/**
 * io.bio Auth — design system
 * Light/dark from production liquid-glass tokens; aero = Win7 translucent brown.
 * Curated themes only — developers do not inject raw CSS.
 */

:root,
[data-theme="light"] {
  --canvas-base: #e4e9ef;
  --page-bg: var(--canvas-base);
  --canvas-mesh-1: #d8e2ec;
  --canvas-mesh-2: #eef1f5;
  --canvas-mesh-3: #f5f7fa;

  --text-primary: rgba(0, 0, 0, 0.88);
  --text-secondary: rgba(0, 0, 0, 0.55);
  --text-tertiary: rgba(0, 0, 0, 0.38);

  --glass-blur-lg: 28px;
  --glass-fill: rgba(255, 255, 255, 0.68);
  --glass-border: rgba(255, 255, 255, 0.82);
  --glass-radius-sm: 12px;
  --glass-radius-md: 20px;
  --liquid-glass-overlay-radius: 30px;
  --liquid-glass-overlay-width: min(100%, 26rem);

  --neu-shadow: rgba(163, 177, 198, 0.46);
  --neu-highlight: rgba(255, 255, 255, 0.94);
  --neu-raised:
    4px 4px 10px var(--neu-shadow),
    -4px -4px 10px var(--neu-highlight);
  --neu-raised-soft:
    0 1px 0 rgba(255, 255, 255, 0.96) inset,
    0 -1px 0 rgba(163, 177, 198, 0.05) inset,
    0 7px 16px -8px rgba(163, 177, 198, 0.34),
    0 2px 6px -3px rgba(163, 177, 198, 0.16);
  --neu-raised-soft-hover:
    0 1px 0 rgba(255, 255, 255, 0.98) inset,
    0 -1px 0 rgba(163, 177, 198, 0.05) inset,
    0 9px 20px -8px rgba(139, 156, 182, 0.38),
    0 3px 8px -3px rgba(163, 177, 198, 0.2);
  --neu-pressed:
    inset 3px 3px 8px var(--neu-shadow),
    inset -3px -3px 8px var(--neu-highlight);
  --neu-inset-well:
    inset 5px 5px 12px rgba(163, 177, 198, 0.34),
    inset -5px -5px 12px rgba(255, 255, 255, 0.78);

  --panel-bg: linear-gradient(
    168deg,
    rgba(244, 247, 251, 0.96) 0%,
    rgba(232, 239, 246, 0.91) 48%,
    rgba(240, 244, 249, 0.94) 100%
  );
  --method-bg: rgba(255, 255, 255, 0.55);
  --method-bg-hover: rgba(255, 255, 255, 0.78);
  --divider-line: rgba(163, 177, 198, 0.35);
  --input-bg: rgba(255, 255, 255, 0.5);
  --input-bg-focus: rgba(255, 255, 255, 0.72);
  --input-border: rgba(0, 0, 0, 0.06);
  --theme-accent: #0f172a;
  --theme-accent-fg: #ffffff;
  --theme-accent-soft: rgba(15, 23, 42, 0.08);
  --notice: #6d7bd9;
  --error-bg: rgba(109, 123, 217, 0.12);
  --error-fg: #5866c6;
  --snippet-bg: rgba(15, 23, 42, 0.92);
  --snippet-fg: #e2e8f0;
  --switch-off: rgba(15, 23, 42, 0.16);
  --card-bg: var(--panel-bg);

  --font-sans: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  color-scheme: light;
}

/* Production dark liquid glass */
[data-theme="dark"] {
  --canvas-base: #0b0f14;
  --canvas-mesh-1: #121820;
  --canvas-mesh-2: #0e1319;
  --canvas-mesh-3: #161c24;

  --text-primary: rgba(255, 255, 255, 0.92);
  --text-secondary: rgba(255, 255, 255, 0.62);
  --text-tertiary: rgba(255, 255, 255, 0.42);

  --glass-fill: rgba(28, 34, 42, 0.72);
  --glass-border: rgba(255, 255, 255, 0.12);

