* { box-sizing: border-box; font-family: "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif; }
body { margin: 0; background: #f2f4f7; color: #1a1a1a; }

.center-box { max-width: 360px; margin: 12vh auto; background: #fff; padding: 28px;
  border-radius: 10px; box-shadow: 0 2px 12px rgba(0,0,0,.12); text-align: center; }
.center-box h1 { font-size: 20px; margin: 0 0 4px; }
.center-box input { display: block; width: 100%; margin: 8px 0; padding: 10px;
  font-size: 15px; border: 1px solid #bbb; border-radius: 6px; }

header { display: flex; align-items: center; gap: 16px; background: #1e3a5f; color: #fff;
  padding: 8px 16px; position: sticky; top: 0; }
header .spacer { flex: 1; }
header .muted { color: #cdd7e4; font-size: 12px; }
nav { display: flex; gap: 4px; }
nav button { background: transparent; color: #cdd7e4; border: none; padding: 8px 14px;
  font-size: 14px; cursor: pointer; border-radius: 6px; }
nav button.active { background: #fff; color: #1e3a5f; font-weight: 700; }
header > button { background: transparent; color: #cdd7e4; border: 1px solid #4a6a92;
  border-radius: 6px; padding: 5px 10px; cursor: pointer; }

main { max-width: 980px; margin: 20px auto; padding: 0 16px; }
.tab { background: #fff; border-radius: 10px; padding: 20px 24px;
  box-shadow: 0 1px 6px rgba(0,0,0,.08); }
h2 { font-size: 17px; margin-top: 0; }
.muted { color: #666; font-size: 13px; }
.row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin: 12px 0; }

button.primary { background: #1e3a5f; color: #fff; border: none; border-radius: 6px;
  padding: 9px 18px; font-size: 14px; cursor: pointer; }
button.primary:disabled { background: #9fb0c4; cursor: default; }
button.primary:hover:not(:disabled) { background: #2c5285; }

table.grid { border-collapse: collapse; margin: 12px 0; }
.grid th, .grid td { border: 1px solid #ccc; padding: 5px 10px; font-size: 13px; }
.grid th { background: #eef2f7; }

.ok { color: #0a7a2f; font-weight: 700; }
.err { color: #c00000; }
.err ul, .warn ul { margin: 4px 0; }
.warn { color: #9a6700; background: #fff8e5; border: 1px solid #e8d9a0;
  border-radius: 6px; padding: 8px 12px; margin: 10px 0; }
input[type="date"], select, input[type="file"] { padding: 6px; font-size: 14px; }
details { margin: 10px 0; font-size: 13px; }