/* Cosmic Clocks — a listening room for pulsars.
 * One committed dark world: the page is a night-time observatory, so it keeps
 * its own palette whatever the host theme is. */
:root {
  color-scheme: dark;
  --void: #04050b;
  --void-2: #080b16;
  --ink: #e9edf6;
  --ink-2: #aab3c7;
  --ink-3: #6b7489;
  --line: rgba(160, 185, 240, 0.13);
  --line-2: rgba(160, 185, 240, 0.22);
  --glass: rgba(7, 10, 20, 0.62);
  --glass-2: rgba(10, 14, 28, 0.82);
  --ice: #9fe7ff;
  --ice-dim: rgba(159, 231, 255, 0.16);
  --amber: #ffb547;
  --amber-dim: rgba(255, 181, 71, 0.16);
  --ember: #ff6a3a;
  --rose: #ff7a96;
  --f-display: "Cormorant", "Cormorant Garamond", "EB Garamond", Georgia, "Times New Roman", serif;
  --f-mono: "Martian Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --f-body: "Archivo", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --gutter: 28px;
  --console-h: 104px;
  --top-h: 60px;
  --radius: 12px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--void);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--ice); text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; border-radius: 6px; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ------------------------------------------------------------ the sky */
#sky {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 0;
  touch-action: none;
  cursor: grab;
}
#sky.dragging { cursor: grabbing; }
body.no-webgl #sky { display: none; }
body.no-webgl {
  background:
    radial-gradient(circle at 58% 44%, rgba(159, 231, 255, 0.35) 0, rgba(159, 231, 255, 0.05) 9%, transparent 22%),
    radial-gradient(ellipse at 50% 60%, rgba(90, 60, 160, 0.25), transparent 60%),
    var(--void);
}

/* labels floating in the scene */
.labels { position: fixed; inset: 0; z-index: 2; pointer-events: none; overflow: hidden; }
.lbl {
  position: absolute;
  left: 0; top: 0;
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
  white-space: nowrap;
  will-change: transform;
}
.lbl small { display: block; color: var(--ink-3); font-size: 9px; letter-spacing: 0.06em; text-transform: none; }
.lbl.note { color: rgba(255, 196, 120, 0.85); }
.lbl.tag { color: var(--ink-2); transform-origin: 50% 100%; }
.lbl.marker {
  pointer-events: auto;
  cursor: pointer;
  padding: 3px 6px;
  border-radius: 4px;
  color: rgba(255, 205, 150, 0.9);
  background: rgba(4, 5, 11, 0.35);
  border: 1px solid transparent;
}
.lbl.marker:hover, .lbl.marker:focus-visible { border-color: rgba(255, 181, 71, 0.5); color: #fff3dc; }
.lbl.marker.cur { color: var(--ice); border-color: rgba(159, 231, 255, 0.4); }
.lbl.sun { color: #ffe3a0; }
.lbl.const { font-size: 9px; letter-spacing: 0.22em; color: rgba(160, 185, 240, 0.7); text-shadow: 0 0 8px rgba(4, 5, 11, 0.9); }
.lbl.skycur { font-size: 12px; letter-spacing: 0.06em; color: var(--ice); text-transform: none; text-shadow: 0 0 10px rgba(4, 5, 11, 0.9); }
.lbl.skycur small { color: rgba(255, 196, 120, 0.85); font-size: 9.5px; margin-top: 2px; }

/* ------------------------------------------------------------ top bar */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 20;
  height: calc(var(--top-h) + env(safe-area-inset-top, 0px));
  padding: env(safe-area-inset-top, 0px) var(--gutter) 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  pointer-events: none;
}
.topbar > * { pointer-events: auto; }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}
.brand-mark { width: 26px; height: 26px; color: var(--ice); filter: drop-shadow(0 0 6px rgba(159, 231, 255, 0.55)); }
.brand-name {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 500;
  font-stretch: 112%;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}
.top-actions { display: flex; gap: 8px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: rgba(7, 10, 20, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-2);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.chip svg { width: 16px; height: 16px; }
.chip { white-space: nowrap; }
.chip:hover { color: var(--ink); border-color: rgba(255, 181, 71, 0.55); }
.chip[aria-pressed="true"] { color: var(--amber); border-color: rgba(255, 181, 71, 0.6); background: rgba(40, 25, 8, 0.55); }
.chip.logbook-toggle { display: none; }

