:root{--primary: #00a884;--primary-dark: #008069;--bg-app: #f0f2f5;--bg-chat: #efeae2;--text-main: #111b21;--text-secondary: #667781;--white: #ffffff;--bubble-me: #d9fdd3;--bubble-other: #ffffff;--shadow-sm: 0 1px .5px rgba(11, 20, 26, .13);--shadow-md: 0 2px 5px 0 rgba(11, 20, 26, .26);--transition-fast: .2s ease;--grad-premium: linear-gradient(135deg, #00a884 0%, #02e7b5 100%);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;font-family:var(--font-sans);line-height:1.5;font-weight:400;color-scheme:light dark;color:var(--text-main);background-color:var(--bg-app);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media(prefers-color-scheme:dark){:root{--bg-app: #111b21;--bg-chat: #0b141a;--text-main: #e9edef;--text-secondary: #8696a0;--white: #202c33;--bubble-me: #005c4b;--bubble-other: #202c33;--primary: #00a884}}*{box-sizing:border-box;margin:0;padding:0}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh;background-color:var(--bg-app);overflow:hidden}#root{width:100%;height:100vh;max-width:500px;margin:0 auto;display:flex;flex-direction:column;background-color:var(--bg-chat);position:relative;box-shadow:var(--shadow-md)}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.animate-slide-up{animation:slideUp var(--transition-fast) forwards}.animate-fade-in{animation:fadeIn var(--transition-fast) forwards}.glass-header{background:#fffc;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid rgba(0,0,0,.05)}@media(prefers-color-scheme:dark){.glass-header{background:#202c33cc;border-bottom:1px solid rgba(255,255,255,.05)}}:root{--primary: #128C7E;--secondary: #25D366;--bg-app: #f0f2f5;--bg-chat: #efeae2;--white: #ffffff;--text-primary: #111b21;--text-secondary: #667781;--bubble-me: #d9fdd3;--bubble-other: #ffffff;--shadow-sm: 0 1px .5px rgba(11,20,26,.13);--transition-fast: .2s ease}html,body,#root{height:100%;margin:0;padding:0;overflow:hidden;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:var(--bg-app)}.app-container,.chat-window{display:flex;flex-direction:column;height:100%;width:100%;background:var(--bg-chat);position:relative}.chat-list-header,.chat-header{padding:10px 16px;display:flex;align-items:center;gap:12px;z-index:10}.chat-list-header h1{font-size:22px;color:var(--primary);flex-grow:1}.header-actions{display:flex;gap:15px}.icon-btn,.back-btn{background:none;border:none;font-size:20px;cursor:pointer;color:var(--text-secondary);display:flex;align-items:center;justify-content:center}.search-container{padding:8px 16px;background:var(--bg-app)}.search-input{width:100%;padding:8px 16px;border-radius:8px;border:none;background:var(--white);font-size:14px}.chat-list{flex-grow:1;overflow-y:auto;background:var(--white)}.chat-item{display:flex;padding:12px 16px;gap:12px;cursor:pointer;transition:background var(--transition-fast);border-bottom:1px solid rgba(0,0,0,.05)}.chat-item:hover{background:var(--bg-app)}.avatar{width:48px;height:48px;border-radius:50%;object-fit:cover}.avatar-sm{width:36px;height:36px;border-radius:50%}.chat-info{flex-grow:1;display:flex;flex-direction:column;justify-content:center;gap:4px}.chat-top,.chat-bottom{display:flex;justify-content:space-between;align-items:center}.contact-name{font-weight:600;font-size:16px}.chat-time{font-size:12px;color:var(--text-secondary)}.last-message{font-size:14px;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:200px}.unread-badge{background:var(--primary);color:#fff;font-size:11px;font-weight:700;min-width:18px;height:18px;border-radius:50%;display:flex;align-items:center;justify-content:center;padding:0 4px}.login-container{height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#075e54,#128c7e);padding:20px}.login-card{width:100%;max-width:400px;padding:40px 30px;text-align:center;color:#fff}.logo-section h1{margin:15px 0 