:root{
  --bg0:#070a10; --bg1:#0a1018; --bg2:#0b1422;
  --card:#0d1528; --card2:#101a30;
  --text:#e6f0f8; --muted:#9fb3c8; --faint:#7f93a8;
  --line:rgba(255,255,255,.09); --line2:rgba(255,255,255,.06);
  --accent:#34d399; --accent2:#22d3ee;
  --shadow:0 18px 60px rgba(0,0,0,.45);
  --radius:16px; --radius2:20px;
  /* modality colors */
  --m-CT:#34d399; --m-CTA:#10b981; --m-MR:#22d3ee; --m-US:#a78bfa;
  --m-XR:#94a3b8; --m-Fluoro:#f59e0b; --m-NM:#fb7185; --m-PET:#f472b6; --m-Mammo:#f9a8d4;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; color:var(--text);
  font:15px/1.5 system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji";
  background:
    radial-gradient(900px 450px at 12% -10%, rgba(52,211,153,.18), transparent 55%),
    radial-gradient(900px 500px at 95% 0%, rgba(34,211,238,.12), transparent 55%),
    linear-gradient(180deg,var(--bg0),var(--bg1) 60%,#061018);
  background-attachment:fixed;
}
a{color:inherit;text-decoration:none}

/* ---- top bar ---- */
.topbar{
  position:sticky; top:0; z-index:40;
  display:flex; align-items:center; gap:14px; flex-wrap:wrap;
  padding:12px 20px; border-bottom:1px solid var(--line);
  background:rgba(7,10,16,.82); backdrop-filter:blur(10px);
}
.brand{display:flex; align-items:center; gap:10px}
.brand img{width:26px;height:26px;border-radius:50%;filter:drop-shadow(0 0 5px rgba(34,211,238,.25))}
.brand strong{letter-spacing:.3px; font-size:17px}
.brand .sep{color:var(--muted); font-weight:600}
.spacer{flex:1}
.search{
  position:relative; flex:1 1 320px; max-width:520px; min-width:200px;
}
.search input{
  width:100%; padding:10px 14px 10px 38px; border-radius:999px;
  border:1px solid var(--line); background:rgba(0,0,0,.28); color:var(--text);
  font-size:14px; outline:none;
}
.search input:focus{border-color:rgba(52,211,153,.5); box-shadow:0 0 0 4px rgba(52,211,153,.12)}
.search svg{position:absolute; left:12px; top:50%; transform:translateY(-50%); opacity:.55}
.toolbtn{
  padding:9px 13px; border-radius:999px; border:1px solid var(--line);
  background:rgba(0,0,0,.22); color:var(--text); cursor:pointer; font-size:13px; font-weight:700;
}
.toolbtn:hover{border-color:rgba(52,211,153,.4)}

/* ---- layout ---- */
.layout{display:grid; grid-template-columns:248px 1fr; gap:0; max-width:1280px; margin:0 auto}
.sidebar{
  position:sticky; top:61px; align-self:start; height:calc(100vh - 61px); overflow-y:auto;
  padding:18px 12px 40px; border-right:1px solid var(--line);
}
.sidebar h4{margin:14px 8px 6px; font-size:11px; letter-spacing:.8px; text-transform:uppercase; color:var(--faint)}
.navitem{
  display:flex; align-items:center; justify-content:space-between; gap:8px;
  padding:8px 10px; border-radius:10px; cursor:pointer; color:var(--muted); font-weight:600; font-size:14px;
}
.navitem:hover{background:rgba(255,255,255,.04); color:var(--text)}
.navitem.active{background:linear-gradient(135deg,rgba(52,211,153,.18),rgba(34,211,238,.10)); color:var(--text); border:1px solid rgba(52,211,153,.30)}
.navitem .count{font-size:11px; font-weight:800; color:var(--faint); background:rgba(255,255,255,.06); padding:2px 7px; border-radius:999px}
.navitem.zero{opacity:.34}
.navitem.zero:hover{opacity:.6}
.sidebar h4.grp{display:flex; align-items:center; justify-content:space-between; gap:6px; cursor:pointer; user-select:none}
.sidebar h4.grp:hover{color:var(--muted)}
.sidebar h4.grp .chev{opacity:.55; transition:transform .15s; transform:rotate(90deg)}
.sidebar h4.grp.collapsed .chev{transform:rotate(0deg)}
.navitem.super{font-weight:700}
.navitem.super .suplabel{flex:1; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap}
.navitem.sub{margin-left:16px; font-size:13px; font-weight:600}
.navitem.sub .lbl{color:var(--muted)}
.suptog{flex:0 0 auto; background:none; border:0; color:var(--faint); cursor:pointer; padding:2px; margin-left:2px; display:inline-flex; align-items:center; border-radius:6px}
.suptog:hover{background:rgba(255,255,255,.10); color:var(--text)}
.suptog .chev{opacity:.75; transition:transform .15s}
.suptog.open .chev{transform:rotate(90deg)}
.dot{width:9px;height:9px;border-radius:3px;flex:0 0 auto}

