/* kigaku.fujibit.com 共通スタイル。scripts/build_site.py が生成する各ページから読み込む。
   スチールブルー #5E7A9B と真鍮色を基調にした、図面風のデザイン。外部のフォント・CDN は使わない */
:root {
  --bg: #0c1118;
  --bg-2: #121a24;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.08);
  --border: rgba(143, 168, 194, 0.18);
  --border-2: rgba(143, 168, 194, 0.36);
  --text: #e8eef5;
  --heading: #fff;
  --muted: #a8b6c6;
  --accent: #8fb0d4;
  --brass: #e0a458;
  --em: linear-gradient(100deg, #a9c8e8 0%, #8fb0d4 45%, #e0a458 100%);
  --link: #a9c8e8;
  --header-bg: rgba(12, 17, 24, 0.74);
  --shadow: 0 20px 44px rgba(0, 0, 0, 0.45);
  --store-bg: #fff;
  --store-fg: #0c1118;
  --grid: rgba(143, 168, 194, 0.07);
  /* mechanism.js が読む色 */
  --m-ring: #6c7a89;
  --m-planet: #8fa8c2;
  --m-sun: #e0a458;
  --m-arm: #d9636e;
  --m-wheel: #a9bdd2;
  --m-hub: #0c1118;
  --font: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Segoe UI", "Noto Sans", "Noto Sans JP", Roboto, sans-serif;
  color-scheme: dark light;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f7fa;
    --bg-2: #e9eff5;
    --surface: rgba(255, 255, 255, 0.82);
    --surface-2: #fff;
    --border: rgba(62, 88, 118, 0.17);
    --border-2: rgba(62, 88, 118, 0.34);
    --text: #16222e;
    --heading: #0b1520;
    --muted: #465767;
    --accent: #3f6085;
    --brass: #a4661a;
    --em: linear-gradient(100deg, #3f6085 0%, #34587f 50%, #a4661a 100%);
    --link: #2f5680;
    --header-bg: rgba(244, 247, 250, 0.8);
    --shadow: 0 20px 44px rgba(30, 60, 90, 0.14);
    --store-bg: #0b1520;
    --store-fg: #fff;
    --grid: rgba(62, 88, 118, 0.07);
    --m-ring: #7d8c9c;
    --m-planet: #6d89a8;
    --m-sun: #d08f3f;
    --m-arm: #c44d59;
    --m-wheel: #8199b2;
    --m-hub: #f4f7fa;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 var(--font);
  overflow-wrap: anywhere;
  overflow-x: hidden;
}
a { color: var(--link); }
img, canvas { display: block; max-width: 100%; }
.wrap { max-width: 1160px; margin-inline: auto; padding-inline: 16px; }
.skip { position: absolute; inset-inline-start: -999px; top: 8px; background: var(--surface-2); padding: 8px 12px; border-radius: 8px; z-index: 20; }
.skip:focus { inset-inline-start: 8px; }
:focus-visible { outline: 2px solid var(--brass); outline-offset: 2px; }

.site-header { position: sticky; top: 0; z-index: 10; background: var(--header-bg); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); }
.site-header .wrap { display: flex; align-items: center; gap: 12px; min-height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--heading); font-weight: 800; text-decoration: none; margin-inline-end: auto; white-space: nowrap; }
.brand img { border-radius: 9px; }
.nav { display: flex; align-items: center; gap: 16px; }
.nav > a { color: var(--muted); text-decoration: none; font-size: 0.92rem; }
.nav > a:hover { color: var(--heading); }
.lang-picker { position: relative; }
.lang-picker summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: 6px; padding: 6px 12px; border: 1px solid var(--border-2); border-radius: 999px; font-size: 0.88rem; }
.lang-picker summary::-webkit-details-marker { display: none; }
.lang-menu { position: absolute; inset-inline-end: 0; top: calc(100% + 8px); width: min(560px, calc(100vw - 32px)); max-height: 66vh; overflow-y: auto; display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 2px; padding: 10px; background: var(--bg-2); border: 1px solid var(--border-2); border-radius: 16px; box-shadow: var(--shadow); }
.lang-menu a { padding: 6px 10px; border-radius: 8px; color: var(--text); text-decoration: none; font-size: 0.9rem; }
.lang-menu a:hover { background: var(--surface-2); }
.lang-menu a[aria-current] { background: var(--surface-2); font-weight: 700; }

