/* Interactive, simulation-only learning lab for /space-ai/propellant/. */
.pl-section {
  background:
    radial-gradient(circle at 88% 8%, rgba(95,208,192,.13), transparent 28rem),
    linear-gradient(180deg, #101a31 0%, #111d36 100%);
  color:#f7f4ec;
  overflow:hidden;
}
.pl-section + .sa-section { border-top:0; }
.pl-section .sa-h2 { color:#fffdf8; }
.pl-section .sa-lead { color:rgba(247,244,236,.78); }
.pl-section .sa-eyebrow {
  color:#a5eadf;
  background:rgba(14,113,104,.24);
  border-color:rgba(95,208,192,.32);
}
.pl-boundary {
  display:flex;
  gap:.75rem;
  align-items:flex-start;
  margin:1.25rem 0 1.5rem;
  padding:.9rem 1rem;
  border:1px solid rgba(201,162,39,.4);
  border-radius:12px;
  background:rgba(201,162,39,.09);
  color:rgba(247,244,236,.84);
  font-size:.88rem;
  line-height:1.65;
}
.pl-boundary svg { flex:0 0 auto; margin-top:.15rem; color:#e5c95f; }
.pl-lab {
  --pl-fuel:#5fd0c0;
  --pl-oxidizer:#f0b85b;
  border:1px solid rgba(255,255,255,.13);
  border-radius:22px;
  background:rgba(7,14,29,.72);
  box-shadow:0 30px 70px rgba(0,0,0,.28);
  overflow:hidden;
}
.pl-toolbar {
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding:.85rem 1.1rem;
  border-bottom:1px solid rgba(255,255,255,.11);
  background:rgba(255,255,255,.035);
}
.pl-toolbar-title {
  display:flex;
  align-items:center;
  gap:.65rem;
  min-width:0;
  font-family:var(--mono);
  font-size:.76rem;
  letter-spacing:.06em;
  color:rgba(247,244,236,.72);
}
.pl-status-dot {
  width:.62rem;
  height:.62rem;
  flex:0 0 auto;
  border-radius:50%;
  background:#5fd0c0;
  box-shadow:0 0 0 5px rgba(95,208,192,.11), 0 0 18px rgba(95,208,192,.55);
}
.pl-model-badge {
  flex:0 0 auto;
  border:1px solid rgba(255,255,255,.18);
  border-radius:999px;
  padding:.28rem .65rem;
  color:rgba(247,244,236,.7);
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.05em;
}
.pl-cockpit {
  display:grid;
  grid-template-columns:minmax(0,1.08fr) minmax(240px,.72fr);
}
.pl-visual {
  padding:1.35rem;
  border-right:1px solid rgba(255,255,255,.1);
}
.pl-kicker {
  margin:0 0 .65rem;
  color:#8fe0d3;
  font-family:var(--mono);
  font-size:.68rem;
  font-weight:600;
  letter-spacing:.11em;
  text-transform:uppercase;
}
.pl-preset-list {
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:.55rem;
  margin-bottom:1rem;
}
.pl-preset {
  appearance:none;
  width:100%;
  padding:.72rem .78rem;
  border:1px solid rgba(255,255,255,.14);
  border-radius:11px;
  background:rgba(255,255,255,.035);
  color:#f7f4ec;
  text-align:left;
  cursor:pointer;
  transition:border-color .18s, background .18s, transform .18s;
}
.pl-preset:hover { transform:translateY(-1px); border-color:rgba(95,208,192,.48); }
.pl-preset[aria-pressed="true"] {
  border-color:#5fd0c0;
  background:linear-gradient(135deg, rgba(14,113,104,.38), rgba(95,208,192,.08));
  box-shadow:inset 0 0 0 1px rgba(95,208,192,.12);
}
.pl-preset strong { display:block; font-size:.84rem; line-height:1.35; }
.pl-preset span { display:block; margin-top:.15rem; color:rgba(247,244,236,.58); font-family:var(--mono); font-size:.65rem; }
