@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@500;600&display=swap');
:root{--ink:#edf7f5;--muted:#9bb1ac;--night:#071310;--panel:#0d211d;--panel2:#132d27;--line:#23463d;--mint:#9df3d5;--amber:#ffcb66;--coral:#ff735d;--paper:#f2eadc;--paper-ink:#17231f;--max:1180px;--radius:18px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--night);color:var(--ink);font:16px/1.65 'DM Sans',system-ui,sans-serif}a{color:inherit}img{max-width:100%;height:auto}.skip{position:absolute;left:-999px}.skip:focus{left:1rem;top:1rem;background:#fff;color:#000;padding:.6rem;z-index:99}.wrap{width:min(var(--max),calc(100% - 2rem));margin:auto}.topbar{border-bottom:1px solid var(--line);background:#06100e;position:sticky;top:0;z-index:20}.nav{min-height:74px;display:flex;align-items:center;gap:2rem}.brand{display:flex;align-items:center;gap:.8rem;text-decoration:none;font-weight:700;letter-spacing:-.03em}.brand-mark{width:42px;height:42px;border:1px solid var(--mint);border-radius:50%;display:grid;place-items:center;color:var(--mint);font:600 .8rem 'IBM Plex Mono'}.navlinks{display:flex;gap:1.4rem;margin-left:auto}.navlinks a,.menu-button{text-decoration:none;color:var(--muted);font-weight:600}.navlinks a:hover{color:var(--mint)}.menu-button{display:none;background:none;border:1px solid var(--line);padding:.5rem .7rem;border-radius:8px}.hero{padding:5.5rem 0 4rem;overflow:hidden;background:radial-gradient(circle at 85% 20%,#174d3f 0,transparent 32%),linear-gradient(150deg,#071310 45%,#0b211b)}.eyebrow,.kicker{font:600 .75rem 'IBM Plex Mono';letter-spacing:.16em;text-transform:uppercase;color:var(--mint)}h1,h2,h3{line-height:1.08;letter-spacing:-.045em}h1{font-size:clamp(3rem,7vw,6.6rem);max-width:900px;margin:.3rem 0 1.4rem}h2{font-size:clamp(2rem,4vw,3.4rem)}h3{font-size:1.45rem}.lede{font-size:clamp(1.05rem,2vw,1.35rem);color:#bfd0cc;max-width:720px}.actions{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:2rem}.button{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;text-decoration:none;padding:.85rem 1.15rem;border-radius:10px;background:var(--mint);color:#062019;font-weight:700;border:1px solid var(--mint)}.button.secondary{background:transparent;color:var(--ink);border-color:var(--line)}.board{margin-top:4rem;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#06100e;box-shadow:0 25px 70px #0008}.board-head,.board-row{display:grid;grid-template-columns:110px 1.5fr 1fr 120px;gap:1rem;align-items:center;padding:.9rem 1.2rem}.board-head{font:600 .68rem 'IBM Plex Mono';letter-spacing:.14em;color:#68827b;text-transform:uppercase}.board-row{border-top:1px solid #172c27;font:500 .95rem 'IBM Plex Mono'}.board-row strong{color:var(--amber);letter-spacing:.08em}.status{color:var(--mint)}.section{padding:5rem 0}.section.paper{background:var(--paper);color:var(--paper-ink)}.section-head{display:flex;align-items:end;justify-content:space-between;gap:2rem;margin-bottom:2rem}.section-head h2{margin:0}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.35rem;text-decoration:none;transition:.2s transform,.2s border-color}.card:hover{transform:translateY(-3px);border-color:var(--mint)}.card p{color:var(--muted)}.paper .card{background:#fff;border-color:#d9cfbd}.paper .card p{color:#55605b}.code{font:600 .76rem 'IBM Plex Mono';color:var(--amber);letter-spacing:.12em}.toolbox{display:grid;grid-template-columns:1.2fr .8fr;gap:1.2rem}.tool{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem}.tool label{display:block;color:var(--muted);font-size:.88rem;margin:.9rem 0 .3rem}.tool input,.tool select{width:100%;padding:.85rem;background:#071310;color:var(--ink);border:1px solid var(--line);border-radius:8px;font:inherit}.result{margin-top:1rem;padding:1rem;background:#071310;border-radius:10px;color:var(--mint);min-height:56px}.article-shell{display:grid;grid-template-columns:minmax(0,760px) 