/**
 * PIE login — premium shell (theme.js + index.css tokens, light & dark)
 * Goals: clear tab hierarchy, grid-aligned content, refined type + surfaces.
 */

.auth-page {
  --auth-radius-card: 1.125rem;
  --auth-radius-input: 0.625rem;
  --auth-tab-h: 2.75rem;
  min-height: 100vh;
  margin: 0;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1.25rem, 4vw, 2.5rem);
  font-family: var(--font-sans, 'Inter', system-ui, sans-serif);
  color: var(--color-text-primary);
  overflow-x: hidden;
}

/* Ambient canvas: depth without clutter */
[data-theme='light'] .auth-page {
  background:
    radial-gradient(120% 80% at 50% -20%, color-mix(in srgb, var(--color-accent-base) 14%, #f0f4fb) 0%, transparent 55%),
    radial-gradient(90% 60% at 100% 100%, color-mix(in srgb, var(--color-accent-base) 8%, #e8ecf4) 0%, transparent 45%),
    linear-gradient(165deg, #f6f8fc 0%, #eef1f8 48%, #e4e9f2 100%);
}

[data-theme='dark'] .auth-page {
  background:
    radial-gradient(100% 70% at 50% 0%, color-mix(in srgb, var(--color-accent-base) 18%, #0c121c) 0%, transparent 50%),
    radial-gradient(80% 50% at 100% 100%, color-mix(in srgb, var(--color-accent-base) 10%, #0a0f16) 0%, transparent 45%),
    linear-gradient(165deg, #0a0e14 0%, #0d1219 40%, #0a0d12 100%);
}

.auth-bg-pattern {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.35;
  background:
    radial-gradient(ellipse 70% 55% at 30% 20%, color-mix(in srgb, var(--color-accent-base) 22%, transparent), transparent 60%),
    repeating-linear-gradient(
      -12deg,
      transparent 0,
      transparent 11px,
      color-mix(in srgb, var(--color-text-primary) 4%, transparent) 11px,
      color-mix(in srgb, var(--color-text-primary) 4%, transparent) 12px
    );
  mask-image: radial-gradient(ellipse 95% 85% at 50% 45%, black 0%, transparent 72%);
}

[data-theme='light'] .auth-bg-pattern {
  opacity: 0.22;
}

.auth-main {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 26.5rem;
  display: flex;
  align-items: center;
}

.auth-card-v2 {
  position: relative;
  width: 100%;
  border-radius: var(--auth-radius-card);
  border: 1px solid var(--color-border-subtle);
  background: var(--color-bg-elevated);
  box-shadow:
    0 0 0 1px color-mix(in srgb, var(--color-text-primary) 4%, transparent),
    0 2px 4px color-mix(in srgb, var(--color-text-primary) 4%, transparent),
    0 24px 56px -12px color-mix(in srgb, var(--color-text-primary) 18%, transparent),
    0 12px 32px color-mix(in srgb, var(--color-accent-base) 8%, transparent);
  overflow: hidden;
}

@supports (backdrop-filter: blur(12px)) {
  [data-theme='light'] .auth-card-v2 {
    background: color-mix(in srgb, var(--color-bg-elevated) 92%, transparent);
    backdrop-filter: blur(16px) saturate(1.2);
  }
}

/* Thin brand accent — reads “finished product” */
.auth-card-accent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    color-mix(in srgb, var(--color-accent-base) 55%, transparent),
    var(--color-accent-base),
    color-mix(in srgb, var(--color-accent-base) 40%, #1e3a5f)
  );
  pointer-events: none;
}

/* Tabs: active is visually dominant; Sign up recedes */
.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  min-height: var(--auth-tab-h);
  padding: 0.35rem 0.35rem 0;
  gap: 0.2rem;
  background: color-mix(in srgb, var(--color-bg-base) 88%, transparent);
  border-bottom: 1px solid var(--color-border-subtle);
}

.auth-tab {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  margin: 0;
  padding: 0.5rem 0.35rem;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  color: var(--color-text-tertiary);
  background: transparent;
  border-radius: 0.45rem 0.45rem 0 0;
  transition:
    color 0.18s ease,
    background 0.18s ease,
    box-shadow 0.18s ease;
}

.auth-tab:hover:not(.auth-tab--disabled):not(.auth-tab--active) {
  color: var(--color-text-secondary);
  background: color-mix(in srgb, var(--color-bg-elevated) 70%, transparent);
}

/* Active tab: strongest surface + indicator */
.auth-tab--active {
  color: var(--color-text-primary);
  font-weight: 700;
  background: var(--color-bg-elevated);
  box-shadow:
    0 -1px 0 var(--color-bg-elevated),
    0 1px 0 color-mix(in srgb, var(--color-border-subtle) 80%, transparent);
  position: relative;
}

.auth-tab--active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 18%;
  right: 18%;
  height: 2px;
  border-radius: 2px;
  background: var(--color-accent-base);
}

/* Sign up: muted — must not compete with active */
.auth-tab--muted {
  color: var(--color-text-tertiary);
  opacity: 0.72;
  font-weight: 500;
}

