* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Source Sans Pro", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  color: #1f2933;
  background-color: #f8fafc;
  line-height: 1.6;
}

a {
  color: #0b7285;
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.top-bar {
  background: #102a43;
  color: #f0f4f8;
  padding: 0.6rem 0;
  font-size: 0.95rem;
}

.top-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand__logo {
  width: 54px;
  height: auto;
  filter: drop-shadow(0 6px 14px rgba(11, 114, 133, 0.35));
}

.brand__text {
  display: flex;
  flex-direction: column;
}

.brand__name {
  display: block;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.brand__tagline {
  font-weight: 300;
  font-size: 0.85rem;
  color: #d9e2ec;
}

.top-bar__contact {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.top-bar__contact a {
  color: #f0f4f8;
}

.main-nav {
  background: #243b53;
  color: #f0f4f8;
  position: sticky;
  top: 0;
  z-index: 10;
}

.main-nav .container {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.75rem 0;
}

.main-nav a {
  color: inherit;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.main-nav a:hover,
.main-nav a:focus {
  color: #69c0ff;
}

.hero {
  background: linear-gradient(135deg, #243b53, #0b7285);
  color: #f0f4f8;
  padding: 5rem 0 4rem;
}

.hero__content {
  max-width: 620px;
}

.hero h1 {
  margin-top: 0;
  font-size: clamp(2.4rem, 3vw + 1rem, 3.2rem);
  line-height: 1.2;
}

.hero p {
  font-size: 1.1rem;
  margin-bottom: 1.8rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  background: #f0b429;
  color: #102a43;
  border-radius: 999px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button:hover,
.button:focus {
  transform: translateY(-2px);
  box-shadow: 0 10px 18px rgba(0, 0, 0, 0.15);
  text-decoration: none;
}

.section {
  padding: 4.5rem 0;
}

.section.alt {
  background: #edf2f7;
}

.section h2 {
  margin-top: 0;
  font-size: clamp(2rem, 2vw + 1rem, 2.4rem);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 2rem;
  color: #102a43;
}

.section__grid {
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

@media (min-width: 800px) {
  .section__grid {
    grid-template-columns: 1.3fr 1fr;
  }
}

.card {
  background: #ffffff;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 18px 38px -18px rgba(15, 23, 42, 0.4);
  border: 1px solid rgba(15, 23, 42, 0.08);
}

.card h3 {
  margin-top: 0;
}

.list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.list li {
  margin-bottom: 0.6rem;
}

.list--contact li {
  margin-bottom: 0.9rem;
}

.expertise-grid {
  display: grid;
  gap: 1.8rem;
}

@media (min-width: 900px) {
  .expertise-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.expertise-card {
  background: #ffffff;
  border-radius: 14px;
  padding: 1.8rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 10px 26px -16px rgba(15, 23, 42, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.expertise-card:hover,
.expertise-card:focus-within {
  transform: translateY(-6px);
  box-shadow: 0 22px 40px -18px rgba(15, 23, 42, 0.4);
}

.expertise-card h3 {
  margin-top: 0;
  color: #0b7285;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 1rem;
}

.timeline {
  display: grid;
  gap: 1.8rem;
}

@media (min-width: 800px) {
  .timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.timeline__item {
  background: #ffffff;
  border-radius: 14px;
  padding: 1.8rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  position: relative;
  overflow: hidden;
}

.timeline__step {
  position: absolute;
  top: -20px;
  right: 20px;
  font-size: 5rem;
  font-weight: 700;
  color: rgba(15, 23, 42, 0.08);
}

.timeline__item h3 {
  margin-top: 0;
  color: #0b7285;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 1rem;
}

.footer {
  background: #102a43;
  color: #f0f4f8;
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.9rem;
}

@media (max-width: 600px) {
  .top-bar .container,
  .main-nav .container {
    flex-direction: column;
    align-items: flex-start;
  }

  .timeline__step {
    font-size: 4rem;
    right: 10px;
  }
}