:root{color-scheme:light;font-family:-apple-system,BlinkMacSystemFont,Helvetica Neue,PingFang SC,Microsoft YaHei,Source Han Sans SC,Noto Sans CJK SC,WenQuanYi Micro Hei,sans-serif;--zhihu-blue: #056de8;--zhihu-blue-hover: #175199;--zhihu-blue-bg: rgba(5, 109, 232, .1);--zhihu-bg: #f6f6f6;--zhihu-card: #ffffff;--zhihu-text: #121212;--zhihu-text-2: #444444;--zhihu-meta: #8590a6;--zhihu-border: #ebebeb;--zhihu-border-light: #f0f2f7;--zhihu-red: #dc2626;--zhihu-orange: #faad14;--shadow-card: 0 1px 3px rgba(18, 18, 18, .1);--shadow-hover: 0 2px 8px rgba(18, 18, 18, .12)}*{box-sizing:border-box}body{margin:0;background:var(--zhihu-bg);color:var(--zhihu-text);font-size:15px;line-height:1.67;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font-family:inherit}.zhihu-header{position:sticky;top:0;background:var(--zhihu-card);height:52px;box-shadow:0 1px 3px #1212121a;z-index:100;display:flex;align-items:center;justify-content:center}.zhihu-header-inner{width:1000px;padding:0 16px;display:flex;align-items:center;gap:28px}.zhihu-logo{color:var(--zhihu-blue);font-size:22px;font-weight:800;margin:0;letter-spacing:1px;white-space:nowrap;cursor:default;-webkit-user-select:none;user-select:none}.zhihu-logo span{color:var(--zhihu-text);font-weight:400;font-size:14px;margin-left:6px;letter-spacing:0}.zhihu-nav{display:flex;gap:20px;height:52px;align-items:center;flex:1}.zhihu-nav a{color:var(--zhihu-meta);font-size:15px;padding:0 4px;height:100%;display:flex;align-items:center;position:relative;transition:color .15s}.zhihu-nav a:hover{color:var(--zhihu-text)}.zhihu-nav a.active{color:var(--zhihu-text);font-weight:600}.zhihu-nav a.active:after{content:"";position:absolute;bottom:0;left:0;right:0;height:3px;background:var(--zhihu-blue)}.header-actions{display:flex;gap:10px;align-items:center}.btn-primary{background:var(--zhihu-blue);color:#fff;border:none;border-radius:4px;padding:8px 16px;font-size:14px;cursor:pointer;transition:background .15s;white-space:nowrap}.btn-primary:hover{background:var(--zhihu-blue-hover)}.btn-secondary{background:var(--zhihu-blue-bg);color:var(--zhihu-blue);border:none;border-radius:4px;padding:8px 16px;font-size:14px;cursor:pointer;transition:background .15s;white-space:nowrap}.btn-secondary:hover{background:#056de826}.btn-ghost{background:transparent;color:var(--zhihu-meta);border:1px solid var(--zhihu-border);border-radius:4px;padding:6px 14px;font-size:13px;cursor:pointer;transition:all .15s}.btn-ghost:hover{color:var(--zhihu-blue);border-color:var(--zhihu-blue)}.vote-btn{display:inline-flex;align-items:center;gap:6px;background:var(--zhihu-blue-bg);color:var(--zhihu-blue);border:none;border-radius:4px;height:32px;padding:0 12px;font-size:14px;font-weight:500;cursor:default;-webkit-user-select:none;user-select:none}.zhihu-main{display:flex;justify-content:center;padding:10px 16px 40px}.zhihu-content-wrapper{width:1000px;max-width:100%}.cards{display:flex;flex-direction:column}.card{display:block;background:var(--zhihu-card);border-radius:4px;padding:16px 20px;box-shadow:var(--shadow-card);margin-bottom:10px;transition:box-shadow .2s}.card:hover{box-shadow:var(--shadow-hover)}.card h2,.card h3{margin:0 0 8px;font-size:18px;font-weight:600;line-height:1.5;color:var(--zhihu-text)}.card h2:hover,.card h3:hover{color:var(--zhihu-blue-hover)}.card-excerpt{color:var(--zhihu-text-2);margin:0 0 4px;font-size:15px;line-height:1.67;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.card-author{display:flex;align-items:center;gap:8px;margin-bottom:10px;font-size:14px}.card-author img{width:24px;height:24px;border-radius:3px;object-fit:cover}.card-author .author-name{font-weight:600;color:var(--zhihu-text)}.card-author .author-headline{color:var(--zhihu-meta);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.card-footer{display:flex;align-items:center;gap:20px;margin-top:12px;font-size:14px;color:var(--zhihu-meta)}.card-footer .stat{display:inline-flex;align-items:center;gap:5px;white-space:nowrap}.card-footer .stat-num{font-variant-numeric:tabular-nums}.card-footer .footer-right{margin-left:auto;font-size:13px}.tab-bar{display:flex;gap:24px;align-items:center;background:var(--zhihu-card);border-radius:4px;box-shadow:var(--shadow-card);padding:0 