.container{max-width:980px;margin:20px auto;padding:0 15px}header.site-header{background:linear-gradient(90deg,#0d6efd,#0aa3ff);color:#fff;padding:30px;text-align:center;border-radius:6px}h1{margin:0} .login-wrap{max-width:360px;margin:80px auto;padding:20px;background:#fff;border-radius:8px;box-shadow:0 6px 18px rgba(0,0,0,0.08)} input{width:100%;padding:10px;margin:8px 0;border:1px solid #ddd;border-radius:6px} button{background:#0d6efd;color:#fff;border:none;padding:10px;border-radius:6px;width:100%} .contact-float{position:fixed;right:16px;bottom:16px;display:flex;flex-direction:column;gap:10px} .cf{display:flex;align-items:center;justify-content:center;width:64px;height:64px;border-radius:50%;box-shadow:0 6px 18px rgba(0,0,0,0.15);text-decoration:none;color:#fff;font-size:22px} .cf-phone{background:linear-gradient(90deg,#16a34a,#059669)} .cf-zalo{background:linear-gradient(90deg,#2ea1f6,#0aa3ff)} .cf-messenger{background:linear-gradient(90deg,#1877f2,#4a8cf5)} .error{color:red;padding:8px;background:#ffecec;border-radius:6px;margin-bottom:10px} nav.topbar{background:#0d6efd;color:#fff;padding:12px 20px;display:flex;justify-content:space-between}