/* shell.css — the site frame for the revamp (docs/SITE_MAP.md §10): a slim top bar, the left rail with
   expandable groups, and the scrolling canvas. Loads AFTER style-v4.css and only adds; the tokens, cards,
   grids and every panel style stay in style-v4*.css. Phone (< 900px): the rail is a drawer behind the
   menu button; a bottom tab row carries the four groups a thumb reaches. */

.shell{flex:1;display:flex;min-height:0}
.rail{width:236px;flex:none;display:flex;flex-direction:column;background:linear-gradient(180deg,#0b0d13,#090a10);border-right:1px solid var(--line);overflow-y:auto;padding:12px 10px 16px}
.rail::-webkit-scrollbar{width:8px}.rail::-webkit-scrollbar-thumb{background:var(--line-bright);border-radius:6px;border:2px solid var(--bg)}
.rail a{text-decoration:none;color:var(--mute)}
.rail .r-top{display:flex;align-items:center;justify-content:space-between;padding:4px 8px 14px}
.rail .r-item{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:9px 12px;border-radius:9px;font-size:13px;font-weight:500;color:var(--mute);transition:.13s}
.rail .r-item:hover{background:var(--panel);color:var(--soft)}
.rail .r-item.on{background:var(--glow);color:var(--ink);font-weight:600}
.rail .r-item .b{font-family:var(--mono);font-size:10px;letter-spacing:.06em;color:var(--green)}
.rail .r-item .n{font-family:var(--mono);font-size:10.5px;color:var(--faint)}
.rail .r-group{margin-top:6px}
.rail .r-group>button{display:flex;align-items:center;justify-content:space-between;width:100%;padding:9px 12px;border:0;border-radius:9px;background:transparent;color:var(--mute);font:inherit;font-size:13px;font-weight:500;cursor:pointer;text-align:left;transition:.13s}
.rail .r-group>button:hover{background:var(--panel);color:var(--soft)}
.rail .r-group.on>button{color:var(--ink);font-weight:600}
.rail .r-group>button .car{font-size:10px;color:var(--faint);transition:transform .15s}
.rail .r-group.open>button .car{transform:rotate(90deg)}
.rail .r-group>.r-sub{display:none;flex-direction:column;gap:1px;padding:2px 0 4px}
.rail .r-group.open>.r-sub{display:flex}
.rail .r-sub .r-item{padding:7px 12px 7px 26px;font-size:12.5px;font-weight:400}
.rail .r-sub .r-sub .r-item{padding-left:40px;font-size:12px;color:var(--faint)}
.rail .r-item.legacy .n::after{content:"↗";margin-left:4px;color:var(--faint)}
.rail .r-foot{margin-top:auto;padding:12px;border:1px solid var(--line-soft);border-radius:12px;background:var(--bg2);font-size:11px;color:var(--faint);line-height:1.5}
.rail .r-foot b{color:var(--soft);font-weight:500}

/* page head inside the canvas */
.phead{display:flex;align-items:flex-end;justify-content:space-between;gap:14px;margin-bottom:14px}
.phead .crumb{font-size:11px;color:var(--faint);margin-bottom:4px}.phead .crumb a{color:var(--faint)}
.phead h1{font-family:var(--disp);font-weight:700;font-size:21px;letter-spacing:-.01em}
.phead .meta{font-family:var(--mono);font-size:11.5px;color:var(--faint)}
.ptabs{display:flex;gap:6px;flex-wrap:wrap}
.ptabs a,.ptabs button{padding:7px 12px;border-radius:8px;border:1px solid var(--line);background:var(--panel);color:var(--soft);font:inherit;font-size:12.5px;text-decoration:none;cursor:pointer}
.ptabs a.on,.ptabs button.on{background:var(--glow);color:var(--ink);border-color:transparent}
.obs{font-family:var(--mono);font-size:10px;letter-spacing:.08em;color:var(--amber);background:var(--amber-s);padding:2px 7px;border-radius:5px;margin-left:8px;text-transform:uppercase}

/* menu button + bottom tabs (phone) */
.menubtn{display:none}
.btabs{display:none}
@media(max-width:900px){
  .nav .tabs{display:none}
  .menubtn{display:inline-flex}
  .rail{position:fixed;left:0;top:54px;bottom:0;width:min(84vw,300px);z-index:40;transform:translateX(-102%);transition:transform .18s;box-shadow:0 0 0 100vw rgba(0,0,0,0)}
  .rail.open{transform:none;box-shadow:0 0 0 100vw rgba(0,0,0,.55)}
  .canvas{padding:14px 14px 76px}
  .btabs{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;left:0;right:0;bottom:0;height:56px;background:linear-gradient(0deg,#0b0d13,#090a10);border-top:1px solid var(--line);z-index:30}
  .btabs a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-size:11px;color:var(--faint);text-decoration:none}
  .btabs a.on{color:var(--ink)}
  .phead{flex-direction:column;align-items:flex-start}
  /* the cockpit panels were laid out for a wide screen; stack them */
  .hero{grid-template-columns:1fr;gap:14px}.hero .rings{justify-content:flex-start}.h-action{font-size:20px;overflow-wrap:anywhere}
  .cap{grid-template-columns:repeat(2,1fr)}
  .grid{gap:10px}.card,.s8,.s7,.s6,.s5,.s4,.s3{grid-column:span 12}
  .timeline{overflow-x:auto}
  .nav{gap:10px;padding:0 12px}.nav .brand{font-size:15px}.micro{gap:8px}
}

.micro.micro-empty{display:none}