:root {
  --bg: #f0f8fc;
  --panel: #ffffff;
  --ink: #134c6e;
  --muted: #667;
  --line: #d8e8f2;
  --accent: #4aa3d5;
  --accent-soft: #e6f4fb;
  --accent-deep: #2d7eb0;
  --warn: #c0392b;
  --warn-soft: #fde9e7;
  --ok: #1f7a4d;
  --ok-soft: #e3f5ec;
  --line-green: #06C755;
  --family: #1f7a4d;
  --light: #b58105;
  --discord: #5865F2;
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--bg); color: #222; line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

/* ハンバーガーボタン（デスクトップでは非表示） */
.toc-toggle {
  display: none;
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  background: var(--accent);
  color: #fff;
  border: 0;
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  letter-spacing: 0.04em;
  box-shadow: 0 2px 6px rgba(0,0,0,0.12);
}
.toc-toggle .bars { display: inline-block; width: 22px; font-size: 18px; }
.toc-toggle.open .bars::before { content: '✕'; }
.toc-toggle.open .bars { font-size: 16px; }

header.main {
  background:
    url('cac_logo.png') right 28px center / 110px auto no-repeat,
    linear-gradient(135deg, #5ab4e0 0%, #2d7eb0 100%);
  color: #fff;
  padding: 28px 160px 28px 28px;
  box-shadow: 0 1px 6px rgba(0,0,0,0.08);
}
header.main .crumb { font-size: 12px; letter-spacing: 0.12em; opacity: 0.92; }
header.main h1 { margin: 4px 0 0; font-size: 22px; }
header.main .meta { font-size: 12px; opacity: 0.92; margin-top: 6px; }
@media (max-width: 640px) {
  header.main {
    background:
      url('cac_logo.png') right 12px top 12px / 68px auto no-repeat,
      linear-gradient(135deg, #5ab4e0 0%, #2d7eb0 100%);
    padding-right: 92px;
  }
}

.layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: calc(100vh - 110px);
}

nav.toc {
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 20px 16px;
  position: sticky;
  top: 0;
  max-height: 100vh;
  overflow-y: auto;
}
nav.toc h3 { margin: 0 0 8px; font-size: 12px; color: var(--muted); letter-spacing: 0.1em; }
nav.toc ol { list-style: none; padding: 0; margin: 0; font-size: 13px; }
nav.toc ol li { margin: 4px 0; }
nav.toc ol li a {
  color: var(--ink);
  text-decoration: none;
  padding: 5px 8px;
  display: block;
  border-radius: 6px;
  transition: background 0.15s;
}
nav.toc ol li a:hover { background: var(--accent-soft); }
nav.toc ol li a.current { background: var(--accent); color: #fff; font-weight: 600; }
nav.toc ol li.sub { padding-left: 14px; }
nav.toc ol li.sub a { font-size: 12px; color: var(--muted); }

main { padding: 28px 32px 80px; max-width: 1024px; }

section {
  background: var(--panel);
  border-radius: 10px;
  padding: 24px 28px;
  margin-bottom: 24px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
section h2 {
  margin: 0 0 14px; color: var(--ink); font-size: 19px;
  padding-bottom: 8px; border-bottom: 2px solid var(--accent-soft);
}
section h3 { margin: 22px 0 8px; color: var(--ink); font-size: 16px; }
section h4 { margin: 16px 0 6px; color: var(--ink); font-size: 14px; }
section p { margin: 8px 0; font-size: 14px; }
section ul, section ol { margin: 6px 0; padding-left: 22px; font-size: 14px; }
section li { margin: 3px 0; }

.badge {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  font-size: 11px; font-weight: 600; letter-spacing: 0.06em;
  vertical-align: middle;
}
.badge.join { background: var(--accent-soft); color: var(--accent); }
.badge.discord { background: #eef0fe; color: var(--discord); }
.badge.change { background: #fff8e6; color: #8a6c0a; }
.badge.quit { background: #fde9e7; color: var(--warn); }
.badge.family { background: var(--ok-soft); color: var(--family); }
.badge.light { background: #fff4d5; color: var(--light); }
.badge.must { background: #fde9e7; color: var(--warn); }

.card {
  background: #fafbfd;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  margin: 10px 0;
}
.card.warn { background: var(--warn-soft); border-color: #f3b8b8; color: #6a2020; }
.card.ok { background: var(--ok-soft); border-color: #b6dec4; }

table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 13px; }
table th, table td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left; vertical-align: top;
}
table th { background: var(--accent-soft); color: var(--ink); font-weight: 600; }
table tr:nth-child(even) td { background: #fafbfd; }

code {
  background: #f1f4f9; padding: 1px 6px; border-radius: 4px;
  font-family: "SF Mono","Menlo","Consolas",monospace;
  font-size: 12px; color: #2a3a55;
}
pre {
  background: #2a3a55; color: #e3eaf2;
  padding: 14px 16px; border-radius: 8px;
  font-size: 12px; overflow-x: auto; line-height: 1.55;
  font-family: "SF Mono","Menlo",monospace;
}
a { color: var(--accent); }

