:root {
  --ink: #0b2040;
  --muted: #465a72;
  --blue: #0755aa;
  --light-blue: #bde1ff;
  --red: #bf1831;
  --line: #d9e4f0;
  --pale: #edf4fc;
}
body { color: var(--ink); font-family: "Segoe UI", system-ui, sans-serif; }
.container { --bs-gutter-x: 3rem; }
.skip-link { position: absolute; z-index: 1050; background: white; color: var(--ink); padding: .6rem 1rem; }
site-header, site-footer { display: block; }
site-header { position: sticky; top: 0; z-index: 1030; }
header { background: white; box-shadow: 0 1px 0 #0b204019; }
.topbar { background: #091d38; color: #dce9f7; padding: .44rem 0; font-size: .82rem; }
.topbar a { color: inherit; text-decoration: none; }
.topbar a:hover { text-decoration: underline; }
.topbar i { color: #99caff; margin-right: .3rem; }
.navbar { padding: .7rem 0; }
.navbar-brand { padding: 0; }
.navbar-brand img { display: block; width: clamp(134px, 18vw, 183px); height: auto; }
.navbar-nav { gap: clamp(.25rem, 2vw, 1.6rem); }
.navbar .nav-link { font-weight: 650; color: var(--ink); }
.navbar .nav-link:hover, .navbar .nav-link.active { color: var(--blue); }
@media (min-width: 992px) {
  .navbar .nav-link.active { box-shadow: inset 0 -2px var(--blue); }
}
.btn { padding: .72rem 1.12rem; border-radius: .45rem; font-weight: 650; }
.btn i { margin-left: .35rem; }
.btn-brand { --bs-btn-color: white; --bs-btn-bg: var(--red); --bs-btn-border-color: var(--red); --bs-btn-hover-color: white; --bs-btn-hover-bg: #9b1127; --bs-btn-hover-border-color: #9b1127; --bs-btn-active-color: white; --bs-btn-active-bg: #8a1022; --bs-btn-active-border-color: #8a1022; --bs-btn-focus-shadow-rgb: 191,24,49; }
.btn-ghost { --bs-btn-color: white; --bs-btn-border-color: #c4dbf5a8; --bs-btn-hover-color: var(--ink); --bs-btn-hover-bg: white; --bs-btn-hover-border-color: white; --bs-btn-active-color: var(--ink); --bs-btn-active-bg: #dceeff; --bs-btn-active-border-color: #dceeff; }
:focus-visible { outline: 3px solid #207cdb; outline-offset: 4px; }
section[id], main[id] { scroll-margin-top: 7rem; }
.hero {
  --hero-shade: linear-gradient(90deg, #071a34 6%, #0a2140f5 34%, #0b2859ac 62%, #133b6736);
  background: #071a34;
  color: white;
  border-bottom: 4px solid #1b71c7;
}
.hero .carousel-inner { display: grid; }
.hero .carousel-item {
  grid-area: 1 / 1;
  display: block;
  visibility: hidden;
  float: none;
  margin-right: 0;
  padding: clamp(4.1rem, 7.3vw, 7.4rem) 0 clamp(6rem, 8vw, 8rem);
  background: var(--hero-shade), linear-gradient(0deg, #071a347a, #0c2a4640), var(--hero-photo) center / cover;
}
.hero .carousel-item.active, .hero .carousel-item-next, .hero .carousel-item-prev { visibility: visible; }
.hero-infrastructure { --hero-photo: url("../img/ha-tang.jpg"); }
.hero-education { --hero-photo: url("../img/giao-duc.jpg"); }
.hero-training { --hero-photo: url("../img/doi-ngu.jpg"); }
.hero-controls {
  position: absolute;
  z-index: 3;
  inset: auto 0 1.25rem;
  display: flex;
  align-items: center;
  gap: .55rem;
}
.hero-controls .carousel-indicators { position: static; margin: 0 .35rem 0 0; }
.hero-controls .carousel-indicators button { width: 1.55rem; height: .24rem; border-width: 13px 0; border-radius: 0; }
.hero-control {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid #c4dbf5a8;
  border-radius: 50%;
  background: #0b2040b8;
  color: white;
}
.hero-control:hover { background: white; color: var(--ink); }
.eyebrow { display: flex; align-items: center; gap: .65rem; font-size: .76rem; letter-spacing: .115em; font-weight: 750; color: var(--blue); margin-bottom: .95rem; }
.eyebrow span { width: 1.4rem; height: 2px; background: var(--red); flex: none; }
.hero .eyebrow, .contact .eyebrow { color: #c9e4ff; }
.hero .eyebrow span, .contact .eyebrow span { background: #ff6377; }
h1, h2, h3 { font-weight: 750; }
.hero-title { font-size: clamp(2.72rem, 5.35vw, 5.5rem); line-height: 1.08; letter-spacing: -.045em; margin-bottom: 1.35rem; }
