:root {
  --color-primary: #0b1f3a;
  --color-primary-2: #12305a;
  --color-accent: #2a7fff;
  --color-accent-hover: #1f68d8;
  --color-text: #1a1a1a;
  --color-muted: #667085;
  --color-bg: #ffffff;
  --color-bg-alt: #f7f8fa;
  --color-border: #e5e7eb;

  --font-sans: "Segoe UI", -apple-system, BlinkMacSystemFont, "Inter",
               "Helvetica Neue", Arial, sans-serif;

  --container-max: 1120px;
  --section-pad-y: 5rem;
  --section-pad-y-mobile: 3rem;
  --radius: 8px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 1000;
}
.skip-link:focus { left: 0; }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(ellipse at top right, rgba(42,127,255,0.18), transparent 60%),
    linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-2) 100%);
  color: #fff;
  padding: calc(var(--section-pad-y) + 1rem) 0 var(--section-pad-y);
}

.hero-brand {
  font-size: 4.5rem;
  line-height: 1.05;
  font-weight: 800;
  color: #fff;
  margin: 0 0 1.5rem;
  letter-spacing: -0.025em;
}

.hero-lead {
  font-size: 1.2rem;
  color: #c9d6ea;
  max-width: 680px;
  margin: 0 0 2.25rem;
}

/* ---------- Buttons ---------- */
.btn-cta {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.15s ease, transform 0.15s ease;
  border: 0;
}
.btn-cta:hover,
.btn-cta:focus {
  background: var(--color-accent-hover);
  color: #fff;
  transform: translateY(-1px);
}
.btn-cta:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

/* ---------- Section defaults ---------- */
section {
  padding: var(--section-pad-y) 0;
}

.section-heading {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 2.5rem;
  letter-spacing: -0.01em;
}

/* ---------- Services ---------- */
.services { background: var(--color-bg); }

.service-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  height: 100%;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}
.service-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 10px 30px -12px rgba(11,31,58,0.15);
  transform: translateY(-2px);
}

.service-icon {
  color: var(--color-accent);
  font-size: 2rem;
  display: block;
  margin-bottom: 1rem;
  line-height: 1;
}

.service-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 0.75rem;
}

.service-card p {
  color: var(--color-muted);
  margin: 0;
  font-size: 0.975rem;
}

/* ---------- Expertise ---------- */
.expertise { background: var(--color-bg-alt); }

.chip-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}

.chip {
  display: inline-block;
  padding: 0.45rem 0.95rem;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  background: #fff;
}

/* ---------- Contact ---------- */
.contact {
  background: var(--color-bg);
  text-align: center;
}
.contact .section-heading { margin-bottom: 1rem; }

.contact-lead {
  color: var(--color-muted);
  max-width: 540px;
  margin: 0 auto 2rem;
  font-size: 1.05rem;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-primary);
  color: #9db3d4;
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.875rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  :root {
    --section-pad-y: var(--section-pad-y-mobile);
  }
  .hero-brand { font-size: 3rem; }
  .hero-lead { font-size: 1.05rem; }
  .section-heading { font-size: 1.5rem; margin-bottom: 1.75rem; }
}

/* ---------- Smooth anchor scrolling ---------- */
html { scroll-behavior: smooth; }