:root {
  color-scheme: dark;
  --bg: #03030a;
  --surface: #0c1020;
  --surface-2: #101828;
  --border: rgba(85, 180, 249, 0.16);
  --border-hi: rgba(85, 180, 249, 0.34);
  --cyan: #55b4f9;
  --purple: #a170d9;
  --text: #e9eef7;
  --muted: rgba(233, 238, 247, 0.64);
  --container: 1120px;
  --radius: 14px;
  --radius-sm: 8px;
  font-family: "Overpass", -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 60% 40% at 20% 10%, rgba(85, 180, 249, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 50% 35% at 80% 80%, rgba(161, 112, 217, 0.08) 0%, transparent 70%),
    var(--bg);
  color: var(--text);
  font-family: "Overpass", -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 300;
  line-height: 1.7;
}

a {
  color: var(--cyan);
}

.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: min(100%, var(--container));
  margin: 0 auto;
  padding: 10px clamp(20px, 5vw, 48px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.05em;
  text-decoration: none;
  text-transform: uppercase;
}

.brand img {
  width: 58px;
  height: auto;
}

.nav-link {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-decoration: none;
  text-transform: uppercase;
}

main {
  width: min(100%, var(--container));
  margin: 0 auto;
  padding: 28px clamp(20px, 5vw, 48px) 72px;
}

.hero {
  min-height: calc(100vh - 140px);
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  gap: clamp(28px, 6vw, 68px);
  align-items: center;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 800;
  line-height: 1.12;
}

h1 {
  max-width: 760px;
  font-size: clamp(38px, 7vw, 78px);
}

h1 span {
  background: linear-gradient(130deg, var(--cyan), var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

h2 {
  font-size: clamp(24px, 4vw, 38px);
}

h3 {
  font-size: 18px;
}

.lead {
  max-width: 720px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 2.2vw, 22px);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  border: 1px solid var(--border-hi);
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  color: var(--text);
  font-weight: 800;
  text-align: center;
  text-decoration: none;
}

.button.primary {
  border-color: transparent;
  background: linear-gradient(130deg, var(--cyan), #3fa0f0);
  color: #fff;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.04);
}

.button.disabled {
  cursor: not-allowed;
  opacity: 0.58;
}

.summary,
.notice article,
.hardware,
.terms {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.02));
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.26);
}

.summary {
  padding: 24px;
}

.summary ul {
  margin: 18px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.notice,
.hardware,
.terms {
  margin-top: 26px;
}

.notice > h2 {
  margin-bottom: 18px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.notice article {
  padding: 18px;
}

.notice p,
.hardware p,
.terms p {
  margin: 10px 0 0;
  color: var(--muted);
}

.notice a {
  display: inline-block;
  margin-top: 12px;
  font-weight: 700;
  text-decoration: none;
}

.hardware {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px;
}

.hardware > div {
  max-width: 720px;
}

.terms {
  padding: 24px;
}

@media (max-width: 900px) {
  .hero,
  .grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 30px;
  }

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

@media (max-width: 560px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

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