:root {
  --blue: #1d8dcc;
  --blue-deep: #0f5f94;
  --green: #2f8f67;
  --amber: #f2b33d;
  --ink: #182433;
  --muted: #5d6978;
  --line: #dfe7ee;
  --surface: #ffffff;
  --soft: #f5f8fb;
  --warm: #fff8ea;
  --shadow: 0 16px 40px rgba(22, 37, 54, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  background: var(--surface);
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
}

address {
  font-style: normal;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.skip-link {
  position: fixed;
  left: 12px;
  top: -60px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid rgba(223, 231, 238, 0.85);
  backdrop-filter: blur(16px);
}

.nav-wrap {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
}

.brand img {
  width: 210px;
  height: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  font-weight: 700;
  color: #24364a;
}

.site-nav a {
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus {
  color: var(--blue-deep);
}

.nav-call {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border-radius: 8px;
  color: #fff;
  background: var(--blue);
  white-space: nowrap;
}

.site-nav .nav-call:hover,
.site-nav .nav-call:focus {
  color: #fff;
  background: var(--blue-deep);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.menu-toggle span {
  width: 20px;
  height: 2px;
  background: var(--ink);
}

.hero {
  position: relative;
  min-height: 640px;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fff;
}

.hero-media,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-media {
  background-image: url("../images/du-an-bien-bep-ba-son-hoi-an.jpg");
  background-position: center;
  background-size: cover;
  transform: scale(1.02);
}

.hero-overlay {
  background:
    linear-gradient(90deg, rgba(8, 23, 37, 0.9), rgba(8, 23, 37, 0.62) 52%, rgba(8, 23, 37, 0.14)),
    linear-gradient(0deg, rgba(8, 23, 37, 0.3), rgba(8, 23, 37, 0));
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 120px 0 88px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  color: var(--amber);
  font-size: 0.9rem;
  font-weight: 800;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: 3.75rem;
  line-height: 1.08;
}

.hero-lead {
  max-width: 680px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.92);
  font-size: 1.22rem;
}

.hero-actions,
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0 20px;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  color: #fff;
  background: var(--blue);
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--blue-deep);
}

.btn-secondary {
  color: #fff;
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.46);
}

.btn-light {
  color: var(--ink);
  background: #fff;
  border-color: rgba(255, 255, 255, 0.65);
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  max-width: 830px;
  margin: 42px 0 0;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
}

.hero-facts div {
  min-height: 96px;
  padding: 18px;
  border-right: 1px solid rgba(255, 255, 255, 0.24);
}

.hero-facts div:last-child {
  border-right: 0;
}

.hero-facts dt {
  margin: 0 0 4px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
}

.hero-facts dd {
  margin: 0;
  font-weight: 800;
}

.section {
  padding: 82px 0;
}

.section-head {
  max-width: 720px;
  margin-bottom: 34px;
}

.section h2 {
  margin: 0;
  font-size: 2.25rem;
  line-height: 1.18;
}

.section-head p:last-child,
.intro-points p,
.area-grid p,
.quote-grid p,
.site-footer p {
  color: var(--muted);
}

.intro-band {
  background: var(--soft);
  border-bottom: 1px solid var(--line);
}

.intro-grid,
.area-grid,
.quote-grid,
.footer-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
  align-items: start;
}

.intro-points {
  display: grid;
  gap: 16px;
}

.intro-points p {
  margin: 0;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.service-card,
.project-card,
.process-list li,
.contact-card,
.faq-list details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.service-card {
  min-height: 190px;
  padding: 24px;
}

.service-card h3,
.project-card h3,
.process-list h3 {
  margin: 0 0 10px;
  font-size: 1.16rem;
  line-height: 1.3;
}

.service-card p,
.project-card p,
.process-list p,
.faq-list p {
  margin: 0;
  color: var(--muted);
}

.evidence-section {
  background: linear-gradient(180deg, #ffffff, #f7fafc);
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.project-card {
  overflow: hidden;
  box-shadow: none;
}

.project-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--soft);
}

.project-card div {
  padding: 18px;
}

.project-card-large {
  grid-column: span 2;
}

.project-card-large img {
  aspect-ratio: 16 / 9;
}

.process-section {
  background: #fff;
}

.process-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.process-list li {
  min-height: 230px;
  padding: 24px;
}

.process-list span {
  display: inline-flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  border-radius: 50%;
  color: #fff;
  background: var(--green);
  font-weight: 800;
}

.area-section {
  background: var(--warm);
}

.area-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.area-list li {
  min-height: 44px;
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid rgba(242, 179, 61, 0.42);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  font-weight: 800;
}

.area-list a {
  display: flex;
  width: 100%;
  min-height: 28px;
  align-items: center;
  color: inherit;
  text-decoration: none;
}

.area-list a:hover,
.area-list a:focus {
  color: var(--blue-deep);
}

.quote-section {
  color: #fff;
  background: #1a2838;
}

.quote-section .section-kicker,
.quote-section p {
  color: rgba(255, 255, 255, 0.78);
}

