/* ---------------------------------------------------------------------------
 * /train/knowledge
 *
 * CSS Pass A: the entire <style> block from eu_knowledge.html, moved verbatim.
 *
 * Pass B has now been done on the :root block, across all 22 page sheets that
 * had one: every declaration tokens.css already made with the same value was
 * removed, and nothing else was touched. The page sheet loads after tokens.css
 * and the values were equal, so the cascade result is unchanged by
 * construction. --mono and --disp stay because they are NOT equal -- see the
 * note at the top of tokens.css.
 * ------------------------------------------------------------------------- */
  :root{
    --lock:#3A5674;
    --mono:'IBM Plex Mono',monospace;
    --disp:'Space Grotesk',sans-serif;
  }
  *{box-sizing:border-box;}
  body{margin:0;background:linear-gradient(var(--grid) 1px,transparent 1px) 0 0/32px 32px,linear-gradient(90deg,var(--grid) 1px,transparent 1px) 0 0/32px 32px,var(--bg);color:var(--ink);font-family:var(--mono);min-height:100vh;}
  .wrap{max-width:900px;margin:0 auto;padding:22px 16px 70px;}
  .hidden{display:none !important;}
  a{color:var(--line);}

  header.top{display:flex;justify-content:space-between;align-items:flex-start;border-bottom:1px solid var(--line-dim);padding-bottom:14px;margin-bottom:22px;flex-wrap:wrap;gap:12px;}
  .brand-eyebrow{font-size:11px;letter-spacing:.14em;color:var(--line);text-transform:uppercase;}
  h1{font-family:var(--disp);font-weight:700;font-size:23px;margin:4px 0 0;}
  .hud{display:flex;gap:16px;align-items:center;flex-wrap:wrap;}
  .hud-item{font-size:11px;color:var(--ink-dim);text-align:right;}
  .hud-item b{display:block;font-family:var(--disp);font-size:16px;color:var(--ink);}
  .hud-item.weak b{color:var(--drill);}
  .navbtn{background:transparent;border:1px solid var(--line-dim);color:var(--ink-dim);font-family:var(--mono);font-size:11px;padding:8px 14px;border-radius:2px;cursor:pointer;letter-spacing:.05em;text-transform:uppercase;}
  .navbtn:hover{border-color:var(--line);color:var(--line);}

  .frame{position:relative;background:var(--panel);border:1px solid var(--line-dim);border-radius:2px;padding:24px 20px 20px;}
  .frame::before,.frame::after,.tick-bl,.tick-br{content:"";position:absolute;width:12px;height:12px;border-color:var(--line);border-style:solid;}
  .frame::before{top:-1px;left:-1px;border-width:2px 0 0 2px;}
  .frame::after{top:-1px;right:-1px;border-width:2px 2px 0 0;}
  .tick-bl{bottom:-1px;left:-1px;border-width:0 0 2px 2px;}
  .tick-br{bottom:-1px;right:-1px;border-width:0 2px 2px 0;}
  .frame.exam{border-color:rgba(242,169,59,.4);}

  /* mode cards */
  .modes{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:26px;}
  @media(max-width:700px){.modes{grid-template-columns:1fr;}}
  .mode{background:var(--panel);border:1px solid var(--line-dim);border-radius:3px;padding:16px 16px 14px;cursor:pointer;transition:border-color .15s,transform .1s;}
  .mode:hover{border-color:var(--line);transform:translateY(-2px);}
  .mode.disabled{opacity:.45;cursor:not-allowed;}
  .mode.disabled:hover{transform:none;border-color:var(--line-dim);}
  .mode .k{font-size:9.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--line);}
  .mode h3{font-family:var(--disp);font-size:15px;margin:6px 0 5px;}
  .mode p{font-size:11px;color:var(--ink-dim);margin:0;line-height:1.55;}
  .mode.exam{border-color:rgba(242,169,59,.35);}
  .mode.exam .k{color:var(--bad);}
  .mode.weak .k{color:var(--drill);}

  /* chapter list */
  .sect-label{font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-dim);margin:0 0 12px;border-bottom:1px solid var(--line-dim);padding-bottom:7px;}
  .chapters{display:flex;flex-direction:column;gap:9px;}
  .ch-node{display:flex;align-items:center;gap:15px;background:var(--panel);border:1px solid var(--line-dim);border-radius:3px;padding:14px 16px;cursor:pointer;transition:border-color .15s,transform .1s;}
  .ch-node:hover{border-color:var(--line);transform:translateX(2px);}
  .ch-node.done{border-color:rgba(111,231,179,.4);}
  .ch-num{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--disp);font-weight:700;font-size:12px;flex-shrink:0;border:2px solid var(--line);color:var(--line);}
  .ch-node.done .ch-num{background:var(--ok);border-color:var(--ok);color:#04241A;}
  .ch-body{flex:1;min-width:0;}
  .ch-title{font-family:var(--disp);font-size:14px;margin:0 0 3px;}
  .ch-sub{font-size:11px;color:var(--ink-dim);margin:0;line-height:1.5;}
  .ch-meter{width:96px;flex-shrink:0;text-align:right;}
  .ch-meter .bar{height:4px;background:var(--panel-2);border-radius:2px;overflow:hidden;margin-bottom:5px;}
  .ch-meter .bar i{display:block;height:100%;background:var(--ok);}
  .ch-meter span{font-size:10px;color:var(--ink-dim);}
  .volatile-tag{font-size:9px;letter-spacing:.08em;text-transform:uppercase;padding:2px 7px;border-radius:8px;border:1px solid var(--bad);color:var(--bad);white-space:nowrap;}

