/* =====================================================================
   TalentedHub — Learning section (hub + lessons + Try it Yourself)
   ===================================================================== */

/* ---- Hub ---- */
.learn-hub-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--gap); margin-bottom: 24px; }
.learn-course-card { display: flex; flex-direction: column; gap: 10px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow-sm);
  transition: transform .25s, box-shadow .25s; }
.learn-course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.learn-course-badge { width: 60px; height: 60px; border-radius: 16px; display: grid; place-items: center;
  color: #fff; font-family: var(--font-head); font-weight: 800; font-size: 1.3rem; margin-bottom: 6px; }
.learn-course-card h3 { font-size: 1.3rem; }
.learn-course-card p { color: var(--text-soft); font-size: .96rem; flex: 1; }
.learn-meta { color: var(--text-faint); font-size: .85rem; font-weight: 600; }
.learn-course-card .link-more { color: var(--accent); font-weight: 700; font-size: .92rem; }

/* ---- Top course bar (lesson view) ---- */
.learn-topbar { background: var(--surface); border-bottom: 1px solid var(--border);
  position: sticky; top: 70px; z-index: 30; }
.learn-topbar-inner { display: flex; align-items: center; gap: 10px; padding: 10px 22px; overflow-x: auto; }
.learn-topbar-label { font-size: .82rem; font-weight: 700; color: var(--text-faint); white-space: nowrap; }
.learn-tab { display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; font-weight: 600;
  font-size: .92rem; color: var(--text-soft); padding: 8px 16px; border-radius: var(--radius-pill);
  border: 1px solid var(--border); transition: all .2s; }
.learn-tab:hover { color: var(--text); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.learn-tab-dot { width: 12px; height: 12px; border-radius: 4px; background: linear-gradient(135deg, var(--tab1, #6d4aff), var(--tab2, #9a5cff)); }
.learn-tab.active { color: #fff; border-color: transparent; background: linear-gradient(135deg, var(--tab1, #6d4aff), var(--tab2, #9a5cff)); }
.learn-tab.active .learn-tab-dot { background: rgba(255,255,255,.85); }
.learn-tab-more { white-space: nowrap; font-size: .88rem; font-weight: 600; color: var(--accent); padding: 8px 6px; margin-left: auto; }
[data-theme="dark"] .learn-tab-more { color: var(--accent-2); }

/* ---- Lesson layout: sidebar | content | rail ---- */
.learn-layout { display: grid; grid-template-columns: 250px minmax(0,1fr) 300px; gap: 30px; align-items: start; padding: 26px 22px 60px; }

.learn-sidebar { position: sticky; top: 132px; align-self: start; max-height: calc(100vh - 156px); overflow-y: auto;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow-sm); }
.learn-back { display: inline-block; color: var(--text-faint); font-size: .85rem; font-weight: 600; margin-bottom: 12px; }
.learn-back:hover { color: var(--accent); }
.learn-course-title { display: flex; align-items: center; gap: 9px; font-family: var(--font-head); font-weight: 800; font-size: 1.05rem; padding: 0 6px 12px; border-bottom: 1px solid var(--border); margin-bottom: 8px; }
.learn-dot { width: 18px; height: 18px; border-radius: 6px; flex-shrink: 0; }
.learn-lessons { display: flex; flex-direction: column; gap: 1px; }
.learn-lessons a { display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: var(--radius-sm);
  font-size: .92rem; color: var(--text-soft); transition: background .15s, color .15s; }
.learn-lessons a:hover { background: var(--surface-2); color: var(--text); }
.learn-lessons a.active { background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent); font-weight: 600; }
[data-theme="dark"] .learn-lessons a.active { background: color-mix(in srgb, var(--accent) 26%, transparent); color: #fff; }
.ln-num { width: 22px; height: 22px; flex-shrink: 0; border-radius: 6px; background: var(--surface-2);
  display: grid; place-items: center; font-size: .72rem; font-weight: 700; color: var(--text-faint); }
.learn-lessons a.active .ln-num { background: var(--accent); color: #fff; }

