.lesson-topbar { gap: 14px; }
.lesson-brand { color: var(--text); text-decoration: none; }
.lesson-brand span { color: var(--accent); }
.book-lessons { width: min(1180px, calc(100% - 32px)); margin: 24px auto 48px; }
.lesson-intro { max-width: 760px; margin: 0 auto 20px; text-align: center; }
.lesson-eyebrow { color: var(--accent); font-size: .82rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.lesson-intro h1 { margin: 5px 0 8px; font-size: clamp(1.7rem, 4vw, 2.5rem); }
.lesson-intro p:last-child { color: var(--text-dim); line-height: 1.55; }
.lesson-catalog { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin: 18px 0; }
.lesson-catalog-button { min-height: 92px; padding: 12px; text-align: left; color: var(--text); background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 10px; cursor: pointer; }
.lesson-catalog-button:hover, .lesson-catalog-button:focus-visible { border-color: var(--accent); outline: 2px solid transparent; }
.lesson-catalog-button[aria-current="true"] { border: 2px solid var(--accent); }
.lesson-catalog-title { display: block; margin-bottom: 4px; font-weight: 800; }
.lesson-catalog-meta, .lesson-catalog-state { display: block; color: var(--text-dim); font-size: .83rem; line-height: 1.35; }
.lesson-catalog-state.is-completed { color: #54e28d; font-weight: 800; }
.lesson-workspace { display: grid; grid-template-columns: minmax(300px, 1.05fr) minmax(320px, .95fr); gap: 20px; align-items: start; }
.lesson-board-column { min-width: 0; }
.lesson-status { min-height: 2.6em; margin-bottom: 8px; color: var(--accent); font-weight: 700; line-height: 1.4; }
#lesson-board { max-width: none; }
.lesson-board-stage { display: grid; grid-template-columns: minmax(0, 1fr) 42px; gap: 10px; align-items: stretch; }
.lesson-eval-widget { min-width: 0; display: flex; flex-direction: column; align-items: center; gap: 4px; }
.lesson-eval-widget[hidden] { display: none; }
.lesson-evalbar { position: relative; width: 24px; min-height: 180px; flex: 1; overflow: hidden; background: #171a24; border: 1px solid #687085; border-radius: 5px; }
.lesson-evalbar-white { position: absolute; right: 0; bottom: 0; left: 0; height: 50%; background: #f1f2f5; transition: height .35s ease; }
.lesson-eval-edge { color: var(--text); font-size: .75rem; font-weight: 800; line-height: 1; }
.lesson-eval-label { max-width: 56px; min-height: 1.2em; color: var(--text); font-size: .72rem; font-weight: 800; line-height: 1.2; text-align: center; overflow-wrap: anywhere; }
@media (max-width: 420px) {
  .lesson-board-stage { grid-template-columns: minmax(0, 1fr) 34px; gap: 6px; }
  .lesson-evalbar { width: 20px; min-height: 120px; }
  .lesson-eval-label { max-width: 42px; font-size: .65rem; }
}
.lesson-board-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.lesson-card { min-width: 0; padding: 18px; background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 12px; }
.lesson-source { margin-bottom: 7px; color: var(--text-dim); font-size: .82rem; line-height: 1.45; }
.lesson-source a { color: var(--accent); }
.lesson-card h2 { margin-bottom: 8px; font-size: 1.35rem; }
.lesson-goal { margin-bottom: 14px; line-height: 1.5; }
.lesson-principle { padding: 12px; border: 1px solid var(--panel-edge); border-radius: 8px; }
.lesson-principle legend { padding: 0 5px; color: var(--accent); font-weight: 800; }
.lesson-choices { display: grid; gap: 7px; }
.lesson-choice { width: 100%; padding: 9px 10px; color: var(--text); background: #171a24; border: 1px solid #414863; border-radius: 7px; text-align: left; cursor: pointer; }
.lesson-choice:hover:not(:disabled), .lesson-choice:focus-visible { border-color: var(--accent); outline: 2px solid rgba(240,179,92,.25); }
.lesson-choice:disabled { opacity: .75; cursor: default; }
.lesson-choice.correct { border-color: var(--green); color: #d8ffe0; }
.lesson-choice.incorrect { border-color: var(--red); }
.lesson-feedback { min-height: 1.6em; margin: 10px 0; color: var(--accent); line-height: 1.45; }
.lesson-explanation { padding: 11px; background: rgba(76,217,100,.08); border-left: 3px solid var(--green); border-radius: 5px; line-height: 1.5; }
.lesson-card h3 { margin: 14px 0 5px; font-size: .95rem; }
.lesson-move-list { padding-left: 24px; color: var(--text-dim); font-size: .88rem; line-height: 1.5; }
.lesson-progress, .lesson-note { margin-top: 12px; color: var(--text-dim); font-size: .82rem; line-height: 1.45; }
.lesson-next { margin-top: 12px; }
@media (max-width: 760px) {
  .book-lessons { width: min(100% - 20px, 560px); margin-top: 14px; }
  .lesson-catalog { grid-template-columns: 1fr; gap: 7px; }
  .lesson-catalog-button { min-height: 0; }
  .lesson-workspace { grid-template-columns: 1fr; gap: 12px; }
  .lesson-card { padding: 14px; }
  .lesson-board-actions .btn { flex: 1 1 auto; }
}

