.header{background:#0000;height:70px;left:0;position:fixed;right:0;top:0;transition:background .3s ease;z-index:1000}.header.scrolled{background:linear-gradient(135deg,#475000e1,#500000f5)}.nav{align-items:center;display:flex;height:100%;justify-content:space-between;margin:0 auto;max-width:1200px;padding:0 2rem}.nav-brand a{color:#ecf0f1;font-size:1.5rem;font-weight:700;text-decoration:none}.nav-menu{display:flex;gap:2rem;list-style:none;margin:0;padding:0}.nav-menu li a{color:#bdc3c7;font-weight:500;text-decoration:none;transition:color .3s ease}.nav-menu li a:hover{color:#ecf0f1}.nav-menu li a.active{color:#ecf0f1;font-weight:700}.header-logo{height:48px;max-width:200px;object-fit:contain;width:auto}.auth-button{background:none;border:none;color:#bdc3c7;cursor:pointer;font-size:inherit;font-weight:500;padding:0;text-decoration:none;transition:color .3s 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.2s}.tab-btn.active{border-bottom-color:#475000;color:#475000}.tab-btn:hover{background-color:#f8f9fa}.auth-content{padding:2rem}.auth-form{display:flex;flex-direction:column;gap:1.5rem}.submit-btn{background:linear-gradient(135deg,#475000,#500000);border:none;border-radius:6px;color:#fff;cursor:pointer;font-size:16px;font-weight:500;padding:.75rem 1.5rem;transition:transform .2s,box-shadow .2s}.submit-btn:hover:not(:disabled){box-shadow:0 4px 12px #4750004d;transform:translateY(-1px)}.submit-btn:disabled{cursor:not-allowed;opacity:.6;transform:none}.forgot-password-btn{background:none;border:none;color:#475000;cursor:pointer;font-size:14px;font-weight:500;margin-top:-.5rem;padding:0;text-align:center;text-decoration:underline;transition:color .2s}.forgot-password-btn:hover{color:#500000}.forgot-password-btn:active{opacity:.7}@media screen and (max-width:480px){.auth-popup{max-width:350px;width:95%}.auth-content{padding:1.5rem}.tab-btn{font-size:14px;padding:.75rem}}.cart-button{align-items:center;background:linear-gradient(135deg,#475000,#500000);border:none;border-radius:50px;bottom:20px;box-shadow:0 4px 12px #0000004d;color:#fff;cursor:pointer;display:flex;font-size:16px;font-weight:600;gap:12px;left:20px;padding:12px 24px;position:fixed;transition:transform .2s,box-shadow .2s;z-index:999}.cart-button:hover{box-shadow:0 6px 16px #0006;transform:translateY(-2px)}.cart-button-text{font-size:16px}.cart-button-badge{align-items:center;background-color:#f44;border-radius:50%;color:#fff;display:flex;font-size:14px;font-weight:700;height:24px;justify-content:center;min-width:24px;padding:0 6px}@media screen and (max-width:480px){.cart-button{bottom:15px;font-size:14px;left:15px;padding:10px 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#ffffff14;color:#fff;font-size:2.5rem;margin-bottom:2rem;padding-bottom:1rem;text-align:center}.quy-dinh-section{background:#ffffff0a;border-left:4px solid #ffffff0f;border-radius:12px;box-shadow:0 6px 18px #00000073;margin-bottom:3rem;padding:2rem}.quy-dinh-section h2{border-bottom:2px solid #ffffff0f;color:#fff;font-size:1.8rem;margin-bottom:1.5rem;padding-bottom:.5rem}.quy-dinh-section h3{color:#f1f5f8;font-size:1.4rem;margin-bottom:1rem}.quy-dinh-section p{color:#dbe6ea;font-size:1.1rem;margin-bottom:1rem}.quy-dinh-section ul{margin-left:1rem;text-align:left}.quy-dinh-section li{color:#dbe6ea;font-size:1.1rem;margin-bottom:.5rem;padding-left:.5rem}.quy-dinh-section strong{color:#ffb4a2;font-weight:600}@media (max-width:768px){.quy-dinh{padding:1rem}.quy-dinh-section{margin-bottom:2rem;padding:1.5rem}}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid 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