/* Air Systems — section 2. Duct/sky #0811C4. Bored Aviator Normal teaching. Not QRH.
   ELEC GOLD CHROME LOCK: cond/obj = elec6 (pad 16/18, lbl 14px #E10600, txt 19px);
   card = #0c0c0c / 18px body; chapter-bar D-DIN + --sec2 duct blue
   (NOT Extra #3ecbff, NOT Elec violet #0E0152, NOT Normal teal #00e8c0 as chapter bar). */
:root{--sec2:#0811C4;--sec2-fg:#ffffff;--sec2-dim:#010327;--sec2-wash:#d4d8ff;--amber:#ffb020;--blue-lt:#3aa0ff;}

.sec2-chapter-bar{
  display:flex;align-items:center;justify-content:flex-end;gap:8px;
  background:var(--sec2);color:var(--sec2-fg);
  font-family:"D-DIN","Arial Narrow",Arial,sans-serif;
  font-weight:800;letter-spacing:.12em;text-transform:uppercase;
  font-size:15px;padding:10px 16px;margin:0;
}
.sec2-chapter-bar .sec2-duct{
  width:20px;height:20px;flex-shrink:0;position:relative;
  border:2px solid var(--sec2-fg);border-radius:50%;
}
.sec2-chapter-bar .sec2-duct:before{
  content:"";position:absolute;left:3px;right:3px;top:50%;height:2px;
  background:var(--sec2-fg);transform:translateY(-50%);
}
.sec2-chapter-bar .sec2-duct:after{
  content:"";position:absolute;left:50%;top:3px;bottom:3px;width:2px;
  background:var(--sec2-fg);transform:translateX(-50%);
}

.chapter-toc{display:flex;flex-direction:column;gap:8px;margin:8px 0 18px;}
.chapter-toc a{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  background:linear-gradient(180deg,#161616 0%,#0e0e0e 100%);
  border:1px solid #2a2a2a;border-left:4px solid var(--sec2);
  border-radius:14px;padding:14px 14px;color:#fff;text-decoration:none;
  font-size:17px;font-weight:700;min-height:56px;
}
.chapter-toc a .pg{color:#8e8e93;font-size:12px;font-weight:800;flex-shrink:0;}
.chapter-toc a.crit{border-left-color:#E10600;background:#1a1010;}
.chapter-toc a.form{
  border-left-color:#ffb020;
  background:linear-gradient(180deg,#1a160c 0%,#100e08 100%);
}
.sec2-ico-book{
  width:28px;height:22px;flex-shrink:0;position:relative;
  border:2px solid #ffb020;border-radius:2px 8px 8px 2px;margin-right:4px;
}
.sec2-ico-book:before{
  content:"";position:absolute;left:8px;top:3px;bottom:3px;width:2px;background:#ffb020;
}

.sec2-pill{
  display:inline-block;font-size:13px;font-weight:800;letter-spacing:.08em;
  text-transform:uppercase;padding:6px 12px;border-radius:999px;margin:0 6px 8px 0;
}
.sec2-pill.gnd{background:#3d2a00;color:#ffb020;border:1px solid #ffb020;}
.sec2-pill.flt{background:#0a2540;color:#3aa0ff;border:1px solid #3aa0ff;}
.sec2-pill.nnc{background:var(--sec2-wash);color:var(--sec2);border:1px solid var(--sec2);}
.sec2-pill.sys{background:var(--sec2-wash);color:var(--sec2);border:1px solid var(--sec2);}
.sec2-pill.asinst{background:#1a1030;color:#ce93d8;border:1px solid #ce93d8;}
.sec2-pill.to{background:#0a2030;color:#7EC8FF;border:1px solid #3aa0ff;}

