:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6b7280;
  --line: #e3e5e8;
  --accent: #1d4ed8;
  --accent-fg: #ffffff;
  --warn-bg: #fff7e6;
  --warn-fg: #92400e;
  --ok: #047857;
  --ng: #b91c1c;
  --panel: #f7f8fa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181d;
    --fg: #e8eaed;
    --muted: #9aa1ab;
    --line: #2c3038;
    --accent: #7aa2ff;
    --accent-fg: #12141a;
    --warn-bg: #3a2f14;
    --warn-fg: #f5d08a;
    --ok: #4ade80;
    --ng: #f87171;
    --panel: #1d2027;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans JP", Meiryo, sans-serif;
}

.wrap { max-width: 1080px; margin: 0 auto; padding: 24px 16px 64px; }
.narrow { max-width: 620px; }

h1 { font-size: 1.4rem; margin: 0 0 4px; }
h2 { font-size: 1.1rem; margin: 32px 0 8px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
p  { margin: 0 0 12px; }

a { color: var(--accent); }

.muted { color: var(--muted); font-size: .875rem; }
.pre { white-space: pre-wrap; word-break: break-word; }

nav.bar { display: flex; gap: 16px; flex-wrap: wrap; padding: 10px 0 16px; border-bottom: 1px solid var(--line); margin-bottom: 20px; }
nav.bar a { text-decoration: none; font-weight: 600; }

.banner { background: var(--warn-bg); color: var(--warn-fg); padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; font-size: .9rem; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin: 16px 0 8px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.card .n { font-size: 1.6rem; font-weight: 700; }

.table-scroll { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--panel); font-weight: 600; white-space: nowrap; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
tr:hover td { background: var(--panel); }

label { display: block; margin: 14px 0 4px; font-weight: 600; font-size: .92rem; }
input[type=text], input[type=email], input[type=number], input[type=datetime-local], select, textarea {
  width: 100%; padding: 9px 11px; font: inherit;
  color: var(--fg); background: var(--bg);
  border: 1px solid var(--line); border-radius: 8px;
}
textarea { min-height: 320px; font-family: ui-monospace, "SFMono-Regular", Consolas, "Noto Sans Mono", monospace; font-size: .86rem; line-height: 1.6; }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.row > * { flex: 1 1 140px; }

button, .btn {
  display: inline-block; padding: 9px 18px; font: inherit; font-weight: 600;
  color: var(--accent-fg); background: var(--accent);
  border: 0; border-radius: 8px; cursor: pointer; text-decoration: none;
}
.btn-sub { color: var(--fg); background: var(--panel); border: 1px solid var(--line); }

.tabs { display: flex; gap: 4px; flex-wrap: wrap; margin: 32px 0 0; border-bottom: 1px solid var(--line); }
.tab {
  padding: 8px 16px; font: inherit; font-weight: 600; font-size: .95rem;
  color: var(--muted); background: transparent;
  border: 0; border-bottom: 2px solid transparent; border-radius: 8px 8px 0 0;
  cursor: pointer;
}
.tab:hover { color: var(--fg); background: var(--panel); }
.tab[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }
.tab .count { font-weight: 400; }
.tab-panel { margin-top: 14px; }
.tab-panel[hidden] { display: none; }

.err { color: var(--ng); font-weight: 600; }
.ok  { color: var(--ok); font-weight: 600; }
.tag { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: .78rem; border: 1px solid var(--line); }
.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 20px; }

/* チェックボックス列（メルマガ作成のコピー対象など） */
.checks { margin: 8px 0 4px; }
.checks .check { display: flex; gap: 8px; align-items: flex-start; margin: 6px 0; font-weight: 400; }
.checks .check input { margin-top: 3px; }