/* --- 基本スタイル(PC向け) --- */ body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif; line-height: 1.8; color: #333; background-color: #f4f5f7; margin: 0; padding: 20px; } .container { max-width: 800px; margin: 0 auto; backgro…