/* --------------------------------------------------------- app layout */
.app {
  position: fixed;
  z-index: 5;
  top: calc(var(--top-h) + env(safe-area-inset-top, 0px));
  bottom: calc(var(--console-h) + env(safe-area-inset-bottom, 0px));
  left: 0; right: 0;
  padding: 8px var(--gutter) 14px;
  display: grid;
  grid-template-columns: minmax(340px, 440px) minmax(0, 1fr) minmax(300px, 360px);
  grid-template-rows: minmax(0, 1fr) auto auto;
  grid-template-areas:
    "id    .  log"
    "inst  .  log"
    "set   .  log";
  column-gap: 24px;
  row-gap: 12px;
  pointer-events: none;
}
.app::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(4, 5, 11, 0.86) 0, rgba(4, 5, 11, 0.55) 22%, rgba(4, 5, 11, 0.18) 34%, transparent 46%),
    linear-gradient(0deg, rgba(4, 5, 11, 0.9) 0, transparent 22%);
}
.app > * { pointer-events: auto; min-width: 0; }

/* identity + the clock readout */
.identity { grid-area: id; align-self: start; padding-top: 1.5vh; text-shadow: 0 1px 14px rgba(4, 5, 11, 0.9), 0 0 2px rgba(4, 5, 11, 0.6); }
.eyebrow {
  margin: 0 0 10px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  column-gap: 10px;
  row-gap: 2px;
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.eyebrow .dot { width: 4px; height: 4px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 8px var(--amber); }
.designation {
  margin: 0;
  font-family: var(--f-mono);
  font-weight: 500;
  font-size: clamp(24px, 2.4vw, 36px);
  font-stretch: 100%;
  letter-spacing: 0.01em;
  line-height: 1.12;
  text-wrap: balance;
}
.aka {
  margin: 4px 0 0;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  min-height: 1em;
}
.nickname {
  margin: 8px 0 0;
  font-family: var(--f-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(24px, 2.3vw, 32px);
  line-height: 1.15;
  color: var(--ink-2);
  text-wrap: balance;
}
.readout { margin-top: clamp(14px, 3vh, 30px); }
.rate { margin: 0; display: flex; align-items: flex-end; gap: 14px; }
.rate-num {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: clamp(60px, 6.6vw, 108px);
  line-height: 0.82;
  font-variant-numeric: lining-nums tabular-nums;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-shadow: 0 0 34px rgba(159, 231, 255, 0.25);
}
.rate-unit {
  padding-bottom: 6px;
  font-family: var(--f-mono);
  font-size: 10.5px;
  line-height: 1.5;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.period {
  margin: 12px 0 0;
  font-family: var(--f-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}
.hear { margin: 14px 0 0; font-size: 15px; color: var(--ink); }
.hear-tag, .listen-tag {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 7px;
  border-radius: 4px;
  font-family: var(--f-mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  background: var(--amber-dim);
  vertical-align: 2px;
}
.since {
  margin: 10px 0 0;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}
.since b { color: var(--ice); font-weight: 500; }
.rec { margin: 12px 0 0; }
.rec a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255, 181, 71, 0.4);
  background: rgba(40, 25, 8, 0.45);
  color: var(--amber);
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-shadow: none;
  transition: background 0.2s, border-color 0.2s;
}
.rec a:hover { background: rgba(60, 38, 10, 0.7); border-color: var(--amber); }
.rec svg { width: 15px; height: 15px; }

.swap { animation: swap-in 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) both; }
@keyframes swap-in {
  from { opacity: 0; transform: translateY(10px); filter: blur(4px); }
  to { opacity: 1; transform: none; filter: none; }
}

/* ------------------------------------------------------------ panels */
.panel-title {
  margin: 0;
  font-family: var(--f-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.panel {
  margin: 0;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(12px) saturate(120%);
  -webkit-backdrop-filter: blur(12px) saturate(120%);
}
.instruments { grid-area: inst; display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr); gap: 10px; }
.instrument { display: flex; flex-direction: column; min-width: 0; overflow: hidden; }
.instrument figcaption {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 9px 12px 0;
}
.instrument .meta {
  font-family: var(--f-mono);
  font-size: 9.5px;
  letter-spacing: 0.04em;
  color: var(--ink-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-variant-numeric: tabular-nums;
}
.instrument canvas { display: block; width: 100%; height: clamp(120px, 19vh, 176px); }