5px;font-size:2.5rem}.logo-icon{font-size:4rem}.login-card form{margin-top:30px;display:flex;flex-direction:column;gap:15px}.login-card input{padding:15px;border-radius:12px;border:none;background:#ffffff1a;color:#fff;font-size:1rem;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);border:1px solid rgba(255,255,255,.2)}.login-card input::placeholder{color:#fff9}.login-btn{padding:15px;border-radius:12px;border:none;background:#25d366;color:#fff;font-weight:700;font-size:1.1rem;cursor:pointer;transition:transform .2s}.login-btn:hover{transform:scale(1.02)}.sender-name{display:block;font-size:.75rem;font-weight:700;color:#128c7e;margin-bottom:4px}.loading{height:100vh;display:flex;align-items:center;justify-content:center;background:#111b21;color:#fff;font-size:1.2rem}.bottom-nav{display:flex;justify-content:space-around;padding:8px 0;background:var(--white);border-top:1px solid rgba(0,0,0,.05)}.nav-item{display:flex;flex-direction:column;align-items:center;font-size:12px;color:var(--text-secondary);gap:4px}.nav-item.active{color:var(--primary)}.nav-item span{font-weight:500}.contact-status{flex-grow:1;display:flex;flex-direction:column}.contact-status .name{font-weight:600;font-size:16px}.contact-status .status{font-size:12px;color:var(--primary)}.message-list{flex-grow:1;padding:16px;display:flex;flex-direction:column;gap:8px;overflow-y:auto;background-image:url(https://user-images.githubusercontent.com/15075759/28719144-86dc0f70-73b1-11e7-911d-60d70fcded21.png);background-blend-mode:overlay}.message-bubble{max-width:80%;padding:6px 10px;border-radius:8px;position:relative;box-shadow:var(--shadow-sm);display:flex;flex-direction:column}.message-bubble.me{align-self:flex-end;background:var(--bubble-me)}.message-bubble.other{align-self:flex-start;background:var(--bubble-other)}.message-bubble .text{color:#111b21;font-size:14.5px;line-height:1.4;word-wrap:break-word;white-space:pre-wrap}.message-bubble .time{font-size:11px;color:#667781;align-self:flex-end;margin-top:2px;display:flex;align-items:center;gap:2px}.chat-input-area{padding:10px 16px;display:flex;align-items:center;gap:12px;background:#f0f2f5;border-top:1px solid rgba(0,0,0,.05)}.input-wrapper{flex-grow:1;background:#fff;border-radius:20px;padding:0 12px;display:flex;align-items:center}.input-wrapper input{width:100%;padding:10px 0;border:none;background:transparent;font-size:15px;color:#111b21;outline:none}.input-wrapper input::placeholder{color:#667781}.message-bubble.image,.message-bubble.video{padding:4px}.clickable-media{width:100%;max-width:250px;border-radius:6px;cursor:pointer}.video-preview{width:100%;max-width:250px;aspect-ratio:16/9;background:#000;border-radius:6px;position:relative;overflow:hidden;cursor:pointer}.video-preview video{width:100%;height:100%;object-fit:cover;opacity:.7}.play-icon{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:#00000080;color:#fff;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;z-index:2}.audio-bubble{display:flex;align-items:center;gap:10px;padding:4px 8px}.play-btn{background:none;border:none;font-size:20px;color:var(--primary);cursor:pointer}.waveform{display:flex;align-items:center;gap:2px;flex-grow:1}.bar{width:3px;background:var(--text-secondary);border-radius:2px}.duration{font-size:11px;color:var(--text-secondary)}.recording{background:#ff4b4b!important;animation:pulse 1s infinite}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.1)}to{transform:scale(1)}}.media-viewer{position:fixed;top:0;left:0;width:100%;height:100%;background:#000;display:flex;align-items:center;justify-content:center;z-index:100}.media-viewer img,.media-viewer video{max-width:100%;max-height:100%}.close-media{position:absolute;top:20px;left:20px;background:#fff3;border:none;color:#fff;width:40px;height:40px;border-radius:50%;font-size:20px;cursor:pointer;z-index:101}