/* ==========================================================================
   /learn — interactive tutorial. Built on the site's existing tokens.
   ========================================================================== */

.ln-netline { font-size: 13px; color: var(--text-dim); margin-top: 14px; }

.ln-progress { display: flex; gap: 8px; margin: 0 0 30px; }
.ln-dot {
  width: 30px; height: 30px; border-radius: 50%;
  border: 1px solid var(--line-strong); background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; color: var(--text-faint); transition: all 0.2s;
}
.ln-dot.on { border-color: var(--accent); color: var(--accent); background: rgba(95,255,175,0.08); }

.ln-ch {
  display: none;
  border: 1px solid var(--line-strong); border-radius: var(--radius);
  background: var(--bg-card); padding: 26px 24px; margin-bottom: 20px;
}
.ln-ch.on { display: block; animation: ln-in 0.35s ease; }
@keyframes ln-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.ln-ch-h { font-size: 21px; font-weight: 600; color: var(--text); margin-bottom: 14px; letter-spacing: -0.01em; }
.ln-num { color: var(--accent); font-size: 13px; margin-right: 10px; letter-spacing: 0.08em; }
.ln-ch p { font-size: 14.5px; line-height: 1.75; color: var(--text-dim); margin: 0 0 14px; }
.ln-ch p strong { color: var(--text); }
.ln-ch a { color: var(--accent); }

.ln-keypair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 18px 0; }
@media (max-width: 640px) { .ln-keypair { grid-template-columns: 1fr; } }
.ln-kcard { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; background: var(--bg); }
.ln-kcard p { font-size: 13px; margin: 0; }
.ln-kpub { border-left: 2px solid var(--accent); }
.ln-kpriv { border-left: 2px solid var(--danger); }
.ln-kt { font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 8px; color: var(--text-faint); }
.ln-pubt { color: var(--accent); }
.ln-privt { color: var(--danger); }

.ln-field { margin: 16px 0; }
.ln-field label { display: block; font-size: 12.5px; color: var(--text); margin-bottom: 7px; }
.ln-field input[type="text"], .ln-field textarea {
  display: block; width: 100%; box-sizing: border-box;
  font-family: var(--mono); font-size: 13px; line-height: 1.55;
  color: var(--text); background: var(--bg-alt);
  border: 1px solid var(--line-strong); border-radius: var(--radius);
  padding: 11px 12px; resize: vertical;
}
.ln-field input:focus, .ln-field textarea:focus {
  outline: none; border-color: var(--line-accent); box-shadow: 0 0 0 3px var(--accent-glow);
}

.ln-btn {
  font-family: var(--mono); font-size: 13.5px; font-weight: 600;
  color: var(--bg); background: var(--accent);
  border: 1px solid var(--accent); border-radius: var(--radius);
  padding: 11px 22px; cursor: pointer; margin-top: 6px;
}
.ln-btn:hover { background: #b5ffd7; border-color: #b5ffd7; }
.ln-btn:disabled { opacity: 0.55; cursor: default; }
.ln-btn-alt { color: var(--accent); background: transparent; border-color: var(--line-accent); }
.ln-btn-alt:hover { background: rgba(95,255,175,0.1); color: var(--accent); border-color: var(--accent); }

.ln-out { margin-top: 20px; padding-top: 18px; border-top: 1px dashed var(--line); }
.ln-note { font-size: 13px !important; color: var(--text-faint) !important; line-height: 1.7 !important; }
.ln-note em { color: var(--text-dim); }

.ln-fpr-line { font-size: 13.5px; color: var(--text-dim); margin-bottom: 12px; }
.ln-fpr { color: var(--accent); letter-spacing: 0.08em; word-break: break-all; font-size: 13px; }

.ln-peek { margin: 14px 0; }
.ln-peek summary { cursor: pointer; font-size: 12.5px; color: var(--text-faint); list-style: none; }
.ln-peek summary::before { content: '+ '; color: var(--accent); }
.ln-peek[open] summary::before { content: '\2212  '; }
.ln-peek summary::-webkit-details-marker { display: none; }
.ln-peek-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
@media (max-width: 720px) { .ln-peek-grid { grid-template-columns: 1fr; } }
.ln-peek pre {
  margin: 0; font-size: 9.5px; line-height: 1.35; color: var(--text-faint);
  background: var(--bg-alt); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 10px; max-height: 160px; overflow: auto;
  white-space: pre-wrap; word-break: break-all;
}

.ln-cipher {
  font-size: 11.5px; line-height: 1.5; color: var(--text-dim);
  background: var(--bg-alt); border: 1px solid var(--line-strong);
  border-radius: var(--radius); padding: 14px; margin: 0 0 14px;
  max-height: 240px; overflow: auto; white-space: pre-wrap; word-break: break-all;
}
.ln-plain {
  font-size: 15px; line-height: 1.7; color: var(--accent);
  background: var(--bg-alt); border: 1px solid var(--line-accent);
  border-radius: var(--radius); padding: 16px; margin-bottom: 14px;
}

.ln-verdict {
  font-size: 13.5px; line-height: 1.65; border-radius: var(--radius);
  padding: 13px 16px; margin: 14px 0; border: 1px solid var(--line-strong);
}
.ln-good { color: var(--ok); border-color: var(--line-accent); background: rgba(95,255,175,0.06); }
.ln-bad  { color: var(--danger); border-color: rgba(255,107,107,0.4); background: rgba(255,107,107,0.06); }

.ln-callout {
  font-size: 16px; line-height: 1.6; color: var(--text);
  border-left: 2px solid var(--accent); background: var(--bg-alt);
  border-radius: var(--radius); padding: 16px 18px; margin: 18px 0;
}
.ln-list { margin: 0 0 16px; padding-left: 18px; }
.ln-list li { font-size: 14px; line-height: 1.75; color: var(--text-dim); margin-bottom: 10px; }
.ln-list strong { color: var(--text); }

.ln-done { border-top: 1px solid var(--line); margin-top: 26px; padding-top: 22px; }
.ln-done-h { font-size: 18px; font-weight: 600; color: var(--ok); margin-bottom: 10px; }
.ln-cta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 18px; }
@media (max-width: 640px) { .ln-cta-grid { grid-template-columns: 1fr; } }
.ln-cta {
  display: block; border: 1px solid var(--line-strong); border-radius: var(--radius);
  background: var(--bg); padding: 15px 16px; transition: border-color 0.15s, background 0.15s;
}
.ln-cta:hover { border-color: var(--line-accent); background: var(--bg-card-hov); }
.ln-cta strong { display: block; color: var(--accent); font-size: 14px; margin-bottom: 5px; }
.ln-cta span { display: block; font-size: 12.5px; line-height: 1.6; color: var(--text-faint); }

.ln-foot { font-size: 13px; color: var(--text-faint); line-height: 1.7; margin-top: 24px; }