/* logbook */
.logbook {
  grid-area: log;
  align-self: stretch;
  overflow-y: auto;
  padding: 18px 20px 20px;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  scrollbar-width: thin;
  scrollbar-color: rgba(160, 185, 240, 0.25) transparent;
}
.logbook .panel-title.sub { margin-top: 22px; }
.story { margin: 12px 0 0; font-size: 14.5px; line-height: 1.62; color: var(--ink); max-width: 62ch; }
.listen { margin: 14px 0 0; font-size: 14px; line-height: 1.55; color: var(--ink-2); }
.facts {
  margin: 18px 0 0;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 0;
  border-top: 1px solid var(--line);
}
.facts dt, .facts dd { margin: 0; padding: 8px 0; border-bottom: 1px solid var(--line); }
.facts dt {
  font-family: var(--f-mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: 10px;
}
.facts dd { font-size: 13.5px; color: var(--ink); text-align: right; font-variant-numeric: tabular-nums; }
.calcs { list-style: none; margin: 10px 0 0; padding: 0; display: grid; gap: 10px; }
.calcs li {
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(159, 231, 255, 0.04);
  border: 1px solid rgba(159, 231, 255, 0.08);
}
.calcs .what { display: block; font-size: 12.5px; color: var(--ink-2); }
.calcs code {
  display: block;
  margin-top: 4px;
  font-family: var(--f-mono);
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--ink);
  overflow-wrap: anywhere;
}
.calcs code b { color: var(--ice); font-weight: 500; }

/* settings row */
.settings {
  grid-area: set;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) auto minmax(0, 0.8fr);
  gap: 14px;
  align-items: start;
}
.field { display: flex; flex-direction: column; gap: 7px; min-width: 0; }
.field output {
  font-family: var(--f-mono);
  font-size: 10.5px;
  color: var(--amber);
  letter-spacing: 0.04em;
  white-space: nowrap;
}
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 18px;
  background: transparent;
  margin: 0;
}
input[type="range"]::-webkit-slider-runnable-track { height: 2px; background: linear-gradient(90deg, rgba(255, 181, 71, 0.2), rgba(255, 181, 71, 0.55)); border-radius: 2px; }
input[type="range"]::-moz-range-track { height: 2px; background: linear-gradient(90deg, rgba(255, 181, 71, 0.2), rgba(255, 181, 71, 0.55)); border-radius: 2px; }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  margin-top: -6px;
  border-radius: 50%;
  background: #1a1208;
  border: 2px solid var(--amber);
  box-shadow: 0 0 10px rgba(255, 181, 71, 0.5);
}
input[type="range"]::-moz-range-thumb {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: #1a1208;
  border: 2px solid var(--amber);
  box-shadow: 0 0 10px rgba(255, 181, 71, 0.5);
}
.seg { display: inline-flex; border: 1px solid var(--line-2); border-radius: 999px; padding: 2px; background: rgba(7, 10, 20, 0.5); }
.seg button {
  border: 0;
  background: transparent;
  padding: 5px 11px;
  border-radius: 999px;
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
}
.seg button[aria-pressed="true"] { background: var(--amber-dim); color: var(--amber); }

/* ------------------------------------------------------------ console */
.console {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 20;
  height: calc(var(--console-h) + env(safe-area-inset-bottom, 0px));
  padding: 12px var(--gutter) calc(14px + env(safe-area-inset-bottom, 0px));
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  background: linear-gradient(0deg, rgba(4, 5, 11, 0.96) 0, rgba(4, 5, 11, 0.82) 70%, rgba(4, 5, 11, 0));
}
.transport { display: flex; align-items: center; gap: 10px; }
.round {
  width: 38px; height: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  background: rgba(7, 10, 20, 0.6);
  color: var(--ink-2);
  transition: color 0.2s, border-color 0.2s;
}
.round svg { width: 18px; height: 18px; }
.round:hover { color: var(--ink); border-color: rgba(255, 181, 71, 0.55); }
.play {
  width: 58px; height: 58px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1.5px solid var(--amber);
  background: radial-gradient(circle at 50% 40%, #3a2208, #140c04 70%);
  color: var(--amber);
  box-shadow: 0 0 0 5px rgba(255, 181, 71, 0.07), 0 0 26px rgba(255, 150, 50, 0.35);
  transition: transform 0.15s, box-shadow 0.3s;
}
.play svg { width: 22px; height: 22px; }
.play:hover { transform: scale(1.04); }
.play .i-pause { display: none; }
.play.on .i-pause { display: block; }
.play.on .i-play { display: none; }
.play.on { box-shadow: 0 0 0 5px rgba(255, 181, 71, 0.1), 0 0 34px rgba(255, 150, 50, 0.55); }
.dial-wrap { position: relative; min-width: 0; height: 76px; }
#cv-dial {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 10px;
  border: 1px solid rgba(255, 181, 71, 0.22);
  box-shadow: inset 0 0 24px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(0, 0, 0, 0.6);
  cursor: ew-resize;
  touch-action: none;
}
.dial-status {
  position: absolute;
  right: 10px; top: 6px;
  margin: 0;
  font-family: var(--f-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
  pointer-events: none;
}
.meter {
  width: 8px; height: 58px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}
.meter span { display: block; width: 100%; height: 0; background: linear-gradient(0deg, var(--amber), #fff0c8); transition: height 0.06s linear; }

