:root{--red:#d71920;--red2:#a90e14;--bg:#f4f6f8;--card:#fff;--text:#15171a;--muted:#6d737b;--line:#e5e8ec;--mine:#d71920;--other:#eef1f4}*{box-sizing:border-box}body{margin:0;font-family:Inter,Arial,sans-serif;background:var(--bg);color:var(--text)}.topbar{height:72px;background:#111;color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 5%}.brand{font-size:23px;font-weight:900;color:#fff;text-decoration:none}.brand span{color:var(--red)}.topbar>a:last-child{color:#fff;text-decoration:none;font-weight:700;font-size:13px}.shell{width:min(1180px,calc(100% - 28px));height:calc(100vh - 104px);margin:16px auto;display:grid;grid-template-columns:350px 1fr;background:var(--card);border:1px solid var(--line);border-radius:22px;overflow:hidden;box-shadow:0 20px 55px rgba(20,25,30,.08)}.sidebar{border-right:1px solid var(--line);background:#fafbfc;overflow:auto}.side-head{padding:25px;border-bottom:1px solid var(--line)}.side-head>span{font-size:11px;color:var(--red);font-weight:900;text-transform:uppercase;letter-spacing:.1em}.side-head h1{font-size:24px;margin:8px 0}.side-head p{font-size:12px;color:var(--muted);line-height:1.6;margin:0}.conversation-list{padding:10px}.conversation{width:100%;border:0;background:transparent;text-align:left;padding:14px;border-radius:14px;cursor:pointer;margin-bottom:5px}.conversation:hover,.conversation.active{background:#fff;box-shadow:0 7px 22px rgba(15,20,25,.06)}.conversation strong,.conversation small,.conversation span{display:block}.conversation strong{font-size:14px}.conversation small{color:var(--muted);margin-top:4px}.conversation span{font-size:10px;color:var(--red);margin-top:6px;font-weight:800}.empty{padding:20px;color:var(--muted);font-size:13px}.chat{min-width:0}.chat-empty{height:100%;display:grid;place-content:center;text-align:center;padding:30px;color:var(--muted)}.chat-empty i{font-size:48px;color:#c9cdd2}.chat-empty h2{color:var(--text);margin-bottom:4px}.chat-area{height:100%;display:grid;grid-template-rows:auto 1fr auto auto}.hidden{display:none}.chat-head{padding:18px 22px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:15px}.chat-head small,.chat-head strong{display:block}.chat-head small{color:var(--muted);font-size:11px}.chat-head strong{font-size:17px;margin-top:2px}.secure{font-size:10px;color:#3d7f54;background:#eaf8ef;padding:8px 10px;border-radius:999px}.messages{overflow:auto;padding:22px;background:linear-gradient(180deg,#fbfcfd,#f5f7f9);display:flex;flex-direction:column;gap:10px}.msg{max-width:72%;padding:11px 13px;border-radius:15px;background:var(--other);align-self:flex-start;box-shadow:0 4px 10px rgba(20,25,30,.03)}.msg.mine{align-self:flex-end;background:var(--mine);color:#fff}.msg p{margin:0;white-space:pre-wrap;line-height:1.45;font-size:13px}.msg time{display:block;font-size:9px;opacity:.7;margin-top:5px;text-align:right}.composer{display:grid;grid-template-columns:1fr auto;gap:10px;padding:14px;border-top:1px solid var(--line);background:#fff}.composer textarea{resize:none;border:1px solid #dce0e4;border-radius:13px;padding:11px 12px;outline:none}.composer textarea:focus{border-color:var(--red);box-shadow:0 0 0 3px rgba(215,25,32,.08)}.composer button{border:0;border-radius:12px;background:var(--red);color:#fff;padding:0 18px;font-weight:800}.notice{padding:8px 15px 12px;color:#878d95;font-size:9px;background:#fff}.notice i{color:var(--red)}@media(max-width:760px){.shell{height:auto;min-height:calc(100vh - 90px);grid-template-columns:1fr}.sidebar{max-height:260px;border-right:0;border-bottom:1px solid var(--line)}.chat{min-height:550px}.secure{display:none}.msg{max-width:86%}.composer button span{display:none}}