body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}
body::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 52px 52px;
  opacity: 0.22;
}
body::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 60% at 50% 45%, transparent 0%, var(--bg) 100%);
}
.card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 360px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 2rem 1.75rem;
}
.brand {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  margin-bottom: 0.35rem;
}
.brand span { color: var(--muted); }
h1 { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 0.3rem; }
.sub { font-size: 0.82rem; color: var(--muted); margin-bottom: 1.5rem; }
label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
}
input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  color: var(--fg);
  font-size: 0.9rem;
  padding: 0.6rem 0.75rem;
  font-family: var(--font-sans);
  transition: border-color 0.15s;
}
input:focus { outline: none; border-color: var(--accent); }
button {
  width: 100%;
  margin-top: 1.1rem;
  padding: 0.65rem;
  background: var(--accent);
  color: oklch(12% 0.014 250);
  font-weight: 600;
  font-size: 0.875rem;
  border: none;
  border-radius: var(--r-sm);
  cursor: pointer;
  transition: opacity 0.15s;
}
button:hover { opacity: 0.88; }
button:disabled { opacity: 0.5; cursor: progress; }
.err {
  margin-top: 0.9rem;
  font-size: 0.78rem;
  color: var(--danger);
  font-family: var(--font-mono);
  min-height: 1em;
}
.back {
  display: block;
  text-align: center;
  margin-top: 1.25rem;
  font-size: 0.76rem;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
}
.back:hover { color: var(--fg); }