:root {
  --graphite: #101418;
  --ink: #16202a;
  --porcelain: #f3f7fa;
  --mist: #a9b7c2;
  --blue: #2f80ed;
  --teal: #2ec4b6;
  --amber: #f2c94c;
  --cloud: #f7fafc;
  --line: rgba(169, 183, 194, 0.22);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--graphite);
  color: var(--porcelain);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  line-height: 1.5;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 14px clamp(20px, 5vw, 72px);
  background: rgba(16, 20, 24, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 172px;
}

.brand img {
  display: block;
  width: 188px;
  max-width: 42vw;
  height: auto;
}

nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 3vw, 28px);
  color: var(--mist);
  font-size: 0.95rem;
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  align-items: center;
  gap: clamp(36px, 8vw, 96px);
  min-height: calc(100vh - 76px);
  padding: clamp(48px, 8vw, 112px) clamp(20px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(4rem, 12vw, 8.25rem);
  line-height: 0.88;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(2rem, 4.5vw, 4.4rem);
  line-height: 1;
  letter-spacing: 0;
}

h3 {
  margin: 16px 0 10px;
  font-size: 1.22rem;
}

.lead {
  margin: 26px 0 0;
  color: var(--amber);
  font-size: clamp(1.3rem, 3vw, 2.15rem);
  font-weight: 750;
}

.summary {
  max-width: 680px;
  margin: 20px 0 0;
  color: var(--mist);
  font-size: 1.08rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-weight: 800;
}

.button.primary {
  background: var(--porcelain);
  color: var(--graphite);
  border-color: var(--porcelain);
}

.button.secondary {
  color: var(--porcelain);
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.signal-panel {
  position: relative;
  min-height: 440px;
  border-left: 1px solid var(--line);
}

.signal-panel::before,
.signal-panel::after {
  position: absolute;
  inset: 50% auto auto 50%;
  width: min(48vw, 420px);
  height: 1px;
  content: "";
  background: linear-gradient(90deg, transparent, var(--teal), var(--blue), transparent);
  transform-origin: center;
}

.signal-panel::before {
  transform: translate(-50%, -50%) rotate(38deg);
}

.signal-panel::after {
  transform: translate(-50%, -50%) rotate(-38deg);
}

.core-node {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  width: 128px;
  height: 128px;
  place-items: center;
  color: var(--porcelain);
  font-size: 2rem;
  font-weight: 900;
  border: 2px solid var(--teal);
  border-radius: 8px;
  background: #151d24;
  box-shadow: 0 0 0 1px rgba(47, 128, 237, 0.45) inset;
  transform: translate(-50%, -50%) rotate(45deg);
}

.core-node span {
  display: inline-block;
  transform: rotate(-45deg);
}

.node {
  position: absolute;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--porcelain);
  box-shadow: 0 0 0 7px rgba(47, 128, 237, 0.14);
}

.node-a {
  top: 22%;
  left: 26%;
  background: var(--teal);
}

.node-b {
  top: 22%;
  right: 16%;
  background: var(--blue);
}

.node-c {
  bottom: 20%;
  left: 18%;
}

.node-d {
  right: 20%;
  bottom: 18%;
  background: var(--amber);
}

.section {
  padding: clamp(56px, 9vw, 112px) clamp(20px, 5vw, 72px);
}

.section-heading {
  margin-bottom: 34px;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.project-card {
  min-height: 240px;
  padding: 26px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.project-card p,
.text-block p,
.repo-band p {
  color: var(--mist);
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  color: var(--graphite);
  background: var(--teal);
  border-radius: 4px;
  font-size: 0.78rem;
  font-weight: 900;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: clamp(28px, 6vw, 80px);
  background: var(--cloud);
  color: var(--ink);
}

.split .eyebrow {
  color: var(--blue);
}

.text-block {
  max-width: 720px;
  font-size: 1.08rem;
}

.repo-band {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  border-top: 1px solid var(--line);
}

.repo-band div {
  max-width: 760px;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 28px clamp(20px, 5vw, 72px);
  color: var(--mist);
  border-top: 1px solid var(--line);
}

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

  .hero {
    min-height: auto;
  }

  .signal-panel {
    min-height: 320px;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

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

  .repo-band {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    width: 100%;
    justify-content: space-between;
    font-size: 0.88rem;
  }

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

  .signal-panel {
    min-height: 260px;
  }

  .core-node {
    width: 96px;
    height: 96px;
    font-size: 1.45rem;
  }

  footer {
    flex-direction: column;
  }
}