  --neu-shadow: rgba(0, 0, 0, 0.52);
  --neu-highlight: rgba(255, 255, 255, 0.07);
  --neu-raised:
    4px 4px 10px var(--neu-shadow),
    -4px -4px 10px var(--neu-highlight);
  --neu-raised-soft:
    0 1px 0 rgba(255, 255, 255, 0.1) inset,
    0 -1px 0 rgba(0, 0, 0, 0.22) inset,
    0 7px 16px -8px rgba(0, 0, 0, 0.42),
    0 2px 6px -3px rgba(0, 0, 0, 0.26);
  --neu-raised-soft-hover:
    0 1px 0 rgba(255, 255, 255, 0.12) inset,
    0 -1px 0 rgba(0, 0, 0, 0.24) inset,
    0 9px 20px -8px rgba(0, 0, 0, 0.48),
    0 3px 8px -3px rgba(0, 0, 0, 0.3);
  --neu-pressed:
    inset 3px 3px 8px var(--neu-shadow),
    inset -3px -3px 8px var(--neu-highlight);
  --neu-inset-well:
    inset 5px 5px 12px rgba(0, 0, 0, 0.42),
    inset -5px -5px 12px rgba(255, 255, 255, 0.05);

  --panel-bg: linear-gradient(
    168deg,
    rgba(36, 44, 54, 0.94) 0%,
    rgba(22, 28, 36, 0.9) 55%,
    rgba(28, 34, 42, 0.92) 100%
  );
  --method-bg: rgba(255, 255, 255, 0.06);
  --method-bg-hover: rgba(255, 255, 255, 0.11);
  --divider-line: rgba(255, 255, 255, 0.12);
  --input-bg: rgba(0, 0, 0, 0.28);
  --input-bg-focus: rgba(0, 0, 0, 0.4);
  --input-border: rgba(255, 255, 255, 0.1);
  --theme-accent: #e2e8f0;
  --theme-accent-fg: #0b0f14;
  --theme-accent-soft: rgba(226, 232, 240, 0.12);
  --error-bg: rgba(109, 123, 217, 0.22);
  --error-fg: #a8b2f0;
  --snippet-bg: rgba(0, 0, 0, 0.55);
  --snippet-fg: #e2e8f0;
  --switch-off: rgba(255, 255, 255, 0.18);
  --card-bg: var(--panel-bg);
  color-scheme: dark;
}

/* Windows 7 Aero — translucent warm brown / frosted cream */
[data-theme="aero"] {
  --canvas-base: #5a4638;
  --canvas-mesh-1: #8b7058;
  --canvas-mesh-2: #c9ae8c;
  --canvas-mesh-3: #3f3228;

  --text-primary: rgba(28, 18, 12, 0.9);
  --text-secondary: rgba(48, 32, 22, 0.68);
  --text-tertiary: rgba(48, 32, 22, 0.48);

  --glass-blur-lg: 36px;
  --glass-border: rgba(255, 240, 220, 0.55);

  --neu-shadow: rgba(62, 42, 28, 0.38);
  --neu-highlight: rgba(255, 248, 235, 0.55);
  --neu-raised:
    3px 3px 10px rgba(40, 28, 18, 0.35),
    -2px -2px 8px rgba(255, 245, 230, 0.35);
  --neu-raised-soft:
    0 1px 0 rgba(255, 250, 240, 0.7) inset,
    0 -1px 0 rgba(80, 55, 35, 0.08) inset,
    0 8px 22px -8px rgba(40, 28, 18, 0.4),
    0 2px 8px -2px rgba(40, 28, 18, 0.22);
  --neu-raised-soft-hover:
    0 1px 0 rgba(255, 250, 240, 0.85) inset,
    0 10px 26px -8px rgba(40, 28, 18, 0.45);
  --neu-pressed:
    inset 3px 3px 8px rgba(62, 42, 28, 0.35),
    inset -2px -2px 6px rgba(255, 248, 235, 0.4);
  --neu-inset-well:
    inset 4px 4px 10px rgba(80, 55, 35, 0.28),
    inset -3px -3px 8px rgba(255, 248, 235, 0.45);

