:root{--fg:#1a1a1a;--muted:#666;--border:#d9d9d9;--bg:#fff;--accent:#0b63c5;--error:#b3261e;--ok:#1e7b34}*{box-sizing:border-box}body{margin:0;font-family:system-ui,sans-serif;color:var(--fg);background:var(--bg)}main{margin:0 auto;padding:16px 24px}table{border-collapse:collapse;width:100%}td,th{border-bottom:1px solid var(--border);padding:6px 8px;text-align:left;vertical-align:top}button,input,select,textarea{font:inherit;padding:4px 8px}.error{color:var(--error)}.muted{color:var(--muted)}.row-invalid{background:#fdecea}nav{display:flex;gap:16px;padding:12px 16px;border-bottom:1px solid var(--border)}