loader-mark {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
}

.loader-v {
  font-family: var(--mono);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.08em;
  color: var(--orange);
  text-shadow: 0 0 32px rgba(255, 107, 44, 0.55);
}

.loader-stroke {
  width: 54px;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 107, 44, 0.9), transparent);
}

.loader-kicker {
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.26em;
  color: var(--muted);
  margin-bottom: 12px;
}

.loader h1 {
  margin: 0;
  font-size: clamp(34px, 5.4vw, 58px);
  font-weight: 500;
  line-height: 0.92;
  letter-spacing: 0.02em;
  color: rgba(225, 239, 246, 0.86);
}

.loader h1 span {
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 107, 44, 0.9);
  text-shadow: 0 0 42px rgba(255, 107, 44, 0.12);
}

.loader p {
  margin: 17px 0 22px;
  font-family: var(--mono);
  font-size: 8px;
  line-height: 1.8;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.loader-bar {
  position: relative;
  height: 2px;
  width: 100%;
  background: rgba(143, 186, 211, 0.12);
  overflow: hidden;
}

.loader-bar i {
  display: block;
  height: 100%;
  width: 4%;
  background: linear-gradient(90deg, var(--orange), var(--yellow));
  box-shadow: 0 0 14px rgba(255, 107, 44, 0.8);
  transition: width 420ms cubic-bezier(0.25, 0.8, 0.25, 1);
}

.loader-bar::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(90deg, transparent 0 8px, rgba(0, 0, 0, 0.25) 8px 9px);
}

.loader-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 9px;
  font-family: var(--mono);
  font-size: 6px;
  letter-spacing: 0.15em;
  color: var(--dim);
}

/* ------------------------------------------------------------------ */
/* Manual modal                                                       */
/* ------------------------------------------------------------------ */
.modal {
  position: fixed;
  inset: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 26px;
  background: rgba(2, 5, 8, 0.72);
  backdrop-filter: blur(14px) saturate(85%);
  -webkit-backdrop-filter: blur(14px) saturate(85%);
  opacity: 0;
  visibility: hidden;
  transition: opacity 240ms ease, visibility 240ms ease;
}

.modal.is-open { opacity: 1; visibility: visible; }

.modal-card {
  position: relative;
  width: min(840px, 100%);
  max-height: calc(100vh - 60px);
  overflow: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 107, 44, 0.35) transparent;
  padding: 30px 32px 20px;
  background:
    linear-gradient(135deg, rgba(30, 49, 64, 0.44), transparent 33%),
    rgba(6, 12, 17, 0.96);
  border: 1px solid rgba(143, 186, 211, 0.2);
  box-shadow: 0 50px 160px rgba(0, 0, 0, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  clip-path: polygon(18px 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%, 0 18px);
  transform: translateY(16px) scale(0.985);
  transition: transform 260ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.modal.is-open .modal-card { transform: translateY(0) scale(1); }

.modal-card::-webkit-scrollbar { width: 4px; }
.modal-card::-webkit-scrollbar-thumb { background: rgba(255, 107, 44, 0.35); }

.modal-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 18px;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--orange), transparent 60%);
}

.modal-close {
  position: absolute;
  top: 15px;
  right: 17px;
  width: 27px;
  height: 27px;
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 19px;
  font-weight: 300;
  color: var(--muted);
  border: 1px solid var(--line);
  transition: all 160ms ease;
}

.modal-close:hover { color: var(--orange); border-color: rgba(255, 107, 44, 0.4); }

.modal-kicker {
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.25em;
  color: var(--orange);
  margin-bottom: 10px;
}

.modal-card h2 {
  margin: 0;
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 500;
  letter-spacing: 0.05em;
  line-height: 1;
}

.modal-card h2 span {
  color: transparent;
  -webkit-text-stroke: 1px var(--orange);
}

.modal-lede {
  max-width: 660px;
  margin: 14px 0 23px;
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.9;
  letter-spacing: 0.025em;
  color: var(--muted);
}

.help-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.help-item {
  position: relative;
  padding: 15px 16px 14px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.012);
}

.help-num {
  position: absolute;
  top: 14px;
  right: 14px;
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.1em;
  color: rgba(255, 107, 44, 0.5);
}

.help-item h3 {
  margin: 0 0 7px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--text-soft);
}

.help-item p {
  margin: 0;
  font-family: var(--mono);
  font-size: 8.2px;
  line-height: 1.85;
  letter-spacing: 0.015em;
  color: var(--muted);
}

.help-bottom {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 24px;
  padding: 16px 0 12px;
  border-bottom: 1px solid var(--line);
}

