/* まるよのホームページ 共通デザイン（水色と、404をあらわす黒のグラデーション） */
:root {
  --bg: #f3fafe;
  --bg2: #e6f4fc;
  --card: #ffffff;
  --ink: #17212b;
  --sub: #5a6b7a;
  --blue: #3fa9df;
  --blue-soft: #d9eefa;
  --line: #d3e5f0;
  --ok: #1f9d6b;
  --ok-soft: #dcf5ea;
  --hood: #5bb8e8;
  --face: #17212b;
  --shadow: 0 6px 24px rgba(40, 110, 160, 0.10);
}
:root[data-theme="dark"] {
  --bg: #0e141a; --bg2: #131c24; --card: #17212b; --ink: #e8eff5; --sub: #92a3b2;
  --blue: #6cc4f0; --blue-soft: #1c3445; --line: #2a3a47; --ok: #43c993; --ok-soft: #14352a;
  --face: #0b1015; --shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e141a; --bg2: #131c24; --card: #17212b; --ink: #e8eff5; --sub: #92a3b2;
    --blue: #6cc4f0; --blue-soft: #1c3445; --line: #2a3a47; --ok: #43c993; --ok-soft: #14352a;
    --face: #0b1015; --shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Sans", "Yu Gothic UI", "Meiryo", "Noto Sans JP", sans-serif;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); }

/* ---- ヘッダー（タブ） ---- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .inner {
  max-width: 960px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.brand { font-weight: 700; letter-spacing: .08em; text-decoration: none; color: var(--ink); display: flex; align-items: center; gap: 8px; }
.brand i { width: 14px; height: 14px; border-radius: 50%; background: var(--blue); display: inline-block; }
.tabs { display: flex; gap: 4px; background: var(--bg2); padding: 4px; border-radius: 999px; }
.tabs a {
  text-decoration: none; color: var(--sub); font-size: .9rem; padding: 4px 16px; border-radius: 999px;
  transition: background .2s, color .2s;
}
.tabs a:hover { color: var(--ink); }
.tabs a[aria-current="page"] { background: var(--card); color: var(--ink); box-shadow: 0 1px 4px rgba(0,0,0,.12); font-weight: 600; }

main { max-width: 960px; margin: 0 auto; padding: 0 16px 80px; }
h2.section {
  font-size: 1.25rem; margin: 64px 0 18px; display: flex; align-items: center; gap: 10px;
}
h2.section::before { content: ""; width: 6px; height: 1.2em; border-radius: 3px; background: var(--blue); }
.lead { color: var(--sub); margin-top: -8px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 18px 22px; box-shadow: var(--shadow); }

/* ---- ふわっと出てくる ---- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; transition-delay: var(--d, 0s); }
.reveal.in { opacity: 1; transform: none; }

footer.site-footer { text-align: center; color: var(--sub); font-size: .8rem; padding: 40px 16px 60px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  :root:not(.fx-on) *, :root:not(.fx-on) *::before, :root:not(.fx-on) *::after { animation: none !important; }
}
@media (max-width: 520px) {
  .brand span { display: none; }
}