:root{--bg:#f0f2f5;--panel:#fff;--border:#e2e5e9;--text:#1a1a1a;--text-muted:#667085;--accent:#25d366;--accent-dark:#1da851;--bubble-in:#fff;--bubble-out:#d9fdd3}@media (prefers-color-scheme:dark){:root{--bg:#0b141a;--panel:#111b21;--border:#26343b;--text:#e9edef;--text-muted:#8696a0;--bubble-in:#202c33;--bubble-out:#005c4b}}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:system-ui,Segoe UI,Roboto,sans-serif}.login-screen{justify-content:center;align-items:center;height:100%;display:flex}.login-form{background:var(--panel);border:1px solid var(--border);border-radius:12px;flex-direction:column;gap:12px;width:320px;padding:32px;display:flex}.login-form h1{text-align:center;margin:0 0 8px;font-size:20px}.login-form input{border:1px solid var(--border);color:var(--text);background:0 0;border-radius:8px;padding:10px 12px;font-size:14px}.login-form button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:10px 12px;font-weight:600}.login-form button:hover{background:var(--accent-dark)}.login-error{color:#d33;font-size:13px}.dashboard{height:100%;display:flex}.dashboard-sidebar{border-right:1px solid var(--border);background:var(--panel);flex-direction:column;flex-shrink:0;width:320px;display:flex}.dashboard-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:14px 16px;font-weight:600;display:flex}.dashboard-header button{color:var(--text-muted);cursor:pointer;background:0 0;border:none;font-size:13px}.chat-list{flex:1;overflow-y:auto}.chat-list-empty{color:var(--text-muted);padding:24px 16px;font-size:14px}.chat-list-item{border-bottom:1px solid var(--border);cursor:pointer;padding:12px 16px}.chat-list-item:hover,.chat-list-item.selected{background:#25d36614}.chat-list-name{margin-bottom:2px;font-weight:600}.chat-list-preview{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;font-size:13px;overflow:hidden}.chat-window{flex-direction:column;flex:1;min-width:0;display:flex}.chat-window-empty{color:var(--text-muted);justify-content:center;align-items:center}.chat-window-header{border-bottom:1px solid var(--border);background:var(--panel);padding:14px 20px}.chat-window-name{font-weight:600}.chat-window-number{color:var(--text-muted);font-size:12px}.chat-window-messages{flex-direction:column;flex:1;gap:8px;padding:20px;display:flex;overflow-y:auto}.message-row{display:flex}.message-row.out{justify-content:flex-end}.message-bubble{background:var(--bubble-in);border-radius:8px;max-width:60%;padding:8px 12px;box-shadow:0 1px 1px #00000014}.message-row.out .message-bubble{background:var(--bubble-out)}.message-content{white-space:pre-wrap;word-break:break-word;font-size:14px}.message-image{border-radius:6px;max-width:280px;max-height:320px;display:block}.message-audio{max-width:260px}.message-video{border-radius:6px;max-width:280px;max-height:320px;display:block}.message-document{color:var(--text);font-size:14px;font-weight:600;text-decoration:none}.message-document:hover{text-decoration:underline}.message-time{color:var(--text-muted);text-align:right;margin-top:4px;font-size:11px}.chat-window-input{border-top:1px solid var(--border);background:var(--panel);gap:8px;padding:14px 20px;display:flex}.chat-window-input input{border:1px solid var(--border);color:var(--text);background:0 0;border-radius:20px;flex:1;padding:10px 14px;font-size:14px}.chat-window-input button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:20px;padding:10px 20px;font-weight:600}.chat-window-input button:disabled{opacity:.6;cursor:default}