:root{--bg:#f4f2ff;--surface:#fff;--surface-soft:#efeaff;--surface-muted:#f8f5ff;--surface-hover:#f7f3ff;--input-bg:#fff;--ink:#14161e;--ink-soft:#4f5160;--lav:#b9b7ff;--lav-strong:#8a79ff;--lav-text:#4a47a3;--danger:#ff6a6a;--gradient-auth:linear-gradient(145deg, #e4ddff 0%, #cabdff 45%, #b4a4ff 100%);--gradient-chat:linear-gradient(145deg, #e8e1ff 0%, #f4f2ff 35%, #ebe7ff 100%);--gradient-messages:linear-gradient(160deg, #fdfcff 0%, #f6f2ff 100%);--shadow-color:#000;--r:4px;--shadow:4px 4px 0 var(--shadow-color);--ring:0 0 0 3px #b9b7ff8c}[data-theme=dark]{--bg:#151722;--surface:#1d2030;--surface-soft:#2c3150;--surface-muted:#252a40;--surface-hover:#33395b;--input-bg:#181c2d;--ink:#f4f6ff;--ink-soft:#b3b8d1;--lav:#7d72f7;--lav-strong:#998fff;--lav-text:#cac2ff;--danger:#ff7b9a;--gradient-auth:linear-gradient(145deg, #242845 0%, #2f3458 45%, #3a4173 100%);--gradient-chat:linear-gradient(145deg, #161a2a 0%, #1e2238 35%, #262d4c 100%);--gradient-messages:linear-gradient(160deg, #1b1f32 0%, #232844 100%);--shadow-color:#000;--shadow:4px 4px 0 var(--shadow-color);--ring:0 0 0 3px #998fff73}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}button,input,textarea{font:inherit}#root{width:100%;min-height:100vh}.route-loading{background:var(--gradient-auth);min-height:100vh;color:var(--ink);place-items:center;font-size:1.05rem;font-weight:700;display:grid}.theme-toggle{z-index:2000;border:2px solid var(--ink);border-radius:var(--r);box-shadow:var(--shadow);background:var(--surface);color:var(--ink);cursor:pointer;padding:8px 12px;font-weight:700;transition:transform .2s,box-shadow .2s,background .2s;position:fixed;top:14px;right:14px}.theme-toggle:hover{box-shadow:6px 6px 0 var(--shadow-color);background:var(--surface-soft);transform:translate(-2px,-2px)}.auth-container{background:var(--gradient-auth);justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.auth-card{background:var(--surface);border-radius:var(--r);width:100%;max-width:400px;box-shadow:var(--shadow);border:2px solid var(--ink);padding:40px}.auth-card h1{text-align:center;color:var(--lav-text);margin-bottom:8px;font-size:2.5rem}.auth-card h2{text-align:center;color:var(--ink);margin-bottom:32px;font-size:1.5rem;font-weight:500}.form-group{margin-bottom:20px}.form-group label{color:var(--ink-soft);margin-bottom:8px;font-weight:500;display:block}.form-group input{width:100%;box-shadow:var(--shadow);border:2px solid var(--ink);border-radius:var(--r);background:var(--input-bg);color:var(--ink);box-sizing:border-box;padding:14px 16px;font-size:1rem;transition:transform .2s,box-shadow .2s}.form-group input:focus{box-shadow:5px 5px 0 var(--ink), var(--ring);outline:none;transform:translate(-1px,-1px)}.form-group input::placeholder{color:var(--ink-soft)}.error-message{color:#8c1f1f;box-shadow:var(--shadow);border-radius:var(--r);background:#ffe7e7;border:2px solid #8c1f1f;margin-bottom:20px;padding:12px 16px;font-size:.9rem}.auth-button{border:2px solid var(--ink);border-radius:var(--r);background:var(--lav);cursor:pointer;width:100%;color:var(--ink);box-shadow:var(--shadow);padding:14px;font-size:1rem;font-weight:600;text-decoration:none;transition:transform .2s,box-shadow .2s}.auth-button:hover:not(:disabled){box-shadow:6px 6px 0 var(--ink);transform:translate(-2px,-2px)}.auth-button:disabled{opacity:.7;cursor:not-allowed;transform:none}.auth-switch{text-align:center;color:var(--ink-soft);margin-top:24px}.auth-switch a{color:var(--lav-text);font-weight:600;text-decoration:none}.auth-switch