:root{
  --bg:#f6f7f9; --panel:#ffffff; --ink:#15181d; --muted:#616a77;
  --line:#e1e5ea; --line-soft:#eef1f4;
  --accent:#1f5f8b; --accent-soft:#e8f1f8;
  --ok:#1f7a4d; --ok-soft:#e6f4ec;
  --warn:#8a5a00; --warn-soft:#fdf2dd;
  --err:#9b2226; --err-soft:#fbebec;
  --phy:#1f5f8b; --chem:#8a4a9b; --bio:#1f7a4d; --shared:#5a6673;
  --radius:10px; --shadow:0 1px 2px rgba(20,25,35,.06),0 4px 14px rgba(20,25,35,.04);
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#101317; --panel:#171b21; --ink:#e7eaee; --muted:#9aa5b1;
    --line:#272d35; --line-soft:#1f242b;
    --accent:#74b3dd; --accent-soft:#16242f;
    --ok:#6fcf9b; --ok-soft:#13241b;
    --warn:#e0b25e; --warn-soft:#2a2113;
    --err:#f08b8f; --err-soft:#2c1618;
    --phy:#74b3dd; --chem:#c79ad6; --bio:#6fcf9b; --shared:#9aa5b1;
    --shadow:0 1px 2px rgba(0,0,0,.4);
  }
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);
  font:15px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans SC","PingFang SC",sans-serif;}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.25;margin:0 0 .5rem}
h1{font-size:1.5rem;letter-spacing:-.01em}
h2{font-size:1.1rem}
h3{font-size:.95rem}
small{color:var(--muted)}

/* ---------- chrome ---------- */
.topbar{display:flex;align-items:center;gap:1.25rem;padding:.6rem 1.25rem;
  background:var(--panel);border-bottom:1px solid var(--line);flex-wrap:wrap;position:sticky;top:0;z-index:20}
.brand{display:flex;align-items:center;gap:.6rem;color:inherit}
.brand:hover{text-decoration:none}
.brand-mark{display:grid;place-items:center;width:32px;height:32px;border-radius:8px;
  background:var(--accent);color:#fff;font-weight:700;font-size:.8rem;letter-spacing:.02em}
.brand small{display:block;font-size:.72rem}
.mainnav{display:flex;gap:.25rem;flex-wrap:wrap;margin-right:auto}
.mainnav a{padding:.35rem .65rem;border-radius:7px;color:var(--muted);font-weight:500}
.mainnav a:hover{background:var(--line-soft);text-decoration:none;color:var(--ink)}
.mainnav a.on{background:var(--accent-soft);color:var(--accent)}
.topsearch input{width:200px}
.who{display:flex;align-items:center;gap:.75rem;font-size:.85rem}
.who small{display:block;text-transform:capitalize;font-size:.7rem}
.foot{text-align:center;color:var(--muted);font-size:.78rem;padding:2rem 1rem 3rem}

.wrap{max-width:1180px;margin:0 auto;padding:1.5rem 1.25rem}
.wide{max-width:1500px;margin:0 auto;padding:1.5rem 1.25rem}
.narrow{max-width:620px;margin:0 auto;padding:2.5rem 1.25rem}

/* ---------- blocks ---------- */
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:1.1rem 1.15rem;margin-bottom:1.1rem}
.panel > h2:first-child{margin-top:0}
.panel-head{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;margin-bottom:.8rem;flex-wrap:wrap}
.grid{display:grid;gap:1.1rem}
.g2{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}
.page-head{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;flex-wrap:wrap;margin-bottom:1.1rem}
.muted{color:var(--muted)}
.lede{color:var(--muted);margin:.15rem 0 0;max-width:62ch}

.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:.85rem 1rem}
.stat b{display:block;font-size:1.6rem;line-height:1.1;letter-spacing:-.02em}
.stat span{font-size:.78rem;color:var(--muted)}

/* ---------- forms ---------- */
label{display:block;font-size:.8rem;font-weight:600;color:var(--muted);margin:0 0 .25rem}
input,select,textarea{width:100%;padding:.5rem .6rem;border:1px solid var(--line);border-radius:8px;
  background:var(--panel);color:var(--ink);font:inherit;font-size:.9rem}
input:focus,select:focus,textarea:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}
textarea{min-height:90px;resize:vertical}
.field{margin-bottom:.85rem}
.row{display:flex;gap:.75rem;flex-wrap:wrap}
.row > *{flex:1 1 160px}
.check{display:flex;align-items:center;gap:.45rem;font-size:.85rem;font-weight:500;color:var(--ink)}
.check input{width:auto}