.auth-tab--disabled {
  cursor: not-allowed;
  pointer-events: none;
}

a.auth-tab.auth-tab--link {
  color: var(--color-text-secondary);
  font-weight: 600;
}

a.auth-tab.auth-tab--link:hover {
  color: var(--color-accent-base);
  background: color-mix(in srgb, var(--color-accent-base) 8%, transparent);
}

.auth-card-body {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.75rem 1.75rem 1.5rem;
}

@media (min-width: 480px) {
  .auth-card-body {
    padding: 2rem 2.125rem 1.625rem;
  }
}

/* Brand row — baseline grid */
.auth-brand {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 1rem 1rem;
  margin-bottom: 1.625rem;
  padding-bottom: 1.375rem;
  border-bottom: 1px solid var(--color-border-subtle);
}

.auth-brand-mark {
  width: 3rem;
  height: 3rem;
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--color-accent-base) 10%, var(--color-bg-base));
  border: 1px solid color-mix(in srgb, var(--color-border-subtle) 90%, transparent);
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--color-text-primary) 5%, transparent);
}

.auth-brand-mark img {
  width: 40px;
  height: 40px;
  display: block;
}

.auth-brand-text {
  min-width: 0;
}

.auth-brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--color-text-primary);
}

.auth-brand-sub {
  margin-top: 0.2rem;
  font-size: var(--text-sm, 0.875rem);
  font-weight: 500;
  color: var(--color-text-tertiary);
  line-height: 1.45;
}

/* Form column — single rhythm */
.auth-form-stack {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.auth-panel-head {
  margin: 0;
}

.auth-panel-title {
  margin: 0;
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.2;
  color: var(--color-text-primary);
}

.auth-panel-rule {
  margin-top: 0.65rem;
  width: 2.75rem;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--color-accent-base), color-mix(in srgb, var(--color-accent-base) 35%, transparent));
}

.auth-panel-lead {
  margin: -0.25rem 0 0;
  font-size: var(--text-sm, 0.875rem);
  line-height: 1.55;
  color: var(--color-text-secondary);
}

.auth-label-caps {
  font-size: 0.6875rem !important;
  font-weight: 600 !important;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary) !important;
  margin-bottom: 0.45rem !important;
}

.auth-field-wrap {
  margin-bottom: 0 !important;
}

.auth-input-shell {
  position: relative;
  display: block;
}

.auth-field-wrap .form-field-input {
  width: 100%;
  box-sizing: border-box;
  min-height: 3rem;
  padding: 0.65rem 2.75rem 0.65rem 0.95rem;
  border-radius: var(--auth-radius-input);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  background: var(--color-bg-base);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-primary);
  transition:
    border-color 0.15s ease,
    box-shadow 0.15s ease,
    background 0.15s ease;
}

.auth-field-wrap .form-field-input:hover {
  border-color: color-mix(in srgb, var(--color-accent-base) 35%, var(--color-border-subtle));
}

.auth-field-wrap .form-field-input:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--color-accent-base) 65%, var(--color-border-subtle));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent-base) 22%, transparent);
}

[data-theme='light'] .auth-field-wrap .form-field-input {
  background: color-mix(in srgb, var(--color-bg-base) 94%, #fff);
}

.auth-input-shell .auth-field-icon {
  position: absolute;
  right: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1.15rem;
  height: 1.15rem;
  opacity: 0.4;
  pointer-events: none;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-btn-primary {
  width: 100%;
  margin-top: 0.25rem;
  min-height: 3rem;
  padding: 0.75rem 1.125rem;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 0;
  border-radius: var(--auth-radius-input);
  cursor: pointer;
  color: #fff;
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--color-accent-base) 95%, #fff) 0%,
    var(--color-accent-base) 48%,
    color-mix(in srgb, var(--color-accent-base) 82%, #0f172a) 100%
  );
  box-shadow:
    0 1px 0 color-mix(in srgb, #fff 22%, transparent),
    0 8px 20px -4px color-mix(in srgb, var(--color-accent-base) 45%, transparent);
  transition: filter 0.15s ease, transform 0.12s ease;
}

.auth-btn-primary:hover {
  filter: brightness(1.05);
}

.auth-btn-primary:active {
  transform: translateY(1px);
  filter: brightness(0.98);
}

.auth-secondary {
  margin: 0 !important;
  font-size: var(--text-sm, 0.875rem);
  line-height: 1.55;
  text-align: left;
}

.auth-secondary a {
  font-weight: 600;
}

.auth-msg {
  font-size: var(--text-sm, 0.875rem);
  margin-top: 0.75rem;
  min-height: 1.35rem;
  text-align: left;
}

.auth-footer-note {
  margin-top: 1.75rem;
  padding-top: 1.375rem;
  margin-bottom: 0;
  border-top: 1px solid var(--color-border-subtle);
  text-align: left;
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-text-tertiary);
  line-height: 1.5;
}

/* Disabled / callout blocks keep index.css; tighten spacing */
#auth-disabled.callout {
  margin-bottom: 1rem;
}

#auth-forms {
  display: flex;
  flex-direction: column;
}