:root{--bg-color: #f1f5f9;--card-bg: #ffffff;--text-primary: #0f172a;--text-secondary: #64748b;--accent: #0f766e;--accent-light: #ccfbf1;--border: #e2e8f0;--like-color: #f43f5e;--like-bg: #ffe4e6;--nav-bg: rgba(255, 255, 255, .85)}body{background-color:var(--bg-color);margin:0;padding:0;font-family:Inter,sans-serif;-webkit-tap-highlight-color:transparent}@media (max-width: 768px){.site-header{display:none!important}}.community-app{padding-bottom:80px;padding-top:130px;max-width:600px;margin:0 auto;min-height:100vh}@media (max-width: 768px){.community-app{padding-top:110px}}.app-top-bar{position:fixed;top:76px;left:0;right:0;background:var(--nav-bg);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);z-index:100;border-bottom:1px solid var(--border);padding:10px 0;display:flex;flex-direction:column;align-items:center}@media (max-width: 768px){.app-top-bar{top:0}}.app-search-box{display:flex;align-items:center;background:#e2e8f0;border-radius:999px;padding:8px 16px;margin:0 16px 12px;width:calc(100% - 32px);max-width:568px;color:var(--text-secondary)}.app-search-box input{border:none;background:transparent;width:100%;margin-left:10px;font-size:15px;color:var(--text-primary);outline:none}.app-chips-container{width:100%;overflow-x:auto;scrollbar-width:none}.app-chips-container::-webkit-scrollbar{display:none}.app-chips{display:flex;gap:10px;padding:0 16px;width:max-content}.app-chip{padding:8px 16px;background:#f1f5f9;border:1px solid var(--border);border-radius:999px;font-size:14px;font-weight:600;color:var(--text-secondary);cursor:pointer;transition:all .2s ease;white-space:nowrap}.app-chip.active{background:var(--text-primary);color:#fff;border-color:var(--text-primary)}.app-feed{display:flex;flex-direction:column;gap:12px;padding:0 16px}.feed-card{background:var(--card-bg);border-radius:20px;padding:16px;box-shadow:0 2px 10px #00000008;display:flex;flex-direction:column;gap:12px;cursor:pointer;transition:transform .1s ease}.feed-card:active{transform:scale(.98)}.card-header{display:flex;justify-content:space-between;align-items:center}.card-author-info{display:flex;align-items:center;gap:12px}.avatar{width:42px;height:42px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:16px}.author-text{display:flex;flex-direction:column}.author-name{font-weight:700;font-size:15px;color:var(--text-primary)}.time-ago{font-size:13px;color:var(--text-secondary)}.card-category{font-size:12px;font-weight:700;color:var(--accent);background:var(--accent-light);padding:4px 10px;border-radius:6px}.card-body{display:flex;flex-direction:column;gap:8px}.card-title{font-size:17px;font-weight:700;color:var(--text-primary);margin:0;line-height:1.3}.card-content-snippet{font-size:14px;color:#475569;line-height:1.5;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.card-tags{display:flex;flex-wrap:wrap;gap:6px}.card-tag{color:#3b82f6;font-size:13px;font-weight:500}.card-footer{display:flex;justify-content:flex-start;gap:20px;border-top:1px solid var(--border);padding-top:12px;margin-top:4px}.action-btn{display:flex;align-items:center;gap:6px;background:none;border:none;padding:6px 12px;border-radius:999px;font-size:14px;font-weight:600;color:var(--text-secondary);cursor:pointer;transition:all .2s ease}.action-btn svg{width:20px;height:20px}.action-btn.comment:hover{color:#3b82f6;background:#eff6ff}.action-btn.like.liked{color:var(--like-color)}.action-btn.like.liked svg{fill:var(--like-color);stroke:var(--like-color);animation:heartbeat .3s ease-in-out}@keyframes heartbeat{0%{transform:scale(1)}50%{transform:scale(1.3)}to{transform:scale(1)}}.app-fab{position:fixed;bottom:90px;right:20px;width:60px;height:60px;border-radius:30px;background:linear-gradient(135deg,#0f766e,#115e59);color:#fff;border:none;box-shadow:0 8px 24px #0f766e66;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:90;transition:transform .2s ease,box-shadow .2s ease}.app-fab:active{transform:scale(.9)}@media (min-width: 768px){.app-fab{right:calc(50vw - 280px);bottom:40px}}.app-bottom-nav{position:fixed;bottom:0;left:0;right:0;height:65px;background:var(--nav-bg);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-top:1px solid var(--border);display:flex;justify-content:space-around;align-items:center;z-index:100;padding-bottom:env(safe-area-inset-bottom)}@media (min-width: 769px){.app-bottom-nav{display:none}}.nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;color:#94a3b8;text-decoration:none;flex:1;height:100%}.nav-item span{font-size:11px;font-weight:600}.nav-item.active{color:var(--text-primary)}.nav-item.active svg{stroke:var(--text-primary);stroke-width:2.5}.bottom-sheet{position:fixed;inset:0;z-index:1000;display:flex;flex-direction:column;justify-content:flex-end;pointer-events:none;opacity:0;transition:opacity .3s ease}.bottom-sheet.open{pointer-events:auto;opacity:1}.sheet-overlay{position:absolute;inset:0;background:#0f172a66;backdrop-filter:blur(4px);opacity:0;transition:opacity .3s ease}.bottom-sheet.open .sheet-overlay{opacity:1}.sheet-content{position:relative;background:#fff;width:100%;max-width:600px;margin:0 auto;border-radius:28px 28px 0 0;display:flex;flex-direction:column;max-height:90vh;transform:translateY(100%);transition:transform .35s cubic-bezier(.2,.8,.2,1);box-shadow:0 -10px 40px #0000001a}.bottom-sheet.open .sheet-content{transform:translateY(0)}.sheet-handle{width:40px;height:5px;background:#cbd5e1;border-radius:3px;margin:12px auto}.sheet-header{display:flex;justify-content:space-between;align-items:center;padding:0 20px 16px;border-bottom:1px solid var(--border)}.sheet-header h3{margin:0;font-size:18px;font-weight:800;color:var(--text-primary)}.sheet-close{background:none;border:none;font-size:15px;font-weight:700;color:var(--text-secondary);padding:8px 0;cursor:pointer}.sheet-body{padding:20px;overflow-y:auto;flex:1}.sheet-body label{display:flex;flex-direction:column;gap:8px;font-size:14px;font-weight:700;color:var(--text-primary);margin-bottom:16px}.sheet-body input,.sheet-body select,.sheet-body textarea{border:1px solid var(--border);background:#f8fafc;border-radius:12px;padding:12px 14px;font-family:inherit;font-size:15px;color:var(--text-primary);outline:none;transition:border-color .2s ease}.sheet-body input:focus,.sheet-body textarea:focus{border-color:var(--accent);background:#fff}.sheet-body textarea{resize:none}.btn-primary-block{width:100%;background:var(--text-primary);color:#fff;border:none;padding:16px;border-radius:14px;font-size:16px;font-weight:700;cursor:pointer;margin-top:8px}.btn-primary-block:active{opacity:.9}.topic-detail-title{font-size:22px;font-weight:800;margin:16px 0 12px;color:var(--text-primary);line-height:1.3}.topic-detail-content{font-size:16px;line-height:1.6;color:#334155;margin:0 0 20px;white-space:pre-wrap}.topic-detail-stats{display:flex;gap:16px;color:var(--text-secondary);font-size:14px;font-weight:600}.topic-detail-stats span{display:flex;align-items:center;gap:4px}.topic-detail-divider{height:1px;background:var(--border);margin:20px 0}.topic-detail-replies-title{font-size:18px;font-weight:800;color:var(--text-primary);margin-bottom:16px}.reply-list{display:flex;flex-direction:column;gap:16px;padding-bottom:20px}.reply-item{display:flex;gap:12px}.reply-avatar{width:36px;height:36px;border-radius:50%;flex-shrink:0;background:#cbd5e1;display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;font-weight:700}.reply-content-box{background:#f8fafc;padding:12px 16px;border-radius:4px 16px 16px;flex:1}.reply-header{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:6px}.reply-author{font-size:14px;font-weight:700;color:var(--text-primary)}.reply-time{font-size:12px;color:var(--text-secondary)}.reply-text{font-size:14px;color:#334155;line-height:1.5;margin:0}.sheet-footer{padding:12px 20px calc(12px + env(safe-area-inset-bottom));border-top:1px solid var(--border);background:#fff}.reply-input-bar{display:flex;align-items:center;gap:10px;background:#f1f5f9;border-radius:999px;padding:4px 4px 4px 16px}.reply-input-bar input{flex:1;border:none;background:transparent;padding:10px 0;font-size:15px;outline:none;color:var(--text-primary)}.reply-send-btn{width:40px;height:40px;border-radius:50%;background:var(--text-primary);color:#fff;border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;flex-shrink:0}.reply-send-btn:active{transform:scale(.95)}.empty-state{text-align:center;padding:40px 20px;color:var(--text-secondary)}.empty-state svg{width:48px;height:48px;color:#cbd5e1;margin-bottom:12px}.empty-state p{font-size:16px;font-weight:500}