:root {
  color-scheme: dark;

  --bg: #040a0e;
  --panel: rgba(8, 20, 26, 0.78);
  --panel-strong: #081319;
  --line: rgba(143, 196, 210, 0.16);

  --text: #edf4f7;
  --muted: #91a5ad;

  --mint: #82e7c5;
  --blue: #4b9fff;
  --violet: #896cff;

  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(
      circle at 70% 10%,
      rgba(55, 94, 170, 0.15),
      transparent 35%
    ),
    var(--bg);
  color: var(--text);
}

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

.site-header {
  position: fixed;
  z-index: 50;
  top: 0;
  left: 0;
  right: 0;

  display: flex;
  align-items: center;
  justify-content: space-between;

  min-height: 68px;
  padding: 0 4vw;

  border-bottom: 1px solid var(--line);

  background:
    rgba(4, 10, 14, 0.82);

  backdrop-filter: blur(18px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;

  color: var(--mint);

  font-weight: 800;
  letter-spacing: 0.12em;
}

.brand img {
  width: 34px;
  height: 34px;
  object-fit: contain;
}

nav {
  display: flex;
  gap: 1.6rem;

  color: var(--muted);

  font-size: 0.82rem;
  font-weight: 650;
}

nav a:hover {
  color: var(--text);
}

.hero {
  position: relative;

  min-height: 100vh;

  display: flex;
  align-items: center;

  padding: 130px 7vw 90px;

  overflow: hidden;

  background:
    url("./assets/observatory-hero.webp")
    center / cover no-repeat;
}

.hero-overlay {
  position: absolute;
  inset: 0;

  background:
    linear-gradient(
      90deg,
      rgba(3, 9, 13, 0.98) 0%,
      rgba(3, 9, 13, 0.90) 36%,
      rgba(3, 9, 13, 0.38) 72%,
      rgba(3, 9, 13, 0.34) 100%
    ),
    linear-gradient(
      0deg,
      var(--bg) 0%,
      transparent 34%
    );
}

.hero-content {
  position: relative;
  z-index: 2;

  max-width: 780px;
}

.eyebrow,
.section-label {
  color: var(--mint);

  font-size: 0.72rem;
  font-weight: 800;

  letter-spacing: 0.16em;
}

.hero h1 {
  margin:
    1.1rem 0
    1.5rem;

  font-size:
    clamp(3.5rem, 7.7vw, 7.7rem);

  line-height: 0.91;
  letter-spacing: -0.065em;
}

.hero h1 span {
  background:
    linear-gradient(
      90deg,
      var(--blue),
      var(--violet),
      var(--mint)
    );

  -webkit-background-clip: text;
  background-clip: text;

  color: transparent;
}

.hero-copy {
  max-width: 690px;

  color: #adbdc4;

  font-size:
    clamp(1rem, 1.6vw, 1.3rem);

  line-height: 1.65;
}

.hero-actions,
.release-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;

  margin-top: 2.2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  min-height: 46px;

  padding:
    0.7rem
    1.1rem;

  border:
    1px solid
    rgba(154, 199, 214, 0.22);

  border-radius: 8px;

  background:
    rgba(8, 19, 25, 0.72);

  font-size: 0.83rem;
  font-weight: 750;
}

.button:hover {
  border-color:
    rgba(130, 231, 197, 0.55);
}

.button.primary {
  border-color:
    rgba(130, 231, 197, 0.45);

  background:
    rgba(130, 231, 197, 0.10);

  color: var(--mint);
}

.release-chip {
  display: inline-flex;
  gap: 0.75rem;

  margin-top: 2.6rem;

  padding:
    0.55rem
    0.8rem;

  border:
    1px solid
    rgba(130, 231, 197, 0.20);

  border-radius: 999px;

  background:
    rgba(4, 12, 16, 0.62);

  color: var(--muted);

  font-size: 0.75rem;
}

.release-chip strong {
  color: var(--mint);
}

.intro,
.principles,
.verification {
  max-width: 1180px;