.pl-stage {
  display:grid;
  grid-template-columns:minmax(215px,.75fr) minmax(0,1.25fr);
  gap:1rem;
  align-items:center;
  min-height:300px;
  padding:1rem;
  border:1px solid rgba(255,255,255,.1);
  border-radius:16px;
  background:
    radial-gradient(circle at 22% 40%, rgba(95,208,192,.11), transparent 12rem),
    linear-gradient(rgba(255,255,255,.018),rgba(255,255,255,.018)),
    repeating-linear-gradient(0deg,transparent 0 31px,rgba(255,255,255,.025) 32px),
    repeating-linear-gradient(90deg,transparent 0 31px,rgba(255,255,255,.025) 32px);
}
.pl-rocket-wrap { position:relative; min-height:270px; display:grid; place-items:center; }
.pl-orbit {
  position:absolute;
  width:210px;
  height:210px;
  border:1px dashed rgba(255,255,255,.09);
  border-radius:50%;
}
.pl-rocket { width:132px; height:270px; overflow:visible; filter:drop-shadow(0 18px 24px rgba(0,0,0,.36)); }
.pl-rocket .pl-flame-core {
  transform-box:fill-box;
  transform-origin:center top;
  transform:scaleY(var(--flame-scale, .78));
  transition:transform .28s ease;
  animation:pl-pulse .28s ease-in-out infinite alternate;
}
@keyframes pl-pulse { to { opacity:.82; filter:saturate(1.22); } }
.pl-chemistry { min-width:0; }
.pl-pair-name { margin:0; color:#fff; font-size:1.2rem; font-weight:800; line-height:1.3; }
.pl-pair-use { margin:.25rem 0 .85rem; color:rgba(247,244,236,.61); font-size:.76rem; line-height:1.55; }
.pl-flow {
  display:grid;
  grid-template-columns:1fr auto 1fr;
  gap:.45rem;
  align-items:center;
  margin-bottom:1rem;
}
.pl-tank {
  min-width:0;
  border-radius:12px;
  padding:.65rem .7rem;
  background:rgba(255,255,255,.045);
  border:1px solid rgba(255,255,255,.11);
}
.pl-tank.fuel { border-top:3px solid var(--pl-fuel); }
.pl-tank.oxidizer { border-top:3px solid var(--pl-oxidizer); }
.pl-tank span { display:block; color:rgba(247,244,236,.54); font-family:var(--mono); font-size:.62rem; text-transform:uppercase; }
.pl-tank strong { display:block; overflow:hidden; margin-top:.2rem; color:#fff; font-size:.9rem; text-overflow:ellipsis; white-space:nowrap; }
.pl-flow-arrow { color:rgba(247,244,236,.38); font-family:var(--mono); }
.pl-periodic-label { display:flex; justify-content:space-between; gap:.5rem; align-items:end; margin:.1rem 0 .5rem; }
.pl-periodic-label span { color:rgba(247,244,236,.72); font-size:.72rem; font-weight:700; }
.pl-periodic-label a { color:#8fe0d3; font-size:.62rem; }
.pl-periodic-wrap { overflow-x:auto; overscroll-behavior-x:contain; }
.pl-periodic {
  display:grid;
  grid-template-columns:repeat(18,minmax(0,1fr));
  grid-template-rows:repeat(3,2.7rem);
  gap:3px;
  min-width:0;
}
.pl-element {
  position:relative;
  display:flex;
  align-items:flex-end;
  justify-content:center;
  min-width:0;
  padding:.16rem;
  border:1px solid rgba(255,255,255,.13);
  border-radius:5px;
  background:rgba(255,255,255,.035);
  color:rgba(247,244,236,.36);
  font-family:var(--mono);
  font-size:.66rem;
  font-weight:600;
  transition:background .2s,border-color .2s,box-shadow .2s,color .2s;
}
