header nav {
  display: flex;
  gap: 20px;
}

header nav a,
footer a {
  color: var(--muted);
  font-size: 0.82rem;
  text-decoration: none;
}

form label {
  font-size: 0.875rem;
}

form input,
form select {
  font-size: 0.9rem;
}

header nav a:hover,
footer a:hover {
  color: var(--blue);
}

.guide-grid {
  display: grid;
  grid-template-columns: 1.25fr repeat(3, 1fr);
  margin: 96px 0;
  border-top: 2px solid var(--ink);
  border-left: 1px solid var(--line);
}

.guide-grid > * {
  min-height: 260px;
  padding: 28px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.8);
}

.guide-grid a {
  color: var(--ink);
  text-decoration: none;
  transition: background 0.18s ease;
}

.guide-grid a:hover {
  background: var(--yellow);
}

.guide-grid h2 {
  margin: 0;
  font-size: clamp(2rem, 3vw, 3.5rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.guide-grid h3 {
  margin: 82px 0 10px;
  font-size: 1.05rem;
}

.guide-grid span {
  color: var(--blue);
  font: 800 0.72rem/1 ui-monospace, SFMono-Regular, monospace;
}

.guide-grid p {
  color: var(--muted);
  font-size: 0.84rem;
}

.pro-card {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 40px;
  padding: 52px;
  margin-bottom: 28px;
  background: var(--blue);
  color: white;
  box-shadow: 9px 9px 0 var(--yellow);
}

.pro-card h2 {
  margin: 0 0 12px;
  font-size: clamp(2.4rem, 4vw, 4.5rem);
  line-height: 1;
  letter-spacing: -0.055em;
}

.pro-card p:last-child {
  max-width: 690px;
  margin: 0;
  color: #ccd1ff;
}

.pro-card .kicker {
  color: var(--yellow);
}

.pro-card button {
  min-width: 190px;
  min-height: 46px;
  border: 1px solid #8893ef;
  background: rgba(255, 255, 255, 0.1);
  color: #d8dcff;
  font-weight: 800;
}

footer p {
  display: flex;
  gap: 18px;
  margin: 0;
}

.article-page {
  max-width: 900px;
  margin: 0 auto;
  padding: 76px 28px 120px;
}

.article-page h1 {
  margin-bottom: 34px;
}

.article-page h2 {
  margin: 52px 0 16px;
  font-size: 2rem;
  letter-spacing: -0.04em;
}

.article-page p,
.article-page li {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.8;
}

.article-page pre {
  min-height: auto;
  max-height: 540px;
  margin: 24px 0;
}

.article-page .download-link {
  display: inline-block;
  padding: 12px 16px;
  background: var(--yellow);
  color: var(--ink);
  font-weight: 850;
  text-decoration: none;
  box-shadow: 4px 4px 0 var(--blue);
}

.article-page .callout {
  padding: 18px;
  border-left: 4px solid var(--blue);
  background: #eef0ff;
}

@media (max-width: 1000px) {
  .guide-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  header nav {
    display: none;
  }

  .guide-grid {
    grid-template-columns: 1fr;
    margin: 68px 0;
  }

  .guide-grid > * {
    min-height: 210px;
  }

  .guide-grid h3 {
    margin-top: 52px;
  }

  .pro-card {
    align-items: flex-start;
    flex-direction: column;
    padding: 32px 24px;
  }

  .article-page {
    padding: 52px 18px 90px;
  }
}