.toast-msg {
            transition: opacity 0.3s ease, transform 0.3s ease;
        }
        .preview-rendered-body h1:not([class]) { font-size: 1.5rem; font-weight: 800; color: #1e3a8a; margin-top: 1rem; margin-bottom: 0.5rem; }
        .preview-rendered-body h2:not([class]) { font-size: 1.25rem; font-weight: 700; color: #1e40af; margin-top: 0.75rem; margin-bottom: 0.5rem; border-bottom: 1px solid #e2e8f0; padding-bottom: 0.25rem; }
        .preview-rendered-body h3:not([class]) { font-size: 1.1rem; font-weight: 700; color: #1e293b; margin-top: 0.5rem; margin-bottom: 0.25rem; }
        .preview-rendered-body p:not([class]) { margin-bottom: 0.5rem; line-height: 1.6; color: #334155; }
        .preview-rendered-body ul:not([class]) { list-style-type: disc; margin-left: 1.5rem; margin-bottom: 0.5rem; }
        .preview-rendered-body ol:not([class]) { list-style-type: decimal; margin-left: 1.5rem; margin-bottom: 0.5rem; }
        .preview-rendered-body table:not([class]) { width: 100%; border-collapse: collapse; margin-bottom: 1rem; }
        .preview-rendered-body table:not([class]) th, .preview-rendered-body table:not([class]) td { border: 1px solid #cbd5e1; padding: 0.5rem 0.75rem; text-align: left; }
        .preview-rendered-body table:not([class]) th { background-color: #f1f5f9; font-weight: 700; }
        .preview-rendered-body img { max-width: 100%; height: auto; border-radius: 0.5rem; margin: 0.5rem 0; }

        /* Style cho badge công thức toán có thể click sửa trực quan */
        .math-badge {
            display: inline-flex;
            align-items: center;
            padding: 2px 7px;
            margin: 1px 3px;
            border-radius: 6px;
            background-color: #f8fafc;
            border: 1px solid #cbd5e1;
            cursor: pointer;
            user-select: none;
            vertical-align: middle;
            transition: all 0.2s ease;
        }
        .math-badge:hover {
            background-color: #eef2ff;
            border-color: #6366f1;
            box-shadow: 0 1px 4px rgba(99, 102, 241, 0.25);
        }
        .math-badge-display {
            display: block;
            margin: 10px auto;
            width: fit-content;
            text-align: center;
            padding: 4px 12px;
        }
        .math-badge .math-edit-icon {
            font-size: 10px;
            color: #6366f1;
            margin-left: 5px;
            opacity: 0.6;
        }
        .math-badge:hover .math-edit-icon {
            opacity: 1;
            transform: scale(1.1);
        }
    
/* Mo panel mem khong giat layout (2026-10-08) */
.eba-wrap { display: grid; grid-template-rows: 0fr; opacity: 0; transition: grid-template-rows .35s ease, opacity .3s ease; }
.eba-wrap.open { grid-template-rows: 1fr; opacity: 1; }
.eba-inner { overflow: hidden; min-height: 0; }