body {
  position: fixed; inset: 0; display: flex; align-items: center; justify-content: center;
  background: var(--bg-2); z-index: 100;
  opacity: 1; transition: opacity .25s;
}

.auth-box {
  background: var(--bg-1); border-radius: var(--radius-lg); padding: 32px;
  width: 100%; max-width: 440px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 16px;
}
.auth-box h1 { font-size: 1.5rem; font-weight: 700; color: var(--text-0); text-align: center; }
.auth-box p.sub { font-size: .875rem; color: var(--text-3); text-align: center; margin-top: -8px; }

.auth-tabs { display: flex; gap: 4px; background: var(--bg-0); border-radius: var(--radius); padding: 4px; }
.auth-tab { flex: 1; padding: 8px; border: none; background: none; color: var(--text-2); border-radius: var(--radius-sm); cursor: pointer; font-size: .875rem; font-weight: 500; transition: background .15s, color .15s; }
.auth-tab.active { background: var(--accent); color: #fff; }

.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: .75rem; font-weight: 600; color: var(--text-2); text-transform: uppercase; letter-spacing: .04em; }
.field input {
  background: var(--bg-0); border: 1.5px solid var(--bg-3); border-radius: var(--radius-sm);
  padding: 10px 12px; color: var(--text-0); font-size: .9375rem; outline: none; font-family: var(--font);
  transition: border-color .15s;
}
.field input:focus { border-color: var(--accent); }
.field input.error { border-color: var(--red); }

.btn { display: flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 16px; border: none; border-radius: var(--radius-sm); font-size: .9375rem; font-weight: 500; cursor: pointer; transition: background .15s, opacity .15s; font-family: var(--font); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-h); }
.btn-primary:disabled { opacity: .5; cursor: default; }
.btn-secondary { background: var(--bg-3); color: var(--text-1); }
.btn-secondary:hover { background: var(--bg-4); }
.btn-danger { background: var(--red); color: #fff; }
.btn-danger:hover { filter: brightness(1.1); }
.btn-ghost { background: none; color: var(--text-2); padding: 6px 10px; }
.btn-ghost:hover { background: var(--bg-3); color: var(--text-0); }
.btn-icon { background: none; border: none; color: var(--text-3); padding: 6px; border-radius: var(--radius-sm); cursor: pointer; display: flex; align-items: center; transition: color .15s, background .15s; }
.btn-icon:hover { color: var(--text-0); background: var(--bg-3); }
.btn-icon svg { display: block; }

.err-msg { font-size: .8125rem; color: var(--red); min-height: 18px; }