:root {
  color-scheme: dark;
  font-family: Inter, "Noto Sans JP", "Yu Gothic UI", Meiryo, system-ui, sans-serif;
  --bg: #101214;
  --panel: #171a1d;
  --panel-light: #1d2125;
  --border: #30353a;
  --text: #f0f1f2;
  --muted: #a2a8ad;
  --accent: #78a8d8;
  --danger: #e18787;
  --content: 900px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); line-height: 1.75; }
a { color: #9bc2e7; text-underline-offset: .2em; }
a:hover { color: #c6def5; }
main {
  width: min(var(--content), calc(100% - 36px));
  margin-inline: auto;
}
.site-header, body > header:not(.site-header) {
  width: 100%;
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 0;
  padding-inline: clamp(18px, 3vw, 48px);
  border-bottom: 1px solid var(--border);
}
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--text); font-weight: 700; text-decoration: none; white-space: nowrap; }
.brand img { width: 34px; height: 34px; border-radius: 7px; }
.main-nav, header nav { display: flex; flex-wrap: wrap; gap: 4px; }
.main-nav a { padding: 7px 10px; border-radius: 6px; color: var(--muted); font-size: .86rem; text-decoration: none; }
.main-nav a:hover, .main-nav a[aria-current="page"] { background: var(--panel-light); color: var(--text); }
.language-select {
  min-height: 34px;
  margin-left: 5px;
  padding: 5px 25px 5px 9px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: .8rem;
  cursor: pointer;
}
main { padding-bottom: 80px; }

.home { max-width: 760px; }
.home-intro { padding: 95px 0 72px; }
.app-icon { width: 62px; height: 62px; margin-bottom: 26px; border-radius: 12px; }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: .78rem; font-weight: 700; }
h1, h2, h3 { line-height: 1.35; }
h1 { margin: 0 0 24px; font-size: clamp(2.35rem, 7vw, 4.3rem); letter-spacing: -.045em; }
h2 { margin: 0 0 8px; font-size: 1.35rem; }
h3 { margin: 0 0 7px; font-size: 1.08rem; }
.lead { max-width: 680px; margin: 0; color: #c2c7ca; font-size: 1.05rem; }
.actions, .bottom-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 16px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--panel-light);
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}
.button:hover { border-color: #5c6872; color: #fff; }
.button.primary { border-color: #7aa8d3; background: #78a8d8; color: #111820; }
.status { min-height: 1.4em; margin: 11px 0 0; color: #7f878d; font-size: .78rem; }
.page-links { display: grid; border-top: 1px solid var(--border); }
.page-links a { display: grid; grid-template-columns: 1fr auto; gap: 2px 20px; padding: 23px 4px; border-bottom: 1px solid var(--border); color: var(--text); text-decoration: none; }
.page-links span { font-weight: 700; }
.page-links small { grid-column: 1; color: var(--muted); }
.page-links b { grid-column: 2; grid-row: 1 / 3; align-self: center; color: var(--muted); font-weight: 400; }
.page-links a:hover b { color: var(--accent); }

.page-intro { max-width: 720px; padding: 78px 0 52px; }
.page-intro h1 { font-size: clamp(2.2rem, 6vw, 3.5rem); }
.plain-list { border-top: 1px solid var(--border); }
.plain-list article { display: grid; grid-template-columns: 55px 1fr; gap: 20px; padding: 27px 4px; border-bottom: 1px solid var(--border); }
.plain-list article > span { color: #727a80; font-size: .78rem; font-weight: 700; }
.plain-list p { margin: 0; color: var(--muted); }
.bottom-actions { margin-top: 42px; }