/* ---------------------------------------------------- cosmic events */
.events {
  position: fixed;
  z-index: 15;
  left: 50%;
  bottom: calc(var(--console-h) + 22px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
}
.ev-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 38px;
  padding: 0 16px 0 12px;
  border-radius: 999px;
  border: 1px solid rgba(159, 231, 255, 0.35);
  background: rgba(7, 14, 26, 0.62);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--ice);
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
  box-shadow: 0 0 22px rgba(159, 231, 255, 0.12);
  transition: box-shadow 0.25s, border-color 0.25s, transform 0.15s;
}
.ev-btn svg { width: 16px; height: 16px; }
.ev-btn:hover { border-color: var(--ice); box-shadow: 0 0 30px rgba(159, 231, 255, 0.3); transform: translateY(-1px); }
.evcap {
  position: fixed;
  z-index: 15;
  left: 50%;
  top: calc(var(--top-h) + 7vh);
  transform: translateX(-50%);
  text-align: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.9s ease;
  width: min(560px, 90vw);
}
.evcap.show { opacity: 1; }
.evcap-main {
  margin: 0;
  font-family: var(--f-display);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(34px, 4vw, 58px);
  line-height: 1;
  text-shadow: 0 0 6px rgba(4, 5, 11, 0.8), 0 0 30px rgba(4, 5, 11, 0.9);
}
.evcap-sub {
  margin: 10px 0 0;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  text-shadow: 0 0 3px #04050b, 0 0 10px #04050b, 0 0 22px rgba(4, 5, 11, 0.9);
}

/* ------------------------------------------------------ cinema tour */
.cine, .cine-exit { display: none; }
body.cinema .cine {
  display: block;
  position: fixed;
  z-index: 25;
  left: clamp(20px, 5vw, 72px);
  bottom: clamp(28px, 8vh, 90px);
  max-width: min(720px, 90vw);
  pointer-events: none;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 1.1s ease, transform 1.1s ease;
  text-shadow: 0 0 24px rgba(4, 5, 11, 0.85);
}
body.cinema .cine.show { opacity: 1; transform: none; }
.cine-eyebrow { margin: 0; font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.24em; text-transform: uppercase; color: var(--amber); }
.cine-name { margin: 10px 0 0; font-family: var(--f-mono); font-weight: 500; font-size: clamp(30px, 4.4vw, 60px); line-height: 1.05; letter-spacing: 0.01em; }
.cine-title { margin: 6px 0 0; font-family: var(--f-display); font-style: italic; font-weight: 300; font-size: clamp(24px, 3vw, 40px); color: var(--ink-2); }
.cine-rate { margin: 14px 0 0; font-family: var(--f-mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-2); }
.cine-rate span:first-child { font-family: var(--f-display); font-size: 30px; letter-spacing: 0; color: var(--ice); text-transform: none; }
body.cinema .cine-exit {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  position: fixed;
  z-index: 26;
  top: calc(14px + env(safe-area-inset-top, 0px));
  right: 16px;
  height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--line-2);
  background: rgba(7, 10, 20, 0.4);
  color: var(--ink-3);
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.55;
}
body.cinema .cine-exit:hover { opacity: 1; color: var(--ink); }
body.cinema .app, body.cinema .console, body.cinema .topbar, body.cinema .labels, body.cinema .events, body.cinema .toast { opacity: 0 !important; pointer-events: none !important; }
body.cinema #sky { cursor: none; }

