<form class="lf-glass" aria-label="Sign in form">
  <div class="lf-glass-bg" aria-hidden="true"></div>
  <article class="lf-glass-card">
    <header>
      <h2 class="lf-glass-title">Sign in</h2>
      <p class="lf-glass-sub">Welcome back. Continue where you left off.</p>
    </header>
    <label class="lf-glass-field">
      <span>Email</span>
      <input
        type="email"
        name="email"
        autocomplete="email"
        placeholder="[email protected]"
        required
      />
    </label>
    <label class="lf-glass-field">
      <span>Password</span>
      <input
        type="password"
        name="password"
        autocomplete="current-password"
        placeholder="••••••••"
        required
      />
    </label>
    <button type="submit" class="lf-glass-btn">Continue</button>
  </article>
</form>

.lf-glass {
  position: relative;
  isolation: isolate;
  width: 100%;
  max-width: 320px;
  border-radius: 18px;
  overflow: hidden;
}
.lf-glass-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(40% 50% at 20% 30%, #f59e0b 0%, transparent 60%),
    radial-gradient(50% 60% at 80% 70%, #7c3aed 0%, transparent 60%),
    radial-gradient(60% 70% at 50% 50%, #ef4444 0%, transparent 60%), #0a0a14;
  filter: blur(30px) saturate(120%);
  transform: scale(1.2);
}
.lf-glass-card {
  position: relative;
  z-index: 1;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  border-radius: 18px;
  padding: 26px 22px;
  display: grid;
  gap: 14px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.25),
    0 18px 48px -16px rgba(0, 0, 0, 0.5);
}
.lf-glass-card header {
  display: grid;
  gap: 4px;
}
.lf-glass-title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: #fff;
}
.lf-glass-sub {
  margin: 0;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.5;
}
.lf-glass-field {
  display: grid;
  gap: 5px;
  font-size: 11px;
  color: rgba(255, 255, 255, 0.7);
}
.lf-glass-field input {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 13px;
  color: #fff;
  outline: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15);
  transition:
    border-color 0.2s,
    background 0.2s;
}
.lf-glass-field input::placeholder {
  color: rgba(255, 255, 255, 0.45);
}
.lf-glass-field input:focus {
  border-color: rgba(255, 255, 255, 0.45);
  background: rgba(255, 255, 255, 0.14);
}
.lf-glass-btn {
  margin-top: 4px;
  padding: 11px;
  background: rgba(255, 255, 255, 0.92);
  color: #15151d;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 10px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 0.12s,
    background 0.15s;
}
.lf-glass-btn:hover {
  transform: translateY(-1px);
  background: #fff;
}