/* the rev coach — learning layer
   ADDITIVE ONLY. Linked by course.html + every lessons/*.html page.
   Does not touch brand.css. Uses brand tokens only (no new colours,
   no violet/indigo/magenta/pink, no gradients). */

/* ---------- skip link + focus ---------- */
.skip-link{position:absolute;left:8px;top:-48px;z-index:100;
  background:var(--accent);color:var(--on-accent);font-family:var(--mono);font-size:12px;
  padding:9px 14px;border-radius:7px;transition:top .12s ease;}
.skip-link:focus{top:8px;}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px;}

/* Sidebar sub-items under "AI field guide" are styled by a <style>
   block shell.js injects, so they render on every page including the six
   that link only brand.css. */

/* ---------- lesson page layout ---------- */
.lesson-head{padding:6px 0 20px;border-bottom:1px solid var(--line);margin-bottom:8px;}
.lesson-head .rung-tag{font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);}
.lesson-head h1{font-size:clamp(26px,4vw,36px);line-height:1.1;letter-spacing:-.02em;font-weight:600;margin:12px 0 0;max-width:22ch;}
.lesson-head .dek{color:var(--muted);font-size:15.5px;line-height:1.55;max-width:64ch;margin:14px 0 0;}
.lesson-meta{display:flex;flex-wrap:wrap;gap:8px 16px;margin-top:16px;
  font-family:var(--mono);font-size:11px;letter-spacing:.04em;color:var(--muted);}
.lesson-meta span{display:inline-flex;align-items:center;gap:6px;}
.lesson-meta span::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--accent);}

/* per-section time label */
.time-label{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);
  display:inline-flex;align-items:center;gap:7px;margin:0 0 2px;}
.time-label::before{content:"◷";color:var(--accent);font-size:13px;}

/* ---------- guide prose ---------- */
.prose{max-width:74ch;}
.prose h3{font-size:21px;font-weight:600;letter-spacing:-.015em;margin:34px 0 6px;}
.prose h3 .t{font-family:var(--mono);font-size:12px;color:var(--accent);margin-right:8px;}
.prose h4{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:26px 0 10px;
  display:flex;align-items:center;gap:10px;}
.prose h4::after{content:"";flex:1;height:1px;background:var(--line);}
.prose p{font-size:15.5px;line-height:1.62;color:var(--ink);margin:12px 0;}
.prose p .mut{color:var(--muted);}
.prose ul{margin:12px 0;padding-left:0;list-style:none;}
.prose ul li{position:relative;padding:7px 0 7px 22px;font-size:15px;line-height:1.55;border-bottom:1px solid var(--line);}
.prose ul li:last-child{border-bottom:0;}
.prose ul li::before{content:"▸";position:absolute;left:0;color:var(--accent);font-family:var(--mono);font-size:12px;top:9px;}
.prose ol{margin:12px 0;padding-left:22px;}
.prose ol li{font-size:15px;line-height:1.55;margin:7px 0;}
.prose b,.prose strong{font-weight:600;}
.prose code{font-family:var(--mono);font-size:.88em;background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent);
  padding:1px 6px;border-radius:4px;}
.kbd{font-family:var(--mono);font-size:.82em;border:1px solid var(--line-solid);border-bottom-width:2px;border-radius:5px;padding:2px 7px;color:var(--ink);background:var(--raised);}

/* command / terminal block */
.cmd{border:1px solid var(--line);border-radius:9px;background:var(--surface);overflow:hidden;margin:14px 0;position:relative;}
.cmd .bar{display:flex;align-items:center;gap:6px;padding:8px 12px;border-bottom:1px solid var(--line);}
.cmd .bar i{width:8px;height:8px;border-radius:50%;background:var(--faint);}
.cmd .bar .lbl{margin-left:8px;font-family:var(--mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);}
.cmd pre{margin:0;padding:13px 15px;font-family:var(--mono);font-size:13px;line-height:1.65;color:var(--ink);overflow-x:auto;white-space:pre;}
.cmd pre .p{color:var(--accent);} .cmd pre .c{color:var(--muted);} .cmd pre .g{color:var(--pos);}

/* copy-to-clipboard button (auto-added by course.js to every .cmd) */
.copy-btn{margin-left:auto;font-family:var(--mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--muted);background:transparent;border:1px solid var(--line);border-radius:5px;padding:4px 9px;cursor:pointer;
  display:inline-flex;align-items:center;gap:6px;transition:color .12s ease,border-color .12s ease;}
.copy-btn:hover{color:var(--ink);border-color:var(--line-solid);}
.copy-btn.copied{color:var(--pos);border-color:var(--pos);}
/* a .cmd with no .bar gets a floating button top-right */
.copy-btn.float{position:absolute;top:8px;right:8px;background:var(--surface);z-index:2;}

