:root{--bg: #0e1116;--panel: #161b22;--border: #2a313c;--text: #e6edf3;--muted: #8b949e;--accent: #3b82f6;--danger: #ef4444;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}html,body{margin:0;height:100%;background:var(--bg);color:var(--text)}a{color:var(--accent)}button{background:var(--accent);color:#fff;border:0;padding:.6rem 1rem;border-radius:6px;cursor:pointer;font-size:.95rem}button:disabled{opacity:.5;cursor:not-allowed}input{width:100%;padding:.6rem .75rem;border-radius:6px;border:1px solid var(--border);background:#0d1117;color:var(--text)}.card{background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:1.5rem}.center{display:flex;min-height:100vh;align-items:center;justify-content:center}.field{margin-bottom:1rem}.label{display:block;margin-bottom:.35rem;color:var(--muted);font-size:.85rem}.error{color:var(--danger);font-size:.9rem;margin-top:.5rem}.muted{color:var(--muted)}