.btn{display:inline-flex;align-items:center;gap:.4rem;padding:.5rem .9rem;border-radius:8px;border:1px solid var(--accent);
  background:var(--accent);color:#fff;font:inherit;font-size:.87rem;font-weight:600;cursor:pointer}
.btn:hover{filter:brightness(1.08);text-decoration:none}
.btn.ghost,.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}
.ghost:hover{color:var(--ink);background:var(--line-soft);text-decoration:none}
.btn.danger{background:transparent;color:var(--err);border-color:var(--err)}
.btn.small{padding:.3rem .6rem;font-size:.78rem}
.btn-row{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center}

.flashes{margin-bottom:1rem;display:grid;gap:.5rem}
.flash{padding:.6rem .85rem;border-radius:8px;font-size:.88rem;border:1px solid}
.flash.ok{background:var(--ok-soft);border-color:var(--ok);color:var(--ok)}
.flash.error{background:var(--err-soft);border-color:var(--err);color:var(--err)}
.flash.warn{background:var(--warn-soft);border-color:var(--warn);color:var(--warn)}

/* ---------- tables ---------- */
table{width:100%;border-collapse:collapse;font-size:.88rem}
th{text-align:left;font-size:.72rem;text-transform:uppercase;letter-spacing:.04em;
  color:var(--muted);padding:.4rem .55rem;border-bottom:1px solid var(--line)}
td{padding:.55rem;border-bottom:1px solid var(--line-soft);vertical-align:top}
tr:last-child td{border-bottom:0}
.t-right{text-align:right}

/* ---------- tags ---------- */
.tag{display:inline-block;padding:.12rem .48rem;border-radius:999px;font-size:.72rem;
  font-weight:600;border:1px solid var(--line);color:var(--muted);white-space:nowrap}
.tag.phy{color:var(--phy);border-color:var(--phy)}
.tag.chem{color:var(--chem);border-color:var(--chem)}
.tag.bio{color:var(--bio);border-color:var(--bio)}
.tag.shared{color:var(--shared);border-color:var(--shared)}
.tag.ok{color:var(--ok);border-color:var(--ok);background:var(--ok-soft)}
.tag.warn{color:var(--warn);border-color:var(--warn);background:var(--warn-soft)}
.tag.err{color:var(--err);border-color:var(--err);background:var(--err-soft)}
.tag.hazard{color:var(--err);border-color:var(--err);background:var(--err-soft)}
.tags{display:flex;gap:.3rem;flex-wrap:wrap}

/* ---------- calendar ---------- */
.cal{width:100%;border-collapse:separate;border-spacing:2px;font-size:.78rem;table-layout:fixed}
.cal th{padding:.35rem;background:var(--line-soft);border-radius:6px;border:0}
.cal td{padding:0;border:0}
.slot{display:block;min-height:42px;border-radius:6px;border:1px dashed var(--line);
  padding:.25rem .35rem;color:var(--muted);background:var(--panel)}
a.slot:hover{border-style:solid;border-color:var(--accent);color:var(--accent);text-decoration:none}
.slot.taken{border-style:solid;background:var(--accent-soft);border-color:var(--accent);color:var(--ink)}
.slot.taken b{display:block;font-size:.76rem}
.slot.mine{background:var(--ok-soft);border-color:var(--ok)}
.daycol{min-width:150px}

/* ---------- guide ---------- */
.steps{counter-reset:s;list-style:none;padding:0;margin:.4rem 0}
.steps li{counter-increment:s;position:relative;padding:.35rem 0 .35rem 2rem;border-bottom:1px solid var(--line-soft)}
.steps li:last-child{border-bottom:0}
.steps li::before{content:counter(s);position:absolute;left:0;top:.35rem;width:1.4rem;height:1.4rem;
  border-radius:50%;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;
  font-size:.72rem;font-weight:700}
.bullets{margin:.3rem 0;padding-left:1.1rem}
.bullets li{margin:.2rem 0}
.callout{border-left:3px solid var(--warn);background:var(--warn-soft);padding:.6rem .8rem;border-radius:0 8px 8px 0;margin:.6rem 0}
.callout.danger{border-color:var(--err);background:var(--err-soft)}
.kv{display:grid;grid-template-columns:auto 1fr;gap:.3rem 1rem;font-size:.86rem}
.kv dt{color:var(--muted)}
.kv dd{margin:0}

