:root {
  --blue: #3dbeee;
  --blue-dark: #1592c4;
  --navy: #0f2233;
  --ink: #1d2733;
  --muted: #5b6b7a;
  --bg: #ffffff;
  --bg-alt: #f3f7fa;
  --line: #dde6ee;
  --radius: 10px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Be Vietnam Pro", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: var(--blue-dark); }
h1, h2, h3 { line-height: 1.25; margin: 0 0 .6em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); color: var(--navy); }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
.eyebrow {
  margin: 0 0 .5em;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--blue-dark);
}

/* Header */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, .95);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}
.topbar__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--navy); }
.brand span { display: flex; flex-direction: column; line-height: 1.1; }
.brand strong { letter-spacing: .08em; }
.brand small { font-size: .65rem; letter-spacing: .16em; color: var(--muted); }
.nav { display: flex; gap: 22px; align-items: center; }
.nav a { text-decoration: none; color: var(--ink); font-weight: 500; font-size: .95rem; }
.nav__cta { background: var(--blue); color: #fff !important; padding: 8px 16px; border-radius: 999px; }

/* Hero */
.hero {
  color: #fff;
  background:
    linear-gradient(100deg, rgba(10, 28, 44, .92) 0%, rgba(10, 28, 44, .7) 55%, rgba(10, 28, 44, .35) 100%),
    url("../img/hero.jpg") center / cover no-repeat;
}
.hero__inner { padding: 96px 16px 104px; max-width: 1120px; }
.hero .eyebrow { color: var(--blue); }
.hero h1 { font-size: clamp(1.9rem, 4.6vw, 3.1rem); max-width: 22ch; }
.hero__info { list-style: none; margin: 24px 0 0; padding: 0; display: grid; gap: 8px; max-width: 62ch; color: #d6e4ee; }
.hero__info span {
  display: inline-block; min-width: 92px; margin-right: 8px;
  font-size: .78rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--blue);
}
.hero__info a { color: #fff; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn { display: inline-block; padding: 12px 22px; border-radius: 999px; font-weight: 600; text-decoration: none; }
.btn--primary { background: var(--blue); color: #fff; }
.btn--ghost { border: 1px solid rgba(255, 255, 255, .6); color: #fff; }

/* Sections */
.section { padding: 80px 0; }
.section--alt { background: var(--bg-alt); }

.section__head { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; }
.btn--outline { border: 1px solid var(--blue); color: var(--blue-dark); margin-bottom: .6em; }
.btn--outline:hover { background: var(--blue); color: #fff; }

.services {
  list-style: none; margin: 32px 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  counter-reset: svc;
}
.services li {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 20px; counter-increment: svc;
}
.services li::before {
  content: counter(svc, decimal-leading-zero);
  display: block; font-weight: 700; color: var(--blue); margin-bottom: 8px;
}
.services h3 { font-size: 1.05rem; color: var(--navy); margin-bottom: .3em; }
.services p { margin: 0; color: var(--muted); font-size: .92rem; }

.segments { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 32px; }
.segments figure { margin: 0; position: relative; border-radius: var(--radius); overflow: hidden; aspect-ratio: 3 / 4; }
.segments img { width: 100%; height: 100%; object-fit: cover; }
.segments figcaption {
  position: absolute; inset: auto 0 0 0; padding: 40px 16px 14px;
  color: #fff; font-weight: 600;
  background: linear-gradient(transparent, rgba(10, 28, 44, .85));
}

/* Dải công trình tự chạy */
.marquee { overflow: hidden; margin-top: 24px; mask-image: linear-gradient(90deg, transparent, #000 4%, #000 96%, transparent); }
.marquee__track { display: flex; gap: 16px; width: max-content; animation: marquee 60s linear infinite; }
.marquee:hover .marquee__track { animation-play-state: paused; }
@keyframes marquee { to { transform: translateX(calc(-50% - 8px)); } }
@media (prefers-reduced-motion: reduce) {
  .marquee { overflow-x: auto; }
  .marquee__track { animation: none; }
}
.pcard {
  flex: 0 0 300px; text-decoration: none; color: var(--ink);
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  transition: transform .2s, box-shadow .2s;
}
.pcard:hover { transform: translateY(-4px); box-shadow: 0 10px 24px rgba(15, 34, 51, .12); }
.pcard img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.pcard__body { display: block; padding: 12px 14px 14px; }
.pcard__body b { display: block; color: var(--navy); }
.pcard__body small { color: var(--muted); }

/* Trang tất cả công trình */
.page-head { background: var(--navy); color: #fff; padding: 64px 0 48px; }
.page-head h1 { font-size: clamp(1.9rem, 4vw, 2.6rem); }
.page-head p { color: #b9cad8; margin: 0; }
.page-head .eyebrow { color: var(--blue); }
.project-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.project {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  scroll-margin-top: 80px;
}
.project.is-target { outline: 3px solid var(--blue); }
.project img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.project__body { padding: 16px 18px 18px; }
.project h3 { font-size: 1.05rem; color: var(--navy); margin-bottom: .2em; }
.project__sub { margin: 0 0 10px; color: var(--blue-dark); font-size: .9rem; font-weight: 500; }
.project ul { margin: 0; padding-left: 18px; color: var(--muted); font-size: .9rem; }

.contact { background: var(--navy); color: #fff; }
.contact h2 { color: #fff; }
.contact .eyebrow { color: var(--blue); }
.contact p { color: #b9cad8; }
.contact__inner { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; }
.contact__list { margin: 0; display: grid; grid-template-columns: max-content 1fr; gap: 12px 24px; }
.contact__list dt { color: var(--blue); font-weight: 600; }
.contact__list dd { margin: 0; }
.contact__list a { color: #fff; }

.footer { background: #0a1825; color: #8aa0b2; font-size: .85rem; padding: 18px 0; text-align: center; }

@media (max-width: 900px) {
  .services, .segments { grid-template-columns: repeat(2, 1fr); }
  .contact__inner { grid-template-columns: 1fr; gap: 28px; }
  .project-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .nav a:not(.nav__cta) { display: none; }
  .project-grid { grid-template-columns: 1fr; }
  .pcard { flex-basis: 240px; }
  .hero__info span { display: block; }
  .section { padding: 56px 0; }
  .hero__inner { padding: 72px 16px 80px; }
  .contact__list { grid-template-columns: 1fr; gap: 2px; }
  .contact__list dd { margin-bottom: 10px; }
}