:root{--accent: #ff7a00;--accent-weak: #ffefe3;--break-accent: #40a9ff;--break-accent-weak: #e6f7ff;--text: #222;--muted: #666;--border: #eee;--bg: #fff}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Hiragino Sans,Noto Sans JP,Yu Gothic UI,Yu Gothic,Meiryo,sans-serif;color:var(--text);background:var(--bg)}.page{min-height:100vh;display:flex;flex-direction:column}.center{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px}.app-header{display:grid;grid-template-columns:minmax(36px,1fr) auto minmax(88px,1fr);align-items:center;padding:12px 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