:root{--primary-color:#4a6fa5;--primary-dark:#2a4a7f;--primary-light:#3a5a8f;--success-color:#28a745;--danger-color:#dc3545;--warning-color:#ffc107;--info-color:#17a2b8;--light-gray:#f5f5f5;--dark-gray:#333;--bg-color:#000;--text-color:white;--card-bg:white;--card-text:#333}[data-theme=light]{--bg-color:#ffffff;--text-color:#333;--card-bg:#f8f9fa;--card-text:#333}[data-theme=dark]{--bg-color:#000;--text-color:white;--card-bg:#2d2d2d;--card-text:white}*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif}body{background:var(--bg-color);min-height:100vh;padding:0!important;color:var(--text-color);transition:background-color .3s ease,color .3s ease}.container{max-width:1400px;margin:60px auto;background:var(--card-bg);color:var(--card-text);border-radius:20px;box-shadow:0 0 20px rgba(0,0,0,.3);overflow:hidden;transition:background-color .3s ease,color .3s ease}.header-logo{text-align:center;margin-bottom:25px}.header-logo img{max-height:100px;max-width:100%;padding-top:10px}.navigation-header{position:fixed;top:0;left:0;right:0;background:linear-gradient(135deg,#000);color:#fff;display:flex;justify-content:space-between;align-items:center;z-index:1000;box-shadow:0 2px 10px rgba(0,0,0,.1);transition:background-color .3s ease,color .3s ease}[data-theme=light] .navigation-header{background:linear-gradient(135deg,#fff,#f8f9fa);color:#333;box-shadow:0 2px 10px rgba(0,0,0,.1)}[data-theme=dark] .navigation-header{background:linear-gradient(135deg,#2d2d2d,#1a1a1a);color:#fff;box-shadow:0 2px 10px rgba(0,0,0,.3)}.nav-left{display:flex;align-items:center;gap:15px}.nav-left img{height:40px}.nav-right{display:flex;gap:10px}.nav-buttons{display:flex;gap:10px}.nav-buttons button{padding:8px 15px;background-color:var(--primary-color);color:#fff;border:none;border-radius:4px;cursor:pointer;font-weight:600;transition:all .2s ease;display:flex;align-items:center;gap:5px;text-decoration:none}.nav-buttons button:hover{transform:translateY(-1px);background-color:var(--primary-dark)}.nav-buttons button:active{transform:translateY(0)}.nav-buttons button.logout{background-color:#dc3545}.nav-buttons button.logout:hover{background-color:#c82333}.nav-header{position:absolute;top:20px;left:20px}.main-content{padding:0 40px 40px 40px}.dashboard-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;margin-bottom:30px}.card{background:#fff;border-radius:8px;box-shadow:0 2px 10px rgba(0,0,0,.1);padding:20px;transition:transform .3s,box-shadow .3s}.card:hover{transform:translateY(-5px);box-shadow:0 5px 15px rgba(0,0,0,.1)}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px}.card-title{font-size:18px;font-weight:600;color:var(--primary-dark)}.card-icon{font-size:24px;color:var(--primary-color)}.card-value{font-size:28px;font-weight:700;margin-bottom:10px;color:var(--dark-gray)}.card-description{font-size:14px;color:#666}.action-buttons{display:flex;gap:15px;margin-bottom:30px;flex-wrap:wrap}.btn{padding:12px 25px;border:none;border-radius:8px;font-weight:600;cursor:pointer;transition:all .3s;display:inline-flex;align-items:center;gap:8px}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-success{background:var(--success-color);color:#fff}.btn-success:hover{background:#218838}.groups-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(350px,1fr));gap:25px}.group-card{background:#fff;border-radius:12px;box-shadow:0 5px 15px rgba(0,0,0,.08);overflow:hidden;transition:all .3s ease;cursor:pointer}.group-card:hover{transform:translateY(-3px);box-shadow:0 8px 25px rgba(0,0,0,.15)}.group-card:active{transform:scale(.98)}.group-card.selected{border:2px solid var(--primary-color);box-shadow:0 8px 25px rgba(74,111,165,.2)}.group-header{background:linear-gradient(135deg,var(--primary-color) 0,var(--primary-dark) 100%);color:#fff;padding:20px;position:relative}.group-name{font-size:1.3rem;font-weight:700;margin-bottom:5px}.group-code{background:rgba(255,255,255,.2);padding:5px 12px;border-radius:20px;font-size:.9rem;display:inline-block}.group-body{padding:20px}.member-count{font-size:1.1rem;color:var(--primary-color);margin-bottom:15px;font-weight:600}.members-list{max-height:150px;overflow-y:auto;margin-bottom:20px}.member-item{display:flex;align-items:center;padding:8px 0;border-bottom:1px solid #eee}.member-item:last-child{border-bottom:none}.member-avatar{width:32px;height:32px;background:var(--primary-color);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;margin-right:10px}.member-info{flex:1}.member-name{font-weight:600;color:var(--dark-gray)}.member-email{font-size:.9rem;color:#666}.group-actions{display:flex;gap:10px}.btn-sm{padding:8px 