20px;height:48px;margin-bottom:10px}.tab-bar .tab{height:100%;display:flex;align-items:center;font-size:15px;color:var(--zhihu-meta);cursor:pointer;position:relative;background:none;border:none;padding:0 2px}.tab-bar .tab:hover{color:var(--zhihu-text)}.tab-bar .tab.active{color:var(--zhihu-text);font-weight:600}.tab-bar .tab.active:after{content:"";position:absolute;bottom:0;left:0;right:0;height:3px;background:var(--zhihu-blue);border-radius:2px}.tab-bar .tab-right{margin-left:auto;display:flex;align-items:center;gap:8px}.sort-chip{font-size:13px;padding:3px 10px;border-radius:20px;border:none;cursor:pointer;background:var(--zhihu-border-light);color:var(--zhihu-text-2)}.sort-chip.active{background:var(--zhihu-blue-bg);color:var(--zhihu-blue);font-weight:500}.search-input{padding:7px 14px 7px 34px;min-width:240px;border:1px solid var(--zhihu-border);border-radius:20px;font-size:14px;outline:none;background:var(--zhihu-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%238590a6' stroke-width='2.5'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='M21 21l-4.3-4.3'/%3E%3C/svg%3E") no-repeat 12px center;transition:border-color .15s,background-color .15s}.search-input:focus{border-color:var(--zhihu-blue);background-color:#fff}.search-input::placeholder{color:var(--zhihu-meta)}.question-title{font-size:22px;font-weight:600;line-height:1.4;margin:4px 0 16px;color:var(--zhihu-text)}.author-card{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--zhihu-border-light);margin-bottom:20px}.author-card img{width:40px;height:40px;border-radius:4px;object-fit:cover}.author-card .author-info{flex:1;min-width:0}.author-card .author-name{font-weight:600;font-size:15px;color:var(--zhihu-text)}.author-card .author-headline{font-size:13px;color:var(--zhihu-meta);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.detail-tag{display:inline-flex;align-items:center;padding:2px 8px;border-radius:4px;font-size:13px;margin-right:8px;background:var(--zhihu-border-light);color:var(--zhihu-meta)}.detail-tag.blue{background:var(--zhihu-blue-bg);color:var(--zhihu-blue)}.detail-tag.red{background:#dc262614;color:var(--zhihu-red)}.detail-tag.orange{background:#faad141a;color:var(--zhihu-orange)}.edit-time{color:var(--zhihu-meta);font-size:14px;margin:20px 0 12px}.action-bar{display:flex;align-items:center;gap:16px;padding:12px 0;border-top:1px solid var(--zhihu-border-light);border-bottom:1px solid var(--zhihu-border-light);font-size:14px;color:var(--zhihu-meta)}.action-bar .stat{display:inline-flex;align-items:center;gap:5px}.action-bar .stat-num{font-variant-numeric:tabular-nums;color:var(--zhihu-text-2);font-weight:500}.comment-section-title{font-size:18px;font-weight:600;margin:24px 0 0;display:flex;align-items:center;gap:12px;flex-wrap:wrap}.comment{display:flex;gap:10px;padding:14px 0;border-bottom:1px solid var(--zhihu-border-light)}.comment:last-child{border-bottom:none}.comment-avatar{width:32px;height:32px;border-radius:3px;object-fit:cover;flex-shrink:0;margin-top:2px}.comment-avatar-placeholder{width:32px;height:32px;border-radius:3px;background:var(--zhihu-border-light);color:var(--zhihu-meta);display:flex;align-items:center;justify-content:center;font-size:13px;flex-shrink:0}.comment-body{flex:1;min-width:0}.comment-head{display:flex;align-items:center;gap:8px;font-size:14px;flex-wrap:wrap}.comment-head .name{font-weight:600;color:var(--zhihu-text)}.comment-head .time,.comment-head .loc{color:var(--zhihu-meta);font-size:13px}.comment-badge{font-size:12px;padding:1px 6px;border-radius:3px;background:var(--zhihu-blue-bg);color:var(--zhihu-blue)}.comment-badge.top{background:#ff4d4f14;color:#ff4d4f}.comment-badge.featured{background:#faad141a;color:var(--zhihu-orange)}.comment-badge.deleted{background:#dc262614;color:var(--zhihu-red)}.comment-reply-to{color:var(--zhihu-meta);font-size:13px}.comment-reply-to strong{color:var(--zhihu-blue-hover);font-weight:500}.comment-content{margin:6px 0;font-size:15px;line-height:1.67;color:var(--zhihu-text);word-wrap:break-word}.comment-content img{max-width:100%}.comment.is-deleted .comment-content{color:var(--zhihu-meta)}.comment-actions{display:flex;gap:16px;font-size:13px;color:var(--zhihu-meta)}.comment-actions .likes{display:inline-flex;align-items:center;gap:4px}.comment-children{margin-left:16px;padding-left:14px;border-left:2px solid var(--zhihu-border-light)}.