:root{color-scheme:dark;--bg: #0f1115;--panel: #181b22;--border: #262b36;--text: #e6e9ef;--muted: #9aa4b2;--accent: #4c8bf5;--error: #ff6b6b;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}.app{max-width:820px;margin:0 auto;padding:2rem 1.25rem}.app__header{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);padding-bottom:1rem;margin-bottom:1.5rem}.app__header h1{font-size:1.4rem;margin:0}.app__main{display:flex;flex-direction:column;gap:1rem;align-items:flex-start}.muted{color:var(--muted);margin:0}.btn{background:var(--accent);color:#fff;border:none;border-radius:8px;padding:.6rem 1.1rem;font-size:.95rem;cursor:pointer}.btn:disabled{opacity:.6;cursor:default}.btn--ghost{background:transparent;border:1px solid var(--border);color:var(--text)}.panel{width:100%;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:1rem;overflow-x:auto;font-size:.85rem;margin:0}.panel--error{border-color:var(--error);color:var(--error)}