:root {
  --fg: #1f2933;
  --bg: #f7f8fa;
  --accent: #2563eb;
  --border: #d9dee5;
  --danger: #dc2626;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Hiragino Sans", "Noto Sans JP", Meiryo, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.7;
  font-size: 14px;
}

/* ヘッダー */
.topbar {
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
  background: #fff; border-bottom: 1px solid var(--border);
  padding: 0.5rem 1rem;
}
.topbar .brand { font-weight: 700; }
.topbar nav a {
  margin-right: 0.75rem; text-decoration: none; color: var(--fg);
  padding: 0.2rem 0.4rem; border-radius: 4px;
}
.topbar nav a.active, .topbar nav a:hover { background: #e8eefb; color: var(--accent); }
.topbar .logout { margin-left: auto; display: flex; gap: 0.5rem; align-items: center; }

main { max-width: 1100px; margin: 0 auto; padding: 1rem; }
main.center {
  max-width: 480px; margin: 10vh auto; padding: 2rem;
  background: #fff; border: 1px solid var(--border); border-radius: 8px;
}
h1 { font-size: 1.25rem; }
h2 { font-size: 1.05rem; margin-top: 1.5rem; }
a { color: var(--accent); }

/* テーブル */
table {
  width: 100%; border-collapse: collapse; background: #fff;
  border: 1px solid var(--border); margin: 0.5rem 0 1rem;
}
th, td { border-bottom: 1px solid var(--border); padding: 0.35rem 0.6rem; text-align: left; vertical-align: top; }
th { background: #eef1f5; font-weight: 600; white-space: nowrap; }

/* フォーム */
label { display: block; margin: 0.5rem 0; }
input[type="text"], input[type="email"], input[type="password"], input[type="date"],
select, textarea {
  font: inherit; padding: 0.35rem 0.5rem; border: 1px solid var(--border);
  border-radius: 4px; background: #fff; max-width: 100%;
}
.stack input[type="text"], .stack input[type="email"], .stack input[type="password"],
.stack textarea { width: 100%; }
textarea { width: 100%; font-family: ui-monospace, Menlo, Consolas, monospace; }
button, .btn {
  font: inherit; padding: 0.35rem 0.9rem; border: 1px solid var(--border);
  border-radius: 4px; background: #fff; cursor: pointer;
  text-decoration: none; color: var(--fg); display: inline-block;
}
button:hover, .btn:hover { background: #eef1f5; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover { opacity: 0.9; }
button.link {
  border: none; background: none; color: var(--accent); padding: 0;
  cursor: pointer; text-decoration: underline;
}
form.inline { display: inline-flex; gap: 0.4rem; align-items: center; margin: 0.25rem 0.5rem 0.25rem 0; flex-wrap: wrap; }
.stack { max-width: 720px; }
.box { background: #fff; border: 1px solid var(--border); border-radius: 6px; padding: 0.75rem 1rem; margin: 0.5rem 0 1rem; }

/* 表示部品 */
.flash {
  background: #ecfdf5; border: 1px solid #a7f3d0; color: #065f46;
  padding: 0.5rem 0.75rem; border-radius: 4px;
}
.error { color: var(--danger); }
.hint { color: #6b7280; font-size: 0.85em; font-weight: 400; }
.tag-ng { color: var(--danger); font-size: 0.85em; }
.cards { display: flex; gap: 1rem; flex-wrap: wrap; margin: 1rem 0; }
.card {
  background: #fff; border: 1px solid var(--border); border-radius: 6px;
  padding: 0.75rem 1.25rem; min-width: 140px;
}
.card .num { font-size: 1.6rem; font-weight: 700; }
.preview { border: 1px solid var(--border); background: #fff; padding: 1rem; margin: 0.5rem 0; }
.rawtext {
  border: 1px solid var(--border); background: #fff; padding: 1rem; margin: 0.5rem 0;
  white-space: pre-wrap; overflow-x: auto; font-size: 12px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
}
code { background: #eef1f5; padding: 0 0.3em; border-radius: 3px; }