/* =============================================================================
   FERN HEADER CLONE — component styles
   Selectors and values lifted from Fern's compiled CSS on signalwire.com/docs,
   plus SignalWire's custom product-selector styling (fern/styles.css).
   Trimmed to what the header actually uses.
   ============================================================================= */

/* --- Header shell --- */
#fern-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 30;
  background-color: var(--header-background);
  border-bottom: 1px solid var(--grayscale-a3);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.fern-header-content {
  height: var(--header-height);
  padding-inline: var(--page-padding);
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
}

.fern-header-logo-container {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing) * 2);
  min-width: fit-content;
  height: 100%;
  flex: 1 0 0;
}

a[data-fern-logo] {
  display: flex;
  align-items: center;
  width: fit-content;
  flex-shrink: 0;
  text-decoration: none;
}

a[data-fern-logo] img {
  height: 25px;
  width: auto;
  display: block;
}

.fern-logo-text {
  font-family: var(--font-heading), sans-serif;
  font-weight: 500;
  font-size: 1.25rem;
  color: var(--grayscale-12);
  letter-spacing: -0.01em;
  position: relative;
  top: -1px;
  margin-left: calc(var(--spacing) * 1);
}

.fern-header-selectors {
  display: flex;
  align-items: baseline;
}

.fern-header-center {
  width: 100%;
  max-width: var(--content-width);
  display: flex;
  gap: calc(var(--spacing) * 2);
}

.fern-header-navbar-links {
  flex: 1;
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

/* --- Buttons (fern-button: minimal / outlined) --- */
.fern-button {
  appearance: none;
  background: transparent;
  border: 0;
  font: inherit;
  border-radius: calc(var(--radius) * 2);
  font-size: var(--text-sm);
  height: calc(var(--spacing) * 8);
  padding-block: calc(var(--spacing) * 1);
  padding-inline: calc(var(--spacing) * 3);
  display: inline-flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  text-decoration: none;
  transition-property: color, background-color, border-color, box-shadow;
  transition-duration: 0.15s;
  white-space: nowrap;
}

.fern-button svg {
  height: calc(var(--spacing) * 4);
  width: calc(var(--spacing) * 4);
  flex-shrink: 0;
}

.fern-button:has(> .fern-button-content > svg:last-child) {
  padding-right: calc(var(--spacing) * 2);
}

.fern-button > .fern-button-content {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--spacing) * 1.5);
  height: calc(var(--spacing) * 6);
}

.fern-button.minimal {
  color: var(--grayscale-a11);
}

.fern-button.minimal:hover {
  color: var(--grayscale-12);
  background-color: var(--grayscale-a3);
}

.fern-button.minimal[data-state="open"] {
  background-color: var(--grayscale-a3);
}

.fern-button.outlined {
  color: var(--grayscale-12);
  box-shadow: inset 0 0 0 1px var(--grayscale-a5);
}

.fern-button.outlined:hover,
.fern-button.outlined[data-state="open"] {
  background-color: var(--grayscale-a3);
}

.fern-button-group {
  display: inline-flex;
  align-items: center;
}

.fern-button-group > .fern-button.outlined:has(+ .fern-button.minimal),
.fern-button-group > .fern-button:has(+ .fern-button.outlined) {
  margin-right: calc(var(--spacing) * 2);
}

/* Icon-only button (theme toggle) */
.fern-icon-button {
  appearance: none;
  background: transparent;
  border: 0;
  border-radius: calc(var(--radius) * 2);
  width: calc(var(--spacing) * 9);
  height: calc(var(--spacing) * 9);
  margin-left: calc(var(--spacing) * 2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--grayscale-a11);
  transition: color 0.15s, background-color 0.15s;
}

.fern-icon-button svg {
  width: calc(var(--spacing) * 4);
  height: calc(var(--spacing) * 4);
}

.fern-icon-button:hover,
.fern-icon-button[data-state="open"] {
  background-color: var(--accent-a3);
  color: var(--accent-11);
}

/* Chevron rotation on open dropdowns */
.animate-dropdown-chevron {
  transition: rotate 0.25s;
}

[data-state="open"] .animate-dropdown-chevron {
  rotate: 180deg;
}

/* --- Dropdown menus (fern-dropdown) --- */
.fern-dropdown {
  position: fixed;
  z-index: 50;
  display: none;
  flex-direction: column;
  background-color: var(--background);
  border: 1px solid var(--grayscale-a5);
  border-radius: calc(var(--radius) * 2);
  box-shadow: 0 20px 25px -5px #0000001a, 0 8px 10px -6px #0000001a;
  padding: calc(var(--spacing) * 1);
  min-width: 11rem;
  max-height: calc(100dvh - var(--header-height) - 2rem);
  overflow-y: auto;
  transform-origin: top;
}

.fern-dropdown[data-state="open"] {
  display: flex;
  animation: dropdown-expand 0.15s ease-out;
}

