a{color:var(--link)}a:hover{color:var(--link-hover)}.aa-shell{min-height:100dvh;display:flex;flex-direction:column}.aa-h1,.aa-h2,.aa-h3,.aa-h4,.aa-h5{margin:0;color:var(--text-strong)}.aa-h1{font-size:clamp(1.75rem,1.3rem + 1.4vw,2.25rem);line-height:1.15;letter-spacing:-.025em;font-weight:700}.aa-h2{font-size:clamp(1.5rem,1.25rem + .8vw,1.875rem);line-height:1.2;letter-spacing:-.022em;font-weight:700}.aa-h3{font-size:clamp(1.25rem,1.1rem + .4vw,1.375rem);line-height:1.3;letter-spacing:-.015em;font-weight:600}.aa-h4{font-size:18px;line-height:1.35;letter-spacing:-.01em;font-weight:600}.aa-h5{font-size:16px;line-height:1.4;font-weight:600}.aa-h1:focus,.aa-h2:focus,.aa-h3:focus{outline:none}.aa-body{margin:0;color:var(--color-text-body);max-width:68ch;text-wrap:pretty}.aa-small{font-size:15px;line-height:1.55}.aa-muted{margin:0;color:var(--text-muted)}.aa-strong{margin:0;color:var(--text-strong);font-weight:600}.aa-eyebrow{margin:0;font-family:var(--font-mono);font-size:13px;letter-spacing:var(--tracking-mono);color:var(--text-muted)}.aa-stack{display:flex;flex-direction:column}.aa-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px}.aa-card{background:var(--surface-card);border:1px solid var(--border-hairline);border-radius:var(--radius-lg)}.aa-pend{display:inline-flex;align-items:center;min-height:28px;padding:2px 10px;border:1px dashed var(--border-strong);border-radius:6px;background:var(--neutral-25);font-family:var(--font-mono);font-size:12px;line-height:1.4;letter-spacing:var(--tracking-mono);color:var(--text-muted)}.aa-topnav--wide .lh-topnav__inner{max-width:1440px}.aa-mcta{padding-top:8px}.aa-page{flex:1;padding:48px 0 96px;position:relative}.aa-page--grid:before{content:"";position:absolute;left:0;right:0;top:0;height:420px;background-image:linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);background-size:64px 64px;background-position:-1px -1px;-webkit-mask-image:linear-gradient(180deg,#000 20%,transparent);mask-image:linear-gradient(180deg,#000 20%,transparent);pointer-events:none}.aa-wrap{max-width:1024px;margin:0 auto;padding:0 32px}.aa-wrap--sm{max-width:784px}.aa-pagehead{gap:8px;margin-bottom:32px}.aa-auth{position:relative;max-width:480px;margin:0 auto;padding:0 20px;display:flex;flex-direction:column;gap:16px}.aa-auth--wide{max-width:720px}.aa-authcard{padding:32px;display:flex;flex-direction:column;gap:20px;box-shadow:var(--shadow-md)}.aa-form{display:flex;flex-direction:column;gap:18px}.aa-links{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:15px}.aa-confirm{padding:32px;box-shadow:var(--shadow-md)}.aa-confirm__head{display:grid;grid-template-columns:52px minmax(0,1fr);gap:20px;align-items:start}.aa-status{width:52px;height:52px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;border:1px solid;flex:none}.aa-status--success{color:var(--status-success);background:var(--status-success-bg);border-color:var(--status-success-border)}.aa-status--warning{color:var(--status-warning);background:var(--status-warning-bg);border-color:var(--status-warning-border)}.aa-status--danger{color:var(--status-danger);background:var(--status-danger-bg);border-color:var(--status-danger-border)}.aa-status--info{color:var(--status-info);background:var(--status-info-bg);border-color:var(--status-info-border)}.aa-status--neutral{color:var(--text-muted);background:var(--neutral-50);border-color:var(--border-hairline)}.aa-summary{margin:28px 