:root{
  --coal:#090b0b;
  --coal-soft:#101414;
  --panel:#181d1e;
  --panel-2:#222829;
  --avionics:#323a3c;
  --line:#485153;
  --text:#eeeadf;
  --muted:#a9afa9;
  --amber:#f0a63a;
  --amber-soft:#c98229;
  --cyan:#65c9c5;
  --alert:#cc6944;
  --display:"Bahnschrift Condensed","Arial Narrow","Microsoft YaHei UI",sans-serif;
  --body:"Microsoft YaHei UI","Microsoft YaHei",sans-serif;
  --utility:"Consolas","Lucida Console",monospace;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--coal)}
body{
  margin:0;
  min-height:100dvh;
  color:var(--text);
  background:
    linear-gradient(rgba(255,255,255,.018) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.018) 1px,transparent 1px),
    var(--coal);
  background-size:48px 48px;
  font-family:var(--body);
  line-height:1.72;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.shell{width:min(1180px,calc(100% - 40px));margin-inline:auto}

.site-header{
  position:sticky;
  top:0;
  z-index:30;
  border-bottom:1px solid #343b3d;
  background:rgba(9,11,11,.92);
  backdrop-filter:blur(16px);
}
.nav{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--display);font-size:23px;font-weight:800;letter-spacing:.08em;white-space:nowrap}
.brand img{width:34px;height:34px;object-fit:contain}
.nav-links{display:flex;align-items:center;gap:22px;color:#c1c3bd;font-size:14px;font-weight:700;white-space:nowrap}
.nav-links a{position:relative}
.nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:-9px;height:2px;background:var(--amber);transition:right .2s ease}
.nav-links a:hover::after{right:0}
.cta,.panel-button{
  display:inline-flex;
  min-width:136px;
  min-height:46px;
  align-items:center;
  justify-content:center;
  border:1px solid #ffc269;
  border-radius:3px;
  color:#17110a;
  background:var(--amber);
  box-shadow:inset 0 0 0 2px rgba(33,21,6,.22),0 10px 28px rgba(240,166,58,.15);
  font-weight:900;
  white-space:nowrap;
  word-break:keep-all;
  writing-mode:horizontal-tb;
  transition:transform .18s ease,background .18s ease;
}
.cta{min-height:42px;padding:0 22px;font-size:14px}
.panel-button{padding:0 26px}
.cta:hover,.panel-button:hover{transform:translateY(-2px);background:#f5b34f}
a:focus-visible,summary:focus-visible{outline:3px solid var(--cyan);outline-offset:4px}

.cockpit-hero{padding:clamp(46px,7vw,86px) 0 clamp(72px,9vw,122px);overflow:hidden}
.hero-intro{display:grid;grid-template-columns:1.15fr .85fr;align-items:end;gap:clamp(34px,7vw,94px);margin-bottom:42px}
.eyebrow{
  display:flex;
  align-items:center;
  gap:12px;
  margin:0 0 14px;
  color:var(--amber);
  font-family:var(--utility);
  font-size:12px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
}
.eyebrow>span{display:block;width:36px;height:3px;background:var(--amber);box-shadow:12px 0 0 -1px var(--amber-soft)}
.hero-intro h1{
  max-width:13ch;
  margin:0;
  font-family:var(--display);
  font-size:clamp(48px,7.6vw,92px);
  line-height:.94;
  letter-spacing:-.045em;
}
.hero-brief{padding-left:25px;border-left:1px solid var(--line)}
.hero-brief p{margin:0 0 24px;color:var(--muted);font-size:16px}

