:root{--bg:#0b1020;--panel:#121933;--text:#f2f5ff;--muted:#9aa4c7;--accent:#4f7cff}*{box-sizing:border-box}body{margin:0;font-family:Arial,sans-serif;background:var(--bg);color:var(--text)}.shell{display:grid;grid-template-columns:240px 1fr;min-height:100vh}.sidebar{background:var(--panel);padding:24px;border-right:1px solid rgba(255,255,255,.08)}.brand{font-size:24px;font-weight:700;margin-bottom:24px}.sidebar nav{display:flex;flex-direction:column;gap:12px}.sidebar a{color:var(--text);text-decoration:none}.content{padding:32px}p{color:var(--muted)}