:root {
  --ground: #0d3a72;
  --ground-deep: #0a2d5a;
  --line: #eef4ff;
  --line-dim: rgba(238, 244, 255, 0.62);
  --line-faint: rgba(238, 244, 255, 0.16);
  --ink-muted: #b9cbe6;
  --pencil: #ffd23f;
  --on-pencil: #0a2d5a;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --gutter: clamp(20px, 4vw, 72px);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scrollbar-color: var(--line-dim) var(--ground-deep); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background-color: var(--ground);
  background-image:
    linear-gradient(var(--line-faint) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-faint) 1px, transparent 1px),
    linear-gradient(rgba(238, 244, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(238, 244, 255, 0.06) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  color: var(--line);
  font: 400 1.0625rem/1.55 "Barlow", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--pencil); color: var(--on-pencil); }
:focus-visible { outline: 2px solid var(--pencil); outline-offset: 3px; }

/* ---------- sheet frame ---------- */
.frame {
  position: fixed; inset: 10px; z-index: 5; pointer-events: none;
  border: 1px solid var(--line-dim);
}
.frame::before {
  content: ""; position: absolute; inset: 4px; border: 1px solid var(--line-faint);
}
.zones {
  position: absolute; display: flex; justify-content: space-around;
  font: 400 10px/1 "B612 Mono", monospace; color: var(--ink-muted); opacity: 0.8;
}
.zones-y { top: 0; bottom: 0; left: 8px; flex-direction: column; align-items: center; }
.zones-x { left: 0; right: 0; bottom: 8px; }

.hud { position: fixed; z-index: 6; top: 24px; right: 28px; display: flex; align-items: stretch; gap: 10px; }
.jump { display: flex; background: var(--ground-deep); border: 1px solid var(--line-dim); }
.jump a {
  display: flex; align-items: center; padding: 0 14px;
  font: 600 0.95rem/1 "Barlow Condensed", sans-serif; letter-spacing: 0.12em; text-transform: uppercase;
  text-decoration: none; color: var(--line);
}
.jump a + a { border-left: 1px solid var(--line-dim); }
.jump a:hover, .jump a[aria-current="true"] { color: var(--pencil); }
.readout {
  margin: 0;
  display: flex; gap: 14px; padding: 5px 10px;
  background: var(--ground-deep); border: 1px solid var(--line-dim);
  font: 400 11px/1 "B612 Mono", monospace; letter-spacing: 0.04em; color: var(--ink-muted);
}
.readout b { color: var(--line); font-weight: 700; }
.ro-part { display: none; color: var(--pencil); text-transform: uppercase; }

/* ---------- layout ---------- */
.sheet {
  display: grid;
  grid-template-columns: minmax(300px, 44%) minmax(0, 1fr);
  max-width: 1560px; margin-inline: auto;
}
.stage { position: sticky; top: 0; height: 100vh; height: 100svh; padding: 18px 0 18px 20px; }
#drawing { width: 100%; height: 100%; display: block; overflow: visible; }

.content { padding: 0 calc(var(--gutter) + 12px) 0 var(--gutter); min-width: 0; }
.panel { padding-block: clamp(64px, 10vh, 120px); }
.hero { min-height: 100vh; min-height: 100svh; display: flex; flex-direction: column; justify-content: center; padding-block: 90px 60px; }
.release { min-height: 100svh; padding-bottom: 120px; }

/* ---------- type ---------- */
h1, h2, h3, h4 {
  font-family: "Barlow Condensed", "Arial Narrow", sans-serif;
  text-transform: uppercase; text-wrap: balance; margin: 0;
}
h1 { font-weight: 700; font-size: clamp(3.4rem, 8vw, 6rem); line-height: 0.92; letter-spacing: 0.01em; }
h2 { font-weight: 600; font-size: clamp(2.1rem, 4.2vw, 3.1rem); line-height: 1; letter-spacing: 0.03em; }
h3 { font-weight: 600; font-size: clamp(1.7rem, 3vw, 2.2rem); line-height: 1.05; letter-spacing: 0.04em; transition: color 0.3s var(--ease); }
h4 { font-weight: 600; font-size: 1.15rem; letter-spacing: 0.08em; }
p { margin: 0 0 1rem; max-width: 62ch; text-wrap: pretty; }
.lead { font-size: clamp(1.2rem, 1.9vw, 1.45rem); line-height: 1.4; margin-top: 1.4rem; max-width: 44ch; }
.support { color: var(--ink-muted); max-width: 52ch; }
.designation {
  font: 500 1rem/1.3 "Barlow Condensed", sans-serif; letter-spacing: 0.08em;
  color: var(--ink-muted); text-transform: uppercase; margin: 0.5rem 0 1.1rem;
}
.panel-head { margin-bottom: clamp(32px, 6vh, 64px); }
.panel-head p { margin-top: 1rem; color: var(--ink-muted); }

