:root {
  color-scheme: light;
  --paper: #f3efe5;
  --ink: #282a25;
  --muted: #62665d;
  --line: #c9c7bd;
  --accent: #31583d;
  --warm: #8a4e3c;
  font-family: system-ui, -apple-system, "Segoe UI", "Yu Gothic", "Hiragino Sans", Meiryo, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); line-height: 1.75; }
a { color: var(--accent); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.skip-link { position: fixed; z-index: 10; inset-block-start: 8px; inset-inline-start: 8px; display: inline-flex; min-height: 44px; align-items: center; padding: 0 14px; border: 1px solid var(--accent); background: var(--paper); transform: translateY(calc(-100% - 12px)); }
.skip-link:focus { transform: translateY(0); }
.site-header, .distribution-shell, .site-footer { width: min(1080px, calc(100% - 40px)); margin-inline: auto; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.site-header nav { display: flex; flex-wrap: wrap; gap: 18px; font-size: .9rem; }
.site-header nav a { display: inline-flex; align-items: center; min-height: 44px; }
.site-header nav a, .brand { color: var(--ink); }
.brand { display: inline-flex; align-items: center; min-height: 44px; font-weight: 700; text-decoration: none; }
.distribution-shell { padding: clamp(30px, 6vw, 68px) 0 72px; }
.page-title { max-width: 46rem; padding-bottom: 28px; border-bottom: 1px solid var(--line); }
.eyebrow, .software-type { margin: 0 0 8px; color: var(--warm); font-size: .84rem; }
.page-title h1, .software-copy h2 { margin: 0; font-family: Georgia, "Yu Mincho", "Hiragino Mincho ProN", serif; font-weight: 500; line-height: 1.2; }
.page-title h1 { font-size: clamp(2.3rem, 6vw, 4rem); }
.page-title > p:last-child { margin: 14px 0 0; color: var(--muted); }
.software-list { border-bottom: 1px solid var(--line); }
.software-item { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(20px, 5vw, 58px); align-items: center; padding: 30px 0; border-bottom: 1px solid var(--line); }
.software-item:last-child { border-bottom: 0; }
.software-item-rubimorph { grid-template-columns: minmax(0, 220px) minmax(0, 1fr); }
.software-copy { min-width: 0; }
.software-copy h2 { font-size: clamp(1.8rem, 4vw, 2.7rem); }
.software-copy > p:not(.software-type) { max-width: 36rem; color: var(--muted); }
.software-mark { display: grid; place-items: center; min-width: 0; margin: 0; }
.software-mark img { display: block; width: 100%; max-width: 220px; height: auto; }
.software-image { margin: 0; }
.software-image img { display: block; width: 100%; height: auto; border: 1px solid var(--line); }
.software-links { display: flex; flex-wrap: wrap; gap: 14px 22px; align-items: center; margin-top: 18px; }
.software-links a { min-height: 44px; display: inline-flex; align-items: center; }
.software-links .primary-link { padding: 0 14px; border: 1px solid var(--accent); color: var(--accent); text-decoration: none; }
.legacy-files { max-width: 46rem; margin-top: 32px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.legacy-files summary { width: fit-content; min-height: 44px; display: flex; align-items: center; padding: 15px 0; cursor: pointer; }
.legacy-files p { color: var(--muted); }
.legacy-files ul { display: grid; gap: 8px; padding-left: 1.2rem; margin: 0 0 20px; }
.legacy-files ul a { display: inline-flex; min-height: 44px; align-items: center; }
.site-footer { padding: 20px 0 36px; border-top: 1px solid var(--line); font-size: .88rem; }
.site-footer a { display: inline-flex; align-items: center; min-height: 44px; color: var(--muted); }

.detail-shell { width: min(900px, calc(100% - 40px)); margin: 0 auto; padding: clamp(30px, 6vw, 70px) 0; }
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 0 .5rem; min-height: 44px; margin: 0 0 34px; font-size: .9rem; }
.breadcrumb a { display: inline-flex; align-items: center; min-height: 44px; }
.detail-header { max-width: 48rem; padding-bottom: 28px; border-bottom: 1px solid var(--line); }
.detail-header h1 { margin: 0; font: 500 clamp(2.5rem, 7vw, 4.5rem)/1.12 Georgia, "Yu Mincho", serif; }
.detail-header p:last-child { color: var(--muted); }
.download-block { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 24px; margin: 24px 0 48px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.download-block a { display: inline-flex; min-height: 44px; align-items: center; padding: 8px 12px; border: 1px solid var(--accent); text-decoration: none; }
.download-block span { color: var(--muted); font-size: .9rem; }
.detail-section { max-width: 48rem; margin: 34px 0; }
.detail-section h2 { margin: 0 0 12px; font: 500 1.65rem/1.3 Georgia, "Yu Mincho", serif; }
.detail-section p, .detail-section li { color: var(--muted); }
.detail-section ul { padding-left: 1.25rem; }
.images { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.images figure { margin: 0; }
.images img { display: block; width: 100%; height: auto; border: 1px solid var(--line); }
.images figcaption { margin-top: 7px; color: var(--muted); font-size: .85rem; }
.checksum { overflow-wrap: anywhere; padding: 12px; border: 1px solid var(--line); font: .82rem/1.6 ui-monospace, Consolas, monospace; }
.disclaimer { padding-top: 20px; border-top: 1px solid var(--line); }
.disclaimer p { font-size: .92rem; }

@media (max-width: 680px) {
  .site-header, .distribution-shell, .detail-shell, .site-footer { width: min(100% - 28px, 1080px); }
  .site-header { align-items: flex-start; flex-direction: column; gap: 8px; }
  .software-item { grid-template-columns: 1fr; gap: 20px; }
  .software-mark { justify-items: start; }
  .software-mark img { width: min(48vw, 180px); }
  .software-image { order: 2; }
  .images { grid-template-columns: 1fr; }
}