:root {
  color-scheme: light dark;
  --bg: #f5f7fa;
  --panel: #ffffff;
  --panel-soft: #eef6fb;
  --text: #20242a;
  --muted: #626b78;
  --line: #dce1e8;
  --accent: #087f8c;
  --accent-strong: #066873;
  --accent-text: #ffffff;
  --shadow: 0 14px 42px rgb(35 45 60 / 10%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11151a;
    --panel: #191e25;
    --panel-soft: #15272c;
    --text: #e8ebef;
    --muted: #abb4c0;
    --line: #303844;
    --accent: #31b7c4;
    --accent-strong: #59cad4;
    --accent-text: #081518;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

body.app-site {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Yu Gothic UI", "Yu Gothic", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.8;
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  backdrop-filter: blur(12px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 2rem, 76rem);
  min-height: 4rem;
  margin: 0 auto;
  gap: 1.5rem;
}

.site-brand {
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: block;
  padding: 0.45rem 0.75rem;
  border-radius: 0.45rem;
  color: var(--muted);
  font-weight: 650;
  line-height: 1.4;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a[aria-current="page"] {
  background: var(--panel-soft);
  color: var(--accent-strong);
}

.site-main {
  width: min(100% - 2rem, 72rem);
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 6rem) 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(24rem, 1.15fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
  margin-bottom: clamp(4rem, 10vw, 8rem);
}

.eyebrow {
  margin: 0 0 0.6rem;
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1,
.page-title {
  margin: 0;
  font-size: clamp(2.2rem, 7vw, 4.5rem);
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.hero__lead,
.page-lead {
  margin: 1.35rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.18rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.8rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  padding: 0.65rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: var(--panel);
  color: var(--text);
  font-weight: 750;
  line-height: 1.3;
  text-decoration: none;
  transition: transform 120ms ease, box-shadow 120ms ease;
}

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

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

.window-shot,
.feature__image {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.window-shot img,
.feature__image img {
  display: block;
  width: 100%;
  height: auto;
}

.section-heading {
  max-width: 44rem;
  margin-bottom: 2.5rem;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  line-height: 1.25;
}

.section-heading p { margin: 0.75rem 0 0; color: var(--muted); }
.features { display: grid; gap: clamp(3rem, 8vw, 6rem); }

.feature {
  display: grid;
  grid-template-columns: minmax(16rem, 0.78fr) minmax(0, 1.22fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
}

.feature:nth-child(even) .feature__copy { order: 2; }
.feature:nth-child(even) .feature__image { order: 1; }
.feature h3 { margin: 0; font-size: clamp(1.45rem, 3vw, 2rem); line-height: 1.3; }
.feature p { margin: 0.8rem 0 0; color: var(--muted); }

.feature__image--compact {
  justify-self: center;
  width: min(100%, 36rem);
}

.cta {
  margin-top: clamp(4rem, 10vw, 8rem);
  padding: clamp(2rem, 6vw, 4rem);
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--panel-soft);
  text-align: center;
}

.cta h2 { margin: 0; font-size: clamp(1.65rem, 4vw, 2.35rem); }
.cta p { margin: 0.7rem auto 0; color: var(--muted); }
.cta .actions { justify-content: center; }

.download-card,
.app-card {
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.download-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(17rem, 0.55fr);
  align-items: start;
  gap: 2rem;
  margin-top: 3rem;
}

.download-card { padding: clamp(1.5rem, 5vw, 3rem); }
.download-card h2 { margin: 0; font-size: 1.5rem; }
.download-card p { color: var(--muted); }
.download-card ol { padding-left: 1.4rem; }
.download-card code { padding: 0.15em 0.35em; border-radius: 0.3rem; background: var(--panel-soft); }

.source-note {
  margin: 3rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

.source-note a { color: var(--accent-strong); }

.catalog-intro { max-width: 48rem; margin-bottom: 3rem; }
.app-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr)); gap: 1.25rem; }
.app-card { display: block; padding: 1.6rem; color: var(--text); text-decoration: none; transition: transform 120ms ease; }
.app-card:hover, .app-card:focus-visible { border-color: var(--accent); transform: translateY(-2px); }
.app-card h2 { margin: 0; font-size: 1.35rem; }
.app-card p { margin: 0.6rem 0 0; color: var(--muted); }
.app-card__link { display: inline-block; margin-top: 1rem; color: var(--accent-strong); font-weight: 750; }

.site-footer {
  width: min(100% - 2rem, 72rem);
  margin: 0 auto;
  padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 760px) {
  .site-header { position: static; }
  .site-header__inner { display: block; padding: 0.7rem 0; }
  .site-nav { margin-top: 0.45rem; overflow-x: auto; }
  .site-nav a { padding-left: 0.55rem; padding-right: 0.55rem; white-space: nowrap; }
  .hero, .feature, .download-layout { grid-template-columns: 1fr; }
  .hero { gap: 2.5rem; }
  .feature:nth-child(even) .feature__copy,
  .feature:nth-child(even) .feature__image { order: initial; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}