.ysk{--night:#0a1c13;--night2:#0d2418;--gold:#c9a961;--goldpale:#f0e2bd;--gold2:#e3c98a;--mist:#bfb49a;--serif:'Cormorant Garamond','Times New Roman',serif;--text:'Lora',Georgia,serif;--w:min(640px,84vw);
position:relative;padding:96px 0 88px;background:radial-gradient(ellipse at 50% 0%,#17392a 0%,var(--night2) 55%,var(--night) 100%);color:var(--goldpale);font-family:var(--text);overflow:hidden}
.ysk *,.ysk *::before,.ysk *::after{box-sizing:border-box}
.ysk::before{content:"";position:absolute;left:50%;top:44%;width:900px;height:520px;transform:translate(-50%,-50%);background:radial-gradient(ellipse,rgba(227,201,138,.13),transparent 65%);pointer-events:none}
.ysk-wrap{position:relative;max-width:1200px;margin:0 auto;padding:0 24px}
.ysk-head{text-align:center}
.ysk-kicker{display:inline-flex;align-items:center;gap:12px;font-family:var(--serif);text-transform:uppercase;letter-spacing:.3em;font-size:13.5px;color:var(--gold);margin-bottom:14px}
.ysk-kicker::before,.ysk-kicker::after{content:"";width:30px;height:1px;background:currentColor;opacity:.6}
.ysk-h2{font-family:var(--serif);font-weight:500;font-size:clamp(32px,4.6vw,54px);line-height:1.12;margin:0 0 16px;color:var(--goldpale)}
.ysk .ysk-sub{max-width:680px;margin:0 auto 30px;padding:0;font-size:17.5px;line-height:1.7;color:var(--mist);text-align:center}
.ysk-modes{display:inline-flex;padding:4px;border:1px solid rgba(201,169,97,.45);border-radius:999px;background:rgba(10,28,19,.5);margin-bottom:34px}
.ysk-modes button{font:inherit;font-size:15px;padding:9px 20px;border:0;border-radius:999px;background:none;color:var(--goldpale);cursor:pointer;transition:background .3s,color .3s}
.ysk-modes button[aria-pressed="true"]{background:linear-gradient(135deg,#f0dca4,#c9a961 55%,#a8884a);color:var(--night);box-shadow:0 6px 18px rgba(201,169,97,.25)}
.ysk-modes button:focus-visible,.ysk-arw:focus-visible,.ysk-th:focus-visible,.ysk-btn:focus-visible,.ysk-open:focus-visible{outline:2px solid var(--gold2);outline-offset:3px}
/* дорожка */
.ysk-stage{position:relative;margin:0 calc(50% - 50vw);-webkit-mask-image:linear-gradient(90deg,transparent 0,#000 9%,#000 91%,transparent 100%);mask-image:linear-gradient(90deg,transparent 0,#000 9%,#000 91%,transparent 100%)}
.ysk-track{list-style:none;margin:0;padding:18px calc(50% - var(--w) / 2) 30px;display:flex;gap:clamp(14px,2.4vw,28px);overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none;-webkit-overflow-scrolling:touch;outline:none}
.ysk-track::-webkit-scrollbar{display:none}
.ysk-slide{flex:0 0 var(--w);scroll-snap-align:center;transition:transform .55s cubic-bezier(.2,.7,.2,1),opacity .55s,filter .55s;transform:scale(.88);opacity:.42;filter:saturate(.7);cursor:pointer}
.ysk-slide.on{transform:none;opacity:1;filter:none;cursor:default}
.ysk-card{position:relative;border-radius:14px;overflow:hidden;aspect-ratio:653/380;background:#00180c;box-shadow:0 2px 0 rgba(201,169,97,.25),0 22px 50px -18px rgba(0,0,0,.75)}
.ysk-slide.on .ysk-card{box-shadow:0 0 0 1px rgba(201,169,97,.35),0 26px 60px -16px rgba(0,0,0,.8),0 0 70px -10px rgba(227,201,138,.28)}
.ysk-card img{display:block;width:100%;height:100%;object-fit:cover;user-select:none;-webkit-user-drag:none}
/* вуаль режима «Вспомнить» */
