:root{
  --paper:#EDEBE6;
  --paper-2:#E4E1DA;
  --card:#F6F4F0;
  --ink:#16181C;
  --muted:#6B7076;
  --hair:#CFCBC2;
  --raise:#B03A2E;
  --raise-soft:#E8CFC9;
  --call:#3F6B4A;
  --call-soft:#CFDCD1;
  --fold:#D6D3CC;
  --blue:#1B4B8F;
  --blue-soft:#D3DCEA;
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:'IBM Plex Sans',system-ui,sans-serif;
  font-size:14px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
button{font-family:inherit;cursor:pointer;}

/* ---------- top bar ---------- */
.topbar{
  display:flex;align-items:center;gap:24px;
  padding:0 18px;height:52px;
  border-bottom:1px solid var(--hair);
  background:var(--card);
  position:sticky;top:0;z-index:20;
  flex-wrap:wrap;
}
.brand{display:flex;align-items:baseline;gap:8px;}
.brand-mark{
  font-family:'Archivo',sans-serif;font-weight:700;font-size:15px;
  background:var(--ink);color:var(--paper);
  width:22px;height:22px;display:inline-flex;align-items:center;justify-content:center;
  transform:translateY(3px);
}
.brand-name{font-family:'Archivo',sans-serif;font-weight:600;font-size:16px;letter-spacing:-0.01em;}
.brand-sub{font-size:11px;color:var(--muted);letter-spacing:0.02em;}

.modules{display:flex;gap:2px;margin-left:auto;}
.mod-btn{
  background:none;border:none;padding:7px 11px;
  font-size:12px;font-weight:500;color:var(--muted);
  border-bottom:2px solid transparent;
}
.mod-btn:hover:not(:disabled){color:var(--ink);}
.mod-btn.is-active{color:var(--ink);border-bottom-color:var(--blue);}
.mod-btn:disabled{opacity:.35;cursor:not-allowed;}

.profile-switch{display:flex;align-items:center;gap:6px;}
.profile-label{font-size:10px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);}
.profile-btn{
  background:none;border:1px solid var(--hair);
  padding:4px 9px;font-size:11px;font-weight:500;color:var(--muted);
}
.profile-btn.is-active{background:var(--ink);color:var(--paper);border-color:var(--ink);}

/* ---------- layout ---------- */
.workspace{
  display:grid;
  grid-template-columns:132px minmax(0,1fr) 220px;
  gap:0;
  min-height:calc(100vh - 52px);
}

/* ---------- position ladder ---------- */
.ladder{
  border-right:1px solid var(--hair);
  padding:18px 0;
  background:var(--card);
}
.ladder-title{
  font-size:10px;text-transform:uppercase;letter-spacing:.12em;
  color:var(--muted);padding:0 14px 10px;
}
.ladder-list{position:relative;padding-left:14px;}
.ladder-list::before{
  content:"";position:absolute;left:21px;top:12px;bottom:12px;
  width:1px;background:var(--hair);
}
.pos-btn{
  display:flex;align-items:center;gap:9px;
  width:100%;background:none;border:none;
  padding:7px 12px 7px 0;text-align:left;
  font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:500;
  color:var(--muted);position:relative;
}
.pos-dot{
  width:7px;height:7px;border-radius:50%;
  background:var(--paper);border:1.5px solid var(--hair);
  flex-shrink:0;z-index:1;
}
.pos-btn.is-active{color:var(--ink);}
.pos-btn.is-active .pos-dot{background:var(--blue);border-color:var(--blue);}
.pos-btn.has-data .pos-dot{border-color:var(--ink);}
.pos-btn:hover{color:var(--ink);}
.pos-meta{margin-left:auto;font-size:10px;color:var(--muted);opacity:.8;}

/* ---------- main panel ---------- */
.panel{padding:18px 22px;min-width:0;}
.scenario-row{display:flex;align-items:center;gap:16px;margin-bottom:6px;flex-wrap:wrap;}
.scen-tabs{display:flex;border:1px solid var(--hair);}
.scen-tab{
  background:none;border:none;padding:6px 13px;
  font-size:12px;font-weight:500;color:var(--muted);
  border-right:1px solid var(--hair);
}
.scen-tab:last-child{border-right:none;}
.scen-tab.is-active{background:var(--ink);color:var(--paper);}

.vs-row{display:flex;align-items:center;gap:8px;margin:10px 0 4px;flex-wrap:wrap;}
.vs-label{font-size:10px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);}
.vs-btn{
  background:none;border:1px solid var(--hair);padding:4px 10px;
  font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--muted);
}
.vs-btn.is-active{background:var(--blue);color:#fff;border-color:var(--blue);}
.vs-btn.has-data{border-color:var(--ink);color:var(--ink);}

