.chat-app{display:flex;height:100vh;overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.chat-app.mobile{flex-direction:column}.sidebar{width:300px;height:100vh;display:flex;flex-direction:column;background:var(--sidebar-bg);border-right:1px solid var(--border-color);box-sizing:border-box}.chat-app.mobile .sidebar{width:100%;position:absolute;inset:0;z-index:1000;transform:translate(-100%)}.chat-app.mobile .sidebar.show{transform:translate(0)}.sidebar-header{padding:16px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between}.header-left{display:flex;align-items:center;gap:12px}.app-title{font-size:1.5rem;font-weight:700;margin:0;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.header-actions{display:flex;gap:8px;align-items:center;flex-shrink:0}.chat-list{flex:1;overflow-y:auto;padding:8px}.chat-item{display:flex;align-items:center;padding:12px;border-radius:12px;margin-bottom:8px;cursor:pointer;transition:background .2s;gap:12px}.chat-item:hover{background:var(--hover-bg)}.chat-item.active{background:var(--active-bg)}.chat-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.2rem}.chat-info{flex:1;min-width:0}.chat-name{font-weight:600;margin-bottom:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-preview{font-size:.85rem;color:var(--text-secondary)}.chat-header-actions{display:flex;gap:8px;align-items:center}.call-btn{background:var(--button-bg);border-radius:50%;width:40px;height:40px}.call-btn:hover{background:var(--button-hover-bg)}.messages-container{flex:1;overflow-y:auto;position:relative;padding:0}.messages-wrapper{min-height:100%;display:flex;flex-direction:column;padding:20px 20px 80px}.messages-end{height:1px;margin-top:auto}.message-bubble:last-child{animation:slideIn .3s ease-out}.main-area{flex:1;display:flex;flex-direction:column;background:var(--main-bg)}.chat-app.mobile .main-area{width:100%}.chat-header{padding:16px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;min-height:72px}.chat-header-left{display:flex;align-items:center;gap:12px}.chat-title{font-size:1.25rem;font-weight:600}.chat-header-info{font-size:.875rem;color:var(--text-secondary)}.messages-container{flex:1;overflow-y:auto;padding:20px 20px 80px}.message-bubble{max-width:70%;margin-bottom:16px;padding:12px 16px;border-radius:18px;position:relative}.message-bubble.own{background:var(--own-message-bg);margin-left:auto;border-bottom-right-radius:4px}.message-bubble.other{background:var(--other-message-bg);margin-right:auto;border-bottom-left-radius:4px}.message-content{word-break:break-word;line-height:1.4;margin-bottom:4px}.message-meta{display:flex;justify-content:space-between;align-items:center;font-size:.75rem;color:var(--text-secondary)}.input-container{padding:16px;border-top:1px solid var(--border-color);background:var(--main-bg);position:sticky;bottom:0}.input-container.keyboard-open{padding-bottom:calc(16px + env(safe-area-inset-bottom))}.input-wrapper{display:flex;align-items:center;gap:12px;position:relative}.message-input{flex:1;padding:12px 16px;border-radius:24px;border:2px solid var(--border-color);background:var(--input-bg);color:var(--text-primary);font-size:1rem;outline:none;transition:border-color .2s}.message-input:focus{border-color:var(--primary-color)}.emoji-btn,.send-btn{width:44px;height:44px;border-radius:50%;border:none;background:var(--button-bg);color:var(--text-primary);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background .2s}.send-btn:disabled{opacity:.5;cursor:not-allowed}.emoji-btn:hover,.send-btn:hover:not(:disabled){background:var(--button-hover-bg)}.emoji-picker-positioner{position:absolute;bottom:60px;left:0;z-index:1000}.welcome-screen{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;text-align:center;color:var(--text-secondary)}.welcome-screen h2{margin:20px 0 10px;color:var(--text-primary)}.btn-icon{background:var(--button-bg);border:1px solid var(--border-color);color:var(--text-primary);cursor:pointer;padding:8px;border-radius:10px;display:flex;align-items:center;justify-content:center;transition:background .2s,border-color .2s}.btn-icon:hover{background:var(--button-hover-bg)}.btn-logout{width:100%;margin-top:12px;background:#ef44441a;border:1px solid rgba(239,68,68,.3);color:#ef4444;cursor:pointer;padding:10px 14px;border-radius:12px;font-weight:600;display:flex;align-items:center;justify-content:center;gap:8px;transition:background .2s,transform .1s}.btn-logout:hover{background:#ef444433;transform:translateY(-1px)}.browse-chats-btn,.create-chat-btn{margin-top:16px;padding:12px 24px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:24px;font-weight:600;cursor:pointer;transition:transform .2s}.browse-chats-btn:hover,.create-chat-btn:hover{transform:translateY(-2px)}.empty-list{text-align:center;padding:48px 20px;color:var(--text-secondary)}.empty-list p{margin:16px 0}.chat-app.dark{--sidebar-bg: #1a1a1a;--main-bg: #0a0a0a;--input-bg: #262626;--border-color: #333;--hover-bg: rgba(255, 255, 255, .05);--active-bg: rgba(255, 255, 255, .1);--text-primary: #ffffff;--text-secondary: #a0a0a0;--own-message-bg: #2563eb;--other-message-bg: #262626;--button-bg: #262626;--button-hover-bg: #333;--primary-color: #3b82f6}.chat-app.light{--sidebar-bg: #f8fafc;--main-bg: #ffffff;--input-bg: #f1f5f9;--border-color: #e2e8f0;--hover-bg: rgba(0, 0, 0, .05);--active-bg: