:root{
  --bg:#0b0e14; --bg2:#0f131b; --panel:#141a24; --panel2:#1a212d; --fg:#e8eef6;
  --mut:#93a1b5; --dim:#6b7789; --bd:#232c3a; --code:#0d1219;
  --left:#54aaff; --right:#ff7a6a; --acc:#54aaff; --acc2:#3a86e0; --ok:#5fd39a;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);line-height:1.72;font-size:15.5px;
  font-family:-apple-system,'Inter','Segoe UI',Roboto,'Noto Sans SC','Microsoft YaHei',sans-serif;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:var(--acc);text-decoration:none}
a:hover{color:#8cc6ff;text-decoration:underline}

/* sidebar nav */
.sidebar{position:fixed;top:0;left:0;width:250px;height:100vh;overflow-y:auto;
  background:linear-gradient(180deg,#10151e,#0c1017);border-right:1px solid var(--bd);
  padding:22px 14px 30px;z-index:20}
.brand{display:block;font-size:19px;font-weight:800;color:#fff;padding:6px 12px 20px;
  line-height:1.2;letter-spacing:.2px}
.brand:hover{text-decoration:none}
.brand span{display:block;font-size:11px;font-weight:500;color:var(--dim);margin-top:6px;letter-spacing:.3px}
.navlink{display:flex;align-items:center;gap:11px;padding:9px 12px;margin:2px 0;border-radius:9px;
  color:var(--mut);font-size:14px;font-weight:500;border-left:3px solid transparent;transition:.13s}
.navlink:hover{background:var(--panel2);color:#fff;text-decoration:none}
.navlink.active{background:linear-gradient(90deg,rgba(84,170,255,.16),rgba(84,170,255,0));
  border-left-color:var(--acc);color:#fff;font-weight:600}
.navnum{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;
  border-radius:6px;background:#1c2532;color:var(--dim);font-size:11px;font-weight:700;flex:none}
.navlink.active .navnum{background:var(--acc);color:#08111d}
.navlink.gallery{margin-top:10px;border-top:1px solid var(--bd);border-radius:0;padding-top:16px}
.navlink.gallery .navnum{color:var(--acc);background:#16202e}
.navfoot{margin-top:22px;padding:14px 12px 0;border-top:1px solid var(--bd);
  font-size:11px;color:var(--dim);line-height:1.7}
.navfoot code{font-size:10.5px}
.navtoggle,.navburger{display:none}

/* content */
.content{margin-left:250px;max-width:900px;padding:40px 52px 90px}
.eyebrow{font-size:11.5px;font-weight:700;letter-spacing:1.6px;text-transform:uppercase;color:var(--acc)}
.pagehead h1{font-size:31px;line-height:1.22;margin:8px 0 6px;font-weight:800;letter-spacing:-.4px}
.pagehead{padding-bottom:20px;margin-bottom:8px;border-bottom:1px solid var(--bd)}
h1{font-size:27px}
h2{font-size:20px;margin:44px 0 14px;padding-bottom:8px;color:#fff;font-weight:700;
  border-bottom:1px solid var(--bd);letter-spacing:-.2px}
h3{font-size:15.5px;margin:26px 0 8px;color:#cbd6e4;font-weight:650}
p{margin:12px 0}
strong{color:#fff;font-weight:650}
em{color:#c7d3e2}
code{background:var(--code);color:#a9d6ff;padding:2px 6px;border-radius:5px;font-size:.86em;
  font-family:'SF Mono',Menlo,Consolas,monospace;border:1px solid #1b2431}
pre{background:#0a0e14;border:1px solid var(--bd);border-radius:12px;padding:16px 18px;
  overflow-x:auto;margin:18px 0}
pre code{background:none;border:0;color:#aebccb;padding:0;font-size:12.6px;line-height:1.65}

/* blockquotes + callouts */
blockquote{margin:18px 0;padding:14px 18px;background:var(--panel2);
  border-left:4px solid var(--dim);border-radius:0 10px 10px 0;color:#c7d3e2;font-size:.96em}
blockquote.takeaway{background:linear-gradient(90deg,rgba(95,211,154,.10),rgba(95,211,154,.02));
  border-left-color:var(--ok);color:#dbe8e0}
blockquote.takeaway strong{color:#8ef0bf}
blockquote.note{background:linear-gradient(90deg,rgba(84,170,255,.10),rgba(84,170,255,.02));
  border-left-color:var(--acc)}

