/* The course stays within the portal's existing visual system. */
.learn { --learn-muted: #b5b0a7; }
.learn h1 { font-size: clamp(2rem,5vw,3.35rem); letter-spacing: -.04em; line-height: 1.12; margin: 12px 0 18px; overflow-wrap: anywhere; }
.learn h2 { font-size: clamp(1.3rem,3vw,1.7rem); line-height: 1.25; letter-spacing: -.025em; margin: 0 0 16px; }
.learn h3 { line-height: 1.35; margin: 0 0 10px; }
.learn p { margin: 0 0 16px; }
.learn ul { padding-left: 22px; }
.learn li { margin: 8px 0; }
.learn a { text-underline-offset: 4px; }
.learn a:hover { color: var(--accent); }
.learn .btn-accent:hover { color: var(--accent-ink); }
.learn :is(a,button,input,select,textarea):focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.learn-hero { padding: 30px 0 40px; }
.learn-lead { max-width: 760px; color: #d7d2c9; font-size: 1.12rem; line-height: 1.7; }
.learn-facts { display: flex; flex-wrap: wrap; gap: 12px 30px; margin: 26px 0; color: var(--learn-muted); }
.learn-facts strong { font: 700 1.55rem var(--mono); color: var(--text); }
.learn-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 20px; }
.learn-panel { border: 1px solid var(--border); border-radius: 22px; padding: 28px; background: var(--card); margin: 0 0 32px; min-width: 0; }
.learn-panel-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: start; gap: 16px; }
.learn-muted, .learn-storage { color: var(--learn-muted); font-size: .9rem; }
.learn-pace { display: flex; gap: 8px; align-items: center; font-size: .9rem; }
.learn select { font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border-hover); border-radius: 8px; padding: 6px 10px; }
.learn progress { display: block; width: 100%; height: 8px; margin: 16px 0; appearance: none; border: none; border-radius: 99px; background: #3b3935; }
.learn progress::-webkit-progress-bar { background: #3b3935; border-radius: 99px; }
.learn progress::-webkit-progress-value { background: var(--accent); border-radius: 99px; }
.learn progress::-moz-progress-bar { background: var(--accent); border-radius: 99px; }
.learn-import { position: relative; overflow: hidden; }
.learn-import input { position: absolute; opacity: 0; inset: 0; width: 100%; cursor: pointer; }
.learn-import:focus-within { outline: 3px solid var(--accent); outline-offset: 4px; }
.learn-grid { display: grid; gap: 24px; }
.learn-three { grid-template-columns: repeat(3,minmax(0,1fr)); }
.learn-method { margin: 40px 0; }
.learn-method p { color: #d7d2c9; margin-top: 10px; }
.learn-number { font: .78rem var(--mono); color: var(--accent); letter-spacing: .08em; }
.learn-notice { border-left: 3px solid var(--accent); background: var(--accent-dim); padding: 16px 20px; border-radius: 0 12px 12px 0; }
.learn-phase { display: flex; align-items: baseline; gap: 16px; margin: 30px 0 16px; }
.learn-phase h3 { font-size: 1.25rem; }
.learn-module { display: grid; grid-template-columns: 42px minmax(0,1fr) auto; gap: 20px; align-items: center; border: 1px solid var(--border); padding: 24px; border-radius: 18px; margin: 12px 0; background: var(--card-2); }
.learn-module.is-complete { border-color: #2b7852; }
.learn-module-number { align-self: start; padding-top: 7px; font: 1.45rem var(--mono); color: var(--accent); }
.learn-module h3 { font-size: 1.12rem; margin-top: 10px; }
.learn-module h3 a { text-decoration: none; }
.learn-module p { color: #c8c2b8; margin: 0 0 8px; }
.learn-module p:last-child { margin-bottom: 0; }
.learn-module-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; color: var(--learn-muted); font-size: .78rem; }
.learn-badge { display: inline-block; padding: 3px 9px; border: 1px solid var(--border-hover); border-radius: 99px; color: var(--learn-muted); font-size: .75rem; }
.learn-badge.is-complete { color: var(--accent); border-color: #2b7852; }
.learn-architecture { margin-top: 40px; }
.learn-flow { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin: 24px 0; }
.learn-flow span { background: var(--bg); border: 1px solid var(--border-hover); border-radius: 12px; padding: 16px; text-align: center; font-family: var(--mono); font-size: .85rem; }
.learn-flow b { color: var(--accent); }
.learn-downloads { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 12px; margin: 24px 0; }
.learn-downloads a { display: block; padding: 14px 18px; border: 1px solid var(--border); border-radius: 12px; text-decoration: none; background: var(--card); }
.learn-review-date { margin: 30px 0 !important; }
.learn-storage { margin-top: 32px !important; padding-top: 18px; border-top: 1px solid var(--border); }
.learn-lesson-head { margin: 12px 0 30px; }
.learn-toc { display: flex; flex-wrap: wrap; gap: 10px 22px; padding-top: 12px; border-top: 1px solid var(--border); font-size: .9rem; }
.learn-prose { max-width: 800px; }
.learn-prose section { margin: 36px 0 44px; scroll-margin-top: 24px; }
.learn-prose p { color: #ddd7ce; line-height: 1.8; }
.learn .chip { white-space: normal; overflow-wrap: anywhere; }