.ysk-veil{position:absolute;left:3.6%;right:3.6%;bottom:4.2%;display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap;padding:0 12px;border-radius:6px;background:linear-gradient(180deg,#00180d,#001e11);border-top:1px solid rgba(201,169,97,.4);opacity:0;visibility:hidden;transition:opacity .45s,visibility .45s}
.ysk.is-recall .ysk-veil{opacity:1;visibility:visible}
.ysk.is-recall .ysk-slide.shown .ysk-veil{opacity:0;visibility:hidden}
.ysk-veil-q{font-family:var(--serif);font-style:italic;font-size:clamp(14px,2.3vw,20px);color:var(--mist)}
.ysk-open{font:inherit;font-size:clamp(13px,1.9vw,15px);padding:7px 16px;border-radius:999px;border:1px solid var(--gold);background:rgba(201,169,97,.12);color:var(--goldpale);cursor:pointer;transition:.3s}
.ysk-open:hover{background:var(--gold);color:var(--night)}
.ysk-slide:not(.on) .ysk-open{pointer-events:none}
.ysk-tick{position:absolute;top:5%;right:4.5%;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#f0dca4,#c9a961);box-shadow:0 4px 14px rgba(0,0,0,.4);transform:scale(0);transition:transform .45s cubic-bezier(.3,1.6,.5,1)}
.ysk-tick svg,.ysk-th i svg{width:60%;height:60%;fill:none;stroke:var(--night);stroke-width:3.2;stroke-linecap:round;stroke-linejoin:round}
.ysk.is-recall .ysk-slide.shown .ysk-tick{transform:scale(1)}
/* навигация */
.ysk-nav{display:flex;align-items:center;justify-content:center;gap:18px;margin-top:4px}
.ysk-arw{width:46px;height:46px;border-radius:50%;border:1px solid var(--gold);background:none;color:var(--goldpale);font-size:18px;cursor:pointer;transition:.3s;display:grid;place-items:center}
.ysk-arw:hover:not(:disabled){background:var(--gold);color:var(--night)}
.ysk-arw:disabled{opacity:.3;cursor:default}
.ysk-count{font-family:var(--serif);font-size:24px;letter-spacing:.06em;min-width:92px;text-align:center;color:var(--gold2)}
.ysk-count span{color:var(--mist);font-size:18px}
.ysk-thumbs{display:grid;grid-template-columns:repeat(8,1fr);gap:10px;max-width:var(--w);margin:26px auto 0}
.ysk-th{position:relative;padding:0;border:1px solid rgba(201,169,97,.25);border-radius:8px;overflow:hidden;aspect-ratio:4/3;background:#00180c;cursor:pointer;opacity:.55;transition:opacity .3s,border-color .3s,transform .3s}
.ysk-th img{position:absolute;top:0;left:50%;height:175%;width:auto;max-width:none;transform:translateX(-50%);display:block}
.ysk-th b{position:absolute;left:5px;top:3px;font-family:var(--serif);font-weight:600;font-size:13px;color:var(--goldpale);text-shadow:0 1px 4px #000,0 0 8px #000;z-index:1}
.ysk-th i{position:absolute;right:4px;bottom:4px;width:16px;height:16px;border-radius:50%;background:var(--gold);display:grid;place-items:center;transform:scale(0);transition:transform .35s;z-index:1}
.ysk-th.seen{opacity:.85}
.ysk-th.seen i{transform:scale(1)}
.ysk-th.on{opacity:1;border-color:var(--gold2);transform:translateY(-3px)}
.ysk-th:hover{opacity:1}
/* прогресс */
.ysk-prog{max-width:var(--w);margin:24px auto 0;display:flex;align-items:center;gap:14px;font-size:14.5px;color:var(--mist)}
.ysk-bar{flex:1;height:3px;border-radius:3px;background:rgba(201,169,97,.18);overflow:hidden}
.ysk-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,#a8884a,#f0dca4);transition:width .6s cubic-bezier(.2,.7,.2,1)}
.ysk-acts{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:22px}
.ysk-btn{display:inline-flex;align-items:center;gap:8px;font:inherit;font-size:14px;padding:9px 16px;border-radius:999px;border:1px solid var(--gold);background:transparent;color:var(--goldpale);text-decoration:none;cursor:pointer;transition:.3s;line-height:1.2}