.step { display: flex; align-items: center; gap: 10px; margin: 12px 0 4px; }
.step-num {
  background: var(--accent); color: #fff; border-radius: 999px;
  width: 26px; height: 26px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; flex-shrink: 0;
}
.step-title { font-weight: 600; color: var(--ink); font-size: 14px; }

.tmpl-box {
  position: relative; background: #fafbfd;
  border: 1px solid var(--line); border-radius: 8px; margin: 12px 0;
}
.tmpl-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px; border-bottom: 1px solid var(--line);
  background: #f1f4f9; border-radius: 8px 8px 0 0;
}
.tmpl-head .ttl { font-weight: 600; font-size: 13px; color: var(--ink); }
.tmpl-head button {
  background: var(--accent); color: #fff; border: 0;
  padding: 6px 14px; border-radius: 6px; cursor: pointer;
  font-size: 12px; font-weight: 600;
}
.tmpl-head button:hover { background: var(--accent-deep); }
.tmpl-head button.copied { background: var(--ok); }
.tmpl-body {
  padding: 14px 16px; white-space: pre-wrap;
  font-family: "Hiragino Sans","Yu Gothic",sans-serif;
  font-size: 13px; line-height: 1.85; color: #222;
}

.quick {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px; margin: 14px 0;
}
.quick a {
  background: var(--accent-soft); color: var(--accent);
  padding: 12px; border-radius: 8px;
  text-decoration: none; font-weight: 600; font-size: 13px;
  transition: all 0.15s;
}
.quick a:hover { background: #c6e4f3; transform: translateY(-1px); }

.pill-link {
  display: inline-block; background: var(--line-green); color: #fff;
  padding: 6px 14px; border-radius: 999px;
  text-decoration: none; font-size: 12px; font-weight: 600; margin-right: 6px;
}
.pill-link.alt { background: #fff; color: var(--accent); border: 1.5px solid var(--accent); }

details {
  background: #fafbfd; border: 1px solid var(--line);
  border-radius: 8px; padding: 8px 12px; margin: 8px 0;
}
details summary {
  cursor: pointer; font-weight: 600; color: var(--ink);
  font-size: 13px; padding: 4px 0;
}

.note { font-size: 12px; color: var(--muted); margin-top: 4px; }
.kbd {
  background: #fff; border: 1px solid var(--line); border-bottom-width: 2px;
  border-radius: 4px; padding: 1px 6px;
  font-family: monospace; font-size: 11px;
}

/* 前章 / 次章 フッターナビ */
.page-nav {
  display: flex; justify-content: space-between;
  margin-top: 40px; padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 13px;
}
.page-nav a {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--accent); text-decoration: none;
  padding: 8px 14px; border-radius: 8px;
  border: 1px solid var(--accent-soft);
  background: var(--accent-soft);
  font-weight: 600;
  transition: background 0.15s;
}
.page-nav a:hover { background: #c6e4f3; }
.page-nav .prev::before { content: '←'; }
.page-nav .next::after { content: '→'; }
.page-nav .placeholder { flex: 1; }

/* モバイル対応 */
@media (max-width: 880px) {
  html, body { overflow-x: hidden; }
  .layout { grid-template-columns: 1fr; }
  main { padding: 18px; }
  .toc-toggle { display: block; }
  nav.toc {
    position: static; padding: 14px 16px;
    max-height: 0; overflow: hidden;
    border-right: 0; border-bottom: 0;
    transition: max-height 0.25s ease;
    padding-top: 0; padding-bottom: 0;
  }
  nav.toc.toc-open {
    max-height: 70vh; overflow-y: auto;
    padding-top: 14px; padding-bottom: 14px;
    border-bottom: 2px solid var(--accent);
  }
  nav.toc ol li a { padding: 11px 12px; border-radius: 8px; }
}

@media (max-width: 640px) {
  header.main { padding: 18px 16px; }
  header.main h1 { font-size: 19px; }
  main { padding: 14px 12px 60px; }
  section { padding: 16px 14px; border-radius: 8px; margin-bottom: 16px; }
  section h2 { font-size: 17px; }
  section table {
    display: block; overflow-x: auto;
    white-space: nowrap; -webkit-overflow-scrolling: touch; font-size: 12px;
  }
  section table th, section table td {
    padding: 8px 10px; white-space: normal; min-width: 80px;
  }
  pre { font-size: 11px; padding: 12px 14px; -webkit-overflow-scrolling: touch; }
  code { font-size: 11px; padding: 1px 5px; }
  .card { padding: 12px; }
  .quick { grid-template-columns: 1fr; gap: 10px; }
  .page-nav { flex-direction: column; gap: 10px; }
  .page-nav a { justify-content: center; }
}