  --panel-bg: linear-gradient(
    165deg,
    rgba(255, 246, 230, 0.58) 0%,
    rgba(232, 210, 180, 0.42) 45%,
    rgba(210, 185, 155, 0.48) 100%
  );
  --method-bg: rgba(255, 248, 235, 0.48);
  --method-bg-hover: rgba(255, 250, 240, 0.72);
  --divider-line: rgba(90, 60, 40, 0.22);
  --input-bg: rgba(255, 248, 235, 0.4);
  --input-bg-focus: rgba(255, 250, 240, 0.65);
  --input-border: rgba(90, 60, 40, 0.18);
  --theme-accent: #6b4423;
  --theme-accent-fg: #fff8f0;
  --theme-accent-soft: rgba(107, 68, 35, 0.14);
  --error-bg: rgba(107, 68, 35, 0.14);
  --error-fg: #6b4423;
  --snippet-bg: rgba(45, 32, 24, 0.88);
  --snippet-fg: #f5e6d3;
  --switch-off: rgba(90, 60, 40, 0.28);
  --card-bg: var(--panel-bg);
  color-scheme: light;
}

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

html, body {
  margin: 0;
  min-height: 100%;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--page-bg);
}

body {
  background:
    radial-gradient(1200px 700px at 12% -10%, var(--canvas-mesh-2), transparent 55%),
    radial-gradient(900px 600px at 100% 0%, var(--canvas-mesh-1), transparent 50%),
    radial-gradient(800px 500px at 50% 100%, var(--canvas-mesh-3), transparent 45%),
    var(--canvas-base);
}

[data-theme="aero"] body {
  background:
    linear-gradient(180deg, rgba(255, 250, 240, 0.12), transparent 40%),
    radial-gradient(900px 600px at 20% 10%, rgba(201, 174, 140, 0.55), transparent 55%),
    radial-gradient(700px 500px at 90% 80%, rgba(90, 70, 50, 0.5), transparent 50%),
    linear-gradient(145deg, #6e5644 0%, #4a3b30 45%, #3a2e26 100%);
}

a { color: inherit; }

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem 1rem 2.5rem;
}

.auth-brand-lockup {
  text-align: center;
  margin-bottom: 1.1rem;
}

.auth-brand-lockup__mark {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: 0.04em;
}

.auth-brand-lockup__mark .tm {
  font-size: 0.55em;
  vertical-align: super;
  margin-left: 0.05em;
}

.auth-brand-lockup__sub {
  margin: 0.35rem 0 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.platform-sign-in-panel {
  position: relative;
  width: var(--liquid-glass-overlay-width);
  margin-inline: auto;
  overflow: hidden;
  isolation: isolate;
  border-radius: var(--liquid-glass-overlay-radius);
  background: var(--panel-bg);
  border: 0.5px solid var(--glass-border);
  box-shadow:
    var(--neu-raised),
    0 14px 36px rgba(0, 0, 0, 0.08);
  -webkit-backdrop-filter: blur(var(--glass-blur-lg)) saturate(160%) brightness(0.98);
  backdrop-filter: blur(var(--glass-blur-lg)) saturate(160%) brightness(0.98);
  padding: 1.35rem 1.35rem 1.25rem;
}

[data-theme="aero"] .platform-sign-in-panel {
  box-shadow:
    0 0 0 1px rgba(255, 245, 230, 0.35) inset,
    0 1px 0 rgba(255, 255, 255, 0.45) inset,
    0 18px 48px rgba(30, 20, 12, 0.35);
  -webkit-backdrop-filter: blur(var(--glass-blur-lg)) saturate(140%) brightness(1.05);
  backdrop-filter: blur(var(--glass-blur-lg)) saturate(140%) brightness(1.05);
}

.platform-sign-in-panel__title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-align: center;
}