/* ------------------------------------------------------------- intro */
.intro {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  padding: 90px var(--gutter) 120px;
  background:
    linear-gradient(90deg, rgba(4, 5, 11, 0.92) 0, rgba(4, 5, 11, 0.72) 42%, rgba(4, 5, 11, 0.12) 75%),
    linear-gradient(0deg, rgba(4, 5, 11, 0.6), transparent 40%);
  transition: opacity 0.9s ease, visibility 0.9s;
}
.intro.gone { opacity: 0; visibility: hidden; pointer-events: none; }
.app, .console, .labels { transition: opacity 0.9s ease 0.2s; }
body.intro-on .app, body.intro-on .console, body.intro-on .labels .lbl:not(.marker):not(.sun) { opacity: 0; pointer-events: none; }
body.intro-on .top-actions .logbook-toggle, body.intro-on #btn-map { visibility: hidden; }
.intro-inner { max-width: 600px; }
.intro-kicker {
  margin: 0 0 18px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}
.intro-title {
  margin: 0;
  font-family: var(--f-display);
  font-weight: 300;
  font-size: clamp(42px, 6vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.intro-text { margin: 24px 0 0; max-width: 54ch; font-size: 16.5px; line-height: 1.62; color: var(--ink-2); }
.intro-text b { color: var(--ink); font-weight: 600; }
.intro-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.btn-primary, .btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 50px;
  padding: 0 24px;
  border-radius: 999px;
  font-family: var(--f-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
}
.btn-primary {
  border: 1.5px solid var(--amber);
  color: #1b1004;
  background: linear-gradient(180deg, #ffc56a, #ff9f2e);
  box-shadow: 0 0 34px rgba(255, 159, 46, 0.4);
  font-weight: 600;
}
.btn-primary svg, .btn-ghost svg { width: 16px; height: 16px; flex: none; }
.btn-primary:hover { box-shadow: 0 0 44px rgba(255, 159, 46, 0.6); }
.btn-ghost { border: 1px solid var(--line-2); background: rgba(7, 10, 20, 0.5); color: var(--ink-2); }
.btn-ghost:hover { color: var(--ink); border-color: rgba(255, 181, 71, 0.5); }
.intro-jump { margin: 20px 0 0; font-size: 14px; color: var(--ink-3); }
.intro-fine { margin: 26px 0 0; max-width: 56ch; font-size: 12.5px; color: var(--ink-3); }

/* ------------------------------------------------------------- modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 24px 16px;
  background: rgba(2, 3, 8, 0.7);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.modal-card {
  width: min(760px, 100%);
  max-height: min(86vh, 900px);
  display: flex;
  flex-direction: column;
  background: var(--glass-2);
  border: 1px solid var(--line-2);
  border-radius: 16px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
}
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px 12px;
  border-bottom: 1px solid var(--line);
}
.modal-head h2 { margin: 0; font-family: var(--f-display); font-weight: 400; font-style: italic; font-size: 30px; }
.modal-body { overflow-y: auto; padding: 6px 22px 22px; }
.modal-body section { padding: 14px 0; border-bottom: 1px solid var(--line); }
.modal-body section:last-child { border-bottom: 0; }
.modal-body h3 {
  margin: 0 0 6px;
  font-family: var(--f-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}
.modal-body p { margin: 0; max-width: 68ch; color: var(--ink-2); font-size: 14.5px; }
.modal-body em { color: var(--ink); font-style: normal; }
.formulae, .keys { margin: 4px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; color: var(--ink-2); font-size: 14px; }
.formulae code {
  display: inline-block;
  min-width: 13.5em;
  margin-right: 10px;
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--ice);
}
kbd {
  display: inline-block;
  min-width: 1.8em;
  padding: 1px 6px;
  border: 1px solid var(--line-2);
  border-bottom-width: 2px;
  border-radius: 5px;
  font-family: var(--f-mono);
  font-size: 11px;
  text-align: center;
  color: var(--ink);
}
.toggle { display: flex; align-items: center; gap: 10px; margin-top: 14px; font-size: 14px; color: var(--ink); cursor: pointer; }
.toggle input { width: 18px; height: 18px; accent-color: var(--amber); }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--console-h) + 20px);
  transform: translateX(-50%);
  z-index: 60;
  margin: 0;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--glass-2);
  border: 1px solid var(--line-2);
  font-size: 13.5px;
  color: var(--ink);
}

