/* ===========================================================================
   NLBF X - login. The only page an unauthenticated visitor ever sees (R5),
   so it is deliberately self-contained: tokens.css + this file, no shell CSS,
   no third-party request of any kind.
   =========================================================================== */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-300);
  line-height: var(--lh-normal);
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--selection-bg); color: var(--text); }

/* The gold wordmark on near-black is the whole design. One very soft radial
   bloom behind it gives the page a centre of gravity without adding chrome. */
.login {
  display: grid;
  place-items: center;
  min-height: 100dvh;
  padding:
    calc(var(--space-6) + env(safe-area-inset-top))
    calc(var(--gutter) + env(safe-area-inset-right))
    calc(var(--space-6) + env(safe-area-inset-bottom))
    calc(var(--gutter) + env(safe-area-inset-left));
  background:
    radial-gradient(
      62vmin 62vmin at 50% 34%,
      var(--accent-faint) 0%,
      transparent 72%
    );
}

.login__card {
  width: 100%;
  max-width: 23rem;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--space-6);
}

.login__logo {
  display: block;
  width: min(360px, 76vw);
  height: auto;
  margin: 0 auto;
}

.login__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin: 0;
}

/* --- fields --------------------------------------------------------------- */

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.field[hidden] { display: none; }

.field__label {
  font-size: var(--fs-200);
  font-weight: var(--fw-medium);
  color: var(--text-muted);
  letter-spacing: var(--tracking-tight);
}

.field__input {
  width: 100%;
  min-height: var(--tap-min);
  padding: 0 var(--space-3);
  font: inherit;
  font-size: var(--fs-300); /* never below 16px: iOS zooms the page otherwise */
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  /* iOS Safari paints its own inset shadow and corner radius on text inputs,
     which reads as a grey smear on a near-black surface. */
  -webkit-appearance: none;
  appearance: none;
  transition: border-color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease);
}

.field__input::placeholder { color: var(--text-faint); }

.field__input:hover { border-color: var(--border-strong); }

.field__input:focus-visible {
  outline: var(--focus-width) solid var(--focus-ring);
  outline-offset: var(--focus-offset);
  border-color: var(--accent);
  background: var(--panel-hover);
}

.field__input--code {
  font-family: var(--font-mono);
  letter-spacing: 0.4em;
  text-align: center;
}

/* Chrome paints autofilled inputs white; the inset shadow is the only way to
   keep the dark surface. */
.field__input:-webkit-autofill,
.field__input:-webkit-autofill:hover,
.field__input:-webkit-autofill:focus {
  -webkit-text-fill-color: var(--text);
  -webkit-box-shadow: 0 0 0 100px var(--panel) inset;
  caret-color: var(--text);
}

/* --- button --------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--tap-min);
  padding: 0 var(--space-5);
  font: inherit;
  font-size: var(--fs-300);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-tight);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease);
}

.btn--block { width: 100%; }

.btn--accent {
  color: var(--text-on-accent);
  background: var(--accent);
}

.btn--accent:hover { background: var(--accent-hover); }
.btn--accent:active { background: var(--accent-active); transform: translateY(1px); }

.btn:focus-visible {
  outline: var(--focus-width) solid var(--focus-ring);
  outline-offset: var(--focus-offset);
}

.btn[disabled] {
  cursor: default;
  opacity: 0.6;
  transform: none;
}

/* --- error ---------------------------------------------------------------- */

.login__error {
  margin: 0;
  padding: var(--space-3);
  font-size: var(--fs-200);
  color: var(--danger);
  background: var(--danger-bg);
  border-radius: var(--radius-sm);
}

.login__error[hidden] { display: none; }

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 1ms !important; animation-duration: 1ms !important; }
}