.pl-element small { position:absolute; top:1px; left:3px; font-size:.43rem; font-weight:400; opacity:.75; }
.pl-element[data-element="H"] { grid-column:1; grid-row:1; }
.pl-element[data-element="C"] { grid-column:14; grid-row:2; }
.pl-element[data-element="N"] { grid-column:15; grid-row:2; }
.pl-element[data-element="O"] { grid-column:16; grid-row:2; }
.pl-element[data-element="Al"] { grid-column:13; grid-row:3; }
.pl-element[data-element="He"] { grid-column:18; grid-row:1; }
.pl-element[data-element="Ne"] { grid-column:18; grid-row:2; }
.pl-element.is-fuel {
  color:#eafffb;
  border-color:var(--pl-fuel);
  background:rgba(95,208,192,.2);
  box-shadow:0 0 16px rgba(95,208,192,.16);
}
.pl-element.is-oxidizer {
  color:#fff3de;
  border-color:var(--pl-oxidizer);
  background:rgba(240,184,91,.18);
  box-shadow:0 0 16px rgba(240,184,91,.14);
}
.pl-element.is-both { background:linear-gradient(135deg,rgba(95,208,192,.22),rgba(240,184,91,.22)); }
.pl-element.is-dataset { color:rgba(247,244,236,.67); border-style:dashed; }
.pl-element-note { min-height:2.8em; margin:.55rem 0 0; color:rgba(247,244,236,.58); font-size:.68rem; line-height:1.45; }
.pl-controls { padding:1.35rem; background:rgba(255,255,255,.025); }
.pl-control + .pl-control { margin-top:1.05rem; }
.pl-control-head { display:flex; justify-content:space-between; gap:.5rem; align-items:baseline; margin-bottom:.3rem; }
.pl-control label { color:rgba(247,244,236,.8); font-size:.76rem; font-weight:700; }
.pl-control output { color:#8fe0d3; font-family:var(--mono); font-size:.72rem; }
.pl-control input[type="range"] { width:100%; height:4px; accent-color:#5fd0c0; cursor:pointer; }
.pl-control-help { margin:.25rem 0 0; color:rgba(247,244,236,.43); font-size:.62rem; line-height:1.45; }
.pl-results { display:grid; grid-template-columns:1fr 1fr; gap:.55rem; margin-top:1.25rem; }
.pl-result {
  padding:.75rem;
  border:1px solid rgba(255,255,255,.11);
  border-radius:11px;
  background:rgba(255,255,255,.04);
}
.pl-result:first-child { grid-column:1/-1; background:rgba(14,113,104,.15); border-color:rgba(95,208,192,.25); }
.pl-result span { display:block; color:rgba(247,244,236,.5); font-family:var(--mono); font-size:.6rem; text-transform:uppercase; }
.pl-result strong { display:block; margin-top:.18rem; color:#fff; font-family:var(--mono); font-size:1rem; font-weight:600; }
.pl-equation {
  margin:1rem 0 0;
  padding:.7rem .8rem;
  border-left:3px solid #c9a227;
  background:rgba(201,162,39,.075);
  color:rgba(247,244,236,.68);
  font-family:var(--mono);
  font-size:.63rem;
  line-height:1.65;
}
.pl-warning { min-height:1.45em; margin:.55rem 0 0; color:#f1c87c; font-size:.65rem; line-height:1.45; }
.pl-isru {
  padding:1.35rem;
  border-top:1px solid rgba(255,255,255,.11);
}
.pl-isru-head { display:flex; justify-content:space-between; gap:1rem; align-items:start; margin-bottom:.9rem; }
.pl-isru-head h3 { margin:0; color:#fff; font-size:1.1rem; }
.pl-isru-head p { max-width:58ch; margin:.15rem 0 0; color:rgba(247,244,236,.58); font-size:.72rem; line-height:1.6; }
