:root {
  --bg: #f5f6f8;
  --fg: #1f2328;
  --muted: #656d76;
  --line: #d8dee4;
  --card: #ffffff;
  --accent: #2f6feb;
  --danger: #b42318;
  --ok: #1a7f37;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  overflow-wrap: break-word;
  font-family: system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
}
a { color: var(--accent); }
code { background: #eceef1; padding: 0 .3em; border-radius: 3px; font-size: .9em; }

.site-header {
  display: flex; align-items: center; gap: .5rem 1rem;
  flex-wrap: wrap;                      /* 狭い画面では折り返す */
  padding: .75rem 1.25rem;
  background: var(--card); border-bottom: 1px solid var(--line);
}
.site-header .brand {
  font-weight: 700; text-decoration: none; color: var(--fg);
  white-space: nowrap;
}
.site-header nav {
  display: flex; align-items: center; gap: .5rem 1rem;
  margin-left: auto; flex-wrap: wrap;
}
/* リンクが 1 文字ずつ縦に折り返されるのを防ぐ */
.site-header nav a,
.site-header nav .link-button { white-space: nowrap; }

/* ── ハンバーガーボタン（狭い画面でだけ表示） ── */
.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px; height: 44px;          /* タップしやすい大きさ */
  align-items: center; justify-content: center;
  background: none; border: 1px solid var(--line); border-radius: 8px;
  cursor: pointer; padding: 0;
}
.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block; width: 20px; height: 2px;
  background: var(--fg); border-radius: 2px;
  transition: transform .18s ease, opacity .18s ease;
}
.nav-toggle-bars { position: relative; }
.nav-toggle-bars::before,
.nav-toggle-bars::after { content: ""; position: absolute; left: 0; }
.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }
/* 開いているときは × に変える */
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }
.site-footer { text-align: center; color: var(--muted); padding: 2rem 0; }

.container { max-width: 860px; margin: 0 auto; padding: 1.5rem 1.25rem 3rem; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.1rem; margin-top: 0; }

.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 8px; padding: 1.25rem; margin-bottom: 1.25rem;
}
.form { max-width: 460px; }
.field { margin-bottom: .9rem; display: flex; flex-direction: column; gap: .3rem; }
.field.checkbox { flex-direction: row; align-items: center; gap: .4rem; }
.field label { font-size: .875rem; color: var(--muted); }
input[type=text], input[type=email], input[type=password], select {
  padding: .5rem .6rem; border: 1px solid var(--line); border-radius: 6px;
  font-size: 1rem; background: #fff; max-width: 100%;
}
.errors { color: var(--danger); font-size: .85rem; margin: .2rem 0 0; padding-left: 1.1rem; }

.btn, input[type=submit] {
  display: inline-block; padding: .5rem 1rem; border-radius: 6px;
  border: 1px solid var(--line); background: #fff; color: var(--fg);
  cursor: pointer; font-size: .95rem; text-decoration: none;
}
.btn.primary, input[type=submit] { background: var(--accent); border-color: var(--accent); color: #fff; }
.link-button {
  background: none; border: none; padding: 0; color: var(--accent);
  cursor: pointer; font-size: inherit; font-family: inherit;
}
.link-button.danger { color: var(--danger); }
form.inline { display: inline; }
.inline-form { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; margin-top: 1rem; }

.flashes { list-style: none; padding: 0; margin: 0 0 1.25rem; }
.flash { padding: .6rem .9rem; border-radius: 6px; margin-bottom: .5rem; border: 1px solid var(--line); background: #fff; }
.flash-success { border-color: #a6e0b5; background: #e9f7ee; color: var(--ok); }
.flash-danger  { border-color: #f3b7b1; background: #fdecea; color: var(--danger); }
.flash-warning { border-color: #f0d38a; background: #fdf6e3; color: #7a5c00; }
.flash-info    { border-color: #b6d4fe; background: #eaf2fe; }

/* 横スクロールできることが分かるよう、隠れている側の端に影を出す。
   background-attachment: local/scroll の組み合わせで、スクロール位置に
   応じて影が消える（JS 不要）。 */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background:
    linear-gradient(to right, var(--card) 30%, rgba(255, 255, 255, 0)) left center,
    linear-gradient(to left, var(--card) 30%, rgba(255, 255, 255, 0)) right center,
    radial-gradient(farthest-side at 0 50%, rgba(0, 0, 0, .14), rgba(0, 0, 0, 0)) left center,
    radial-gradient(farthest-side at 100% 50%, rgba(0, 0, 0, .14), rgba(0, 0, 0, 0)) right center;
  background-repeat: no-repeat;
  background-size: 28px 100%, 28px 100%, 14px 100%, 14px 100%;
  background-attachment: local, local, scroll, scroll;
}
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { font-size: .8rem; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }

.kv { display: grid; grid-template-columns: 10rem minmax(0, 1fr); gap: .25rem 1rem; margin: 0; }
.kv dt { color: var(--muted); font-size: .875rem; }
.kv dd { margin: 0; min-width: 0; overflow-wrap: anywhere; }

.badge {
  display: inline-block; padding: .1rem .55rem; margin-right: .35rem;
  border-radius: 999px; background: #eaf2fe; color: #17408c; font-size: .8rem;
  white-space: nowrap;
}
.muted { color: var(--muted); }
.field-note { font-size: .85rem; margin: -.5rem 0 1rem; }
.notice {
  border: 1px solid #f0d38a; background: #fdf6e3; color: #7a5c00;
  border-radius: 6px; padding: .7rem .9rem; margin: .5rem 0 .9rem;
  font-size: .9rem;
}
.notice code { background: rgba(0, 0, 0, .06); }
.btn.danger-btn { border-color: var(--danger); color: var(--danger); background: #fff; }
input[disabled], input[readonly] { background: #f1f2f4; color: var(--muted); }
tr.row-inactive td { color: var(--muted); background: #fafafa; }
.link-list { padding-left: 1.1rem; }

/* ── スマホ幅（600px 以下） ───────────────────────────── */
@media (max-width: 600px) {
  .site-header {
    align-items: center;
    padding: .5rem 1rem;
  }
  .nav-toggle { display: inline-flex; }

  /* JS が有効なときだけ畳む（無効なら展開したまま = 従来の見た目） */
  .js .site-header nav { display: none; }
  .js .site-header nav.is-open { display: flex; }

  /* 開いたメニューは縦一列。1 行ずつ広めに取ってタップしやすくする */
  .site-header nav {
    flex-direction: column; align-items: stretch;
    gap: 0; margin-left: 0; width: 100%;
    border-top: 1px solid var(--line); margin-top: .5rem;
  }
  .site-header nav a,
  .site-header nav .link-button {
    display: block; width: 100%; text-align: left;
    padding: .8rem .25rem;
    border-bottom: 1px solid var(--line);
  }
  .site-header nav form.inline { display: block; }
  .container { padding: 1rem 1rem 2.5rem; }
  .card { padding: 1rem; }
  /* 見出しと値を上下に並べる（横並びだと値がはみ出す） */
  .kv { grid-template-columns: 1fr; gap: 0; }
  .kv dt { margin-top: .7rem; }
  .kv dt:first-child { margin-top: 0; }
  .form { max-width: none; }
  .btn, input[type=submit] { width: 100%; text-align: center; }
  .inline-form .btn { width: auto; }
}