:root{--body: #fff;--alt: #f9f9f9;--text: #343434;--muted: #6f7f88;--heading: #111;--primary: #15303e;--accent: #5fd1b3;--border: #d9e1e4;--footer: #ced7d9;--max: 1200px;font-family:Hind,Helvetica,Arial,sans-serif;color:var(--text);background:var(--body)}*{box-sizing:border-box}body{margin:0;font-size:16px;line-height:1.6}a{color:inherit}img,video{max-width:100%;height:auto}.site-header{min-height:104px;display:flex;align-items:center;justify-content:space-between;gap:24px;max-width:var(--max);margin:0 auto;padding:18px 40px;background:#fff}.brand{display:inline-flex;align-items:center;text-decoration:none;font-weight:700;color:var(--primary)}.header-left{display:flex;align-items:center;gap:18px;min-width:0}.back-link{display:grid;place-items:center;width:36px;height:36px;color:var(--primary);text-decoration:none}.back-link span{width:13px;height:13px;border-left:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg)}.back-link:hover{background:var(--alt)}.brand img{width:210px;max-height:58px;object-fit:contain}.site-header nav{display:flex;align-items:center;gap:28px;color:#757575}.site-header nav a{text-decoration:none}.site-header nav a:hover,.track-menu button:hover,.logout-button:hover{color:var(--primary)}.track-menu{position:relative;padding:10px 0;margin:-10px 0}.track-menu button,.logout-button{border:0;background:transparent;color:#757575;font:inherit;padding:0;cursor:pointer}.track-menu button:after{content:"";display:inline-block;width:7px;height:7px;margin-left:10px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg) translateY(-3px)}.track-dropdown{display:none;position:absolute;top:100%;right:0;z-index:10;width:280px;padding:14px 0;background:#fff;border:1px solid var(--border);box-shadow:0 18px 45px #15303e24}.track-menu--open .track-dropdown{display:grid}.track-dropdown a{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:10px 18px;color:#757575}.track-dropdown a:hover,.track-dropdown a.active{background:var(--alt);color:var(--primary)}.track-dropdown small{display:block;color:#9aa5aa}.track-check{color:var(--primary);font-weight:700}.hero{background:var(--alt);border-top:1px solid #f1f1f1}.wrapper,.section{max-width:var(--max);margin:0 auto}.hero .wrapper{display:flex;align-items:center;gap:18px;padding:28px 40px 40px}.hero h1{margin:0;font-family:Open Sans,Helvetica,Arial,sans-serif;font-size:clamp(2rem,4vw,3.4rem);line-height:1.2;color:#30363a}.section{padding:40px}.intro{text-align:center;margin:0 0 32px}.section--track-index{max-width:980px}.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:34px}.card-grid--compact{grid-template-columns:repeat(auto-fit,350px);justify-content:center}.card{text-align:center;text-decoration:none;color:var(--text)}.card img{width:100%;aspect-ratio:1;object-fit:cover}.card-placeholder{display:grid;place-items:center;width:100%;aspect-ratio:1;padding:24px;background:#eef2f3;color:var(--primary);font-family:Open Sans,Helvetica,Arial,sans-serif;font-size:1.3rem;font-weight:700}.card--compact .card-placeholder{height:350px;aspect-ratio:auto;padding:20px;background:#d3dcdf;color:#3a4246;font-size:1rem;letter-spacing:0}.card--compact img{height:350px;aspect-ratio:auto}.card--compact h2{font-size:1rem;margin-top:14px}.card--compact p{font-size:.92rem}.card h2{font-size:1.15rem;margin:16px 0 4px;color:var(--heading);text-decoration:underline}.card p{margin:0;color:var(--muted);text-decoration:underline}.course-page,.lesson-page{display:grid;grid-template-columns:352px minmax(0,1fr);gap:34px;align-items:start}.course-sidebar{border:1px