* { box-sizing: border-box; }
body { font-family: 'Noto Sans KR', sans-serif; margin: 0; background: #f5f5f5; color: #222; }
header { background: #fff; border-bottom: 1px solid #ddd; padding: 12px 20px; font-size: 18px; font-weight: 700; }
main { max-width: 960px; margin: 20px auto; padding: 0 16px; }

.tabs { display: flex; gap: 4px; margin-bottom: 16px; }
.tabs button { padding: 10px 18px; border: 1px solid #ccc; background: #fff; cursor: pointer; border-radius: 6px 6px 0 0; }
.tabs button.active { background: #333; color: #fff; border-color: #333; }
.panel { display: none; background: #fff; border: 1px solid #ddd; border-radius: 0 6px 6px 6px; padding: 20px; }
.panel.active { display: block; }

.row { display: flex; gap: 10px; align-items: center; margin-bottom: 10px; flex-wrap: wrap; }
.row label { font-size: 13px; color: #555; min-width: 90px; }
input[type=text], input[type=number], select { padding: 6px 8px; border: 1px solid #ccc; border-radius: 4px; font-size: 14px; }
input[type=number] { width: 90px; }
button.btn { padding: 7px 16px; border: none; border-radius: 4px; background: #4a90d9; color: #fff; cursor: pointer; font-size: 14px; }
button.btn:hover { background: #3a7bc0; }
button.btn.danger { background: #d9534f; }
button.btn.ghost { background: #eee; color: #333; }
button.btn:disabled { background: #ccc; color: #888; cursor: default; }

.grid-preview { position: relative; border: 1px solid #999; background: #fafafa; margin: 12px 0; }
.grid-preview .cell { position: absolute; border: 1px solid #4a90d9; background: rgba(74,144,217,0.08); }

table.list { width: 100%; border-collapse: collapse; margin-top: 14px; font-size: 13px; }
table.list th, table.list td { border-bottom: 1px solid #eee; padding: 8px; text-align: left; }
table.list img.thumb { max-width: 60px; max-height: 60px; }

hr { border: none; border-top: 1px solid #eee; margin: 18px 0; }
.hint { font-size: 12px; color: #888; }