:root{--fg: #1a1a1a;--muted: #666;--border: #e2e2e2;--warn: #a15c00;--accent: #1657c8;font-family:system-ui,-apple-system,Segoe UI,Hiragino Kaku Gothic ProN,Noto Sans JP,sans-serif;color:var(--fg)}body{margin:0}.site-header{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.75rem 1.25rem;border-bottom:1px solid var(--border)}.brand{font-weight:700;text-decoration:none;color:var(--fg)}.account{display:flex;align-items:center;gap:.75rem;font-size:.9rem}.account .mail{color:var(--muted)}.account .warn{color:var(--warn)}.account form{margin:0}.site-main{padding:1.5rem 1.25rem;max-width:960px}a{color:var(--accent)}