.platform-sign-in-panel__subtitle {
  margin: 0.4rem 0 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.45;
}

.platform-sign-in-panel__body {
  margin-top: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.auth-method {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.72rem 0.95rem;
  border: 0;
  border-radius: 9999px;
  background: var(--method-bg);
  box-shadow: var(--neu-raised-soft);
  color: var(--text-primary);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: box-shadow 160ms cubic-bezier(0.16, 1, 0.3, 1), background 160ms ease;
}

.auth-method:hover {
  background: var(--method-bg-hover);
  box-shadow: var(--neu-raised-soft-hover);
}

.auth-method:active { box-shadow: var(--neu-pressed); }
.auth-method:disabled { opacity: 0.45; cursor: not-allowed; }

.auth-method__icon {
  width: 1.35rem;
  height: 1.35rem;
  flex-shrink: 0;
  display: block;
}

.auth-method__icon--passkey {
  width: 1.45rem;
  height: 1.45rem;
}

.auth-method--primary {
  background: var(--theme-accent);
  color: var(--theme-accent-fg);
  justify-content: center;
}

.auth-method--primary:hover {
  filter: brightness(1.05);
  background: var(--theme-accent);
}

.auth-divider {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.65rem;
  margin: 0.35rem 0 0.15rem;
  color: var(--text-tertiary);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  height: 1px;
  background: var(--divider-line);
}

.auth-input {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border-radius: 0.85rem;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  box-shadow: var(--neu-inset-well);
  color: var(--text-primary);
  font: inherit;
  font-size: 0.95rem;
  outline: none;
}

.auth-input:focus {
  border-color: rgba(0, 0, 0, 0.12);
  background: var(--input-bg-focus);
}

.auth-footnote {
  margin: 1rem 0 0;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  line-height: 1.4;
}

.auth-error {
  margin: 0.65rem 0 0;
  padding: 0.65rem 0.75rem;
  border-radius: var(--glass-radius-sm);
  background: var(--error-bg);
  color: var(--error-fg);
  font-size: 0.82rem;
  display: none;
}

.auth-error.is-visible { display: block; }

.auth-rp {
  margin-top: 0.85rem;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.auth-rp strong { color: var(--text-primary); font-weight: 600; }

/* Legal / disclosures */
.auth-legal {
  width: min(100%, 26rem);
  margin: 1.25rem auto 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  text-align: left;
  text-wrap: pretty;
}

.auth-legal p {
  margin: 0;
  font-size: 0.72rem;
  line-height: 1.55;
  color: var(--text-tertiary);
}

.auth-legal a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.auth-legal__title {
  font-size: 0.65rem !important;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary) !important;
}

.auth-consent {
  margin-top: 0.85rem;
  font-size: 0.72rem;
  line-height: 1.45;
  color: var(--text-tertiary);
  text-align: center;
}

.auth-consent a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Dev access gate */
.dev-gate { width: min(100%, 22rem); }

.dev-gate__digits {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0.45rem;
  margin: 1.1rem auto 0;
  max-width: 17.5rem;
}

.dev-gate__digit {
  aspect-ratio: 1;
  width: 100%;
  min-width: 0;
  max-height: 2.75rem;
  padding: 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1;
  border-radius: 0.65rem;
  border: 0.5px solid var(--input-border);
  background: var(--input-bg);
  box-shadow: var(--neu-inset-well);
  color: var(--text-primary);
  -webkit-appearance: none;
  appearance: none;
}

.dev-gate__digit:focus {
  outline: 2px solid rgba(109, 123, 217, 0.35);
  outline-offset: 1px;
}

.dev-access-notice {
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 0.5px solid var(--divider-line);
  text-align: center;
}

.dev-access-notice__title {
  margin: 0;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.dev-access-notice__body {
  margin: 0.45rem 0 0;
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--text-tertiary);
}

/* Developer console */
.dev-console {
  max-width: 52rem;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.dev-console__hero { margin-bottom: 1.25rem; }

