/* CSS cho sơ đồ tư duy dạng 2 cột */
.mindmap-2col * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.mindmap-2col {
    font-family: 'Times New Roman', serif;
    background: #fff;
    padding: 20px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* Tiêu đề bài */
.mindmap-2col .title-box {
    border: 3px solid #000;
    background: #000;
    color: #fff;
    text-align: center;
    padding: 10px 15px;
    margin-bottom: 20px;
    display: inline-block;
    width: auto;
    margin-left: 50%;
    transform: translateX(-50%);
}

.mindmap-2col .title-box h3 {
    font-size: 20px;
    font-weight: bold;
    text-transform: uppercase;
    margin-bottom: 3px;
    color: #fff;
}

.mindmap-2col .title-box p {
    font-size: 14px;
    font-style: italic;
    color: #fff;
}

/* Grid layout 2 cột - Desktop */
.mindmap-2col .mindmap-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-items: start;
}

/* Node boxes */
.mindmap-2col .node-box {
    border: 3px solid #000;
    background: #fff;
    margin-bottom: 20px;
}

.mindmap-2col .node-title {
    background: #000;
    color: #fff;
    padding: 10px 16px;
    font-weight: bold;
    font-size: 16px;
    text-transform: uppercase;
    text-align: center;
}

.mindmap-2col .node-content {
    padding: 12px;
}

.mindmap-2col .node-content ul {
    list-style: none;
    font-size: 15px;
    line-height: 1.6;
}

.mindmap-2col .node-content li {
    padding: 4px 0;
    border-bottom: 1px dashed #ddd;
}

.mindmap-2col .node-content li:last-child {
    border-bottom: none;
}

/* Sub boxes */
.mindmap-2col .sub-box {
    border: 2px solid #000;
    margin-top: 10px;
    background: #fff;
}

.mindmap-2col .sub-box-title {
    background: #f0f0f0;
    padding: 6px 10px;
    font-weight: bold;
    font-size: 14px;
    border-bottom: 1px solid #000;
}

.mindmap-2col .sub-box-content {
    padding: 8px 10px;
    font-size: 14px;
    line-height: 1.5;
}

.mindmap-2col .sub-box-content ul {
    list-style: none;
}

.mindmap-2col .sub-box-content li {
    padding: 3px 0;
    padding-left: 16px;
    position: relative;
}

.mindmap-2col .sub-box-content li::before {
    content: "→";
    position: absolute;
    left: 0;
    font-size: 12px;
}

/* Legend */
.mindmap-2col .legend {
    margin-top: 25px;
    padding: 15px;
    border: 2px solid #000;
    grid-column: 1 / -1;
}

.mindmap-2col .legend h3 {
    font-size: 16px;
    margin-bottom: 10px;
    text-transform: uppercase;
    font-weight: bold;
}

.mindmap-2col .legend p {
    font-size: 15px;
    line-height: 1.7;
}

/* ============================================
   MOBILE STYLES - Tablet và nhỏ hơn
   ============================================ */
@media (max-width: 768px) {
    .mindmap-2col .title-box {
        padding: 8px 12px;
        margin-bottom: 15px;
    }
    
    .mindmap-2col .title-box h3 {
        font-size: 18px;
    }
    
    .mindmap-2col .title-box p {
        font-size: 13px;
    }
    
    /* Chuyển grid sang 1 cột */
    .mindmap-2col .mindmap-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .mindmap-2col .node-box {
        margin-bottom: 15px;
    }
    
    /* Node styles - Mobile */
    .mindmap-2col .node-title {
        font-size: 15px;
        padding: 8px 12px;
    }
    
    .mindmap-2col .node-content {
        padding: 10px;
    }
    
    .mindmap-2col .node-content ul {
        font-size: 14px;
    }
    
    /* Sub box - Mobile */
    .mindmap-2col .sub-box {
        margin-top: 8px;
    }
    
    .mindmap-2col .sub-box-title {
        font-size: 13px;
        padding: 5px 8px;
    }
    
    .mindmap-2col .sub-box-content {
        padding: 7px 8px;
        font-size: 13px;
    }
    
    /* Legend - Mobile */
    .mindmap-2col .legend {
        padding: 12px;
        margin-top: 20px;
    }
    
    .mindmap-2col .legend h3 {
        font-size: 15px;
        margin-bottom: 8px;
    }
    
    .mindmap-2col .legend p {
        font-size: 14px;
    }
}

/* ============================================
   MOBILE STYLES - Điện thoại nhỏ
   ============================================ */
@media (max-width: 480px) {
    .mindmap-2col {
        padding: 12px;
    }
    
    .mindmap-2col .title-box {
        padding: 6px 10px;
    }
    
    .mindmap-2col .title-box h3 {
        font-size: 16px;
    }
    
    .mindmap-2col .title-box p {
        font-size: 12px;
    }
    
    .mindmap-2col .mindmap-grid {
        gap: 12px;
    }
    
    .mindmap-2col .node-title {
        font-size: 14px;
        padding: 7px 10px;
    }
    
    .mindmap-2col .node-content ul {
        font-size: 13px;
    }
    
    .mindmap-2col .sub-box-title {
        font-size: 12px;
    }
    
    .mindmap-2col .sub-box-content {
        font-size: 12px;
        padding: 6px;
    }
    
    .mindmap-2col .sub-box-content li {
        padding-left: 14px;
    }
    
    .mindmap-2col .sub-box-content li::before {
        font-size: 11px;
    }
    
    .mindmap-2col .legend h3 {
        font-size: 14px;
    }
    
    .mindmap-2col .legend p {
        font-size: 13px;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .mindmap-2col {
        padding: 10px;
    }
    
    .mindmap-2col .mindmap-grid {
        gap: 15px;
    }
}