:root{--panel:#0f141b;--panel-2:#161d27;--wire:#2a3542;--trace:#3ddc97;--trace-d:#25b47a;--amber:#f0b429;--text:#dfe6ee;--mute:#90a0b0;--bg:#0b0f14}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16.5px/1.7 "IBM Plex Sans","Segoe UI",Arial,sans-serif}
a{color:var(--trace);text-underline-offset:3px}a:hover{color:var(--amber)}
.board-wrap{max-width:980px;margin:0 auto;padding:0 18px}
.circuit-top{background:var(--panel);border-bottom:1px solid var(--wire)}
.circuit-top .board-wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 22px;padding:16px 18px}
.ictmark{font:700 20px/1 "IBM Plex Mono","Roboto Mono",Menlo,monospace;letter-spacing:.08em;color:var(--trace);text-decoration:none}
.ictmark b{color:var(--amber);font-weight:700}
.chip-nav{display:flex;flex-wrap:wrap;gap:4px 16px;font:500 13.5px/1.6 "IBM Plex Mono","Roboto Mono",Menlo,monospace;letter-spacing:.02em}
.chip-nav a{color:var(--mute);text-decoration:none}.chip-nav a:hover{color:var(--text)}
.signal-intro{padding:52px 0 22px;border-bottom:1px solid var(--wire)}
.signal-intro h1{font:700 clamp(28px,5.2vw,48px)/1.08 "IBM Plex Sans","Segoe UI",Arial,sans-serif;margin:0;max-width:17ch;color:#fff}
.signal-intro p{max-width:54ch;margin:16px 0 0;color:var(--mute);font-size:17.5px}
.board-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;padding:22px 0 72px}
.board-tile{display:block;background:var(--panel-2);border:1px solid var(--wire);border-radius:10px;padding:22px 22px 20px;text-decoration:none;color:var(--text);position:relative}
.board-tile::after{content:"";position:absolute;left:22px;top:0;width:34px;height:3px;background:var(--trace);border-radius:0 0 2px 2px}
.board-tile:hover{border-color:var(--trace-d)}
.packet-tag{font:600 11px/1.6 "IBM Plex Mono","Roboto Mono",Menlo,monospace;letter-spacing:.14em;text-transform:uppercase;color:var(--amber)}
.board-tile h2{font:600 19.5px/1.3 "IBM Plex Sans","Segoe UI",Arial,sans-serif;margin:7px 0 8px;color:#fff}
.board-tile p{margin:0;color:var(--mute);font-size:14.5px;line-height:1.55}
.teardown-sheet{max-width:720px;margin:34px auto 76px;background:var(--panel-2);border:1px solid var(--wire);border-radius:12px;padding:32px 36px}
.teardown-sheet h1{font:700 clamp(25px,4.4vw,38px)/1.12 "IBM Plex Sans","Segoe UI",Arial,sans-serif;color:#fff;margin:8px 0 14px}
.readout-line{font-size:17.5px;color:var(--mute);margin:0 0 26px;padding-bottom:18px;border-bottom:1px solid var(--wire)}
.teardown-sheet h2{font:600 19px/1.3 "IBM Plex Sans","Segoe UI",Arial,sans-serif;color:var(--trace);margin:28px 0 8px}
.teardown-sheet ul,.teardown-sheet ol{padding-left:22px}.teardown-sheet li{margin:6px 0}
.teardown-sheet ul.pinlist{list-style:none;padding-left:0}.teardown-sheet ul.pinlist li{padding-left:24px;position:relative}
.teardown-sheet ul.pinlist li::before{content:">";position:absolute;left:2px;top:0;color:var(--trace);font-family:"IBM Plex Mono",monospace}
.spec-aside{background:#12202b;border:1px solid var(--wire);border-left:3px solid var(--trace);border-radius:6px;padding:12px 16px;font-size:15px;color:var(--text)}
.sign-caveat{background:#231c0f;border:1px solid #4a3a16;border-left:3px solid var(--amber);border-radius:6px;padding:12px 16px;font-size:15px}
.draw-slip{margin-top:26px;background:#12202b;border:1px dashed var(--trace-d);border-radius:6px;padding:12px 16px;font-size:14.5px;color:var(--text)}
.rev-stamp{margin-top:30px;font:600 12px/1.5 "IBM Plex Mono","Roboto Mono",Menlo,monospace;letter-spacing:.08em;text-transform:uppercase;color:var(--amber)}
.rack-foot{background:var(--panel);border-top:1px solid var(--wire);color:var(--mute);font:14px/1.7 "IBM Plex Mono","Roboto Mono",Menlo,monospace}
.rack-foot .board-wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px 22px;padding:22px 18px 28px}
.rack-foot a{color:var(--trace)}
@media(max-width:680px){.board-grid{grid-template-columns:1fr}.teardown-sheet{padding:22px 16px;margin-top:22px}.signal-intro{padding-top:34px}}