/* =====================================================================
   PrevCS · Auth pages — login + register (reg-log.php) and forgot/reset
   ===================================================================== */

.auth-page {
  min-height: calc(100vh - var(--header-height));
  display: grid;
  place-items: center;
  padding: 48px var(--pad-x);
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

/* Grid pattern */
.auth-page::before {
  content: "";
  position: absolute; inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--hair) 1px, transparent 1px),
    linear-gradient(to bottom, var(--hair) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, #000 30%, transparent 75%);
  opacity: .8;
}

/* Top accent glow */
.auth-page::after {
  content: "";
  position: absolute; inset: -10% -8% auto -8%; height: 60%;
  z-index: -1;
  background: radial-gradient(ellipse 50% 60% at 50% 0%, var(--accent-soft), transparent 70%);
  pointer-events: none;
}

/* Animated nebula blobs */
.auth-page > .auth-nebula {
  position: absolute; inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}
.auth-nebula__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0;
  animation: nebula-drift var(--dur, 18s) ease-in-out infinite var(--delay, 0s);
}
.auth-nebula__blob:nth-child(1) {
  width: 420px; height: 420px;
  left: -10%; top: 5%;
  background: radial-gradient(circle, var(--accent) 0%, transparent 65%);
  --dur: 20s; --delay: 0s;
  opacity: .07;
}
.auth-nebula__blob:nth-child(2) {
  width: 360px; height: 360px;
  right: -8%; top: 30%;
  background: radial-gradient(circle, oklch(0.66 0.095 130) 0%, transparent 65%);
  --dur: 25s; --delay: -8s;
  opacity: .06;
}
.auth-nebula__blob:nth-child(3) {
  width: 280px; height: 280px;
  left: 30%; bottom: 5%;
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 65%);
  --dur: 22s; --delay: -14s;
  opacity: .05;
}
@keyframes nebula-drift {
  0%   { transform: translate(0, 0) scale(1); }
  33%  { transform: translate(28px, -22px) scale(1.06); }
  66%  { transform: translate(-18px, 16px) scale(.94); }
  100% { transform: translate(0, 0) scale(1); }
}

.auth-panel {
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* segmented tabs at top */
.auth-switch {
  position: relative;
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  border: 1px solid var(--hair);
  box-shadow: var(--shadow-sm);
  align-self: center;
}
.auth-switch::before {
  content: "";
  position: absolute;
  inset: 4px auto 4px 4px;
  z-index: 0;
  width: calc((100% - 12px) / 2);
  border-radius: var(--radius-pill);
  background: var(--accent);
  box-shadow: 0 5px 16px -10px var(--accent-ring);
  pointer-events: none;
  transition:
    transform 280ms cubic-bezier(.22,1,.36,1);
}
.auth-switch.is-register::before { transform: translate3d(calc(100% + 4px), 0, 0); }
.auth-switch__option {
  position: relative;
  z-index: 1;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: var(--font-weight-medium);
  color: var(--text-muted);
  cursor: pointer;
  background: transparent;
  transition: color var(--transition-fast);
}
.auth-switch__option:hover { color: var(--text-primary); }
.auth-switch__option.is-active {
  color: #fff;
}

/* card */
.auth-card {
  padding: 32px;
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.auth-alert {
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 14.5px;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.auth-alert--error { background: var(--error-soft); color: var(--error); }
.auth-alert--success { background: var(--success-soft); color: var(--success); }

