:root{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--bg-card: #1e293b;--accent: #6366f1;--accent-hover: #818cf8;--accent-light: rgba(99,102,241,.15);--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--border: #334155;--success: #22c55e;--error: #ef4444;--warning: #f59e0b;--radius: 12px;--radius-sm: 8px;--radius-lg: 16px;--shadow: 0 4px 24px rgba(0,0,0,.3);--transition: all .2s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;width:100%;overflow:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,sans-serif;background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased}.app-container{height:100%;width:100%;position:relative;overflow:hidden;display:flex;flex-direction:column}.page{display:flex;flex-direction:column;height:100%;padding:0}.page-header{padding:20px 24px 16px;background:var(--bg-secondary);border-bottom:1px solid var(--border)}.page-header h1{font-size:24px;font-weight:700;margin-bottom:4px}.page-header p{font-size:14px;color:var(--text-secondary)}.page-content{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:20px}@media (min-width: 768px){.page{max-width:480px;margin:0 auto;border-left:1px solid var(--border);border-right:1px solid var(--border)}}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;gap:16px;color:var(--text-secondary)}.loading-center{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px;gap:12px;color:var(--text-secondary);font-size:14px}.spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.brand{display:flex;align-items:center;gap:12px;margin-bottom:24px}.brand-icon{width:48px;height:48px;border-radius:var(--radius);background:linear-gradient(135deg,var(--accent),#8b5cf6);display:flex;align-items:center;justify-content:center;font-size:24px;color:#fff;flex-shrink:0}.brand-text h2{font-size:20px;font-weight:700}.brand-text span{font-size:12px;color:var(--text-muted);letter-spacing:1px;text-transform:uppercase}.version-tag{margin-left:auto;padding:4px 10px;border-radius:12px;background:var(--accent-light);color:var(--accent);font-size:12px;font-weight:700;white-space:nowrap}.form-group{display:flex;flex-direction:column;gap:6px}.form-label{font-size:13px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px}.form-input{width:100%;padding:14px 16px;background:var(--bg-tertiary);border:1.5px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:16px;outline:none;transition:var(--transition)}.form-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}.form-input::placeholder{color:var(--text-muted)}.form-input.input-error,.otp-input.input-error{border-color:var(--error)}.form-input.input-error:focus{box-shadow:0 0 0 3px #ef444426}.form-hint{font-size:12px;color:var(--text-muted)}.phone-input-group{display:flex;gap:8px}.phone-prefix{flex-shrink:0;text-align:center;padding:14px 8px;background:var(--bg-tertiary);border:1.5px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:15px;font-weight:600}select.phone-prefix{-moz-appearance:none;appearance:none;-webkit-appearance:none;cursor:pointer;min-width:90px}.phone-input-group .form-input{flex:1}.error-banner{color:var(--error);font-size:14px;text-align:center;padding:10px 16px;background:#ef44441a;border-radius:var(--radius-sm);border:1px solid rgba(239,68,68,.2)}.btn{width:100%;padding:14px 24px;border:none;border-radius:var(--radius-sm);font-size:16px;font-weight:600;cursor:pointer;transition:var(--transition);display:flex;align-items:center;justify-content:center;gap:8px}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:linear-gradient(135deg,var(--accent),#8b5cf6);color:#fff;box-shadow:0 4px 12px #6366f14d}.btn-primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 6px 20px #6366f166}.btn-ghost{background:transparent;color:var(--accent);padding:8px}.otp-container{display:flex;gap:8px;justify-content:center;margin:8px 0}.otp-input{width:48px;height:56px;text-align:center;font-size:24px;font-weight:700;background:var(--bg-tertiary);border:1.5px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);outline:none;transition:var(--transition)}.otp-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}.method-selector{display:flex;gap:8px;margin:8px 0}.method-btn{flex:1;padding:12px;background:var(--bg-tertiary);border:1.5px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:14px;font-weight:600;cursor:pointer;transition:var(--transition);text-align:center}.method-btn.active{border-color:var(--accent);color:var(--accent);background:var(--accent-light)}.avatar-upload{width:120px;height:120px;border-radius:50%;margin:0 auto;background:var(--bg-tertiary);border:3px dashed