:root{--bg-primary: #121212;--bg-secondary: #1e1e1e;--bg-input: #2c2c2c;--text-primary: #ffffff;--text-secondary: #aaaaaa;--accent: #2b5278;--accent-light: #3a6b99;--danger: #ff4444;--border: #333333;--safe-bottom: env(safe-area-inset-bottom, 0px);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:16px;color:var(--text-primary);background-color:var(--bg-primary);-webkit-tap-highlight-color:transparent}*{box-sizing:border-box;margin:0;padding:0}body{height:100%;overscroll-behavior:none}button{font:inherit;border:none;cursor:pointer;padding:10px 16px;border-radius:10px;font-weight:500;min-height:22px;min-width:22px;display:inline-flex;align-items:center;justify-content:center;background-color:var(--accent);color:#fff;transition:opacity .2s}button:active{opacity:.7}input[type=text],input[type=email],input[type=password]{width:100%;padding:12px 16px;border-radius:10px;border:1px solid var(--border);background:var(--bg-input);color:var(--text-primary);font:inherit;outline:none}input[type=file]{display:none}a{color:var(--accent);text-decoration:none}.chat-layout{display:flex;height:100vh;height:100dvh;flex-direction:column;padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom);padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}.chat-main{flex:1;display:flex;overflow:hidden}.sidebar{width:100%;max-width:360px;background:var(--bg-secondary);border-right:1px solid var(--border);display:flex;flex-direction:column}.chat-area{flex:1;display:flex;flex-direction:column;background:var(--bg-primary);overflow:hidden;padding-bottom:env(safe-area-inset-bottom)}.chat-placeholder{flex:1;display:flex;align-items:center;justify-content:center;color:var(--text-secondary)}.chat-item{display:flex;flex-direction:column;padding:14px 16px;gap:8px;border-bottom:1px solid var(--border);cursor:pointer;transition:background .2s}.chat-item:active{background:#ffffff0d}.chat-item.active{background:#4a9eff1a}.chat-item-title{font-weight:600;margin-bottom:4px}.chat-item-preview{color:var(--text-secondary);font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.unread-badge{align-self:flex-start;background:var(--accent);color:#fff;border-radius:10px;padding:2px 8px;font-size:12px;font-weight:700;margin-left:12px}.message-container{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:8px;-webkit-overflow-scrolling:touch;touch-action:pan-y}.message{max-width:80%;padding:10px 14px;border-radius:16px;background:#2c2c2c;align-self:flex-start;word-break:break-word;color:#e0e0e0}.message.own{background:var(--accent);align-self:flex-end;color:#fff}.message.own .message-file a{color:#7bafe3}.message.own .message-time{color:#ffffffb3}.message img,.message video{max-width:200px;border-radius:10px;margin-top:6px}.message-file{display:flex;align-items:center;gap:8px}.message-file a{color:#6198cc}.message-actions{display:flex;gap:8px;margin-top:6px}.message-actions button{min-height:32px;padding:4px 10px;font-size:12px;background:#ffffff26}.message-time{font-size:11px;color:var(--text-secondary);margin-top:4px;text-align:right}.input-area{display:flex;align-items:center;gap:8px;padding:10px;padding-bottom:calc(10px + env(safe-area-inset-bottom));background:var(--bg-secondary);border-top:1px solid var(--border);touch-action:none}.input-area input[type=text]{flex:1}.input-area .attach-btn{background:transparent;color:var(--text-secondary);font-size:20px}.chat-header{position:relative;display:flex;align-items:center;padding:10px 16px;background:var(--bg-secondary);border-bottom:1px solid var(--border);min-height:56px}.chat-header strong{font-size:18px}.call-buttons{display:flex;gap:6px}.call-buttons button{min-height:36px;padding:6px 12px;font-size:14px}.typing-indicator{position:absolute;bottom:2px;left:50%;transform:translate(-50%);font-size:12px;color:var(--text-secondary);white-space:nowrap;pointer-events:none}.call-modal{position:fixed;top:0;left:0;right:0;bottom:0;background:#000000e6;z-index:1000;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff}.call-modal-videos{display:flex;gap:16px;margin:16px 0}.call-modal button{margin:8px}@media(max-width:600px){.chat-main{flex-direction:column}.sidebar{max-width:none;border-right:none;flex:1;overflow-y:auto}.chat-area{position:fixed;top:0;left:0;right:0;bottom:0;z-index:50;background:var(--bg-primary)}.sidebar.hidden-mobile,.chat-area.hidden-mobile{display:none}}@media(min-width:601px)and (max-width:900px){.sidebar{flex:0 0 260px;max-width:260px;overflow-y:auto}.chat-area{flex:1;min-width:0}.sidebar.hidden-mobile,.chat-area.hidden-mobile{display:flex!important}}@media(min-width:901px){.sidebar{flex:0 0 