:root {
  --bg: #eef2f6;
  --card: #ffffff;
  --text: #1f2733;
  --sub: #5a6675;
  --accent: #0b6bcb;
  --accent-dark: #095caf;
  --accent-pale: #e8f1fb;
  --green: #1a8a4e;
  --green-pale: #e6f5ec;
  --orange: #c05f00;
  --orange-pale: #fdf1e2;
  --border: #d7dee7;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Meiryo", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
}
a { color: var(--accent); }
a:focus-visible, .btn:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.shell { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

/* ---------- ブランド ---------- */
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text); }
.brand svg { width: 36px; height: 36px; flex-shrink: 0; }
.brand-name { font-size: 1.5rem; font-weight: 800; letter-spacing: -.01em; line-height: 1; }

/* ---------- ホーム ---------- */
.hub { display: grid; gap: 36px; padding-top: 48px; padding-bottom: 72px; }
.hub-side .brand svg { width: 44px; height: 44px; }
.hub-side .brand-name { font-size: 2.2rem; }
.lede { margin-top: 22px; font-size: 1.02rem; }
.byline { margin-top: 16px; font-size: .9rem; color: var(--sub); }
.side-links { margin-top: 18px; display: flex; flex-direction: column; gap: 4px; font-size: .92rem; }

.apps { list-style: none; background: var(--card); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.app { position: relative; display: grid; gap: 8px; padding: 24px 26px; border-top: 1px solid var(--border); }
.app:first-child { border-top: 0; }
.app:hover { background: #f7faff; }
.app:focus-within { outline: 3px solid var(--accent); outline-offset: -3px; }
.app h2 { font-size: 1.3rem; line-height: 1.4; }
.app h2 a { color: var(--text); text-decoration: none; }
.app h2 a::after { content: ""; position: absolute; inset: 0; }
.app h2 a:focus-visible { outline: none; }
.app p { color: var(--sub); font-size: .95rem; max-width: 38em; }
.go { font-size: .85rem; font-weight: 700; color: var(--accent); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-size: .78rem; font-weight: 700; padding: 2px 10px; border-radius: 999px; white-space: nowrap; background: #e3e9f0; color: var(--sub); }
.chip.live { background: var(--green-pale); color: var(--green); }
.chip.login { background: var(--accent-pale); color: var(--accent); }
.chip.wip { background: var(--orange-pale); color: var(--orange); }

@media (min-width: 860px) {
  .hub { grid-template-columns: 300px 1fr; column-gap: 64px; padding-top: 80px; }
  .hub-side { position: sticky; top: 48px; align-self: start; }
}

/* ---------- アプリ紹介ページ ---------- */
.top { background: var(--card); border-bottom: 1px solid var(--border); }
.top .shell { display: flex; align-items: center; gap: 20px; min-height: 56px; }
.crumbs { font-size: .85rem; color: var(--sub); }
.crumbs a { color: var(--sub); }

.hero { padding: 52px 0 28px; }
.hero h1 { font-size: clamp(1.75rem, 4.2vw, 2.4rem); line-height: 1.35; letter-spacing: .01em; text-wrap: balance; }
.hero .lede { max-width: 40em; margin-top: 16px; font-size: 1.05rem; }
.hero .chips { margin-top: 18px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.btn { display: inline-block; padding: 13px 22px; border-radius: 10px; font-weight: 700; font-size: 1rem; text-decoration: none; line-height: 1.4; }
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-dark); }
.btn.ghost { background: var(--card); border: 1px solid var(--border); color: var(--text); }
.btn.ghost:hover { border-color: var(--accent); }
.btn.off { background: #dde3ea; color: var(--sub); cursor: default; }
.note { margin-top: 12px; font-size: .88rem; color: var(--sub); }

.section { padding: 26px 0; }
.section h2 { font-size: 1.25rem; line-height: 1.5; margin-bottom: 14px; }
.prose { max-width: 44em; }
.prose p + p { margin-top: 12px; }

.panel { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 8px 26px; }
.panel dl > div { padding: 16px 0; border-top: 1px solid var(--border); }
.panel dl > div:first-child { border-top: 0; }
.panel dt { font-weight: 700; }
.panel dd { color: var(--sub); font-size: .95rem; margin-top: 2px; }

.flow { list-style: none; counter-reset: flow; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 8px 26px; }
.flow li { counter-increment: flow; position: relative; padding: 16px 0 16px 44px; border-top: 1px solid var(--border); }
.flow li:first-child { border-top: 0; }
.flow li::before {
  content: counter(flow);
  position: absolute; left: 0; top: 16px;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent); color: #fff; font-weight: 700; font-size: .9rem;
  display: flex; align-items: center; justify-content: center;
}
.flow strong { display: block; }
.flow span { color: var(--sub); font-size: .95rem; }

.foot { margin-top: 28px; border-top: 1px solid var(--border); padding: 28px 0 56px; color: var(--sub); font-size: .85rem; }
.foot .shell { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.foot a { color: var(--sub); }

@media (prefers-reduced-motion: no-preference) {
  .app, .btn { transition: background-color .15s, border-color .15s; }
}