:root{--bg: #f1f5f9;--card: #ffffff;--text: #0f172a;--muted: #64748b;--border: #e5e7eb;--primary: #2563eb;--max-w: 1440px}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;height:100%}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}.center-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.login-bg{background:linear-gradient(160deg,#1e293b,#2563eb)}.login-card{width:100%;max-width:380px;text-align:center;border-radius:18px;box-shadow:0 18px 50px #00000040}.login-logo{font-size:30px;font-weight:800;letter-spacing:-.5px;margin-bottom:12px}.app-shell{max-width:var(--max-w);margin:0 auto;min-height:100vh;background:var(--bg);padding-bottom:72px}.feed-header{position:sticky;top:0;z-index:10;background:var(--bg);padding:10px 12px 8px;border-bottom:1px solid var(--border)}.feed-topbar{display:flex;align-items:center;justify-content:space-between}.feed-title{font-size:22px;font-weight:800;margin:2px 0 8px}.feed-sort{margin-top:10px}.chip-row{display:flex;flex-wrap:wrap;gap:8px;padding:10px 0 2px}.chip{flex:0 0 auto;border:1px solid #cbd5e1;background:#fff;color:#334155;border-radius:999px;padding:6px 12px;font-size:13px;white-space:nowrap;cursor:pointer;transition:.15s}.chip--active{background:var(--primary);border-color:var(--primary);color:#fff}.chip-count{opacity:.6;font-size:11px;margin-left:2px}.chip--active .chip-count{opacity:.85}.feed-list{padding:12px;display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:12px;align-items:start}.feed-sentinel{grid-column:1 / -1;height:40px;display:flex;align-items:center;justify-content:center}.post-card{background:var(--card);border-radius:16px;padding:14px;box-shadow:0 1px 3px #0000000f;cursor:pointer;transition:transform .08s,box-shadow .15s}.post-card:active{transform:scale(.99)}.post-head{display:flex;align-items:center;gap:10px}.avatar-fallback{border-radius:50%;background:linear-gradient(135deg,#10b981,#2563eb);color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}.post-author-name{font-size:14px;font-weight:600;line-height:1.2}.post-author-meta{font-size:12px;color:var(--muted)}.rubric-badge{display:inline-block;margin-top:10px;font-size:12px;font-weight:700;background:#dbeafe;color:#1d4ed8;border-radius:7px;padding:2px 8px}.post-title{font-size:16px;font-weight:700;margin:8px 0 4px;line-height:1.3}.post-preview{font-size:14px;color:#334155;margin:4px 0;line-height:1.45}.post-cover{margin-top:10px;border-radius:12px;overflow:hidden;cursor:zoom-in}.post-cover .ant-image,.post-cover-img{width:100%;display:block}.post-cover img{width:100%;height:auto;display:block;object-fit:contain}.post-foot{display:flex;align-items:center;justify-content:space-between;margin-top:12px;font-size:13px;color:var(--muted)}.reactions{display:inline-flex;gap:6px;flex-wrap:wrap}.reaction-pill{background:#f1f5f9;border-radius:999px;padding:2px 8px;font-size:13px}.post-comments{display:inline-flex;align-items:center;gap:5px}.bottom-nav{position:fixed;left:50%;transform:translate(-50%);bottom:0;width:100%;max-width:var(--max-w);background:#fff;border-top:1px solid var(--border);display:flex;justify-content:space-around;padding:8px 0 calc(8px + env(safe-area-inset-bottom));z-index:20}.bottom-nav__item{background:none;border:none;cursor:pointer;color:var(--muted);font-size:11px;display:flex;flex-direction:column;align-items:center;gap:3px;text-decoration:none}.bottom-nav__item svg{font-size:19px}.bottom-nav__item--active{color:var(--primary);font-weight:700}.bottom-nav__item--disabled{opacity:.4;pointer-events:none}.post-page{max-width:820px;margin:0 auto;min-height:100vh;background:var(--card)}.post-page__bar{position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:6px;padding:8px 10px;background:#fff;border-bottom:1px solid var(--border);font-weight:600}.post-page__body{padding:16px}.post-page__title{font-size:22px;line-height:1.25;margin:12px 0}.post-page__content{font-size:16px;line-height:1.6;color:#1e293b;word-break:break-word}.post-page__content img{max-width:100%;border-radius:10px;height:auto}.post-page__images{display:grid;gap:10px;margin-top:14px}.post-page__images .ant-image{width:100%;cursor:zoom-in}.post-page__images img{width:100%;height:auto;border-radius:12px;display:block}.comment{display:flex;gap:10px;padding:10px 0;border-bottom:1px solid #f1f5f9}.comment__head{display:flex;gap:8px;align-items:baseline}.comment__name{font-size:13px;font-weight:600}.comment__time{font-size:11px;color:var(--muted)}.comment__text{font-size:14px;line-height:1.45;margin-top:2px}.muted{color:var(--muted)}