:root{--bg:#f5f7fa;--surface:#ffffff;--border:#e3e8ef;--text:#1a202c;--text-sub:#64748b;--primary:#2563eb;--primary-dark:#1d4ed8;--success:#16a34a;--warning:#d97706;--danger:#dc2626;--radius:12px}*{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%}body{font-family:-apple-system,BlinkMacSystemFont,Hiragino Sans,Noto Sans JP,Yu Gothic UI,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;font-size:15px}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:1200px;margin:0 auto;padding:16px}.container.narrow{max-width:520px}.topbar{background:var(--surface);border-bottom:1px solid var(--border);padding:10px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;position:-webkit-sticky;position:sticky;top:0;z-index:20}.topbar .brand{font-weight:700;font-size:16px;color:var(--text)}.topbar nav{display:flex;gap:4px;overflow-x:auto;-webkit-overflow-scrolling:touch}.topbar nav 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