:root {
  --ink: #111827;
  --muted: #5f6673;
  --line: #d9dde5;
  --paper: #f8f9fb;
  --white: #ffffff;
  --violet: #7a4df3;
  --cyan: #2bb8d8;
  --green: #81b85a;
  --deep: #111827;
  --deep-2: #182234;
  --shadow: 0 24px 80px rgba(17, 24, 39, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

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

a {
  color: inherit;
}

.site-header {
  position: fixed;
  z-index: 20;
  top: 18px;
  left: 50%;
  width: min(1160px, calc(100% - 32px));
  min-height: 64px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 18px 14px 22px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(18px);
  box-shadow: 0 14px 40px rgba(17, 24, 39, 0.1);
}

.brand img {
  width: 132px;
  height: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: #2d3543;
  font-size: 0.92rem;
  font-weight: 650;
}

.nav a {
  text-decoration: none;
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--violet);
}

.nav-contact {
  padding: 10px 15px;
  border: 1px solid var(--line);
  background: var(--white);
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: end;
  padding: 132px max(24px, calc((100vw - 1160px) / 2)) 72px;
  overflow: hidden;
  color: var(--white);
}

.hero-media {
  position: absolute;
  inset: 0;
  background: var(--deep);
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(17, 24, 39, 0.86) 0%, rgba(17, 24, 39, 0.48) 48%, rgba(17, 24, 39, 0.14) 100%),
    linear-gradient(0deg, rgba(17, 24, 39, 0.78) 0%, rgba(17, 24, 39, 0.02) 48%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(720px, 100%);
}

.eyebrow,
.section-kicker {
  margin: 0 0 16px;
  color: var(--cyan);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(4.8rem, 13vw, 11rem);
  line-height: 0.82;
  letter-spacing: 0;
}

.hero-tagline {
  margin: 18px 0 0;
  font-size: clamp(1.45rem, 3.2vw, 2.6rem);
  font-weight: 750;
}

.hero-copy {
  width: min(660px, 100%);
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.86);
  font-size: clamp(1.05rem, 1.8vw, 1.32rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 13px 18px;
  text-decoration: none;
  font-weight: 750;
}

.button.primary {
  background: var(--white);
  color: var(--deep);
}

.button.secondary {
  border: 1px solid rgba(255, 255, 255, 0.42);
  color: var(--white);
}

.section {
  padding: 104px max(24px, calc((100vw - 1160px) / 2));
}

.intro-grid,
.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: 64px;
  align-items: start;
}

h2 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: clamp(2.2rem, 4.4vw, 4.2rem);
  line-height: 1.02;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.12rem;
  line-height: 1.2;
}

.intro-grid p,
.section-heading p,
.split-copy p,
.contact p {
  color: var(--muted);
  font-size: 1.08rem;
}

.principles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: 70px;
  background: var(--line);
  border: 1px solid var(--line);
}

.principles article {
  min-height: 260px;
  padding: 28px;
  background: var(--white);
}

.principles span {
  display: block;
  margin-bottom: 54px;
  color: var(--violet);
  font-weight: 800;
}

.principles p,
.application-grid p,
.tech-columns p,
.site-footer p {
  color: var(--muted);
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(360px, 0.88fr);
  align-items: stretch;
  background: var(--white);
}

.split-media {
  min-height: 620px;
}

.split-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.split-copy {
  align-self: center;
  padding: 72px max(24px, calc((100vw - 1160px) / 2)) 72px 64px;
}

.check-list {
  display: grid;
  gap: 14px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 26px;
  color: #273142;
  font-weight: 650;
}

.check-list li::before {
  content: "";
  position: absolute;
  top: 0.65em;
  left: 0;
  width: 10px;
  height: 10px;
  background: var(--green);
}

.applications {
  background: #eef2f6;
}

.application-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
  margin-top: 56px;
}

.application-grid article {
  background: var(--white);
  box-shadow: 0 1px 0 rgba(17, 24, 39, 0.06);
}

.application-grid img {
  width: 100%;
  aspect-ratio: 1.12 / 1;
  object-fit: cover;
}

