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solid var(--line);color:var(--faint);font-family:var(--mono);font-size:13px}.lesson-list li.done .ln{background:var(--brass);border-color:var(--brass);color:#fff}.lesson-list .lt{flex:1;min-width:0}.lesson-list .lt b{display:block;font-size:16px;margin-bottom:3px}.lesson-list .lt em{font-style:normal;font-size:13.5px;color:var(--faint);display:block}.lesson-list .lc{flex:0 0 auto;color:var(--faint);font-size:18px}.lesson-list li.exam-row a{border-color:var(--brass);background:linear-gradient(180deg,var(--brass-dim),transparent)}.lesson-list li.exam-row.locked a{opacity:.55;border-color:var(--line-soft);background:var(--surface)}.lesson-list li.exam-row .ln{background:var(--brass);border-color:var(--brass);color:#fff}.lesson-list li.exam-row.locked .ln{background:var(--ink-2);border-color:var(--line);color:var(--faint)}.lesson{max-width:760px;padding-bottom:20px}.lesson-body p{color:var(--muted);font-size:16.5px;line-height:1.72;margin:0 0 16px}.lesson-body p em{color:var(--text);font-size:17px}.lesson-body h3{margin:26px 0 8px;color:var(--brass)}.lesson-body .keybox{margin-top:24px}.lesson-h{font-family:var(--body);font-size:19px;font-weight:700;margin:30px 0 8px;color:var(--brass)}.lesson-p{color:var(--muted);font-size:16.5px;line-height:1.72;margin:0}.keybox{background:var(--surface);border:1px solid var(--line-soft);border-left:4px solid var(--brass);border-radius:var(--r-sm);padding:20px 22px;margin:34px 0 8px;box-shadow:var(--shadow)}.keybox ul{margin:0;padding:0;list-style:none}.keybox li{padding:8px 0 8px 24px;position:relative;color:var(--text);font-size:15px;border-bottom:1px solid var(--line-soft)}.keybox li:last-child{border-bottom:0}.keybox li:before{content:"◆";position:absolute;left:0;top:8px;color:var(--brass);font-size:10px}.lesson-nav{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:36px 0 10px;padding-top:24px;border-top:1px solid var(--line-soft)}.qbox{background:var(--surface);border:1px solid var(--line-soft);border-radius:var(--r);padding:22px;margin-bottom:16px;box-shadow:var(--shadow);max-width:760px}.qbox.wrong{border-color:#c0392b}.qn{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--brass);margin:0 0 8px}.qt{font-size:17px;font-weight:600;margin:0 0 16px}.opt{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;margin-bottom:8px;border:1px solid var(--line-soft);border-radius:var(--r-sm);cursor:pointer;transition:.15s}.opt:hover{border-color:var(--brass);background:var(--brass-dim)}.opt input{margin-top:3px;accent-color:var(--brass);flex:0 0 auto}.opt span{font-size:15px;color:var(--muted)}.opt:has(input:checked){border-color:var(--brass);background:var(--brass-dim)}.opt:has(input:checked) span{color:var(--text);font-weight:600}.result-ring{width:170px;height:170px;border-radius:50%;margin:0 auto;display:grid;place-content:center;border:8px solid var(--c);background:var(--surface);box-shadow:var(--shadow)}.result-ring.no{border-color:var(--line)}.result-ring b{display:block;font-family:var(--display);font-size:48px;line-height:1}.result-ring span{font-family:var(--mono);font-size:12px;color:var(--faint)}.cert-preview{margin:14px 0 26px;min-height:120px}.cert-preview img{display:block}