:root{color-scheme:light dark;--ink:#0f172a;--muted:#536278;--blue:#1557d6;--cyan:#008ea8;--paper:#fff;--soft:#f3f7fc;--line:#dce5ef;--shadow:0 20px 60px #1032520d}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.6}a{color:inherit}button{font:inherit}a,button{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,video:focus-visible{outline:3px solid #00a8c6;outline-offset:5px}img{max-width:100%;display:block}.container{width:min(1120px,calc(100% - 48px));margin:auto}.site-header{border-bottom:1px solid var(--line);background:var(--paper)}.header-inner{min-height:88px;display:flex;justify-content:space-between;align-items:center;gap:20px}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;line-height:1.3}.brand img{width:42px;height:42px;border-radius:12px}.brand strong{display:block;font-size:21px;color:var(--blue);letter-spacing:-.6px}.brand small{font-size:12px;color:var(--muted)}.header-link{font-size:14px;text-decoration:none;font-weight:650;white-space:nowrap}.header-link:hover{color:var(--blue)}.skip{position:absolute;top:-100px;left:16px;background:var(--paper);padding:12px;z-index:10}.skip:focus{top:8px}.intro{padding:58px 0 34px}.eyebrow{font-size:12px;font-weight:800;letter-spacing:1.9px;text-transform:uppercase;color:var(--cyan);margin:0 0 14px}.intro h1{font-size:clamp(32px,4.8vw,56px);line-height:1.13;letter-spacing:-1.8px;margin:0 0 18px;font-weight:780}.intro h1 span{color:var(--blue)}.intro .lead{color:var(--muted);max-width:660px;font-size:18px;line-height:1.7;margin:0}.catalog-label{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding-top:24px;margin:8px 0 22px}.catalog-label h2{font-size:20px;margin:0;letter-spacing:-.4px}.count{color:var(--muted);font-size:14px}.lesson-card{display:grid;grid-template-columns:1.18fr 1fr;border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:var(--shadow);background:var(--paper)}.lesson-image{position:relative;display:flex;align-items:center;background:#e7eff9;min-height:300px;overflow:hidden}.lesson-image img{width:100%;height:100%;object-fit:contain;padding:18px}.play-circle{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:grid;place-items:center;width:72px;height:72px;border:1px solid #ffffff66;border-radius:50%;color:white;background:#1557d6;box-shadow:0 6px 28px #10295244}.play-circle svg{width:28px;height:28px;margin-left:4px}.lesson-image:hover .play-circle{background:#1046b0}.lesson-copy{padding:36px;display:flex;align-items:flex-start;flex-direction:column;justify-content:center}.tag{display:inline-flex;align-items:center;gap:7px;background:var(--soft);color:var(--blue);font-size:12px;font-weight:750;padding:5px 10px;border-radius:7px}.lesson-copy h3{font-size:28px;letter-spacing:-.7px;line-height:1.2;margin:15px 0 12px}.lesson-copy p{margin:0 0 18px;color:var(--muted)}.lesson-meta{font-size:13px;color:var(--muted);margin-bottom:22px}.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;border:0;border-radius:12px;padding:12px 18px;background:var(--blue);color:#fff;text-decoration:none;font-size:15px;font-weight:700;cursor:pointer}.button:hover{background:#1046b0}.button svg{width:18px;height:18px}.help-card{display:flex;justify-content:space-between;align-items:center;gap:24px;margin:38px 0 60px;border-radius:18px;border:1px solid var(--line);background:var(--soft);padding:25px 28px}.help-card h2{font-size:19px;letter-spacing:-.3px;margin:0 0 3px}.help-card p{margin:0;color:var(--muted);font-size:14px}.text-link{display:inline-flex;align-items:center;gap:8px;white-space:nowrap;font-weight:700;color:var(--blue);text-underline-offset:4px}.footer{border-top:1px solid var(--line);font-size:13px;color:var(--muted);padding:23px 0}.footer-inner{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}.footer-links{display:flex;gap:22px}.footer a{text-decoration:none}.footer a:hover{text-decoration:underline}.breadcrumb{display:inline-flex;gap:8px;align-items:center;color:var(--muted);font-size:14px;text-decoration:none;margin-bottom:25px}.breadcrumb:hover{color:var(--blue)}.player-intro{padding-top:34px}.player-intro h1{font-size:clamp(30px,4vw,45px);letter-spacing:-1.3px}.player-intro .lead{font-size:17px;max-width:780px}.player-meta{display:flex;gap:14px;align-items:center;margin-top:20px;font-size:13px;color:var(--muted)}.video-frame{position:relative;background:#0b1423;border-radius:20px;overflow:hidden;box-shadow:var(--shadow);line-height:0}.video-frame video{display:block;width:100%;aspect-ratio:var(--video-ratio,16/9);background:#0b1423;object-fit:contain}.start-video{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:10px;border:0;color:#fff;background:#071b3929;cursor:pointer}.start-video .play-circle{position:static;transform:none}.start-label{display:block;font-size:14px;font-weight:750;padding:6px 12px;line-height:1.3;border-radius:8px;background:#0c235ae6}.start-video:hover .play-circle{background:#1046b0}[hidden]{display:none!important}.player-note{display:flex;align-items:flex-start;gap:10px;margin:16px 0 0;font-size:14px;color:var(--muted)}.player-note svg{width:18px;height:18px;margin-top:2px;flex:none}.video-error{border:1px solid #c07321;background:#fff5df;color:#674211;padding:15px 20px;border-radius:12px;margin-top:16px}.video-error a{text-decoration:underline}.noscript-note{color:var(--muted);font-size:14px}.empty{padding:36px;border:1px solid var(--line);border-radius:18px;background:var(--soft)}
@media(max-width:760px){.container{width:calc(100% - 36px)}.header-inner{min-height:76px}.brand small{display:none}.intro{padding:38px 0 26px}.intro h1{letter-spacing:-1.1px}.intro .lead{font-size:16px}.lesson-card{grid-template-columns:1fr}.lesson-image{min-height:0;aspect-ratio:16/9}.lesson-image img{padding:12px}.lesson-copy{padding:25px}.lesson-copy h3{font-size:25px}.help-card{align-items:flex-start;flex-direction:column;gap:14px;padding:22px;margin:28px 0 42px}.footer-inner{flex-direction:column;gap:10px}.player-intro{padding-top:24px}.breadcrumb{margin-bottom:22px}.player-intro h1{font-size:32px}.video-frame{border-radius:12px}.play-circle{width:60px;height:60px}.start-label{font-size:12px}.player-meta{gap:10px;flex-wrap:wrap}}
@media(prefers-color-scheme:dark){:root{--ink:#e5edf8;--muted:#a6b5cb;--blue:#8eb9ff;--cyan:#73d7e8;--paper:#0e1727;--soft:#162337;--line:#29394f;--shadow:0 20px 60px #0002}.button,.play-circle{background:#1557d6;color:#fff}.button:hover{background:#2065e9}.lesson-image{background:#1b2c43}.lesson-image:hover .play-circle{background:#2065e9}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}