:root{
  --paper:#EEF1F4; --panel:#FFFFFF; --ink:#14212B; --ink2:#2A3A47; --steel:#2F5D86; --steel-d:#234A6C; --hazard:#F4B400;
  --muted:#5E6C78; --line:#CBD3DA; --line2:#E2E7EB; --ok:#2E7D5B; --bad:#B3261E; --code:#F6F8FA;
  --f-head:'Barlow Condensed','Arial Narrow',system-ui,sans-serif; --f-body:'Barlow',system-ui,-apple-system,'Segoe UI',sans-serif; --f-mono:'IBM Plex Mono',ui-monospace,Consolas,monospace;
  --side:268px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.55 var(--f-body);color:var(--ink);background:var(--paper);
  background-image:linear-gradient(rgba(20,33,43,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(20,33,43,.035) 1px,transparent 1px);background-size:28px 28px}
h1,h2,h3,h4{font-family:var(--f-head);font-weight:600;line-height:1.12;margin:0 0 .5em;letter-spacing:.005em}
h1{font-size:2.5rem} h2{font-size:1.7rem} h3{font-size:1.28rem} h4{font-size:1.08rem}
p{margin:0 0 .8em} a{color:var(--steel)} small,.small{font-size:.86rem} .muted{color:var(--muted)}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--hazard);outline-offset:2px}
.hide{display:none!important} .row{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap} .grow{flex:1} .gap{gap:1rem}
.mt{margin-top:1rem} .mt2{margin-top:2rem} .mb0{margin-bottom:0}

/* ---------- buttons, chips ---------- */
.btn{display:inline-flex;align-items:center;gap:.4rem;border:1.5px solid var(--ink);background:transparent;color:var(--ink);padding:.42rem .85rem;border-radius:3px;cursor:pointer;font-weight:600;font-size:.95rem;line-height:1.2}
.btn:hover{background:var(--ink);color:#fff}
.btn.primary{background:var(--steel);border-color:var(--steel);color:#fff}.btn.primary:hover{background:var(--steel-d);border-color:var(--steel-d)}
.btn.hazard{background:var(--hazard);border-color:var(--hazard);color:var(--ink)}.btn.hazard:hover{background:#e0a400;border-color:#e0a400;color:var(--ink)}
.btn.small{padding:.25rem .6rem;font-size:.84rem}.btn.danger{border-color:var(--bad);color:var(--bad)}.btn.danger:hover{background:var(--bad);color:#fff}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.chip{display:inline-block;border:1px solid var(--line);border-radius:2px;padding:.05rem .45rem;font-size:.78rem;background:#fff;color:var(--ink2)}
.chip.team{border-color:var(--steel);color:var(--steel)} .chip.done{background:var(--ok);border-color:var(--ok);color:#fff}
.stripe{height:8px;background:repeating-linear-gradient(-45deg,var(--hazard) 0 8px,var(--ink) 8px 16px)}

/* ---------- login ---------- */
.login{min-height:100vh;display:grid;grid-template-columns:1.15fr 1fr}
.login-art{background:var(--ink);color:#EAF0F5;padding:3rem 3.2rem;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.login-art h1{font-size:3.4rem;max-width:12em;margin-bottom:.4em}
.login-art .org{font-family:var(--f-head);font-size:1.3rem;letter-spacing:.02em;color:var(--hazard)}
.login-art p{max-width:34em;color:#B8C6D2}
.sheet{border:1.5px solid #3B5163;margin-top:1.5rem;display:grid;grid-template-columns:1fr 1fr;max-width:30rem}
.sheet div{padding:.55rem .8rem;border-right:1.5px solid #3B5163;border-bottom:1.5px solid #3B5163}.sheet div:nth-child(2n){border-right:0}.sheet div:nth-last-child(-n+2){border-bottom:0}
.sheet b{display:block;font-family:var(--f-head);font-size:1.15rem;color:#fff}.sheet span{font-size:.8rem;color:#9FB2C2}
.login-form{display:flex;align-items:center;justify-content:center;padding:2rem}
.login-card{width:100%;max-width:25rem;background:var(--panel);border:1.5px solid var(--ink);border-radius:3px;padding:1.6rem}
.tabs{display:flex;border-bottom:1.5px solid var(--ink);margin:-0.2rem 0 1.1rem}
.tab{background:none;border:0;padding:.5rem .9rem;font-weight:600;cursor:pointer;color:var(--muted);border-bottom:4px solid transparent;margin-bottom:-1.5px}
