* { box-sizing: border-box; font-family: 'Libre Baskerville', 'Noto Serif SC', serif; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: hsl(0 0% 0%);
  color: hsl(0 0% 95%);
}
.core-card {
  width: min(100%, 360px);
  padding: 8px 0;
  text-align: center;
}
.core-header { display: flex; align-items: center; justify-content: center; gap: 10px; }
.core-icon { width: 28px; height: 28px; object-fit: contain; }
h1 { margin: 0; font-size: 18px; font-weight: 300; letter-spacing: .05em; color: rgba(248,248,248,.9); }
.core-hint { max-width: 85%; margin: 14px auto 0; color: rgba(248,248,248,.4); font-size: 11px; line-height: 1.7; }
.core-form { max-width: 85%; margin: 18px auto 0; display: grid; gap: 12px; }
.input-field {
  width: 100%; padding: 12px 16px; border: 1px solid rgba(255,255,255,.1); border-radius: 8px;
  outline: none; background: rgba(255,255,255,.05); color: rgba(248,248,248,.9); text-align: center;
  font: inherit; font-size: 14px; letter-spacing: 2px; transition: all .3s;
}
.input-field:focus { border-color: rgba(255,255,255,.3); background: rgba(255,255,255,.08); }
.input-field::placeholder { color: rgba(248,248,248,.3); letter-spacing: normal; }
.core-button {
  position: relative; overflow: hidden; padding: 12px 16px; border: 1px solid rgba(255,255,255,.02);
  border-radius: 8px; background: linear-gradient(160deg, #1a1a1a 0%, #0d0d0d 30%, #262626 50%, #050505 70%, #1f1f1f 100%);
  color: rgba(248,248,248,.75); cursor: pointer; font: inherit; font-size: 13px; transition: all .3s ease;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.02), 0 4px 15px rgba(0,0,0,.3);
}
.core-button:hover { background: linear-gradient(160deg, #262626 0%, #121212 30%, #333 50%, #0a0a0a 70%, #2a2a2a 100%); transform: translateY(-1px); }
.core-button:disabled { opacity: .55; cursor: wait; }
.core-error { min-height: 16px; margin: 0; color: rgba(255,100,100,.9); font-size: 11px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }