:root{--ink:#102a3a;--navy:#082536;--blue:#146b8c;--cyan:#55c2d3;--paper:#f5f7f5;--white:#fff;--muted:#60717c;--line:#dbe3e5;--gold:#bf9354;--good:#13745a;--danger:#a43b3b;--shadow:0 18px 48px rgba(8,37,54,.10)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:"DM Sans",Arial,sans-serif;line-height:1.55}a{color:var(--blue)}.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:12px;background:#fff;padding:10px;z-index:100}.site-header{height:76px;padding:0 clamp(18px,4vw,64px);background:var(--navy);display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:16px;color:#fff;text-decoration:none;font-weight:600}.brand img{width:164px;height:auto;filter:none}.brand span{padding-left:16px;border-left:1px solid rgba(255,255,255,.25);letter-spacing:.08em;text-transform:uppercase;font-size:.78rem}.site-header 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15px}.video-frame{position:relative;padding-top:56.25%;background:#071c28;border-radius:10px;overflow:hidden;box-shadow:var(--shadow);margin-top:28px}.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.watch-card{margin:16px 0 25px;background:#fff;border:1px solid var(--line);border-radius:8px;padding:16px 18px}.watch-card__line{display:flex;justify-content:space-between;gap:16px}.watch-card small{display:block;color:var(--muted)}.watch-bar{height:8px;background:#e6ecee;border-radius:99px;overflow:hidden;margin-top:12px}.watch-bar span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--cyan));transition:width .3s}.lesson-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-top:26px}.locked{opacity:.55;pointer-events:none}.form-shell{max-width:830px;margin:54px auto;padding:0 20px}.question{border-top:1px solid var(--line);padding:24px 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