.learn pre { white-space: pre; overflow-x: auto; max-width: 100%; padding: 20px; color: #c8f9df; background: #131712; border: 1px solid #2b4535; border-radius: 12px; font-size: .85rem; line-height: 1.7; tab-size: 2; }
.learn-code-head { font: .75rem var(--mono); color: var(--learn-muted); margin-bottom: -6px; }
.learn-steps { padding-left: 24px; }
.learn-steps > li { padding-left: 8px; margin: 24px 0; }
.learn-steps li::marker { color: var(--accent); font-weight: 700; }
.learn-checks { display: grid; gap: 10px; margin: 20px 0 26px; }
.learn-checks label { display: flex; align-items: start; gap: 12px; padding: 14px; border: 1px solid var(--border); border-radius: 10px; cursor: pointer; }
.learn input[type=checkbox], .learn input[type=radio] { accent-color: var(--accent); width: 19px; height: 19px; flex: 0 0 19px; margin: 3px 0 0; }
.learn-checks label:has(input:checked) { border-color: #2b7852; background: var(--accent-dim); }
.learn-notes-label { display: block; margin: 24px 0 10px; font-weight: 600; }
.learn textarea { display: block; width: 100%; background: var(--bg); border: 1px solid var(--border-hover); border-radius: 12px; color: var(--text); padding: 14px; font: inherit; resize: vertical; margin-bottom: 8px; }
.learn-bottom-nav { display: flex; justify-content: space-between; gap: 32px; padding-top: 24px; border-top: 1px solid var(--border); }
.learn-bottom-nav a { max-width: 45%; }
.learn-sources { margin: 36px 0; }
.learn-question { min-width: 0; border: 1px solid var(--border); border-radius: 18px; padding: 24px; margin: 30px 0; background: var(--card); }
.learn-question legend { display: table; width: 100%; max-width: 100%; padding: 12px 0 0; font-size: 1.12rem; font-weight: 650; line-height: 1.5; overflow-wrap: anywhere; }
.learn-question legend .learn-number { display: block; margin-bottom: 10px; font-weight: 400; }
.learn-choices { display: grid; gap: 10px; margin-top: 16px; }
.learn-choices label { display: flex; gap: 12px; align-items: start; background: var(--card-2); border: 1px solid var(--border); border-radius: 12px; padding: 16px; cursor: pointer; }
.learn-choice-key { font-family: var(--mono); color: var(--learn-muted); }
.learn-choices label:has(input:checked) { background: var(--accent-dim); border-color: var(--accent); }
.learn-choices label:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }
.learn-submit { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; position: sticky; bottom: 0; padding: 18px; background: #211f1cf5; border: 1px solid var(--border); border-radius: 14px; }
.learn-review { margin: 20px 0; border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 14px; padding: 24px; background: var(--card); }
.learn-review.is-wrong { border-left-color: var(--bad); }
.learn-review.is-wrong .learn-number { color: var(--bad); }
.learn-review h3 { margin: 12px 0; }
.learn-breakdown { display: grid; gap: 12px; }
.learn-breakdown a { display: flex; justify-content: space-between; gap: 16px; text-decoration: none; border-bottom: 1px solid var(--border); padding-bottom: 10px; }
.learn-breakdown strong { white-space: nowrap; color: var(--accent); }
@media(max-width:720px) {
  .topbar { flex-wrap: wrap; }
  .topbar nav { flex-wrap: wrap; gap: 16px; }
  .learn-hero { padding-top: 20px; }
  .learn-panel { padding: 20px; }
  .learn-three, .learn-downloads { grid-template-columns: minmax(0,1fr); }
  .learn-module { grid-template-columns: 32px minmax(0,1fr); gap: 12px; padding: 18px; }
  .learn-module > .btn { grid-column: 2; justify-self: start; }
  .learn-flow { flex-direction: column; align-items: stretch; }
  .learn-flow b { text-align: center; transform: rotate(90deg); }
  .learn-phase { align-items: start; flex-direction: column; gap: 8px; }
  .learn-bottom-nav { flex-direction: column; gap: 16px; }
  .learn-bottom-nav a { max-width: 100%; }
  .learn-question { padding: 18px 14px; }
  .learn-choices label { padding: 12px; gap: 9px; }
  .learn-question legend { font-size: 1rem; }
  .learn-facts { gap: 10px 20px; }
}

/* Beginner lesson: definitions and visible results for each command. */
.learn-terms { margin:24px 0; }
.learn-terms > div { padding:16px 0; border-bottom:1px solid var(--border); }
.learn-terms dt { font-weight:700; color:var(--text); margin-bottom:6px; }
.learn-terms dd { margin:0; line-height:1.7; }
.learn-example { margin:24px 0; padding:20px; border-left:3px solid var(--accent); background:var(--card); border-radius:0 12px 12px 0; }
.learn-example h3 { margin-top:0; }
.learn-expected { padding:12px 16px; border-left:3px solid var(--accent); background:var(--accent-dim); border-radius:0 8px 8px 0; }
.learn-help { margin:12px 0 24px; }
.learn-help summary { cursor:pointer; color:var(--learn-muted); }
.learn-help p { padding-left:12px; border-left:1px solid var(--border); }
.learn-start .btn { white-space:normal; }

.learn-abbreviations summary{cursor:pointer;font-weight:700;line-height:1.5}.learn-terms dd{overflow-wrap:anywhere}.learn-steps li{overflow-wrap:anywhere}