.stts-master-list{max-height:560px;overflow:auto;scrollbar-color:var(--gold) var(--surface)}
.stts-classroom .lesson-module h3{line-height:1.5}
.stts-classroom .lesson-list{align-self:start}
.stts-classroom .lesson-button{min-height:60px}
.stts-classroom .lesson-title-row{gap:16px}
.stts-classroom #lesson-counter{flex:none;white-space:normal;max-width:115px;text-align:right}
.stts-classroom .lesson-header h2{font-size:clamp(1.8rem,3vw,2.8rem);line-height:1.2;margin:12px 0}
.stts-classroom .lesson-resources a{min-height:44px;display:inline-flex;align-items:center}
.stts-classroom .lesson-resources{margin-top:24px}
.welcome-body .stts-classroom{margin-top:28px;min-width:0}
.welcome-body .stts-classroom .lesson-layout{grid-template-columns:minmax(0,1fr)}
.welcome-body .stts-classroom .lesson-main{position:static}
.welcome-body .stts-classroom .lesson-list{width:100%}
.welcome-body .stts-classroom .lesson-header h2{font-size:1.8rem}
@media(max-width:620px){.stts-master-list{max-height:440px}.stts-classroom .lesson-navigation{flex-wrap:wrap}.stts-classroom .lesson-navigation>a{order:3;width:100%;text-align:center;min-height:44px;display:grid;place-items:center}}

.stts-course-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:0 0 26px}
.stts-course-option{display:flex;flex-direction:column;gap:5px;border:1px solid var(--line);border-radius:14px;padding:18px 22px;background:var(--surface);min-height:88px}
.stts-course-option strong{font-size:1.1rem;color:var(--text)}
.stts-course-option span{font-size:.875rem;color:var(--muted)}
.stts-older-option{border-color:var(--gold);background:#211d12}
.stts-older-option strong{color:var(--gold-light)}
.stts-course-option:hover{border-color:var(--gold-light);background:#292315}
.stts-tutorial-library{margin-top:56px;padding:28px;border:1px solid var(--gold);border-radius:20px;background:var(--surface);min-width:0;scroll-margin-top:100px}
.stts-library-header{max-width:850px;margin-bottom:24px}
.stts-library-header h2{font-size:clamp(1.5rem,3vw,2.25rem);line-height:1.2;margin:12px 0}
.stts-library-header p{color:var(--muted);line-height:1.7;margin-top:12px}
.stts-library-viewer{max-width:900px;margin:0 auto 32px;scroll-margin-top:100px}
.stts-library-viewer>.eyebrow{display:block;margin-top:18px;font-size:.8rem;line-height:1.6}
.stts-library-viewer h3{font-size:clamp(1.1rem,2.5vw,1.5rem);line-height:1.4;margin:8px 0 18px}
.stts-library-player-nav{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.stts-library-player-nav>a{color:var(--gold-light);font-size:.875rem;min-height:44px;display:flex;align-items:center}
.stts-library-controls{display:flex;flex-wrap:wrap;gap:14px;padding-top:24px;border-top:1px solid var(--line)}
.stts-library-controls label{display:flex;flex-direction:column;gap:8px;flex:1 1 200px;font-size:.875rem;color:var(--muted)}
.stts-library-controls input,.stts-library-controls select{width:100%;min-width:0;border:1px solid var(--line);border-radius:10px;background:#11120f;color:var(--text);padding:12px;font:inherit;min-height:46px;color-scheme:dark}
.stts-library-controls :is(input,select):focus-visible{outline:2px solid var(--gold);outline-offset:2px}
.stts-library-browse{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:20px 0 14px}
.stts-library-browse p{color:var(--muted);font-size:.875rem}
.stts-library-browse>div{display:flex;gap:8px;flex:none}
.stts-library-browse .button{min-width:44px;min-height:44px;padding:8px 16px}
.stts-video-carousel{display:flex;gap:16px;overflow-x:auto;scroll-snap-type:x proximity;scroll-padding:2px;list-style:none;margin:0;padding:3px 3px 18px;scrollbar-color:var(--gold) #11120f;overscroll-behavior-x:contain}
.stts-video-card{flex:0 0 290px;scroll-snap-align:start;min-width:0}
.stts-video-card[hidden]{display:none}
.stts-video-card>a{display:flex;flex-direction:column;height:100%;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#11120f;text-decoration:none;transition:border-color .15s}
.stts-video-card>a:hover,.stts-video-card>a[aria-current=true]{border-color:var(--gold)}
.stts-video-thumb{position:relative;display:block;aspect-ratio:16/9;background:#080a0c;overflow:hidden}
.stts-video-thumb img{display:block;width:100%;height:100%;object-fit:cover}
.stts-video-play{position:absolute;inset:50% auto auto 50%;transform:translate(-50%,-50%);display:grid;place-items:center;width:48px;height:36px;border-radius:10px;background:#e62117;color:#fff;font-size:19px;box-shadow:0 2px 12px #0008}
.stts-video-duration{position:absolute;bottom:8px;right:8px;background:#000d;border-radius:4px;padding:3px 6px;color:#fff;font-size:.75rem;font-variant-numeric:tabular-nums}
.stts-video-copy{display:flex;flex-direction:column;flex:1;gap:12px;padding:16px}
.stts-video-copy small{color:var(--muted);font-size:.75rem;line-height:1.5}
.stts-video-copy strong{color:var(--text);font-size:1rem;line-height:1.45}
.stts-watch-label{color:var(--gold-light);font-size:.875rem;margin-top:auto;padding-top:4px}
.stts-tutorial-library button:disabled{opacity:.4;cursor:default}
@media(max-width:620px){.stts-course-options{grid-template-columns:1fr}.stts-course-option{padding:16px 18px;min-height:80px}.stts-tutorial-library{padding:18px 14px;margin-top:36px}.stts-video-card{flex-basis:85%}.stts-library-player-nav{gap:8px}.stts-library-player-nav>a{order:3;width:100%;justify-content:center}.stts-library-player-nav .button{padding:12px;font-size:.8rem}.stts-library-controls label{flex-basis:100%}.stts-library-browse p{max-width:170px}}
@media(prefers-reduced-motion:reduce){.stts-video-card>a{transition:none}}