.tab[aria-selected=true]{color:var(--ink);border-bottom-color:var(--hazard)}
label.f{display:block;font-weight:600;font-size:.92rem;margin:.8rem 0 .25rem}
input[type=text],input[type=password],input[type=email],input[type=number],select,textarea.in{width:100%;border:1.5px solid var(--line);background:#fff;border-radius:3px;padding:.5rem .65rem}
input:focus,select:focus,textarea:focus{border-color:var(--steel);outline:none;box-shadow:0 0 0 3px rgba(47,93,134,.18)}
.err{color:var(--bad);font-size:.9rem;margin-top:.7rem;min-height:1.2em}

/* ---------- shell ---------- */
.app{display:grid;grid-template-columns:var(--side) minmax(0,1fr);min-height:100vh}
.side{background:var(--ink);color:#DCE6EE;position:sticky;top:0;height:100vh;overflow:auto;display:flex;flex-direction:column}
.side .brand{padding:1.1rem 1.1rem .9rem;border-bottom:1.5px solid #3B5163}
.brand .org{font-family:var(--f-head);font-size:1.05rem;color:var(--hazard);letter-spacing:.03em}
.brand .name{font-family:var(--f-head);font-size:1.35rem;line-height:1.1;color:#fff;margin-top:.15rem}
.who{padding:.8rem 1.1rem;border-bottom:1.5px solid #3B5163;font-size:.9rem}.who b{color:#fff;font-size:1rem;display:block}.who .pts{margin-top:.35rem;color:var(--hazard);font-weight:600}
.nav{padding:.6rem 0 1rem;flex:1}
.nav h5{margin:.9rem 1.1rem .3rem;font:600 .78rem var(--f-body);letter-spacing:.06em;color:#8DA2B3}
.nav a{display:flex;align-items:center;gap:.6rem;padding:.42rem 1.1rem;color:#DCE6EE;text-decoration:none;border-left:4px solid transparent;font-size:.96rem}
.nav a:hover{background:#1E3140}.nav a[aria-current=page]{background:#1E3140;border-left-color:var(--hazard);color:#fff}
.nav .pct{margin-left:auto;font-size:.78rem;color:#9FB2C2}.nav .lock{margin-left:auto;font-size:.78rem}
.nav .num{font-family:var(--f-head);font-size:1.15rem;width:1.3rem;color:var(--hazard)}
.side .foot{padding:.8rem 1.1rem;border-top:1.5px solid #3B5163}
.side .foot button{background:none;border:1.5px solid #5A7184;color:#DCE6EE;border-radius:3px;padding:.3rem .7rem;cursor:pointer}
.main{padding:1.6rem 2.2rem 5rem;max-width:1080px;width:100%}
.topbar{display:none}
.banner{background:var(--hazard);color:var(--ink);padding:.55rem 1rem;font-weight:600;border:1.5px solid var(--ink);border-radius:3px;margin-bottom:1rem}
.panel{background:var(--panel);border:1.5px solid var(--ink);border-radius:3px;padding:1.1rem 1.2rem;margin-bottom:1rem}
.panel.soft{border-color:var(--line)}
.page-head{margin-bottom:1.2rem}.page-head .kicker{font-weight:600;color:var(--steel)}

/* ---------- home board ---------- */
.board{background:var(--panel);border:1.5px solid var(--ink);border-radius:3px;padding:1rem 1.2rem 1.2rem;margin-bottom:1.2rem}
.axis{position:relative;height:1.4rem;margin-left:5.2rem;font-size:.76rem;color:var(--muted)}
.axis span{position:absolute;transform:translateX(-50%)}
.lane{display:flex;align-items:stretch;margin:.35rem 0}
.lane .lbl{width:5.2rem;flex:none;font-family:var(--f-head);font-size:1.15rem;display:flex;align-items:center}
.track{position:relative;flex:1;height:4.3rem;background:repeating-linear-gradient(90deg,transparent 0,transparent calc(100%/15 - 1px),var(--line2) calc(100%/15 - 1px),var(--line2) calc(100%/15));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.blk{position:absolute;top:6px;bottom:6px;border:1.5px solid var(--ink);background:#fff;border-radius:2px;overflow:hidden;cursor:pointer;text-decoration:none;color:var(--ink);padding:.2rem .45rem;display:flex;flex-direction:column;justify-content:space-between}
.blk:hover{border-color:var(--steel);box-shadow:0 0 0 2px var(--steel)}
.blk .fill{position:absolute;left:0;bottom:0;height:7px;background:repeating-linear-gradient(-45deg,var(--hazard) 0 6px,var(--ink) 6px 12px)}