.cockpit-window{
  position:relative;
  padding:10px 10px 20px;
  border:1px solid #3c4446;
  border-top:6px solid #697275;
  border-radius:58px 58px 15px 15px;
  background:linear-gradient(180deg,#252b2d 0,#131717 12%,#0b0e0e 100%);
  box-shadow:0 42px 90px rgba(0,0,0,.5),inset 0 0 0 2px #080a0a,inset 0 8px 25px rgba(255,255,255,.035);
}
.cockpit-window::before,.cockpit-window::after{
  content:"";
  position:absolute;
  top:46px;
  bottom:44px;
  width:18px;
  border:1px solid #41494b;
  background:repeating-linear-gradient(0deg,#202526 0 20px,#0c0f0f 21px 24px);
}
.cockpit-window::before{left:-18px;border-radius:11px 0 0 11px}
.cockpit-window::after{right:-18px;border-radius:0 11px 11px 0}
.window-rail{
  min-height:42px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:0 32px;
  border-bottom:1px solid #394143;
  color:#8f9796;
  font-family:var(--utility);
  font-size:10px;
  letter-spacing:.08em;
}
.window-rail strong{
  padding:5px 12px;
  border:1px solid rgba(240,166,58,.45);
  color:var(--amber);
  background:rgba(240,166,58,.06);
  font-weight:700;
}
.cockpit-grid{
  display:grid;
  grid-template-columns:minmax(190px,.72fr) minmax(340px,1.15fr) minmax(190px,.72fr);
  align-items:center;
  gap:12px;
  padding:16px 18px 18px;
}
.side-console{
  min-width:0;
  border:1px solid #353e40;
  border-radius:8px;
  background:linear-gradient(145deg,#1d2324,#101313);
  box-shadow:inset 0 0 0 3px #0b0e0e;
}
.console-label{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  min-height:42px;
  padding:0 14px;
  border-bottom:1px solid #353e40;
  color:#d5d5cc;
  font-family:var(--display);
  font-weight:800;
  letter-spacing:.08em;
}
.console-label b{color:var(--cyan);font-family:var(--utility);font-size:9px;font-weight:700}
.selector-dial{
  position:relative;
  width:112px;
  aspect-ratio:1;
  display:grid;
  place-items:center;
  margin:24px auto;
  border:1px solid #576063;
  border-radius:50%;
  background:
    repeating-conic-gradient(from -40deg,var(--amber) 0 1deg,transparent 1deg 14deg),
    radial-gradient(circle at center,#252c2d 0 39%,#0d1010 40% 56%,#353d3f 57% 60%,#111515 61%);
}
.selector-dial::before{content:"";position:absolute;width:62%;aspect-ratio:1;border:1px solid #7a8586;border-radius:50%;box-shadow:0 0 24px rgba(240,166,58,.1)}
.selector-dial i{position:absolute;top:12px;width:3px;height:24px;border-radius:2px;background:var(--amber);transform:rotate(23deg);transform-origin:50% 44px}
.selector-dial em{position:relative;color:var(--text);font-family:var(--display);font-size:18px;font-style:normal;font-weight:800}
.route-console ul{margin:0;padding:0 14px 16px;list-style:none}
.route-console li{display:flex;justify-content:space-between;gap:12px;padding:11px 2px;border-top:1px solid #303839}
.route-console li span{color:#d5d5cc;font-size:12px;font-weight:700}
.route-console li small{max-width:10ch;color:#788181;font-size:9px;text-align:right}

.primary-display{
  min-width:0;
  padding:9px;
  border:1px solid #596466;
  border-radius:24px 24px 7px 7px;
  background:#050707;
  box-shadow:0 0 0 4px #1c2223,0 0 0 5px #080a0a,inset 0 0 50px rgba(101,201,197,.06);
}
.display-caption{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  min-height:30px;
  padding:0 11px;
  color:#73807f;
  font-family:var(--utility);
  font-size:9px;
  letter-spacing:.06em;
}
.display-caption b{color:var(--cyan);font-weight:700}
.primary-display figure{
  max-width:390px;
  margin:0 auto;
  padding:0;
  align-self:center;
  background:radial-gradient(circle,rgba(101,201,197,.08),transparent 68%);
}
.display-footer{display:flex;flex-wrap:wrap;justify-content:center;gap:7px;padding:10px 8px 5px}
.display-footer span{padding:4px 7px;border:1px solid #303a3b;color:#818b8a;font-family:var(--utility);font-size:8px}

.phase-list{margin:0;padding:16px 15px 10px;list-style:none}
.phase-list li{position:relative;display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid #303839}
.phase-list i{
  width:26px;
  aspect-ratio:1;
  flex:0 0 auto;
  border:1px solid #566062;
  border-radius:50%;
  background:radial-gradient(circle,var(--cyan) 0 2px,transparent 3px);
  box-shadow:inset 0 0 0 5px #151a1a;
}
.phase-list strong,.phase-list small{display:block}
.phase-list strong{font-size:12px}.phase-list small{color:#7f8887;font-size:9px}
.stage-strip{display:flex;align-items:center;justify-content:center;gap:7px;margin:12px 14px;padding:10px;border:1px solid #303839;color:var(--amber);font-family:var(--utility);font-size:9px}
.stage-strip i{width:12px;height:1px;background:#596263}
.check-console>p{margin:0;padding:0 16px 17px;color:#737c7c;font-size:9px;line-height:1.6}
.window-base{display:flex;align-items:center;justify-content:center;gap:12px;color:#747d7d;font-family:var(--utility);font-size:9px}
.window-base i{width:9px;height:9px;border:1px solid #647072;border-radius:50%;box-shadow:inset 0 0 0 2px #171b1c}
.window-base i:nth-child(2){margin-right:12px}.window-base i:nth-last-child(2){margin-left:12px}

