:root{--bg: #0f172a;--panel: #1e293b;--text: #e2e8f0;--muted: #94a3b8;--accent: #38bdf8;--error: #f87171;--border: #334155;color-scheme:dark}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}.center{min-height:100dvh;display:grid;place-items:center;padding:1.5rem}.card{width:100%;max-width:22rem;background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:1.75rem}.card h1{margin:0 0 .25rem;font-size:1.5rem}.muted{color:var(--muted)}.error{color:var(--error);margin-top:.75rem}label{display:block;margin:1rem 0 .35rem;font-size:.85rem;color:var(--muted)}input{width:100%;padding:.6rem .7rem;border-radius:8px;border:1px solid var(--border);background:#0b1220;color:var(--text);font-size:1rem}button{width:100%;margin-top:1rem;padding:.65rem;border:0;border-radius:8px;background:var(--accent);color:#04263a;font-weight:600;font-size:.95rem;cursor:pointer}button:disabled{opacity:.6;cursor:default}button.link{background:none;color:var(--accent);font-weight:400;margin-top:.75rem}.app{min-height:100dvh;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;gap:.75rem;padding:.75rem 1.25rem;border-bottom:1px solid var(--border);background:var(--panel)}.topbar .brand{font-weight:700}.topbar .spacer{flex:1}.topbar button.link{width:auto;margin:0}.content{padding:2rem 1.5rem;max-width:60rem;width:100%;margin:0 auto}.content h1{margin-top:0}.placeholder{margin-top:1.5rem;padding:2.5rem;border:1px dashed var(--border);border-radius:12px;text-align:center;color:var(--muted)}