:root {
  --background: #f4f6f8;
  --surface: #ffffff;
  --text: #20262d;
  --muted: #5d6873;
  --border: #d4dbe1;
  --primary: #175f8c;
  --primary-dark: #104866;
  --soft: #edf1f4;
  --code-background: #18212a;
  --max-width: 1060px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family:
    "Yu Gothic UI",
    "Yu Gothic",
    Meiryo,
    system-ui,
    sans-serif;
  line-height: 1.75;
}

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

code,
pre {
  font-family: Consolas, "Cascadia Code", monospace;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.header-inner,
main,
footer {
  width: min(calc(100% - 32px), var(--max-width));
  margin-inline: auto;
}

.header-inner {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 700;
  text-decoration: none;
}

.product-link img {
  border-radius: 50%;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

nav a {
  color: var(--muted);
  font-size: 0.9rem;
  text-decoration: none;
}

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

.page-intro {
  padding: 52px 0 38px;
}

.page-intro h1 {
  margin: 0 0 20px;
  font-size: clamp(2.1rem, 6vw, 3.6rem);
  line-height: 1.2;
}

.page-intro p {
  max-width: 860px;
  margin: 0 0 12px;
}

.section {
  padding: 42px 0;
  border-top: 1px solid var(--border);
}

h2 {
  margin: 0 0 22px;
  font-size: 1.8rem;
  line-height: 1.35;
}

h3 {
  margin: 0 0 12px;
  font-size: 1.16rem;
}

h4 {
  margin: 22px 0 10px;
  font-size: 1rem;
}

p {
  margin: 0 0 16px;
}

.release-panel,
.guide-block {
  background: var(--surface);
  border: 1px solid var(--border);
}

.release-panel {
  padding: 24px;
  margin-bottom: 18px;
}

.release-status {
  margin-bottom: 4px;
  font-weight: 700;
}

.release-date {
  min-height: 1.5em;
  color: var(--muted);
  font-size: 0.9rem;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0;
}

.download-card {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-height: 92px;
  padding: 16px;
  border: 1px solid var(--primary);
  border-radius: 4px;
  background: var(--surface);
  text-decoration: none;
}

.download-card.primary {
  background: var(--primary);
  color: #ffffff;
}

.download-card:not(.primary):hover,
.download-card:not(.primary):focus-visible {
  background: #eaf1f6;
}

.download-card.primary:hover,
.download-card.primary:focus-visible {
  background: var(--primary-dark);
}

.download-card span {
  font-size: 0.88rem;
  font-weight: 400;
}

.release-links {
  margin-bottom: 0;
}

.guide-block {
  padding: 22px;
  margin-bottom: 16px;
}

.guide-block:last-child {
  margin-bottom: 0;
}

ol,
ul {
  padding-left: 1.5rem;
}

li + li {
  margin-top: 0.45rem;
}

li ul {
  margin-top: 0.45rem;
}

dl {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 8px 18px;
  margin-bottom: 0;
}

dt {
  font-weight: 700;
}

dd {
  margin: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
}

th,
td {
  padding: 11px 13px;
  border: 1px solid var(--border);
  text-align: left;
}

th {
  background: var(--soft);
}

.notation-list {
  display: grid;
  gap: 8px;
}

code {
  padding: 0.12em 0.35em;
  background: var(--soft);
  border-radius: 3px;
}

.command-block {
  margin-bottom: 22px;
}

pre {
  overflow-x: auto;
  margin: 0;
  padding: 15px;
  background: var(--code-background);
  color: #f4f7f9;
  border-radius: 4px;
  line-height: 1.55;
}

pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

footer {
  padding: 28px 0 42px;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

footer p {
  margin: 0;
}

@media (max-width: 760px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  nav {
    gap: 12px;
  }

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

  dl {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  dd + dt {
    margin-top: 10px;
  }
}

@media (max-width: 520px) {
  nav {
    display: none;
  }

  .release-panel,
  .guide-block {
    padding: 18px;
  }
}