.content{padding:22px 26px 80px; min-width:0}
.pagehead h1{margin:6px 0 6px; font-size:clamp(24px,3vw,34px); letter-spacing:-.5px}
.pagehead p{margin:0; color:var(--muted); max-width:80ch}
.disclaimer{
  margin:14px 0 6px; padding:11px 14px; border-radius:12px; font-size:12.5px;
  border:1px solid rgba(245,158,11,.30); background:rgba(245,158,11,.08); color:#ffe2b0;
}
.meta{display:flex; align-items:center; gap:10px; flex-wrap:wrap; margin:16px 0 6px; color:var(--muted); font-size:13px}

/* region section */
.region{margin-top:26px; scroll-margin-top:80px}
.region-title{
  display:flex; align-items:baseline; gap:10px; margin:0 0 12px;
  font-size:13px; letter-spacing:.5px; text-transform:uppercase; color:var(--muted);
  border-bottom:1px solid var(--line); padding-bottom:8px;
}
.region-title b{color:var(--text); font-size:16px; letter-spacing:0; text-transform:none}

.cards{display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:12px}

.card{
  border:1px solid var(--line); border-radius:var(--radius); overflow:hidden;
  background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(0,0,0,.10));
  transition:border-color .12s, transform .12s;
}
.card.open{grid-column:1 / -1; border-color:rgba(52,211,153,.35)}
.card-head{display:flex; align-items:flex-start; gap:10px; padding:13px 14px; cursor:pointer}
.card-head:hover{background:rgba(255,255,255,.03)}
.card-head .tt{flex:1; min-width:0}
.card-head h3{margin:0 0 5px; font-size:15.5px; letter-spacing:-.2px}
.chips{display:flex; gap:6px; flex-wrap:wrap}
.chip{font-size:10.5px; font-weight:800; letter-spacing:.3px; padding:3px 8px; border-radius:999px; border:1px solid var(--line); color:var(--muted)}
.chip.mod{color:#06210f}
.chip.region-chip{background:rgba(255,255,255,.05)}
.chip.contrast{background:rgba(34,211,238,.12); color:#bdf0fb; border-color:rgba(34,211,238,.3)}
.chip.noncon{background:rgba(255,255,255,.05); color:var(--faint)}
.chev{transition:transform .15s; opacity:.6; margin-top:2px}
.card.open .chev{transform:rotate(90deg)}

.card-body{display:none; padding:0 16px 16px; border-top:1px solid var(--line2)}
.card.open .card-body{display:block}
.sec{margin-top:14px}
.sec h5{margin:0 0 6px; font-size:11px; letter-spacing:.7px; text-transform:uppercase; color:var(--accent)}
.sec ul{margin:0; padding-left:18px}
.sec li{margin:3px 0}
.kv{display:flex; gap:8px; flex-wrap:wrap; font-size:13.5px}
.kv .k{color:var(--faint); min-width:64px}

table.series{width:100%; border-collapse:collapse; margin-top:4px; font-size:13px}
table.series th{text-align:left; padding:7px 9px; color:#cfe8dd; background:rgba(52,211,153,.10); border-bottom:1px solid var(--line); font-size:11px; letter-spacing:.4px; text-transform:uppercase}
table.series td{padding:7px 9px; border-bottom:1px solid var(--line2); vertical-align:top}
table.series tr:nth-child(even) td{background:rgba(255,255,255,.02)}
.num{color:var(--faint); width:30px}