/* tables */
.tablewrap{overflow-x:auto;margin:18px 0;border-radius:12px;box-shadow:0 0 0 1px var(--bd)}
table{border-collapse:collapse;width:100%;font-size:13.4px;min-width:420px}
th,td{padding:10px 13px;text-align:left;border-bottom:1px solid var(--bd)}
th{background:#19222f;color:#fff;font-weight:650;white-space:nowrap}
td{color:#d3dde9}
tr:last-child td{border-bottom:0}
tbody tr:nth-child(even) td{background:#12171f}
tbody tr:hover td{background:#17202b}
hr{border:0;border-top:1px solid var(--bd);margin:34px 0}
ul,ol{margin:12px 0;padding-left:24px} li{margin:6px 0}

/* media */
figure{margin:26px 0;text-align:center}
img,video{max-width:100%;height:auto;border:1px solid var(--bd);border-radius:14px;
  box-shadow:0 8px 30px rgba(0,0,0,.4);background:#000}
video{width:100%}
figcaption{color:var(--mut);font-size:12.6px;margin-top:10px;line-height:1.55;max-width:820px;
  margin-left:auto;margin-right:auto;text-align:left}
.imgmiss{color:#ff8a80;font-size:13px;padding:9px 13px;background:#241417;
  border:1px solid #4a2429;border-radius:9px;margin:16px 0}

/* in-page tabs (index: Overview | Model Gallery) */
.tabbar{display:flex;gap:4px;margin:24px 0 6px;border-bottom:1px solid var(--bd)}
.tab{appearance:none;background:none;border:0;border-bottom:2px solid transparent;color:var(--mut);
  font:inherit;font-weight:650;font-size:14.5px;padding:11px 18px;cursor:pointer;border-radius:9px 9px 0 0;
  transition:.13s}
.tab:hover{color:#fff;background:var(--panel2)}
.tab.active{color:#fff;border-bottom-color:var(--acc)}
.tabpanel{display:none}
.tabpanel.active{display:block;animation:tabfade .22s ease}
@keyframes tabfade{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.galleryhint{color:var(--mut);font-size:13.5px;margin:16px 0 14px;max-width:820px}
.galleryframe{width:100%;min-height:1200px;border:1px solid var(--bd);border-radius:14px;
  background:var(--bg);display:block}

/* hero (index) */
.hero{margin:22px 0 6px}
.pillrow{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:20px}
.hpill{background:var(--panel);border:1px solid var(--bd);border-radius:22px;padding:7px 15px;
  font-size:12.5px;color:var(--mut)}
.hpill b{color:var(--acc);font-weight:700}
.lede{font-size:17px;line-height:1.65;color:#d7e1ee;max-width:760px}
.lede b{color:#fff}

/* index cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:15px;margin:18px 0}
.card{display:block;position:relative;padding:18px 20px;background:var(--panel);border:1px solid var(--bd);
  border-radius:14px;transition:.15s;overflow:hidden}
.card:hover{border-color:var(--acc);transform:translateY(-3px);text-decoration:none;
  box-shadow:0 10px 30px rgba(0,0,0,.35)}
.cardnum{font-size:12px;font-weight:800;color:var(--acc);letter-spacing:1px;margin-bottom:8px}
.cardtitle{font-size:16px;font-weight:700;color:#fff;margin-bottom:7px}
.carddesc{font-size:12.6px;color:var(--mut);line-height:1.55}

/* footer + legend */
.sitefoot{margin-top:60px;padding-top:20px;border-top:1px solid var(--bd);
  color:var(--dim);font-size:12px}
.lg{font-weight:700} .lg.l{color:var(--left)} .lg.r{color:var(--right)}
.sitefoot code{font-size:11px}

/* responsive */
@media (max-width:900px){
  .sidebar{position:static;width:auto;height:auto;border-right:0;border-bottom:1px solid var(--bd);
    display:none;background:#0f141d}
  .navtoggle:checked ~ .sidebar{display:block}
  .navburger{display:flex;align-items:center;position:sticky;top:0;z-index:30;cursor:pointer;
    background:#0f141d;color:#fff;padding:14px 18px;font-size:15px;font-weight:600;
    border-bottom:1px solid var(--bd)}
  .content{margin-left:0;padding:24px 18px 70px;max-width:100%}
  .pagehead h1{font-size:25px}
  figcaption{text-align:left}
}