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var(--line)}.rail-button{display:inline-grid;place-items:center;width:38px;height:38px;min-height:0;padding:0;border:none;border-radius:8px;background:none;color:var(--text-2);text-decoration:none}.rail-button:hover,.rail-button.on{background:var(--paper);color:var(--text)}.rail-brand{margin-bottom:8px}.rail-brand img{display:block}.rail-mode{font-size:.85rem;font-weight:700;border:1px solid var(--line-strong)}.rail-spacer{flex:1}.rail-account .icon-button{width:38px;height:38px;min-width:0;padding:0}.menu-pop.side{left:calc(100% + 8px);top:0}.menu-pop.side.up{top:auto;bottom:0}.rail .menu-pop{max-width:280px;max-height:70vh;overflow-y:auto}.rail .menu-pop button{overflow:hidden;text-overflow:ellipsis}.rail .menu-pop button:disabled:first-child{font-size:.78rem;min-height:30px}.sidebar-top .brand img{height:30px;width:auto}@media (max-width: 760px){.rail{display:none}}.course-head{display:flex;align-items:flex-start;gap:8px;margin:4px 0 16px}.course-head .titles{flex:1 1 auto;min-width:0}.course-head h1{margin:0 0 .15em}.course-head .meta{font-size:.9rem;color:var(--muted)}.share-popover>button{min-height:36px}.share-card{width:min(380px,86vw);padding:14px 16px;display:grid;gap:10px}.share-card label.check{margin:0;font-weight:600}.share-card .row{margin:0}.share-card .row input{flex:1;min-width:0;font-size:.8rem}.share-card p{margin:0}.course-ask{margin-bottom:20px}.course-ask .ask-form input{min-height:48px;font-size:1.02rem;border-radius:12px;padding:.6em 1em}.course-ask>p{margin:6px 4px 0}.q-rows{list-style:none;margin:0;padding:0}.q-rows li{border-bottom:1px solid var(--line)}.q-rows li.is-hidden{opacity:.55}.q-row{display:flex;gap:12px;align-items:center;padding:12px 8px;color:var(--text);text-decoration:none;border-radius:6px}.q-row:hover{background:var(--bg);color:var(--text)}.q-row-main{flex:1;min-width:0;display:grid;gap:2px}.q-row-title{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.q-row-sub{font-size:.85rem;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.q-row-side{display:flex;align-items:center;gap:6px;flex:none}.q-row-date{font-size:.8rem;color:var(--muted);white-space:nowrap}.question-page .question{border:none;padding:0}.question-page .q-title{font-size:1.4rem;font-weight:700}