:root {
  --bg: #07111f;
  --bg-soft: #0d1a2c;
  --panel: #101f34;
  --panel-2: #13243b;
  --text: #f3f7fb;
  --muted: #9fb0c6;
  --line: rgba(177, 204, 230, 0.16);
  --cyan: #38d7ff;
  --green: #70f0ba;
  --amber: #f7c873;
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(56, 215, 255, 0.13), transparent 34rem),
    radial-gradient(circle at 85% 10%, rgba(112, 240, 186, 0.10), transparent 32rem),
    linear-gradient(180deg, #07111f 0%, #091522 42%, #06101b 100%);
  min-height: 100vh;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1rem clamp(1rem, 4vw, 4rem);
  background: rgba(7, 17, 31, 0.78);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  display: grid;
  width: 2.15rem;
  height: 2.15rem;
  place-items: center;
  border: 1px solid rgba(56, 215, 255, 0.45);
  border-radius: 0.45rem;
  background: linear-gradient(145deg, rgba(56, 215, 255, 0.2), rgba(112, 240, 186, 0.1));
  color: var(--cyan);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}

.site-nav a:hover {
  color: var(--white);
}

.nav-toggle {
  display: none;
  width: 2.4rem;
  height: 2.4rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: transparent;
  color: var(--text);
}

.nav-toggle span {
  display: block;
  width: 1.1rem;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(20rem, 0.92fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
  min-height: calc(100vh - 4.25rem);
  padding: clamp(3rem, 7vw, 7rem) clamp(1rem, 4vw, 4rem) 3rem;
}

.eyebrow {
  margin: 0 0 0.85rem;
  color: var(--green);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 58rem;
  margin-bottom: 1.2rem;
  font-size: clamp(2.35rem, 5.6vw, 5.2rem);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(1.8rem, 3.2vw, 3.15rem);
  line-height: 1.08;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 0.6rem;
  font-size: 1.05rem;
}

.lead {
  max-width: 48rem;
  color: #c5d3e3;
  font-size: clamp(1rem, 1.7vw, 1.2rem);
  line-height: 1.72;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.8rem;
  padding: 0.85rem 1.1rem;
  border-radius: 0.45rem;
  font-weight: 800;
}

.button.primary {
  background: var(--cyan);
  color: #04111d;
}

.button.ghost {
  border: 1px solid var(--line);
  color: var(--text);
}

.hero-visual {
  position: relative;
  min-height: 30rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background:
    linear-gradient(135deg, rgba(56, 215, 255, 0.09), rgba(112, 240, 186, 0.04)),
    var(--panel);
  box-shadow: var(--shadow);
}

.radar-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(circle, black, transparent 74%);
}

.propeller {
  position: absolute;
  inset: 50% auto auto 50%;
  width: 13rem;
  height: 13rem;
  transform: translate(-50%, -50%);
  animation: slow-spin 16s linear infinite;
}

.propeller span {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 3.1rem;
  height: 7.3rem;
  border-radius: 50% 50% 0.65rem 0.65rem;
  background: linear-gradient(180deg, rgba(56, 215, 255, 0.95), rgba(112, 240, 186, 0.3));
  transform-origin: 50% 100%;
}

.propeller span:nth-child(1) { transform: translate(-50%, -100%) rotate(0deg); }
.propeller span:nth-child(2) { transform: translate(-50%, -100%) rotate(120deg); }
.propeller span:nth-child(3) { transform: translate(-50%, -100%) rotate(240deg); }

.propeller i {
  position: absolute;
  inset: 50% auto auto 50%;
  width: 4.2rem;
  height: 4.2rem;
  transform: translate(-50%, -50%);
  border: 0.65rem solid rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  background: #07111f;
}

.telemetry {
  position: absolute;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  background: rgba(7, 17, 31, 0.72);
  color: #d9e8f7;
  font-size: 0.86rem;
  font-weight: 700;
}

.telemetry-a { top: 16%; left: 9%; }
.telemetry-b { right: 10%; top: 27%; }
.telemetry-c { bottom: 16%; left: 22%; }

@keyframes slow-spin {
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.stats-strip,
.section {
  width: min(1160px, calc(100% - 2rem));
  margin-inline: auto;
}

.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: var(--line);
}

.stats-strip div {
  padding: 1.1rem;
  background: rgba(13, 26, 44, 0.88);
}

.stats-strip strong {
  display: block;
  color: var(--cyan);
  font-size: 1.65rem;
}