.blk b{font:600 .95rem/1.1 var(--f-head);position:relative}.blk small{font-size:.74rem;color:var(--muted);position:relative}
.blk.locked{background:var(--line2);color:var(--muted);cursor:not-allowed}
.nowline{position:absolute;top:-4px;bottom:-4px;width:3px;background:var(--bad)}
.nowline::after{content:'now';position:absolute;top:-1.05rem;left:-.7rem;font-size:.7rem;color:var(--bad);font-weight:600}
.break{position:absolute;top:0;bottom:0;background:repeating-linear-gradient(-45deg,transparent 0 5px,var(--line) 5px 6px)}
.list-sessions{display:none}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
.stat b{font-family:var(--f-head);font-size:2.2rem;display:block;line-height:1}.stat span{color:var(--muted);font-size:.88rem}
.meter{height:10px;background:var(--line2);border:1px solid var(--line);border-radius:2px;overflow:hidden}.meter i{display:block;height:100%;background:repeating-linear-gradient(-45deg,var(--hazard) 0 6px,var(--ink) 6px 12px)}.meter.ok i{background:var(--ok)}.meter.warn i{background:var(--bad)}

/* ---------- activities ---------- */
.obj{margin:0 0 1rem;padding-left:1.1rem}.obj li{margin:.15rem 0}
.act{background:var(--panel);border:1.5px solid var(--line);border-radius:3px;margin-bottom:.8rem}
.act.open{border-color:var(--ink)}
.act>header{display:flex;align-items:center;gap:.7rem;padding:.7rem 1rem;cursor:pointer;flex-wrap:wrap}
.act>header h3{margin:0;font-size:1.2rem}.act>header .tick{width:1.35rem;height:1.35rem;border:1.5px solid var(--ink);border-radius:50%;display:inline-grid;place-items:center;font-size:.8rem;flex:none}
.act.done>header .tick{background:var(--ok);border-color:var(--ok);color:#fff}
.act>.body{padding:.2rem 1rem 1rem;border-top:1px solid var(--line2)}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:.8rem;margin:.8rem 0}
.card{border:1.5px solid var(--line);border-radius:3px;padding:.8rem .9rem;background:#fff}.card h4{margin-bottom:.3rem}.card p{margin:0;font-size:.95rem}
.q{border:1.5px solid var(--line);border-radius:3px;padding:.8rem 1rem;margin:.7rem 0}.q.right{border-color:var(--ok)}.q.wrong{border-color:var(--bad)}
.opt{display:block;width:100%;text-align:left;border:1.5px solid var(--line);background:#fff;border-radius:3px;padding:.45rem .7rem;margin:.3rem 0;cursor:pointer}
.opt:hover:not([disabled]){border-color:var(--steel)}.opt.right{border-color:var(--ok);background:#EAF6F0}.opt.wrong{border-color:var(--bad);background:#FBEDEC}.opt.picked{outline:2px solid var(--ink)}
.why{margin:.5rem 0 0;font-size:.92rem;color:var(--ink2)}
.bar{display:flex;align-items:center;gap:.6rem;margin:.3rem 0}.bar .lab{width:13rem;flex:none;font-size:.92rem}.bar .track2{flex:1;height:1.2rem;background:var(--line2);border-radius:2px;overflow:hidden}.bar .track2 i{display:block;height:100%;background:var(--steel)}.bar .n{width:2rem;text-align:right;font-weight:600}
.field{margin:.7rem 0}.field label{display:block;font-weight:600;font-size:.93rem;margin-bottom:.25rem}
.field textarea{width:100%;min-height:4.6rem;border:1.5px solid var(--line);border-radius:3px;padding:.5rem .65rem;resize:vertical;background:#fff}
.stars{display:flex;gap:.3rem}.stars button{width:2.3rem;height:2.3rem;border:1.5px solid var(--line);background:#fff;border-radius:3px;cursor:pointer;font-weight:600}.stars button.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.saved{font-size:.8rem;color:var(--muted)}
.role{border:1.5px solid var(--line);border-radius:3px;padding:.7rem .9rem;display:flex;gap:.8rem;align-items:flex-start;margin:.5rem 0;background:#fff}.role.mine{border-color:var(--ink);background:#FFF8E0}
.role .nm{font-family:var(--f-head);font-size:1.2rem;min-width:7rem}
.post{border-bottom:1px solid var(--line2);padding:.6rem 0}.post b{font-weight:600}.post .meta{font-size:.8rem;color:var(--muted)}