/* ---- Lesson content ---- */
.learn-content { min-width: 0; }
.learn-content .crumbs { font-size: .85rem; color: var(--text-faint); display: flex; gap: 8px; margin-bottom: 14px; }
.learn-content .crumbs a:hover { color: var(--accent); }
.learn-body { font-size: 1.05rem; line-height: 1.75; }
.learn-body h2 { font-size: 1.7rem; font-weight: 800; margin: 0 0 14px; }
.learn-body h3 { font-size: 1.2rem; font-weight: 700; margin: 22px 0 8px; }
.learn-body p { color: var(--text); margin-bottom: 13px; }
.learn-body ul { list-style: disc; padding-left: 1.4em; margin-bottom: 14px; }
.learn-body li { margin: 5px 0; color: var(--text-soft); }
.learn-body code { background: var(--surface-2); padding: 2px 7px; border-radius: 6px; font-size: .9em;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; color: var(--accent); }
[data-theme="dark"] .learn-body code { color: #b9a6ff; }
.learn-body pre { background: #1e2030; color: #e7e8f0; border-radius: var(--radius-sm); padding: 16px 18px;
  overflow-x: auto; font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .92rem; line-height: 1.6; margin: 0 0 16px; }
.learn-body pre code { background: none; color: inherit; padding: 0; }
.learn-body .def { background: color-mix(in srgb, var(--accent) 8%, var(--surface)); border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 12px 16px; margin: 0 0 18px; color: var(--text); }
[data-theme="dark"] .learn-body .def { background: color-mix(in srgb, var(--accent) 18%, var(--surface)); }
.learn-body table { width: 100%; border-collapse: collapse; margin: 0 0 16px; font-size: .95rem; }
.learn-body table td { border: 1px solid var(--border); padding: 7px 12px; color: var(--text-soft); }
.learn-body table td code { background: var(--surface-2); }

/* ---- Try it Yourself ---- */
.tryit { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; margin: 24px 0; box-shadow: var(--shadow-sm); }
.tryit-head { display: flex; align-items: center; justify-content: space-between; padding: 11px 16px;
  background: var(--surface-2); border-bottom: 1px solid var(--border); font-weight: 700; font-size: .92rem; }
.tryit-run { background: var(--accent-grad); color: #fff; font-weight: 700; font-size: .85rem; padding: 7px 16px;
  border-radius: var(--radius-pill); cursor: pointer; transition: transform .15s, box-shadow .2s; }
.tryit-run:hover { box-shadow: 0 4px 14px rgba(109,74,255,.4); }
.tryit-run:active { transform: translateY(1px); }
.tryit-code { width: 100%; min-height: 150px; border: none; padding: 16px 18px; resize: vertical;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .95rem; line-height: 1.6;
  background: #1e2030; color: #e7e8f0; outline: none; display: block; tab-size: 4; }
.tryit-output-wrap { border-top: 1px solid var(--border); background: var(--surface); }
.tryit-label { font-size: .72rem; text-transform: uppercase; letter-spacing: .05em; color: var(--text-faint);
  font-weight: 700; padding: 10px 18px 0; }
.tryit-output { margin: 0; padding: 8px 18px 16px; font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: .92rem; line-height: 1.55; color: var(--text); white-space: pre-wrap; min-height: 1.5em; }
.tryit-output.err { color: var(--red, #dc2626); }
/* HTML live preview */
.tryit-output.frame { padding: 0; }
.tryit-frame { display: block; width: 100%; min-height: 240px; border: 0; background: #fff;
  border-radius: 0 0 var(--radius) var(--radius); }
/* SQL result tables inside the output */
.tryit-output .sql-result { border-collapse: collapse; width: 100%; margin: 2px 0 8px; font-family: var(--font-body, sans-serif); font-size: .9rem; }
.tryit-output .sql-result th { background: var(--surface-2); text-align: left; padding: 7px 12px; border: 1px solid var(--border); font-weight: 700; color: var(--text); white-space: nowrap; }
.tryit-output .sql-result td { padding: 6px 12px; border: 1px solid var(--border); color: var(--text-soft); }
.tryit-output .sql-result tbody tr:nth-child(even) { background: color-mix(in srgb, var(--surface-2) 50%, transparent); }
.tryit-output .sql-count { font-size: .82rem; font-weight: 600; color: var(--text-faint); margin-bottom: 4px; }
/* Python plot images + mixed text/plot output */
.tryit-output .py-text { white-space: pre-wrap; margin-bottom: 8px; }
.tryit-output .py-plot { display: block; max-width: 100%; height: auto; border-radius: var(--radius-sm);
  background: #fff; padding: 6px; border: 1px solid var(--border); margin: 6px 0; }

/* ---- Prompt Engineering example boxes ---- */
.learn-body .pe-bad, .learn-body .pe-good, .learn-body .pe-prompt {
  border-radius: var(--radius-sm); padding: 12px 15px; margin: 0 0 14px; border-left: 4px solid var(--border); }
.learn-body .pe-bad { background: color-mix(in srgb, #dc2626 7%, var(--surface)); border-left-color: #dc2626; }
.learn-body .pe-good { background: color-mix(in srgb, #059669 9%, var(--surface)); border-left-color: #059669; }
.learn-body .pe-prompt { background: var(--surface-2); border-left-color: var(--accent); }
.learn-body .pe-label { display: block; font-size: .7rem; text-transform: uppercase; letter-spacing: .06em;
  font-weight: 800; margin-bottom: 5px; }
.learn-body .pe-bad .pe-label { color: #dc2626; }
.learn-body .pe-good .pe-label { color: #059669; }
.learn-body .pe-prompt .pe-label { color: var(--accent); }
[data-theme="dark"] .learn-body .pe-prompt .pe-label { color: var(--accent-2); }
.learn-body .pe-bad p, .learn-body .pe-good p, .learn-body .pe-prompt p { margin: 0; color: var(--text); font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: .92rem; }
.learn-body .ai-out { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 12px 15px; margin: 0 0 16px; font-size: .96rem; }
.learn-body .ai-out::before { content: "🤖 Example AI response"; display: block; font-size: .7rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: .06em; color: var(--text-faint); margin-bottom: 7px; }
.learn-body .ai-out p { margin: 0 0 6px; color: var(--text-soft); }

