header {
  width: 100%;
  position: relative;
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
}
#header-2.sticky {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1030;
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
}
#header-2 .navbar {
  padding: 0.8rem 1rem;
}
#header-2 .navbar-brand img {
  height: 50px;
}
#header-2 .nav-link {
  color: #fff !important;
  transition: color 0.3s;
  font-size: 1.1rem;
}
#header-2 .active {
  color: #ffc107 !important;
  font-size: 1.1rem;
}

#header-2 .nav-link:hover {
  color: #ffc107 !important;
}
#header-2 .navbar-toggler {
  border: none;
}
#header-2 .btn {
  font-weight: bold;
  border-radius: 50px;
  padding: 10px 20px;
}
#header-2 .btn-login {
  background-color: transparent;
  color: #fff;
  border: 2px solid #fff;
}
#header-2 .btn-login:hover {
  background-color: #fff;
  color: #000;
}
#header-2 .btn-register {
  background-color: #ffc107;
  color: #000;
  border: none;
}
#header-2 .btn-register:hover {
  background-color: #e0a800;
}



#link-section-9 {
  position: relative;
  background: var(--bottom-color);
  color: var(--text-color);
  text-align: center;
  overflow: hidden;
  padding: 6rem 0;
}

/* Lớp nền trên */
#link-section-9 .upper-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 50%;
  background: var(--top-color);
  z-index: 0;
}

/* Sóng chia giữa */
#link-section-9 .upper-bg .wave-bottom {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  overflow: hidden;
}
#link-section-9 .upper-bg .wave-bottom svg {
  display: block;
  width: calc(100% + 1px);
  height: 80px;
}
#link-section-9 .upper-bg .wave-bottom path {
  fill: var(--bottom-color);
}

/* Nội dung giữ nổi trên lớp nền */
#link-section-9 .container {
  position: relative;
  z-index: 1;
}

#link-section-9 .section-title {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

#link-section-9 .section-subtitle {
  font-size: 1.125rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

/* Các nút liên kết */
#link-section-9 .link-item {
  background: rgba(255,255,255,0.2);
  border-radius: 0.75rem;
  padding: 1.5rem;
  text-decoration: none;
  color: var(--text-color);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s, transform 0.3s;
}
#link-section-9 .link-item:hover {
  background: rgba(255,255,255,0.35);
  transform: translateY(-4px);
}
#link-section-9 .link-item i {
  font-size: 1.25rem;
  margin-right: 0.5rem;
}





#footer-3 {
  background-color: var(--footer-bg-color, #ffffff);
  color: var(--footer-text-color, #555555);
  padding: 3rem 0;
  text-align: center; /* Default center alignment */
  font-size: 0.9rem;
}
#footer-3 .footer-logo-main {
  max-height: 60px;
  margin-bottom: 0.75rem;
}
#footer-3 .footer-tagline {
  font-size: 1rem;
  color: var(--footer-text-color, #555555);
  opacity: 0.8;
  margin-bottom: 2rem;
}
#footer-3 .footer-block-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--footer-text-color);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}
#footer-3 .footer-block-title:first-child {
  margin-top: 0;
}
#footer-3 .footer-main-menus ul,
#footer-3 .footer-partner-links ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem; /* row-gap column-gap */
}
#footer-3 .footer-main-menus a,
#footer-3 .footer-partner-links a {
  color: var(--footer-link-color, #0066cc);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}
#footer-3 .footer-main-menus a:hover,
#footer-3 .footer-main-menus a.active,
#footer-3 .footer-partner-links a:hover {
  color: var(--footer-link-hover-color, #004c99);
  text-decoration: underline;
}
#footer-3 .footer-separator {
  border-top: 1px solid var(--footer-separator-color, #dddddd);
  margin: 2rem auto; /* Centered separator */
  width: 80%;
  max-width: 600px;
}
#footer-3 .footer-social-icons-list a {
  color: var(--footer-social-icon-color, #777777);
  margin: 0 0.75rem;
  font-size: 1.2rem;
  transition: color 0.2s ease;
}
#footer-3 .footer-social-icons-list a:hover {
  color: var(--footer-social-icon-hover-color, #0066cc);
}
#footer-3 .footer-copyright {
  font-size: 0.8rem;
  color: var(--footer-text-color, #555555);
  opacity: 0.7;
  margin-top: 1.5rem;
}
#footer-3 .footer-copyright p {
  margin-bottom: 0;
}