.release-section { padding-top: 5px; }
.release-summary { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 3px 24px; padding: 20px 0; border-block: 1px solid var(--border); }
.release-summary p { grid-column: 1; margin: 0; color: var(--muted); font-size: .8rem; }
.release-summary strong { grid-column: 1; font-size: 1.4rem; }
.release-summary span { grid-column: 2; grid-row: 1 / 3; align-self: center; color: var(--muted); font-size: .8rem; }
.release-list { display: grid; gap: 12px; margin-top: 24px; }
.release-card { padding: 25px; border: 1px solid var(--border); border-radius: 8px; background: var(--panel); }
.release-card-header { display: flex; justify-content: space-between; gap: 20px; padding-bottom: 16px; border-bottom: 1px solid var(--border); }
.release-card-header h2 { margin-top: 4px; }
.release-version { margin: 0; color: var(--accent); font-size: .72rem; font-weight: 700; }
.release-card time { color: var(--muted); font-size: .78rem; white-space: nowrap; }
.release-card ul { margin: 18px 0; padding-left: 1.2rem; color: #c4c9cc; }
.release-card li { margin: .45em 0; }
.text-link { font-size: .88rem; font-weight: 700; text-decoration: none; }
.loading-card { min-height: 130px; }

.danger-text { color: var(--danger); }
.warning-panel { display: grid; grid-template-columns: 48px 1fr; gap: 18px; padding: 22px; border: 1px solid #694343; border-radius: 8px; background: #21191a; }
.warning-icon { width: 44px; height: 44px; display: grid; place-items: center; border: 1px solid #9a6060; border-radius: 50%; color: var(--danger); font-weight: 800; }
.warning-panel h2 { font-size: 1.18rem; }
.warning-panel p { margin: 0; color: #c9afb1; }
.simple-panel { margin-top: 18px; display: flex; align-items: center; justify-content: space-between; gap: 28px; padding: 24px; border: 1px solid var(--border); border-radius: 8px; background: var(--panel); }
.simple-panel p { margin: 0; color: var(--muted); }
.preview-button { border-color: #8f5555; background: #743f43; }
.planned { margin-top: 65px; }
.planned > p { color: var(--muted); }
.compact-list { margin-top: 22px; }
.stable-choice { margin-top: 38px; }

.card { margin: 20px 0; padding: 22px; border: 1px solid var(--border); border-radius: 8px; background: var(--panel); }
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.grid .card { margin: 0; }
.notice { padding: 15px 17px; border-left: 3px solid var(--accent); background: #18212a; }
code { overflow-wrap: anywhere; color: #b8d7f1; }
body > main > h1 { padding-top: 55px; font-size: clamp(2.2rem, 6vw, 3.5rem); }
body > main > h2 { margin-top: 2.1em; font-size: 1.5rem; }

.site-footer, body > footer:not(.site-footer) {
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px 30px;
  align-items: center;
  margin: 0;
  padding: 30px clamp(18px, 3vw, 48px) 42px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .78rem;
}
.site-footer > span { color: var(--text); font-weight: 700; }
.site-footer nav, body > footer:not(.site-footer) nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 14px; }
.site-footer nav a, body > footer:not(.site-footer) nav a { color: var(--muted); text-decoration: none; }
.site-footer > p { grid-column: 1 / -1; margin: 0; color: #747c82; }

@media (max-width: 650px) {
  .site-header, body > header:not(.site-header) { min-height: auto; align-items: flex-start; padding: 16px 18px; }
  .brand span { display: none; }
  .main-nav { justify-content: flex-end; }
  .main-nav a { padding: 6px 7px; font-size: .76rem; }
  .language-select { width: 100%; margin: 4px 0 0 auto; }
  .home-intro { padding: 68px 0 55px; }
  .page-intro { padding: 60px 0 40px; }
  .release-summary { grid-template-columns: 1fr; }
  .release-summary span { grid-column: 1; grid-row: auto; }
  .release-card-header, .simple-panel { align-items: flex-start; flex-direction: column; }
  .warning-panel { grid-template-columns: 1fr; }
  .grid { grid-template-columns: 1fr; }
  .site-footer, body > footer:not(.site-footer) { grid-template-columns: 1fr; }
  .site-footer nav, body > footer:not(.site-footer) nav { justify-content: flex-start; }
}