.ysk-btn:hover{background:var(--gold);color:var(--night)}
.ysk-btn--solid{background:linear-gradient(135deg,#f0dca4,#c9a961 55%,#a8884a);color:var(--night);border-color:transparent}
.ysk-btn--solid:hover{filter:brightness(1.08);color:var(--night)}
.ysk-done{max-width:var(--w);margin:26px auto 0;padding:22px 24px;text-align:center;border:1px solid rgba(201,169,97,.4);border-radius:14px;background:rgba(201,169,97,.07)}
.ysk-done p{margin:0 0 14px;font-family:var(--serif);font-size:22px;line-height:1.4;color:var(--goldpale)}
.ysk-done[hidden]{display:none}
.ysk-toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);padding:10px 18px;border-radius:999px;background:var(--goldpale);color:var(--night);font-size:14px;opacity:0;pointer-events:none;transition:.35s;z-index:9999}
.ysk-toast.on{opacity:1;transform:translate(-50%,0)}
/* текстом */
.ysk-list{max-width:var(--w);margin:34px auto 0;border-top:1px solid rgba(201,169,97,.25)}
.ysk-list summary{list-style:none;cursor:pointer;padding:16px 0;text-align:center;font-family:var(--serif);font-size:19px;color:var(--gold2)}
.ysk-list summary::-webkit-details-marker{display:none}
.ysk-list summary::after{content:" ↓";transition:.3s;display:inline-block}
.ysk-list[open] summary::after{transform:rotate(180deg)}
.ysk-list ol{margin:0;padding:0 0 6px 1.6em;font-size:16.5px;line-height:1.7;color:var(--goldpale)}
.ysk-list li{margin:0 0 10px;padding-left:.3em}
.ysk-list li::marker{font-family:var(--serif);color:var(--gold);font-weight:600}
.ysk-list strong{font-weight:600;color:#fff6de}
.ysk-list li span{color:var(--mist)}
@media (max-width:640px){
.ysk{padding:68px 0 64px;--w:86vw}
.ysk-wrap{padding:0 16px}
.ysk .ysk-sub{font-size:16px}
.ysk-thumbs{grid-template-columns:repeat(4,1fr);gap:8px}
.ysk-veil{gap:8px;padding:0 6px}
.ysk-veil-q{display:none}
.ysk-tick{width:24px;height:24px}
.ysk-track{padding-left:7vw;padding-right:7vw}
}
@media (prefers-reduced-motion:reduce){.ysk *{transition:none!important}}
@media print{.ysk{display:none}}
/* навигация по разделам урока (панель вверху) */
.ysk-more{display:none;align-items:center;gap:5px;flex-shrink:0;padding:8px 12px;border-radius:999px;border:1px solid rgba(201,169,97,.4);background:none;color:#f0e2bd;font:inherit;font-size:14px;line-height:1.2;cursor:pointer;white-space:nowrap}
.ysk-more svg{width:12px;height:12px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round;transition:transform .3s}
.ysk-more[aria-expanded="true"]{background:#c9a961;color:#0a1c13;border-color:#c9a961}
.ysk-more[aria-expanded="true"] svg{transform:rotate(180deg)}
.ysk-menu{position:fixed;z-index:9998;right:12px;min-width:220px;padding:8px;border-radius:16px;background:#0d2418;border:1px solid rgba(201,169,97,.4);box-shadow:0 18px 40px rgba(0,0,0,.45);opacity:0;visibility:hidden;transform:translateY(-6px);transition:opacity .25s,transform .25s,visibility .25s;font-family:'Lora',Georgia,serif}
.ysk-menu.on{opacity:1;visibility:visible;transform:none}
.ysk-menu a{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:10px;color:#f0e2bd;text-decoration:none;font-size:15.5px}
.ysk-menu a:hover,.ysk-menu a:focus-visible{background:rgba(201,169,97,.14);outline:none}
.ysk-menu a i{width:8px;height:8px;border-radius:50%;background:#c9a961;flex-shrink:0;opacity:.75}
@media (max-width:760px){.ysk-more{display:inline-flex}}