/* callouts */
.callout{border-left:2px solid var(--accent);background:color-mix(in srgb,var(--accent) 7%,transparent);border-radius:0 8px 8px 0;
  padding:12px 16px;margin:16px 0;font-size:14.5px;line-height:1.55;color:var(--ink);}
.callout.brk{border-color:var(--warn);background:color-mix(in srgb,var(--warn) 9%,transparent);}
.callout .h{font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:6px;}
.callout.brk .h{color:var(--warn);}
.callout ul{margin:6px 0 0;padding-left:0;list-style:none;}
.callout li{position:relative;padding:6px 0 6px 20px;line-height:1.5;border-bottom:1px solid var(--line);}
.callout li:last-child{border-bottom:0;}
.callout li::before{content:"▸";position:absolute;left:0;color:var(--accent);font-family:var(--mono);font-size:11px;top:7px;}
.callout code{font-family:var(--mono);font-size:.88em;background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent);padding:1px 6px;border-radius:4px;}

/* timed-action banner */
.timed{border:1px solid var(--accent);border-radius:10px;padding:18px 20px;margin:26px 0 8px;background:color-mix(in srgb,var(--accent) 6%,transparent);}
.timed .h{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);display:block;}
.timed ol{margin:10px 0 0;padding-left:22px;}
.timed li{font-size:15px;line-height:1.55;margin:7px 0;}
.timed code{font-family:var(--mono);font-size:.88em;background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent);padding:1px 6px;border-radius:4px;}

/* diagram wrapper + flow svg */
.diagram{border:1px solid var(--line);background:var(--surface);border-radius:11px;padding:18px;margin:16px 0;}
.diagram .dcap{font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:10px;}
.flowsvg{width:100%;height:auto;display:block;}
.flowsvg .box{fill:var(--raised);stroke:var(--line-solid);stroke-width:1.1;}
.flowsvg .box.hl{stroke:var(--accent);}
.flowsvg .bt{font-family:var(--mono);font-size:10.5px;font-weight:600;fill:var(--ink);}
.flowsvg .bs{font-family:var(--mono);font-size:8px;fill:var(--muted);}
.flowsvg .ln{fill:none;stroke:var(--accent);stroke-width:1.5;}
.flowsvg .ln.back{stroke:var(--c1);stroke-dasharray:3 4;}
.flowsvg .tip{fill:var(--accent);} .flowsvg .tip.back{fill:var(--c1);}
.flowsvg .cap{font-family:var(--mono);font-size:8.5px;fill:var(--muted);}

/* ---------- prev/next footer nav ---------- */
.lesson-nav{display:flex;justify-content:space-between;gap:14px;margin:36px 0 10px;padding-top:20px;border-top:1px solid var(--line);flex-wrap:wrap;}
.lesson-nav a{border:1px solid var(--line);border-radius:10px;padding:14px 18px;background:var(--surface);flex:1 1 220px;
  transition:border-color .12s ease;min-width:0;}
.lesson-nav a:hover{border-color:color-mix(in srgb,var(--accent) 50%,var(--line));}
.lesson-nav a.next{text-align:right;}
.lesson-nav .dir{font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);display:block;}
.lesson-nav .ttl{font-size:15px;font-weight:600;margin-top:5px;letter-spacing:-.01em;display:block;}
.lesson-nav a.disabled{opacity:.4;pointer-events:none;}

/* ---------- responsive ---------- */
@media(max-width:560px){
  .lesson-nav a{flex:1 1 100%;}
  .lesson-nav a.next{text-align:left;}
}

/* ---------- print (cheat sheet + lessons) ---------- */
@media print{
  /* reset tokens so lessons + cheat sheet print dark-on-white regardless of theme */
  body{--bg:#fff;--surface:#fff;--raised:#f4f3ee;--ink:#141414;--muted:rgba(20,20,20,.62);--faint:rgba(20,20,20,.45);--line:rgba(20,20,20,.16);--line-solid:#ddd;--accent:#0A7086;--pos:#0E9F63;
    background:#fff!important;color:#141414!important;}
  .side,.topbar,.skip-link,.copy-btn,.lesson-nav{display:none!important;}
  .app{display:block;} .content{padding:0;max-width:100%;}
}