solid var(--border);padding:18px 16px}.course-sidebar h2{margin:-48px 0 18px;font-size:1rem;color:#111}.course-sidebar h3{font-size:1.35rem;line-height:1.3;margin:0 0 18px}.count{color:var(--muted)}.lesson-list{display:grid;gap:12px}.lesson-row{display:grid;grid-template-columns:132px minmax(0,1fr);gap:18px;align-items:center;padding:14px;border:1px solid var(--border);text-decoration:none}.lesson-row:hover{border-color:var(--primary)}.lesson-thumb{aspect-ratio:16 / 9;background:#eef2f3}.lesson-thumb img{width:100%;height:100%;object-fit:cover}.lesson-row h3{margin:0;font-size:1.05rem;line-height:1.35}.lesson-row p{margin:4px 0 0;color:var(--muted)}.side-lessons{display:grid}.side-lessons a{min-height:72px;display:grid;grid-template-columns:20px minmax(0,1fr) 68px;gap:10px;align-items:center;padding:12px 0;border-bottom:1px solid var(--border);text-decoration:none;color:#60717b;font-size:.94rem;line-height:1.3}.side-lessons a.active{color:#252b2f;font-weight:700}.side-lessons img{width:68px;height:38px;object-fit:cover}.status-dot{width:20px;height:20px;border:1px solid #c6d1d6;border-radius:50%}.active .status-dot{border-color:var(--primary)}.lesson-content h1{margin:0 0 28px;font-family:Open Sans,Helvetica,Arial,sans-serif;font-size:clamp(1.8rem,3vw,2.4rem);line-height:1.25;color:var(--heading)}.video-wrapper{background:#eef2f3;margin-bottom:10px}.video-wrapper video{display:block;width:100%}.course-lesson__embedded-viewer{display:block;width:100%;height:min(78vh,900px);min-height:720px;border:0;background:#f3f4f5}.course-lesson__asset__download-links{display:flex;gap:18px;flex-wrap:wrap;justify-content:flex-end;color:#777;margin:8px 0 28px;font-size:.92rem}.course-lesson__asset__download-links a{color:#777;text-decoration:none}.course-lesson__asset__download-links svg{width:14px;height:14px;margin-right:4px;vertical-align:-2px}.wysiwyg-content{max-width:820px}.wysiwyg-content p{margin:0 0 1.1rem}.wysiwyg-content img{display:block;margin:20px auto}.lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:44px;padding-top:24px;border-top:1px solid var(--border)}.lesson-nav a{color:var(--primary);text-decoration:none}.lesson-nav a:last-child{text-align:right}.site-footer{margin-top:40px;background:var(--footer);color:#fff;padding:34px 40px;text-align:center}.login-page{min-height:100vh;display:grid;place-items:center;padding:24px;background:var(--alt)}.login-panel{width:min(100%,420px);padding:34px;background:#fff;border:1px solid var(--border)}.login-panel h1{margin:0 0 8px;font-family:Open Sans,Helvetica,Arial,sans-serif;font-size:2rem;line-height:1.2;color:var(--heading)}.login-panel p{margin:0 0 24px;color:var(--muted)}.login-panel label{display:block;margin:18px 0 8px;font-weight:700;color:#30363a}.login-panel input{width:100%;height:46px;border:1px solid #cbd5d9;padding:0 12px;font:inherit}.login-panel button{width:100%;height:48px;margin-top:24px;border:0;background:var(--primary);color:#fff;font:700 1rem Hind,Helvetica,Arial,sans-serif;cursor:pointer}.login-panel button:disabled{opacity:.65;cursor:wait}.login-error{padding:12px;margin:0 0 18px;border:1px solid #c27b68;background:#fff6f3;color:#7f3525}@media(max-width:820px){.site-header{min-height:80px;padding:16px;align-items:flex-start;flex-direction:column}.site-header nav{gap:16px}.hero .wrapper,.section{padding-left:16px;padding-right:16px}.course-page,.lesson-page{grid-template-columns:1fr}.course-lesson__embedded-viewer{height:70vh;min-height:520px}.course-sidebar h2{margin-top:0}}