:root{--bg-primary: #ffffff;--bg-secondary: #f5f5f7;--bg-tertiary: #fafafa;--bg-elevated: #ffffff;--accent-blue: #007aff;--accent-blue-hover: #0051d5;--accent-green: #34c759;--accent-red: #ff3b30;--text-primary: #000000;--text-secondary: #86868b;--text-tertiary: #aeaeb2;--text-quaternary: #d1d1d6;--separator: rgba(60, 60, 67, .12);--separator-opaque: #d1d1d6;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .04);--shadow-md: 0 2px 8px rgba(0, 0, 0, .06);--shadow-lg: 0 4px 16px rgba(0, 0, 0, .08);--spacing-xs: .5rem;--spacing-sm: .75rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--radius-sm: 10px;--radius-md: 12px;--radius-lg: 18px;--radius-xl: 22px;--radius-2xl: 28px}*{margin:0;padding:0;box-sizing:border-box;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,SF Pro Text,Helvetica Neue,sans-serif;background:var(--bg-secondary);color:var(--text-primary);min-height:100vh;overflow:hidden;font-size:15px;line-height:1.47059;letter-spacing:-.022em}.app-container{display:grid;grid-template-columns:340px 1fr 380px;height:100vh;gap:0;background:var(--bg-secondary)}.left-panel,.center-panel,.right-panel{background:var(--bg-elevated);overflow:hidden;position:relative}.left-panel,.center-panel{display:flex;flex-direction:column;border-right:1px solid var(--separator)}.right-panel{overflow-y:auto;scrollbar-width:none}.right-panel::-webkit-scrollbar{display:none}.panel-header{padding:var(--spacing-lg) var(--spacing-xl);display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--separator);background:var(--bg-elevated)}.logo{font-size:28px;font-weight:700;letter-spacing:-.04em;color:var(--text-primary)}.user-profile .avatar-mini{width:36px;height:36px;border-radius:50%;object-fit:cover;cursor:pointer;transition:all .2s ease;box-shadow:var(--shadow-sm);border:2px solid var(--bg-secondary)}.user-profile .avatar-mini:hover{transform:scale(1.05);box-shadow:var(--shadow-md)}.search-bar{padding:var(--spacing-md) var(--spacing-xl);background:var(--bg-elevated);border-bottom:1px solid var(--separator);position:relative}.search-bar input{width:100%;background:var(--bg-secondary);border:none;border-radius:var(--radius-sm);padding:9px 12px 9px 36px;color:var(--text-primary);font-size:15px;outline:none;transition:all .2s ease}.search-bar input:focus{background:var(--bg-tertiary)}.search-bar input::placeholder{color:var(--text-tertiary)}.search-bar svg{position:absolute;left:calc(var(--spacing-xl) + 10px);top:50%;transform:translateY(-50%);color:var(--text-tertiary);pointer-events:none}.contacts-list{flex:1;overflow-y:auto;scrollbar-width:none}.contacts-list::-webkit-scrollbar{display:none}.contact-item{padding:var(--spacing-md) var(--spacing-xl);display:flex;gap:var(--spacing-md);cursor:pointer;transition:background .15s ease;border-bottom:1px solid var(--separator);position:relative}.contact-item:hover,.contact-item.active{background:var(--bg-secondary)}.contact-item.active:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent-blue)}.contact-avatar{width:52px;height:52px;border-radius:50%;object-fit:cover;flex-shrink:0;box-shadow:var(--shadow-sm)}.contact-info{flex:1;min-width:0}.contact-name{font-size:16px;font-weight:600;color:var(--text-primary);margin-bottom:4px;display:flex;align-items:center;gap:6px;letter-spacing:-.02em}.online-status{width:8px;height:8px;border-radius:50%;background:var(--accent-green);box-shadow:0 0 0 2px var(--bg-elevated)}.contact-preview{font-size:14px;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;line-height:1.3}.contact-meta{text-align:right;display:flex;flex-direction:column;align-items:flex-end;gap:6px}.contact-time{font-size:13px;color:var(--text-tertiary)}.unread-badge{background:var(--accent-blue);color:#fff;font-size:12px;font-weight:600;padding:2px 7px;border-radius:10px;min-width:20px;text-align:center}.chat-header{padding:var(--spacing-md) var(--spacing-xl);display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--separator);background:var(--bg-elevated);min-height:68px}.chat-header-info{display:flex;align-items:center;gap:var(--spacing-md)}.chat-avatar{width:40px;height:40px;border-radius:50%;object-fit:cover;box-shadow:var(--shadow-sm)}.chat-header-text h2{font-size:17px;font-weight:600;margin-bottom:2px;letter-spacing:-.02em}.chat-header-text