  margin: 0 auto;

  padding:
    110px
    6vw;
}

.intro {
  text-align: center;
}

.intro h2,
.principles h2,
.verification h2 {
  margin:
    0.7rem 0
    1rem;

  font-size:
    clamp(2rem, 4vw, 4rem);

  letter-spacing: -0.045em;
}

.intro p:last-child {
  max-width: 700px;
  margin:
    0 auto;

  color: var(--muted);

  line-height: 1.7;
}

.workflow-grid {
  max-width: 1220px;

  margin: 0 auto;

  padding:
    0
    4vw
    90px;
}

.workflow {
  display: grid;
  grid-template-columns:
    minmax(0, 1.08fr)
    minmax(320px, 0.92fr);

  gap: 4rem;

  align-items: center;

  padding:
    80px
    0;

  border-top:
    1px solid
    var(--line);
}

.workflow.reverse
  .workflow-image {
  order: 2;
}

.workflow-image {
  position: relative;

  overflow: hidden;

  min-height: 420px;

  border:
    1px solid
    var(--line);

  border-radius: 18px;

  background:
    var(--panel);
}

.workflow-image img {
  width: 100%;
  height: 100%;

  min-height: 420px;

  object-fit: cover;
}

.workflow-content h2 {
  margin:
    0.65rem 0
    1rem;

  font-size:
    clamp(2.1rem, 4vw, 4rem);

  letter-spacing: -0.05em;
}

.workflow-content p {
  color: var(--muted);

  line-height: 1.7;
}

.workflow-content ul {
  padding-left: 1.2rem;

  color: #bdcbd0;

  line-height: 1.85;
}

.text-link {
  display: inline-block;

  margin-top: 1rem;

  color: var(--mint);

  font-weight: 750;
}

.principles {
  border-top:
    1px solid
    var(--line);
}

.principle-grid {
  display: grid;

  grid-template-columns:
    repeat(4, 1fr);

  gap: 1rem;

  margin-top: 3rem;
}

.principle-grid article {
  min-height: 190px;

  padding: 1.4rem;

  border:
    1px solid
    var(--line);

  border-radius: 12px;

  background:
    linear-gradient(
      145deg,
      rgba(12, 31, 38, 0.8),
      rgba(5, 13, 18, 0.72)
    );
}

.principle-grid strong {
  color: var(--mint);

  font-size: 0.82rem;
}

.principle-grid p {
  color: var(--muted);

  line-height: 1.6;
}

.verification {
  border-top:
    1px solid
    var(--line);
}

.stats {
  display: grid;

  grid-template-columns:
    repeat(4, 1fr);

  gap: 0.8rem;

  margin-top: 2.8rem;
}

.stats article {
  display: flex;
  flex-direction: column;

  padding: 1.25rem;

  border:
    1px solid
    var(--line);

  border-radius: 10px;

  background:
    var(--panel);
}

.stats strong {
  color: var(--mint);

  font-size: 1.8rem;
}

.stats span {
  margin-top: 0.35rem;

  color: var(--muted);

  font-size: 0.78rem;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;

  padding:
    30px
    6vw;

  border-top:
    1px solid
    var(--line);

  color: #697e87;

  font-size: 0.75rem;
}

@media (max-width: 900px) {
  nav {
    display: none;
  }

  .hero {
    padding-left: 5vw;
    padding-right: 5vw;
  }

  .workflow,
  .workflow.reverse {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .workflow.reverse
    .workflow-image {
    order: 0;
  }

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

@media (max-width: 560px) {
  .hero {
    min-height: 92vh;
  }

  .hero h1 {
    font-size: 3.4rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .principle-grid,
  .stats {
    grid-template-columns: 1fr;
  }

  footer {
    flex-direction: column;
  }
}

.local-note {
  margin: 1rem 0 0;

  color: #718790;

  font-size: 0.75rem;
  line-height: 1.5;
}