/* The public lesson pages. The site's own palette, one column, readable on a phone. */
.learn{max-width:680px;margin:0 auto;padding:28px 18px 60px}
.learn .kicker{font-family:var(--mono);font-size:11px;letter-spacing:.15em;text-transform:uppercase;color:var(--accent);margin:18px 0 0}
.learn .kicker a{color:var(--accent);text-decoration:none}
.learn h1{font-size:28px;line-height:1.2;margin:10px 0 8px}
.learn .idea{font-size:17px;color:var(--ink);line-height:1.55;margin:0 0 6px}
.learn .sec{margin-top:24px;border-top:1px solid var(--line);padding-top:16px}
.learn h2{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin:0 0 8px;font-weight:500}
.learn h2 small{margin-left:8px;letter-spacing:0;text-transform:none;color:var(--faint)}
.learn h3{font-size:14px;margin:16px 0 6px;color:var(--dim);font-weight:600}
.learn p{color:var(--dim);line-height:1.6;font-size:15px;margin:0 0 8px}
.learn .worked{display:flex;flex-direction:column;gap:6px}
.learn .wl{display:grid;grid-template-columns:minmax(0,1fr);gap:2px;border:1px solid var(--line);border-radius:10px;padding:8px 10px;background:#0a0e12}
.learn .wl pre{margin:0;font-family:var(--mono);font-size:13px;line-height:1.5;color:var(--ink);white-space:pre-wrap;word-break:break-word}
.learn .wl .wn{font-size:14px;color:var(--accent);line-height:1.5}
.learn pre.fade{font-family:var(--mono);font-size:13px;line-height:1.5;color:var(--ink);background:#0a0e12;border:1px solid var(--line);border-radius:10px;padding:10px 12px;white-space:pre-wrap;word-break:break-word;margin:6px 0}
.learn .fine{font-size:13.5px;color:var(--faint);line-height:1.5}
.learn .trap p{color:var(--warn)}
.learn .cta{margin-top:28px;padding:16px;border:1px solid var(--accent-dk);border-radius:14px;background:rgba(110,231,168,.05);display:flex;flex-direction:column;gap:8px}
.learn .cta .go{display:inline-block;background:var(--accent);color:#06130c;text-decoration:none;font-weight:600;padding:11px 16px;border-radius:10px;width:max-content;max-width:100%}
.learn .cta span{font-size:14px;color:var(--dim);line-height:1.5}
.learn nav{margin-top:26px;display:flex;flex-wrap:wrap;gap:14px;font-size:14.5px}
.learn nav a{color:var(--dim);text-decoration:none;border-bottom:1px solid var(--line2);padding-bottom:1px}
.learn.index ul{list-style:none;padding:0;margin:0 0 6px}
.learn.index li{padding:8px 0;border-bottom:1px solid var(--line);font-size:15px}
.learn.index li a{color:var(--ink);text-decoration:none}
.learn.index li a:hover{color:var(--accent)}
.learn.index li small{font-family:var(--mono);font-size:11px;color:var(--faint);margin-left:8px}
.learn .jump{font-size:14px}
.learn .jump a{color:var(--accent);text-decoration:none}
@media (min-width:640px){
  .learn .wl{grid-template-columns:minmax(0,3fr) minmax(0,2fr);gap:12px;align-items:start}
  .learn .wl .wn{font-size:13px}
}
.learn .jump{display:block;font-size:14px;margin:0 0 8px}

/* THE QUICK REFERENCE: one row per topic, the name beside its one line. */
.learn .ref{display:flex;flex-direction:column}
.learn .rr{display:grid;grid-template-columns:minmax(0,1fr);gap:2px;padding:8px 0;border-top:1px solid var(--line)}
.learn .rr:first-child{border-top:0}
.learn .rr b{color:var(--ink);font-size:14px}
.learn .rr .one{color:var(--dim);font-size:14.5px;line-height:1.55}
.learn .rr .one a{color:var(--accent);text-decoration:none}
/* NOT nowrap. These links are whole sentences -- "Read: A subclass gets
   the parent's methods and can change some" -- and the page clips at the
   body edge, so a link that refuses to wrap is not scrolled to, it is
   gone. Measured: 7 links past the right edge on a 390px phone and 32 on
   a 320px one, up to 165px of the sentence cut off, on every track's
   reference page. */
@media (min-width:640px){ .learn .rr{grid-template-columns:170px minmax(0,1fr);gap:12px} }

/* WHAT THIS IS, for somebody who arrived by accident.
   Set apart from the page's own opening line rather than blended into it: a
   reader who already knows what Hone is should be able to see in one glance
   that this paragraph is not for them and skip it, and a reader who does not
   should be able to see that it is. Quieter than the idea above it, louder
   than the fine print below. */
.learn .whatis{color:var(--dim);font-size:14px;line-height:1.65;margin:12px 0 0;
  max-width:64ch;border-left:2px solid var(--accent-dk);padding-left:12px}
.learn .whatis b{color:var(--ink);font-weight:600}

/* "Your turn", with a box. The blank is a field in the middle of the line
   rather than a sentence underneath saying what to put there. 16px, because
   a smaller field makes a phone zoom the page the moment it is tapped. */
.lgap{font-family:var(--mono,ui-monospace,Menlo,monospace);font-size:16px;color:inherit;
      background:rgba(0,0,0,.22);border:1px solid rgba(110,231,168,.45);border-radius:6px;
      padding:2px 8px;margin:0 2px;min-height:32px;vertical-align:baseline}
.lgap:focus-visible{outline:2px solid #6ee7a8;outline-offset:1px}
.lgap.got{border-color:#6ee7a8;color:#6ee7a8}
.lrow{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:10px}
.lcheck,.lshow{font:inherit;font-size:14px;min-height:44px;padding:0 14px;cursor:pointer;
               border-radius:9px;border:1px solid rgba(255,255,255,.18);
               background:transparent;color:inherit}
.lcheck{border-color:rgba(110,231,168,.5)}
.lmark{font-size:14px;opacity:.85;flex:1 1 220px;min-width:0}
.lmark.hit{color:#6ee7a8;opacity:1}
.lmark.miss{color:#e6bd6d;opacity:1}
/* The door to doing it for real, revealed by getting it right. */
.ldoor{display:inline-block;margin-top:12px;min-height:44px;line-height:44px;
       font-size:15px;color:#6ee7a8;text-decoration:none;
       border-bottom:1px solid rgba(110,231,168,.45)}
.ldoor:hover{border-bottom-color:#6ee7a8}
/* Width comes from `size`, so the code line stays a line. */
.lgap{width:auto;max-width:100%}