.auth-panes {
  position: relative;
  transition: height 280ms cubic-bezier(.22,1,.36,1);
}
.auth-pane { display: none; }
.auth-pane.is-active { display: block; }
.auth-pane.is-entering {
  opacity: 0;
  will-change: transform, opacity;
  transition: transform 260ms cubic-bezier(.22,1,.36,1), opacity 210ms ease;
}
.auth-pane.is-entering.from-right { transform: translate3d(16px, 0, 0); }
.auth-pane.is-entering.from-left { transform: translate3d(-16px, 0, 0); }
.auth-pane.is-entering.is-animating { opacity: 1; transform: translate3d(0, 0, 0); }
.auth-pane.is-leaving {
  position: absolute;
  inset: 0;
  display: block;
  opacity: 1;
  pointer-events: none;
  will-change: transform, opacity;
  transition: transform 220ms cubic-bezier(.4,0,.2,1), opacity 180ms ease;
}
.auth-pane.is-leaving.to-left.is-animating { opacity: 0; transform: translate3d(-14px, 0, 0); }
.auth-pane.is-leaving.to-right.is-animating { opacity: 0; transform: translate3d(14px, 0, 0); }

.auth-pane__header { margin-bottom: 22px; }
.auth-pane__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.auth-pane__header h1 {
  font-size: 30px;
  letter-spacing: -0.03em;
  font-weight: var(--font-weight-medium);
  margin-bottom: 6px;
}
.auth-pane__header h1::after {
  content: "."; color: var(--accent);
}
.auth-pane__eyebrow { color: var(--accent); }
.auth-pane__header p {
  color: var(--text-muted);
  font-size: 16px;
  max-width: 38ch;
}

/* form */
.auth-form { display: flex; flex-direction: column; gap: 14px; }

.auth-field { display: flex; flex-direction: column; gap: 6px; }
.auth-field__label {
  font-size: 13.5px;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding-left: 2px;
}
.auth-field__control {
  position: relative;
  display: flex;
  align-items: center;
}
.auth-field__icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14.5px;
  color: var(--text-muted);
  pointer-events: none;
  letter-spacing: 0;
}
.auth-field input {
  padding: 12px 14px 12px 32px;
  background: var(--bg-card-soft);
  border: 1px solid var(--hair-2);
  border-radius: var(--radius-md);
  font-size: 15.5px;
  width: 100%;
  transition:
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    background var(--transition-normal);
}
/* Sin estado de hover: los campos de texto de todo el proyecto solo
   dibujan el foco (ver styles.css). */
.auth-field input:focus {
  background: var(--bg-card);
  border-color: color-mix(in oklab, var(--accent) 65%, var(--hair-2));
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 14%, transparent);
}
.auth-field__error {
  font-size: 13px;
  color: var(--error);
  padding-left: 2px;
}

.auth-actions {
  display: flex;
  justify-content: flex-end;
  font-size: 14.5px;
}
.auth-link {
  color: var(--accent);
  font-weight: var(--font-weight-medium);
}
.auth-link:hover { text-decoration: underline; }

.auth-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 22px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-pill);
  font-size: 16px;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
  margin-top: 6px;
  box-shadow: 0 1px 0 rgba(255,255,255,.12) inset, 0 6px 16px -6px var(--accent-ring);
}
.auth-submit:hover {
  transform: translateY(-1px);
  background: var(--accent-hover);
  box-shadow: 0 1px 0 rgba(255,255,255,.12) inset, 0 12px 28px -10px var(--accent-ring);
}
.auth-submit:active { transform: translateY(0) scale(.99); }
.auth-submit--danger {
  background: var(--error);
  box-shadow: 0 1px 0 rgba(255,255,255,.12) inset, 0 6px 16px -6px color-mix(in oklab, var(--error) 45%, transparent);
}
.auth-submit--danger:hover {
  background: color-mix(in oklab, var(--error) 88%, #000);
  box-shadow: 0 1px 0 rgba(255,255,255,.12) inset, 0 12px 28px -10px color-mix(in oklab, var(--error) 55%, transparent);
}

/* footer note */
.auth-foot {
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 8px;
}
.auth-foot a { color: var(--text-primary); text-decoration: underline; text-underline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  .auth-switch::before,
  .auth-panes,
  .auth-pane {
    transition-duration: 1ms !important;
  }
}