/* Electrical-style hub TOC alias */
.sec2-toc{display:flex;flex-direction:column;gap:8px;margin:8px 0 18px;}
.sec2-toc a{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  background:linear-gradient(180deg,#161616 0%,#0e0e0e 100%);
  border:1px solid #2a2a2a;border-left:4px solid var(--sec2);
  border-radius:14px;padding:14px 14px;color:#fff;text-decoration:none;
  font-size:17px;font-weight:700;min-height:56px;
}
.sec2-toc a .pg{color:#8e8e93;font-size:12px;font-weight:800;flex-shrink:0;}
.sec2-toc a.form,.chapter-toc a.form{
  border-left-color:#ffb020;
  background:linear-gradient(180deg,#1a160c 0%,#100e08 100%);
}
.sec2-toc a.crit,.chapter-toc a.crit{border-left-color:#E10600;background:#1a1010;}
.sec2-toc .toc-grp,.chapter-toc .toc-grp{
  font-size:11px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;
  color:var(--sec2);padding:12px 4px 4px;margin:6px 0 2px;
  border-bottom:1px solid rgba(8,17,196,.35);
}

.sec2-cond,.sec2-obj{
  background:#000;border:1px solid #2a2a2a;border-radius:14px;padding:16px 18px;margin:12px 0;
}
.sec2-cond .lbl,.sec2-obj .lbl{
  color:#E10600;font-size:14px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;margin-bottom:8px;
}
.sec2-cond .txt,.sec2-obj .txt{color:#fff;font-size:19px;line-height:1.45;}

.sec2-warn{
  background:#1a0808;border:1.5px solid #E10600;border-radius:12px;
  padding:16px 18px;margin:12px 0;color:#ffffff;font-size:18px;line-height:1.45;
}
.sec2-note{
  background:#111;border-left:3px solid var(--sec2);border-radius:10px;
  padding:14px 16px;margin:12px 0;color:#ddd;font-size:18px;line-height:1.5;
}
.sec2-amber{
  background:#1a1408;border:1.5px solid #ffb020;border-radius:12px;
  padding:16px 18px;margin:12px 0;color:#ffe0a0;font-size:18px;line-height:1.45;
}

.sec2-light{
  display:inline-block;border:1.5px solid #ffb020;color:#ffb020;background:#120e00;
  font-size:15px;font-weight:800;letter-spacing:.04em;padding:8px 12px;border-radius:8px;
  margin:3px 4px 3px 0;text-align:center;
}
.sec2-light.blue{border-color:#3aa0ff;color:#3aa0ff;background:#061018;}
.sec2-light.red{border-color:#E10600;color:#ff8a80;background:#180808;}
.sec2-light.grn{border-color:#66bb6a;color:#a5d6a7;background:#0a180c;}
.sec2-light.wht{border-color:#eceff1;color:#eceff1;background:#1a1a1a;}
.sec2-lights{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 14px;}

.sec2-and,.sec2-or{
  background:#121212;border:1px solid #2a2a2a;border-radius:14px;padding:14px;margin:12px 0;
}
.sec2-and .gate,.sec2-or .gate{
  font-size:22px;font-weight:800;letter-spacing:.06em;color:var(--sec2);margin-bottom:10px;
  background:var(--sec2-wash);display:inline-block;padding:8px 12px;border-radius:10px;
}
.sec2-and ul,.sec2-or ul{margin:0;padding-left:22px;color:#eee;font-size:18px;line-height:1.5;}
.sec2-out{margin-top:10px;text-align:right;}

.sec2-h{
  font-size:22px;font-weight:800;letter-spacing:.04em;color:#fff;
  border-bottom:2px solid var(--sec2);padding-bottom:6px;margin:20px 0 12px;
}
.sec2-card{
  background:#0c0c0c;border:1px solid #222;border-radius:14px;padding:14px 16px;margin:10px 0;
  color:#ddd;font-size:18px;line-height:1.5;
}
.sec2-card h3{color:#fff;font-size:19px;margin:0 0 8px;}
.sec2-card ul{margin:6px 0 0;padding-left:18px;}
.sec2-card p{margin:0 0 8px;}
.sec2-card p:last-child{margin:0;}
.sec2-card strong{color:#fff;}
.sec2-card .b{color:var(--sec2);font-weight:800;}
.sec2-card .a{color:#ffb020;font-weight:800;}

.sec2-bus{
  display:inline-flex;align-items:center;gap:6px;background:#0d1a28;border:1px solid #1a3a55;
  color:#7EC8FF;font-size:15px;font-weight:700;padding:8px 12px;border-radius:8px;margin:3px 4px 3px 0;
}
.sec2-bus:before{content:"";width:8px;height:8px;border-radius:50%;background:#3aa0ff;box-shadow:0 0 8px #3aa0ff;}

