/* Aerospace Reference Center */
:root{
  --aero-navy:#071a33;--aero-navy-2:#0d2b4e;--aero-blue:#1d5f91;--aero-sky:#dff1fb;
  --aero-gold:#c8a24a;--aero-ink:#102033;--aero-muted:#5b6877;--aero-line:#d9e2ec;--aero-panel:#f7f9fc
}
.aero-ref-page{background:#f3f6fa;color:var(--aero-ink)}
.aero-ref-hero{background:radial-gradient(circle at 82% 18%,rgba(95,172,221,.25),transparent 25%),radial-gradient(circle at 16% 72%,rgba(200,162,74,.15),transparent 28%),linear-gradient(135deg,var(--aero-navy),#0b2748 55%,#164b72);color:#fff;padding:4.5rem 0 4rem;border-bottom:1px solid rgba(255,255,255,.12)}
.aero-ref-hero-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(300px,.75fr);gap:2.2rem;align-items:center}
.aero-ref-hero h1{color:#fff;font-size:clamp(3rem,6vw,5.6rem);line-height:.94;letter-spacing:-.055em;max-width:900px}
.aero-ref-hero p{color:#dce8f3!important;font-size:1.12rem;max-width:760px}.aero-ref-hero .eyebrow{color:#f4d67c!important}
.aero-ref-actions{display:flex;gap:.75rem;flex-wrap:wrap;margin-top:1.4rem}
.aero-ref-stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.8rem;padding:1rem;border:1px solid rgba(255,255,255,.18);border-radius:22px;background:rgba(255,255,255,.08);backdrop-filter:blur(12px)}
.aero-ref-stat{padding:1rem;border-radius:16px;background:rgba(3,14,28,.28)}.aero-ref-stat strong{display:block;font-size:2rem;color:#fff;line-height:1}.aero-ref-stat span{display:block;margin-top:.35rem;color:#cbd9e7;font-weight:800;font-size:.78rem;text-transform:uppercase;letter-spacing:.08em}
.aero-ref-nav{position:sticky;top:0;z-index:70;background:rgba(255,255,255,.97);border-bottom:1px solid var(--aero-line);box-shadow:0 8px 24px rgba(7,26,51,.08);backdrop-filter:blur(10px)}
.aero-ref-nav-inner{display:flex;gap:.35rem;align-items:center;overflow-x:auto;scrollbar-width:none;padding:.65rem 0}.aero-ref-nav-inner::-webkit-scrollbar{display:none}
.aero-ref-nav a{flex:0 0 auto;color:var(--aero-navy);text-decoration:none;font-weight:850;font-size:.82rem;padding:.55rem .72rem;border-radius:999px}.aero-ref-nav a:hover,.aero-ref-nav a:focus{background:#eaf1f7;outline:none}
.aero-ref-section{padding:3rem 0}.aero-ref-section.alt{background:#fff;border-top:1px solid #e4eaf1;border-bottom:1px solid #e4eaf1}.aero-ref-section .section-header{margin-bottom:1.25rem}
.aero-ref-search-shell{background:#fff;border:1px solid var(--aero-line);border-radius:24px;padding:1.2rem;box-shadow:0 18px 45px rgba(7,26,51,.08)}
.aero-ref-search-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:.8rem;align-items:center}.aero-ref-search{display:flex;align-items:center;gap:.7rem;border:1px solid #bdc9d7;border-radius:15px;background:#fff;padding:.75rem .9rem}.aero-ref-search:focus-within{border-color:#4f82ac;box-shadow:0 0 0 4px rgba(79,130,172,.13)}.aero-ref-search input{width:100%;border:0;outline:0;font:inherit;color:var(--aero-ink);background:transparent}.aero-ref-search-icon{font-size:1.25rem;color:#49647d}.aero-ref-count{font-weight:900;color:var(--aero-navy);white-space:nowrap}
.aero-ref-filters{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:.85rem}.aero-ref-filter{border:1px solid #cdd7e2;background:#f7f9fc;color:#2d4055;border-radius:999px;padding:.5rem .72rem;font:inherit;font-size:.79rem;font-weight:850;cursor:pointer}.aero-ref-filter:hover,.aero-ref-filter:focus,.aero-ref-filter.active{background:var(--aero-navy);color:#fff;border-color:var(--aero-navy);outline:none}
.aero-ref-glossary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.8rem;margin-top:1.1rem}.aero-term{background:#fff;border:1px solid var(--aero-line);border-radius:16px;padding:1rem;min-height:144px;box-shadow:0 8px 20px rgba(7,26,51,.045)}.aero-term-head{display:flex;justify-content:space-between;gap:.75rem;align-items:flex-start}.aero-term-code{font-size:1.35rem;font-weight:950;letter-spacing:-.025em;color:var(--aero-navy)}.aero-term-category{font-size:.66rem;text-transform:uppercase;letter-spacing:.08em;font-weight:900;background:#eaf1f7;color:#234b70;border-radius:999px;padding:.28rem .48rem}.aero-term-name{font-weight:900;color:#20344a;margin:.35rem 0}.aero-term p{font-size:.88rem;color:var(--aero-muted);margin:0}.aero-ref-empty{padding:2rem;text-align:center;background:#fff;border:1px dashed #b9c6d3;border-radius:18px;margin-top:1rem}
