:root {
  --color-bg: #f3f7f9;
  --color-surface: #ffffff;
  --color-ink: #0e2433;
  --color-muted: #4a6270;
  --color-accent: #0a7ea4;
  --color-accent-strong: #085f7b;
  --color-line: #d6e2e8;
  --radius-lg: 20px;
  --radius-md: 14px;
  --shadow-soft: 0 10px 30px rgba(14, 36, 51, 0.08);
  --max-width: 1240px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Space Grotesk", sans-serif;
  color: var(--color-ink);
  background: linear-gradient(180deg, #f9fcfe 0%, #eff5f8 45%, #f8fbfd 100%);
  line-height: 1.55;
}

.bg-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(circle at 15% 12%, rgba(10, 126, 164, 0.14), transparent 32%),
    radial-gradient(circle at 82% 8%, rgba(14, 36, 51, 0.08), transparent 36%),
    linear-gradient(rgba(255, 255, 255, 0.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.4) 1px, transparent 1px);
  background-size: auto, auto, 36px 36px, 36px 36px;
  z-index: -1;
}

.container {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(8px);
  background: rgba(243, 247, 249, 0.8);
  border-bottom: 1px solid rgba(214, 226, 232, 0.8);
  z-index: 10;
}

.site-header__inner,
.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
}

.site-footer__inner {
  flex-direction: column;
  justify-content: center;
  text-align: center;
  gap: 0.95rem;
}

.site-footer__badge-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.site-footer__badge {
  display: block;
  width: min(100%, 230px);
  height: auto;
  margin: 0 auto;
}

.site-footer__badge-link:focus-visible {
  outline: 3px solid rgba(10, 126, 164, 0.35);
  outline-offset: 4px;
  border-radius: 10px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  width: 100%;
  order: 3;
}

.site-nav__link {
  color: var(--color-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.site-nav__link:hover,
.site-nav__link.is-active {
  color: var(--color-ink);
}

.brand {
  display: inline-flex;
  align-items: center;
  color: inherit;
  text-decoration: none;
  font-weight: 700;
}

.brand__logo {
  width: auto;
  height: 1.8rem;
  display: block;
}

.hero {
  padding: 5.5rem 0 3rem;
}

.page-content {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
  padding-bottom: 3rem;
}

.page-content > :first-child {
  margin-top: 0;
}

.page-content h2 {
  margin-top: 2.4rem;
}

.page-content h3 {
  margin-top: 1rem;
}

.page-content p,
.page-content li {
  max-width: 66ch;
}

.page-content ul,
.page-content ol {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1rem;
}

.page-content ul li,
.page-content ol li {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: 1.05rem 1.1rem 1.05rem 1.3rem;
}

.page-content ul li::before {
  content: "";
  position: absolute;
  left: 0.65rem;
  top: 1.35rem;
  width: 0.38rem;
  height: 0.38rem;
  border-radius: 50%;
  background: var(--color-accent);
}

.page-content ol {
  counter-reset: page-steps;
}

.page-content ol li {
  counter-increment: page-steps;
  padding-left: 3rem;
}

.page-content ol li::before {
  content: counter(page-steps);
  position: absolute;
  left: 1rem;
  top: 1rem;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 999px;
  background: var(--color-ink);
  color: #fff;
  display: grid;
  place-items: center;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.8rem;
}

.page-content li strong {
  color: var(--color-ink);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  color: var(--color-muted);
  margin: 0 0 0.75rem;
}

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

h1 {
  font-size: clamp(2rem, 5.2vw, 4rem);
  max-width: 18ch;
}

h2 {
  font-size: clamp(1.4rem, 3.6vw, 2.2rem);
  max-width: 26ch;
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
}

p {
  margin: 0;
  color: var(--color-muted);
}

.hero__subline {
  margin-top: 1.2rem;
  font-size: clamp(1rem, 1.9vw, 1.28rem);
  max-width: 48ch;
}

.hero__cta-wrap {
  margin-top: 1.8rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.95rem 1.2rem;
}

.hero__hint {
  font-size: 0.95rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  padding: 0.72rem 1.15rem;
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 140ms ease, background-color 140ms ease, color 140ms ease, border-color 140ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:focus-visible {
  outline: 3px solid rgba(10, 126, 164, 0.35);
  outline-offset: 2px;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-accent-strong);
}

.btn--ghost {
  color: var(--color-ink);
  border-color: var(--color-line);
  background: #fff;
}

.section {
  padding: 2.8rem 0;
}

.section__head {
  display: grid;
  gap: 0.85rem;
  margin-bottom: 1.4rem;
}

.stack-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.9rem;
}

.stack-list li {
  position: relative;
  padding: 0.95rem 1rem 0.95rem 1.3rem;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-soft);
}

.stack-list li::before {
  content: "";
  position: absolute;
  left: 0.65rem;
  top: 1.18rem;
  width: 0.36rem;
  height: 0.36rem;
  border-radius: 50%;
  background: var(--color-accent);
}

.cards {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  grid-column: span 12;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-line);
  padding: 1.25rem;
  box-shadow: var(--shadow-soft);
}

.card p {
  margin-top: 0.7rem;
}

.card--step {
  border-color: color-mix(in srgb, var(--color-accent) 30%, var(--color-line));
}

.swatches {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  margin-top: 1rem;
}

.swatch {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 0.8rem;
}

.swatch span {
  display: block;
  height: 72px;
  border-radius: 10px;
  border: 1px solid rgba(0, 0, 0, 0.08);
}

.swatch p {
  margin-top: 0.55rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
}

.site-footer {
  border-top: 1px solid rgba(214, 226, 232, 0.8);
  margin-top: 3rem;
  padding-bottom: 1.2rem;
}

.site-footer p,
.site-footer a {
  font-size: 0.9rem;
  color: var(--color-muted);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-accent-strong);
}

@media (min-width: 760px) {
  .site-header__inner {
    flex-wrap: nowrap;
  }

  .site-nav {
    width: auto;
    order: 0;
    margin-left: auto;
    margin-right: 0.5rem;
    gap: 1.25rem;
  }

  .page-content {
    padding-bottom: 4rem;
  }

  .page-content ul,
  .page-content ol {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }

  .brand__logo {
    height: 2rem;
  }

  .hero {
    padding: 7rem 0 4.2rem;
  }

  .section {
    padding: 3.6rem 0;
  }

  .card {
    grid-column: span 4;
    padding: 1.4rem;
  }

  .cards--steps .card {
    grid-column: span 4;
  }
}