* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: radial-gradient(circle at 50% 0%, #1f2840, #0f1420 60%); color: #e8ecf4;
  font: 15px/1.45 Inter, "Segoe UI", system-ui, sans-serif; }
body { display: grid; place-items: center; min-height: 100vh; padding: 16px; }
form { width: min(380px, 100%); background: #171d2b; border: 1px solid #2a3347; border-radius: 18px; padding: 30px 26px; text-align: center; box-shadow: 0 20px 60px rgba(0,0,0,.5); }
h1 { margin: 14px 0 2px; font-size: 22px; letter-spacing: -.02em; }
p { margin: 0 0 22px; color: #9aa5bb; }
label { display: block; text-align: left; font-size: 13px; color: #9aa5bb; margin-bottom: 14px; }
input { display: block; width: 100%; margin-top: 6px; padding: 12px; border-radius: 10px; border: 1px solid #2a3347; background: #0f1420; color: inherit; font: inherit; }
input:focus { outline: 2px solid #7c5cff; }
button { width: 100%; margin-top: 6px; padding: 12px; border: 0; border-radius: 10px; background: #7c5cff; color: #fff; font: inherit; font-weight: 700; cursor: pointer; }
output { display: block; min-height: 22px; margin-top: 12px; color: #ffb0b0; font-size: 14px; }