280px;gap:3rem;padding:4rem 0}.prose{font-size:1.05rem}.prose h1{font-size:clamp(2.6rem,6vw,5rem)}.prose h2{font-size:2rem;margin-top:2.6rem}.prose h3{margin-top:2rem}.prose a{color:#72dfbd}.prose table{width:100%;border-collapse:collapse;display:block;overflow:auto}.prose td,.prose th{border:1px solid var(--line);padding:.6rem}.prose blockquote{border-left:3px solid var(--mint);margin-left:0;padding-left:1.2rem;color:var(--muted)}.prose img{border-radius:12px}.meta{color:var(--muted);font:500 .8rem 'IBM Plex Mono'}.aside{position:sticky;top:100px;align-self:start}.disclosure{font-size:.78rem;color:var(--muted);border-top:1px solid var(--line);padding-top:1rem}.chips{display:flex;gap:.5rem;flex-wrap:wrap}.chip{font:500 .73rem 'IBM Plex Mono';border:1px solid var(--line);border-radius:999px;padding:.35rem .6rem;text-decoration:none}.footer{padding:3rem 0;border-top:1px solid var(--line);color:var(--muted)}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:2rem}.social{display:flex;gap:1rem}.archive-list{display:grid;gap:1rem}.archive-item{padding:1.2rem;border:1px solid var(--line);border-radius:12px;text-decoration:none}.archive-item h3{margin:.2rem 0}.search{max-width:540px;position:relative}.search input{width:100%;padding:1rem 1.1rem;background:#071310;color:white;border:1px solid var(--line);border-radius:12px}.search-results{position:absolute;top:calc(100% + .4rem);width:100%;background:#0d211d;border:1px solid var(--line);border-radius:12px;overflow:hidden;z-index:10}.search-results a{display:block;padding:.7rem 1rem;text-decoration:none;border-bottom:1px solid var(--line)}
@media(max-width:800px){.navlinks{display:none;position:absolute;top:74px;left:0;right:0;background:#071310;padding:1rem;flex-direction:column}.navlinks.open{display:flex}.menu-button{display:block;margin-left:auto}.grid{grid-template-columns:1fr}.toolbox,.article-shell{grid-template-columns:1fr}.board-head,.board-row{grid-template-columns:64px 1fr 90px}.board-head span:nth-child(3),.board-row span:nth-child(3){display:none}.aside{position:static}.footer-grid{grid-template-columns:1fr}.hero{padding-top:3.5rem}}

/* Shared inner-page system: operations header, paper reading panels, topic cards. */
:focus-visible{outline:3px solid var(--amber);outline-offset:4px}
[id]{scroll-margin-top:100px}
.article-hero{padding:2.5rem 0 3rem}
.article-hero h1{font-size:clamp(2.35rem,5.3vw,4.75rem);max-width:1000px;overflow-wrap:anywhere}
.breadcrumbs{display:flex;flex-wrap:wrap;gap:.7rem;align-items:center;margin-bottom:2.4rem;color:var(--muted);font-size:.85rem}
.breadcrumbs a{text-decoration:none}.breadcrumbs a:hover{color:var(--mint)}
.article-hero .eyebrow{display:flex;align-items:center;gap:.8rem}
.airline-code{display:inline-block;background:#050e0b;border:1px solid var(--line);border-radius:8px;padding:.55rem .8rem;font:600 1.4rem 'IBM Plex Mono';color:var(--amber);letter-spacing:.16em}
.at-a-glance{margin-top:2rem;border-top:1px solid var(--line);padding-top:1rem}
.glance-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:.8rem}
.glance-item{background:#071510;border:1px solid var(--line);border-radius:12px;padding:1.15rem;min-width:0}
.glance-item h2{margin:0;color:var(--mint);font:500 .78rem/1.5 'IBM Plex Mono';letter-spacing:.02em}
.glance-item p{font-size:.9rem;color:#c3d4cd;margin:.7rem 0 0}
.glance-item a{display:inline-block;font-size:.8rem;color:var(--mint);margin-top:.5rem}
.article-layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:2rem;padding-top:2.5rem}
.article-rail{align-self:start;position:sticky;top:100px;max-height:calc(100vh - 120px);overflow:auto;padding:0 .4rem .5rem 0}
