.qd-shell{max-width:1180px;min-height:calc(100vh - var(--app-bar-height,60px));grid-template-columns:minmax(0,1fr);gap:24px;margin:0 auto;padding:clamp(20px,4vw,40px) clamp(16px,4vw,32px) 80px;display:grid}@media (min-width:1024px){.qd-shell{grid-template-columns:minmax(0,1fr) 320px;gap:40px}}.qd-page{min-width:0}.qd-breadcrumb{color:var(--ink-muted);flex-wrap:wrap;align-items:center;gap:4px 6px;margin-bottom:24px;font-size:13px;line-height:1.5;display:flex}.qd-breadcrumb a{color:var(--ink-secondary);text-decoration:none;transition:color .14s}.qd-breadcrumb a:hover{color:var(--ink)}.qd-breadcrumb-sep{color:var(--ink-faint)}.qd-breadcrumb-current{border-radius:var(--radius);background:var(--surface-raised);color:var(--ink);white-space:normal;max-width:100%;padding:2px 8px;font-weight:500;line-height:1.45;display:inline-block}.qd-meta{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:16px;display:flex}.qd-level{text-transform:uppercase;letter-spacing:.04em;white-space:nowrap;border-radius:4px;padding:3px 8px;font-size:.6rem;font-weight:600;line-height:1.4}.qd-category{background:var(--surface-raised);color:var(--ink-secondary);border:1px solid var(--border);border-radius:999px;align-items:center;gap:6px;padding:4px 10px 4px 6px;font-size:12.5px;font-weight:500;line-height:1.4;text-decoration:none;transition:border-color .14s,color .14s,background .14s;display:inline-flex}.qd-category:hover{border-color:var(--border-strong);color:var(--ink);background:var(--surface-hover)}.qd-category img{flex-shrink:0;width:16px;height:16px}.qd-title{font-family:var(--font-heading);letter-spacing:-.02em;color:var(--ink);margin:0 0 28px;font-size:clamp(26px,4.5vw,38px);font-weight:700;line-height:1.18}.qd-answer{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);margin-bottom:16px;padding:clamp(20px,3vw,32px)}.qd-answer-lang-label{border:1px solid var(--border);background:var(--surface);height:20px;color:var(--ink-muted);font-family:var(--font-heading);letter-spacing:.06em;border-radius:999px;align-items:center;margin:0 0 12px;padding:0 7px;font-size:.66rem;font-weight:750;line-height:1;display:inline-flex}.qd-cta{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);text-align:center;margin-top:32px;padding:20px}.qd-cta-text{color:var(--ink-secondary);margin:0 0 12px;font-size:14px;line-height:1.5}.qd-cta-button{background:var(--ink);color:var(--surface);border-radius:var(--radius);align-items:center;gap:6px;padding:10px 20px;font-size:14px;font-weight:600;text-decoration:none;transition:opacity .14s;display:inline-flex}.qd-cta-button:hover{opacity:.9}.qd-sidebar{flex-direction:column;gap:16px;min-width:0;display:flex}@media (min-width:1024px){.qd-sidebar{top:calc(var(--app-bar-height,60px) + 20px);max-height:calc(100vh - var(--app-bar-height,60px) - 40px);scrollbar-width:thin;align-self:start;padding-right:4px;position:sticky;overflow-y:auto}.qd-sidebar::-webkit-scrollbar{width:6px}.qd-sidebar::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}}.qd-rail{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);align-items:center;gap:4px;padding:6px;display:flex;box-shadow:0 1px 2px #0000000a}@media (max-width:1023.98px){.qd-rail{left:50%;bottom:max(14px,env(safe-area-inset-bottom));z-index:20;background:color-mix(in oklab,var(--surface)88%,transparent);-webkit-backdrop-filter:saturate(1.4)blur(8px);border-radius:999px;flex-direction:row;position:fixed;transform:translate(-50%);box-shadow:0 6px 20px #0000001f,0 2px 6px #0000000f}[data-theme=dark] .qd-rail{background:color-mix(in oklab,var(--surface)90%,transparent);box-shadow:0 6px 20px #00000080,0 2px 6px #0000004d}.site-footer{padding-bottom:calc(76px + env(safe-area-inset-bottom))}}.qd-rail-btn{width:40px;height:40px;color:var(--ink-faint);cursor:pointer;border-radius:var(--radius);background:0 0;border:none;justify-content:center;align-items:center;padding:0;transition:background .14s,color .14s,transform .14s;display:inline-flex}@media (max-width:1023.98px){.qd-rail-btn{width:44px;height:44px}}.qd-rail-btn:hover{background:var(--surface-raised);color:var(--ink)}.qd-rail-btn:active{transform:scale(.94)}.qd-rail-btn.is-bookmark.is-active{color:#eab308}.qd-rail-btn.is-learned.is-active{color:#16a34a}[data-theme=dark] .qd-rail-btn.is-learned.is-active{color:#4ade80}.qd-rail-btn.is-upvote.is-active{color:#16a34a}[data-theme=dark] .qd-rail-btn.is-upvote.is-active{color:#4ade80}.qd-rail-btn.is-downvote.is-active{color:#e11d48}[data-theme=dark] .qd-rail-btn.is-downvote.is-active{color:#fb7185}.qd-rail-divider{background:var(--border);flex-shrink:0;width:1px;height:22px;margin:0 4px}.qd-report-modal{width:min(520px,100vw - 32px)}.qd-report-form{flex-direction:column;gap:16px;display:flex}.qd-report-hint{color:var(--ink-muted);margin:0;font-size:.82rem;line-height:1.4}.qd-report-field{flex-direction:column;gap:8px;display:flex}.qd-report-label{color:var(--ink);font-size:.8rem;font-weight:600}.qd-report-reasons{flex-wrap:wrap;gap:6px;display:flex}.qd-report-chip{border:1px solid var(--border);background:var(--surface-raised);color:var(--ink-secondary);cursor:pointer;border-radius:999px;padding:6px 12px;font-size:.82rem;font-weight:500;transition:background .14s,color .14s,border-color .14s}.qd-report-chip:hover{background:var(--surface-hover);color:var(--ink)}.qd-report-chip.is-active{background:var(--accent);color:#fff;border-color:var(--accent)}.qd-report-textarea{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);width:100%;color:var(--ink);font-family:var(--font-body);resize:vertical;min-height:88px;padding:10px 12px;font-size:.9rem;line-height:1.5;transition:border-color .14s}.qd-report-textarea:focus{border-color:var(--accent);outline:none}.qd-report-textarea::placeholder{color:var(--ink-faint)}.qd-report-actions{justify-content:flex-end;gap:8px;margin-top:4px;display:flex}.qd-report-btn{border-radius:var(--radius);font-family:var(--font-body);cursor:pointer;border:1px solid #0000;padding:8px 16px;font-size:.88rem;font-weight:600;transition:background .14s,color .14s,opacity .14s}.qd-report-btn:disabled{opacity:.6;cursor:not-allowed}.qd-report-btn-ghost{color:var(--ink-secondary);border-color:var(--border);background:0 0}.qd-report-btn-ghost:hover:not(:disabled){background:var(--surface-raised);color:var(--ink)}.qd-report-btn-primary{background:var(--accent);color:#fff}.qd-report-btn-primary:hover:not(:disabled){background:var(--accent-hover)}.qd-side-nav{grid-template-columns:1fr 1fr;gap:8px;display:grid}.qd-side-nav-link{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);color:var(--ink-secondary);flex-direction:column;gap:4px;min-width:0;padding:10px 12px;text-decoration:none;transition:border-color .14s,color .14s;display:flex}.qd-side-nav-link:hover{border-color:var(--border-strong);color:var(--ink)}.qd-side-nav-disabled{opacity:.45;cursor:not-allowed;pointer-events:none}.qd-side-nav-direction{letter-spacing:.08em;color:var(--ink-muted);text-transform:uppercase;font-size:10.5px;font-weight:600}.qd-side-nav-text{color:var(--ink);text-overflow:ellipsis;-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:12.5px;line-height:1.35;display:-webkit-box;overflow:hidden}.qd-side-nav-next{text-align:right}.qd-side-related{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:16px}.qd-side-related-heading{font-family:var(--font-heading);letter-spacing:-.005em;color:var(--ink);text-transform:none;margin:0 0 12px;font-size:14px;font-weight:600}.qd-side-related-list{flex-direction:column;gap:2px;margin:0;padding:0;list-style:none;display:flex}.qd-side-related-item a{border-radius:var(--radius);color:var(--ink-secondary);border-left:2px solid #0000;margin:0 -10px;padding:8px 10px 8px 12px;font-size:13px;line-height:1.45;text-decoration:none;transition:color .14s,background .14s;display:block}.qd-side-related-item a:hover{color:var(--ink);background:var(--surface-raised);border-left-color:var(--ink-faint)}