15px;font-size:.9rem}.modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);z-index:1000;justify-content:center;align-items:center}.modal-content{background:#fff;border-radius:15px;padding:0;max-width:800px;width:95%;max-height:90vh;overflow:hidden;box-shadow:0 20px 40px rgba(0,0,0,.15);animation:modalSlideIn .3s}.modal-content.large{max-width:1000px}@keyframes modalSlideIn{from{opacity:0;transform:translateY(-50px)}to{opacity:1;transform:translateY(0)}}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:0;padding:25px 30px;border-bottom:2px solid #f0f0f0;background:linear-gradient(135deg,#fff);color:var(--primary-color)}.modal-body{padding:30px;max-height:60vh;overflow-y:auto}.modal-footer{display:flex;justify-content:flex-end;gap:15px;padding:20px 30px;border-top:2px solid #f0f0f0;background:#f8f9fa}.group-details-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.group-name-edit{display:flex;align-items:center;gap:10px}.group-name-display{font-size:1.8rem;font-weight:700;color:var(--primary-color)}.group-name-input{font-size:1.5rem;font-weight:700;border:2px solid var(--primary-color);border-radius:6px;padding:8px 12px;min-width:250px}.group-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:15px;margin-bottom:25px}.stat-item{background:linear-gradient(135deg,var(--primary-color),var(--primary-dark));color:#fff;padding:15px;border-radius:10px;text-align:center}.stat-item .value{font-size:2rem;font-weight:700;margin-bottom:5px}.stat-item .label{font-size:.9rem;opacity:.9}.members-section{margin-bottom:25px}.members-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px}.section-title{font-size:1.3rem;font-weight:700;color:var(--primary-color)}.members-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:15px}.member-card{background:#fff;border:2px solid #f0f0f0;border-radius:10px;padding:15px;transition:all .3s}.member-card:hover{border-color:var(--primary-color);transform:translateY(-2px)}.member-card.admin{border-color:#28a745;background:linear-gradient(135deg,#28a745,#1e7e34);color:#fff}.member-card.user{border-color:var(--primary-color);background:linear-gradient(135deg,var(--primary-color),var(--primary-dark));color:#fff}.member-card.viewer{border-color:gray;background:gray;color:#fff}.member-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.member-avatar-large{width:50px;height:50px;background:rgba(255,255,255,.2);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1.2rem;margin-right:15px}.member-info-large{flex:1}.member-name-large{font-size:1.1rem;font-weight:700;margin-bottom:5px}.member-email-large{font-size:.9rem;opacity:.9}.member-role-badge{padding:4px 8px;border-radius:12px;font-size:.8rem;font-weight:700;text-transform:uppercase;background:rgba(255,255,255,.3);color:#fff}.member-actions{display:flex;gap:8px;margin-top:10px}.btn-xs{padding:4px 8px;font-size:.8rem;border-radius:4px}.search-container{position:relative;margin-bottom:20px}.search-input{width:100%;padding:12px 15px 12px 45px;border:2px solid #e1e5e9;border-radius:25px;font-size:1rem;transition:all .3s}.search-input:focus{outline:0;border-color:var(--primary-color);box-shadow:0 0 0 3px rgba(74,111,165,.1)}.search-icon{position:absolute;left:15px;top:50%;transform:translateY(-50%);color:#666;font-size:1.1rem}.filter-tabs{display:flex;gap:10px;margin-bottom:20px}.filter-tab{padding:8px 16px;border:2px solid #e1e5e9;border-radius:20px;background:#fff;cursor:pointer;transition:all .3s;font-weight:600}.filter-tab.active{background:var(--primary-color);color:#fff;border-color:var(--primary-color)}.filter-tab:hover{border-color:var(--primary-color)}.user-selection-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:15px;max-height:400px;overflow-y:auto;padding:10px;border:2px solid #f0f0f0;border-radius:10px}.user-selection-item{background:#fff;border:2px solid #e1e5e9;border-radius:10px;padding:15px;cursor:pointer;transition:all .3s;display:flex;align-items:center;gap:12px}.user-selection-item:hover{border-color:var(--primary-color);transform:translateY(-1px)}.user-selection-item.selected{border-color:var(--primary-color);background:linear-gradient(135deg,var(--primary-color),var(--primary-dark));color:#fff}.user-checkbox{width:20px;height:20px;border:2px solid #e1e5e9;border-radius:4px;display:flex;align-items:center;justify-content:center;transition:all .3s}.user-selection-item.selected .user-checkbox{background:#fff;border-color:#fff;color:var(--primary-color)}.selection-summary{padding:15px;background:#f8f9fa;border-radius:10px;margin-bottom:20px;border-left:4px solid var(--primary-color)}.mobile-nav-toggle{display:none;background:0 0;border:none;color:var(--primary-color);font-size:24px;cursor:pointer;padding:8px;border-radius:4px;transition:background-color .3s,color .3s}.mobile-nav-toggle:hover{background-color:var(--primary-color);color:#fff}.mobile-nav-menu{display:none;position:fixed;top:60px;right:20px;background:#fff;border-radius:8px;box-shadow:0 8px 25px rgba(0,0,0,.15);min-width:220px;overflow:hidden;z-index:1001;animation:slideDown .3s ease-out;border:1px solid var(--primary-color)}@keyframes slideDown{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.mobile-nav-menu.show{display:block}.mobile-nav-menu button{width:100%;padding:15px 20px;text-align:left;background:0 0;border:none;color:#333;font-size:16px;font-weight:500;border-bottom:1px solid #f0f0f0;transition:all .3s;display:flex;align-items:center;gap:12px}.mobile-nav-menu button:last-child{border-bottom:none}.mobile-nav-menu button:hover{background-color:var(--primary-color);color:#fff}.mobile-nav-menu button.logout{color:#dc3545}.mobile-nav-menu button.logout:hover{background-color:#dc3545;color:#fff}@media (max-width:768px){body{background-color:#fff}.container{margin:10px;border-radius:10px}.navigation-header{background:#fff}.nav-left img{height:35px}.nav-buttons{display:none!important}.mobile-nav-toggle{display:block!important}.main-content{padding:20px}.dashboard-cards{grid-template-columns:1fr}.groups-grid{grid-template-columns:1fr}.members-grid{grid-template-columns:1fr}.user-selection-grid{grid-template-columns:1fr}.modal-content{width:98%;max-height:95vh}.modal-body{padding:20px}}.loading-card{background:#f8f9fa;border:2px dashed #dee2e6;border-radius:10px;padding:40px;text-align:center;color:#6c757d;transition:all .3s ease}.loading-card i{font-size:2rem;margin-bottom:15px;animation:spin 1s linear infinite}.loading-card.pulse{animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%{opacity:.6}50%{opacity:1}100%{opacity:.6}}@keyframes fadeInUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeInUp .5s ease-out}.tooltip{position:relative;cursor:help}.tooltip:hover::after{content:attr(data-tooltip);position:absolute;bottom:100%;left:50%;transform:translateX(-50%);background:#333;color:#fff;padding:5px 10px;border-radius:4px;font-size:.8rem;white-space:nowrap;z-index:1000}.message-banner{position:fixed;top:70px;right:20px;max-width:400px;padding:15px 20px;border-radius:10px;box-shadow:0 10px 30px rgba(0,0,0,.2);z-index:1001;animation:slideInRight .3s ease-out}.message-banner.success{background:var(--success-color);color:#fff}.message-banner.error{background:var(--danger-color);color:#fff}@keyframes slideInRight{from{transform:translateX(100%);opacity:0}to{transform:translateX(0);opacity:1}}.modal-title{font-size:1.5rem;color:var(--primary-color);font-weight:700}.modal-close{font-size:1.5rem;color:#999;cursor:pointer;transition:color .3s}.modal-close:hover{color:var(--danger-color)}.form-group{margin-bottom:20px}.form-label{display:block;margin-bottom:8px;font-weight:600;color:var(--dark-gray)}.form-control{width:100%;padding:12px 15px;border:2px solid #e1e5e9;border-radius:8px;font-size:1rem;transition:border-color .3s}.form-control:focus{outline:0;border-color:var(--primary-color);box-shadow:0 0 0 3px rgba(74,111,165,.1)}.alert{padding:12px 15px;border-radius:8px;margin-bottom:20px;display:none}.alert-success{background:#d4edda;color:#155724;border:1px solid #c3e6cb}.alert-danger{background:#f8d7da;color:#721c24;border:1px solid #f5c6cb}.modal-footer{display:flex;justify-content:flex-end;gap:15px;margin-top:25px}.empty-state{text-align:center;padding:60px 20px;color:#666}.empty-state i{font-size:4rem;margin-bottom:20px;color:#ddd}.empty-state h3{margin-bottom:10px;color:var(--dark-gray)}.loading-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);display:none;justify-content:center;align-items:center;z-index:2000}.loading-spinner{width:50px;height:50px;border:5px solid #f3f3f3;border-top:5px solid var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}@media (max-width:768px){.container{margin:10px;border-radius:10px;padding-top:40px}.header-logo img{max-height:60px}.main-content{padding:20px}.dashboard-cards{grid-template-columns:1fr}.groups-grid{grid-template-columns:1fr}.action-buttons{flex-direction:column}}