.stats-strip span {
  color: var(--muted);
  font-size: 0.9rem;
}

.section {
  padding: clamp(4rem, 8vw, 7rem) 0;
  border-bottom: 1px solid var(--line);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 620ms ease, transform 620ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.split {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(2rem, 6vw, 5rem);
}

.text-stack {
  color: #c7d5e4;
  font-size: 1rem;
  line-height: 1.75;
}

.text-stack p:last-child {
  margin-bottom: 0;
}

.section-heading {
  max-width: 780px;
  margin-bottom: 2rem;
}

.cards {
  display: grid;
  gap: 1rem;
}

.cards.three {
  grid-template-columns: repeat(3, 1fr);
}

.cards.four {
  grid-template-columns: repeat(4, 1fr);
}

.card {
  min-height: 13rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: linear-gradient(180deg, rgba(19, 36, 59, 0.95), rgba(13, 26, 44, 0.95));
}

.card-icon,
.metric strong {
  display: inline-flex;
  margin-bottom: 1rem;
  color: var(--cyan);
  font-weight: 800;
}

.card p {
  color: var(--muted);
  line-height: 1.65;
}

.flow {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.75rem;
}

.flow-step {
  position: relative;
  min-height: 10rem;
  padding: 1.1rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: rgba(16, 31, 52, 0.8);
}

.flow-step::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -0.75rem;
  width: 0.75rem;
  height: 1px;
  background: var(--cyan);
}

.flow-step:last-child::after {
  display: none;
}

.flow-step b {
  display: block;
  margin-bottom: 0.7rem;
}

.flow-step span {
  color: var(--muted);
  line-height: 1.55;
}

.architecture-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: stretch;
}

.diagram-panel {
  position: relative;
  min-height: 25rem;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    rgba(16, 31, 52, 0.72);
  background-size: 28px 28px;
}

.node {
  position: absolute;
  width: 12rem;
  padding: 0.8rem;
  border: 1px solid rgba(56, 215, 255, 0.35);
  border-radius: 0.5rem;
  background: rgba(7, 17, 31, 0.86);
  color: #eaf5ff;
  font-weight: 800;
  text-align: center;
}

.wind { left: 7%; top: 12%; }
.prop { left: 48%; top: 18%; transform: translateX(-50%); }
.motor { right: 7%; top: 42%; }
.esc { left: 18%; bottom: 18%; }
.battery { right: 9%; bottom: 12%; }

.timeline {
  display: grid;
  gap: 1rem;
  padding: 0;
  list-style: none;
}

.timeline li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: rgba(16, 31, 52, 0.78);
}

.timeline span {
  color: var(--amber);
  font-weight: 800;
}

.timeline p {
  margin-bottom: 0;
  color: var(--muted);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.team-grid article {
  min-height: 6rem;
  display: grid;
  place-items: center;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  background: var(--panel-2);
  color: #eaf5ff;
  font-weight: 800;
  text-align: center;
}

.reference-list {
  display: grid;
  gap: 0.8rem;
}

.reference-list a {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: rgba(16, 31, 52, 0.74);
  color: #d9e8f7;
}

.reference-list a:hover {
  border-color: rgba(56, 215, 255, 0.5);
  color: var(--white);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem clamp(1rem, 4vw, 4rem);
  color: var(--muted);
}

.site-footer p {
  margin: 0;
}

@media (max-width: 980px) {
  .hero,
  .split,
  .architecture-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .cards.three,
  .cards.four,
  .flow,
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: calc(100% + 0.6rem);
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 0.8rem;
    border: 1px solid var(--line);
    border-radius: 0.65rem;
    background: rgba(7, 17, 31, 0.98);
  }

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

  .site-nav a {
    padding: 0.75rem;
  }

  .hero-visual {
    min-height: 22rem;
  }

  .stats-strip,
  .cards.three,
  .cards.four,
  .flow,
  .team-grid {
    grid-template-columns: 1fr;
  }

  .flow-step {
    min-height: auto;
  }

  .flow-step::after {
    left: 50%;
    right: auto;
    top: auto;
    bottom: -0.75rem;
    width: 1px;
    height: 0.75rem;
  }

  .node {
    position: static;
    width: auto;
    transform: none;
    margin: 0.8rem;
  }

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