:root { --bg:#f4f6f8; --surface:#fff; --line:#d8e0e8; --text:#172033; --muted:#64748b; --blue:#2f80ed; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text); font-family: Arial, Helvetica, sans-serif; letter-spacing: 0; }
main { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.panel { width: min(760px, 100%); background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 22px; box-shadow: 0 18px 42px rgba(25,35,50,.1); }
h1, p { margin: 0; }
h1 { font-size: 28px; }
p { margin-top: 6px; color: var(--muted); }
form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 22px; }
label { display: grid; gap: 6px; color: var(--muted); font-size: 12px; font-weight: 700; }
.wide { grid-column: 1 / -1; }
input, select, textarea, button { width: 100%; border: 1px solid var(--line); border-radius: 6px; padding: 10px 12px; background: white; color: var(--text); font: inherit; }
button { grid-column: 1 / -1; background: var(--blue); border-color: var(--blue); color: white; font-weight: 800; cursor: pointer; }
#result { margin-top: 16px; min-height: 24px; color: var(--muted); }
#result strong { color: var(--text); }
@media (max-width: 680px) { form { grid-template-columns: 1fr; } }