body{--accent:var(--bio);--soft:var(--bio-soft)}
.bio-course{max-width:1160px}.course-head{display:flex;justify-content:space-between;gap:24px;align-items:end;margin:28px 0 22px}.course-head h1{margin:2px 0 8px}.course-head p{max-width:690px}.course-head .eyebrow{font-weight:800;color:var(--accent);font-size:12px;letter-spacing:.08em;text-transform:uppercase}.course-actions{display:flex;gap:8px;flex:none}.course-layout{display:grid;grid-template-columns:290px minmax(0,1fr);gap:18px;align-items:start}.course-nav{max-height:calc(100vh - 100px);overflow:auto;position:sticky;top:72px;padding:16px}.course-nav h2{font-size:14px;line-height:1.3;margin:14px 0 8px}.course-nav .nav-group:first-child h2{margin-top:0}.course-nav a{display:block;color:var(--ink);font-size:13px;line-height:1.3;padding:7px 10px;border-radius:8px;text-decoration:none}.course-nav a:hover,.course-nav a[aria-current]{background:var(--soft);color:var(--accent);font-weight:700}.course-article{padding:32px;min-height:560px}.lesson-count{font-family:var(--mono);font-size:12px;color:var(--accent);font-weight:700}.course-article h2{font-size:clamp(27px,4vw,42px);margin:8px 0 20px}.lesson-note{font-size:clamp(18px,2.2vw,23px);line-height:1.65;max-width:650px}.term-list{margin:30px 0}.term-caption{font-size:13px;color:var(--muted);font-weight:700}.vocab{border-radius:10px;padding:10px 14px;margin:8px 0;border:1px solid}.vocab.new{background:#e9f7f3;border-color:#8bcfc0}.vocab.old{background:#eef2fb;border-color:#b6c8e6}.vocab summary{cursor:pointer;font-size:17px;font-weight:800}.vocab summary span{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;margin-left:8px}.vocab.new summary{color:#076554}.vocab.old summary{color:#365b95}.vocab p{margin:10px 0 2px}.vocab small{display:block;color:var(--muted)}.lesson-try{background:#f6f8f7;border-radius:12px;padding:18px 20px;margin:28px 0}.lesson-try h3{margin:0 0 8px}.lesson-next{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:28px}
@media(max-width:760px){.course-head{display:block}.course-actions{margin-top:16px}.course-layout{display:flex;flex-direction:column}.course-nav{position:static;width:100%;max-height:220px}.course-article{width:100%;padding:22px;min-height:0}.course-article h2{font-size:29px}.lesson-note{font-size:19px}}
@media print{.topbar,.course-head,.course-nav,.lesson-next,.lesson-try .btn{display:none!important}.course-layout{display:block}.course-article{box-shadow:none;border:0;padding:0;min-height:0}.vocab{break-inside:avoid}}
.plan-group{margin:28px 0 44px}.plan-group-head{border-bottom:1px solid var(--line);margin-bottom:16px}.plan-group-head h2{margin:0 0 4px}.plan-group-head p{margin:0 0 12px;color:var(--muted)}.plan-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px}.plan-step{display:flex;flex-direction:column}.plan-step h3{margin:4px 0 10px}.plan-step ol{padding-left:20px;font-size:14px;line-height:1.55;flex:1}.plan-step li{margin:5px 0}.plan-step .toolbar{margin-top:10px}