p{font-size:13px;color:var(--text-secondary)}.chat-header-actions{display:flex;gap:8px}.icon-btn{width:36px;height:36px;border-radius:50%;background:var(--bg-secondary);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s ease;color:var(--accent-blue)}.icon-btn:hover{background:var(--bg-tertiary);transform:scale(1.05)}.icon-btn:active{transform:scale(.95)}.chat-messages{flex:1;overflow-y:auto;padding:var(--spacing-xl);display:flex;flex-direction:column;gap:var(--spacing-md);background:var(--bg-secondary);scrollbar-width:none}.chat-messages::-webkit-scrollbar{display:none}.welcome-screen{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--spacing-md);padding:var(--spacing-2xl)}.welcome-icon{font-size:64px;opacity:.15;margin-bottom:var(--spacing-md)}.welcome-screen h3{font-size:22px;font-weight:600;color:var(--text-primary);letter-spacing:-.02em}.welcome-screen p{font-size:15px;color:var(--text-secondary);text-align:center}.message{display:flex;gap:10px;animation:message-slide-in .25s ease-out}@keyframes message-slide-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.message.sent{flex-direction:row-reverse}.message-avatar{width:32px;height:32px;border-radius:50%;object-fit:cover;flex-shrink:0}.message-content{max-width:65%}.message-bubble{padding:10px 14px;border-radius:var(--radius-lg);font-size:15px;line-height:1.47;word-wrap:break-word}.message.received .message-bubble{background:var(--bg-elevated);color:var(--text-primary);border-bottom-left-radius:6px;box-shadow:var(--shadow-sm)}.message.sent .message-bubble{background:var(--accent-blue);color:#fff;border-bottom-right-radius:6px}.message-time{font-size:12px;color:var(--text-tertiary);margin-top:4px;padding:0 6px}.message.sent .message-time{text-align:right}.chat-input-area{padding:var(--spacing-md) var(--spacing-xl);display:flex;gap:8px;align-items:center;border-top:1px solid var(--separator);background:var(--bg-elevated)}.chat-input-area input{flex:1;background:var(--bg-secondary);border:1px solid var(--separator);border-radius:var(--radius-xl);padding:10px 16px;color:var(--text-primary);font-size:15px;outline:none;transition:all .15s ease}.chat-input-area input:focus{background:var(--bg-elevated);border-color:var(--accent-blue)}.chat-input-area input::placeholder{color:var(--text-tertiary)}.send-btn{width:36px;height:36px;border-radius:50%;background:var(--accent-blue);border:none;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s ease;color:#fff}.send-btn:hover{background:var(--accent-blue-hover);transform:scale(1.05)}.send-btn:active{transform:scale(.95)}.profile-section{padding:var(--spacing-2xl) var(--spacing-xl);text-align:center;border-bottom:1px solid var(--separator);background:var(--bg-elevated)}.profile-avatar-large{width:100px;height:100px;margin:0 auto var(--spacing-lg);border-radius:50%;position:relative}.profile-avatar-large img{width:100%;height:100%;border-radius:50%;object-fit:cover;box-shadow:var(--shadow-lg)}.profile-section h2{font-size:24px;font-weight:700;margin-bottom:6px;letter-spacing:-.03em}.profile-section p{font-size:15px;color:var(--text-secondary);margin-bottom:var(--spacing-xl);line-height:1.4}.profile-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-lg);margin-top:var(--spacing-xl);padding-top:var(--spacing-xl);border-top:1px solid var(--separator)}.stat-item{text-align:center}.stat-value{font-size:28px;font-weight:700;color:var(--text-primary);margin-bottom:4px;letter-spacing:-.03em}.stat-label{font-size:12px;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.06em}.details-section{padding:var(--spacing-xl)}.detail-group{margin-bottom:var(--spacing-xl)}.detail-group h3{font-size:13px;font-weight:600;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.06em;margin-bottom:var(--spacing-md)}.detail-item{display:flex;justify-content:space-between;padding:var(--spacing-md) 0;border-bottom:1px solid var(--separator)}.detail-item:last-child{border-bottom:none}.detail-label{font-size:15px;color:var(--text-secondary)}.detail-value{font-size:15px;color:var(--text-primary);font-weight:500;text-align:right}.media-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:var(--spacing-sm)}.media-item{aspect-ratio:1;background:var(--bg-secondary);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:24px;cursor:pointer;transition:all .2s ease;border:1px solid var(--separator);position:relative;overflow:hidden}.media-item:before{content:"";position:absolute;top:0;left:0;width:100%;height:100%;background:var(--accent-blue);opacity:0;transition:opacity .2s ease}.media-item:hover{background:var(--bg-tertiary);transform:scale(1.05);box-shadow:var(--shadow-sm)}.media-item:hover:before{opacity:.05}.media-item:active{transform:scale(.95)}.media-item span{position:relative;z-index:1}.modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:#00000080;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);z-index:1000;align-items:center;justify-content:center;animation:modal-fade-in .2s ease-out}.modal.active{display:flex}@keyframes modal-fade-in{0%{opacity:0}to{opacity:1}}.modal-content{background:var(--bg-elevated);border-radius:var(--radius-2xl);padding:var(--spacing-xl);max-width:600px;width:90%;box-shadow:var(--shadow-lg);animation:modal-slide-up .3s ease-out}@keyframes modal-slide-up{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.video-call-container{max-width:700px}.video-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-lg);padding-bottom:var(--spacing-md);border-bottom:1px solid var(--separator)}.video-header h3{font-size:20px;font-weight:600;letter-spacing:-.02em}.call-timer{font-family:-apple-system,BlinkMacSystemFont,SF Mono,monospace;font-size:15px;color:var(--text-secondary);background:var(--bg-secondary);padding:6px 12px;border-radius:var(--radius-sm)}.video-display{position:relative;background:var(--bg-secondary);border-radius:var(--radius-lg);overflow:hidden;aspect-ratio:16/9;margin-bottom:var(--spacing-lg)}.video-display img{width:100%;height:100%;object-fit:cover}.video-overlay{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:#0003}.connection-status{background:#fffffff2;color:var(--text-primary);padding:10px 20px;border-radius:var(--radius-md);font-weight:500;box-shadow:var(--shadow-md)}.video-controls{display:flex;justify-content:center;gap:var(--spacing-md)}.video-btn{width:50px;height:50px;border-radius:50%;border:none;background:var(--bg-secondary);color:var(--text-primary);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s ease}.video-btn:hover{background:var(--bg-tertiary);transform:scale(1.05)}.video-btn:active{transform:scale(.95)}.video-btn.muted{opacity:.5;background:var(--bg-tertiary)}.end-call-btn{background:var(--accent-red);color:#fff}.end-call-btn:hover{background:#d70015;transform:scale(1.05)}.voice-call-container{text-align:center;max-width:400px}.voice-avatar-large{width:140px;height:140px;margin:0 auto var(--spacing-2xl);position:relative;display:flex;align-items:center;justify-content:center}.voice-avatar-large img{width:100%;height:100%;border-radius:50%;object-fit:cover;box-shadow:var(--shadow-lg);position:relative;z-index:2}.pulse-ring{position:absolute;width:100%;height:100%;border:2px solid var(--accent-green);border-radius:50%;opacity:0;animation:pulse-ring 1.5s ease-out infinite}.pulse-ring.delay-1{animation-delay:.4s}.pulse-ring.delay-2{animation-delay:.8s}@keyframes pulse-ring{0%{transform:scale(1);opacity:.6}to{transform:scale(1.4);opacity:0}}.voice-call-container h2{font-size:26px;font-weight:700;margin-bottom:var(--spacing-sm);letter-spacing:-.03em}.call-status{font-size:15px;color:var(--text-secondary);margin-bottom:var(--spacing-md)}.voice-controls{display:flex;justify-content:center;gap:var(--spacing-lg);margin-top:var(--spacing-2xl)}.voice-btn{width:56px;height:56px;border-radius:50%;border:none;background:var(--bg-secondary);color:var(--text-primary);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s ease}.voice-btn:hover{background:var(--bg-tertiary);transform:scale(1.05)}.voice-btn:active{transform:scale(.95)}.voice-btn.muted{opacity:.5;background:var(--bg-tertiary)}.end-voice-call-btn{background:var(--accent-red);color:#fff;width:64px;height:64px}.end-voice-call-btn:hover{background:#d70015;transform:scale(1.05)}@media(max-width:1200px){.app-container{grid-template-columns:320px 1fr}.right-panel{display:none}}@media(max-width:768px){.app-container{grid-template-columns:1fr}.left-panel,.right-panel{display:none}}