:root{--bg: #0a0a0f;--bg2: #12121a;--bg3: #1a1a24;--border: rgba(255,255,255,.08);--text: #e8e8f0;--text-muted: #8888a0;--accent-sleep: #7b6ff0;--accent-sleep-glow: rgba(123,111,240,.15);--accent-todo: #f97316;--accent-todo-glow: rgba(249,115,22,.12);--radius: 16px;--radius-sm: 10px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.lang-toggle{display:flex;gap:4px;background:var(--bg3);border-radius:20px;padding:3px}.lang-toggle button{background:none;border:none;color:var(--text-muted);font-size:13px;font-weight:600;padding:4px 12px;border-radius:16px;cursor:pointer;transition:all .2s}.lang-toggle button.active{background:var(--border);color:var(--text)}[data-lang-content=en],body.lang-en [data-lang-content=ja]{display:none}body.lang-en 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