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin-bottom:20px}.stat-card{background:var(--zhihu-card);border-radius:4px;box-shadow:var(--shadow-card);padding:18px 16px;text-align:center}.stat-card .num{font-size:26px;font-weight:700;color:var(--zhihu-blue);font-variant-numeric:tabular-nums}.stat-card .label{font-size:13px;color:var(--zhihu-meta);margin-top:4px}.timeline{list-style:none;padding:0;margin:0}.timeline li{padding:12px 0;border-bottom:1px solid var(--zhihu-border-light);display:flex;align-items:baseline;gap:10px;font-size:14px}.timeline li:last-child{border-bottom:none}.event-pill{flex-shrink:0;font-size:12px;padding:2px 8px;border-radius:3px;background:var(--zhihu-blue-bg);color:var(--zhihu-blue);font-weight:500}.event-time{color:var(--zhihu-meta);font-size:13px;margin-left:auto;white-space:nowrap}.meta{display:flex;gap:16px;color:var(--zhihu-meta);font-size:14px;margin-bottom:16px;align-items:center;flex-wrap:wrap}.meta-pill{background:var(--zhihu-blue-bg);color:var(--zhihu-blue);padding:4px 10px;border-radius:4px;font-weight:500;display:inline-flex;align-items:center;gap:4px}.content-body{width:100%;overflow-x:auto;word-wrap:break-word;font-size:15px;color:var(--zhihu-text)}.content-body img{max-width:100%;height:auto;border-radius:4px;display:block;margin:12px 0}.content-body table{max-width:100%;overflow-x:auto;display:block;border-collapse:collapse;margin:16px 0}.content-body table th,.content-body table td{border:1px solid var(--zhihu-border);padding:8px 12px}.content-body blockquote{margin:12px 0;padding:10px 16px;border-left:3px solid var(--zhihu-border);background:var(--zhihu-bg);color:var(--zhihu-text-2)}.content-body a{color:var(--zhihu-blue)}.content-body pre{background:var(--zhihu-bg);padding:12px;border-radius:4px;overflow-x:auto}.sync-dropdown{position:relative;display:inline-block}.sync-dropdown-content{display:none;position:absolute;right:0;background:var(--zhihu-card);min-width:150px;box-shadow:0 8px 24px #1212121f;z-index:100;border-radius:4px;border:1px solid var(--zhihu-border);overflow:hidden;padding:4px 0}.sync-dropdown-content button{color:var(--zhihu-text-2);padding:10px 16px;display:block;width:100%;border:none;background:none;text-align:left;cursor:pointer;font-size:14px}.sync-dropdown-content button:hover{background:var(--zhihu-bg);color:var(--zhihu-blue)}.sync-dropdown:hover .sync-dropdown-content{display:block}.toast{position:fixed;top:66px;left:50%;transform:translate(-50%);background:var(--zhihu-text);color:#fff;padding:10px 20px;border-radius:6px;font-size:14px;z-index:1000;box-shadow:0 4px 16px #0003;animation:toast-in .25s ease-out}@keyframes toast-in{0%{opacity:0;transform:translate(-50%) translateY(-8px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.back-fab{position:fixed;left:40px;top:80px;display:flex;align-items:center;gap:6px;padding:9px 18px;border-radius:20px;background:var(--zhihu-card);border:1px solid var(--zhihu-border-light);box-shadow:var(--shadow-card);color:var(--zhihu-text-2);font-size:14px;font-weight:500;cursor:pointer;z-index:90;transition:box-shadow .15s}.back-fab:hover{box-shadow:var(--shadow-hover);color:var(--zhihu-blue)}.empty-state{text-align:center;padding:60px 20px;color:var(--zhihu-meta);font-size:14px}.loading-state{text-align:center;padding:20px;color:var(--zhihu-meta);font-size:14px}.version-list{list-style:none;padding:0;margin:0;font-size:13px;color:var(--zhihu-meta)}.version-list li{padding:6px 0;border-bottom:1px dashed var(--zhihu-border-light)}.version-list li:last-child{border-bottom:none}.version-hash{font-family:SF Mono,Consolas,monospace;font-size:12px}@media(max-width:1040px){.zhihu-header-inner,.zhihu-content-wrapper{width:100%}.back-fab{left:12px;top:66px;padding:7px 14px}}@media(max-width:640px){.zhihu-nav{gap:12px}.zhihu-nav a{font-size:14px}.header-actions{display:none}.back-fab{position:static;margin-bottom:10px}.card{padding:14px 16px}}@media(max-width:640px){.tab-bar{flex-wrap:wrap;gap:8px;padding:8px 12px}.tab-bar .tab{white-space:nowrap;padding:6px 10px}.tab-bar .tab-right{margin-left:0;width:100%}.search-input{min-width:0;flex:1 1 auto}}