/* 最小スタイル（本格デザインはPhase 4で承認後に適用） */
:root { --brand: #282e5c; }
* { box-sizing: border-box; }
body { font-family: -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif; margin: 0; background: #f5f6fa; color: #1a1a2e; }
header.site { background: var(--brand); color: #fff; padding: 12px 16px; display: flex; align-items: center; justify-content: space-between; }
header.site .title { font-weight: 700; }
header.site a { color: #fff; text-decoration: none; font-size: 0.85rem; }
main { max-width: 880px; margin: 0 auto; padding: 16px; }
.card { background: #fff; border-radius: 8px; padding: 16px; margin: 12px 0; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
button, input[type=submit] { background: var(--brand); color: #fff; border: 0; border-radius: 6px; padding: 10px 18px; font-size: 1rem; cursor: pointer; }
input[type=text], input[type=password], input[type=date], select, textarea { width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 6px; font-size: 1rem; }
.error { color: #c0392b; font-weight: 600; }
.note { color: #666; font-size: 0.85rem; }
details.course { background: #fff; border-radius: 8px; margin: 10px 0; box-shadow: 0 1px 3px rgba(0,0,0,0.08); }
details.course > summary { padding: 14px 16px; font-weight: 700; cursor: pointer; }
.chapter { padding: 4px 16px 12px; }
.chapter h4 { margin: 8px 0 4px; color: var(--brand); }
.video-link { display: flex; justify-content: space-between; padding: 8px 10px; border-radius: 6px; text-decoration: none; color: #1a1a2e; }
.video-link:hover { background: #eef0f7; }
.video-link .done { color: #2e7d32; font-size: 0.85rem; }
video { width: 100%; background: #000; border-radius: 8px; }
table { border-collapse: collapse; width: 100%; font-size: 0.85rem; }
th, td { border: 1px solid #ddd; padding: 6px 8px; text-align: left; }
th { background: #eef0f7; }
tr.inactive td { color: #999; background: #fafafa; }
.controls { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin: 8px 0; }