.section-nav{border:1px solid var(--line);border-radius:var(--radius);padding:1rem;background:var(--panel)}
.section-nav .eyebrow{margin:.3rem 0 1rem;letter-spacing:.1em}
.section-nav a{display:block;padding:.5rem 0;border-top:1px solid var(--line);font-size:.85rem;line-height:1.45;text-decoration:none;color:#bfd0cc}
.section-nav a:hover{color:var(--mint)}
.rail-tool{display:grid;gap:.6rem;margin-top:1rem;padding:1rem;border:1px solid var(--line);border-radius:12px;text-decoration:none}
.rail-tool strong{font-size:.95rem}
.reading-column{min-width:0}
.reading-panel{background:var(--paper);color:var(--paper-ink);border-radius:var(--radius);padding:clamp(1.25rem,3vw,2.8rem);overflow-wrap:anywhere}
.reading-panel h2{font-size:clamp(1.5rem,2.5vw,2rem);letter-spacing:-.035em;line-height:1.2;margin:0 0 1.2rem}
.reading-panel h3{font-size:1.3rem;line-height:1.3}
.reading-panel p{margin:0 0 1.25rem}
.reading-panel a{color:#135d47;text-decoration-thickness:1px;text-underline-offset:3px}
.reading-panel a:hover{color:#072d21}
.reading-panel ul,.reading-panel ol{padding-left:1.4rem}
.reading-panel li{margin:.55rem 0;padding-left:.2rem}
.reading-panel li::marker{color:#40715b}
.reading-panel li>ul,.reading-panel li>ol{margin:.5rem 0 1rem;border-left:1px solid #cfc7b7}
.reading-panel strong{font-weight:700}
.reading-panel .article-intro{font-size:1.16rem;line-height:1.8;color:#314d42}
.briefing-section{padding-top:2rem;margin-top:2rem;border-top:1px solid #d4ccbd}
.briefing-section:first-child{margin-top:0;padding-top:0;border-top:0}
.briefing-section>:last-child{margin-bottom:0}
.section-flight-status{background:#e0e9de;border:1px solid #bdcebd;border-radius:12px;padding:1.2rem!important}
.section-flight-status a{font-weight:700}
.section-advisory,.section-policy{border-left:3px solid #ae751c;padding-left:1.2rem}
.section-tiers>ul{list-style:none;padding-left:0;display:grid;gap:.65rem}
.section-tiers>ul>li{border:1px solid #cfc7b7;border-radius:10px;padding:1rem;background:#faf6ee;margin:0}
.section-tiers>ul>li>strong{color:#285441}
.reading-panel .notice{display:block;border:1px solid #cfc7b7;border-left:3px solid #417e64;border-radius:8px;background:#e4eadd;padding:1rem;margin:1.5rem 0;color:#243b30}
.reading-panel .notice-warning{background:#f8e6c2;border-left-color:#a16a10}
.reading-panel .source-link{overflow-wrap:anywhere;font-size:.94em}
.accuracy-notice{background:#19271f;border:1px solid #605237;border-radius:12px;padding:1.2rem;margin-bottom:1.2rem}
.accuracy-notice p{font-size:.9rem;color:#d7d8c7;margin:.5rem 0 0}
.sources-panel{background:var(--panel);border:1px solid var(--line);padding:1.5rem;border-radius:var(--radius);margin-top:1.2rem}
.sources-panel h2{font-size:1.65rem}.sources-panel ul{padding-left:1.2rem}
.sources-panel a{color:var(--mint);overflow-wrap:anywhere}
.sources-panel li{margin:.6rem 0}
.review-notice{font:400 .75rem/1.7 'IBM Plex Mono';color:var(--muted);margin:1.25rem .3rem}
.affiliate-panel{background:var(--panel2);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem;margin-top:2rem}
.affiliate-panel h2{font-size:1.7rem}.affiliate-panel p{color:#bfd0cc}
.related-guides{padding-top:3rem}.related-guides h2{font-size:2.3rem}.related-guides .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.related-guides h3{font-size:1.25rem;line-height:1.3}
.archive-grid{align-items:stretch}.archive-grid .card{display:flex;flex-direction:column}
.archive-grid h2{font-size:1.5rem;line-height:1.25}
.read-guide{margin-top:auto;color:var(--mint);font-size:.9rem}
.empty-state{grid-column:1/-1;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:2rem}
.empty-state h2{font-size:2rem}
.table-scroll{width:100%;overflow-x:auto;overscroll-behavior-x:contain;border:1px solid #b9b5a6;border-radius:10px;margin:1.5rem 0;background:#fcf8f0}
