:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #07111f;
  color: #e7edf6;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 1.25rem;
  background:
    radial-gradient(circle at top, rgba(38, 142, 255, 0.18), transparent 38rem),
    #07111f;
}

.auth-card {
  width: min(100%, 25rem);
  padding: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 1.25rem;
  background: rgba(13, 27, 46, 0.94);
  box-shadow: 0 1.5rem 4rem rgba(0, 0, 0, 0.35);
}

.brand-mark {
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  margin-bottom: 1rem;
  border-radius: 0.9rem;
  background: #268eff;
  color: white;
  font-size: 2rem;
  font-weight: 700;
}

h1 { margin: 0; font-size: 1.65rem; }
.auth-subtitle, .auth-note { color: #aab8ca; line-height: 1.5; }
.auth-note { margin: 1.25rem 0 0; font-size: 0.88rem; }

form { display: grid; gap: 0.65rem; margin-top: 1.4rem; }
label { margin-top: 0.35rem; font-weight: 600; }

input {
  width: 100%;
  padding: 0.8rem 0.9rem;
  border: 1px solid #3a4c63;
  border-radius: 0.7rem;
  background: #091725;
  color: #f4f7fb;
  font: inherit;
}

input:focus { outline: 2px solid #268eff; outline-offset: 2px; }

.otp-fieldset {
  min-width: 0;
  margin: 0.35rem 0 0;
  padding: 0;
  border: 0;
}

.otp-fieldset legend {
  margin-bottom: 0.65rem;
  font-weight: 600;
}

.otp-group {
  display: flex;
  flex-flow: row nowrap;
  justify-content: center;
  width: 100%;
  gap: 0.5rem;
}

.otp-digit {
  flex: 1 1 0;
  width: 0;
  max-width: 3rem;
  min-width: 0;
  height: 3.25rem;
  padding: 0.35rem 0;
  text-align: center;
  font-size: clamp(1.15rem, 5vw, 1.45rem);
  font-weight: 700;
  caret-color: #82baff;
}

.otp-digit:not(:placeholder-shown) { border-color: #58718f; }

button {
  margin-top: 0.75rem;
  padding: 0.85rem 1rem;
  border: 0;
  border-radius: 0.7rem;
  background: #268eff;
  color: white;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

button:hover { background: #1579df; }

.auth-error {
  padding: 0.8rem 0.9rem;
  border: 1px solid rgba(255, 99, 99, 0.45);
  border-radius: 0.7rem;
  background: rgba(160, 27, 27, 0.22);
  color: #ffc5c5;
}

.auth-link {
  display: inline-block;
  margin-top: 1.25rem;
  color: #82baff;
}

@media (max-width: 25rem) {
  .auth-card { padding: 1.5rem; }
  .otp-group { gap: 0.35rem; }
  .otp-digit {
    max-width: 2.65rem;
    height: 3rem;
  }
}