0 0;border-top:1px solid var(--border-hairline)}.aa-summary>div{display:grid;grid-template-columns:180px minmax(0,1fr);gap:4px 16px;padding:12px 0;border-bottom:1px solid var(--border-hairline);align-items:center}.aa-summary>div:last-child{border-bottom:0;padding-bottom:0}.aa-summary dt{font-size:14px;color:var(--text-muted)}.aa-summary dd{margin:0;color:var(--color-text-body);overflow-wrap:anywhere}.aa-summary--flat{margin-top:8px;border-top:0}.aa-next{padding:28px 32px;display:flex;flex-direction:column;gap:16px}.aa-next__grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px}.aa-next__opt{display:flex;flex-direction:column;gap:10px;align-items:flex-start}.aa-next__opt+.aa-next__opt{border-left:1px solid var(--border-hairline);padding-left:28px}.aa-inline-btn{padding:0;border:0;background:none;font:inherit;color:var(--link);text-decoration:underline;text-underline-offset:2px;cursor:pointer}.aa-inline-btn:hover{color:var(--link-hover)}.aa-ok{margin:0;display:flex;gap:6px;align-items:flex-start;color:var(--green-700)}.aa-ok svg{margin-top:3px;flex:none}.aa-courses{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:20px}.aa-ccard{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);background:var(--surface-card);border:1px solid var(--border-hairline);border-radius:var(--radius-lg);overflow:hidden;transition:border-color var(--duration-base) var(--ease-standard),box-shadow var(--duration-base) var(--ease-standard)}.aa-ccard:hover{border-color:var(--border-default);box-shadow:var(--shadow-md)}.aa-ccard__media{min-height:100%;border-right:1px solid var(--border-hairline)}.aa-ccard__body{padding:28px;display:flex;flex-direction:column;gap:14px;min-width:0}.aa-meta{display:flex;flex-wrap:wrap;margin:0;padding:0;list-style:none;font-family:var(--font-mono);font-size:13px;letter-spacing:var(--tracking-mono);color:var(--text-muted)}.aa-meta li+li:before{content:"·";padding:0 8px;color:var(--neutral-400)}.aa-last{margin:0}.aa-ccard__foot{margin-top:6px;display:flex;flex-wrap:wrap;gap:12px}.aa-empty{padding:32px;display:flex;flex-direction:column;gap:14px;align-items:flex-start}.aa-sect{padding:24px 28px;margin-bottom:16px}.aa-sect__head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px}.aa-owned{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px 20px}.aa-help{margin-top:32px;display:flex;flex-direction:column;gap:14px}.aa-help__grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px}.aa-help__item{padding:22px;display:flex;flex-direction:column;gap:10px;align-items:flex-start}.aa-help__item--plain{background:transparent;border-style:dashed;border-color:var(--border-default)}.aa-help__ic{color:var(--text-brand)}.aa-help__ic--muted{color:var(--text-muted)}.aa-class{flex:1;width:100%;max-width:1440px;margin:0 auto;padding:20px 32px 80px;display:grid;grid-template-columns:minmax(0,1fr) 384px;gap:32px;align-items:start}.aa-class__main{min-width:0}.aa-crumb{display:flex;align-items:center;gap:8px;min-width:0;margin-bottom:16px;font-size:14px;color:var(--text-muted)}.aa-crumb a{display:inline-flex;align-items:center;gap:6px;min-height:32px;color:var(--color-text-body);text-decoration:none;font-weight:500;border-radius:4px;flex:none}.aa-crumb a:hover{color:var(--text-strong);text-decoration:underline}.aa-crumb__cur{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.aa-player{box-shadow:var(--shadow-lg)}.aa-player