.lesson-engine-actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.lesson-engine-analysis { margin-top: 10px; padding: 13px; background: #12141c; border: 1px solid var(--panel-edge); border-radius: 9px; }
.lesson-engine-analysis[hidden] { display: none; }
.lesson-engine-status { color: var(--accent); font-weight: 700; line-height: 1.4; }
.lesson-engine-note { color: var(--text-dim); font-size: .82rem; line-height: 1.45; }
.lesson-engine-lines { display: grid; gap: 8px; max-height: 560px; overflow: auto; padding: 0; list-style: none; }
.lesson-engine-line { padding: 10px; background: #1a1e29; border: 1px solid var(--panel-edge); border-radius: 8px; }
.lesson-engine-line.best { border-color: var(--green); }
.lesson-engine-line-head { display: flex; flex-wrap: wrap; gap: 7px 12px; align-items: baseline; font-weight: 800; }
.lesson-engine-delta { color: var(--text-dim); font-size: .84rem; }
.lesson-engine-facts, .lesson-engine-pv { margin: 6px 0 0; color: var(--text-dim); font-size: .84rem; line-height: 1.45; }
.lesson-engine-preview { margin-top: 8px; padding: 6px 9px; color: var(--text); background: #252b3a; border: 1px solid #414863; border-radius: 6px; cursor: pointer; }
.lesson-engine-preview:hover, .lesson-engine-preview:focus-visible { border-color: var(--accent); outline: 2px solid rgba(240,179,92,.25); }

.lesson-explanation { padding: 13px 14px; line-height: 1.5; }
.lesson-explanation h3 { margin: 0 0 7px; color: var(--green); font-size: 1.02rem; }
.lesson-explanation h4 { margin: 12px 0 5px; color: var(--accent); font-size: .9rem; }
.lesson-explanation p { margin: 0; }
.lesson-explanation ul { margin: 5px 0 0; padding-left: 20px; }
.lesson-explanation li + li { margin-top: 5px; }
.lesson-next-preview { margin: 12px 0 0; padding: 9px 11px; background: rgba(240,179,92,.08); border-left: 3px solid var(--accent); border-radius: 4px; line-height: 1.45; }
.lesson-next-preview[hidden] { display: none; }

.lesson-subtitle { margin: 2px 0 8px; color: var(--accent); font-size: clamp(1rem, 2.5vw, 1.25rem); font-weight: 700; }


/* Green learning mode inherited from the local SupaChess Academy draft. */
.lesson-mode { min-height: 100vh; background: radial-gradient(ellipse at 16% 0%, #263b35 0, #171d1b 38rem, #111513 100%); color: #f2f5f1; }
.lesson-mode .lesson-brand { color: #f5f7f3; }
.lesson-mode .lesson-brand span, .lesson-mode .lesson-eyebrow, .lesson-mode .lesson-subtitle { color: #a9d8a5; }
.lesson-mode .lesson-intro > p:not(.lesson-eyebrow):not(.lesson-subtitle), .lesson-mode .lesson-method-note { color: #c5d0c8; }
.lesson-mode .lesson-method-note { max-width: 820px; margin: 8px auto 0; font-size: .88rem; line-height: 1.55; }
.lesson-mode .lesson-tools { margin: 18px 0 10px; padding: 14px; border: 1px solid #35443b; border-radius: 14px; background: rgba(25,34,29,.96); }
.lesson-mode .lesson-catalog-count { margin: 0 0 10px; color: #d9e2db; font-weight: 700; }
.lesson-mode .lesson-filter-row { display: grid; grid-template-columns: minmax(180px,1fr) minmax(140px,.65fr) minmax(220px,1fr) auto; gap: 9px; align-items: end; }
.lesson-mode .lesson-filter-row label { display: grid; gap: 5px; color: #c5d0c8; font-size: .83rem; font-weight: 700; }
.lesson-mode .lesson-filter-row input, .lesson-mode .lesson-filter-row select { min-height: 40px; padding: 7px 9px; color: #f2f5f1; background: #202b25; border: 1px solid #526159; border-radius: 7px; }
.lesson-mode .lesson-surprise { color: #162117; background: #d4ebc9; border-color: #aed59e; font-weight: 800; }
.lesson-mode .lesson-surprise:hover, .lesson-mode .lesson-surprise:focus-visible { background: #e4f4dd; outline-color: #b9dfa9; }
.lesson-mode .lesson-catalog-button { background: rgba(25,34,29,.96); border-color: #35443b; }
.lesson-mode .lesson-catalog-button:hover, .lesson-mode .lesson-catalog-button:focus-visible { border-color: #9bce95; outline-color: #9bce95; }
.lesson-mode .lesson-catalog-button[aria-current="true"] { border: 2px solid #9bce95; box-shadow: inset 3px 0 #9bce95; }
.lesson-mode .lesson-catalog-button.anticipation-exercise { border-left: 3px solid #9bce95; }
.lesson-mode .lesson-card, .lesson-mode .lesson-engine-analysis { background: rgba(25,34,29,.96); border-color: #35443b; }
.lesson-mode .lesson-choice { background: #202a24; border-color: #405047; }
.lesson-mode .lesson-choice:hover:not(:disabled), .lesson-mode .lesson-choice:focus-visible { border-color: #9bce95; outline-color: #b9dfa9; }
.lesson-mode .lesson-choice.correct { border-color: #9bce95; color: #d8ffe0; }
.lesson-mode .lesson-explanation { background: rgba(76,217,100,.08); border-left-color: #9bce95; }
.lesson-mode .lesson-explanation h3 { color: #b8e3a9; }
.lesson-mode .lesson-status { color: #b8e3a9; }
.lesson-mode .lesson-catalog-empty { padding: 16px; color: #c5d0c8; }
@media (max-width: 900px) {
  .lesson-mode .lesson-filter-row { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .lesson-mode .lesson-filter-row { grid-template-columns: 1fr; }
  .lesson-mode .lesson-surprise { width: 100%; }
}

