:root {
  color-scheme: dark;
  --bg: #08111c;
  --bg-soft: #0d1927;
  --panel: #102237;
  --panel-strong: #142b43;
  --text: #f3f7fb;
  --muted: #b4c2d2;
  --blue: #38bdf8;
  --cyan: #5eead4;
  --yellow: #facc15;
  --line: rgba(255, 255, 255, 0.12);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.32);
  --radius: 24px;
  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 85% 2%, rgba(56, 189, 248, 0.15), transparent 24rem),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
}

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

a {
  color: inherit;
}

.shell {
  width: min(1160px, calc(100% - 40px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--text);
  color: var(--bg);
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.hero {
  min-height: 100vh;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(145deg, rgba(8, 17, 28, 0.66), rgba(8, 17, 28, 0.95)),
    radial-gradient(circle at 78% 45%, rgba(94, 234, 212, 0.17), transparent 24rem);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 750;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: #03131d;
  font-weight: 900;
}

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

.nav-links a,
.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

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

.hero-content {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 64px;
  align-items: center;
  padding-block: 82px 110px;
}

.hero-copy {
  max-width: 920px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 10px;
  color: var(--cyan);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(2.7rem, 5vw, 5.5rem);
  line-height: 0.99;
  letter-spacing: -0.055em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(2rem, 4vw, 3.7rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

h3 {
  margin-bottom: 18px;
  font-size: clamp(1.65rem, 2.8vw, 2.5rem);
  line-height: 1.13;
  letter-spacing: -0.03em;
}

h4 {
  margin: 28px 0 8px;
  color: var(--yellow);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.lead {
  max-width: 660px;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: 1.16rem;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 780;
  text-decoration: none;
  transition:
    transform 160ms ease,
    border-color 160ms ease;
}

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

.button-primary {
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: #03131d;
}

.button-secondary {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.download-note {
  max-width: 620px;
  margin-top: 16px;
  color: #8899aa;
  font-size: 0.82rem;
}

.hero-visual {
  position: relative;
  width: 100%;
  margin: 0;
}

.hero-visual::before {
  position: absolute;
  inset: -14px;
  z-index: -1;
  border: 1px solid rgba(94, 234, 212, 0.2);
  border-radius: calc(var(--radius) + 10px);
  content: "";
  transform: rotate(2.5deg);
}

.hero-visual img,
.activity-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 1366 / 768;
  object-fit: contain;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.image-link {
  display: block;
  border-radius: var(--radius);
  cursor: zoom-in;
  outline-offset: 6px;
  transition: transform 180ms ease;
}

.image-link:hover {
  transform: translateY(-3px);
}

.image-hint {
  margin: 12px 4px 0;
  color: #93a5b7;
  font-size: 0.84rem;
  text-align: right;
}

.hero-visual figcaption {
  margin-top: 12px;
  color: #8899aa;
  font-size: 0.82rem;
  text-align: right;
}

.intro {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 80px;
  padding-block: 120px;
}

.intro-copy {
  color: var(--muted);
  font-size: 1.12rem;
}

.activities {
  padding-block: 110px;
  border-block: 1px solid var(--line);
  background: var(--bg-soft);
}

.activity-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "content"
    "media";
  gap: 34px;
  align-items: center;
  padding-block: 82px;
  border-bottom: 1px solid var(--line);
}

.activity-media {
  grid-area: media;
}

.activity-card:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.activity-content {
  grid-area: content;
  max-width: 920px;
  color: var(--muted);
  font-size: 1.05rem;
}

.activity-content h3 {
  color: var(--text);
}

.activity-number {
  display: inline-block;
  margin-bottom: 20px;
  color: var(--blue);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 800;
}

.privacy {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 48px;
  align-items: center;
  padding-block: 110px;
}

.privacy-icon {
  display: grid;
  width: 130px;
  height: 130px;
  place-items: center;
  border: 1px solid rgba(94, 234, 212, 0.28);
  border-radius: 50%;
  background: rgba(94, 234, 212, 0.07);
  color: var(--cyan);
  font-size: 4.2rem;
}

.privacy p:last-child {
  max-width: 780px;
  color: var(--muted);
  font-size: 1.08rem;
}

.footer {
  padding-block: 90px 46px;
  border-top: 1px solid var(--line);
  background: #050b12;
}

.footer-heading {
  display: grid;
  grid-template-columns: 1fr 0.7fr;
  gap: 70px;
  align-items: start;
}

.footer-links {
  display: grid;
  gap: 12px;
  justify-items: start;
}

.logos {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  align-items: center;
  margin-block: 58px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.logos img {
  max-width: 100%;
  max-height: 92px;
  margin-inline: auto;
  object-fit: contain;
}

.author-credit {
  margin-bottom: 6px;
  color: var(--text);
  font-weight: 700;
}

.footer-note {
  margin-bottom: 0;
  color: #8190a0;
  font-size: 0.88rem;
}

@media (max-width: 960px) {
  .hero {
    min-height: auto;
  }

  .hero-content,
  .intro,
  .footer-heading {
    grid-template-columns: 1fr;
  }

  .hero-content {
    gap: 60px;
  }

  .activity-card {
    gap: 30px;
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 28px, 1160px);
  }

  .nav-links {
    display: none;
  }

  .hero-content {
    padding-block: 58px 72px;
  }

  h1 {
    font-size: clamp(2.55rem, 13vw, 4rem);
  }

  .intro,
  .activities,
  .privacy {
    padding-block: 76px;
  }

  .activity-card {
    padding-block: 62px;
  }

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

  .privacy-icon {
    width: 96px;
    height: 96px;
    font-size: 3rem;
  }

  .logos {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}