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#2251a433}.roadmap-complete{position:relative}.roadmap-complete:after{background:var(--color-accent);color:#fff;content:"✓";border-radius:50%;justify-content:center;align-items:center;width:26px;height:26px;font-weight:900;display:inline-flex;position:absolute;top:12px;right:12px}@media (width<=700px){.course-progress-panel,.lesson-panel__topline{grid-template-columns:1fr;align-items:stretch}.course-progress-ring{margin:0 auto}.lesson-panel__topline{flex-direction:column}}.math-course{--math-navy:#1a2744;--math-blue:#2563eb;--math-teal:#1d9e75;--math-amber:#d97706;--math-bg:#f0f4f8;--math-muted:#64748b;--math-border:#00000014;background:var(--math-bg);color:var(--math-muted);min-height:100vh;padding-bottom:64px;font-family:Inter,ui-sans-serif,system-ui,sans-serif}.math-course h1,.math-course h2,.math-course h3{color:var(--math-navy);letter-spacing:0;font-family:DM Serif Display,Georgia,serif}.math-container{max-width:1180px;margin:0 auto;padding:0 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#1a274414}.math-sidebar__head{border-bottom:1px solid var(--math-border);justify-content:space-between;align-items:center;padding:10px 8px 14px;display:flex}.math-sidebar__head strong{color:var(--math-navy)}.math-sidebar__head span{color:var(--math-muted);font-size:.84rem;font-weight:800}.math-sidebar button{border:0;border-bottom:1px solid var(--math-border);color:var(--math-navy);cursor:pointer;text-align:left;background:0 0;border-left:3px solid #0000;gap:8px;width:100%;padding:16px 20px;transition:background-color .2s,border-color .2s,box-shadow .2s,transform .2s;display:grid;position:relative}.math-sidebar button:hover{background:#2563eb0d;border-left-color:#2563eb61}.math-sidebar button.active{border-left-color:var(--math-blue);background:#fff;border-radius:12px;margin:8px 0;box-shadow:0 10px 26px #1a27441a}.lesson-kicker{color:var(--math-teal);letter-spacing:.1em;text-transform:uppercase;font-size:11px;font-weight:900}.math-sidebar button 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button{color:var(--math-muted);cursor:pointer;background:0 0;border:0;border-radius:10px;padding:10px;font-size:.82rem;font-weight:900}.segmented-tabs button.active{color:var(--math-navy);background:#fff;box-shadow:0 6px 16px #1a274414}.skill-card ol{color:var(--math-muted);margin:16px 0;padding-left:22px;line-height:1.65}.model-result{color:var(--math-teal);background:#1d9e751a;border-radius:12px;margin-top:12px;padding:12px;font-weight:950}.trap-warning{color:#92400e;background:#d977061c;border:1px solid #d9770633;border-radius:12px;margin-top:14px;padding:12px;font-weight:800;line-height:1.5}.model-question{color:var(--math-navy);font-weight:850;line-height:1.5}@keyframes explanationSlide{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}@keyframes checkPulse{0%{transform:scale(.8)}55%{transform:scale(1.22)}to{transform:scale(1)}}@media 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h1,.english-course h2{letter-spacing:0;font-family:DM Serif Display,Georgia,serif}.english-course h3,.english-course h4{color:var(--eng-navy)}.english-container{max-width:1180px;margin:0 auto;padding:0 28px}.english-hero{color:#fff;background:linear-gradient(135deg,#1a2744 0%,#0f172a 100%);padding:54px 0 88px}.english-breadcrumb{color:#ffffff9e;flex-wrap:wrap;align-items:center;gap:9px;margin-bottom:20px;font-size:.9rem;display:flex}.english-breadcrumb a{color:inherit;text-decoration:none}.english-breadcrumb a:hover,.english-breadcrumb strong{color:#fff}.english-badge,.english-eyebrow{color:var(--eng-teal);letter-spacing:.1em;text-transform:uppercase;font-size:11px;font-weight:900}.english-badge{color:#d9fff3;background:#1d9e752e;border-radius:999px;margin-bottom:16px;padding:8px 12px;display:inline-flex}.english-hero h1{color:#fff;margin:0 0 14px;font-size:clamp(2.6rem,5vw,48px);line-height:1}.english-hero 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