.lesson-reflection {
  margin: 14px 0;
  padding: 16px;
  border: 1px solid var(--green);
  border-radius: 10px;
  background: #142119;
}
.lesson-reflection[hidden], .lesson-reflection-review[hidden] { display: none; }
.lesson-reflection h3, .lesson-reflection-review h3 { margin: 0 0 8px; color: var(--green); }
.lesson-reflection p, .lesson-reflection-review p { line-height: 1.5; }
.lesson-reflection label { display: block; margin: 12px 0 5px; font-weight: 800; }
.lesson-reflection textarea {
  display: block; width: 100%; min-height: 64px; resize: vertical; padding: 10px;
  color: var(--text); background: #0d1310; border: 1px solid var(--panel-edge); border-radius: 7px;
  font: inherit;
}
.lesson-reflection textarea:focus-visible { outline: 2px solid var(--green); outline-offset: 2px; }
.lesson-reflection-review { margin: 14px 0; padding: 16px; background: #121a15; border: 1px solid var(--green); border-radius: 10px; }
#lesson-review-queue ol { margin: 8px 0; padding-left: 22px; }
#lesson-review-queue li { margin: 6px 0; line-height: 1.45; }
#lesson-reflection-status, #lesson-review-status { font-weight: 700; }


.lesson-card h2.is-completed {
  color: #69e7a1;
}
.lesson-review-panel {
  display:flex; align-items:center; justify-content:space-between; gap:20px;
  margin:14px 0; padding:18px; border:1px solid #56b77b; border-radius:12px;
  color:#edf7ef; background:linear-gradient(115deg,rgba(42,112,68,.34),rgba(19,35,25,.96));
  box-shadow:0 8px 22px rgba(0,0,0,.18);
}
.lesson-review-panel h2 { margin:4px 0 8px; color:#b8e3a9; font-size:1.25rem; }
.lesson-review-panel p { margin:6px 0; line-height:1.5; }
#lesson-review-summary { color:#e2f1e3; font-weight:700; }
.lesson-review-start { flex:0 0 auto; min-height:48px; border-color:#85d697; color:#08150b; background:#9be2a4; font-weight:900; }
.lesson-review-start:hover { background:#b1efb5; }
.lesson-review-start:disabled { opacity:.56; color:#d8e0d8; background:#3b4a3d; cursor:not-allowed; }
@media (max-width:700px) {
  .lesson-review-panel { align-items:stretch; flex-direction:column; }
  .lesson-review-start { width:100%; }
}

.lesson-review-competencies { display:grid; grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr)); gap:10px; margin-top:14px; }
.lesson-review-domain { display:grid; gap:5px; min-height:94px; padding:12px; text-align:left; border:1px solid #527b5c; border-radius:10px; color:#edf7ef; background:#14231a; cursor:pointer; }
.lesson-review-domain:hover,.lesson-review-domain:focus-visible { border-color:#9be2a4; outline:2px solid #9be2a4; outline-offset:2px; }
.lesson-review-domain.is-active { border-color:#9be2a4; background:#24432b; box-shadow:inset 0 0 0 1px #9be2a4; }
.lesson-review-domain-title { color:#b8e3a9; font-weight:800; }
.lesson-review-domain-mastered { font-size:1.05rem; }
.lesson-review-domain small,.lesson-review-domain-filter-status { color:#d8e8da; font-size:.95rem; }
.lesson-review-domain-filter-status { margin-top:8px; }
@media (max-width:700px) { .lesson-review-competencies { grid-template-columns:1fr 1fr; } .lesson-review-domain { min-height:104px; } }
@media (max-width:420px) { .lesson-review-competencies { grid-template-columns:1fr; } }