a:hover{text-decoration:underline}.chat-container{background:var(--gradient-chat);gap:14px;height:100dvh;padding:14px;display:flex;overflow:hidden}.sidebar,.chat-main,.members-sidebar{background:var(--surface);border:2px solid var(--ink);border-radius:var(--r);box-shadow:var(--shadow)}.sidebar{flex-direction:column;width:300px;min-height:0;display:flex;overflow:hidden}.sidebar-header{border-bottom:2px solid var(--ink);justify-content:space-between;align-items:center;gap:10px;padding:18px;display:flex}.sidebar-header h2{color:var(--lav-text);margin:0;font-size:1.4rem}.logout-btn,.tab,.create-group-btn,.message-form button,.modal-actions button,.add-member-btn,.delete-group-btn,.remove-member-btn{border:2px solid var(--ink);border-radius:var(--r);box-shadow:var(--shadow);cursor:pointer;color:var(--ink);transition:transform .2s,box-shadow .2s,background .2s}.logout-btn:hover,.tab:hover,.create-group-btn:hover,.message-form button:hover,.modal-actions button:hover,.add-member-btn:hover,.delete-group-btn:hover,.remove-member-btn:hover{box-shadow:6px 6px 0 var(--shadow-color);transform:translate(-2px,-2px)}.logout-btn{background:var(--danger);padding:8px 14px;font-size:.85rem;font-weight:600}.tabs{border-bottom:2px solid var(--ink);background:var(--surface-muted);gap:8px;padding:12px;display:flex}.tab{background:var(--surface);color:var(--ink-soft);flex:1;padding:10px;font-weight:600}.tab.active{background:var(--lav);color:var(--ink)}.chat-list{flex:1;min-height:0;padding:12px;overflow-y:auto}.chat-item{border:2px solid var(--ink);box-shadow:var(--shadow);border-radius:var(--r);cursor:pointer;background:var(--surface);align-items:center;margin-bottom:10px;padding:12px;transition:transform .2s,box-shadow .2s,background .2s;display:flex}.chat-item:hover{box-shadow:6px 6px 0 var(--shadow-color);background:var(--surface-hover);transform:translate(-2px,-2px)}.chat-item.active{background:var(--surface-soft)}.avatar,.user-avatar,.member-avatar{border:2px solid var(--ink);color:#fff;background:linear-gradient(145deg,#9283ff 0%,#6e59e9 100%);border-radius:50%;justify-content:center;align-items:center;font-weight:700;display:flex;position:relative}.avatar{width:44px;height:44px;margin-right:12px;font-size:1.05rem}.presence-dot{border:2px solid var(--surface);border-radius:50%;width:12px;height:12px;position:absolute;bottom:1px;right:1px}.presence-dot.online{background:#33bf61}.presence-dot.offline{background:#ff6a6a}.group-avatar{background:linear-gradient(145deg,#aa8dff 0%,#7a52f3 100%)}.chat-info{flex:1;min-width:0}.chat-name{color:var(--ink);margin-bottom:3px;font-weight:700}.last-message{color:var(--ink-soft);white-space:nowrap;text-overflow:ellipsis;font-size:.83rem;overflow:hidden}.create-group-btn{color:#14161e;background:#ece5ff;width:100%;margin-bottom:12px;padding:11px;font-size:.9rem;font-weight:600}.user-info{border-top:2px solid var(--ink);background:var(--surface-muted);align-items:center;padding:14px 16px;display:flex}.user-avatar{width:36px;height:36px;margin-right:10px;font-size:.9rem}.user-name{color:var(--ink);font-weight:600}.chat-main{flex-direction:column;flex:1;min-height:0;display:flex;overflow:hidden}.chat-header{border-bottom:2px solid var(--ink);background:var(--surface-muted);justify-content:space-between;align-items:center;gap:12px;padding:18px 20px;display:flex}.chat-title{color:var(--lav-text);font-size:1.2rem;font-weight:700}.messages-container{background:var(--gradient-messages);flex-direction:column;flex:1;gap:12px;min-height:0;padding:18px;display:flex;overflow-y:auto}.message{border:2px solid