.pl-resource-tabs { display:flex; flex-wrap:wrap; gap:.45rem; margin-bottom:1rem; }
.pl-resource-tab {
  appearance:none;
  padding:.48rem .72rem;
  border:1px solid rgba(255,255,255,.14);
  border-radius:999px;
  background:transparent;
  color:rgba(247,244,236,.72);
  font-size:.72rem;
  font-weight:700;
  cursor:pointer;
}
.pl-resource-tab[aria-pressed="true"] { border-color:#c9a227; background:rgba(201,162,39,.14); color:#fff4ce; }
.pl-isru-body { display:grid; grid-template-columns:minmax(0,1.35fr) minmax(220px,.65fr); gap:.8rem; }
.pl-process {
  display:flex;
  align-items:stretch;
  gap:.35rem;
  min-width:0;
  overflow-x:auto;
  padding-bottom:.25rem;
}
.pl-process-step {
  flex:1 0 112px;
  min-width:0;
  padding:.65rem;
  border:1px solid rgba(255,255,255,.1);
  border-radius:10px;
  background:rgba(255,255,255,.035);
}
.pl-process-step span { display:block; color:#e5c95f; font-family:var(--mono); font-size:.55rem; }
.pl-process-step strong { display:block; margin-top:.2rem; color:rgba(247,244,236,.83); font-size:.69rem; line-height:1.4; }
.pl-process-arrow { align-self:center; color:rgba(247,244,236,.28); font-size:.8rem; }
.pl-verdict {
  padding:.85rem;
  border:1px solid rgba(255,255,255,.1);
  border-radius:11px;
  background:rgba(255,255,255,.035);
}
.pl-verdict-badge { display:inline-block; margin-bottom:.45rem; padding:.18rem .45rem; border-radius:999px; background:rgba(240,184,91,.15); color:#f0ce8e; font-family:var(--mono); font-size:.57rem; }
.pl-verdict h4 { margin:0 0 .25rem; color:#fff; font-size:.82rem; }
.pl-verdict p { margin:0; color:rgba(247,244,236,.6); font-size:.67rem; line-height:1.55; }
.pl-verdict a { display:inline-block; margin-top:.45rem; color:#8fe0d3; font-size:.65rem; }
.pl-sources {
  display:flex;
  flex-wrap:wrap;
  gap:.4rem .8rem;
  margin:1rem 0 0;
  padding-top:.9rem;
  border-top:1px solid rgba(255,255,255,.08);
  color:rgba(247,244,236,.43);
  font-size:.62rem;
}
.pl-sources strong { color:rgba(247,244,236,.65); }
.pl-sources a { color:#8fe0d3; }
@media (max-width:900px) {
  .pl-cockpit { grid-template-columns:1fr; }
  .pl-visual { border-right:0; border-bottom:1px solid rgba(255,255,255,.1); }
}
@media (max-width:650px) {
  .pl-lab { border-radius:16px; }
  .pl-toolbar { align-items:flex-start; flex-direction:column; }
  .pl-model-badge { white-space:nowrap; }
  .pl-visual,.pl-controls,.pl-isru { padding:1rem; }
  .pl-preset-list { grid-template-columns:1fr; }
  .pl-stage { grid-template-columns:1fr; min-height:0; }
  .pl-rocket-wrap { min-height:230px; }
  .pl-rocket { height:225px; }
  .pl-periodic { grid-template-rows:repeat(3,2.35rem); min-width:400px; }
  .pl-isru-head { display:block; }
  .pl-isru-body { grid-template-columns:1fr; }
  .pl-process-step { flex-basis:102px; }
}
@media (prefers-reduced-motion:reduce) {
  .pl-rocket .pl-flame-core { animation:none; }
  .pl-preset,.pl-element { transition:none; }
}
.pl-live {
  position:absolute;
  width:1px;
  height:1px;
  margin:-1px;
  padding:0;
  overflow:hidden;
  clip-path:inset(50%);
  white-space:nowrap;
}