header{padding:.5rem 0}@media (max-width:768px){.header-container{padding:0 1rem}nav{flex-direction:column;width:100%;position:absolute;top:100%;left:0;background-color:#343a40;padding:1rem;box-shadow:0 4px 8px rgba(0,0,0,.2);max-height:0;overflow:hidden;transition:max-height .3s ease}nav.active{max-height:300px}.menu-toggle{display:block;cursor:pointer;width:30px;height:30px;position:relative;z-index:101}.menu-toggle span,.menu-toggle span:after,.menu-toggle span:before{content:"";display:block;width:100%;height:3px;background-color:#fff;position:absolute;transition:all .3s ease}.menu-toggle span{top:50%;transform:translateY(-50%)}.menu-toggle span:before{top:-10px}.menu-toggle span:after{top:10px}.menu-toggle.active span{background-color:transparent}.menu-toggle.active span:before{transform:rotate(45deg);top:0}.menu-toggle.active span:after{transform:rotate(-45deg);top:0}nav a{margin:0;padding:.75rem 0;border-bottom:1px solid rgba(255,255,255,.1);text-align:center}nav a:last-child{border-bottom:none}}@media (max-width:480px){.logo{font-size:1.2rem}nav a{font-size:1rem}}header{background-color:#343a40;color:#fff;padding:.8rem 0;position:sticky;top:0;z-index:100;box-shadow:0 2px 5px rgba(0,0,0,.2);width:100%;left:0;right:0}.header-container{max-width:1200px;margin:0 auto;padding:0 2rem;display:flex;justify-content:space-between;align-items:center}.logo{font-size:1.5rem;margin:0;color:#fff;text-decoration:none;font-weight:700}nav{display:flex;gap:1rem}nav a{color:#fff;text-decoration:none;transition:color .3s ease;position:relative;padding:.5rem 0;font-size:.9rem}nav a:hover{color:#adb5bd}nav a:after{content:"";position:absolute;width:100%;height:2px;bottom:0;left:0;background:linear-gradient(90deg,#007bff,#66a3ff);transform:scaleX(0);transform-origin:bottom right;transition:transform .3s ease}nav a:hover:after{transform:scaleX(1);transform-origin:bottom left}nav a.active{color:#fff}nav a.active:after{transform:scaleX(1);transform-origin:bottom left}.menu-toggle{display:none}@media (max-width:480px){.logo{font-size:1.2rem}nav{padding:1rem}nav a{font-size:1rem;padding:.8rem 0}}@media (max-width:768px){header{padding:1rem 0}.header-container{padding:0 1rem}nav{flex-direction:column;width:100%;position:absolute;top:100%;left:0;background-color:#2c3e50;padding:1.5rem;box-shadow:0 8px 16px rgba(0,0,0,.3);max-height:0;overflow:hidden;opacity:0;transform:translateY(-20px);transition:all .4s ease;border-radius:0 0 12px 12px}nav.active{max-height:400px;opacity:1;transform:translateY(0)}.menu-toggle{display:block;cursor:pointer;width:36px;height:36px;position:relative;z-index:101;border-radius:6px;transition:background-color .3s ease}.menu-toggle:hover{background-color:rgba(255,255,255,.1)}.menu-toggle span,.menu-toggle span:after,.menu-toggle span:before{content:"";display:block;width:24px;height:3px;background-color:#fff;position:absolute;left:6px;transition:all .3s ease;border-radius:3px}.menu-toggle span{top:50%;transform:translateY(-50%)}.menu-toggle span:before{top:-10px}.menu-toggle span:after{top:10px}.menu-toggle.active span{background-color:transparent}.menu-toggle.active span:before{transform:rotate(45deg);top:0}.menu-toggle.active span:after{transform:rotate(-45deg);top:0}nav a{margin:0;padding:1rem 0;border-bottom:1px solid rgba(255,255,255,.1);text-align:center;font-size:1.1rem;font-weight:500;transition:all .2s ease}nav a:hover{background-color:rgba(255,255,255,.1);border-radius:8px;padding-left:1rem;padding-right:1rem}nav a:last-child{border-bottom:none}nav a.active{background-color:rgba(0,123,255,.2);border-radius:8px}}@media (max-width:480px){.logo{font-size:1.2rem}nav{padding:1rem}nav a{font-size:1rem;padding:.8rem 0}.menu-toggle span,.menu-toggle span:after,.menu-toggle span:before{left:3px}}