:root {
  --navy: #0d2f75;
  --navy-dark: #0a2456;
  --orange: #ff8a00;
  --ink: #1c2430;
  --muted: #5a6675;
  --bg: #f7f9fc;
  --card: #ffffff;
  --line: #e3e8f0;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

.site-header {
  background: var(--navy);
  color: #fff;
  padding: 14px 20px;
}
.site-header .inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.site-header a { color: #fff; text-decoration: none; }
.brand { font-weight: 700; font-size: 1.15rem; letter-spacing: .02em; }
.brand .accent { color: var(--orange); }
.site-nav a { margin-left: 18px; font-size: .95rem; opacity: .92; }
.site-nav a:hover { opacity: 1; text-decoration: underline; }

main { max-width: 860px; margin: 0 auto; padding: 32px 20px 64px; }

.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-dark) 100%);
  color: #fff;
  border-radius: 16px;
  padding: 40px 28px;
  margin-bottom: 32px;
}
.hero h1 { font-size: 1.7rem; line-height: 1.5; margin-bottom: 12px; }
.hero h1 .accent { color: var(--orange); }
.hero p { opacity: .92; font-size: .98rem; }

.hero-points { list-style: none; margin: 18px 0 22px; padding: 0; }
.hero-points li { font-size: .96rem; opacity: .96; margin-bottom: 7px; }
.hero-points .ck { color: var(--orange); font-weight: 700; margin-right: 8px; }
.hero-note { font-size: .82rem; opacity: .78; margin-top: 14px; }

.store-btn.lg { padding: 15px 26px; font-size: 1rem; box-shadow: 0 4px 14px rgba(0,0,0,.18); }
.hero .store-btn { background: #fff; color: var(--navy); }
.hero .store-btn.play { background: #1c7a4a; color: #fff; }
.hero .store-btn:hover { opacity: .92; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 20px;
}
.card h2 { color: var(--navy); font-size: 1.2rem; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: .95rem; }

.store-links { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 14px; }
.store-btn {
  display: inline-block;
  background: var(--navy);
  color: #fff;
  text-decoration: none;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: .92rem;
  font-weight: 600;
}
.store-btn.play { background: #1c7a4a; }
.store-btn:hover { opacity: .9; }

.post-list { list-style: none; }
.post-list li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  margin-bottom: 14px;
}
.post-list a {
  display: block;
  padding: 20px 24px;
  text-decoration: none;
  color: var(--ink);
}
.post-list .post-title { color: var(--navy); font-weight: 700; font-size: 1.08rem; }
.post-list .post-meta { color: var(--muted); font-size: .85rem; margin-top: 4px; }
.post-list a:hover .post-title { text-decoration: underline; }

/* 記事ページ */
.article h1 { font-size: 1.55rem; line-height: 1.55; color: var(--navy); margin: 8px 0 6px; }
.article .post-meta { color: var(--muted); font-size: .88rem; margin-bottom: 24px; }
.article h2 {
  font-size: 1.25rem;
  color: var(--navy);
  border-left: 5px solid var(--orange);
  padding-left: 12px;
  margin: 40px 0 14px;
  line-height: 1.5;
}
.article h3 { font-size: 1.05rem; color: var(--ink); margin: 26px 0 8px; }
.article p { margin-bottom: 16px; }
.article ul, .article ol { margin: 0 0 16px 1.4em; }
.article li { margin-bottom: 6px; }
.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 20px;
  font-size: .92rem;
  background: #fff;
}
.article th, .article td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.article th { background: #eef2f9; color: var(--navy); }
.article img { max-width: 100%; height: auto; border-radius: 10px; border: 1px solid var(--line); }
.article figure { margin: 20px 0; }
.article figcaption { font-size: .85rem; color: var(--muted); text-align: center; margin-top: 6px; }
.article .point {
  background: #fff7ec;
  border: 1px solid #ffd9a8;
  border-radius: 10px;
  padding: 14px 18px;
  margin: 16px 0;
}
.article .point strong { color: #b05e00; }

.cta {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-dark) 100%);
  color: #fff;
  border-radius: 14px;
  padding: 26px 24px;
  margin-top: 44px;
}
.cta h2 { color: #fff; border: none; padding: 0; margin: 0 0 10px; font-size: 1.2rem; }
.cta h2 .accent { color: var(--orange); }
.cta p { opacity: .92; font-size: .95rem; margin-bottom: 4px; }

.breadcrumb { font-size: .85rem; color: var(--muted); }
.breadcrumb a { color: var(--muted); }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 24px 20px 40px;
  text-align: center;
  color: var(--muted);
  font-size: .85rem;
  background: #fff;
}
.site-footer a { color: var(--muted); }

@media (max-width: 600px) {
  .hero { padding: 28px 20px; }
  .hero h1 { font-size: 1.35rem; }
  .article h1 { font-size: 1.3rem; }
  .store-btn.lg { flex: 1 1 100%; text-align: center; }
}