@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap");:root{--bg-primary:#0a0f1c;--bg-secondary:#111827;--bg-tertiary:#1a2236;--bg-glass:rgba(17,24,39,.7);--bg-hover:rgba(59,130,246,.08);--accent:#3b82f6;--accent-hover:#2563eb;--accent-glow:rgba(59,130,246,.3);--accent-subtle:rgba(59,130,246,.15);--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-muted:#64748b;--border:rgba(148,163,184,.1);--border-active:rgba(59,130,246,.4);--success:#22c55e;--error:#ef4444;--warning:#f59e0b;--sent-bubble:#1e3a5f;--received-bubble:#1e293b;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-full:9999px;--shadow-sm:0 1px 3px rgba(0,0,0,.3);--shadow-md:0 4px 12px rgba(0,0,0,.4);--shadow-lg:0 8px 32px rgba(0,0,0,.5);--transition:200ms cubic-bezier(0.4,0,0.2,1)}*{margin:0;padding:0;box-sizing:border-box}body,html{height:100%;overflow:hidden}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}button,input,textarea{font-family:inherit;font-size:inherit;outline:none;border:none}.auth-container{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--bg-primary) 0,#0f172a 50%,#1a1040 100%);position:relative;overflow:hidden}.auth-container:before{content:"";position:absolute;width:500px;height:500px;background:radial-gradient(circle,var(--accent-glow) 0,transparent 70%);top:-100px;right:-100px;animation:float 8s ease-in-out infinite}.auth-container:after{content:"";position:absolute;width:400px;height:400px;background:radial-gradient(circle,rgba(139,92,246,.15) 0,transparent 70%);bottom:-100px;left:-100px;animation:float 10s ease-in-out infinite reverse}@keyframes float{0%,to{transform:translate(0) scale(1)}50%{transform:translate(30px,-30px) scale(1.1)}}.auth-card{width:100%;max-width:420px;padding:40px;background:var(--bg-glass);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);position:relative;z-index:1;animation:slideUp .5s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.auth-logo{text-align:center;margin-bottom:32px}.auth-logo h1{font-size:28px;font-weight:700;background:linear-gradient(135deg,var(--accent) 0,#8b5cf6 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:8px}.auth-logo p{color:var(--text-secondary);font-size:14px}.auth-tabs{display:flex;gap:4px;padding:4px;background:var(--bg-primary);border-radius:var(--radius-md);margin-bottom:28px}.auth-tab{flex:1 1;padding:10px;text-align:center;font-size:14px;font-weight:500;color:var(--text-secondary);background:transparent;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition)}.auth-tab.active{background:var(--accent);color:#fff;box-shadow:0 2px 8px var(--accent-glow)}.form-group{margin-bottom:18px}.form-group label{display:block;font-size:13px;font-weight:500;color:var(--text-secondary);margin-bottom:6px}.form-input{width:100%;padding:12px 16px;background:var(--bg-primary);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:14px;transition:all var(--transition)}.form-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-subtle)}.form-input::placeholder{color:var(--text-muted)}.auth-submit{width:100%;padding:12px;background:linear-gradient(135deg,var(--accent) 0,#6366f1 100%);color:#fff;font-size:15px;font-weight:600;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition);margin-top:8px}.auth-submit:hover{transform:translateY(-1px);box-shadow:0 4px 16px var(--accent-glow)}.auth-submit:disabled{opacity:.6;cursor:not-allowed;transform:none}.auth-error{padding:10px 14px;background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.2);border-radius:var(--radius-sm);color:var(--error);font-size:13px;margin-bottom:16px;animation:shake .3s ease}@keyframes shake{0%,to{transform:translateX(0)}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}.chat-layout{background:var(--bg-primary)}.chat-layout,.sidebar{display:flex;height:100vh}.sidebar{width:340px;min-width:340px;background:var(--bg-secondary);border-right:1px solid var(--border);flex-direction:column}.sidebar-header{padding:20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.sidebar-header h2{font-size:20px;font-weight:700;background:linear-gradient(135deg,var(--accent) 0,#8b5cf6 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.sidebar-actions{display:flex;gap:8px}.icon-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--bg-tertiary);border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;transition:all var(--transition);font-size:18px}.icon-btn:hover{background:var(--accent-subtle);color:var(--accent)}.search-box{padding:12px 20px;border-bottom:1px solid var(--border)}.search-input{width:100%;padding:10px 14px 10px 38px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:13px;transition:all var(--transition)}.search-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-subtle)}.search-wrapper{position:relative}.search-icon{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--text-muted);font-size:14px}.room-list{flex:1 1;overflow-y:auto;padding:8px}.room-item{display:flex;align-items:center;gap:12px;padding:12px;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition);position:relative}.room-item:hover{background:var(--bg-hover)}.room-item.active{background:var(--accent-subtle)}.room-avatar{width:48px;height:48px;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--accent) 0,#8b5cf6 100%);display:flex;align-items:center;justify-content:center;font-weight:600;font-size:18px;color:#fff;flex-shrink:0;position:relative}.online-dot{width:12px;height:12px;background:var(--success);border:2px solid var(--bg-secondary);border-radius:var(--radius-full);position:absolute;bottom:0;right:0;animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{box-shadow:0 0 0 0 rgba(34,197,94,.4)}50%{box-shadow:0 