:root{color-scheme:light dark;--bg: #10141f;--panel: #1a2030;--soft: #20293d;--text: #e8eeff;--accent: #5d7cff}*{box-sizing:border-box}body{margin:0;font-family:Inter,Arial,sans-serif;background:radial-gradient(circle at top,#1d2742,#0f1320 60%);color:var(--text)}.auth-wrap{min-height:100vh;display:grid;place-items:center}.auth-card{width:min(92vw,360px);background:var(--panel);border:1px solid #2d3650;border-radius:16px;padding:24px;display:grid;gap:10px}input,button{border-radius:10px;border:1px solid #3a4668;padding:10px 12px;background:#111a2b;color:var(--text)}button{background:var(--accent);border:none;cursor:pointer}.link-btn{background:transparent;border:none;color:#a5b5ff}.error{color:#ff9ca8}.layout{display:grid;grid-template-columns:280px 1fr;min-height:100vh}.sidebar{border-right:1px solid #2d3650;background:#141a29e6;padding:10px}.sidebar-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.chat-item{width:100%;text-align:left;margin-bottom:8px;background:var(--soft)}.chat-item.active{outline:1px solid var(--accent)}.chat-panel{display:grid;grid-template-rows:1fr auto}.messages{padding:16px;overflow:auto}.message{background:#1a233a;margin-bottom:8px;border-radius:12px;padding:10px}.typing{font-size:13px;color:#9db4ff}.composer{display:grid;grid-template-columns:1fr auto;gap:8px;border-top:1px solid #2d3650;padding:10px}@media(max-width:900px){.layout{grid-template-columns:1fr}.sidebar{display:none}}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.modal{background:var(--panel);border:1px solid #2d3650;border-radius:16px;width:100%;max-width:500px;max-height:80vh;overflow:hidden;display:flex;flex-direction:column}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:20px;border-bottom:1px solid #2d3650}.modal-header h2{margin:0;font-size:20px}.close-btn{background:transparent;border:none;font-size:28px;color:var(--text);cursor:pointer;padding:0;width:32px;height:32px;line-height:1}.create-chat-content{padding:20px;display:flex;flex-direction:column;gap:16px}.selected-users{border:1px solid #2d3650;border-radius:10px;padding:12px;min-height:60px}.no-selection,.no-users{display:flex;justify-content:center;align-items:center;padding:20px;color:#a5b5ff}.add-user-btn,.add-more-btn{background:var(--soft);border:1px dashed #3a4668;color:var(--accent);padding:10px 20px;border-radius:8px;cursor:pointer}.selected-list{display:flex;flex-wrap:wrap;gap:8px}.selected-user{display:flex;align-items:center;gap:8px;background:var(--soft);padding:6px 12px;border-radius:20px;font-size:14px}.remove-btn{background:transparent;border:none;color:#ff9ca8;cursor:pointer;font-size:18px;padding:0;width:20px;height:20px}.form-group{display:flex;flex-direction:column;gap:6px}.form-group label{font-size:14px;color:#a5b5ff}.form-group input{width:100%}.modal-actions{display:flex;gap:12px;justify-content:flex-end}.cancel-btn{background:var(--soft);border:1px solid #3a4668}.create-btn{background:var(--accent);border:none}.create-btn:disabled{opacity:.5;cursor:not-allowed}.search-input{width:100%;padding:12px;border-radius:10px;border:1px solid #3a4668;background:#111a2b;color:var(--text);margin-bottom:10px}.users-list{max-height:300px;overflow-y:auto;display:flex;flex-direction:column;gap:8px}.user-item{display:flex;align-items:center;gap:12px;background:var(--soft);padding:12px;border-radius:10px;text-align:left;position:relative}.user-avatar{width:40px;height:40px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:700;color:#fff;flex-shrink:0}.user-info{flex:1;min-width:0}.user-name{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-username{font-size:13px;color:#a5b5ff}.online-indicator{width:10px;height:10px;background:#4caf50;border-radius:50%;position:absolute;right:12px;top:50%;transform:translateY(-50%)}.loading{text-align:center;padding:40px;color:#a5b5ff}.sidebar-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:15px;padding-bottom:15px;border-bottom:1px solid #2d3650}.sidebar-header h2{margin:0 0 4px}.sidebar-header small{color:#a5b5ff}.sidebar-actions{display:flex;flex-direction:column;gap:8px}.create-chat-btn{background:var(--accent);border:none;padding:8px 16px;border-radius:8px;font-weight:600}.logout-btn{background:transparent;border:1px solid #3a4668;color:#a5b5ff;padding:8px 16px;border-radius:8px}.chats-list{display:flex;flex-direction:column;gap:8px;padding:0 5px}.chat-item{display:flex;flex-direction:column;align-items:flex-start;gap:4px;padding:12px}.chat-title{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;width:100%}.chat-meta{display:flex;gap:8px;font-size:12px}.chat-type{background:var(--soft);padding:2px 8px;border-radius:10px;text-transform:capitalize}.no-chats{text-align:center;padding:40px 20px;color:#a5b5ff}.no-chats p{margin-bottom:16px}.no-chats button{background:var(--accent);border:none;padding:10px 20px;border-radius:8px;font-weight:600}.no-chat-selected{display:flex;align-items:center;justify-content:center;height:100%;color:#a5b5ff}.no-messages{text-align:center;padding:40px;color:#a5b5ff}.message{position:relative}.message-time{display:block;font-size:11px;color:#6b7c9f;margin-top:4px}.composer button:disabled{opacity:.5;cursor:not-allowed}