:root,[data-theme=light]{--bg-primary: #ffffff;--bg-secondary: #f4f4f5;--bg-chat: #e6ebee;--bg-sidebar: #ffffff;--bg-header: #ffffff;--bg-input: #f4f4f5;--bg-hover: #f4f4f5;--bg-message-out: #effdde;--bg-message-in: #ffffff;--tail-message-out: #effdde;--tail-message-in: #ffffff;--text-primary: #000000;--text-secondary: #707579;--text-inverse: #ffffff;--text-link: #3390ec;--text-message-time: #5db050;--text-message-time-in: #a3adb6;--border-color: #e0e0e0;--border-light: #f0f0f0;--accent: #3390ec;--accent-hover: #2b7fd4;--accent-light: rgba(51, 144, 236, .08);--danger: #e53935;--danger-hover: #c62828;--online: #0ac630;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .08);--shadow-md: 0 2px 8px rgba(0, 0, 0, .08);--shadow-lg: 0 4px 24px rgba(0, 0, 0, .12);--shadow-header: 0 1px 2px rgba(0, 0, 0, .06);--search-bg: #f4f4f5;--chat-pattern: none;--header-icon: #707579;--unread-badge: #3390ec}[data-theme=dark]{--bg-primary: #212121;--bg-secondary: #181818;--bg-chat: #0e0e0e;--bg-sidebar: #212121;--bg-header: #212121;--bg-input: #2c2c2c;--bg-hover: #2c2c2c;--bg-message-out: #8774e1;--bg-message-in: #212121;--tail-message-out: #8774e1;--tail-message-in: #212121;--text-primary: #f9f8fd;--text-secondary: #aaaaaa;--text-inverse: #ffffff;--text-link: #f9f8fd;--text-message-time: rgba(255, 255, 255, .5);--text-message-time-in: rgba(255, 255, 255, .45);--border-color: #303030;--border-light: #2a2a2a;--accent: #8774e1;--accent-hover: #7b68d8;--accent-light: rgba(135, 116, 225, .12);--danger: #e53935;--danger-hover: #ff5252;--online: #0ac630;--shadow-sm: none;--shadow-md: none;--shadow-lg: 0 4px 24px rgba(0, 0, 0, .4);--shadow-header: none;--search-bg: #2c2c2c;--chat-pattern: none;--header-icon: #aaaaaa;--unread-badge: #8774e1}*{margin:0;padding:0;box-sizing:border-box}html,body{height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,"Apple Color Emoji","Segoe UI Emoji",Helvetica,Arial,sans-serif;font-size:14px;color:var(--text-primary);background-color:var(--bg-secondary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow:hidden;overscroll-behavior:none;-webkit-overflow-scrolling:touch}#app{height:100%}a{color:var(--text-link);text-decoration:none}a:hover{text-decoration:underline}input,textarea,button{font-family:inherit;font-size:inherit}button{cursor:pointer;border:none;outline:none;background:none}input{outline:none;border:none}::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#00000026;border-radius:10px}[data-theme=dark] ::-webkit-scrollbar-thumb{background:#ffffff1a}::-webkit-scrollbar-thumb:hover{background:#00000040}[data-theme=dark] ::-webkit-scrollbar-thumb:hover{background:#fff3}.apple-emoji{height:1.2em;width:1.2em;vertical-align:-.2em;display:inline;object-fit:contain}.auth-container{display:flex;justify-content:center;align-items:center;min-height:100vh;min-height:100dvh;padding:20px;padding-top:max(20px,env(safe-area-inset-top));padding-bottom:max(20px,env(safe-area-inset-bottom));background-color:var(--bg-secondary);overflow-y:auto}.auth-card{background:var(--bg-primary);border-radius:16px;padding:40px;width:100%;max-width:380px;box-shadow:var(--shadow-lg)}.auth-logo{display:flex;justify-content:center;margin-bottom:16px}.auth-logo svg{width:56px;height:56px}.auth-card h1{font-size:24px;font-weight:600;margin-bottom:4px;color:var(--text-primary);text-align:center}.auth-card p.subtitle{color:var(--text-secondary);margin-bottom:28px;font-size:14px;text-align:center}.form-group{margin-bottom:16px}.form-group label{display:block;margin-bottom:6px;font-size:12px;font-weight:500;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px}.form-group input{width:100%;padding:12px 14px;border:2px solid var(--border-color);border-radius:10px;background:var(--bg-primary);color:var(--text-primary);font-size:16px;transition:border-color .15s}.form-group input:focus{border-color:var(--accent)}.form-group input::placeholder{color:var(--text-secondary);opacity:.6}.field-hint{display:block;margin-top:4px;font-size:12px;color:var(--text-secondary);opacity:.8}.btn-primary{width:100%;padding:12px;background:var(--accent);color:#fff;border-radius:10px;font-size:15px;font-weight:500;transition:background .15s,transform .1s,opacity .15s;border:none;cursor:pointer;margin-top:4px}.btn-gradient{background:linear-gradient(135deg,var(--accent),var(--accent-hover))}.btn-primary:hover{background:var(--accent-hover)}.btn-gradient:hover{background:linear-gradient(135deg,var(--accent-hover),var(--accent))}.btn-primary:active{transform:scale(.98)}.