.itemrow{display:flex;gap:.5rem;align-items:center;margin-bottom:.4rem}
.itemrow select{flex:1 1 auto}
.itemrow input[type=number]{width:90px;flex:0 0 auto}
.free{font-size:.75rem;color:var(--muted);min-width:70px;text-align:right}
.free.short{color:var(--err);font-weight:700}

.empty{text-align:center;color:var(--muted);padding:2rem 1rem;font-size:.9rem}
.list-reset{list-style:none;padding:0;margin:0}
.stack > * + *{margin-top:.75rem}

@media print{
  .topbar,.foot,.noprint{display:none!important}
  body{background:#fff}
  .panel{box-shadow:none;border:1px solid #ccc;break-inside:avoid}
}

/* ---------- occupancy heat scale ----------
   Sequential: ONE hue, light -> dark (steps 100/200/350/500/650 of the blue
   ramp).  The dark mode flips the anchor so "near zero" recedes toward the
   dark surface instead of glowing.  Every cell also prints its number, so
   colour is never the only encoding. */
:root{
  --heat-1:#cde2fb; --heat-t1:#16201e;
  --heat-2:#9ec5f4; --heat-t2:#16201e;
  --heat-3:#5598e7; --heat-t3:#16201e;
  --heat-4:#256abf; --heat-t4:#ffffff;
  --heat-5:#104281; --heat-t5:#ffffff;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --heat-1:#104281; --heat-t1:#e5ece8;
    --heat-2:#184f95; --heat-t2:#e5ece8;
    --heat-3:#256abf; --heat-t3:#ffffff;
    --heat-4:#5598e7; --heat-t4:#0d1614;
    --heat-5:#9ec5f4; --heat-t5:#0d1614;
  }
}
:root[data-theme="dark"]{
  --heat-1:#104281; --heat-t1:#e5ece8;
  --heat-2:#184f95; --heat-t2:#e5ece8;
  --heat-3:#256abf; --heat-t3:#ffffff;
  --heat-4:#5598e7; --heat-t4:#0d1614;
  --heat-5:#9ec5f4; --heat-t5:#0d1614;
}

.heat{width:100%;border-collapse:separate;border-spacing:3px;table-layout:fixed}
.heat th{border:0;padding:.3rem .4rem;background:var(--line-soft);border-radius:6px;
  font-size:.68rem;text-align:center}
.heat th.rowhead{text-align:left;width:88px;white-space:nowrap}
.heat td{border:0;padding:0}
.cell{display:block;min-height:46px;border-radius:7px;padding:.3rem .2rem;text-align:center;
  border:1px solid transparent;line-height:1.2}
.cell b{display:block;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:1rem;font-weight:600;
  font-variant-numeric:tabular-nums}
.cell span{display:block;font-size:.64rem;opacity:.8}
.cell.h0{background:var(--panel);border:1px dashed var(--line);color:var(--muted)}
.cell.h1{background:var(--heat-1);color:var(--heat-t1)}
.cell.h2{background:var(--heat-2);color:var(--heat-t2)}
.cell.h3{background:var(--heat-3);color:var(--heat-t3)}
.cell.h4{background:var(--heat-4);color:var(--heat-t4)}
.cell.h5{background:var(--heat-5);color:var(--heat-t5)}
.cell.over{background:var(--err-soft);border:1px solid var(--err);color:var(--err)}

.key{display:flex;gap:.9rem;align-items:center;flex-wrap:wrap;font-size:.76rem;color:var(--muted)}
.key-steps{display:flex;align-items:center;gap:2px}
.key-steps i{width:26px;height:14px;border-radius:3px;display:block}
.key-steps i.h0{border:1px dashed var(--line);background:var(--panel)}

.bar{height:7px;border-radius:99px;background:var(--line-soft);overflow:hidden;min-width:70px}
.bar>i{display:block;height:100%;background:var(--heat-4);border-radius:99px}
.bar.full>i{background:var(--err)}

/* ---------- language switch ---------- */
.langswitch{display:inline-flex;align-items:center;gap:.3rem;font-size:.78rem;
  border:1px solid var(--line);border-radius:7px;padding:.12rem .3rem}
.langswitch b{color:var(--accent);font-weight:600}
.langswitch a{color:var(--muted)}
.langswitch a:hover{color:var(--ink);text-decoration:none}
.langbar{max-width:620px;margin:0 auto;padding:1rem 1.25rem 0;text-align:right;
  display:flex;gap:.5rem;justify-content:flex-end;font-size:.82rem}
.langbar b{color:var(--accent)}