320px;max-width:320px;overflow-y:auto}.chat-area{flex:1;min-width:0}.sidebar.hidden-mobile,.chat-area.hidden-mobile{display:flex!important}}.mobile-call-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background-color:#0b0b0e;z-index:9999;display:flex;flex-direction:column;overflow:hidden;padding-bottom:env(safe-area-inset-bottom)}.remote-video-wrapper{position:absolute;top:0;left:0;width:100%;height:100%;z-index:1}.remote-video-fullscreen{width:100%;height:100%;object-fit:cover;position:absolute;top:0;left:0;z-index:2}.avatar-placeholder{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center;color:#fff;z-index:5;width:100%;padding:0 20px;box-sizing:border-box;pointer-events:none}.avatar-circle{width:100px;height:100px;background:linear-gradient(135deg,#6366f1,#a855f7);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:36px;font-weight:700;margin:0 auto 16px;box-shadow:0 8px 24px #0006}.local-video-pip{position:absolute;top:20px;right:20px;width:110px;height:160px;border-radius:12px;overflow:hidden;box-shadow:0 10px 25px #00000080;border:2px solid rgba(255,255,255,.2);z-index:10;background-color:#1a1a1a;transition:all .3s ease}.local-video-pip video{width:100%;height:100%;object-fit:cover}.call-controls-bar{position:absolute;bottom:0;left:0;width:100%;padding:30px 20px calc(40px + env(safe-area-inset-bottom));background:linear-gradient(to top,#000c,#0000);z-index:20;display:flex;flex-direction:column;align-items:center;gap:20px}.call-info{text-align:center;color:#fff;text-shadow:0 2px 4px rgba(0,0,0,.6)}.call-info h4{margin:0 0 4px;font-size:20px}.call-info p{margin:0;font-size:14px;opacity:.8}.btn-hangup{width:64px;height:64px;background-color:#ef4444;border:none;border-radius:50%;font-size:28px;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 15px #ef444466;transition:transform .1s ease}.btn-hangup:active{transform:scale(.9)}.mobile-incoming-call-toast{position:fixed;top:calc(16px + env(safe-area-inset-top));left:16px;right:16px;background:#1c1c23f2;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.1);padding:16px 20px;border-radius:20px;display:flex;flex-direction:column;gap:12px;box-shadow:0 15px 35px #00000080;z-index:10000;animation:slideDown .3s cubic-bezier(.16,1,.3,1);animation:toastPulse 1s infinite}@keyframes slideDown{0%{transform:translateY(-100px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes toastPulse{0%,to{transform:scale(1);box-shadow:0 0 #3b82f6b3}50%{transform:scale(1.02);box-shadow:0 0 0 10px #3b82f600}}.toast-header{display:flex;align-items:center;gap:12px;width:100%}.toast-avatar{width:48px;height:48px;min-width:48px;min-height:48px;background:#3b82f6;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:20px;flex-shrink:0;line-height:1;overflow:hidden}.toast-body{flex:1;min-width:0;overflow:hidden}.toast-body h5{margin:0 0 4px;color:#fff;font-size:16px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.toast-body p{margin:0;color:#9ca3af;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.toast-actions{display:flex;justify-content:center;gap:32px;padding-top:4px}.toast-actions button{width:64px;height:64px;border:none;border-radius:50%;font-size:28px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .1s ease}.toast-actions button:active{transform:scale(.92)}.btn-toast-decline{background-color:#ef4444;box-shadow:0 4px 12px #ef44444d}.btn-toast-accept{background-color:#22c55e;box-shadow:0 4px 12px #22c55e4d}.video-preview-clickable{position:relative;display:inline-block;background-color:#000;box-shadow:0 4px 12px #00000026}.video-preview-clickable:active{opacity:.9}.video-play-center-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:48px;height:48px;background:#000000a6;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);border-radius:50%;display:flex;align-items:center;justify-content:center;border:1px solid rgba(255,255,255,.25);pointer-events:none;z-index:3}.video-play-center-btn svg{margin-left:2px}.video-preview-clickable:hover .video-play-center-btn{background:#000c}.file-preview-floating-bar{position:absolute;bottom:100%;left:0;width:100%;background:var(--bg-primary, #1e1e24);padding:8px 14px;border-top:1px solid var(--border, rgba(255, 255, 255, .08));display:flex;align-items:center;box-shadow:0 -4px 12px #00000026;animation:slideUp .2s ease-out;z-index:10}.file-preview-badge{display:inline-flex;align-items:center;gap:8px;background:var(--bg-secondary, #2a2a35);color:#fff;padding:6px 14px;border-radius:20px;border:1px solid rgba(255,255,255,.1);max-width:85%}.file-preview-name{font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-preview-close-btn{background:#ffffff26!important;border:none;color:#fff;border-radius:50%;width:18px;height:18px;display:flex;align-items:center;justify-content:center;font-size:10px;cursor:pointer;padding:0;font-weight:700;transform:none!important}.file-preview-close-btn:hover{background:#ffffff4d!important}.send-message-btn{transition:background-color .2s,transform .1s,opacity .2s}.send-message-btn:hover{background-color:var(--accent-light, #60a5fa)!important;transform:scale(1.05);opacity:1}.send-message-btn:active{transform:scale(.95)}@keyframes slideUp{0%{transform:translateY(10px);opacity:0}to{transform:translateY(0);opacity:1}}.image-lightbox-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background-color:#000000f2;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:10002;display:flex;align-items:center;justify-content:center;animation:fadeInLightbox .2s ease-out}@keyframes fadeInLightbox{0%{opacity:0}to{opacity:1}}.close-lightbox-btn{position:absolute;top:20px;right:20px;background:#ffffff1a;border:none;color:#fff;font-size:20px;width:44px;height:44px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:10003;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);transition:background .2s}.close-lightbox-btn:active{background:#ffffff4d}.lightbox-content{max-width:95vw;max-height:85vh;display:flex;align-items:center;justify-content:center;animation:scaleImage .25s cubic-bezier(.16,1,.3,1)}@keyframes scaleImage{0%{transform:scale(.9)}to{transform:scale(1)}}.lightbox-image-fullscreen{max-width:100%;max-height:100%;object-fit:contain;border-radius:4px;box-shadow:0 10px 40px #000c}.clickable-chat-image:active{opacity:.8}.forward-modal-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;height:100dvh;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:10001;display:flex;align-items:center;justify-content:center;padding:20px;padding-bottom:calc(20px + env(safe-area-inset-bottom))}.forward-bottom-sheet{width:100%;max-width:400px;max-height:70vh;background:var(--bg-primary, #1c1c24);border-radius:24px;padding:20px;display:flex;flex-direction:column;animation:scaleIn .2s cubic-bezier(.16,1,.3,1);box-shadow:0 -10px 30px #0000004d;border:1px solid rgba(255,255,255,.1);overflow:hidden}@keyframes scaleIn{0%{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}.sheet-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;color:#fff}.sheet-header h3{margin:0;font-size:18px}.close-sheet-btn{background:transparent;border:none;color:#888;font-size:20px;cursor:pointer}.sheet-body{overflow-y:auto;display:flex;flex-direction:column;gap:8px;max-height:50vh}.action-sheet-overlay{position:fixed;top:0;left:0;width:100%;height:100vh;height:100dvh;background:#0006;z-index:4000;display:flex;align-items:center;justify-content:center;padding:20px;padding-bottom:calc(20px + env(safe-area-inset-bottom))}.action-sheet-body{width:100%;max-width:400px;background:var(--bg-secondary, #1e1e24);border-radius:20px;padding:16px;box-shadow:0 -4px 24px #0000004d;max-height:70vh;overflow-y:auto}.forward-chat-item{display:flex;align-items:center;gap:12px;padding:10px;border-radius:12px;cursor:pointer;background:#ffffff08;transition:background .2s ease}.forward-chat-item:strong-active,.forward-chat-item:hover{background:#ffffff14}.forward-chat-avatar{width:40px;height:40px;background:#4f46e5;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700}.forward-chat-name{flex:1;color:#fff;font-size:15px}.btn-send-forward{background:transparent;border:none;color:#4f46e5;font-size:18px}.chat-date-divider-container{display:flex;justify-content:center;align-items:center;margin:24px 0 16px;width:100%}.chat-date-divider-text{background:var(--bg-secondary, rgba(255, 255, 255, .08));color:var(--text-secondary, #8e8e93);font-size:12px;font-weight:500;padding:4px 14px;border-radius:12px;box-shadow:0 1px 2px #0000000d;text-transform:lowercase}.chat-date-divider-text:first-letter{text-transform:uppercase}*{scrollbar-width:thin;scrollbar-color:var(--border) transparent}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#555}textarea{overflow:hidden;-webkit-overflow-scrolling:auto;scrollbar-color:var(--border) transparent}textarea::-webkit-scrollbar{width:4px}textarea::-webkit-scrollbar-thumb{background:var(--border)}.input-area textarea{scrollbar-width:none;overflow-y:auto;scrollbar-width:thin;-webkit-overflow-scrolling:touch}.input-area textarea::-webkit-scrollbar{width:3px}.input-area textarea::-webkit-scrollbar-thumb{background:transparent}.input-area textarea:focus::-webkit-scrollbar-thumb{background:var(--border)}.attach-btn,button{transition:opacity .2s,background-color .2s,transform .1s}.attach-btn:hover{opacity:.8;cursor:pointer}button:hover{opacity:.9;transform:scale(1.03)}button[type=button]:hover,button[type=submit]:hover{background-color:var( --accent-light );opacity:1}.message-actions button:hover{transform:none;opacity:.8}.send-message-btn{flex-shrink:0;width:34px;height:34px;min-height:36px;min-width:36px;border-radius:50%;background:var(--button-bg, #3b82f6);color:var(--button-text, #fff);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;margin-bottom:2px;padding:0 0 0 2px}