  /* quiz */
  .q-kicker{font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--line);margin:0 0 10px;display:flex;justify-content:space-between;gap:10px;}
  .q-kicker .idx{color:var(--ink-dim);}
  .q-text{font-family:var(--disp);font-size:16.5px;line-height:1.5;margin:0 0 18px;}
  .options-stack{display:flex;flex-direction:column;gap:9px;margin-bottom:6px;}
  .choice{background:var(--panel-2);border:1px solid var(--line-dim);border-radius:2px;cursor:pointer;transition:border-color .15s;text-align:left;font-family:var(--mono);color:var(--ink);font-size:13px;line-height:1.55;padding:12px 14px;display:flex;gap:11px;align-items:flex-start;}
  .choice:hover{border-color:var(--line);}
  .choice .ltr{font-family:var(--disp);font-weight:600;color:var(--line);flex-shrink:0;}
  .choice.disabled{cursor:default;}
  .choice.correct{border-color:var(--ok);background:rgba(111,231,179,.08);}
  .choice.correct .ltr{color:var(--ok);}
  .choice.wrong{border-color:var(--bad);background:rgba(242,169,59,.07);}
  .choice.wrong .ltr{color:var(--bad);}
  .choice:focus-visible{outline:2px solid var(--line);outline-offset:2px;}

  .explain{margin-top:16px;border-top:1px solid var(--line-dim);padding-top:14px;}
  .verdict{font-family:var(--disp);font-size:13px;letter-spacing:.06em;text-transform:uppercase;margin:0 0 9px;}
  .verdict.ok{color:var(--ok);} .verdict.no{color:var(--bad);}
  .explain p{font-size:12.5px;line-height:1.72;color:var(--ink);margin:0 0 10px;}
  .explain .trap{font-size:12px;line-height:1.7;color:var(--ink-dim);border-left:2px solid var(--drill);padding-left:11px;margin:0 0 10px;}
  .src{font-size:11px;color:var(--ink-dim);word-break:break-word;}
  .src a{text-decoration:none;border-bottom:1px dotted var(--line-dim);}

  /* The end-of-run review. One row per question, in the order they were asked.
     The verdict is carried by the left edge and the verdict word -- red for
     wrong, green for right -- and nothing else: no frame, no fill, no radius
     per row, so ten of them read as one list rather than ten objects.
     --crit is the site token and is deliberately redder than this page's own
     --bad, which is the amber used on a live option you have just got wrong.
     Here the run is over and the colour is a verdict, not a warning. */
  .rev{display:flex;flex-direction:column;gap:2px;}
  .rev-i{border-left:3px solid var(--line-dim);padding:13px 0 12px 15px;}
  .rev-i.ok{border-left-color:var(--ok);}
  .rev-i.no{border-left-color:var(--crit);}
  .rev-i.skip{border-left-color:var(--bad);}
  .rev-h{display:flex;align-items:baseline;gap:10px;margin:0 0 6px;font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;}
  .rev-n{color:var(--ink-dim);}
  .rev-i.ok .rev-v{color:var(--ok);}
  .rev-i.no .rev-v{color:var(--crit);}
  .rev-i.skip .rev-v{color:var(--bad);}
  .rev-c{color:var(--ink-dim);margin-left:auto;text-transform:none;letter-spacing:.04em;text-align:right;}
  .rev-q{font-family:var(--disp);font-size:14px;line-height:1.5;margin:0 0 7px;color:var(--ink);}
  .rev-a{font-size:12.5px;line-height:1.6;margin:0 0 6px;color:var(--ok);}
  .rev-x{font-size:12.5px;line-height:1.6;margin:0 0 6px;color:var(--crit);}
  .rev-e{font-size:12.5px;line-height:1.72;margin:0 0 6px;color:var(--ink-dim);}
  .footer-row{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:16px;flex-wrap:wrap;}
  .btn{background:transparent;border:1px solid var(--line-dim);color:var(--ink-dim);font-family:var(--mono);font-size:12px;padding:10px 18px;border-radius:2px;cursor:pointer;letter-spacing:.05em;}
  .btn:hover{border-color:var(--line);color:var(--line);}
  .btn.primary{border-color:var(--line);color:var(--line);}
  .btn.primary:hover{background:var(--line);color:var(--bg);}
  .end-note{font-size:11px;color:var(--ink-dim);}

  .progress-strip{display:flex;gap:3px;margin-bottom:16px;flex-wrap:wrap;}
  .pip{width:16px;height:4px;background:var(--panel-2);border-radius:1px;}
  .pip.ok{background:var(--ok);} .pip.no{background:var(--bad);} .pip.now{background:var(--line);}

  .notice{background:var(--panel-2);border:1px solid var(--line-dim);border-left:3px solid var(--bad);padding:13px 15px;border-radius:2px;font-size:12px;line-height:1.7;color:var(--ink-dim);margin-bottom:18px;}
  .notice b{color:var(--ink);}

  table.sum{width:100%;border-collapse:collapse;font-size:12px;margin:14px 0 0;}
  table.sum td,table.sum th{border-bottom:1px solid var(--line-dim);padding:8px 6px;text-align:left;}
  table.sum th{color:var(--line);font-size:10px;letter-spacing:.06em;text-transform:uppercase;font-weight:600;}
  table.sum td.r{text-align:right;color:var(--ink-dim);}
  .timer{font-family:var(--disp);font-size:16px;color:var(--bad);}
  .timer.low{color:#FF6B6B;}