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b{text-decoration:none;color:var(--ink)}.tone-coral .hx-step-dot{background:color-mix(in srgb,var(--hx-wrong) 22%,var(--surface));color:var(--danger)}.dc-units{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:22px 6px 0}.dc-unit{--tone:var(--hx-math);--tone-soft:var(--hx-math-soft);--tone-ink:var(--hx-math-ink);position:relative;background:var(--surface);border:1px solid var(--border);border-top:4px solid var(--tone);border-radius:12px;box-shadow:var(--glass-shadow);padding:16px 18px 10px;animation:sp-rise .4s var(--ease-standard) both}.dc-lesson-head.tone-purple,.dc-unit.tone-purple{--tone:var(--hx-rw);--tone-soft:var(--hx-rw-soft);--tone-ink:var(--hx-rw-ink)}.dc-lesson-head.tone-green,.dc-unit.tone-green{--tone:var(--hx-right);--tone-soft:var(--good-soft);--tone-ink:var(--good)}.dc-lesson-head.tone-coral,.dc-unit.tone-coral{--tone:var(--hx-wrong);--tone-soft:color-mix(in srgb, var(--hx-wrong) 20%, 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.dc-dot{border-color:var(--tone);box-shadow:0 0 0 4px color-mix(in srgb,var(--tone) 18%,transparent)}.dc-lesson-row.done .dc-dot{background:var(--tone);border-color:var(--tone);color:#fff}.dc-dot .hx-step-check{width:15px;height:15px}.dc-lesson-text{min-width:0}.dc-lesson-text b{display:block;font-size:14.5px;font-weight:650}.dc-lesson-text span{font-size:12.5px;color:var(--muted)}.dc-lesson-meta{font-size:12px;color:var(--muted);white-space:nowrap}.dc-go{font-size:12.5px;font-weight:650;padding:6px 13px;border-radius:999px;border:1px solid var(--border-strong);white-space:nowrap}.dc-go.primary{background:var(--solid);color:var(--on-solid);border-color:var(--solid)}.dc-lesson-head{--tone:var(--hx-math);--tone-soft:var(--hx-math-soft);--tone-ink:var(--hx-math-ink);display:flex;align-items:center;gap:16px;padding:18px 22px;border-radius:12px;background:var(--hx-sky);color:var(--hx-sky-ink)}.dc-lesson-title{flex:1;min-width:0}.dc-lesson-title 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