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#ddd;border-radius:4px;font-size:14px;cursor:pointer;margin-top:10px}.btn-secondary:hover{background:#eee}.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}.modal-card{background:#fff;padding:25px;border-radius:12px;width:90%;max-width:420px;box-shadow:0 10px 40px #0003}.modal-card h3{margin-top:0;margin-bottom:20px;color:#333}.app-body{display:flex;flex:1}.sidebar{width:240px;background:#fff;border-right:1px solid #e0e0e0;padding:20px 0}.nav-item{padding:12px 24px;cursor:pointer;display:flex;align-items:center;gap:12px;color:#666;transition:all .2s}.nav-icon{font-size:18px;width:20px;height:20px;flex-shrink:0}.nav-item:hover{background:#f5f5f5}.nav-item.active{background:#fff5e6;color:#ff6b00;border-right:3px solid #ff6b00;font-weight:600}.main-content{flex:1;padding:30px;background:#f5f5f5}.content-tabs{display:flex;gap:10px;margin-bottom:30px;border-bottom:1px solid #e0e0e0}.content-tabs button{padding:10px 20px;background:none;border:none;cursor:pointer;color:#666;border-bottom:2px solid transparent}.content-tabs button.active{color:#ff6b00;border-bottom-color:#ff6b00}.content-area{background:#fff;border-radius:8px;padding:30px;min-height:500px}.overview-section{display:flex;flex-direction:column;gap:30px}.welcome-card{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:40px;border-radius:8px}.welcome-card h2{font-size:32px;margin-bottom:10px}.welcome-card p{font-size:18px;opacity:.9}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px}.stat-card{background:#fff;border:1px solid #e0e0e0;border-radius:8px;padding:24px;text-align:center}.stat-card h3{font-size:36px;color:#ff6b00;margin-bottom:8px}.stat-card p{color:#666;font-size:14px}.page-placeholder{text-align:center;padding:60px 20px;color:#999}.page-placeholder h2{font-size:32px;margin-bottom:10px;color:#333}.page-placeholder 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