.sec2-tbl{width:100%;border-collapse:collapse;font-size:16px;margin:8px 0 4px;}
.sec2-tbl th{text-align:left;color:var(--sec2);background:var(--sec2-wash);font-size:13px;letter-spacing:.08em;text-transform:uppercase;padding:8px 8px;border-bottom:1px solid #333;}
.sec2-tbl td{padding:7px 8px;border-bottom:1px solid #1e1e1e;color:#eee;vertical-align:top;}
.sec2-tbl tr:nth-child(even) td{background:#0e0e0e;}

.sec2-step{
  background:#141414;border:1px solid #2a2a2a;border-radius:12px;padding:12px 14px;margin:8px 0;
  color:#eee;font-size:18px;line-height:1.45;
}
.sec2-step strong{color:#ffb020;}

.sec2-form-topic{
  background:#0c0c0c;border:1px solid #222;border-radius:14px;padding:16px;margin:0 0 12px;
}
.sec2-form-topic h2{
  color:var(--sec2);font-size:20px;letter-spacing:.05em;text-transform:uppercase;
  margin:0 0 12px;font-weight:800;
  background:var(--sec2-wash);display:inline-block;padding:6px 10px;border-radius:8px;
}
.sec2-form-topic .tip{
  background:#101010;border-left:3px solid #ffb020;border-radius:8px;
  padding:12px 14px;margin:8px 0;color:#ddd;font-size:18px;line-height:1.5;
}
.sec2-form-topic .tip p{margin:0 0 6px;}
.sec2-form-topic .tip p:last-child{margin:0;}

.sec2-link{color:var(--sec2);font-weight:700;text-decoration:none;background:var(--sec2-wash);padding:2px 8px;border-radius:6px;}
.sec2-compound{
  display:flex;align-items:center;gap:10px;margin:18px 0 10px;
  color:#ffb020;font-weight:800;letter-spacing:.08em;text-transform:uppercase;font-size:14px;
}
.sec2-compound:before,.sec2-compound:after{
  content:"";flex:1;height:1px;background:#ffb020;opacity:.45;
}

a.mel-go{
  display:inline-block;vertical-align:middle;
  background:#1a0000;border:1.5px solid #E10600;color:#fff;
  font-family:"D-DIN","Arial Narrow",Arial,sans-serif;
  font-weight:800;font-size:16px;letter-spacing:.04em;
  padding:10px 14px;border-radius:10px;text-decoration:none;
  white-space:nowrap;line-height:1.15;margin:2px 2px;min-height:44px;box-sizing:border-box;
}
a.mel-go:active{filter:brightness(1.2);}

.sec2-cb{
  display:inline-flex;align-items:center;gap:6px;
  background:#1a0808;border:1.5px solid #E10600;color:#fff;
  font-weight:800;font-size:15px;letter-spacing:.04em;
  padding:6px 10px;border-radius:8px;white-space:nowrap;
}
.sec2-cb:before{
  content:"";width:10px;height:10px;border-radius:50%;
  background:#E10600;box-shadow:0 0 8px #E10600;flex-shrink:0;
}

.page-header h1, h1{font-size:26px !important;line-height:1.2 !important;}
.back-link{font-size:16px;}

