:root{--hga-ink:#172033;--hga-muted:#657087;--hga-brand:#ef5b2a;--hga-brand-dark:#c83e12;--hga-soft:#fff4ef;--hga-line:#e5e9f0;--hga-success:#157f55;--hga-radius:14px}.hga-course-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:24px;margin:28px 0}.hga-card{border:1px solid var(--hga-line);border-radius:var(--hga-radius);overflow:hidden;background:#fff;box-shadow:0 8px 30px rgba(23,32,51,.07);transition:transform .2s,box-shadow .2s}.hga-card:hover{transform:translateY(-3px);box-shadow:0 14px 38px rgba(23,32,51,.12)}.hga-card-media{display:block;aspect-ratio:16/9;background:linear-gradient(135deg,var(--hga-brand),#ff9c4b);overflow:hidden}.hga-card-media img{width:100%;height:100%;object-fit:cover}.hga-placeholder{height:100%;display:grid;place-items:center;color:#fff;font-size:3rem;font-weight:800}.hga-card-body{padding:22px}.hga-card-body h3{margin:.25rem 0 .6rem}.hga-card-body h3 a,.hga-link{color:var(--hga-ink);text-decoration:none}.hga-eyebrow{color:var(--hga-brand-dark);font-size:.76rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em}.hga-link{font-weight:700}.hga-video{position:relative;padding-top:56.25%;margin:24px 0;border-radius:var(--hga-radius);overflow:hidden;background:#000}.hga-video iframe{position:absolute;inset:0;width:100%;height:100%}.hga-lesson-meta{display:flex;gap:12px;color:var(--hga-muted);font-size:.9rem}.hga-outline{margin:36px 0}.hga-outline ol{list-style:none;padding:0;border:1px solid var(--hga-line);border-radius:var(--hga-radius);overflow:hidden}.hga-outline li+li{border-top:1px solid var(--hga-line)}.hga-outline a{display:grid;grid-template-columns:34px 1fr auto;align-items:center;gap:10px;padding:18px 20px;color:var(--hga-ink);text-decoration:none}.hga-outline li.is-complete span{color:var(--hga-success)}.hga-outline small{color:var(--hga-muted)}.hga-code-lab{margin:28px 0;border-radius:var(--hga-radius);overflow:hidden;background:#131926;color:#f6f7fa;box-shadow:0 14px 40px rgba(10,15,25,.18)}.hga-lab-head,.hga-lab-actions{display:flex;align-items:center;justify-content:space-between;padding:13px 16px;background:#20283a}.hga-language{background:#303a50;color:#fff;border:1px solid #49536a;border-radius:7px;padding:7px 28px 7px 10px}.hga-source,.hga-stdin{box-sizing:border-box;width:100%;border:0;border-radius:0;background:#131926;color:#dbe7ff;font:14px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;padding:18px;resize:vertical}.hga-source{min-height:270px}.hga-code-lab details{border-top:1px solid #30384a}.hga-code-lab summary{padding:10px 16px;cursor:pointer}.hga-lab-actions{justify-content:flex-start;gap:10px}.hga-lab-actions button,.hga-quiz button,.hga-complete{border:0;border-radius:8px;padding:11px 17px;font-weight:750;cursor:pointer}.hga-run,.hga-quiz button,.hga-complete{background:var(--hga-brand);color:#fff}.hga-reset{background:#343e53;color:#fff}.hga-output-wrap{padding:14px 18px}.hga-output-wrap>span{color:#9ca8bd;font-size:.78rem;text-transform:uppercase}.hga-output{white-space:pre-wrap;min-height:48px;margin:7px 0;color:#dff8e9}.hga-output[data-status=error]{color:#ffc7c7}.hga-quiz{margin:38px 0;padding:26px;border:1px solid var(--hga-line);border-radius:var(--hga-radius);background:#fff}.hga-quiz fieldset{border:0;border-bottom:1px solid var(--hga-line);margin:0 0 24px;padding:0 0 22px}.hga-quiz legend{font-weight:750;margin-bottom:12px}.hga-quiz label{display:block;margin:8px 0;padding:10px 12px;border-radius:8px;background:#f6f8fb}.hga-feedback{display:none;margin:10px 0 0;font-weight:650}.hga-quiz fieldset.is-correct .hga-feedback{display:block;color:var(--hga-success)}.hga-quiz fieldset.is-wrong .hga-feedback{display:block;color:#b3261e}.hga-quiz-result{display:flex;align-items:center;gap:12px;margin-top:18px}.hga-quiz-result strong{font-size:1.8rem}.hga-progress-action{text-align:right;margin:30px 0}.hga-complete.is-complete{background:var(--hga-success)}.hga-lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:35px 0}.hga-lesson-nav a{display:flex;flex-direction:column;border:1px solid var(--hga-line);border-radius:10px;padding:16px;color:var(--hga-ink);text-decoration:none}.hga-lesson-nav .next{text-align:right}.hga-lesson-nav small{color:var(--hga-muted)}.hga-notice{padding:18px;border-radius:10px;background:var(--hga-soft);border-left:4px solid var(--hga-brand)}.hga-dashboard{display:flex;gap:20px;margin:25px 0}.hga-stat{display:flex;flex-direction:column;padding:22px 26px;border:1px solid var(--hga-line);border-radius:var(--hga-radius)}.hga-stat strong{font-size:2rem;color:var(--hga-brand)}.hga-completed{list-style:none;padding:0}.hga-completed li{padding:8px 0;color:var(--hga-success)}@media(max-width:600px){.hga-lesson-nav{grid-template-columns:1fr}.hga-source{min-height:220px}.hga-quiz{padding:18px}.hga-outline a{grid-template-columns:28px 1fr}.hga-outline small{display:none}}