.contact-card {
  display: grid;
  gap: 12px;
  padding: 26px;
  color: var(--ink);
  box-shadow: var(--shadow);
}

.contact-card strong {
  font-size: 1.12rem;
}

.contact-card a {
  color: var(--blue-deep);
  font-weight: 800;
  text-decoration: none;
}

.faq-section {
  background: var(--soft);
}

.faq-list {
  display: grid;
  gap: 12px;
  max-width: 860px;
}

.faq-list details {
  padding: 18px 20px;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 800;
}

.faq-list p {
  padding-top: 12px;
}

.site-footer {
  padding: 54px 0 34px;
  background: #ffffff;
  border-top: 1px solid var(--line);
}

.site-footer h2 {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.site-footer a {
  color: var(--blue-deep);
  font-weight: 800;
  text-decoration: none;
}

.footer-bottom {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.footer-bottom p {
  margin: 0;
}

.mobile-cta {
  display: none;
}

.service-card h3 a,
.project-card h3 a {
  color: inherit;
  text-decoration: none;
}

.service-card h3 a:hover,
.service-card h3 a:focus,
.project-card h3 a:hover,
.project-card h3 a:focus {
  color: var(--blue-deep);
}

.page-hero {
  padding: 72px 0;
  background: var(--soft);
  border-bottom: 1px solid var(--line);
}

.page-hero-grid {
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  gap: 44px;
  align-items: center;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.breadcrumb a {
  color: var(--blue-deep);
  text-decoration: none;
}

.page-hero h1 {
  margin: 0;
  font-size: 3rem;
  line-height: 1.12;
}

.page-hero p:not(.section-kicker) {
  max-width: 660px;
  color: var(--muted);
  font-size: 1.08rem;
}

.page-hero .btn-secondary {
  color: var(--ink);
  background: #fff;
  border-color: var(--line);
}

.page-hero img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 36px;
  align-items: start;
}

.content-main {
  display: grid;
  gap: 18px;
}

.content-block,
.sidebar-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.content-block {
  padding: 28px;
}

.content-block h2,
.sidebar-card h2 {
  margin: 0 0 14px;
  font-size: 1.45rem;
  line-height: 1.28;
}

.content-block p,
.sidebar-card p,
.sidebar-card span {
  color: var(--muted);
}

.content-block p:last-child {
  margin-bottom: 0;
}

.case-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.case-gallery figure {
  margin: 0;
}

.case-gallery img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 8px;
}

.case-gallery figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.content-sidebar {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 16px;
}

.sidebar-card {
  display: grid;
  gap: 12px;
  padding: 22px;
}

.sidebar-card .btn {
  width: 100%;
}

.related-card a {
  color: var(--blue-deep);
  font-weight: 800;
  text-decoration: none;
}

.faq-list.compact {
  max-width: none;
}

@media (max-width: 900px) {
  .container {
    width: min(100% - 28px, 720px);
  }

  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    left: 14px;
    right: 14px;
    top: 72px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    min-height: 46px;
    display: flex;
    align-items: center;
    padding: 0 12px;
  }

  .nav-call {
    margin-top: 8px;
  }

  .hero {
    min-height: 610px;
  }

  .hero-overlay {
    background: linear-gradient(90deg, rgba(8, 23, 37, 0.92), rgba(8, 23, 37, 0.7));
  }

  .hero-content {
    padding: 88px 0 70px;
  }

  .hero h1 {
    font-size: 2.45rem;
  }

  .hero-lead {
    font-size: 1.08rem;
  }

  .hero-facts,
  .service-grid,
  .project-grid,
  .process-list,
  .intro-grid,
  .area-grid,
  .quote-grid,
  .footer-grid,
  .page-hero-grid,
  .content-layout {
    grid-template-columns: 1fr;
  }

  .hero-facts div {
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.24);
  }

  .hero-facts div:last-child {
    border-bottom: 0;
  }

  .section {
    padding: 60px 0;
  }

  .section h2 {
    font-size: 1.9rem;
  }

  .project-card-large {
    grid-column: auto;
  }

  .case-gallery {
    grid-template-columns: 1fr;
  }

  .content-sidebar {
    position: static;
  }

  .page-hero h1 {
    font-size: 2.25rem;
  }

  .area-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  body {
    padding-bottom: 64px;
  }

  .brand img {
    width: 176px;
  }

  .hero {
    min-height: calc(100svh - 72px);
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-facts {
    display: none;
  }

  .btn {
    width: 100%;
  }

  .hero-actions,
  .contact-actions {
    width: 100%;
  }

  .service-card,
  .process-list li,
  .contact-card {
    padding: 20px;
  }

  .area-list {
    grid-template-columns: 1fr;
  }

  .mobile-cta {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 30;
    display: grid;
    grid-template-columns: 1fr 1fr;
    border-top: 1px solid rgba(255, 255, 255, 0.22);
    box-shadow: 0 -8px 22px rgba(17, 29, 42, 0.18);
  }

  .mobile-cta a {
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    background: var(--blue);
    font-weight: 900;
    text-decoration: none;
  }

  .mobile-cta a:last-child {
    background: var(--green);
  }
}