/* Bigger type in NNC rectangles — mirror sec1-nnc */
.sec2-nnc .box-cond .txt,
.sec2-nnc .box-obj .txt{font-size:18px !important;line-height:1.45 !important;color:#fff !important;}
.sec2-nnc .step-card{font-size:18px !important;line-height:1.45 !important;padding:16px 16px !important;}
.sec2-nnc .choice-btn{font-size:16px !important;min-height:96px !important;}
.sec2-nnc .choice-row.stack{flex-direction:row;}
.sec2-nnc .choice-row.stack .choice-btn{min-width:0;}
.sec2-nnc .warn{
  background:#1a0808;border:1.5px solid #E10600;border-radius:12px;
  padding:14px 16px;margin:12px 0;color:#ffffff;font-size:16px;line-height:1.45;
}
.sec2-nnc .warn .lbl{
  color:#E10600;font-size:12px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;margin-bottom:8px;
}
.sec2-nnc .caution{
  background:#1a1408;border:1.5px solid #c9a227;border-radius:12px;
  padding:14px 16px;margin:12px 0;color:#ffe0a0;font-size:16px;line-height:1.45;
}
.sec2-nnc .caution .lbl{
  color:#c9a227;font-size:12px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;margin-bottom:8px;
}
.sec2-nnc .note{
  background:#111;border-left:3px solid var(--sec2);border-radius:10px;
  padding:12px 14px;margin:12px 0;color:#ddd;font-size:15px;line-height:1.5;
}
.cl.form{border-left:3px solid #ffb020;padding-left:10px;}

.sec2-svg-wrap{background:#0a0a0a;border:1px solid #222;border-radius:14px;padding:12px;margin:12px 0;overflow-x:auto;}
.sec2-svg-wrap svg{display:block;max-width:100%;height:auto;margin:0 auto;}

/* Figures / captions — Bored Aviator dark + Tesla-red accent */
.sec2-fig{
  background:#0a0a0a;border:1px solid #222;border-left:3px solid #E10600;
  border-radius:14px;padding:14px 14px 10px;margin:14px 0;overflow-x:auto;
}
.sec2-fig svg{display:block;max-width:100%;height:auto;margin:0 auto;}
.sec2-fig-cap{
  color:#f0f0f5;font-size:15px;line-height:1.4;margin:10px 0 0;
  text-align:center;letter-spacing:.02em;
}
.sec2-flow{
  display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:center;
  margin:10px 0;
}
.sec2-flow .node{
  background:#141414;border:1px solid #333;color:#fff;font-size:15px;font-weight:700;
  padding:10px 12px;border-radius:10px;text-align:center;min-width:72px;
}
.sec2-flow .node.hot{border-color:#E10600;color:#ff8a80;}
.sec2-flow .node.cold{border-color:#3aa0ff;color:#7EC8FF;}
.sec2-flow .node.amb{border-color:#ffb020;color:#ffe0a0;}
.sec2-flow .arr{color:#E10600;font-weight:800;font-size:18px;}
.sec2-rot{
  background:linear-gradient(180deg,#1a1208 0%,#100c06 100%);
  border:1px solid #5a3a10;border-radius:12px;padding:14px 16px;margin:12px 0;
  color:#ffe0a0;font-size:18px;line-height:1.5;
}
.sec2-rot .lbl{
  display:inline-block;background:#ffb020;color:#000;font-size:12px;font-weight:800;
  letter-spacing:.1em;text-transform:uppercase;padding:4px 10px;border-radius:999px;margin-bottom:8px;
}


.sec2-reveal{margin:8px 0 18px;}
.sec2-reveal-btn{
  appearance:none;-webkit-appearance:none;width:100%;box-sizing:border-box;
  min-height:48px;padding:12px 16px;border-radius:12px;cursor:pointer;
  background:#0c0c0c;border:1px solid #2a2a2a;color:#c8c8d0;
  font-family:inherit;font-size:14px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
}
.sec2-reveal-btn:active{opacity:.85;}
.sec2-reveal-btn[aria-expanded="true"]{
  border-color:var(--sec2);color:#d4d8ff;background:#060a28;
}
.sec2-reveal-panel{margin-top:12px;}

.actions-grid a.action-btn.live-chip{
  background:linear-gradient(160deg,#060a28 0%,#0a1450 55%,#04061a 100%)!important;
  border:1.5px solid #6a7cff!important;
  color:#e8ecff!important;
  box-shadow:0 0 14px rgba(8,17,196,.35), inset 0 1px 0 rgba(255,255,255,.06);
  min-height:72px;
}
.actions-grid a.action-btn.live-chip .emoji{color:#8a96ff;filter:none;}
.actions-grid a.action-btn.live-chip .live-chip-sub{
  display:block;font-size:10px;letter-spacing:.14em;color:#8a96ff;opacity:.9;margin-top:4px;font-weight:700;
}