:root{color-scheme:light dark;--bg: #0f1115;--fg: #e6e8eb;--muted: #9aa1ab;--accent: #5b9dff;--border: #262b33;font-family:system-ui,-apple-system,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg)}a{color:var(--accent);text-decoration:none}.app-shell{min-height:100vh;display:flex;flex-direction:column}.app-header{display:flex;align-items:center;gap:2rem;padding:1rem 1.5rem;border-bottom:1px solid var(--border)}.brand{font-weight:700;letter-spacing:.02em}.app-header nav{display:flex;gap:1rem}.app-main{flex:1;padding:1.5rem;max-width:1100px;width:100%;margin:0 auto}