iframe{position:absolute;inset:0;width:100%;height:100%;border:0;display:block}.aa-player__msg{gap:8px}.aa-player__msg p{max-width:44ch}.aa-player__tag{display:inline-flex;align-items:center;height:22px;padding:0 8px;border:1px solid rgb(255 255 255 / .28);border-radius:4px;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--cyan-300)}.aa-player .aa-player__t{font-size:16px;font-weight:600;color:#fff}.aa-player .aa-player__mono{font-family:var(--font-mono);font-size:12px;letter-spacing:var(--tracking-mono);color:#ffffffb8}.aa-lhead{margin-top:24px;display:flex;flex-direction:column;gap:8px}.aa-lhead__meta{display:flex;flex-wrap:wrap;align-items:center;gap:6px 12px;font-family:var(--font-mono);font-size:13px;letter-spacing:var(--tracking-mono);color:var(--text-muted)}.aa-lhead__t{text-wrap:balance}.aa-lhead__mod{margin:0;color:var(--color-text-body)}.aa-ctrls{margin-top:20px;padding:16px 0;border-top:1px solid var(--border-hairline);border-bottom:1px solid var(--border-hairline);display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:12px;align-items:center}.aa-ctrls__prev{display:flex;justify-content:flex-start}.aa-ctrls__mid{display:flex;justify-content:center}.aa-ctrls__next{display:flex;justify-content:flex-end}.aa-donebox{display:inline-flex;align-items:center;gap:10px;height:44px;padding:0 4px 0 14px;border:1px solid var(--status-success-border);border-radius:var(--radius-sm);background:var(--status-success-bg)}.aa-donebox__s{display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:600;color:var(--green-700);white-space:nowrap}.aa-donebox__undo{height:36px;padding:0 12px;border:0;border-radius:4px;background:transparent;font:inherit;font-size:14px;font-weight:600;color:var(--text-strong);text-decoration:underline;text-underline-offset:2px;cursor:pointer}.aa-donebox__undo:hover{background:var(--surface-card)}.aa-only-mobile{display:none}.aa-count{font-family:var(--font-mono);font-size:13px;font-weight:400;letter-spacing:var(--tracking-mono);color:var(--text-muted)}.aa-about{margin-top:28px;display:flex;flex-direction:column;gap:10px;align-items:flex-start}.aa-side{position:sticky;top:84px;max-height:calc(100dvh - 104px);display:flex;flex-direction:column;background:var(--surface-card);border:1px solid var(--border-hairline);border-radius:var(--radius-lg);overflow:hidden}.aa-side__head{padding:18px 20px 16px;border-bottom:1px solid var(--border-hairline);display:flex;flex-direction:column;gap:12px}.aa-side__course{margin:0;font-size:15px;font-weight:600;color:var(--text-strong)}.aa-side__body{flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain}.aa-curr{border:0;border-radius:0}.aa-curr .lh-acc__btn{grid-template-columns:auto minmax(0,1fr) auto;gap:12px;padding:14px 16px}.aa-curr .lh-acc__title{font-size:15px}.aa-curr__sub{display:flex;align-items:center;gap:4px;margin-top:3px;font-family:var(--font-mono);font-size:12px;letter-spacing:var(--tracking-mono);color:var(--text-muted);font-weight:400}.aa-curr__sub--done{color:var(--green-700)}.aa-curr__list{padding:0 8px 10px}.aa-curr .lh-lesson{padding:9px 10px;gap:10px}.aa-curr .lh-lesson__title{font-size:14.5px}.aa-lesson--curdone .lh-lesson__icon{color:var(--status-success)}.aa-scrim{position:fixed;inset:0;z-index:var(--z-overlay);background:#1213177a;display:flex;align-items:center;justify-content:center;padding:20px}.aa-dlg{width:100%;max-width:520px;max-height:calc(100dvh - 40px);background:var(--surface-card);border-radius:20px;box-shadow:var(--shadow-xl);display:flex;flex-direction:column;overflow:hidden;outline:none}.aa-dlg__head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 12px 12px 24px;border-bottom:1px solid var(--border-hairline)}.aa-dlg__title{margin:0;font-size:18px;font-weight:600;color:var(--text-strong)}.aa-dlg__body{padding:20px 24px 24px;overflow-y:auto}.aa-scrim--sheet{align-items:flex-end;padding:0}.aa-dlg--sheet{max-width:720px;height:88dvh;max-height:88dvh;border-radius:16px 16px 0 0}.aa-dlg--sheet .aa-dlg__head{padding-left:20px}.aa-dlg--sheet .aa-dlg__body{padding:0;flex:1;min-height:0;display:flex;flex-direction:column;overflow:hidden}.aa-sheet__prog{padding:14px 20px;border-bottom:1px solid var(--border-hairline)}.aa-sheet__list{flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain;padding-bottom:env(safe-area-inset-bottom)}.aa-foot{border-top:1px solid var(--border-hairline);background:var(--surface-card)}.aa-foot__in{max-width:1440px;margin:0 auto;padding:20px 32px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;font-size:14px;color:var(--text-muted)}.aa-foot b{color:var(--text-strong);letter-spacing:-.02em}@media(max-width:1023px){.aa-class{grid-template-columns:minmax(0,1fr);padding:16px 32px 64px}.aa-side{display:none}.aa-only-mobile{display:block;margin-top:16px}}@media(max-width:767px){.aa-page{padding:28px 0 64px}.aa-wrap{padding:0 20px}.aa-class{padding:12px 20px 56px}.aa-authcard,.aa-confirm,.aa-empty,.aa-next{padding:24px}.aa-confirm__head{grid-template-columns:minmax(0,1fr);gap:16px}.aa-summary>div{grid-template-columns:minmax(0,1fr);gap:2px}.aa-next__grid{grid-template-columns:minmax(0,1fr);gap:20px}.aa-next__opt+.aa-next__opt{border-left:0;padding-left:0;border-top:1px solid var(--border-hairline);padding-top:20px}.aa-help__grid{grid-template-columns:minmax(0,1fr)}.aa-sect{padding:20px}.aa-ccard{grid-template-columns:minmax(0,1fr)}.aa-ccard__media{min-height:0;aspect-ratio:16/9;border-right:0;border-bottom:1px solid var(--border-hairline)}.aa-ccard__body{padding:20px}.aa-ccard__foot .lh-btn{width:100%}}@media(max-width:639px){.aa-player{border-radius:12px}.aa-crumb__cur,.aa-crumb>span[aria-hidden]{display:none}.aa-ctrls{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:10px}.aa-ctrls__mid{grid-column:1/-1;order:-1}.aa-ctrls .lh-btn{width:100%}.aa-ctrls__mid>*{width:100%}.aa-donebox{justify-content:space-between}.aa-player__msg{padding:16px}.aa-player .aa-player__t{font-size:15px}.aa-player__msg p:not(.aa-player__t):not(.aa-player__mono){font-size:13px}.aa-dlg__body{padding:16px 20px 20px}}.aa-shell .lh-lesson{width:100%}.aa-shell .lh-lesson>span:nth-child(2){min-width:0}.aa-shell .lh-lesson__title{overflow-wrap:anywhere}.aa-shell .lh-lesson:disabled{cursor:not-allowed;opacity:.65}.aa-shell .aa-topnav{position:sticky;top:0;z-index:30}.aa-shell .aa-cover{width:100%;height:100%;object-fit:cover}@media(max-width:767px){.aa-foot__in{padding-left:20px;padding-right:20px}}.aa-dlg .lh-lesson{width:100%}.aa-dlg .lh-lesson>span:nth-child(2){min-width:0}.aa-dlg .lh-lesson:disabled{cursor:not-allowed;opacity:.65}.aa-donebox__undo{min-height:44px}.aa-donebox{height:auto;min-height:44px}