*{margin:0;padding:0;box-sizing:border-box}body{margin:0;font-family:Segoe UI,Arial,sans-serif;background-color:#fff;color:#333;min-height:100vh}#root{min-height:100vh}#root{width:100%;margin:0;padding:0}.lobby-container{display:flex;width:100%;min-height:100vh;background-color:#fff}.sidebar{width:280px;background-color:#1a1a1a;color:#fff;padding:2rem 1.5rem;display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;box-shadow:4px 0 20px #0003}.sidebar-header{margin-bottom:3rem}.sidebar-header h2{font-size:1.5rem;font-weight:600;color:#fff;letter-spacing:.5px}.sidebar-nav{display:flex;flex-direction:column;gap:.8rem}.menu-item{display:flex;align-items:center;gap:1rem;padding:1rem 1.5rem;border-radius:12px;cursor:pointer;transition:all .3s ease;color:#ccc;text-decoration:none;font-weight:500;background:transparent;border:1px solid transparent}.menu-item:hover{background-color:#333;color:#fff;border-color:#404040}.menu-item.active{background-color:#000;color:#fff;border-left:4px solid #ffffff;border-radius:12px 8px 8px 12px}.menu-icon{font-size:1.3rem;color:#999}.menu-item:hover .menu-icon,.menu-item.active .menu-icon{color:#fff}.main-content{flex:1;margin-left:280px;min-height:100vh;display:flex;flex-direction:column;background-color:#f5f5f5}.content-header{display:flex;justify-content:flex-end;align-items:center;padding:1.5rem 3rem;background-color:#fff;border-bottom:1px solid #eaeaea;position:sticky;top:0;z-index:10}.user-profile{display:flex;align-items:center;gap:1rem;background-color:#f8f8f8;padding:.5rem 1.5rem .5rem 1rem;border-radius:40px;border:1px solid #eaeaea}.greeting .hello{font-size:1rem;font-weight:500;color:#333}.avatar-container{width:45px;height:45px;border-radius:12px;overflow:hidden;cursor:pointer;transition:all .3s ease;border:2px solid #ffffff;box-shadow:0 2px 8px #0000001a;background-color:#f0f0f0}.avatar-container:hover{transform:scale(1.05);border-radius:50%;border-color:#000}.avatar-image{width:100%;height:100%;object-fit:cover}.content-area{padding:2.5rem;flex:1}.form-container{max-width:600px;margin:2rem auto;background-color:#ffffffd9;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:24px;padding:2.5rem;box-shadow:0 20px 40px #00000014;border:1px solid rgba(255,255,255,.3)}.form-title{font-size:2rem;font-weight:600;color:#000;margin-bottom:.5rem}.form-subtitle{color:#666;margin-bottom:2rem;font-size:1rem}.form-group{margin-bottom:1.8rem}.form-group label{display:block;margin-bottom:.6rem;color:#333;font-weight:500;font-size:.95rem}.form-group input,.form-group select,.form-group textarea{width:100%;padding:1rem 1.2rem;border:1px solid #e0e0e0;border-radius:16px;font-size:1rem;transition:all .3s ease;background-color:#ffffffe6;color:#333}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{outline:none;border-color:#000;box-shadow:0 0 0 3px #0000000d;background-color:#fff}.form-group input::placeholder{color:#999}.btn-primary{background-color:#000;color:#fff;border:none;padding:1.2rem 2rem;border-radius:16px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;width:100%;margin-top:1.5rem;letter-spacing:.5px}.btn-primary:hover{background-color:#333;transform:translateY(-2px);box-shadow:0 10px 25px #00000026}.divider{height:1px;background:linear-gradient(to right,transparent,#dddddd,transparent);margin:2rem 0}.badge{background-color:#f5f5f5;color:#666;padding:.5rem 1.2rem;border-radius:40px;font-size:.85rem;display:inline-block;border:1px solid #eaeaea}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.5rem;margin-top:2rem}.stat-card{background-color:#fff;border-radius:20px;padding:1.8rem;box-shadow:0 5px 20px #00000005;border:1px solid #f0f0f0;transition:all .3s ease}.stat-card:hover{border-color:#ddd;box-shadow:0 8px 25px #0000000d}.stat-card h4{color:#888;font-size:.9rem;font-weight:500;margin-bottom:.5rem}.stat-card .stat-number{color:#000;font-size:2rem;font-weight:600}.courses-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem;margin-top:2rem}.course-card{background-color:#fff;border-radius:20px;padding:1.5rem;border:1px solid #f0f0f0;transition:all .3s ease}.course-card:hover{border-color:#ccc;transform:translateY(-3px);box-shadow:0 10px 30px #0000000d}.course-card h3{color:#000;font-size:1.2rem;margin-bottom:.5rem}.course-card .instructor{color:#666;font-size:.9rem;margin-bottom:1rem}.course-card .rating{color:#333;font-size:.9rem;margin-bottom:.5rem}.course-card .duration{color:#888;font-size:.9rem}@media(max-width:768px){.sidebar{width:100%;position:relative;height:auto}.main-content{margin-left:0}.content-header,.content-area{padding:1rem}.form-container{padding:1.5rem;margin:1rem}}