.aero-topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1rem}.aero-topic-card{background:#fff;border:1px solid var(--aero-line);border-radius:20px;padding:1.2rem;box-shadow:0 10px 26px rgba(7,26,51,.055);position:relative;overflow:hidden}.aero-topic-card::before{content:"";position:absolute;inset:0 auto 0 0;width:5px;background:var(--aero-gold)}.aero-topic-card h3{color:var(--aero-navy);margin:.3rem 0 .5rem}.aero-topic-card p{color:var(--aero-muted);font-size:.92rem}.aero-topic-icon{font-size:1.65rem}.aero-kicker{font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;font-weight:950;color:#5a6a7c}
.aero-panel-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}.aero-panel{background:#fff;border:1px solid var(--aero-line);border-radius:20px;padding:1.25rem;box-shadow:0 10px 24px rgba(7,26,51,.05)}.aero-panel h3{color:var(--aero-navy);margin-bottom:.55rem}.aero-panel h4{color:#234b70;margin:1rem 0 .35rem}.aero-panel p,.aero-panel li{color:#43566a}
.aero-mini-table{width:100%;border-collapse:separate;border-spacing:0;overflow:hidden;border:1px solid var(--aero-line);border-radius:14px;margin-top:.9rem}.aero-mini-table th,.aero-mini-table td{padding:.7rem .75rem;border-bottom:1px solid var(--aero-line);font-size:.86rem}.aero-mini-table th{background:#edf3f8;color:var(--aero-navy);font-size:.72rem;letter-spacing:.06em}.aero-mini-table tr:last-child td{border-bottom:0}
.aero-formula{display:grid;gap:.55rem;margin-top:.8rem}.aero-formula div{background:#f7f9fc;border:1px solid var(--aero-line);border-radius:12px;padding:.72rem .8rem}.aero-formula strong{display:inline-block;min-width:110px;color:var(--aero-navy)}
.aero-callout{border-left:5px solid var(--aero-gold);background:#fff9ea;border-radius:12px;padding:1rem 1.1rem;color:#4c3b13}
.aero-instrument-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.9rem}.aero-instrument{background:linear-gradient(180deg,#fff,#f8fafc);border:1px solid var(--aero-line);border-radius:18px;padding:1rem}.aero-instrument strong{display:block;color:var(--aero-navy);margin-bottom:.35rem}.aero-instrument span{color:#5b6877;font-size:.88rem}
.aero-source-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}.aero-source{display:flex;flex-direction:column;background:#fff;border:1px solid var(--aero-line);border-radius:18px;padding:1rem;text-decoration:none;color:var(--aero-ink)}.aero-source:hover,.aero-source:focus{transform:translateY(-2px);box-shadow:0 14px 28px rgba(7,26,51,.08);outline:3px solid rgba(200,162,74,.28)}.aero-source span{color:#617081;font-size:.86rem;margin-top:.35rem}
.aero-print-card{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:1.4rem;align-items:center;background:#fff;border:1px solid var(--aero-line);border-radius:24px;padding:1.35rem;box-shadow:0 16px 35px rgba(7,26,51,.06)}.aero-print-preview{background:#f4f4f4;border:1px solid #ccc;border-radius:12px;aspect-ratio:8.5/11;display:grid;place-items:center;padding:1rem;text-align:center}.aero-print-preview strong{font-size:2rem;letter-spacing:-.04em;color:#111}.aero-print-preview span{font-size:.72rem;color:#333}.aero-ref-disclaimer{font-size:.82rem;color:#5b6877;margin-top:.9rem}
@media(max-width:1050px){.aero-topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.aero-ref-glossary{grid-template-columns:repeat(2,minmax(0,1fr))}.aero-instrument-grid,.aero-source-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:780px){.aero-ref-hero-grid,.aero-panel-grid,.aero-print-card{grid-template-columns:1fr}.aero-ref-stats{grid-template-columns:repeat(4,minmax(120px,1fr));overflow-x:auto}.aero-ref-search-row{grid-template-columns:1fr}.aero-ref-count{white-space:normal}}
@media(max-width:620px){.aero-ref-hero{padding:3.2rem 0 2.8rem}.aero-ref-glossary,.aero-topic-grid,.aero-instrument-grid,.aero-source-grid{grid-template-columns:1fr}.aero-ref-stats{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media print{.site-header,.footer,.back-to-top,.aero-ref-nav,.aero-ref-actions,.aero-ref-search-shell,.course-subnav{display:none!important}.aero-ref-page{background:#fff}.aero-ref-hero{background:#fff!important;color:#000!important;padding:1rem 0}.aero-ref-hero h1,.aero-ref-hero p,.aero-ref-hero .eyebrow{color:#000!important}.aero-ref-section{padding:1rem 0}.aero-topic-card,.aero-panel,.aero-term{box-shadow:none;break-inside:avoid}}