/* ---------- Thảo luận (js/social.js) ---------- */
.side-tabs { display: flex; border-bottom: 1px solid var(--border); flex: none; }
.side-tabs button { flex: 1; padding: 9px 6px; border: 0; border-bottom: 2px solid transparent; background: none; color: var(--muted); cursor: pointer; font-size: 13px; font-weight: 600; }
.side-tabs button:hover { color: var(--text); }
.side-tabs button.active { color: var(--text); border-bottom-color: var(--accent); }
.sidebar.talk > :not(.side-tabs):not(#talkPane) { display: none !important; }
.sidebar:not(.talk) > #talkPane { display: none; }
@media (min-width: 1100px) { .sidebar.talk { width: 360px; } }
.tk-pane { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.tk-top { display: flex; align-items: center; gap: 6px; padding: 8px 8px 8px 12px; border-bottom: 1px solid var(--border); }
.tk-ttl { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.tk-ttl b { font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tk-ttl .tk-link { align-self: flex-start; }
.tk-list { flex: 1; overflow-y: auto; padding: 0 12px 8px; min-height: 0; }
.tk-foot { padding: 6px 12px; border-top: 1px solid var(--border); font-size: 11px; }
.tk-foot a { color: var(--muted); }
.tk-thread { padding: 10px 0; border-bottom: 1px solid var(--border); }
.tk-thread:last-child { border-bottom: 0; }
.tk-item { display: flex; gap: 10px; align-items: flex-start; }
.tk-item.tk-reply { margin: 8px 0 0 28px; }
.tk-item.tk-del { font-size: 13px; padding: 2px 0; }
.tk-av { border-radius: 50%; flex: none; object-fit: cover; background: var(--hover); }
.tk-av-txt { display: inline-flex; align-items: center; justify-content: center; font-weight: 600; font-size: 13px; color: #fff; background: var(--accent); }
.tk-main { flex: 1; min-width: 0; }
.tk-head { display: flex; gap: 6px; align-items: baseline; flex-wrap: wrap; font-size: 13px; }
.tk-tag { font-size: 10px; padding: 1px 6px; border-radius: 8px; background: var(--accent); color: #fff; text-transform: uppercase; letter-spacing: .03em; }
.tk-body { margin-top: 3px; font-size: 14px; line-height: 1.5; white-space: pre-wrap; word-break: break-word; }
.tk-body a { color: var(--accent); }
.tk-acts { display: flex; gap: 12px; margin-top: 4px; align-items: center; }
.tk-acts .btn { padding: 3px 12px; font-size: 12px; }
.tk-link { border: 0; background: none; padding: 0; color: var(--muted); font-size: 12px; cursor: pointer; }
.tk-link:hover { color: var(--text); text-decoration: underline; }
.tk-link.on { color: var(--down); }
.tk-link.down { color: var(--down); }
.tk-compose { border-top: 1px solid var(--border); padding: 8px 12px; }
.tk-pane .hidden { display: none !important; }
.tk-row { display: flex; gap: 8px; align-items: flex-end; }
.tk-row .tk-av { display: none; }
.tk-row .btn { padding: 6px 12px; }
.tk-input { flex: 1; width: 100%; resize: vertical; min-height: 40px; max-height: 200px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; background: var(--bg); color: var(--text); font: inherit; font-size: 14px; outline: none; }
.tk-input:focus { border-color: var(--accent); }
.tk-edit { margin-top: 4px; }
.tk-me, .tk-replying { font-size: 12px; margin-top: 6px; }
.tk-replying { margin: 0 0 6px; }
.tk-login { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; font-size: 14px; }
.tk-signin { font-size: 13px; padding: 0 4px; }
#authBtn { min-width: 30px; }
#authBtn .tk-av { display: block; }
.sig-actions .tk-n { opacity: .8; }
@media (max-width: 1600px) { #talkBtn .hide-md { display: none; } }