var(--border);display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition);overflow:hidden}.avatar-upload:hover{border-color:var(--accent)}.avatar-upload img{width:100%;height:100%;object-fit:cover}.avatar-upload .avatar-placeholder{font-size:36px;color:var(--text-muted)}.avatar-upload .avatar-label{font-size:11px;color:var(--text-muted);margin-top:4px}.chat-layout-2col{display:flex;height:100%;width:100%;overflow:hidden}.chat-sidebar{display:flex;flex-direction:column;height:100%;width:100%;background:var(--bg-secondary);overflow:hidden}.sidebar-header{padding:16px 20px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);flex-shrink:0}.sidebar-header h2{font-size:20px;font-weight:700}.header-actions{display:flex;align-items:center;gap:8px}.new-chat-btn{background:var(--accent-light)!important;color:var(--accent)!important}.user-banner{padding:12px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:12px;flex-shrink:0}.search-panel{border-bottom:1px solid var(--border)}.search-panel .search-wrapper{display:flex;align-items:center;gap:8px;padding:8px 16px}.search-panel .search-box{flex:1}.search-wrapper{padding:0 16px;margin:8px 0}.search-box{width:100%;padding:10px 16px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:24px;color:var(--text-primary);font-size:14px;outline:none}.search-box:focus{border-color:var(--accent)}.search-box::placeholder{color:var(--text-muted)}.contact-list{flex:1;overflow-y:auto;min-height:0}.contact-item{display:flex;align-items:center;gap:12px;padding:14px 20px;cursor:pointer;transition:var(--transition);border-bottom:1px solid rgba(51,65,85,.3)}.contact-item:hover,.contact-item.active{background:var(--accent-light)}.contact-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#6366f1,#a78bfa);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700;color:#fff;flex-shrink:0}.contact-info{flex:1;min-width:0}.contact-name{font-size:15px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.contact-last-msg{font-size:13px;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.contact-meta{text-align:right;flex-shrink:0}.contact-time{font-size:11px;color:var(--text-muted)}.contact-badge{background:var(--accent);color:#fff;font-size:11px;font-weight:700;padding:2px 7px;border-radius:10px;margin-top:4px;display:inline-block}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px;color:var(--text-muted);text-align:center}.empty-state h3{color:var(--text-secondary);margin-bottom:8px}.empty-state p{font-size:14px}.chat-main{display:none;flex-direction:column;height:100%;flex:1;min-width:0;background:var(--bg-primary)}.chat-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--text-muted);text-align:center;padding:20px}.chat-empty h3{color:var(--text-secondary);margin-bottom:8px}.chat-empty p{font-size:14px}.chat-header{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-secondary);border-bottom:1px solid var(--border);flex-shrink:0}.chat-header-avatar{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--accent),#8b5cf6);display:flex;align-items:center;justify-content:center;font-size:18px;color:#fff;font-weight:700;flex-shrink:0}.chat-header-info{flex:1;min-width:0}.chat-header-info h3{font-size:16px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-header-info span{font-size:12px;color:var(--success)}.icon-btn{width:36px;height:36px;border:none;border-radius:50%;background:var(--bg-tertiary);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition);font-size:16px;flex-shrink:0}.icon-btn:hover{background:var(--accent-light);color:var(--accent)}.messages-area{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:8px;background:var(--bg-primary);min-height:0}.e2ee-banner{text-align:center;font-size:12px;color:var(--success);padding:10px 16px;background:#22c55e14;border-radius:var(--radius-lg);margin-bottom:8px}.message-bubble{max-width:75%;padding:10px 14px;border-radius:var(--radius-lg);font-size:15px;line-height:1.4;word-break:break-word;animation:fadeIn .2s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.message-sent{align-self:flex-end;background:linear-gradient(135deg,var(--accent),#7c3aed);color:#fff;border-bottom-right-radius:4px}.message-received{align-self:flex-start;background:var(--bg-secondary);color:var(--text-primary);border-bottom-left-radius:4px}.message-sender{font-size:12px;font-weight:600;color:var(--accent-hover);margin-bottom:2px}.message-time{font-size:11px;margin-top:4px;opacity:.6;text-align:right}.message-status{margin-left:4px}.message-system{align-self:center;background:var(--accent-light);color:var(--text-secondary);font-size:13px;padding:6px 