rgba(0, 0, 0, .1);--text-primary: #1a1a1a;--text-secondary: #64748b;--own-message-bg: #3b82f6;--other-message-bg: #f1f5f9;--button-bg: #f1f5f9;--button-hover-bg: #e2e8f0;--primary-color: #2563eb}@media(max-width:768px){.chat-app{position:fixed;inset:0}.messages-container{padding:12px 12px 100px}.message-bubble{max-width:85%}.chat-header,.input-container{padding:12px 16px}.emoji-picker-positioner{width:100%}.sidebar,.main-area{padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom)}}@keyframes slideIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message-bubble{animation:slideIn .2s ease-out}.chat-list::-webkit-scrollbar,.messages-container::-webkit-scrollbar{width:6px}.chat-list::-webkit-scrollbar-track,.messages-container::-webkit-scrollbar-track{background:transparent}.chat-list::-webkit-scrollbar-thumb,.messages-container::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:3px}@media(hover:none)and (pointer:coarse){.btn-icon,.chat-item,.emoji-btn,.send-btn{min-height:44px;min-width:44px}.message-input{font-size:16px}}.sidebar-search{padding:12px 16px;border-bottom:1px solid var(--border-color);position:relative}.search-icon{position:absolute;left:28px;top:50%;transform:translateY(-50%);color:var(--text-secondary)}.search-input{width:100%;box-sizing:border-box;padding:10px 12px 10px 40px;border-radius:12px;border:1px solid var(--border-color);background:var(--input-bg);color:var(--text-primary);font-size:.95rem;outline:none;transition:border-color .2s,background .2s}.search-input::placeholder{color:var(--text-secondary)}.search-input:focus{border-color:var(--primary-color);background:var(--main-bg)}.sidebar-footer{margin-top:auto;padding:16px;border-top:1px solid var(--border-color);background:var(--sidebar-bg);box-sizing:border-box;padding-bottom:calc(16px + env(safe-area-inset-bottom))}.btn-logout{width:100%;box-sizing:border-box}.input-actions{display:flex;align-items:center;gap:8px}.attach-btn{width:44px;height:44px;border-radius:50%;border:none;background:var(--button-bg);color:var(--text-primary);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background .2s,transform .1s}.attach-btn:hover:not(:disabled){background:var(--button-hover-bg)}.attach-btn:active:not(:disabled){transform:scale(.95)}.attach-btn:disabled{opacity:.5;cursor:not-allowed}.voice-btn{width:44px;height:44px;border-radius:50%;border:none;background:var(--button-bg);color:var(--text-primary);display:flex;align-items:center;justify-content:center;position:relative;cursor:pointer;transition:background .2s,transform .1s}.voice-btn:hover:not(:disabled){background:var(--button-hover-bg)}.voice-btn:active:not(:disabled){transform:scale(.95)}.voice-btn.recording{background:#ef4444;color:#fff;animation:pulse-record 1.2s infinite}.recording-indicator{position:absolute;top:6px;right:6px;width:8px;height:8px;background:#fff;border-radius:50%}@keyframes pulse-record{0%{box-shadow:0 0 #ef444499}70%{box-shadow:0 0 0 10px #ef444400}to{box-shadow:0 0 #ef444400}}body{margin:0;font-family:system-ui,sans-serif;background:#f3f4f6}.auth-card{background:#fff;padding:30px;width:320px;border-radius:12px;box-shadow:0 10px 30px #0003;display:flex;flex-direction:column;gap:12px;margin:50px auto}.auth-card h2{text-align:center;margin-bottom:10px}.auth-card input{padding:10px;border-radius:8px;border:1px solid #ddd;font-size:14px}.auth-card button{padding:10px;border-radius:8px;border:none;background:#4f46e5;color:#fff;font-size:15px;cursor:pointer}.auth-card button:hover{background:#4338ca}.auth-card p{text-align:center;font-size:14px}.link{color:#4f46e5;cursor:pointer;font-weight:500}.chat-layout{display:flex;height:100vh}.sidebar{width:260px;background:#111827;color:#fff;display:flex;flex-direction:column}.sidebar-header{padding:16px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #1f2937}.logout{background:none;border:none;color:#9ca3af;cursor:pointer}.chat-item{padding:14px 16px;cursor:pointer;border-bottom:1px solid #1f2937}.chat-item:hover,.chat-item.active{background:#1f2937}.chat-area{flex:1;display:flex;flex-direction:column}.messages{flex:1;padding:20px;overflow-y:auto}.message{max-width:60%;padding:10px 14px;border-radius:16px;margin-bottom:10px;background:#e5e7eb}.message.me{background:#4f46e5;color:#fff;margin-left:auto}.input-area{display:flex;padding:12px;background:#fff;border-top:1px solid #ddd}.input-area input{flex:1;padding:10px;border-radius:20px;border:1px solid #ddd}.input-area button{margin-left:10px;border:none;border-radius:50%;width:40px;background:#4f46e5;color:#fff;cursor:pointer}.empty{margin:auto;color:#6b7280}.new-chat{margin:10px;padding:10px;border:none;border-radius:8px;background:#4f46e5;color:#fff;cursor:pointer}.new-chat:hover{background:#4338ca}.modal-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:999}.modal{background:#141414;padding:24px;border-radius:8px;width:300px;box-shadow:0 4px 12px #0003}.modal h2{margin-bottom:16px}.modal input{width:100%;padding:8px;margin-bottom:16px;border-radius:4px;border:1px solid #ccc}.modal-actions{display:flex;justify-content:flex-end;gap:8px}.btn{padding:8px 12px;border:none;border-radius:4px;background-color:#3b82f6;color:#fff;cursor:pointer}.btn:hover{background-color:#2563eb}.btn-cancel{background-color:#e5e7eb;color:#111}.btn-cancel:hover{background-color:#d1d5db}