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img{object-fit:cover;width:100%;height:100%;display:block}.toggle{align-items:center;gap:var(--space-2);font-size:var(--size-small);cursor:pointer;display:inline-flex}.toast{z-index:100;border-radius:var(--radius-card);background:var(--bg-overlay);border:var(--border-w) solid var(--border-default);box-shadow:var(--shadow-overlay);font-size:var(--size-small);animation:rise .3s var(--ease-spring) both;max-width:360px;padding:12px 16px;position:fixed;bottom:24px;right:24px}.toast.err{border-color:var(--loss-line)}@media (width<=1100px){.app{grid-template-columns:var(--rail-w-compact) minmax(0, 1fr)}.brand-name,.nav a span,.nav-group,.who-text{display:none}.nav a{justify-content:center;padding:0}.brand{padding:var(--space-1) 0;justify-content:center}.who{padding:var(--space-2);flex-direction:column;justify-content:center}.lesson-layout{grid-template-columns:minmax(0,1fr) 320px}}@media (width<=900px){.lesson-layout,.course-hero{grid-template-columns:minmax(0,1fr)}.outline{max-height:none;position:static}.form-grid{grid-template-columns:1fr}}@media (width<=720px){.app{display:block}.rail{display:none}.mob-head{align-items:center;gap:var(--space-3);z-index:25;background:var(--mob-bar-bg);-webkit-backdrop-filter:blur(14px);border-bottom:var(--border-w) solid var(--border-subtle);padding:10px 16px;display:flex;position:sticky;top:0}.mob-head img{width:28px;height:28px}.mob-head b{font-family:var(--font-display);font-size:var(--size-value);flex:1;font-weight:600}.mob-head button{color:var(--text-muted);background:0 0;border:0;padding:6px;display:grid}.mob-head button svg{fill:none;stroke:currentColor;stroke-width:1.7px;stroke-linecap:round;stroke-linejoin:round;width:18px;height:18px}.topbar{display:none}.tabbar{z-index:25;padding:6px 8px calc(6px + env(safe-area-inset-bottom));background:var(--mob-bar-bg);-webkit-backdrop-filter:blur(14px);border-top:var(--border-w) solid var(--border-subtle);display:flex;position:fixed;bottom:0;left:0;right:0}.tabbar a{font-size:var(--size-axis);color:var(--text-muted);border-radius:10px;flex-direction:column;flex:1;align-items:center;gap:2px;padding:6px 0;display:flex}.tabbar a.on{color:var(--accent-light);background:var(--tab-on-fill)}.page{padding:var(--space-5) 16px 96px}.greeting h1{font-size:var(--size-mob-title)}.continue{padding:var(--space-5);grid-template-columns:1fr}.continue .btn{width:100%}.grid{grid-template-columns:1fr}.player{border-radius:var(--radius-card);margin:0 -4px}.vol{display:none}.auth{grid-template-columns:1fr}.auth-stage{border-right:0;border-bottom:var(--border-w) solid var(--border-subtle);padding:32px 20px 28px}.auth-stage img{width:64px;height:64px;margin-bottom:var(--space-4)}.auth-stage h1{font-size:28px}.auth-stage .tags,.auth-stage p{display:none}.auth-form-wrap{place-items:start center;padding:24px 16px}.table:not(.keep) th:nth-child(n+4),.table:not(.keep) td:nth-child(n+4){display:none}.cover-thumb{width:120px}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:1ms!important;animation-duration:1ms!important;animation-iteration-count:1!important}}.pill svg{fill:none;stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;width:12px;height:12px}.materials svg,.upload-box svg{fill:none;stroke:currentColor;stroke-width:1.8px;stroke-linecap:round;stroke-linejoin:round;flex:none;width:16px;height:16px}.upload-box svg.up-ic{width:28px;height:28px;color:var(--accent);margin-bottom:8px}