16px;border-radius:20px;max-width:90%;text-align:center}.typing-indicator{display:flex;gap:4px;padding:12px 16px!important}.typing-indicator .dot{width:8px;height:8px;background:var(--text-muted);border-radius:50%;animation:typingDot 1.4s infinite ease-in-out}.typing-indicator .dot:nth-child(2){animation-delay:.2s}.typing-indicator .dot:nth-child(3){animation-delay:.4s}@keyframes typingDot{0%,80%,to{transform:scale(.6);opacity:.4}40%{transform:scale(1);opacity:1}}.message-composer{display:flex;align-items:flex-end;gap:8px;padding:12px 16px;background:var(--bg-secondary);border-top:1px solid var(--border);flex-shrink:0}.composer-input{flex:1;padding:10px 16px;background:var(--bg-tertiary);border:1.5px solid var(--border);border-radius:24px;color:var(--text-primary);font-size:15px;outline:none;resize:none;max-height:120px;min-height:40px;font-family:inherit;transition:var(--transition)}.composer-input:focus{border-color:var(--accent)}.send-btn{width:42px;height:42px;border:none;border-radius:50%;background:linear-gradient(135deg,var(--accent),#8b5cf6);color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition);flex-shrink:0;font-size:18px}.send-btn:hover{transform:scale(1.05)}.send-btn:disabled{opacity:.4;cursor:not-allowed;transform:none}.settings-wrapper{position:relative}.settings-btn{width:36px;height:36px;border:none;border-radius:50%;background:var(--bg-tertiary);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:var(--transition);font-size:18px}.settings-btn:hover{background:var(--accent-light);color:var(--accent)}.settings-menu{position:absolute;top:44px;right:0;min-width:200px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);box-shadow:var(--shadow);z-index:100;overflow:hidden;animation:menuFadeIn .15s ease}@keyframes menuFadeIn{0%{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.settings-menu-item{display:flex;align-items:center;gap:10px;padding:12px 16px;font-size:14px;color:var(--text-primary);cursor:pointer;transition:var(--transition);border:none;background:none;width:100%;text-align:left}.settings-menu-item:hover{background:var(--accent-light)}.settings-menu-item .menu-icon{font-size:16px;width:20px;text-align:center}.settings-menu-divider{height:1px;background:var(--border);margin:4px 0}.settings-menu-item.danger{color:var(--error)}.settings-menu-item.danger:hover{background:#ef44441a}.settings-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:99}.e2ee-badge{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--success);justify-content:center;padding:8px;background:#22c55e14;border-radius:var(--radius-sm)}.toast{position:fixed;bottom:80px;left:50%;transform:translate(-50%);background:var(--bg-card);color:var(--text-primary);padding:12px 24px;border-radius:24px;font-size:14px;box-shadow:var(--shadow);z-index:1000;animation:toastIn .3s ease;white-space:nowrap}@keyframes toastIn{0%{opacity:0;transform:translate(-50%,20px)}to{opacity:1;transform:translate(-50%)}}.toast.error{border-left:3px solid var(--error)}.toast.success{border-left:3px solid var(--success)}.toast.info{border-left:3px solid var(--accent)}.divider{display:flex;align-items:center;gap:12px;margin:8px 0;color:var(--text-muted);font-size:13px}.divider:before,.divider:after{content:"";flex:1;height:1px;background:var(--border)}.features-list{display:flex;flex-direction:column;gap:12px;margin-top:8px}.feature-item{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-card);border-radius:var(--radius-sm);border:1px solid var(--border)}.feature-icon{width:36px;height:36px;border-radius:50%;background:var(--accent-light);display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}.feature-text{font-size:13px;color:var(--text-secondary)}.feature-text strong{color:var(--text-primary);display:block;font-size:14px;margin-bottom:2px}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}@media (max-width: 899px){.chat-sidebar,.chat-main{width:100%}.chat-sidebar.mobile-hidden,.chat-main.mobile-hidden{display:none!important}.chat-main:not(.mobile-hidden){display:flex}.back-btn{display:flex}.message-bubble{max-width:85%}}@media (min-width: 900px){.chat-layout-2col{flex-direction:row}.chat-sidebar{width:380px;min-width:320px;max-width:380px;border-right:1px solid var(--border);flex-shrink:0}.chat-sidebar.mobile-hidden,.chat-main,.chat-main.mobile-hidden{display:flex!important}.back-btn{display:none!important}.message-bubble{max-width:60%}}@supports (padding-top: env(safe-area-inset-top)){.page-header,.chat-header,.sidebar-header{padding-top:calc(12px + env(safe-area-inset-top))}.message-composer{padding-bottom:calc(12px + env(safe-area-inset-bottom))}}