/* Login screen (model B "Dividido") and the entrance animation layers.
   The stage (logo side) is dark in both schemes; its colors come from brand/entrance.css. */

.signin {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(360px, 1fr);
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--color-surface);
}

/* ----- stage: the logo side ----------------------------------------------------------- */

.signin__stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-7);
  padding: var(--space-14) var(--space-10);
  background: radial-gradient(
    120% 90% at 55% 55%,
    var(--stage-center) 0%,
    var(--stage-mid) 55%,
    var(--stage-edge) 100%
  );
  color: var(--stage-ink);
}

/* Keeps the logo's place when the entrance animation takes the logo away. */
.signin__logo {
  width: min(80%, 760px);
  aspect-ratio: 4072 / 494;
}

.signin__tagline {
  color: var(--stage-ink-muted);
  font-size: 1.0625rem;
  text-align: center;
  transition: opacity 260ms ease;
}

/* ----- panel: the form side ----------------------------------------------------------- */

.signin__panel {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-14) clamp(1.75rem, 7vw, 6rem);
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
}

.signin__form,
.signin__foot {
  width: 100%;
  max-width: 400px;
  margin-inline: auto;
  transition: opacity 320ms ease, transform 420ms cubic-bezier(0.4, 0, 0.2, 1);
}

.signin__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--font-size-xl);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.signin__lead {
  margin: 0.625rem 0 2.125rem;
  color: var(--color-ink-muted);
}

.signin__label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-ink-muted);
}

.signin__field {
  position: relative;
  margin-bottom: var(--space-5);
}

.signin__field > .icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-ink-subtle);
  pointer-events: none;
}

.signin__input {
  width: 100%;
  height: 3.25rem;
  padding: 0 3rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  color: var(--color-ink);
  font-size: var(--font-size-md); /* 16px: phones do not zoom in on focus */
  transition: border-color var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
}

.signin__input::placeholder {
  color: var(--color-ink-subtle);
  opacity: 1;
}

.signin__input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 22%, transparent);
}

.signin__reveal {
  position: absolute;
  right: var(--space-2);
  top: 50%;
  transform: translateY(-50%);
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: none;
  color: var(--color-ink-subtle);
  cursor: pointer;
}

.signin__reveal:hover {
  color: var(--color-ink);
}

.signin__keep {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  margin: var(--space-1) 0 var(--space-6);
  font-size: var(--font-size-body-lg);
  color: var(--color-ink-muted);
  cursor: pointer;
}

.signin__check {
  position: relative;
  display: grid;
  place-items: center;
  width: 1.25rem;
  height: 1.25rem;
  flex: none;
}

.signin__check input {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 100%;
  margin: 0;
  border: 1px solid var(--color-ink-subtle);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  cursor: pointer;
}

.signin__check input:checked {
  border-color: var(--color-accent);
  background: var(--color-accent);
}

.signin__check .icon {
  position: absolute;
  width: 0.875rem;
  height: 0.875rem;
  stroke-width: 2.4;
  color: var(--color-surface);
  opacity: 0;
  pointer-events: none;
}

.signin__check input:checked + .icon {
  opacity: 1;
}

.signin__error {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  margin: 0 0 var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-warning-soft);
  color: var(--color-danger);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.signin__error[hidden] {
  display: none;
}

.signin__error .icon {
  width: 1.125rem;
  height: 1.125rem;
  margin-top: 0.0625rem;
}

/* Neutral on purpose: cyan stays in small details (focus ring, checkbox, the logo itself). */
.signin__submit {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  width: 100%;
  height: 3.375rem;
  border: 0;
  border-radius: var(--radius-md);
  background: var(--color-ink);
  color: var(--color-surface);
  font-size: 1.0625rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--duration-fast) ease, transform var(--duration-fast) ease;
}

.signin__submit:hover {
  opacity: 0.92;
}

.signin__submit:active {
  transform: scale(0.99);
}

.signin__submit:focus-visible {
  outline-offset: 3px;
}

.signin__submit[disabled] {
  cursor: progress;
  opacity: 0.85;
}

.signin__submit .icon {
  stroke-width: 1.8;
}

.signin__spinner {
  width: 1.125rem;
  height: 1.125rem;
  border: 2px solid color-mix(in srgb, currentColor 25%, transparent);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: signin-spin 700ms linear infinite;
}

@keyframes signin-spin {
  to {
    transform: rotate(360deg);
  }
}

.signin__foot {
  position: absolute;
  left: 0;
  right: 0;
  bottom: var(--space-8);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-inline: clamp(1.75rem, 7vw, 6rem);
  max-width: calc(400px + 2 * clamp(1.75rem, 7vw, 6rem));
  color: var(--color-ink-subtle);
  font-size: var(--font-size-caption);
}

.signin__foot .icon {
  width: 0.9375rem;
  height: 0.9375rem;
}

/* The form steps aside when the entrance animation starts. */
.signin.is-leaving .signin__form,
.signin.is-leaving .signin__foot {
  opacity: 0;
  transform: translateX(1.5rem);
}

.signin.is-leaving .signin__tagline {
  opacity: 0;
}

/* ----- phones: logo on top, form below ----------------------------------------------- */

@media (max-width: 820px) {
  .signin {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }

  .signin__stage {
    gap: var(--space-4);
    padding: var(--space-14) var(--space-6) 2.75rem;
  }

  .signin__logo {
    width: min(86%, 420px);
  }

  .signin__tagline {
    font-size: var(--font-size-body-lg);
  }

  .signin__panel {
    justify-content: flex-start;
    padding: 2.25rem var(--space-6) 5.25rem;
    border-left: 0;
    border-top: 1px solid var(--color-border);
  }

  .signin__title {
    font-size: 1.625rem;
  }

  .signin__lead {
    margin-bottom: 1.625rem;
  }

  .signin__foot {
    bottom: var(--space-7);
    padding-inline: var(--space-6);
    max-width: calc(400px + 2 * var(--space-6));
  }
}

/* ----- entrance animation layers (driven by js/entrance.js) -------------------------- */

/* Also carries the .signin class, only to inherit the stage colors of brand/entrance.css. */
.entrance {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: block;
  min-height: 0;
  overflow: hidden;
  background: none;
}

/* Dark stage that covers the login; the ring of light cuts a growing hole in it. */
.entrance__veil {
  position: absolute;
  inset: 0;
  opacity: 0;
  background: radial-gradient(
    120% 90% at 50% 50%,
    var(--stage-center) 0%,
    var(--stage-mid) 55%,
    var(--stage-edge) 100%
  );
}

.entrance__logo {
  position: absolute;
  left: 0;
  top: 0;
  margin: 0;
}

.entrance__ring {
  position: absolute;
  left: 0;
  top: 0;
  border: 2px solid var(--spark);
  border-radius: 50%;
  box-shadow: 0 0 28px 2px var(--spark-soft), inset 0 0 28px 2px var(--spark-soft),
    0 0 90px 8px var(--spark-deep);
  opacity: 0;
  pointer-events: none;
}

html.is-entering {
  overflow: hidden;
}

@media (prefers-reduced-motion: reduce) {
  .signin__form,
  .signin__foot,
  .signin__tagline {
    transition: none;
  }

  .signin__spinner {
    animation-duration: 1.6s;
  }
}