.bk-box { border-radius:12px; padding:16px 18px; margin:18px 0; border:1px solid #e5e7eb; background:#fff; line-height:1.8; }
.bk-box-title { font-weight:700; margin-bottom:8px; display:flex; align-items:center; gap:8px; }
.bk-box-title .icon { font-style:normal; }
.bk-box-body { color:#444; }
.bk-box-point { border-color:#f3c6da; background:#fdeef4; }
.bk-box-point .bk-box-title { color:#d6347b; }
.bk-box-info { border-color:#bfdcf3; background:#eef5fc; }
.bk-box-info .bk-box-title { color:#2f72b5; }
.bk-box-warn { border-color:#f4ce9a; background:#fff6e9; }
.bk-box-warn .bk-box-title { color:#c77b13; }
.bk-box-memo { border-color:#cfd4da; background:#f6f7f9; }
.bk-box-memo .bk-box-title { color:#5a626b; }
/* 蛍光ペン風マーカー（任意のテキストブロックで span class="bk-marker" として利用可） */
.bk-marker { background:linear-gradient(transparent 60%, #ffe08a 60%); padding:0 .1em; }
.bk-marker-pink { background:linear-gradient(transparent 60%, #ffc3da 60%); padding:0 .1em; }
.bk-marker-blue { background:linear-gradient(transparent 60%, #bfe0ff 60%); padding:0 .1em; }