.refs{font-size:12px; color:var(--faint)}
.refs a{color:var(--accent2); text-decoration:underline; text-underline-offset:2px}
.review{display:inline-block; margin-left:8px; font-size:10.5px; font-weight:800; color:#ffd9a8; background:rgba(245,158,11,.14); border:1px solid rgba(245,158,11,.3); padding:2px 7px; border-radius:999px}
.print-one{margin-top:14px}

.empty{padding:40px 10px; text-align:center; color:var(--muted)}
footer{max-width:1280px; margin:0 auto; padding:24px 26px 50px; color:var(--faint); font-size:12px; border-top:1px solid var(--line)}
footer a{color:var(--muted); text-decoration:underline; text-underline-offset:3px}

/* mobile */
.menuToggle{display:none}
@media (max-width:880px){
  .layout{grid-template-columns:1fr}
  .sidebar{position:fixed; left:0; top:61px; width:78%; max-width:300px; height:calc(100vh - 61px); z-index:50;
    background:var(--bg1); border-right:1px solid var(--line); transform:translateX(-105%); transition:transform .2s; box-shadow:var(--shadow)}
  .sidebar.show{transform:none}
  .menuToggle{display:inline-flex}
  .content{padding:18px 16px 70px}
  .cards{grid-template-columns:1fr}
  .scrim{position:fixed; inset:61px 0 0; background:rgba(0,0,0,.5); z-index:45; display:none}
  .scrim.show{display:block}
}

/* clickable list cards (anchors to /p/<id>/) */
.card{cursor:pointer; display:block; color:inherit}
.card:hover{border-color:rgba(52,211,153,.4); transform:translateY(-1px)}
.card:focus-visible{outline:2px solid rgba(52,211,153,.55); outline-offset:2px}

/* single-column standalone protocol pages */
.layout.single{grid-template-columns:1fr; max-width:980px}
.back-strong{border-color:rgba(52,211,153,.45); color:#cdeede; font-weight:800}
.back-strong:hover{background:rgba(52,211,153,.12)}
.card-head{align-items:center}
.chev{align-self:center; margin-left:auto; flex:0 0 auto}
.snippet{margin:8px 0 0; color:var(--muted); font-size:12.5px;
  display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden}

/* detail view */
body.detail-mode .pagehead,
body.detail-mode .disclaimer,
body.detail-mode .meta{display:none}
.detail{max-width:880px; margin:2px auto 0; animation:fade .16s ease}
@keyframes fade{from{opacity:0; transform:translateY(4px)}to{opacity:1; transform:none}}
.detail-top{display:flex; align-items:center; justify-content:space-between; gap:10px; margin-bottom:10px}
.detail-actions{display:flex; gap:8px}
.detail-title{margin:8px 0 10px; font-size:clamp(22px,3vw,31px); letter-spacing:-.4px}
.detail-chips{margin-bottom:4px}
.detail-body .sec{margin-top:18px}
.source-line{font-size:12px; color:var(--faint); margin-top:18px}
.prevnext{display:flex; justify-content:space-between; gap:12px; margin-top:30px}
.navbtn{display:block; flex:1 1 0; min-width:0; text-align:left; padding:11px 14px; border-radius:12px;
  border:1px solid var(--line); background:rgba(255,255,255,.03); color:var(--text); cursor:pointer}
.navbtn:hover{border-color:rgba(52,211,153,.4)}
.navbtn.next{text-align:right}
.navbtn span{display:block; font-size:11px; color:var(--accent); font-weight:800; letter-spacing:.4px}
.navbtn b{display:block; font-size:13.5px; margin-top:3px; white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
.detail-disclaimer{margin-top:22px; padding:11px 14px; border-radius:12px; font-size:12px;
  color:#ffe2b0; border:1px solid rgba(245,158,11,.3); background:rgba(245,158,11,.08)}

/* print: print only the open protocol detail */
@media print{
  body{background:#fff; color:#000}
  .topbar,.sidebar,.scrim,footer,.menuToggle,.detail-top,.prevnext,
  .detail-disclaimer,.meta,.disclaimer,.pagehead{display:none !important}
  .layout{display:block}
  .content{padding:0}
  .detail{max-width:none; margin:0}
  .sec h5{color:#000}
  table.series th{background:#eee; color:#000}
  .chip{color:#000; border-color:#999}
  a{color:#000; text-decoration:none}
}