:root{--color-primary: #1e73be;--color-primary-dark: #155a96;--color-accent: #dd9933;--color-text: #333333;--color-text-light: #666666;--color-bg: #ffffff;--color-bg-light: #f5f7fa;--color-border: #e0e0e0;--color-link: #1e73be;--color-link-hover: #155a96;--font-body: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", "メイリオ", sans-serif;--font-heading: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", "メイリオ", sans-serif;--max-width: 1200px;--content-width: 800px;--sidebar-width: 340px;--gap: 30px;--radius: 4px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-body);color:var(--color-text);background-color:var(--color-bg);line-height:1.8;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:var(--color-link);text-decoration:none;transition:color 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a{color:#8cc4ff}.cookie-accept-btn{flex-shrink:0;padding:8px 20px;background:var(--color-primary);color:#fff;border:none;border-radius:var(--radius);font-size:.85rem;cursor:pointer;white-space:nowrap;transition:background .2s}.cookie-accept-btn:hover{background:var(--color-primary-dark)}.conversation-bubble{display:flex;align-items:flex-start;gap:16px;margin:1.2em 0}.conversation-bubble.conversation-teacher{flex-direction:row-reverse}.conversation-avatar{flex-shrink:0;text-align:center;width:80px}.conversation-avatar img{width:64px;height:64px;border-radius:50%;margin:0 auto;object-fit:cover}.conversation-name{display:block;font-size:.7rem;color:var(--color-text-light);margin-top:4px;line-height:1.3}.conversation-message{position:relative;padding:14px 18px;border-radius:16px;max-width:calc(100% - 100px);line-height:1.8;flex:1;min-width:0}.conversation-message p{margin:0}.conversation-message p+p{margin-top:.6em}.conversation-student .conversation-message{background:#e8f4fd;border:1px solid #d0e4f2;border-radius:16px 16px 16px 0}.conversation-teacher .conversation-message{background:#f0f8e8;border:1px solid #d4e8c8;border-radius:16px 16px 0}@media(max-width:768px){.conversation-avatar{width:56px}.conversation-avatar img{width:48px;height:48px}.conversation-bubble{gap:10px}.conversation-message{padding:12px 14px;font-size:.92rem}.static-page{padding:20px 16px}.cookie-banner-inner{flex-direction:column;text-align:center}}