.grid-head{
  display:flex;align-items:baseline;gap:12px;
  margin:14px 0 8px;
}
.grid-title{
  font-family:'Archivo',sans-serif;font-weight:600;font-size:19px;
  letter-spacing:-0.01em;
}
.grid-stat{
  font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--muted);
  margin-left:auto;
}
.grid-stat b{color:var(--ink);font-weight:600;}

/* ---------- matrix ---------- */
.matrix{
  display:grid;
  grid-template-columns:repeat(13,minmax(0,1fr));
  border-top:1px solid var(--hair);
  border-left:1px solid var(--hair);
  max-width:660px;
  user-select:none;
  touch-action:none;
}
.cell{
  aspect-ratio:1;
  border-right:1px solid var(--hair);
  border-bottom:1px solid var(--hair);
  display:flex;align-items:center;justify-content:center;
  font-family:'IBM Plex Mono',monospace;
  font-size:10.5px;font-weight:500;
  background:var(--fold);
  color:#8C8880;
  cursor:crosshair;
}
.cell.a-raise{background:var(--raise);color:#fff;}
.cell.a-call{background:var(--call);color:#fff;}
.cell.a-fold{background:var(--fold);color:#8C8880;}
.cell.is-pair{font-weight:600;}
.cell:hover{outline:2px solid var(--blue);outline-offset:-2px;z-index:2;}

/* ---------- paint tools ---------- */
.tools{display:flex;align-items:center;gap:8px;margin-top:14px;flex-wrap:wrap;max-width:660px;}
.paint-btn{
  border:1px solid var(--hair);background:var(--card);
  padding:7px 14px;font-size:12px;font-weight:600;
  display:flex;align-items:center;gap:7px;color:var(--muted);
}
.paint-swatch{width:11px;height:11px;border:1px solid rgba(0,0,0,.15);}
.paint-btn.is-active{border-color:var(--ink);color:var(--ink);background:#fff;}
.tool-sep{width:1px;height:22px;background:var(--hair);}
.util-btn{
  border:1px solid var(--hair);background:none;
  padding:7px 11px;font-size:11.5px;color:var(--muted);
}
.util-btn:hover{border-color:var(--ink);color:var(--ink);}

.hint{
  font-size:11.5px;color:var(--muted);margin-top:12px;max-width:640px;line-height:1.5;
}

/* ---------- right rail ---------- */
.rail{
  border-left:1px solid var(--hair);
  padding:18px 16px;
  background:var(--card);
}
.rail-title{
  font-size:10px;text-transform:uppercase;letter-spacing:.12em;
  color:var(--muted);margin:0 0 10px;
}
.rail-block{margin-bottom:22px;}
.rail-note{font-size:11.5px;line-height:1.55;color:var(--muted);margin:0 0 8px;}
.rail-note b{color:var(--ink);font-weight:600;}
.rail-btn{
  display:block;width:100%;text-align:left;
  border:1px solid var(--hair);background:none;
  padding:8px 10px;font-size:11.5px;color:var(--ink);
  margin-bottom:5px;
}
.rail-btn:hover{border-color:var(--ink);background:#fff;}
.rail-btn.danger:hover{border-color:var(--raise);color:var(--raise);}

.legend{display:flex;flex-direction:column;gap:5px;}
.legend-row{display:flex;align-items:center;gap:8px;font-size:11px;color:var(--muted);}
.legend-sw{width:12px;height:12px;border:1px solid rgba(0,0,0,.15);}

/* ---------- toast ---------- */
.toast{
  position:fixed;bottom:20px;left:50%;transform:translateX(-50%) translateY(20px);
  background:var(--ink);color:var(--paper);
  padding:9px 16px;font-size:12.5px;
  opacity:0;pointer-events:none;transition:opacity .18s,transform .18s;
  z-index:60;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

/* ---------- responsive ---------- */
@media (max-width:1000px){
  .workspace{grid-template-columns:112px minmax(0,1fr);}
  .rail{
    grid-column:1 / -1;border-left:none;border-top:1px solid var(--hair);
    display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;
  }
  .rail-block{margin-bottom:0;}
}
@media (max-width:620px){
  .topbar{height:auto;padding:8px 12px;gap:10px;}
  .modules{margin-left:0;width:100%;overflow-x:auto;}
  .workspace{grid-template-columns:1fr;}
  .ladder{
    border-right:none;border-bottom:1px solid var(--hair);padding:12px 0;
  }
  .ladder-list{display:flex;overflow-x:auto;padding-left:0;}
  .ladder-list::before{display:none;}
  .pos-btn{width:auto;padding:6px 12px;}
  .pos-meta{display:none;}
  .panel{padding:14px;}
  .cell{font-size:9px;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;}
}

