#header-10 {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%; /* chiếm toàn chiều ngang */
  height: 64px; /* hoặc auto tuỳ logo */
  background-color: #1a1a1a;
  color: #fff;
  z-index: 1050;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
}
/* logo */
#header-10 .navbar-brand img {
  max-height: 48px;
  max-width: 140px;
  margin-bottom: 0; /* bỏ khoảng trống cũ */
}
/* thanh điều hướng ngang */
#header-10 nav {
  width: auto;
}
#header-10 .navbar-nav {
  flex-direction: row; /* xếp ngang */
  align-items: center;
  gap: 0.25rem;
  margin: 0;
}
#header-10 .nav-item {
  width: auto;
}
#header-10 .nav-link {
  color: #ccc;
  font-weight: 500;
  padding: 0.75rem 1rem;
  transition: all 0.3s;
}
#header-10 .nav-link.active,
#header-10 .nav-link:hover {
  color: #fff;
  background-color: #007bff;
  border-radius: 6px;
}
/* nút CTA nằm bên phải */
#header-10 .cta-button {
  margin-left: 1rem;
  background-color: #00b4d8;
  color: #fff;
  padding: 0.6rem 1.25rem;
  border-radius: 25px;
  font-weight: 600;
  transition: 0.3s ease;
}
#header-10 .cta-button:hover {
  background-color: #0096c7;
}
/* ===== Mobile (<= 991.98 px) ===== */
@media (max-width: 991.98px) {
  #header-10 {
    height: auto; /* cho phép header cao dần */
    flex-wrap: wrap;
    padding: 0.75rem 1rem;
  }
  /* Ẩn menu, bật khi nhấn nút burger (tuỳ bạn thêm JS-toggle) */
  #header-10 nav {
    order: 3;
    width: 100%;
    display: none;
  }
  #header-10.active nav {
    display: block;
  }
  #header-10 .navbar-nav {
    flex-direction: column;
    align-items: flex-start;
  }
  #header-10 .cta-button {
    margin: 0.5rem 0 0;
  }
}



#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-15 Styles - Creative Separator */
#footer-15 {
  background-color: #1a1a2e; /* Dark blue/purple base */
  color: #e0e0e0; /* Light grey text */
  padding-top: 4rem; /* Padding for the top section */
  position: relative; /* For pseudo-elements if used for separator */
  font-size: 0.9rem;
}
#footer-15 .footer-upper-content-f15 {
  padding-bottom: 4rem; /* Space before the separator visual */
  position: relative;
  z-index: 2; /* Ensure content is above any background pseudo-elements */
}
#footer-15 .footer-logo-f15 {
  max-height: 50px;
  margin-bottom: 1rem;
  /* filter: brightness(0) invert(1) opacity(0.9);*/ /* Light logo on dark bg */
}
#footer-15 .site-name-text-f15 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #ffffff;
  text-decoration: none;
  margin-bottom: 0.5rem;
  display: block;
}
#footer-15 .site-name-text-f15:hover {
  color: #c7ecee; /* Lighter teal for hover */
}
#footer-15 .creative-statement-f15 {
  font-size: 1rem;
  line-height: 1.6;
  font-style: italic;
  color: #b3b3cc; /* Lighter shade for statement */
  margin-bottom: 0;
}
#footer-15 .section-title-f15 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #ffffff; /* White titles */
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
#footer-15 .nav-menu-list-f15 {
  list-style: none;
  padding-left: 0;
}
#footer-15 .nav-menu-list-f15 li {
  margin-bottom: 0.7rem;
}
#footer-15 .nav-menu-list-f15 a {
  color: #9a9aff; /* Light purple/blue links */
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}
#footer-15 .nav-menu-list-f15 a:hover,
#footer-15 .nav-menu-list-f15 a.active {
  color: #ffffff;
  padding-left: 8px;
  text-decoration: none;
}
/* Creative Separator - Example using ::after on upper content */
#footer-15 .footer-upper-content-f15::after {
  content: "";
  position: absolute;
  bottom: -2px; /* Adjust to sit on the edge or slightly overlap */
  left: 0;
  width: 100%;
  height: 60px; /* Height of the wave/angle */
  /* Example: Angled separator using linear gradient */
  background: linear-gradient(to right bottom, transparent 49.5%, #0f0f1a 50%),
    linear-gradient(to left bottom, transparent 49.5%, #0f0f1a 50%);
  background-repeat: no-repeat;
  background-position: left bottom, right bottom;
  background-size: 50.1% 100%, 50.1% 100%; /* 50.1% to avoid thin line at center */
  /* Example: SVG Wave - more complex, requires an SVG */
  /* background-image: url('data:image/svg+xml,...'); replace with actual SVG */
  /* background-size: cover; */
  /* background-repeat: no-repeat; */
  /* background-position: bottom center; */
  z-index: 1;
}
#footer-15 .footer-lower-content-f15 {
  background-color: #0f0f1a; /* Darker section below separator */
  color: #a0a0c0; /* Text color for lower section */
  padding: 3rem 0 2rem 0;
  position: relative;
  z-index: 2; /* Ensure content is above any background pseudo-elements */
}
#footer-15 .lower-content-title-f15 {
  font-size: 0.95rem;
  font-weight: 500;
  color: #d0d0e0; /* Lighter titles for lower section */
  margin-bottom: 0.75rem;
}
#footer-15 .contact-essentials-f15 p,
#footer-15 .contact-essentials-f15 a {
  margin-bottom: 0.3rem;
  color: #a0a0c0;
  text-decoration: none;
  font-size: 0.9rem;
}
#footer-15 .contact-essentials-f15 i {
  margin-right: 0.5rem;
  color: #9a9aff; /* Link color for icons */
}
#footer-15 .contact-essentials-f15 a:hover {
  color: #c7ecee;
}
#footer-15 .partner-links-list-f15 {
  list-style: none;
  padding-left: 0;
  margin-bottom: 1.5rem; /* Space before copyright */
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start; /* Or center if preferred */
  gap: 0.5rem 1rem;
}
#footer-15 .partner-links-list-f15 a {
  color: #9a9aff;
  text-decoration: none;
  font-size: 0.85rem;
}
#footer-15 .partner-links-list-f15 a:hover {
  color: #ffffff;
  text-decoration: underline;
}
#footer-15 .copyright-text-f15 {
  text-align: center;
  font-size: 0.8rem;
  opacity: 0.7;
  padding-top: 1.5rem;
  border-top: 1px solid #30304a; /* Subtle border for copyright */
}
#footer-15 .copyright-text-f15 p {
  margin-bottom: 0;
}
@media (max-width: 991.98px) {
  #footer-15 .footer-upper-content-f15 .text-lg-start {
    text-align: center !important;
  }
  #footer-15 .footer-upper-content-f15::after {
    /* Simplify or remove complex separator on mobile */
    /* background: none;
        height: 2px;
        background-color: #0f0f1a;
        bottom: 0; */
    /* The angled one still looks ok on mobile */
  }
}
@media (max-width: 767.98px) {
  #footer-15 .footer-column-f15 {
    margin-bottom: 2.5rem;
  }
  #footer-15 .partner-links-list-f15,
  #footer-15 .contact-essentials-f15 {
    text-align: center;
    justify-content: center;
  }
}