.shortcut-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-content: flex-start;
  font-family: var(--mono);
  font-size: 7.2px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.shortcut-list span { display: inline-flex; align-items: center; gap: 5px; }

kbd {
  min-width: 19px;
  padding: 3px 4px;
  display: inline-grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 6px;
  color: var(--text-soft);
  border: 1px solid rgba(143, 186, 211, 0.24);
  background: rgba(255, 255, 255, 0.035);
}

.help-cn {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", var(--font);
  font-size: 9px;
  line-height: 1.9;
  letter-spacing: 0.03em;
  color: rgba(127, 149, 164, 0.78);
}

.modal-foot {
  display: flex;
  justify-content: space-between;
  padding-top: 13px;
  font-family: var(--mono);
  font-size: 6px;
  letter-spacing: 0.14em;
  color: var(--dim);
}

/* ------------------------------------------------------------------ */
/* Responsive                                                         */
/* ------------------------------------------------------------------ */
@media (max-height: 820px) and (min-width: 981px) {
  .dashboard { min-height: 148px; padding-top: 9px; padding-bottom: 8px; }
  .gauge-wrap { min-height: 128px; }
  .rpm-gauge { width: 140px; height: 140px; }
  .rpm-number { font-size: 25px; }
  .control-panel { max-height: calc(100vh - 300px); }
  .scene-caption { bottom: 184px; }
  .toast { bottom: 178px; }
}

@media (max-width: 1350px) {
  .dashboard { grid-template-columns: 158px minmax(300px, 1fr) 300px; gap: 12px; padding-left: 14px; padding-right: 14px; }
  .topbar { grid-template-columns: minmax(220px, 1fr) auto minmax(220px, 1fr); gap: 14px; }
  .mode-btn { padding: 10px 10px; font-size: 8px; }
  .spec-rail { width: 188px; }
  .control-panel { width: 288px; }
  .firing-panel { padding-left: 12px; }
}

@media (max-width: 1180px) {
  .spec-rail { display: none; }
  .topbar { grid-template-columns: minmax(190px, 1fr) auto minmax(170px, 1fr); }
  .brand-sub { display: none; }
  .dashboard { grid-template-columns: 145px minmax(290px, 1fr) 280px; width: calc(100vw - 28px); }
  .control-panel { width: 276px; right: 14px; }
  .metric-value strong { font-size: 19px; }
  .fire-chip { height: 48px; }
  .scene-caption { left: 18px; }
}

@media (max-width: 980px) {
  .topbar {
    height: 76px;
    padding: 0 14px;
    grid-template-columns: 1fr auto;
  }
  .brand-mark { width: 42px; height: 42px; }
  .brand-title { font-size: 14px; }
  .brand-kicker { font-size: 6px; }
  .mode-tabs {
    position: absolute;
    top: 80px;
    left: 50%;
    transform: translateX(-50%);
  }
  .mode-btn { padding: 8px 10px; font-size: 7.5px; }
  .top-actions { gap: 5px; }
  .icon-btn { height: 31px; padding: 0 8px; }
  .icon-btn .btn-label { display: none; }
  .spec-rail { display: none; }
  .control-panel {
    display: none;
    top: 78px;
    right: 10px;
    width: 288px;
    max-height: calc(100vh - 318px);
    z-index: 50;
  }
  .control-panel.is-open { display: block; }
  .control-panel .panel-close { display: grid; }
  .control-panel .panel-head { padding-right: 26px; }
  .panel-toggle { display: inline-flex; top: 79px; right: 10px; }
  .panel-toggle.is-open { right: 306px; }
  .labels-layer { display: none; }
  .scene-caption { display: none; }
  .dashboard {
    bottom: 10px;
    width: calc(100vw - 20px);
    grid-template-columns: 136px minmax(0, 1fr);
    gap: 10px 14px;
    padding: 9px 13px 9px;
    min-height: 0;
  }
  .gauge-wrap { min-height: 126px; border-right: 1px solid var(--line); }
  .rpm-gauge { width: 134px; height: 134px; }
  .rpm-number { font-size: 23px; }
  .dash-main { min-width: 0; }
  .firing-panel {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 12px;
    align-items: center;
    padding: 7px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }
  .firing-head { grid-column: 1; display: flex; flex-direction: column; align-items: flex-start; gap: 2px; padding: 0; min-width: 78px; }
  .firing-head .firing-sequence { font-size: 5.6px; }
  .firing-order { grid-column: 2; }
  .firing-foot { grid-column: 3; display: flex; flex-direction: column; gap: 3px; align-items: flex-end; margin: 0; min-width: 60px; }
  .firing-note { display: none; }
  .fire-chip { height: 42px; }
  .toast { bottom: 234px; }
}

