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.ls-tab-btn{padding:var(--sp-2) var(--sp-4);font-family:var(--font-sans);color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-bottom:3px solid #0000;flex-shrink:0;font-size:14px;font-weight:600;transition:color .15s,border-color .15s}.lesson-body .ls-tab-btn:hover{color:var(--text)}.lesson-body .ls-tab-btn.ls-tab-active{color:var(--accent);border-bottom-color:var(--accent)}.lesson-body .ls-tab-body{background:var(--surface)}.lesson-body .ls-tab-panel{padding:var(--sp-4);color:var(--text);font-size:14.5px;line-height:1.7}.lesson-body .ls-tab-panel>:first-child{margin-top:0}.lesson-body .ls-tab-panel>:last-child{margin-bottom:0}.lesson-body .ls-tab-panel+.ls-tab-panel{border-top:1px solid var(--border)}.lesson-body .ls-tabs-js-ready .ls-tab-panel{display:none}.lesson-body .ls-tabs-js-ready .ls-tab-panel.ls-tab-panel-active{animation:.3s lsTabFade;display:block}.lesson-body .ls-tabs-js-ready .ls-tab-panel+.ls-tab-panel{border-top:none}@keyframes lsTabFade{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.lesson-body .ls-steps{margin:var(--sp-3) 0;flex-direction:column;display:flex}.lesson-body .ls-step{gap:var(--sp-3);align-items:flex-start;display:flex}.lesson-body .ls-step-track{flex-direction:column;flex-shrink:0;align-items:center;display:flex}.lesson-body .ls-step-dot{background:var(--accent);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-size:13px;font-weight:800;display:flex;box-shadow:0 0 0 3px #ff6a1a2e}.lesson-body .ls-step-line{width:2px;min-height:var(--sp-4);background:var(--border-strong);flex:1;margin:4px 0}.lesson-body .ls-step-content{padding:4px 0 var(--sp-4);color:var(--text);flex:1;font-size:15px;line-height:1.65}.lesson-body .ls-step:last-child .ls-step-content{padding-bottom:0}@media (width<=600px){.lesson-body .ls-flashcard-group{grid-template-columns:1fr}.lesson-body .ls-tab-btn{padding:var(--sp-2) var(--sp-3);font-size:13px}}.ls-graduation{border-radius:var(--radius-lg);padding-top:var(--sp-4);padding-bottom:var(--sp-5);background:radial-gradient(120% 60% at 50% 0,#fbbf241a 0%,#fbbf2400 60%),linear-gradient(#ff6a1a0b 0%,#ff6a1a00 45%);position:relative}.ls-graduation .ls-grad-badge{align-items:center;gap:var(--sp-2);color:#3b2500;letter-spacing:.4px;text-transform:uppercase;margin-bottom:var(--sp-3);background:linear-gradient(135deg,#fbbf24,#f59e0b);border-radius:999px;padding:6px 16px 6px 12px;font-size:12.5px;font-weight:800;display:inline-flex;box-shadow:0 4px 14px #f59e0b4d}.ls-graduation>h1{padding-bottom:var(--sp-3);border-bottom:3px solid #fbbf248c;font-size:30px;line-height:1.25}.ls-graduation .lesson-body .ls-block{border-color:#f59e0b4d;box-shadow:0 3px 14px #f59e0b1a}.ls-graduation .lesson-body h2{border-left-color:#f59e0b}.ls-graduation .ls-gate-btn{background:linear-gradient(135deg,#f59e0b,#ea580c);border-color:#0000}@media (width<=640px){.ls-graduation>h1{font-size:24px}.ls-graduation{padding-top:var(--sp-3);padding-bottom:var(--sp-4)}}