.timer{font-family:var(--f-head);font-size:5rem;line-height:1;letter-spacing:.02em}.timer.over{color:var(--bad)}
table.t{border-collapse:collapse;width:100%;font-size:.92rem}table.t th,table.t td{border-bottom:1px solid var(--line2);padding:.4rem .5rem;text-align:left;vertical-align:top}table.t th{font-weight:600;background:#F7F9FA;border-bottom:1.5px solid var(--ink);position:sticky;top:0}
.scroll{overflow:auto;max-width:100%}
.md p{margin:.35em 0}.md ul,.md ol{margin:.3em 0;padding-left:1.2rem}.md code{font-family:var(--f-mono);font-size:.88em;background:var(--code);padding:.05rem .25rem;border-radius:2px}.md pre{background:var(--code);border:1px solid var(--line);padding:.55rem .7rem;overflow:auto;border-radius:3px}.md pre code{background:none;padding:0}.md h1,.md h2,.md h3{font-size:1.1rem;margin:.6em 0 .2em}
.badge{display:inline-flex;align-items:center;gap:.4rem;border:1.5px solid var(--line);border-radius:3px;padding:.3rem .6rem;margin:.2rem .3rem .2rem 0;color:var(--muted);background:#fff}.badge.on{border-color:var(--ink);color:var(--ink);background:#FFF3C4}

/* ---------- notebook ---------- */
.nb-bar{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;margin:.8rem 0;padding:.5rem .7rem;background:#F7F9FA;border:1px solid var(--line);border-radius:3px}
.pill{display:inline-flex;align-items:center;gap:.4rem;font-size:.82rem;border:1px solid var(--line);border-radius:20px;padding:.1rem .6rem;background:#fff}.pill i{width:.55rem;height:.55rem;border-radius:50%;background:var(--muted)}.pill.ready i{background:var(--ok)}.pill.busy i{background:var(--hazard)}.pill.err i{background:var(--bad)}
.seg{display:inline-flex;border:1.5px solid var(--ink);border-radius:3px;overflow:hidden}.seg button{border:0;background:#fff;padding:.25rem .7rem;cursor:pointer;font-weight:600;font-size:.88rem}.seg button[aria-pressed=true]{background:var(--ink);color:#fff}
.cell{display:grid;grid-template-columns:3.6rem minmax(0,1fr);gap:.5rem;margin:.6rem 0}
.cell .gut{font:.78rem var(--f-mono);color:var(--muted);padding-top:.55rem;text-align:right}
.cell textarea.code{width:100%;font:.88rem/1.5 var(--f-mono);background:var(--code);border:1.5px solid var(--line);border-radius:3px;padding:.5rem .65rem;resize:none;overflow:hidden;white-space:pre;tab-size:4;min-height:2.6rem}
.cell textarea.code:focus{border-color:var(--steel);outline:none}
.cell .tools{display:flex;gap:.4rem;margin:.3rem 0}
.out{font:.84rem/1.45 var(--f-mono);white-space:pre-wrap;border-left:4px solid var(--steel);padding:.35rem .7rem;margin-top:.4rem;background:#fff;overflow:auto;max-height:26rem}.out.err{border-left-color:var(--bad);color:var(--bad)}.out img{max-width:100%;display:block;margin:.3rem 0}
.out .df-wrap{overflow:auto}table.df{border-collapse:collapse;font:.8rem var(--f-mono);margin:.2rem 0}table.df th,table.df td{border:1px solid var(--line);padding:.15rem .45rem;text-align:right}table.df thead th{background:#F1F4F6}table.df tbody th{background:#F7F9FA;text-align:left}
.mdcell{margin:.6rem 0 .6rem 4.1rem}.mdcell h1{font-size:1.5rem}.mdcell h2{font-size:1.25rem}
.cell.run textarea.code{border-color:var(--ok)}

/* ---------- helper drawer ---------- */
.fab{position:fixed;right:1.2rem;bottom:1.2rem;z-index:40;background:var(--hazard);border:2px solid var(--ink);color:var(--ink);font-weight:700;border-radius:3px;padding:.65rem 1rem;cursor:pointer;display:flex;gap:.5rem;align-items:center}
.drawer{position:fixed;top:0;right:0;bottom:0;width:min(430px,100vw);background:var(--panel);border-left:2px solid var(--ink);z-index:50;display:flex;flex-direction:column;transform:translateX(102%);transition:transform .22s ease}
.drawer.open{transform:none}