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}.error-message{background:#e5393514;color:var(--danger);padding:10px 14px;border-radius:10px;margin-bottom:16px;font-size:13px}.auth-footer{text-align:center;margin-top:20px;color:var(--text-secondary);font-size:14px}.auth-footer a{color:var(--accent);font-weight:500}.auth-bottom-controls{position:fixed;top:16px;right:16px;display:flex;align-items:center;gap:4px}.password-rules{margin-top:10px;display:flex;flex-direction:column;gap:4px}.rule-item{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text-secondary);transition:color .2s}.rule-dot{width:6px;height:6px;border-radius:50%;background:var(--danger);flex-shrink:0;transition:background .2s}.rule-item.passed{color:var(--online)}.rule-item.passed .rule-dot{background:var(--online)}.strength-bar{margin-top:8px;height:4px;background:var(--border-color);border-radius:2px;overflow:hidden}.strength-segment{height:100%;border-radius:2px;transition:width .3s ease,background-color .3s ease}.strength-weak{background-color:var(--danger)}.strength-medium{background-color:#f59e0b}.strength-strong{background-color:var(--online)}.password-match-hint{margin-top:6px}.username-modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;display:flex;justify-content:center;align-items:center;background:#00000080;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);padding:20px;padding-top:max(20px,env(safe-area-inset-top));padding-bottom:max(20px,env(safe-area-inset-bottom))}.username-modal-card{background:var(--bg-primary);border-radius:16px;padding:36px;width:100%;max-width:380px;box-shadow:var(--shadow-lg);text-align:center}.username-modal-icon{display:flex;justify-content:center;margin-bottom:16px}.username-modal-icon svg{width:56px;height:56px}.username-modal-card h2{font-size:20px;font-weight:600;color:var(--text-primary);margin-bottom:4px}.username-modal-sub{color:var(--text-secondary);font-size:14px;margin-bottom:24px}.username-modal-card .form-group{text-align:left}.setup-avatar-section{display:flex;flex-direction:column;align-items:center;margin-bottom:20px}.setup-avatar{width:80px;height:80px;border-radius:50%;background:var(--bg-hover);border:2px dashed var(--border-color);display:flex;align-items:center;justify-content:center;color:var(--text-secondary);cursor:pointer;position:relative;overflow:hidden;transition:border-color .15s}.setup-avatar:hover{border-color:var(--accent)}.setup-avatar img{width:100%;height:100%;object-fit:cover;border-radius:50%}.setup-avatar-hover{position:absolute;top:0;right:0;bottom:0;left:0;background:#00000059;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .15s}.setup-avatar:hover .setup-avatar-hover{opacity:1}.setup-avatar-label{font-size:12px;color:var(--text-secondary);margin-top:6px}.username-input-wrap{display:flex;align-items:center;border:2px solid var(--border-color);border-radius:10px;background:var(--bg-primary);transition:border-color .15s;overflow:hidden}.username-input-wrap:focus-within{border-color:var(--accent)}.username-prefix{padding:12px 0 12px 14px;color:var(--text-secondary);font-size:16px;font-weight:500;-webkit-user-select:none;user-select:none}.username-input-wrap input{flex:1;padding:12px 14px 12px 4px;border:none!important;background:transparent;color:var(--text-primary);font-size:16px}.username-input-wrap input:focus{border:none!important}.username-status{margin-top:8px;font-size:12px;text-align:left}.status-invalid{color:var(--text-secondary)}.status-checking{color:var(--text-secondary);display:inline-flex;align-items:center;gap:6px}.status-available{color:var(--online)}.status-available:before,.status-taken:before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;margin-right:5px;vertical-align:middle}.status-available:before{background:var(--online)}.status-taken:before{background:var(--danger)}.status-taken{color:var(--danger)}.spinner-small{display:inline-block;width:12px;height:12px;border:2px solid var(--border-color);border-top-color:var(--accent);border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.chat-layout{display:flex;height:100vh;height:100dvh;background:var(--bg-secondary)}.chat-layout .sidebar{width:420px;min-width:300px;border-right:1px solid var(--border-color);display:flex;flex-direction:column;background:var(--bg-sidebar)}.chat-layout .main-area{flex:1;display:flex;flex-direction:column;background:var(--bg-chat)}.header-bar{display:flex;align-items:center;padding:8px 16px;background:var(--bg-header);min-height:56px;border-bottom:1px solid var(--border-light);gap:12px;box-shadow:var(--shadow-header);position:relative;z-index:1}.sidebar .header-bar{justify-content:space-between}.header-bar .username{font-size:15px;font-weight:500;color:var(--text-primary)}.contact-list{flex:1;overflow-y:auto}.avatar{width:54px;height:54px;border-radius:50%;background:linear-gradient(135deg,var(--accent),#6c5ce7);display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px;font-weight:500;flex-shrink:0;text-transform:uppercase;-webkit-user-select:none;user-select:none}.avatar.small{width:42px;height:42px;font-size:17px}@media(max-width:768px){.chat-layout .sidebar{width:100%;min-width:0;border-right:none}.chat-layout .main-area,.chat-layout.mobile-chat-open .sidebar{display:none}.chat-layout.mobile-chat-open .main-area{display:flex;width:100%}.avatar{width:50px;height:50px;font-size:18px}.auth-card{padding:28px 20px}.header-bar{padding-top:max(8px,env(safe-area-inset-top));padding-left:max(12px,env(safe-area-inset-left));padding-right:max(12px,env(safe-area-inset-right))}}