.preflight-section{padding:clamp(76px,10vw,132px) 0;background:#111515;border-block:1px solid #2d3435}
.preflight-layout{display:grid;grid-template-columns:.78fr 1.22fr;gap:clamp(42px,8vw,104px);align-items:start}
.section-instrument{position:sticky;top:110px}
.section-instrument h2,.mode-heading h2,.systems-copy h2,.help-panel h2{
  margin:0;
  font-family:var(--display);
  font-size:clamp(38px,5.4vw,68px);
  line-height:1.02;
  letter-spacing:-.035em;
}
.section-instrument>p:last-child{max-width:38ch;margin:24px 0 0;color:var(--muted)}
.checklist{margin:0;padding:0;border-top:1px solid var(--line);list-style:none}
.checklist li{
  display:grid;
  grid-template-columns:92px 1fr 64px;
  align-items:center;
  gap:22px;
  min-height:130px;
  border-bottom:1px solid var(--line);
}
.checklist b{color:var(--amber);font-family:var(--utility);font-size:11px;letter-spacing:.07em}
.checklist h3{margin:0 0 5px;font-size:20px}
.checklist p{margin:0;color:var(--muted);font-size:14px}
.checklist>li>span{display:grid;place-items:center;width:54px;aspect-ratio:1;border:1px solid #596264;border-radius:50%;color:#aeb3ae;font-family:var(--utility);font-size:10px}

.mode-section{padding:clamp(80px,11vw,146px) 0;background:var(--coal)}
.mode-heading{display:grid;grid-template-columns:1fr .65fr;align-items:end;gap:48px;margin-bottom:46px}
.mode-heading>p{margin:0 0 4px;color:var(--muted);font-size:14px}
.mode-track{position:relative;border-top:2px solid #586163}
.mode-track::before{content:"";position:absolute;top:-2px;left:0;width:34%;height:2px;background:var(--amber);box-shadow:0 0 14px rgba(240,166,58,.35)}
.mode-track article{
  display:grid;
  grid-template-columns:76px 1fr 160px;
  align-items:center;
  gap:26px;
  min-height:138px;
  border-bottom:1px solid #353d3f;
}
.mode-index{display:grid;place-items:center;width:48px;aspect-ratio:1;border:1px solid #657073;border-radius:50%;color:var(--cyan);font-family:var(--utility);font-weight:700;box-shadow:inset 0 0 0 7px #141818}
.mode-track h3{margin:0 0 6px;font-size:22px}
.mode-track p{margin:0;color:var(--muted);font-size:14px}
.mode-track em{justify-self:end;color:#9fa6a3;font-family:var(--utility);font-size:11px;font-style:normal}

.systems-section{padding:clamp(60px,8vw,100px) 0;background:#202627}
.systems-panel{display:grid;grid-template-columns:.7fr 1.3fr;align-items:center;gap:clamp(36px,6vw,82px)}
.systems-copy p:not(.eyebrow){margin:24px 0;color:#b0b5b1}
.systems-visual{position:relative;align-self:center;min-width:0;margin:0;padding:0;border:1px solid #4a5557;background:#101414}
.visual-warning{padding:10px 15px;border-bottom:1px solid #3b4446;color:var(--cyan);font-family:var(--utility);font-size:10px;letter-spacing:.07em}

.help-section{padding:clamp(84px,11vw,148px) 0;background:#0d1010}
.help-panel{display:grid;grid-template-columns:.72fr 1.28fr;gap:clamp(42px,8vw,104px)}
.help-panel header{align-self:start;padding-top:8px}
.text-link{display:inline-block;margin-top:24px;color:var(--amber);font-weight:800}
.warning-stack{border-top:1px solid #50595b}
.warning-stack details{border-bottom:1px solid #3b4446}
.warning-stack summary{display:flex;align-items:center;gap:18px;padding:25px 2px;cursor:pointer;list-style:none;font-size:17px;font-weight:800}
.warning-stack summary::-webkit-details-marker{display:none}
.warning-stack summary::after{content:"+";margin-left:auto;color:var(--amber);font-family:var(--utility);font-size:24px;font-weight:400}
.warning-stack details[open] summary::after{content:"−"}
.warning-stack summary span{min-width:70px;padding:4px 7px;border:1px solid rgba(204,105,68,.65);color:#e08a68;background:rgba(204,105,68,.08);font-family:var(--utility);font-size:9px;text-align:center}
.warning-stack p{margin:0 0 26px;padding-left:90px;color:var(--muted)}