.drawer header{padding:.7rem 1rem;border-bottom:1.5px solid var(--ink);background:var(--ink);color:#fff;display:flex;justify-content:space-between;align-items:center}.drawer header h3{margin:0;color:#fff}
.drawer .modes{display:flex;border-bottom:1px solid var(--line)}.drawer .modes button{flex:1;border:0;background:#F7F9FA;padding:.5rem .2rem;cursor:pointer;font-weight:600;font-size:.88rem;border-bottom:4px solid transparent}.drawer .modes button[aria-selected=true]{background:#fff;border-bottom-color:var(--hazard)}
.drawer .hint{padding:.5rem 1rem;font-size:.86rem;color:var(--muted);border-bottom:1px solid var(--line2)}
.msgs{flex:1;overflow:auto;padding:.8rem 1rem}
.m{margin:.55rem 0;max-width:94%;padding:.5rem .75rem;border-radius:3px;border:1.5px solid var(--line)}.m.me{margin-left:auto;background:#EAF1F7;border-color:#B9CEDF}.m.ai{background:#fff}.m.bad{border-color:var(--bad);color:var(--bad)}
.dots span{display:inline-block;width:6px;height:6px;margin:0 2px;background:var(--muted);border-radius:50%;animation:b 1s infinite}.dots span:nth-child(2){animation-delay:.15s}.dots span:nth-child(3){animation-delay:.3s}@keyframes b{50%{transform:translateY(-4px)}}
.compose{border-top:1.5px solid var(--ink);padding:.6rem .8rem}.compose textarea{width:100%;border:1.5px solid var(--line);border-radius:3px;padding:.45rem .6rem;resize:none;height:4.2rem}
.quick{display:flex;flex-wrap:wrap;gap:.35rem;margin-bottom:.5rem}.quick button{border:1px solid var(--line);background:#fff;border-radius:20px;padding:.15rem .6rem;cursor:pointer;font-size:.82rem}.quick button:hover{border-color:var(--steel)}
.ctxchip{display:flex;justify-content:space-between;gap:.5rem;align-items:center;background:#FFF8E0;border:1px solid var(--hazard);padding:.25rem .5rem;font-size:.82rem;margin-bottom:.4rem;border-radius:3px}
.toast{position:fixed;left:50%;bottom:1.5rem;transform:translateX(-50%);background:var(--ink);color:#fff;padding:.55rem 1rem;border-radius:3px;z-index:99;max-width:90vw}.toast.bad{background:var(--bad)}
.modal-back{position:fixed;inset:0;background:rgba(20,33,43,.55);z-index:80;display:grid;place-items:center;padding:1rem}.modal{background:#fff;border:2px solid var(--ink);border-radius:3px;max-width:34rem;width:100%;padding:1.2rem;max-height:90vh;overflow:auto}

/* ---------- certificate and print ---------- */
.cert{border:6px double var(--ink);padding:3rem 2rem;text-align:center;background:#fff;max-width:760px;margin:0 auto}.cert h1{font-size:3rem}.cert .nm{font-family:var(--f-head);font-size:2.6rem;border-bottom:2px solid var(--ink);display:inline-block;padding:0 2rem;margin:1rem 0}
.print-only{display:none}
@media print{
  body{background:#fff}.side,.fab,.drawer,.topbar,.no-print,.toast{display:none!important}.app{display:block}.main{padding:0;max-width:none}
  .print-only{display:block}.panel,.act{border-color:#000!important;break-inside:avoid}
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .login{grid-template-columns:1fr}.login-art{padding:1.6rem}.login-art h1{font-size:2.3rem}
  .app{display:block}.side{position:fixed;z-index:60;width:var(--side);transform:translateX(-102%);transition:transform .2s}.side.open{transform:none}
  .topbar{display:flex;align-items:center;gap:.8rem;background:var(--ink);color:#fff;padding:.6rem 1rem;position:sticky;top:0;z-index:30}.topbar button{background:none;border:1.5px solid #5A7184;color:#fff;border-radius:3px;padding:.25rem .6rem;font-size:1.1rem}
  .topbar .t{font-family:var(--f-head);font-size:1.25rem}
  .main{padding:1rem 1rem 6rem}.grid2,.grid3{grid-template-columns:1fr}
  .lane,.axis{display:none}.list-sessions{display:grid;gap:.5rem}
  .cell{grid-template-columns:1fr}.cell .gut{text-align:left;padding:0}.mdcell{margin-left:0}
  .bar .lab{width:8rem}h1{font-size:2rem}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}