:root {
  --navy: #071a33;
  --navy-light: #0d2b50;
  --blue: #1769aa;
  --cyan: #19a7ce;
  --white: #ffffff;
  --light: #f4f7fa;
  --text: #182536;
  --muted: #637083;
  --border: #dce4ec;
  --shadow: 0 20px 60px rgba(7, 26, 51, 0.12);
  --radius: 18px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.65;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(var(--container), calc(100% - 48px));
  margin: 0 auto;
}

/* =========================
   NAVIGATION
========================= */

.site-header {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 20;
  padding: 22px 0;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

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

.brand-logo {
  width: 190px;
  height: auto;
  object-fit: contain;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 30px;
  margin-left: auto;
}

.main-nav a {
  color: rgba(255, 255, 255, 0.92);
  font-size: 14px;
  font-weight: 600;
  transition: opacity 0.2s ease;
}

.main-nav a:hover {
  opacity: 0.7;
}

.nav-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 19px;
  border: 1px solid rgba(255, 255, 255, 0.55);
  border-radius: 999px;
  color: var(--white);
  font-size: 14px;
  font-weight: 700;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-button:hover {
  background: var(--white);
  color: var(--navy);
}

/* =========================
   HERO
========================= */

.hero {
  min-height: 780px;
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--navy);
}

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

.hero-background img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  background:
    linear-gradient(
      90deg,
      rgba(3, 18, 38, 0.94) 0%,
      rgba(5, 27, 52, 0.78) 45%,
      rgba(5, 27, 52, 0.30) 100%
    );
}

.hero-content {
  position: relative;
  z-index: 2;
  padding-top: 110px;
  max-width: 1180px;
}

.eyebrow,
.section-label {
  color: var(--cyan);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  margin-bottom: 18px;
}

.hero h1 {
  max-width: 780px;
  color: var(--white);
  font-size: clamp(44px, 6vw, 76px);
  line-height: 1.03;
  letter-spacing: -0.045em;
  font-weight: 750;
}

.hero h1 span,
.intro h2 span,
.section-heading h2 span,
.technology h2 span,
.tbbd h2 span,
.why-us h2 span,
.approach h2 span,
.contact h2 span {
  color: var(--cyan);
}

.hero-text {
  max-width: 670px;
  margin-top: 28px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 18px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 38px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 750;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--cyan);
  color: var(--white);
  box-shadow: 0 10px 30px rgba(25, 167, 206, 0.25);
}

.button-primary:hover {
  background: #148fb1;
}

.button-secondary {
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: var(--white);
}

.button-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* =========================
   INTRO
========================= */

.intro {
  padding: 120px 0;
  background: var(--white);
}

.intro-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 90px;
  align-items: start;
}

.intro h2,
.section-heading h2,
.technology h2,
.tbbd h2,
.why-us h2,
.approach h2,
.contact h2 {
  color: var(--navy);
  font-size: clamp(36px, 4vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.intro-copy {
  color: var(--muted);
  font-size: 17px;
}

.intro-copy p + p {
  margin-top: 22px;
}

/* =========================
   SERVICES
========================= */

.services {
  padding: 120px 0;
  background: var(--light);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 55px;
}

.section-heading > p:last-child {
  margin-top: 20px;
  color: var(--muted);
  font-size: 17px;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.service-card {
  min-height: 300px;
  padding: 32px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 10px 35px rgba(7, 26, 51, 0.04);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.service-number {
  margin-bottom: 48px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.service-card h3 {
  margin-bottom: 13px;
  color: var(--navy);
  font-size: 21px;
  line-height: 1.25;
}

.service-card p {
  color: var(--muted);
  font-size: 15px;
}

/* =========================
   TECHNOLOGY
========================= */

.technology {
  padding: 120px 0;
  background: var(--navy);
}

.technology h2 {
  color: var(--white);
}

.technology > .container {
  color: var(--white);
}

.technology-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 100px;
  align-items: center;
}

.technology-grid > div:first-child > p:not(.section-label) {
  margin-top: 25px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 17px;
}

.text-link {
  display: inline-block;
  margin-top: 30px;
  color: var(--cyan);
  font-size: 14px;
  font-weight: 750;
}

.technology-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.technology-list div {
  padding: 22px 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: 15px;
  font-weight: 600;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
}

.technology-list div:nth-child(odd) {
  padding-right: 25px;
}

.technology-list div:nth-child(even) {
  padding-left: 25px;
  border-left: 1px solid rgba(255, 255, 255, 0.15);
}

