Janna runes/masteries help?

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I've been meaning to pick up Janna lately and I need help with runes and masteries. I'm generally ok with the playstyle but I feel I'm way too squishy in lane and tend to get focussed and taken down far too easily. I'm just using a pretty standard AP rune page which may not be a good idea. Suggestions for runes, masteries and core build please?