.application-grid h3,
.application-grid p {
  padding-inline: 22px;
}

.application-grid h3 {
  margin-top: 22px;
}

.application-grid p {
  margin-bottom: 24px;
}

.band {
  padding: 108px max(24px, calc((100vw - 1160px) / 2));
  color: var(--white);
  background:
    linear-gradient(120deg, rgba(17, 24, 39, 0.96), rgba(24, 34, 52, 0.92)),
    url("images/rotor-detail.jpg") center / cover;
}

.band h2 {
  width: min(900px, 100%);
}

.tech-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: 54px;
  background: rgba(255, 255, 255, 0.18);
}

.tech-columns div {
  min-height: 220px;
  padding: 30px;
  background: rgba(255, 255, 255, 0.08);
}

.tech-columns p {
  color: rgba(255, 255, 255, 0.72);
}

.team {
  background: var(--white);
}

.contact {
  padding: 78px max(24px, calc((100vw - 1160px) / 2));
  color: var(--white);
  background: linear-gradient(100deg, var(--deep), #263449 72%, #234b56);
}

.contact-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: center;
}

.contact h2 {
  margin-bottom: 12px;
  font-size: clamp(2rem, 4vw, 3.5rem);
}

.contact p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.74);
}

.mail-link {
  display: inline-flex;
  min-height: 58px;
  align-items: center;
  justify-content: center;
  padding: 16px 22px;
  background: var(--white);
  color: var(--deep);
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 800;
  white-space: nowrap;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  padding: 42px max(24px, calc((100vw - 1160px) / 2));
  background: var(--white);
  border-top: 1px solid var(--line);
}

.site-footer img {
  width: 112px;
}

.site-footer p {
  margin: 12px 0 0;
  font-size: 0.92rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: flex-end;
  color: var(--muted);
  font-size: 0.94rem;
}

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

.social-link {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--deep);
}

.social-link:hover,
.social-link:focus-visible {
  color: var(--violet);
  border-color: rgba(122, 77, 243, 0.42);
}

.social-link svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.legal-page {
  padding: 132px max(24px, calc((100vw - 880px) / 2)) 80px;
  background: var(--white);
}

.legal-page h1 {
  margin-bottom: 28px;
  color: var(--ink);
  font-size: clamp(2.6rem, 8vw, 5.5rem);
}

.legal-page h2 {
  margin-top: 42px;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
}

.legal-page p,
.legal-page li {
  color: var(--muted);
}

.legal-page a {
  color: var(--violet);
  font-weight: 700;
}

@media (max-width: 980px) {
  .site-header {
    position: absolute;
    align-items: flex-start;
  }

  .nav {
    max-width: 430px;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 12px 18px;
  }

  .intro-grid,
  .section-heading,
  .split-section,
  .contact-inner {
    grid-template-columns: 1fr;
  }

  .principles,
  .application-grid,
  .tech-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split-media {
    min-height: 420px;
  }

  .split-copy {
    padding: 64px 24px;
  }
}

@media (max-width: 680px) {
  .site-header {
    top: 12px;
    width: calc(100% - 24px);
    min-height: 56px;
    padding: 12px;
  }

  .brand img {
    width: 104px;
  }

  .nav a:not(.nav-contact) {
    display: none;
  }

  .nav-contact {
    padding: 9px 12px;
  }

  .hero {
    min-height: 88vh;
    padding-top: 116px;
    padding-bottom: 44px;
  }

  .hero-media img {
    object-position: 58% center;
  }

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

  .section {
    padding-block: 72px;
  }

  .intro-grid,
  .section-heading {
    gap: 22px;
  }

  .principles,
  .application-grid,
  .tech-columns {
    grid-template-columns: 1fr;
  }

  .principles article {
    min-height: 210px;
  }

  .principles span {
    margin-bottom: 32px;
  }

  .contact {
    padding-block: 62px;
  }

  .mail-link {
    width: 100%;
    white-space: normal;
  }

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

  .site-footer nav {
    justify-content: flex-start;
  }
}