.departure-strip{padding:42px 0;border-block:1px solid #424b4d;background:#171c1d}
.departure-strip>.shell{display:grid;grid-template-columns:150px 1fr auto;align-items:center;gap:34px}
.departure-strip p{margin:0 0 4px;color:var(--cyan);font-family:var(--utility);font-size:10px;letter-spacing:.12em}
.departure-strip h2{margin:0;font-family:var(--display);font-size:clamp(28px,4vw,46px)}
.departure-marker{display:flex;align-items:center}
.departure-marker i{width:28px;height:1px;background:#687274}.departure-marker span{width:50px;aspect-ratio:1;border:1px solid var(--amber);border-radius:50%;background:radial-gradient(circle,var(--amber) 0 3px,transparent 4px)}

.site-footer{padding:54px 0 28px;border-top:1px solid #31393a;background:#090b0b}
.footer-grid{display:grid;grid-template-columns:1.3fr .7fr .7fr;gap:38px}
.footer-grid h2,.footer-grid h3{margin-top:0;font-family:var(--display);letter-spacing:.04em}
.footer-grid p,.footer-grid a{color:#939a96}
.footer-grid p{max-width:38ch}.footer-grid a{display:block;margin:7px 0}
.footer-grid a:hover{color:var(--amber)}
.copyright{margin-top:30px;padding-top:22px;border-top:1px solid #2b3132;color:#707875;font-family:var(--utility);font-size:11px}

@media(max-width:980px){
  .nav{padding:12px 0;flex-wrap:wrap}.nav-links{order:3;width:100%;overflow-x:auto;padding-bottom:5px}
  .hero-intro,.preflight-layout,.mode-heading,.systems-panel,.help-panel{grid-template-columns:1fr}
  .section-instrument{position:static}
  .cockpit-grid{grid-template-columns:1fr 1.25fr}.check-console{grid-column:1/-1}.check-console .phase-list{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.check-console .phase-list li{border-bottom:0}
  .mode-heading{gap:22px}
  .departure-strip>.shell{grid-template-columns:100px 1fr}.departure-strip .panel-button{grid-column:2;justify-self:start}
}

@media(max-width:700px){
  .shell{width:min(100% - 24px,1180px)}
  .nav>.cta{display:none}
  .hero-intro{gap:24px}.hero-brief{padding:20px 0 0;border-left:0;border-top:1px solid var(--line)}
  .cockpit-window{border-radius:28px 28px 10px 10px}
  .cockpit-window::before,.cockpit-window::after{display:none}
  .window-rail{padding:7px 12px;flex-wrap:wrap;justify-content:center}.window-rail span{display:none}
  .cockpit-grid{grid-template-columns:1fr;padding-inline:7px}.primary-display{order:-1}.check-console{grid-column:auto}
  .check-console .phase-list{grid-template-columns:1fr}
  .checklist li{grid-template-columns:70px 1fr;gap:15px;padding:18px 0}.checklist>li>span{display:none}
  .mode-track article{grid-template-columns:54px 1fr;gap:14px;padding:20px 0}.mode-track em{grid-column:2;justify-self:start}
  .warning-stack summary{gap:10px;font-size:15px}.warning-stack summary span{min-width:60px}.warning-stack p{padding-left:0}
  .departure-strip>.shell{grid-template-columns:1fr}.departure-marker{display:none}.departure-strip .panel-button{grid-column:auto}
  .footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/-1}
}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .nav-links a::after,.cta,.panel-button{transition:none}
}

/* Hero media natural-ratio final override */
.cockpit-grid{align-items:center}
.primary-display,.primary-display figure{align-self:center;height:auto}
.primary-display figure{padding:0;margin-top:0;margin-bottom:0;overflow:visible;transform:none}
.primary-display img,.systems-visual img{
  display:block;
  width:100%;
  height:auto;
  min-height:0;
  max-height:none;
  margin:0;
  padding:0;
  object-fit:contain;
  object-position:center;
  clip-path:none;
  transform:none;
}