.gf2-start-course{margin-right:auto;padding:13px 18px}.gf2-section-intro{padding:24px 22px 12px}.gf2-section-intro h2{margin:4px 0 6px;color:#0b2940}.gf2-section-intro p:last-child{color:#617b8b;max-width:760px}.gf2-course-shell{display:grid;grid-template-columns:280px minmax(0,1fr);gap:18px;align-items:start}.gf2-course-nav{position:sticky;top:16px;max-height:calc(100vh - 32px);overflow:auto;border:1px solid #d6e3ea;border-radius:20px;background:#fff;box-shadow:0 12px 34px #14384b10}.gf2-course-nav>div:first-child{padding:22px;border-bottom:1px solid #dce7ec}.gf2-course-nav h3{margin:4px 0 6px;color:#0b2940}.gf2-course-nav small{color:#6a8190;line-height:1.5}.gf2-course-nav>div:last-child{display:grid;padding:9px}.gf2-course-nav button{display:grid;grid-template-columns:28px 1fr;gap:9px;align-items:center;border:0;border-radius:11px;background:transparent;color:#496779;padding:10px;text-align:left}.gf2-course-nav button:hover{background:#edf6f5}.gf2-course-nav button.active{background:#dff7ef;color:#087d68}.gf2-course-nav button span{display:grid;place-items:center;width:25px;height:25px;border-radius:50%;background:#e7eef2;font-size:11px;font-weight:900}.gf2-course-nav button.active span{background:#15b891;color:#fff}.gf2-course-nav button b{font-size:12px;line-height:1.25}.gf2-course-stage{overflow:hidden;border:1px solid #d3e0e7;border-radius:22px;background:#fff;box-shadow:0 18px 48px #14384b13}.gf2-slide-count{padding:12px 20px;background:#0b2c42;color:#cae0e9;font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.gf2-course-visual{position:relative;height:250px;overflow:hidden;background:#0b2c42}.gf2-course-visual img{width:100%;height:100%;object-fit:cover;filter:saturate(.9);transform:scale(1.02)}.gf2-course-visual:after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,#08263ddd 0%,#08263d55 58%,transparent 100%)}.gf2-visual-overlay{position:absolute;z-index:1;left:28px;bottom:26px;max-width:70%;color:#fff}.gf2-visual-overlay span,.gf2-visual-overlay b{display:block}.gf2-visual-overlay span{color:#6ce0bf;font-size:11px;font-weight:900;text-transform:uppercase;letter-spacing:.08em}.gf2-visual-overlay b{font-size:clamp(24px,4vw,40px);line-height:1.05;margin-top:6px;text-shadow:0 2px 10px #0006}.gf2-course-copy{padding:30px;min-height:360px;color:#19384b}.gf2-course-copy h2{font-size:clamp(27px,4vw,42px);line-height:1.08;margin:5px 0 12px;color:#092940}.gf2-course-lead{font-size:18px;line-height:1.6;color:#527083;max-width:820px}.gf2-course-copy ul{display:grid;gap:11px;padding:0;margin:24px 0;list-style:none}.gf2-course-copy li{position:relative;padding:14px 16px 14px 46px;border:1px solid #dce7ec;border-radius:13px;background:#f8fbfc;line-height:1.5}.gf2-course-copy li:before{content:'✓';position:absolute;left:15px;top:13px;display:grid;place-items:center;width:22px;height:22px;border-radius:50%;background:#d9f6ec;color:#078069;font-weight:900}.gf2-course-copy .gf2-formula{margin:24px 0;background:linear-gradient(120deg,#edf7ff,#f8fbff);border:1px solid #cfe1ed;border-left:5px solid #168cda}.gf2-course-copy .gf2-formula strong{white-space:pre-wrap;line-height:1.65}.gf2-course-copy .gf2-formula p{margin:3px 0 0;color:#607d8d;font-size:12px}.gf2-worked{display:grid;gap:9px;padding:20px;border-radius:16px;background:#eff9f5;border:1px solid #bfe7da;margin:22px 0}.gf2-worked>b{color:#087c68;text-transform:uppercase;letter-spacing:.06em;font-size:11px}.gf2-worked>div{display:grid;grid-template-columns:32px 1fr;align-items:center;gap:10px}.gf2-worked span{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:#0b3850;color:#fff;font-weight:800}.gf2-worked p{margin:0}.gf2-worked>strong{padding:12px 14px;border-radius:10px;background:#d7f4e9;color:#08705f}.gf2-course-controls{display:flex;justify-content:space-between;gap:12px;padding:18px 30px;border-top:1px solid #dce7ec;background:#f8fbfc}.gf2-course-controls button:disabled{opacity:.4;cursor:not-allowed}
.gf2-slide-source{margin-top:28px;padding-top:14px;border-top:1px solid #dbe6ec;color:#6a8190;font-size:12px}.gf2-slide-source b{color:#33576b}.gf2-course-visual img[src*="gf2/"]{filter:saturate(.92) contrast(1.02)}
.gf2-topic-quiz{border-color:#8fcfbe!important;background:#f1fbf7!important;color:#087460!important}.gf2-topic-quiz:before{content:'✓';display:inline-grid;place-items:center;width:22px;height:22px;margin-right:7px;border-radius:50%;background:#d8f5ea;color:#087460;font-weight:900}
@media(max-width:900px){.gf2-course-shell{grid-template-columns:1fr}.gf2-course-nav{position:static;max-height:none}.gf2-course-nav>div:last-child{display:flex;overflow-x:auto}.gf2-course-nav button{min-width:180px}.gf2-course-visual{height:210px}}
@media(max-width:600px){.gf2-course-copy{padding:22px 18px}.gf2-course-controls{padding:15px 18px}.gf2-course-controls button{flex:1}.gf2-visual-overlay{left:18px;bottom:18px;max-width:88%}.gf2-course-nav>div:first-child{padding:18px}.gf2-course-lead{font-size:16px}}