a { color: var(--line); text-decoration-thickness: 1px; text-underline-offset: 4px; }
a:hover { color: var(--pencil); }

/* ---------- buttons ---------- */
.actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 1.6rem; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  min-height: 48px; padding: 0 22px;
  font: 600 1.05rem/1 "Barlow Condensed", sans-serif; letter-spacing: 0.12em; text-transform: uppercase;
  text-decoration: none; border: 1px solid var(--line); color: var(--line);
  transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}
.btn-primary { background: var(--pencil); border-color: var(--pencil); color: var(--on-pencil); }
.btn-primary:hover { background: var(--line); border-color: var(--line); color: var(--on-pencil); }
.btn-ghost:hover { background: var(--line); color: var(--on-pencil); }

/* ---------- title block ---------- */
.titleblock {
  display: grid; grid-template-columns: 2fr 1fr 1fr; margin: 3rem 0 0; max-width: 560px;
  border: 1px solid var(--line-dim);
}
.titleblock div { padding: 8px 12px; border-right: 1px solid var(--line-dim); min-width: 0; }
.titleblock div:last-child { border-right: 0; }
.titleblock dt { font: 500 0.8rem/1 "Barlow Condensed", sans-serif; color: var(--ink-muted); text-transform: uppercase; letter-spacing: 0.08em; }
.titleblock dd { margin: 6px 0 0; font: 600 0.95rem/1.15 "Barlow Condensed", sans-serif; letter-spacing: 0.06em; text-transform: uppercase; }

/* ---------- detail sheets ---------- */
.detail, .leg {
  position: relative; padding-block: clamp(36px, 6vh, 64px);
  border-top: 1px solid var(--line-dim); scroll-margin-top: 24px;
}
.detail { min-height: 56vh; }
.leg { min-height: 100vh; min-height: 100svh; }
.detail::before, .leg::before {
  content: ""; position: absolute; top: -4px; left: 0; width: 7px; height: 7px;
  background: var(--ground); border: 1px solid var(--line-dim); transition: background-color 0.3s, border-color 0.3s;
}
.detail.on h3, .leg.on h3 { color: var(--pencil); }
.detail.on::before, .leg.on::before { background: var(--pencil); border-color: var(--pencil); }

.spec { display: grid; grid-template-columns: minmax(7.5rem, 10rem) 1fr; margin: 1.4rem 0; border-top: 1px solid var(--line-faint); }
.spec dt, .spec dd { padding: 10px 0; border-bottom: 1px solid var(--line-faint); margin: 0; }
.spec dt { font: 600 0.95rem/1.4 "Barlow Condensed", sans-serif; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-muted); padding-right: 12px; }
.spec dd { line-height: 1.45; }
.n { font: 600 1.18em/1 "Barlow Condensed", sans-serif; letter-spacing: 0.04em; color: var(--line); white-space: nowrap; }

.plots { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin: 1.6rem 0; }
.plots figure, .photo { margin: 0; }
.plots svg { width: 100%; height: auto; display: block; overflow: visible; }
.plots figcaption, .photo figcaption { font: 500 0.9rem/1.4 "Barlow", sans-serif; color: var(--ink-muted); margin-top: 8px; }
.ax { stroke: var(--line-dim); stroke-width: 1; fill: none; }
.ext { stroke: var(--line-dim); stroke-width: 1; stroke-dasharray: 3 3; fill: none; }
.dim-ln { stroke: var(--line); stroke-width: 1.2; fill: none; }
.arrow { fill: var(--line); }
.t { font: 600 14.5px "Barlow Condensed", sans-serif; letter-spacing: 0.05em; fill: var(--ink-muted); }

