:root{--bg-main:#0e1621;--bg-sidebar:#17212b;--bg-chat:#0e1621;--bg-input:#17212b;--accent:#5288c1;--accent-hover:#4a7bb3;--text-primary:#fff;--text-secondary:#6d7883;--border:#101921;--bubble-out:#2b5278;--bubble-in:#182533;--online:#4dcd5e;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-main);color:var(--text-primary);overflow:hidden}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-thumb{background:#2b3a4a;border-radius:3px}.app{width:100vw;height:100vh;display:flex}.auth-screen{background:var(--bg-main);justify-content:center;align-items:center;width:100%;height:100%;display:flex}.auth-card{background:var(--bg-sidebar);text-align:center;border-radius:12px;width:340px;padding:40px}.auth-logo{background:linear-gradient(135deg,#2aabee,#229ed9);border-radius:50%;justify-content:center;align-items:center;width:64px;height:64px;margin:0 auto 20px;font-size:32px;display:flex}.auth-card h2{margin-bottom:20px;font-weight:500}.auth-card input{background:var(--bg-input);border:1px solid var(--border);width:100%;color:var(--text-primary);border-radius:8px;outline:none;margin-bottom:12px;padding:12px 14px;font-size:14px}.auth-card input:focus{border-color:var(--accent)}.auth-card button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;width:100%;margin-top:8px;padding:12px;font-size:14px;font-weight:500}.auth-card button:hover{background:var(--accent-hover)}.auth-switch{color:var(--text-secondary);cursor:pointer;margin-top:16px;font-size:13px}.auth-switch:hover{color:var(--accent)}.auth-error{color:#e17076;margin-bottom:10px;font-size:13px}.sidebar{background:var(--bg-sidebar);border-right:1px solid var(--border);flex-direction:column;width:380px;min-width:320px;display:flex}.sidebar-header{border-bottom:1px solid var(--border);align-items:center;gap:12px;padding:14px 16px;display:flex}.search-box{background:var(--bg-input);border-radius:20px;flex:1;align-items:center;gap:8px;padding:8px 16px;display:flex}.search-box input{color:var(--text-primary);background:0 0;border:none;outline:none;width:100%;font-size:14px}.search-box input::placeholder{color:var(--text-secondary)}.icon-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:50%;padding:6px;font-size:18px}.icon-btn:hover{color:var(--text-primary);background:#ffffff0d}.chat-list{flex:1;overflow-y:auto}.chat-item{cursor:pointer;border-bottom:1px solid #ffffff05;align-items:center;gap:12px;padding:10px 16px;display:flex}.chat-item:hover{background:#ffffff08}.chat-item.active{background:var(--accent)}.chat-item.active .chat-preview,.chat-item.active .chat-time{color:#ffffffbf}.avatar{color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:48px;height:48px;font-size:18px;font-weight:600;display:flex;position:relative}.avatar.small{width:36px;height:36px;font-size:14px}.online-dot{background:var(--online);border:2px solid var(--bg-sidebar);border-radius:50%;width:12px;height:12px;position:absolute;bottom:0;right:0}.chat-info{flex:1;min-width:0}.chat-name-row{justify-content:space-between;align-items:center;display:flex}.chat-name{font-size:15px;font-weight:500}.chat-time{color:var(--text-secondary);font-size:12px}.chat-preview{color:var(--text-secondary);white-space:nowrap;text-overflow:ellipsis;font-size:13px;overflow:hidden}.empty-list{text-align:center;color:var(--text-secondary);padding:40px 20px;font-size:14px}.chat-window{background:var(--bg-chat);background-image:radial-gradient(circle at 20% 30%,#5288c108 0%,#0000 50%);flex-direction:column;flex:1;display:flex}.chat-header{border-bottom:1px solid var(--border);background:var(--bg-sidebar);align-items:center;gap:12px;padding:10px 20px;display:flex}.chat-header-info{flex:1}.chat-header-name{font-size:15px;font-weight:500}.chat-header-status{color:var(--text-secondary);font-size:13px}.chat-header-actions{gap:4px;display:flex}.messages-area{flex-direction:column;flex:1;gap:4px;padding:20px;display:flex;overflow-y:auto}.no-chat-selected{color:var(--text-secondary);flex:1;justify-content:center;align-items:center;font-size:15px;display:flex}.message-row{margin-bottom:4px;display:flex}.message-row.out{justify-content:flex-end}.bubble{word-wrap:break-word;border-radius:12px;max-width:60%;padding:8px 12px;font-size:14px;line-height:1.4;position:relative}.bubble.in{background:var(--bubble-in);border-bottom-left-radius:4px}.bubble.out{background:var(--bubble-out);border-bottom-right-radius:4px}.bubble-time{color:#ffffff80;float:right;margin-top:2px;margin-left:8px;font-size:11px}.message-input-bar{background:var(--bg-sidebar);border-top:1px solid var(--border);align-items:center;gap:8px;padding:12px 16px;display:flex}.message-input-bar input{background:var(--bg-input);color:var(--text-primary);border:none;border-radius:20px;outline:none;flex:1;padding:12px 18px;font-size:14px}.send-btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;font-size:16px;display:flex}.send-btn:hover{background:var(--accent-hover)}.typing-indicator{color:var(--accent);padding:0 20px 4px;font-size:12px}.modal-overlay{z-index:100;background:#00000080;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal{background:var(--bg-sidebar);border-radius:12px;width:320px;padding:24px}.modal h3{margin-bottom:16px;font-weight:500}.modal input{background:var(--bg-input);border:1px solid var(--border);width:100%;color:var(--text-primary);border-radius:8px;outline:none;margin-bottom:12px;padding:10px 14px}.modal-actions{justify-content:flex-end;gap:8px;display:flex}.modal-actions button{cursor:pointer;border:none;border-radius:8px;padding:8px 16px;font-size:14px}.modal-actions .cancel{color:var(--text-secondary);background:0 0}.modal-actions .confirm{background:var(--accent);color:#fff}.call-overlay{z-index:200;background:#0a0f14f7;flex-direction:column;justify-content:center;align-items:center;gap:20px;display:flex;position:fixed;inset:0}.call-avatar{width:120px;height:120px;font-size:48px}.call-name{font-size:22px;font-weight:500}.call-status{color:var(--text-secondary);font-size:14px}.call-videos{width:100%;height:100%;position:relative}.call-video-remote{object-fit:cover;width:100%;height:100%}.call-video-local{object-fit:cover;border:2px solid var(--border);border-radius:12px;width:200px;height:150px;position:absolute;bottom:100px;right:30px}.call-actions{gap:20px;margin-top:20px;display:flex}.call-btn{cursor:pointer;border:none;border-radius:50%;justify-content:center;align-items:center;width:60px;height:60px;font-size:22px;display:flex}.call-btn.accept{background:var(--online);color:#fff}.call-btn.reject{color:#fff;background:#e17076}.call-btn.mute{color:#fff;background:#ffffff1a}.call-btn.mute.active{background:var(--accent)}