.hero { position: relative; overflow: hidden; background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px); background-size: 32px 32px; border-bottom: 1px solid var(--border); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1fr); gap: 24px; align-items: center; padding-block: 40px; }
.eyebrow { color: var(--brass); font-weight: 700; font-size: 0.86rem; letter-spacing: 0.04em; margin: 0 0 10px; }
h1, h2, h3 { color: var(--heading); line-height: 1.25; margin: 0; }
.hero h1 { font-size: clamp(2rem, 8vw, 3.6rem); font-weight: 800; letter-spacing: -0.01em; background: var(--em); -webkit-background-clip: text; background-clip: text; color: transparent; padding-block: 0.06em; text-wrap: balance; }
:lang(ja) h1, :lang(ja) h2 { word-break: auto-phrase; }
.lead { color: var(--muted); font-size: 1.06rem; margin: 16px 0 0; }
.stores { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.store { display: inline-flex; align-items: center; gap: 10px; padding: 9px 18px; border-radius: 14px; background: var(--store-bg); color: var(--store-fg); text-decoration: none; transition: transform 0.15s; }
.store:hover { transform: translateY(-2px); }
.store svg { width: 24px; height: 24px; fill: currentColor; flex: none; }
.store span { display: block; line-height: 1.2; }
.store small { display: block; font-size: 0.7rem; opacity: 0.75; }
.store b { font-size: 1.05rem; }
.stats { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px 22px; margin: 26px 0 0; padding: 0; list-style: none; color: var(--muted); font-size: 0.92rem; }
.stats b { color: var(--heading); font-size: 1.3rem; }
.mech { margin: 0; }
.mech canvas { width: 100%; height: auto; aspect-ratio: 620 / 480; }
.mech figcaption { text-align: center; color: var(--muted); font-size: 0.82rem; margin-top: 4px; }

section.block { padding-block: 56px; }
section.alt { background: var(--bg-2); border-block: 1px solid var(--border); }
.block h2 { font-size: clamp(1.5rem, 5vw, 2.2rem); font-weight: 800; }
.sub { color: var(--muted); margin: 10px 0 0; }
.cat { margin-top: 30px; }
.cat h3 { font-size: 1.02rem; color: var(--brass); margin-bottom: 12px; }
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 240px), 1fr)); }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: 18px; }
.mode { display: flex; gap: 14px; align-items: center; transition: border-color 0.15s, transform 0.15s; }
.mode:hover { border-color: var(--border-2); transform: translateY(-2px); }
.mode svg { flex: none; width: 44px; height: 44px; padding: 9px; border-radius: 13px; background: var(--surface-2); fill: none; stroke: var(--accent); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.mode h4 { margin: 0; color: var(--heading); font-size: 1rem; line-height: 1.3; }
.mode p { margin: 2px 0 0; color: var(--muted); font-size: 0.86rem; line-height: 1.4; }
.steps { counter-reset: s; margin-top: 26px; }
.steps .card { counter-increment: s; }
.steps .card::before { content: counter(s); display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--brass); color: #10151c; font-weight: 800; margin-bottom: 12px; }
.features { margin-top: 26px; }
.card h3 { font-size: 1.06rem; margin-bottom: 6px; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.download { text-align: center; }
.download .stores { justify-content: center; }

.page { padding-block: 40px 56px; }
.page .container { max-width: 800px; margin-inline: auto; padding-inline: 16px; }
.page h1 { font-size: clamp(1.7rem, 6vw, 2.4rem); font-weight: 800; }
.updated { color: var(--muted); font-size: 0.9rem; margin: 8px 0 22px; }
.page .card { margin-bottom: 12px; }
.page .card h2 { font-size: 1.1rem; margin-bottom: 8px; }
.page .card p, .page .card li { color: var(--text); font-size: 0.97rem; }
.page .card p + p, .page .card ul + p { margin-top: 10px; }
.page ul { margin: 10px 0 0; padding-inline-start: 22px; }
.page .card h3 { margin: 14px 0 2px; font-size: 1rem; }
.notice { font-size: 0.87rem; color: var(--muted); border-inline-start: 3px solid var(--brass); padding: 4px 12px; margin: 0 0 18px; }
.back { display: inline-block; margin-top: 12px; }

.site-footer { border-top: 1px solid var(--border); padding-block: 26px; color: var(--muted); font-size: 0.88rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 18px; justify-content: space-between; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 6px 16px; }
.site-footer a { color: var(--muted); }

@media (max-width: 719px) { .hide-sm { display: none; } }
@media (min-width: 900px) {
  .hero .wrap { grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); padding-block: 72px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .store, .mode { transition: none; }
  .store:hover, .mode:hover { transform: none; }
}