:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-subtle: #f8fafc;
  --ink: #1f2937;
  --muted: #5b6472;
  --line: #d6dee8;
  --line-strong: #b9c4d1;
  --accent: #005bac;
  --success: #2f6f44;
  --danger: #a14535;
  --radius-lg: 12px;
  --radius-md: 8px;
  --radius-sm: 6px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--ink);
  background: var(--bg);
}

img {
  max-width: 100%;
}

a {
  color: inherit;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.site-shell {
  width: min(1040px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1.25rem 0 3rem;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-sm);
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.06em;
  background: var(--accent);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.brand-copy strong {
  font-size: 1rem;
}

.brand-copy small {
  color: var(--muted);
  font-size: 0.8rem;
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.top-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.5rem;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}

.top-nav a:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}

main {
  display: grid;
  gap: 1rem;
}

.surface {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  padding: 1.5rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 1fr);
  gap: 1.5rem;
  align-items: start;
}

.hero-copy,
.hero-panel {
  display: grid;
  gap: 1rem;
  align-content: start;
}

.eyebrow,
.feature-kicker,
.status-label {
  margin: 0;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

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

h1 {
  margin-bottom: 0.85rem;
  font-size: clamp(1.7rem, 3.2vw, 2.35rem);
  line-height: 1.3;
  letter-spacing: -0.03em;
}

h2 {
  margin-bottom: 0.65rem;
  font-size: clamp(1.2rem, 2.2vw, 1.55rem);
  line-height: 1.35;
}

h3 {
  margin-bottom: 0.45rem;
  font-size: 1rem;
}

p {
  margin-bottom: 0;
  line-height: 1.65;
}

.hero-text,
.status-note,
.feature-card p,
.flow-list p,
.section-grid p,
.surface small {
  color: var(--muted);
}

.hero-actions,
.section-headline {
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.section-headline > :first-child {
  min-width: min(100%, 24rem);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  white-space: nowrap;
}

.button:hover {
  border-color: var(--ink);
}

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

.button-primary:hover {
  background: #004687;
}

.button-secondary {
  background: var(--surface);
  color: var(--ink);
}

.button[aria-disabled="true"] {
  color: var(--muted);
  border-color: var(--line);
  pointer-events: none;
}

.status-card {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-subtle);
}

.status-card-accent {
  background: var(--surface-subtle);
}

.status-value {
  margin: 0.2rem 0 0.35rem;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.status-grid,
.support-grid,
.download-grid {
  display: grid;
  gap: 0.75rem;
}

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

.metric-card,
.feature-card,
.download-card,
.support-grid article {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
  padding: 1rem;
}

.metric-label {
  margin-bottom: 0.3rem;
  font-size: 0.82rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.metric-value {
  margin: 0;
  font-weight: 700;
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 1.25rem;
  align-items: start;
}

.flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.flow-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  align-items: start;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.flow-index {
  display: inline-grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  background: #edf3f8;
}

.triptych {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.feature-card {
  display: grid;
  gap: 0.75rem;
}

.text-link {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.split-section {
  display: grid;
  gap: 1rem;
}

.support-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.download-grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.download-card {
  display: grid;
  gap: 0.75rem;
}

.download-card.recommended {
  border: 2px solid var(--accent, #005bac);
  box-shadow: 0 0 0 1px var(--accent, #005bac);
}

.recommended-badge {
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent, #005bac);
  white-space: nowrap;
}

.download-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.platform-badge,
.release-badge {
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.65rem;
  font-size: 0.74rem;
  font-weight: 600;
  text-transform: uppercase;
  white-space: nowrap;
}

.platform-badge {
  color: var(--muted);
  background: #f1f1f1;
}

.release-badge[data-status="published"] {
  color: #fff;
  background: var(--success);
}

.release-badge[data-status="preparing"],
.release-badge[data-status="draft"] {
  color: var(--accent);
  background: #e9eef4;
}

.download-meta {
  display: grid;
  gap: 0.35rem;
  font-size: 0.92rem;
  color: var(--muted);
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.download-actions .button {
  flex: 1 1 180px;
}

.compact-flow li {
  padding-block: 0.9rem;
}

.reveal-up,
.delay-1,
.delay-2 {
  opacity: 1;
  transform: none;
  animation: none;
}

.button:focus-visible,
.top-nav a:focus-visible,
.text-link:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid #111;
  outline-offset: 2px;
}

@media (max-width: 960px) {
  .hero,
  .section-grid,
  .triptych,
  .support-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-shell {
    width: min(100% - 1rem, 1040px);
    padding-top: 0.75rem;
  }

  .site-header,
  .hero-actions,
  .section-headline {
    align-items: stretch;
  }

  .top-nav {
    display: grid;
  }

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

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

  .surface {
    padding: 1.1rem;
  }

  h1 {
    font-size: clamp(1.55rem, 7vw, 2rem);
  }
}