*{box-sizing:border-box;margin:0;padding:0}:root{--primary: #4267b2;--primary-dark: #365899;--success: #42b72a;--danger: #dc3545;--warning: #ffc107;--bg: #f5f6f7;--white: #ffffff;--text: #1c1e21;--text-secondary: #606770;--border: #dadde1;--shadow: rgba(0, 0, 0, .1)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;min-height:100vh}#root{min-height:100vh}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2);padding:20px}.auth-container{background:var(--white);border-radius:12px;box-shadow:0 10px 40px #0003;padding:40px;width:100%;max-width:400px}.auth-header{text-align:center;margin-bottom:30px}.auth-header h1{font-size:28px;color:var(--text);margin-bottom:8px}.auth-header p{color:var(--text-secondary)}.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;font-weight:600;color:var(--text)}.form-group input{width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:8px;font-size:16px;transition:border-color .2s,box-shadow .2s}.form-group input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #4267b233}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border:none;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .2s}.btn-primary{background:var(--primary);color:var(--white)}.btn-primary:hover{background:var(--primary-dark)}.btn-block{width:100%}.btn-danger{background:var(--danger);color:var(--white)}.btn-danger:hover{background:#c82333}.btn-secondary{background:var(--bg);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:var(--border)}.error-message{background:#ffebe8;border:1px solid #dd3c10;color:#dd3c10;padding:12px 16px;border-radius:8px;margin-bottom:20px;font-size:14px}.layout{min-height:100vh;display:flex;flex-direction:column}.navbar{background:var(--white);border-bottom:1px solid var(--border);padding:0 24px;height:60px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}.navbar-brand{font-size:20px;font-weight:700;color:var(--primary);text-decoration:none}.navbar-nav{display:flex;align-items:center;gap:16px}.nav-link{color:var(--text-secondary);text-decoration:none;font-size:14px;padding:8px 12px;border-radius:6px;transition:all .2s}.nav-link:hover{background:var(--bg);color:var(--text)}.nav-link.active{background:var(--primary);color:var(--white)}.user-info{display:flex;align-items:center;gap:12px}.user-info span{font-size:14px;color:var(--text)}.main-content{flex:1;padding:24px;max-width:1200px;margin:0 auto;width:100%}.chat-list-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.chat-list-header h1{font-size:24px}.chat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}.chat-card{background:var(--white);border-radius:12px;padding:20px;box-shadow:0 2px 8px var(--shadow);cursor:pointer;transition:all .2s;text-decoration:none;color:inherit}.chat-card:hover{transform:translateY(-2px);box-shadow:0 4px 16px var(--shadow)}.chat-card h3{font-size:18px;margin-bottom:8px;color:var(--text)}.chat-card-meta{display:flex;flex-direction:column;gap:4px;color:var(--text-secondary);font-size:14px}.chat-card-stat{display:flex;align-items:center;gap:8px}.empty-state{text-align:center;padding:60px 20px;color:var(--text-secondary)}.empty-state h2{margin-bottom:12px;color:var(--text)}.chat-viewer{background:var(--white);border-radius:12px;box-shadow:0 2px 8px var(--shadow);overflow:hidden}.chat-header{padding:20px 24px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}.chat-header h1{font-size:20px}.back-link{display:flex;align-items:center;gap:8px;color:var(--primary);text-decoration:none;font-size:14px}.back-link:hover{text-decoration:underline}.date-filter{padding:16px 24px;background:var(--bg);display:flex;gap:16px;align-items:flex-end;flex-wrap:wrap}.filter-group{display:flex;flex-direction:column;gap:4px}.filter-group label{font-size:12px;font-weight:600;color:var(--text-secondary)}.filter-group input{padding:8px 12px;border:1px solid var(--border);border-radius:6px;font-size:14px}.filter-actions{display:flex;gap:8px}.quick-filters{display:flex;gap:8px;flex-wrap:wrap}.quick-filter-btn{padding:6px 12px;background:var(--white);border:1px solid var(--border);border-radius:16px;font-size:12px;cursor:pointer;transition:all .2s}.quick-filter-btn:hover,.quick-filter-btn.active{background:var(--primary);color:var(--white);border-color:var(--primary)}.messages-list{padding:24px;max-height:calc(100vh - 300px);overflow-y:auto}.message-item{margin-bottom:20px;padding-bottom:20px;border-bottom:1px solid var(--border)}.message-item:last-child{border-bottom:none}.message-sender{font-weight:600;color:var(--primary);margin-bottom:4px}.message-content{margin-bottom:8px;line-height:1.6}.message-meta{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--text-secondary)}.message-type-badge{padding:2px 8px;background:var(--bg);border-radius:12px}.no-messages{text-align:center;padding:40px;color:var(--text-secondary)}.admin-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.admin-header h1{font-size:24px}.users-table{background:var(--white);border-radius:12px;box-shadow:0 2px 8px var(--shadow);overflow:hidden}.users-table table{width:100%;border-collapse:collapse}.users-table th,.users-table td{padding:16px;text-align:left;border-bottom:1px solid var(--border)}.users-table th{background:var(--bg);font-weight:600;font-size:14px}.users-table tr:last-child td{border-bottom:none}.users-table tr:hover td{background:var(--bg)}.role-badge{display:inline-block;padding:4px 12px;border-radius:16px;font-size:12px;font-weight:600}.role-badge.admin{background:#e7f3ff;color:#06c}.role-badge.user{background:var(--bg);color:var(--text-secondary)}.status-badge{display:inline-block;padding:4px 12px;border-radius:16px;font-size:12px;font-weight:600}.status-badge.active{background:#d4edda;color:#155724}.status-badge.inactive{background:#f8d7da;color:#721c24}.action-btns{display:flex;gap:8px}.btn-sm{padding:6px 12px;font-size:12px}.create-user-modal{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.modal-content{background:var(--white);border-radius:12px;padding:30px;width:100%;max-width:400px}.modal-content h2{margin-bottom:20px}.modal-actions{display:flex;gap:12px;margin-top:20px}.modal-actions .btn{flex:1}.loading{display:flex;align-items:center;justify-content:center;padding:40px;color:var(--text-secondary)}.spinner{width:40px;height:40px;border:4px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width: 768px){.chat-grid{grid-template-columns:1fr}.date-filter{flex-direction:column;align-items:stretch}.filter-actions{width:100%}.filter-actions .btn{flex:1}}