/* =========================
   TBBD
========================= */

.tbbd {
  padding: 120px 0;
  background: var(--light);
}

.tbbd-card {
  position: relative;
  overflow: hidden;
  padding: 70px;
  border-radius: 28px;
  background:
    linear-gradient(135deg, #0a2850 0%, #0c4770 100%);
  box-shadow: var(--shadow);
}

.tbbd-card::after {
  content: "";
  position: absolute;
  width: 350px;
  height: 350px;
  right: -100px;
  top: -120px;
  border: 70px solid rgba(25, 167, 206, 0.12);
  border-radius: 50%;
}

.tbbd-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}

.tbbd h2 {
  color: var(--white);
}

.tbbd-content > p:not(.section-label) {
  margin-top: 22px;
  color: rgba(255, 255, 255, 0.75);
  font-size: 16px;
}

.tbbd-content .button {
  margin-top: 30px;
}

/* =========================
   WHY US
========================= */

.why-us {
  padding: 120px 0;
  background: var(--white);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.value {
  padding-top: 25px;
  border-top: 2px solid var(--navy);
}

.value strong {
  color: var(--cyan);
  font-size: 13px;
}

.value h3 {
  margin-top: 30px;
  color: var(--navy);
  font-size: 20px;
}

.value p {
  margin-top: 12px;
  color: var(--muted);
  font-size: 15px;
}

/* =========================
   APPROACH
========================= */

.approach {
  padding: 110px 0;
  background: var(--light);
  text-align: center;
}

.approach-content {
  max-width: 950px;
}

.approach h2 {
  font-size: clamp(32px, 4vw, 50px);
}

.approach p:last-child {
  max-width: 700px;
  margin: 25px auto 0;
  color: var(--muted);
  font-size: 17px;
}

/* =========================
   CONTACT
========================= */

.contact {
  padding: 120px 0;
  background: var(--white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 90px;
  align-items: center;
}

.contact-grid > div:first-child > p:last-child {
  max-width: 650px;
  margin-top: 25px;
  color: var(--muted);
  font-size: 17px;
}

.contact-card {
  padding: 42px;
  border-radius: var(--radius);
  background: var(--navy);
  box-shadow: var(--shadow);
}

.contact-card h3 {
  color: var(--white);
  font-size: 23px;
}

.contact-card p {
  margin-top: 10px;
  color: rgba(255, 255, 255, 0.65);
}

.contact-card .button {
  margin-top: 28px;
}

/* =========================
   FOOTER
========================= */

.site-footer {
  padding: 70px 0 25px;
  background: #041426;
  color: rgba(255, 255, 255, 0.65);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 60px;
  align-items: center;
}

.footer-logo {
  width: 180px;
  margin-bottom: 20px;
}

.footer-grid p {
  max-width: 430px;
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--white);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  margin-top: 55px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 12px;
}

/* =========================
   RESPONSIVE
========================= */

@media (max-width: 900px) {

  .main-nav {
    display: none;
  }

  .hero {
    min-height: 700px;
  }

  .hero-content {
    padding-top: 100px;
  }

  .intro-grid,
  .technology-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 45px;
  }

  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .values-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .tbbd-card {
    padding: 50px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-links {
    flex-wrap: wrap;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

@media (max-width: 600px) {

  .container {
    width: min(var(--container), calc(100% - 32px));
  }

  .site-header {
    padding: 16px 0;
  }

  .brand-logo {
    width: 150px;
  }

  .nav-button {
    padding: 9px 14px;
    font-size: 12px;
  }

  .hero {
    min-height: 680px;
  }

  .hero-overlay {
    background:
      linear-gradient(
        90deg,
        rgba(3, 18, 38, 0.94) 0%,
        rgba(5, 27, 52, 0.82) 100%
      );
  }

  .hero h1 {
    font-size: 43px;
  }

  .hero-text {
    font-size: 16px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
    max-width: 300px;
  }

  .button {
    width: 100%;
  }

  .intro,
  .services,
  .technology,
  .tbbd,
  .why-us,
  .contact {
    padding: 80px 0;
  }

  .services-grid,
  .values-grid {
    grid-template-columns: 1fr;
  }

  .service-card {
    min-height: auto;
  }

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

  .technology-list div:nth-child(even) {
    padding-left: 0;
    border-left: 0;
  }

  .technology-list div:nth-child(odd) {
    padding-right: 0;
  }

  .tbbd-card {
    padding: 38px 28px;
    border-radius: 20px;
  }

  .footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

}