:root {
  --blue: #2667ff; --red: #dd1c1a; --offwhite: #fffaff; --dark: #00171f;
  --green: #679436; --yellow: #ffb703; --silver: #c0c0c0;
  --gray-bg: #f2f2f2; --border: #c8c8c8;
}
* { box-sizing: border-box; border-radius: 0 !important; }
html, body { margin: 0; }
body { font-family: 'Roboto', Arial, sans-serif; font-size: 14px; color: #111; background: var(--gray-bg); }
[hidden] { display: none !important; }

.topbar { background: var(--dark); color: var(--offwhite); display: flex; align-items: center;
  justify-content: space-between; padding: 8px 16px; }
.topbar .logo { height: 40px; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.topbar h1 { font-size: 18px; font-weight: 700; letter-spacing: 1px; margin: 0; }

main { padding: 16px; }
.panel { background: #fff; border: 1px solid var(--border); padding: 16px; }
.panel.narrow { max-width: 360px; margin: 40px auto; }
.panel h2 { margin: 0 0 12px; font-size: 16px; }

form label { display: block; margin-bottom: 10px; }
form input { display: block; width: 100%; margin-top: 4px; padding: 6px 8px; font: inherit; border: 1px solid var(--border); }

.btn { font: inherit; padding: 6px 12px; border: 1px solid #999; background: #e6e6e6; color: #111; cursor: pointer; }
.btn:hover { background: #dcdcdc; }
.btn.primary { border-color: var(--blue); }
.error { color: var(--red); min-height: 1em; margin: 8px 0 0; }