.dev-console__hero h1 {
  margin: 0.35rem 0 0;
  font-size: 1.5rem;
  letter-spacing: -0.03em;
}

.dev-console__hero p {
  margin: 0.4rem 0 0;
  color: var(--text-secondary);
  max-width: 36rem;
  line-height: 1.45;
}

.glass-card {
  background: var(--card-bg);
  border: 0.5px solid var(--glass-border);
  border-radius: var(--glass-radius-md);
  box-shadow: var(--neu-raised-soft);
  -webkit-backdrop-filter: blur(var(--glass-blur-lg)) saturate(140%);
  backdrop-filter: blur(var(--glass-blur-lg)) saturate(140%);
  padding: 1.1rem 1.15rem;
  margin-bottom: 0.85rem;
}

.glass-card h2 {
  margin: 0 0 0.65rem;
  font-size: 0.95rem;
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(9.5rem, 1fr));
  gap: 0.55rem;
}

.theme-chip {
  border: 0;
  border-radius: 0.85rem;
  padding: 0.75rem 0.65rem;
  background: var(--method-bg);
  box-shadow: var(--neu-raised-soft);
  cursor: pointer;
  font: inherit;
  text-align: left;
  color: var(--text-primary);
}

.theme-chip strong {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
}

.theme-chip span {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.72rem;
  color: var(--text-secondary);
  line-height: 1.3;
}

.theme-chip.is-selected {
  outline: 2px solid var(--theme-accent);
  outline-offset: 1px;
}

.provider-toggles {
  display: grid;
  gap: 0.45rem;
}

.provider-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.7rem 0.8rem;
  border-radius: 0.85rem;
  background: var(--method-bg);
  box-shadow: var(--neu-inset-well);
}

.provider-row__meta {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}

.provider-row__meta strong {
  font-size: 0.88rem;
  font-weight: 550;
}

.provider-row__meta span {
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.provider-row--stack {
  flex-wrap: wrap;
}

.provider-row--stack .auth-input {
  flex: 1 1 100%;
  margin-top: 0.15rem;
}

/* Switch toggles with checkmark when on */
.switch {
  position: relative;
  flex-shrink: 0;
  width: 2.85rem;
  height: 1.55rem;
  border: 0;
  border-radius: 9999px;
  background: var(--switch-off);
  box-shadow: var(--neu-inset-well);
  cursor: pointer;
  padding: 0;
  transition: background 160ms ease;
}

.switch[aria-checked="true"] {
  background: var(--theme-accent);
}

.switch__thumb {
  position: absolute;
  top: 0.18rem;
  left: 0.18rem;
  width: 1.2rem;
  height: 1.2rem;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.22);
  display: grid;
  place-items: center;
  transition: transform 160ms cubic-bezier(0.16, 1, 0.3, 1);
  color: var(--theme-accent);
  font-size: 0.65rem;
  font-weight: 700;
  line-height: 1;
}

.switch[aria-checked="true"] .switch__thumb {
  transform: translateX(1.3rem);
}

.switch__thumb .check {
  opacity: 0;
  transform: scale(0.6);
  transition: opacity 120ms ease, transform 120ms ease;
}

.switch[aria-checked="true"] .switch__thumb .check {
  opacity: 1;
  transform: scale(1);
}

.save-flash {
  display: inline-block;
  margin-left: 0.5rem;
  font-size: 0.72rem;
  color: var(--text-secondary);
  opacity: 0;
  transition: opacity 200ms ease;
}

.save-flash.is-visible { opacity: 1; }

.snippet {
  margin: 0.65rem 0 0;
  padding: 0.85rem;
  border-radius: 0.85rem;
  background: var(--snippet-bg);
  color: var(--snippet-fg);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.45;
  overflow: auto;
  white-space: pre-wrap;
}

.badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  border: 1px solid var(--input-border);
  border-radius: 9999px;
  padding: 0.15rem 0.45rem;
}

@media (prefers-reduced-motion: reduce) {
  .auth-method,
  .switch,
  .switch__thumb { transition: none; }
}