0 0 4px rgba(34,197,94,0)}}.room-info{flex:1 1;min-width:0}.room-name{font-size:14px;font-weight:600;margin-bottom:2px}.room-last-msg,.room-name{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.room-last-msg{font-size:12px;color:var(--text-muted)}.room-meta{display:flex;flex-direction:column;align-items:flex-end;gap:4px}.room-time{font-size:11px;color:var(--text-muted)}.unread-badge{min-width:20px;height:20px;padding:0 6px;background:var(--accent);border-radius:var(--radius-full);font-size:11px;font-weight:600;display:flex;align-items:center;justify-content:center;color:#fff}.chat-main{min-width:0}.chat-empty,.chat-main{flex:1 1;display:flex;flex-direction:column}.chat-empty{align-items:center;justify-content:center;color:var(--text-muted);gap:12px}.chat-empty-icon{font-size:64px;opacity:.3}.chat-empty h3{font-size:18px;font-weight:600;color:var(--text-secondary)}.chat-header{padding:16px 24px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:12px;background:var(--bg-glass);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.chat-header-info h3{font-size:15px;font-weight:600}.chat-header-info p{font-size:12px;color:var(--text-muted)}.chat-header-info .online-text{color:var(--success)}.messages-container{flex:1 1;overflow-y:auto;padding:20px 24px;display:flex;flex-direction:column;gap:4px}.message-group{margin-bottom:16px}.date-separator{text-align:center;margin:16px 0}.date-separator span{font-size:11px;color:var(--text-muted);background:var(--bg-tertiary);padding:4px 12px;border-radius:var(--radius-full)}.message-row{display:flex;gap:8px;margin-bottom:2px;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.message-row.sent{justify-content:flex-end}.message-bubble{max-width:65%;padding:10px 14px;border-radius:var(--radius-md);font-size:14px;line-height:1.5;word-wrap:break-word;position:relative}.message-row.sent .message-bubble{background:linear-gradient(135deg,var(--accent) 0,#6366f1 100%);color:#fff;border-bottom-right-radius:4px}.message-row.received .message-bubble{background:var(--received-bubble);color:var(--text-primary);border-bottom-left-radius:4px}.message-sender{font-size:12px;font-weight:600;color:var(--accent);margin-bottom:2px}.message-time{font-size:10px;opacity:.7;margin-top:4px;text-align:right}.message-read{opacity:.5}.message-input-container{padding:16px 24px;border-top:1px solid var(--border);background:var(--bg-secondary)}.message-input-wrapper{display:flex;align-items:flex-end;gap:12px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-md);padding:8px 12px;transition:all var(--transition)}.message-input-wrapper:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-subtle)}.message-textarea{flex:1 1;background:transparent;color:var(--text-primary);font-size:14px;resize:none;max-height:120px;line-height:1.5;padding:4px 0}.message-textarea::placeholder{color:var(--text-muted)}.send-btn{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--accent) 0,#6366f1 100%);border-radius:var(--radius-sm);color:#fff;cursor:pointer;transition:all var(--transition);font-size:18px;flex-shrink:0}.send-btn:hover{transform:scale(1.05);box-shadow:0 2px 12px var(--accent-glow)}.send-btn:disabled{opacity:.4;cursor:not-allowed;transform:none}.typing-indicator{display:flex;align-items:center;gap:6px;padding:4px 0 8px;font-size:12px;color:var(--text-muted)}.typing-dots{display:flex;gap:3px}.typing-dots span{width:6px;height:6px;background:var(--text-muted);border-radius:var(--radius-full);animation:bounce 1.4s ease-in-out infinite}.typing-dots span:nth-child(2){animation-delay:.16s}.typing-dots span:nth-child(3){animation-delay:.32s}@keyframes bounce{0%,60%,to{transform:translateY(0)}30%{transform:translateY(-6px)}}.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:100;animation:fadeIn .2s ease}.modal{width:100%;max-width:440px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:28px;animation:slideUp .3s ease}.modal h2{font-size:18px;font-weight:700;margin-bottom:20px}.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:20px}.btn-secondary{padding:10px 20px;background:var(--bg-tertiary);color:var(--text-secondary);border-radius:var(--radius-sm);font-size:14px;font-weight:500;cursor:pointer;transition:all var(--transition)}.btn-secondary:hover{background:var(--bg-hover)}.btn-primary{padding:10px 20px;background:var(--accent);color:#fff;border-radius:var(--radius-sm);font-size:14px;font-weight:500;cursor:pointer;transition:all var(--transition)}.btn-primary:hover{background:var(--accent-hover);box-shadow:0 2px 8px var(--accent-glow)}.user-search-results{max-height:200px;overflow-y:auto;margin-top:12px}.user-search-item{display:flex;align-items:center;gap:10px;padding:10px;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition)}.user-search-item:hover{background:var(--bg-hover)}.user-search-item.selected{background:var(--accent-subtle);border:1px solid var(--border-active)}.user-search-avatar{width:36px;height:36px;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--accent) 0,#8b5cf6 100%);display:flex;align-items:center;justify-content:center;font-weight:600;font-size:14px;color:#fff}.sidebar-profile{padding:16px 20px;border-top:1px solid var(--border);display:flex;align-items:center;gap:12px}.sidebar-profile-info{flex:1 1;min-width:0}.sidebar-profile-name{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-profile-email{font-size:11px;color:var(--text-muted)}.logout-btn{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:transparent;color:var(--text-muted);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition);font-size:16px}.logout-btn:hover{background:rgba(239,68,68,.1);color:var(--error)}