var(--ink);box-shadow:var(--shadow);border-radius:var(--r);background:var(--surface);word-wrap:break-word;overflow-wrap:break-word;align-self:flex-start;max-width:min(75%,620px);padding:11px 14px}.message.own{background:var(--lav);align-self:flex-end}.message-content{word-wrap:break-word}.message-time{opacity:.75;margin-top:4px;font-size:.74rem}.message-form{border-top:2px solid var(--ink);background:var(--surface-muted);gap:10px;padding:14px 18px;display:flex}.message-form input,.modal input{border:2px solid var(--ink);border-radius:var(--r);box-shadow:var(--shadow);background:var(--input-bg);color:var(--ink);outline:none}.message-form input{flex:1;padding:12px 16px}.message-form input:focus,.modal input:focus{box-shadow:5px 5px 0 var(--ink), var(--ring);transform:translate(-1px,-1px)}.message-form button{background:var(--lav);padding:12px 20px;font-weight:700}.no-chat-selected,.no-messages{color:var(--ink-soft);text-align:center;padding:40px}.no-chat-selected{flex-direction:column;flex:1;justify-content:center;align-items:center;display:flex}.no-chat-selected h3{color:var(--lav-text);margin-bottom:8px;font-size:1.45rem}.modal-overlay{z-index:1000;background:#1913296b;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.modal{background:var(--surface);border:2px solid var(--ink);box-shadow:8px 8px 0 var(--ink);border-radius:var(--r);width:min(100%,420px);padding:22px}.modal h3{color:var(--lav-text);margin:0 0 16px}.modal input{width:100%;margin-bottom:14px;padding:11px 14px}.modal-actions{justify-content:flex-end;gap:10px;display:flex}.modal-actions button:first-child{background:var(--surface)}.modal-actions button:last-child,.add-member-btn{background:var(--lav)}.modal-actions button,.add-member-btn,.delete-group-btn{padding:8px 14px;font-size:.86rem;font-weight:600}.group-actions{gap:8px;display:flex}.delete-group-btn,.remove-member-btn{background:var(--danger)}.remove-member-btn{justify-content:center;align-items:center;width:24px;height:24px;margin-left:auto;padding:0;font-size:1rem;line-height:1;display:flex}.admin-tag{background:var(--lav);border:1px solid var(--ink);border-radius:var(--r);color:var(--ink);margin-left:8px;padding:1px 7px;font-size:.68rem;font-weight:700;display:inline-block}.members-sidebar{flex-direction:column;width:240px;min-height:0;display:flex;overflow:hidden}.members-header{border-bottom:2px solid var(--ink);background:var(--surface-muted);padding:18px}.members-header h3{color:var(--lav-text);margin:0;font-size:1rem}.members-list{flex:1;min-height:0;padding:12px;overflow-y:auto}.member-item{border:2px solid var(--ink);box-shadow:var(--shadow);border-radius:var(--r);background:var(--surface);align-items:center;gap:8px;margin-bottom:10px;padding:10px;display:flex}.member-avatar{width:32px;height:32px;margin-right:2px;font-size:.85rem}.member-name{color:var(--ink);font-size:.88rem;font-weight:600}.message-sender{color:var(--lav-text);margin-bottom:4px;font-size:.75rem;font-weight:700}.search-results{border:2px solid var(--ink);border-radius:var(--r);max-height:200px;box-shadow:var(--shadow);margin-bottom:14px;overflow-y:auto}.search-result{cursor:pointer;border-bottom:2px solid var(--ink);background:var(--surface);padding:10px 12px}.search-result:last-child{border-bottom:none}.search-result:hover,.search-result.selected{background:var(--surface-soft)}.result-name{color:var(--ink);font-weight:700}.result-email{color:var(--ink-soft);font-size:.82rem}@media (width<=1100px){.members-sidebar{display:none}}@media (width<=900px){.chat-container{flex-direction:column}.sidebar{width:100%;max-height:45vh}}