.photo { margin: 1.6rem 0; }
.photo img { width: 100%; height: auto; display: block; border: 1px solid var(--line); background: var(--ground-deep); }
.pending-box {
  aspect-ratio: 16 / 9; display: grid; place-items: center;
  border: 1px dashed var(--line-dim);
}
.pending-box span { background: var(--ground); padding: 4px 10px; font: 500 0.95rem "Barlow Condensed", sans-serif; color: var(--ink-muted); letter-spacing: 0.1em; text-transform: uppercase; }
.links { margin: 1.4rem 0 0; font-weight: 500; }

.flow { list-style: none; margin: 1.4rem 0; padding: 0; display: grid; gap: 0; max-width: 44ch; }
.flow li { position: relative; padding: 9px 14px; border: 1px solid var(--line-dim); margin-bottom: 14px; font-size: 0.98rem; }
.flow li:not(:last-child)::after { content: ""; position: absolute; left: 24px; top: 100%; width: 1px; height: 14px; background: var(--line-dim); }
.flow .gate { border-color: var(--pencil); color: var(--pencil); font: 600 1rem "Barlow Condensed", sans-serif; letter-spacing: 0.12em; text-transform: uppercase; }

.switch { display: grid; grid-template-columns: 1fr 1fr; margin: 1.4rem 0; border: 1px solid var(--line-dim); }
.switch div { padding: 14px 16px; }
.switch div + div { border-left: 1px solid var(--line-dim); }
.switch p { margin: 0.4rem 0 0; font-size: 0.95rem; color: var(--ink-muted); }

/* ---------- ascent legs ---------- */
.roles { list-style: none; padding: 0; margin: 0; }
.roles li { padding: 14px 0; border-top: 1px solid var(--line-faint); }
.roles li:first-child { border-top: 0; padding-top: 0; }
.roles strong { font: 600 1.15rem/1.2 "Barlow Condensed", sans-serif; letter-spacing: 0.05em; text-transform: uppercase; }
.roles span { margin-left: 10px; font: 500 0.95rem "Barlow Condensed", sans-serif; letter-spacing: 0.06em; color: var(--ink-muted); white-space: nowrap; }
.roles p { margin: 0.35rem 0 0; color: var(--ink-muted); }

.contact { display: grid; grid-template-columns: 200px 1fr; gap: 28px; align-items: start; margin-top: 1.4rem; }
.contact .lead { margin-top: 0; }
.portrait { margin: 0; border: 1px solid var(--line); padding: 5px; background: var(--ground-deep); }
.portrait img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 5; object-fit: cover; object-position: 50% 20%; }
.bom-h { margin-top: 3.2rem; }

/* ---------- drawing ---------- */
.ln { fill: none; stroke: var(--line); stroke-width: 1.5; stroke-linejoin: round; stroke-linecap: round; }
.ln.fillg { fill: var(--ground); }
.ln.thin { stroke-width: 1; stroke: var(--line-dim); }
.ln.hid { stroke-width: 1; stroke: var(--line-dim); stroke-dasharray: 5 3; opacity: 0.55; transition: opacity 0.5s; }
.ln.center { stroke-width: 1; stroke: var(--line-dim); stroke-dasharray: 14 3 3 3; }
.ln.dim { stroke: var(--line-dim); stroke-width: 1.2; }
.ln.leader { stroke-width: 1; }
.ground-fill { opacity: 0.5; }
.hatch-ln, .lat-ln { stroke: var(--line-dim); stroke-width: 1; fill: none; }
.lat-ln { stroke-width: 1; opacity: 0.7; }
.tick-ln { stroke: var(--line-dim); stroke-width: 1; }
.band-fill { opacity: 0.65; }
.hit { fill: transparent; stroke: none; pointer-events: all; }
.dot { fill: var(--line); }
.ruler { opacity: 0; transition: opacity 0.4s; }
.lbl { font: 600 14px "Barlow Condensed", sans-serif; letter-spacing: 0.1em; fill: var(--line); }
.sub { font: 500 14px "Barlow", sans-serif; fill: var(--ink-muted); }

.part { transform-box: fill-box; transform-origin: center; transition: transform 0.6s var(--ease); cursor: pointer; }
.part.on .ln:not(.hid):not(.thin) { stroke: var(--pencil); }
.part.on .ln.hid { stroke: var(--pencil); opacity: 0.9; }
.part.on .band-fill { opacity: 0.9; }
#tower.on { transform: translateX(-16px); }
#fairing.on { transform: translateY(-44px); }
#iu.on { transform: scale(1.22); }
#ring.on { transform: scale(1.3); }