/* ------------------------------------------------ medium: logbook drawer */
@media (max-width: 1100px) {
  #btn-sky-label, #btn-tour-label, #btn-map-label { display: none; }
  .chip { padding: 0 11px; }
}
@media (max-width: 1180px) {
  .app {
    grid-template-columns: minmax(310px, 400px) minmax(0, 1fr);
    grid-template-areas:
      "id   ."
      "inst ."
      "set  .";
  }
  .chip.logbook-toggle { display: inline-flex; }
  .logbook {
    position: fixed;
    z-index: 30;
    top: calc(var(--top-h) + env(safe-area-inset-top, 0px));
    right: var(--gutter);
    bottom: calc(var(--console-h) + 10px + env(safe-area-inset-bottom, 0px));
    width: min(380px, calc(100vw - 2 * var(--gutter)));
    background: var(--glass-2);
    transform: translateX(calc(100% + 40px));
    transition: transform 0.45s cubic-bezier(0.2, 0.7, 0.2, 1);
  }
  body.log-open .logbook { transform: none; }
}
@media (max-height: 760px) and (min-width: 761px) {
  .instrument canvas { height: 112px; }
  .readout { margin-top: 10px; }
  .rate-num { font-size: clamp(54px, 5.4vw, 84px); }
}

/* ------------------------------------------------------ phones: scroll */
@media (max-width: 760px) {
  :root { --gutter: 16px; --console-h: 128px; --top-h: 54px; }
  body { overflow-x: hidden; overflow-y: auto; }
  .topbar { background: linear-gradient(180deg, rgba(4, 5, 11, 0.85), rgba(4, 5, 11, 0)); }
  .brand-name { font-size: 10.5px; letter-spacing: 0.22em; }
  .chip { height: 32px; padding: 0 11px; font-size: 9.5px; }
  #btn-map-label { display: none; }
  .app {
    position: relative;
    top: auto; bottom: auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
    min-height: 100%;
    padding: 50vh var(--gutter) calc(var(--console-h) + 48px + env(safe-area-inset-bottom, 0px));
    pointer-events: auto;
  }
  .app::before {
    position: absolute;
    background: linear-gradient(180deg, transparent 0, transparent 34vh, rgba(4, 5, 11, 0.86) 58vh, var(--void) 80vh);
  }
  .identity { padding-top: 0; }
  .rate-num { font-size: 64px; }
  .instruments { grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr); }
  .instrument canvas { height: 132px; }
  .settings { grid-template-columns: 1fr 1fr; }
  .settings .field:nth-child(2) { grid-column: 1 / -1; order: -1; }
  .chip.logbook-toggle { display: none; }
  .logbook {
    position: static;
    width: auto;
    transform: none;
    overflow: visible;
    background: var(--glass);
  }
  .instruments { order: 1; }
  .settings { order: 2; }
  .logbook { order: 3; }
  body.intro-on .labels { opacity: 0; }
  .console {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    gap: 8px;
    padding-top: 10px;
    background: var(--void);
  }
  .console::before {
    content: '';
    position: absolute;
    left: 0; right: 0; bottom: 100%;
    height: 40px;
    background: linear-gradient(0deg, var(--void), rgba(4, 5, 11, 0));
    pointer-events: none;
  }
  .transport { justify-content: center; gap: 22px; }
  .play { width: 48px; height: 48px; }
  .dial-wrap { height: 62px; }
  .meter { display: none; }
  .events { position: absolute; top: calc(50vh - 58px); bottom: auto; }
  .ev-btn { height: 34px; font-size: 9.5px; }
  .evcap { top: calc(var(--top-h) + 3vh); }
  .ev-btn { padding: 0 12px 0 10px; gap: 6px; }
  .intro { align-items: flex-end; padding: 80px var(--gutter) 40px; background: linear-gradient(0deg, rgba(4, 5, 11, 0.96) 0, rgba(4, 5, 11, 0.8) 55%, rgba(4, 5, 11, 0.2)); }
  .intro-title { font-size: 44px; }
  .intro-text { font-size: 15px; }
}

@media (max-width: 440px) {
  .brand-name { display: none; }
  .top-actions { gap: 6px; }
  .ev-btn svg { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .swap { animation: none; }
  .intro, .logbook { transition: none; }
}