@media (max-width: 720px) {
  .app { min-height: 520px; }
  .topbar { height: 66px; padding: 0 11px; gap: 8px; }
  .brand { gap: 9px; }
  .brand-mark { width: 36px; height: 36px; }
  .brand-v { font-size: 16px; }
  .brand-title { font-size: 12px; }
  .brand-kicker { display: none; }
  .mode-tabs { top: 68px; padding: 3px; width: calc(100vw - 20px); justify-content: space-between; }
  .mode-btn { flex: 1; justify-content: center; padding: 7px 3px; font-size: 6.5px; letter-spacing: 0.08em; gap: 4px; }
  .mode-dot { display: none; }
  .icon-btn { height: 29px; min-width: 29px; padding: 0 7px; }
  .panel-toggle { top: 116px; right: 10px; }
  .panel-toggle.is-open { right: 10px; top: 116px; opacity: 0; pointer-events: none; }
  .control-panel {
    top: 111px;
    right: 10px;
    width: min(300px, calc(100vw - 20px));
    max-height: calc(100vh - 330px);
  }
  .dashboard {
    width: calc(100vw - 12px);
    bottom: 6px;
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 8px 10px;
    padding: 8px 10px;
  }
  .gauge-wrap { min-height: 106px; }
  .rpm-gauge { width: 116px; height: 116px; }
  .rpm-number { font-size: 20px; }
  .rpm-caption { font-size: 5px; }
  .gear-badge { display: none; }
  .metrics-row { grid-template-columns: 1fr 1fr; }
  .metric:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
  .metric:nth-child(4) { border-top: 1px solid var(--line); }
  .metric { padding: 5px 8px 5px 0; }
  .metric + .metric { padding-left: 8px; }
  .metric-value strong { font-size: 16px; }
  .cycle-block { margin-top: 5px; }
  .cycle-head { gap: 7px; margin-bottom: 4px; }
  .cycle-title { font-size: 5.5px; }
  .stroke-name { font-size: 5.8px; padding: 1px 4px; }
  .cycle-labels span { font-size: 4.8px; }
  .valve-row { grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 5px; }
  .state-stack { display: none; }
  .firing-panel { grid-template-columns: 1fr; gap: 6px; }
  .firing-head { flex-direction: row; align-items: center; justify-content: space-between; min-width: 0; width: 100%; }
  .firing-order { width: 100%; }
  .firing-foot { display: none; }
  .fire-chip { height: 38px; }
  .fire-chip b { font-size: 13px; }
  .fire-chip .fire-index { display: none; }
  .toast { bottom: 218px; font-size: 6px; padding: 7px 10px; }
  .loader-content { padding-left: 18px; }
  .loader h1 { font-size: 35px; }
  .modal { padding: 10px; }
  .modal-card { padding: 22px 17px 14px; max-height: calc(100vh - 20px); }
  .help-grid { grid-template-columns: 1fr; }
  .help-bottom { grid-template-columns: 1fr; gap: 13px; }
  .modal-foot { flex-direction: column; gap: 5px; }
}

@media (max-width: 460px) {
  .brand-title { font-size: 10px; letter-spacing: 0.08em; }
  .brand-copy { gap: 1px; }
  .mode-btn { font-size: 5.8px; padding: 6px 1px; }
  .top-actions .icon-btn:nth-child(2) { display: none; }
  .dashboard { grid-template-columns: 100px minmax(0, 1fr); }
  .rpm-gauge { width: 104px; height: 104px; }
  .rpm-number { font-size: 18px; }
  .gauge-wrap { min-height: 98px; }
  .cycle-title { display: none; }
  .cycle-head { justify-content: space-between; }
  .metrics-row { grid-template-columns: 1fr 1fr; }
  .valve-row { display: none; }
  .fire-chip { height: 34px; }
  .firing-order { gap: 1px; }
  .toast { max-width: calc(100vw - 24px); white-space: normal; text-align: center; }
}

@media (max-height: 680px) and (min-width: 981px) {
  .spec-rail { display: none; }
  .control-panel { top: 92px; max-height: calc(100vh - 270px); }
  .dashboard { min-height: 132px; bottom: 10px; }
  .gauge-wrap { min-height: 118px; }
  .rpm-gauge { width: 128px; height: 128px; }
  .rpm-number { font-size: 22px; }
  .scene-caption { display: none; }
  .toast { bottom: 158px; }
}

@media (prefers-reduced-motion: reduce) {
  .grain,
  .start-button::before,
  .loader-grid,
  .hotspot-dot::after,
  .fire-chip.is-firing::after { animation: none !important; }
  * { scroll-behavior: auto !important; }
}