.flame { opacity: 0; }
.flame-ln { stroke-dasharray: 6 4; animation: flicker 0.35s linear infinite; }
@keyframes flicker { to { stroke-dashoffset: -20; } }

.callouts, .brackets { opacity: 0; transition: opacity 0.45s; pointer-events: none; }
[data-mode="systems"] .callouts { opacity: 1; pointer-events: auto; }
[data-mode="systems"] .ln.hid { opacity: 1; }
[data-mode="ascent"] .brackets { opacity: 1; }
[data-mode="ascent"] .ruler, [data-mode="release"] .ruler { opacity: 1; }
.callout { cursor: pointer; }
.callout .dot { transition: fill 0.2s; }
.callout.on .lbl, .callout.on .dot { fill: var(--pencil); }
.callout.on .leader { stroke: var(--pencil); }
.bracket { transition: none; }
.bracket .ln, .bracket .lbl { transition: stroke 0.3s, fill 0.3s; }
.bracket.on .ln { stroke: var(--pencil); }
.bracket.on .lbl { fill: var(--pencil); }
.orbit { opacity: 0; transition: opacity 0.6s; }

/* line draw-in on load (JS only) */
.js .draw { stroke-dasharray: 1; stroke-dashoffset: 1; }
.js.drawn .draw { stroke-dashoffset: 0; transition: stroke-dashoffset 1.8s var(--ease); }

@media (prefers-reduced-motion: reduce) {
  .js .draw { stroke-dasharray: none; stroke-dashoffset: 0; }
  .js.drawn .draw, .part, .callouts, .brackets, .ruler, .orbit { transition: none; }
  .flame-ln { animation: none; }
}

/* ---------- narrow ---------- */
@media (max-width: 859px) {
  .sheet { grid-template-columns: 34vw minmax(0, 1fr); }
  .stage { padding: 14px 0 14px 14px; }
  .content { padding: 0 20px 0 14px; }
  .callouts, .brackets { display: none; }
  .ro-part.show { display: inline; }
  .lead { font-size: 1.1rem; }
  .hud { top: 18px; right: 18px; }
  .jump { display: none; }
  .readout { padding: 4px 8px; gap: 10px; font-size: 10px; }
  .zones { display: none; }
  .frame { inset: 6px; }
  h1 { font-size: clamp(2.6rem, 14vw, 3.6rem); }
  .hero { padding-block: 70px 40px; }
  .spec { grid-template-columns: 1fr; }
  .spec dt { border-bottom: 0; padding-bottom: 0; }
  .spec dd { padding-top: 2px; }
  .titleblock { grid-template-columns: 1fr 1fr; }
  .titleblock div:first-child { grid-column: 1 / -1; border-right: 0; border-bottom: 1px solid var(--line-dim); }
  .contact { grid-template-columns: 1fr; gap: 20px; }
  .portrait { max-width: 200px; }
  .switch { grid-template-columns: 1fr; }
  .switch div + div { border-left: 0; border-top: 1px solid var(--line-dim); }
  .detail { min-height: 40vh; }
  .roles span { display: block; margin: 2px 0 0; }
}
[data-mode="ascent"] .orbit { opacity: 0 !important; }

/* signal ping from the payload antenna, Contact sheet only */
.ping { opacity: 0; transition: opacity 0.4s; }
[data-mode="release"] .ping { opacity: 1; }
.ping-arc { fill: none; stroke: var(--line); stroke-width: 1.4; stroke-dasharray: 5 3; stroke-linecap: round; vector-effect: non-scaling-stroke; opacity: 0; transform: scale(var(--s)); }
.ping-on .ping-arc { animation: ping 1.9s ease-out 2; }
.ping-on .ping-arc:nth-child(2) { animation-delay: 0.3s; }
.ping-on .ping-arc:nth-child(3) { animation-delay: 0.6s; }
@keyframes ping {
  0% { transform: scale(0.4); opacity: 0; }
  20% { opacity: 0.9; }
  70% { opacity: 0.4; }
  100% { transform: scale(3.4); opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  [data-mode="release"] .ping-arc { opacity: 0.5; }
  .ping-on .ping-arc { animation: none; }
}