.lessen{padding-top:calc(var(--nav-height) + 18px)}.lessen-hero{padding:34px 0 10px}.lessen-kicker{letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted);margin:0 0 10px;font-size:12px;font-weight:900}.lessen-title{font-family:var(--font-display);letter-spacing:-.03em;color:var(--text);margin:0;font-size:clamp(2.2rem,5vw,3.2rem)}.lessen-sub{max-width:64ch;color:var(--text-muted);margin:12px 0 0;line-height:1.7}.lessen-head{justify-content:space-between;align-items:flex-end;gap:18px;display:flex}.lessen-divider{background:var(--border);height:1px;margin-top:22px}.instrument-tabs{border:1px solid var(--border);box-shadow:var(--shadow-sm);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffc7;border-radius:999px;gap:6px;padding:6px;display:inline-flex}.instrument-tab{cursor:pointer;height:38px;font-family:var(--font-body);letter-spacing:.06em;text-transform:uppercase;color:var(--text);background:0 0;border:0;border-radius:999px;padding:0 14px;font-size:12px;font-weight:800;transition:background-color .2s,transform .12s,color .2s}.instrument-tab:hover{color:var(--accent);background:#2f7ea614;transform:translateY(-1px)}.instrument-tab.is-active{background:var(--primary);color:var(--primary-ink);box-shadow:0 10px 22px #00000014}.instrument-tab.is-active:hover{background:var(--primary-hover);color:var(--primary-ink)}.lessen-content{padding:30px 0 10px}.lesson-section{margin:0 0 40px}.lesson-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:center;gap:24px;display:grid}.lesson-section.is-flipped .lesson-image{order:2}.lesson-section.is-flipped .lesson-text{order:1}.lesson-image{border-radius:var(--radius-lg);border:1px solid var(--border);box-shadow:var(--shadow-sm);aspect-ratio:16/10;background:#ffffffb3;overflow:hidden}.lesson-image img{object-fit:cover;width:100%;height:100%;display:block}.lesson-text{padding:10px 0}.section-title{font-family:var(--font-display);letter-spacing:-.02em;color:var(--text);margin:0 0 12px;font-size:clamp(1.5rem,3vw,2rem)}.section-content{color:var(--text);max-width:68ch;margin:0 0 12px;line-height:1.75}.trial{padding:32px 0 70px}.trial-grid{grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);align-items:start;gap:22px;display:grid}.trial-card{border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffd9;overflow:hidden}.trial-head{border-bottom:1px solid var(--border);background:radial-gradient(900px 420px at 10% 0,#ea5a4f1a,#0000 60%),radial-gradient(900px 420px at 90% 0,#2f7ea61a,#0000 55%),#ffffffbf;padding:18px 18px 14px}.trial-head h2{font-family:var(--font-display);letter-spacing:-.02em;margin:0;font-size:22px}.trial-head p{color:var(--text-muted);margin:6px 0 0;font-size:13px}.trial-form{gap:12px;padding:16px 18px 18px;display:grid}.trial-form label span{color:var(--text);margin-bottom:6px;font-size:12px;font-weight:800;display:block}.trial-submit{background:var(--primary);width:100%;color:var(--primary-ink);justify-content:center;padding:12px 16px;box-shadow:0 12px 26px #ea5a4f29}.trial-submit:hover{background:var(--primary-hover)}.trial-note{color:var(--text-muted);margin:8px 10px 5px;font-size:12px}.info-card{border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffc7;padding:18px}.info-card h2{font-family:var(--font-display);letter-spacing:-.02em;margin:0 0 10px;font-size:22px}.info-card p{color:var(--text);margin:0 0 14px;line-height:1.7}@media (max-width:980px){.lessen-head{flex-direction:column;align-items:flex-start}.lesson-grid{grid-template-columns:1fr}.lesson-section.is-flipped .lesson-image,.lesson-section.is-flipped .lesson-text{order:initial}.trial-grid{grid-template-columns:1fr}}@media (max-width:520px){.instrument-tabs{justify-content:space-between;width:100%}.instrument-tab{text-align:center;flex:1;padding:0 10px}}.trial-form-scope .hero-form{margin-top:0}.trial-form-scope .hero-form-note{display:none}