style.css

:root {
  --background: #0e1020;
  --surface: #171a2f;
  --surface-soft: #20243d;
  --text: #f7f8ff;
  --muted: #bac0d9;
  --accent: #7c6cff;
  --accent-light: #b6aeff;
  --border: rgba(255, 255, 255, 0.12);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  --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;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(124, 108, 255, 0.35), transparent 34rem),
    radial-gradient(circle at bottom right, rgba(54, 216, 216, 0.18), transparent 28rem),
    var(--background);
  line-height: 1.6;
}

a {
  color: var(--accent-light);
  text-decoration: none;
}

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

code {
  display: inline-block;
  max-width: 100%;
  margin-top: 0.4rem;
  padding: 0.35rem 0.55rem;
  overflow-x: auto;
  color: #fff;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.9rem;
}

.hero {
  min-height: 86vh;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

.nav {
  width: min(1120px, 100%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.logo {
  color: var(--text);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.75rem 1.2rem;
  font-size: 0.95rem;
}

.nav-links a {
  color: var(--muted);
}

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

.hero-content {
  width: min(1120px, 100%);
  margin: auto;
  padding: 5rem 0 7rem;
}

.eyebrow,
.section-label {
  margin: 0 0 0.75rem;
  color: var(--accent-light);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 850px;
  margin-bottom: 1.25rem;
  font-size: clamp(3.2rem, 9vw, 7rem);
  line-height: 0.92;
  letter-spacing: -0.07em;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.045em;
}

h3 {
  margin-bottom: 0.65rem;
  font-size: 1.2rem;
  line-height: 1.25;
}

.hero-text {
  max-width: 700px;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.8rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-weight: 800;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

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

.button.primary {
  color: #111327;
  background: var(--accent-light);
}

.button.secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.08);
}

main {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.section {
  margin-bottom: 1.5rem;
  padding: clamp(1.35rem, 4vw, 3rem);
  background: rgba(23, 26, 47, 0.78);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.intro,
.split,
.final-step {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 2rem;
  align-items: start;
}

.intro p:last-child,
.notice p,
.card p,
.option-card p,
.footer p {
  color: var(--muted);
}

.card-grid,
.option-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

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

.card,
.option-card,
.notice {
  padding: 1.25rem;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: 20px;
}

.card-number {
  display: inline-flex;
  width: 2.25rem;
  height: 2.25rem;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  color: var(--accent-light);
  background: rgba(124, 108, 255, 0.14);
  border: 1px solid rgba(182, 174, 255, 0.28);
  border-radius: 50%;
  font-size: 0.82rem;
  font-weight: 900;
}

.steps {
  display: grid;
  gap: 1rem;
  margin: 1rem 0 0;
  padding-left: 1.25rem;
}

.steps li {
  padding-left: 0.35rem;
}

.steps li::marker {
  color: var(--accent-light);
  font-weight: 900;
}

.steps.compact {
  gap: 0.85rem;
}

.notice {
  position: sticky;
  top: 1rem;
}

.code-stack {
  display: grid;
  gap: 0.5rem;
}

.final-step {
  grid-template-columns: 1fr;
  background: linear-gradient(135deg, rgba(124, 108, 255, 0.28), rgba(23, 26, 47, 0.9));
}

.footer {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2rem 0 3rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
}

@media (max-width: 820px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero-content {
    padding: 4rem 0;
  }

  .intro,
  .split,
  .card-grid,
  .option-grid {
    grid-template-columns: 1fr;
  }

  .notice {
    position: static;
  }

  .footer {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .hero {
    min-height: auto;
  }

  h1 {
    font-size: 3.5rem;
  }

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