.hero-title em { font-style: normal; color: var(--light-blue); }
.hero-copy { color: #dae8f8; font-size: clamp(1rem, 1.5vw, 1.18rem); max-width: 31rem; line-height: 1.65; margin-bottom: 1.8rem; }
.section { padding: clamp(3.4rem, 6.2vw, 6rem) 0; }
.section-intro h2, .contact h2 { font-size: clamp(2rem, 3.1vw, 3.3rem); letter-spacing: -.043em; line-height: 1.12; margin-bottom: .95rem; }
.section-intro p:not(.eyebrow) { color: var(--muted); line-height: 1.65; margin-bottom: 0; }
.services .section-intro { margin-bottom: 1.85rem; }
.service-card { height: 100%; padding: 1.35rem 1.15rem; border: 1px solid var(--line); border-radius: .65rem; background: white; }
.service-card > i { display: inline-grid; place-items: center; width: 2.8rem; height: 2.8rem; background: var(--pale); color: var(--blue); border-radius: .46rem; font-size: 1.24rem; margin-bottom: 1rem; }
.service-card h3 { font-size: 1.09rem; line-height: 1.35; }
.service-card p { font-size: .94rem; line-height: 1.55; color: var(--muted); margin-bottom: 0; }
.products { background: var(--pale); border-block: 1px solid var(--line); }
.accordion { --bs-accordion-border-color: var(--line); --bs-accordion-active-bg: #f9fcff; --bs-accordion-active-color: var(--blue); --bs-accordion-btn-focus-box-shadow: inset 0 0 0 2px #267ad1; }
.accordion-button { color: var(--ink); font-weight: 700; gap: .65rem; }
.accordion-button i { color: var(--blue); font-size: 1.2rem; flex: none; }
.accordion-button::after { margin-left: auto; }
.accordion-body { color: var(--muted); line-height: 1.6; }
.about-photo { display: block; width: 100%; height: auto; aspect-ratio: 1.48; object-fit: cover; border-radius: .7rem; background: var(--pale); }
.check-list { padding: 0; list-style: none; margin: 1.35rem 0; }
.check-list li { display: flex; align-items: baseline; gap: .65rem; margin-bottom: .55rem; }
.check-list i, .text-link { color: var(--blue); }
.text-link { display: inline-block; font-weight: 700; text-underline-offset: .25em; }
.contact { padding: 3rem 0; color: white; background: linear-gradient(115deg, #0b2241, #114c87); }
.contact p:not(.eyebrow) { color: #e0edfa; }
@media (min-width: 992px) { .contact p:not(.eyebrow) { margin-bottom: 0; } }
.footer { padding-top: 2.9rem; color: var(--muted); font-size: .93rem; background: #f5f8fc; }
.footer h2 { color: var(--ink); font-size: 1rem; margin-bottom: .85rem; }
.footer img { display: block; max-width: 100%; height: auto; }
.footer a { color: inherit; text-decoration: none; }
.footer a:hover { color: var(--blue); text-decoration: underline; }
.footer li, .footer address { margin-bottom: .4rem; }
.social-links { display: flex; flex-wrap: wrap; gap: .55rem; }
.footer .social-link {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink);
  background: white;
  font-size: 1.15rem;
}
.footer .social-link:hover { background: var(--blue); color: white; text-decoration: none; }
.back-to-top {
  position: fixed;
  z-index: 1025;
  right: max(1rem, env(safe-area-inset-right));
  bottom: max(1rem, env(safe-area-inset-bottom));
  width: 2.9rem;
  height: 2.9rem;
  border: 1px solid #ffffff88;
  border-radius: 50%;
  background: var(--blue);
  color: white;
  box-shadow: 0 .2rem .8rem #0b204045;
}
.back-to-top:hover { background: var(--ink); }
.footer-bottom { border-top: 1px solid var(--line); margin-top: 2rem; padding: 1rem 0; font-size: .84rem; }
@media (max-width: 991.98px) {
  .navbar-collapse { padding-top: .65rem; }
  .navbar-collapse .btn { margin-top: .45rem; }
}
@media (max-width: 575.98px) {
  .container { --bs-gutter-x: 2rem; }
  section[id], main[id] { scroll-margin-top: 4.75rem; }
  .hero { --hero-shade: linear-gradient(90deg, #071a34f7, #0a2140c9); }
  .hero-title { font-size: clamp(2.25rem, 9.2vw, 3.16rem); text-wrap: balance; }
}