/* ============================================================
   Pot size drill
   ============================================================ */
.drill-wrap{
  display:grid;grid-template-columns:minmax(0,1fr) 240px;
  min-height:calc(100vh - 52px);
}
.drill-main{padding:22px 26px;min-width:0;}
.drill-rail{
  border-left:1px solid var(--hair);background:var(--card);
  padding:18px 16px;
}
.session-stats{margin-bottom:14px;}
.leak-row{
  display:flex;justify-content:space-between;gap:8px;
  font-size:11.5px;padding:5px 0;border-bottom:1px solid var(--hair);
}
.leak-tag{color:var(--raise);font-family:'IBM Plex Mono',monospace;font-size:10.5px;}

.scoreline{
  display:flex;gap:18px;align-items:baseline;
  padding-bottom:12px;border-bottom:1px solid var(--hair);margin-bottom:20px;
  font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);
}
.scoreline b{
  font-family:'IBM Plex Mono',monospace;font-size:15px;font-weight:600;
  color:var(--ink);letter-spacing:0;text-transform:none;
}

.scene{max-width:560px;}
.scene-line{font-size:14.5px;line-height:1.5;margin-bottom:2px;}
.depth{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--muted);margin-left:4px;}
.street-tag{
  font-size:10px;text-transform:uppercase;letter-spacing:.14em;
  color:var(--muted);margin:16px 0 8px;
}
.cards{display:flex;gap:6px;}
.cards.hole{margin-top:6px;}
.hand-label{
  font-size:10px;text-transform:uppercase;letter-spacing:.14em;
  color:var(--muted);margin-top:22px;
}
.card{
  width:46px;height:64px;background:#fff;border:1px solid var(--hair);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  font-family:'IBM Plex Mono',monospace;color:var(--ink);
}
.card .cr{font-size:19px;font-weight:600;line-height:1;}
.card .cs{font-size:14px;line-height:1.3;}
.card.red{color:var(--raise);}

.answers{display:flex;gap:7px;margin-top:26px;flex-wrap:wrap;max-width:560px;}
.ans-btn{
  border:1px solid var(--hair);background:var(--card);
  padding:11px 16px;font-size:13px;font-weight:600;color:var(--ink);
  flex:1 1 auto;min-width:92px;
}
.ans-btn:hover:not(:disabled){border-color:var(--ink);background:#fff;}
.ans-btn.is-correct{background:var(--call);border-color:var(--call);color:#fff;}
.ans-btn.is-wrong{background:var(--raise);border-color:var(--raise);color:#fff;}
.ans-btn:disabled{cursor:default;}

.verdict{margin-top:20px;max-width:620px;}
.verdict-card{border:1px solid var(--hair);border-left-width:3px;background:var(--card);padding:16px 18px;}
.verdict-card.v-right{border-left-color:var(--call);}
.verdict-card.v-near{border-left-color:#B8862E;}
.verdict-card.v-off{border-left-color:var(--raise);}
.verdict-head{display:flex;gap:10px;align-items:baseline;flex-wrap:wrap;margin-bottom:12px;}
.verdict-mark{
  font-family:'Archivo',sans-serif;font-weight:700;font-size:12px;
  text-transform:uppercase;letter-spacing:.1em;
}
.v-right .verdict-mark{color:var(--call);}
.v-near .verdict-mark{color:#B8862E;}
.v-off .verdict-mark{color:var(--raise);}
.verdict-sum{font-size:14px;}
.reasons{list-style:none;margin:0 0 12px;padding:0;}
.reasons li{
  font-size:12.5px;line-height:1.55;color:var(--ink);
  padding:6px 0 6px 12px;border-left:1px solid var(--hair);margin-bottom:2px;
}
.reasons .src{
  display:block;font-size:10px;color:var(--muted);
  text-transform:uppercase;letter-spacing:.08em;margin-top:2px;
}
.board-read{
  font-size:11.5px;color:var(--muted);
  padding-top:10px;border-top:1px solid var(--hair);
}
.next-btn{
  margin-top:14px;border:1px solid var(--ink);background:var(--ink);color:var(--paper);
  padding:9px 18px;font-size:12.5px;font-weight:600;
}
.next-btn:hover{background:#000;}

@media (max-width:900px){
  .drill-wrap{grid-template-columns:1fr;}
  .drill-rail{border-left:none;border-top:1px solid var(--hair);}
}
@media (max-width:620px){
  .drill-main{padding:14px;}
  .card{width:40px;height:56px;}
  .card .cr{font-size:17px;}
  .ans-btn{min-width:0;flex:1 1 30%;padding:10px 8px;font-size:12px;}
}