:root{--bg: #f4f6f9;--card: #ffffff;--border: #e1e5ea;--text: #1f2933;--muted: #7b8794;--primary: #2563eb;--primary-d: #1d4ed8;--danger: #dc2626;--internal: #b45309}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,Segoe UI,Hiragino Kaku Gothic ProN,Noto Sans JP,Meiryo,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.centered{display:flex;align-items:center;justify-content:center;min-height:100vh;flex-direction:column}.topbar{display:flex;align-items:center;gap:24px;background:#1f2933;color:#fff;padding:0 24px;height:56px}.topbar .brand{color:#fff;font-weight:700;font-size:18px}.topbar nav{display:flex;gap:18px}.topbar nav a{color:#cbd2d9}.topbar nav a:hover{color:#fff;text-decoration:none}.topbar-right{margin-left:auto;display:flex;align-items:center;gap:14px}.topbar .user{color:#e4e7eb;font-size:14px}.topbar 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