:root {
  --navy: #1c3d66;
  --bar: #336699;
  --ink: #1b1f24;
  --muted: #4b5563;
  --paper: #f7f5f0;
  --card: #ffffff;
  --line: #d7d2c8;
  --accent: #8b3a2f;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  font-size: 18px;
}
a { color: var(--navy); }
img { max-width: 100%; height: auto; display: block; }
.wrap { width: min(980px, calc(100% - 32px)); margin: 0 auto; }

.site-header {
  background: #fff;
  border-bottom: 4px solid var(--bar);
  position: sticky;
  top: 0;
  z-index: 20;
  text-align: center;
}
.brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 12px 0 4px;
}
.brand a.home {
  text-decoration: none;
  color: var(--navy);
}
.brand h1, .brand .name {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: 0.01em;
}
.menu-btn {
  font: inherit;
  background: var(--navy);
  color: #fff;
  border: 0;
  border-radius: 6px;
  padding: 10px 14px;
  min-height: 44px;
  position: absolute;
  right: 16px;
  top: 12px;
}
.nav {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding-bottom: 12px;
}
.nav.open { display: flex; }
.nav a {
  text-decoration: none;
  padding: 10px 8px;
  border-radius: 6px;
  min-height: 44px;
}
.nav a:hover, .nav a[aria-current="page"] { background: #e8eef5; }

.page { padding: 28px 0 48px; }
.page h2 { color: var(--navy); margin-top: 1.4em; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px;
  margin: 16px 0;
}
.cta {
  display: inline-block;
  background: var(--accent);
  color: #fff !important;
  text-decoration: none;
  padding: 12px 16px;
  border-radius: 6px;
  min-height: 44px;
  margin: 8px 8px 8px 0;
  border: 0;
}
.gallery {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
.gallery figure {
  margin: 0;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
.gallery figcaption { padding: 8px 10px; font-size: 0.9rem; color: var(--muted); }
.dojo-list { columns: 1; }
.hero {
  background: var(--navy);
  color: #fff;
  padding: 36px 0 28px;
  text-align: center;
}
.hero h2 { margin: 0 0 8px; font-size: clamp(1.8rem, 5vw, 2.6rem); }
.kanji {
  margin: 8px 0 0;
  font-size: clamp(2.4rem, 8vw, 4rem);
  letter-spacing: 0.12em;
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", serif;
}
.book-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  align-items: start;
}
.book-cover {
  width: min(220px, 100%);
  border: 1px solid var(--line);
  background: #fff;
}
.oshima-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  align-items: center;
}
.oshima-row img { width: min(180px, 100%); justify-self: center; }
.site-footer {
  border-top: 4px solid var(--bar);
  background: #fff;
  padding: 20px 0 32px;
  font-size: 0.95rem;
  text-align: center;
}
.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 16px;
  margin-bottom: 10px;
}
.form-heading { font-size: 0.95rem; margin-bottom: 10px; font-weight: 600; }
.form.card { padding: 12px; max-width: 460px; }
.form label { font-size: 0.92rem; }
.form input, .form textarea, .form select {
  width: 100%;
  font: 15px Georgia, serif;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  margin: 4px 0 8px;
}
.form button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 6px;
  padding: 12px 16px;
  min-height: 44px;
  cursor: pointer;
}
.thread { border-left: 3px solid var(--line); padding-left: 12px; margin: 12px 0; }
.note { color: var(--muted); font-size: 0.92rem; }

@media (min-width: 760px) {
  .menu-btn { display: none; }
  .nav { display: flex; flex-direction: row; justify-content: center; flex-wrap: wrap; padding-bottom: 10px; }
  .gallery { grid-template-columns: repeat(3, 1fr); }
  .dojo-list { columns: 2; }
  .book-row { grid-template-columns: 220px 1fr; }
  .oshima-row { grid-template-columns: 1fr 200px; }
  .oshima-row img { justify-self: end; }
}
audio { width: min(100%, 420px); }

@media (min-width: 760px) {
  .menu-btn { display: none; }
  .nav { display: flex; flex-direction: row; flex-wrap: wrap; padding-bottom: 10px; }
  .gallery { grid-template-columns: repeat(3, 1fr); }
  .dojo-list { columns: 2; }
}