.prose .table-scroll table{display:table;overflow:visible;border:0;width:100%;min-width:560px;font-size:.9rem;line-height:1.5}
.prose .comparison-table th,.prose .comparison-table td{border:0;border-bottom:1px solid #d4ccbd;padding:.85rem;text-align:left;vertical-align:top}
.prose .comparison-table th{background:#183c30;color:#f3f4e8}
.prose .comparison-table tbody tr:nth-child(even){background:#e8e4d7}
.prose .comparison-table caption{padding:1rem;font-weight:700;text-align:left}
.reading-panel figure{margin:1.5rem 0}.reading-panel figcaption{font-size:.85rem;color:#546257}
.reading-panel img{display:block;max-width:100%;height:auto;object-fit:contain}
.reading-panel iframe{max-width:100%;border:0}
.anchor-target{display:block}
.paper .kicker{color:#24654d}.paper .code{color:#785113}
@media(max-width:1000px){.article-layout{grid-template-columns:210px minmax(0,1fr);gap:1.2rem}}
@media(max-width:800px){
  .article-layout{display:block;padding-top:1.2rem}
  .article-rail{position:static;max-height:none;overflow:visible;padding:0;margin-bottom:1.2rem}
  .section-nav{display:flex;flex-wrap:wrap;gap:.5rem;padding:1rem}
  .section-nav .eyebrow{flex-basis:100%;margin:0 0 .4rem}
  .section-nav a{border:1px solid var(--line);border-radius:7px;padding:.45rem .6rem;font-size:.78rem}
  .rail-tool{display:none}
  .article-hero{padding:2rem 0}.breadcrumbs{margin-bottom:1.7rem}
  .glance-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .glance-item{padding:.85rem}.glance-item p{font-size:.84rem}
  .reading-panel{font-size:1rem}
  .related-guides .grid{grid-template-columns:1fr}
}
@media(max-width:380px){.glance-grid{grid-template-columns:1fr}.brand{font-size:.9rem}.nav{gap:.5rem}.board-head,.board-row{gap:.5rem;padding:.8rem}.board-row{font-size:.8rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.card{transition:none}}


.section-directory{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
.section-directory summary{cursor:pointer;padding:1rem;color:var(--mint);font:500 .8rem 'IBM Plex Mono'}
.section-directory .section-nav{border:0;padding-top:0;background:transparent}
.directory-search{padding:1.2rem;background:var(--panel);border:1px solid var(--line);border-radius:12px;margin-bottom:1rem}
.directory-search label{display:block;font:500 .8rem 'IBM Plex Mono';color:var(--mint);margin-bottom:.7rem}
.directory-search input{width:100%;padding:.9rem;background:var(--night);border:1px solid var(--line);border-radius:8px;font:inherit;color:var(--ink)}
.directory-search p{margin:.5rem 0 0;font-size:.85rem;color:var(--muted)}
.reading-panel .directory-list{list-style:none;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.8rem}
.reading-panel .directory-list li{margin:0;padding:0;min-width:0}
.reading-panel .directory-link{display:flex;align-items:center;height:100%;padding:1.2rem;border:1px solid #cfc7b7;border-radius:12px;background:#faf7f0;text-decoration:none;font-weight:700}
.reading-panel .directory-link:hover{border-color:#417e64;background:#e4eadd}
.reading-panel .feature-list{list-style:none;counter-reset:essentials;padding:0}
.reading-panel .feature-list>li{counter-increment:essentials;padding:1.25rem;margin:1rem 0;border:1px solid #cfc7b7;border-radius:12px;background:#faf7f0}
.reading-panel .feature-list>li::before{content:counter(essentials,decimal-leading-zero);display:block;color:#735018;font:600 .9rem 'IBM Plex Mono';margin-bottom:.5rem}
.reading-panel .feature-list>li>strong:first-child{font-size:1.2rem}
.reading-panel .empty-state{background:#e4eadd;color:var(--paper-ink)}
[hidden]{display:none!important}
@media(max-width:600px){.reading-panel .directory-list{grid-template-columns:1fr}}