/* ---- Prev / next ---- */
.learn-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 26px; }
.learn-nav .btn { max-width: 48%; }

.learn-rail { position: sticky; top: 132px; }

@media (max-width: 1000px) {
  .learn-layout { grid-template-columns: 1fr; }
  .learn-rail { display: none; }
  .learn-sidebar { position: static; max-height: 320px; }
}
@media (max-width: 600px) {
  .learn-hub-grid { grid-template-columns: 1fr; }
  .learn-nav { flex-direction: column; }
  .learn-nav .btn { max-width: none; }
}

/* "Last updated" freshness line (GEO/SEO signal) */
.lesson-updated { font-size: .82rem; color: var(--text-faint); margin: 0 0 14px; }
.lesson-updated time { font-weight: 600; }

/* ---- Progress tracking ---- */
.course-progress { margin: 4px 6px 12px; }
.cp-track { height: 7px; border-radius: 99px; background: var(--surface-2); overflow: hidden; }
.cp-fill { height: 100%; width: 0; border-radius: 99px; background: var(--accent-grad); transition: width .5s ease; }
.cp-text { display: block; font-size: .76rem; font-weight: 600; color: var(--text-faint); margin-top: 5px; }
.course-progress.cp-complete .cp-fill { background: linear-gradient(135deg, #16a34a, #22c55e); }
.card-progress { margin: 4px 0 0; }
.learn-lessons a.done .ln-num { background: #16a34a; color: #fff; }
.learn-lessons a.done .ln-num::after { content: "✓"; }
.learn-lessons a.done .ln-num { font-size: 0; }
.learn-lessons a.done .ln-num::after { font-size: .72rem; }
.learn-quiz-link { display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: var(--radius-sm);
  font-size: .92rem; font-weight: 600; color: var(--text-soft); margin-top: 4px; border-top: 1px solid var(--border); }
.learn-quiz-link:hover { background: var(--surface-2); color: var(--text); }
.learn-quiz-link.active { background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent); }
.learn-quiz-link .ln-num { background: linear-gradient(135deg, #f59e0b, #f97316); color: #fff; }

/* ---- Quiz ---- */
.quiz-head { margin-bottom: 22px; }
.quiz-head h1 { font-size: 1.7rem; font-weight: 800; margin: 10px 0 6px; }
.quiz-head p { color: var(--text-soft); }
.quiz-q { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px 22px; margin-bottom: 16px; box-shadow: var(--shadow-sm); }
.quiz-question { display: flex; gap: 12px; align-items: flex-start; font-weight: 600; font-size: 1.08rem; margin: 0 0 14px; }
.quiz-num { flex-shrink: 0; width: 26px; height: 26px; border-radius: 8px; background: var(--surface-2);
  display: grid; place-items: center; font-size: .8rem; font-weight: 800; color: var(--text-faint); }
.quiz-opts { display: grid; gap: 9px; }
.quiz-opt { text-align: left; padding: 12px 16px; border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text); font-size: .96rem; font-weight: 500; transition: all .15s; }
.quiz-opt:hover:not(:disabled) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 6%, var(--surface)); }
.quiz-opt:disabled { cursor: default; }
.quiz-opt.correct { border-color: #16a34a; background: color-mix(in srgb, #16a34a 14%, var(--surface)); color: var(--text); font-weight: 700; }
.quiz-opt.correct::after { content: " ✓"; color: #16a34a; }
.quiz-opt.wrong { border-color: #dc2626; background: color-mix(in srgb, #dc2626 12%, var(--surface)); }
.quiz-opt.wrong::after { content: " ✕"; color: #dc2626; }
.quiz-result { text-align: center; padding: 26px; border-radius: var(--radius); margin: 6px 0 18px; border: 1px solid var(--border); }
.quiz-result.pass { background: color-mix(in srgb, #16a34a 10%, var(--surface)); border-color: #16a34a; }
.quiz-result.fail { background: color-mix(in srgb, #f59e0b 10%, var(--surface)); border-color: #f59e0b; }
.qr-score { font-family: var(--font-head); font-size: 2.4rem; font-weight: 800; }
.qr-msg { color: var(--text-soft); margin: 4px 0 0; }