:root{color-scheme:dark;--bg:#0b1115;--panel:#111b21;--text:#edf1ec;--muted:#a5b2b7;--gold:#dcc28a}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.65 system-ui,sans-serif}header{padding:20px 5vw;display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid #26343b}a{color:var(--gold);text-decoration:none}header span,.muted,.description{color:var(--muted)}main{max-width:1250px;margin:40px auto;padding:0 24px}.eyebrow{letter-spacing:.2em;color:var(--gold);font-size:11px}h1{font-size:clamp(28px,4vw,44px);line-height:1.2;margin:12px 0}.description{max-width:800px}h2{font-size:18px;margin:0}.lesson-frame{margin:28px 0;background:white;border:1px solid #33434b;border-radius:12px;overflow:hidden;height:75vh;min-height:440px}.lesson-frame iframe{width:100%;height:100%;border:0}.lesson-frame.video{aspect-ratio:16/9;height:auto;min-height:0}.completion{display:flex;gap:24px;justify-content:space-between;align-items:center;background:var(--panel);padding:24px;border:1px solid #26343b;border-radius:12px}.completion p{margin:8px 0 0;color:var(--muted)}button{font:inherit;font-weight:700;color:#131c21;background:var(--gold);border:0;border-radius:8px;padding:13px 20px;cursor:pointer;white-space:nowrap}button:disabled{opacity:.65;cursor:default}#lessonStatus{color:var(--gold)}.course-access-gate{max-width:850px;overflow-wrap:anywhere}.access-prerequisites{margin:28px 0;padding:24px;background:var(--panel);border:1px solid #26343b;border-radius:12px}.access-prerequisites ol{margin:16px 0 0;padding-left:24px}.access-prerequisites li{padding:12px 0;border-top:1px solid #26343b}.access-prerequisites li>span:first-child{display:block;font-weight:600}.access-action{display:inline-block;margin-top:8px;padding:9px 14px;border:1px solid #685b41;border-radius:8px;font-weight:600}.access-action:focus-visible{outline:3px solid var(--gold);outline-offset:3px}.access-primary{color:#131c21;background:var(--gold)}@media(max-width:650px){header span{display:none}main{padding:0 16px;margin:28px auto}.completion{align-items:stretch;flex-direction:column;padding:18px}.lesson-frame{min-height:350px}.access-prerequisites{padding:18px}.access-primary{width:100%;text-align:center}}