@keyframes dropdown-expand {
  from { opacity: 0; transform: scale(0.96) translateY(-4px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.fern-dropdown .fern-dropdown-item {
  appearance: none;
  background: transparent;
  border: 0;
  font: inherit;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: var(--text-sm);
  padding-block: calc(var(--spacing) * 1);
  padding-inline: calc(var(--spacing) * 2);
  text-align: left;
  display: flex;
  align-items: center;
  width: 100%;
  color: var(--grayscale-12);
  text-decoration: none;
  outline: none;
}

.fern-dropdown .fern-dropdown-item:hover,
.fern-dropdown .fern-dropdown-item[data-highlighted] {
  background-color: var(--accent);
  color: var(--accent-contrast);
}

.fern-dropdown .fern-dropdown-item .fern-dropdown-item-indicator {
  width: calc(var(--spacing) * 4);
  height: 100%;
  margin-right: calc(var(--spacing) * 1);
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.fern-dropdown .fern-dropdown-item svg {
  width: calc(var(--spacing) * 4);
  height: calc(var(--spacing) * 4);
}

/* Status dropdown link — pulsing dot indicator (from fern/styles.css) */
@keyframes status-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

a[href*="status.signalwire.com"]::after {
  content: "";
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  margin-left: 0.375rem;
  border-radius: 50%;
  background-color: var(--grayscale-10);
  vertical-align: middle;
  animation: status-pulse 2s ease-in-out infinite;
}

/* --- Product switcher trigger --- */
.fern-product-selector {
  appearance: none;
  background: transparent;
  border: 0;
  font: inherit;
  padding: 0;
  cursor: pointer;
}

.product-dropdown-trigger {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing) * 1);
  height: calc(var(--spacing) * 9);
  padding-inline: calc(var(--spacing) * 2);
  border-radius: calc(var(--radius) * 1.5);
  color: var(--grayscale-a12);
  transition: background-color 0.15s;
}

.product-dropdown-trigger:hover,
.fern-product-selector[data-state="open"] .product-dropdown-trigger {
  background-color: var(--grayscale-a4);
}

.product-dropdown-trigger .product-item-title {
  margin: 0;
  font-size: var(--text-sm);
  font-weight: 500;
  width: fit-content;
}

.product-dropdown-trigger svg {
  width: calc(var(--spacing) * 4);
  height: calc(var(--spacing) * 4);
}

/* --- Product switcher panel --- */
[data-testid="product-dropdown-content"] {
  position: fixed;
  z-index: 50;
  display: none;
  background-color: var(--background);
  border: 1px solid var(--grayscale-a5);
  border-radius: 1.5rem;
  box-shadow: 0 20px 25px -5px #0000001a, 0 8px 10px -6px #0000001a;
  width: min(62rem, calc(100dvw - 3rem));
  max-height: 70vh;
  overflow-y: auto;
  transform-origin: top left;
}

[data-testid="product-dropdown-content"][data-state="open"] {
  display: block;
  animation: dropdown-expand 0.15s ease-out;
}

/* --- Product cards (fern-selection-item) --- */
.fern-selection-item {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: space-between;
  gap: calc(var(--spacing) * 2);
  width: 100%;
  padding-block: calc(var(--spacing) * 1);
  padding-left: calc(var(--spacing) * 1);
  padding-right: calc(var(--spacing) * 2.5);
  border: 1px solid transparent;
  border-radius: calc(var(--radius) * 1.5);
  cursor: pointer;
  text-align: left;
  transition: all 0.2s ease-in-out;
}

.fern-selection-item .item-main {
  display: flex;
  flex: 1;
  align-items: center;
  gap: calc(var(--spacing) * 2);
}

.fern-selection-item .item-text {
  display: flex;
  flex-direction: column;
}

.fern-selection-item .fern-selection-item-title {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.25;
  font-weight: 700;
  color: var(--grayscale-a12);
}

.fern-selection-item .fern-selection-item-subtitle {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.25;
  color: var(--grayscale-a9);
}

.fern-selection-item .fern-selection-item-icon {
  width: 56px;
  height: 56px;
  margin: calc(var(--spacing) * 1);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: calc(var(--radius) * 2);
  color: var(--grayscale-a11);
}

.fern-selection-item .fern-selection-item-icon.use-icon {
  border: 1px solid var(--grayscale-a5);
  padding: calc(var(--spacing) * 1);
}

.fern-selection-item .fern-selection-item-icon svg {
  display: block;
  width: 50%;
  height: 50%;
  transition: all 0.3s ease-in-out;
}

.fern-selection-item:hover {
  background-color: var(--grayscale-a3);
  color: var(--accent);
}

.fern-selection-item:hover svg {
  scale: 1.2;
}

/* =============================================================================
   PRODUCT SELECTOR — SignalWire custom 3-column grouped layout
   (clone of fern/styles.css, adapted: the demo adds an "SDK Reference" card
   in the SDKs column, and the footer separator moves to row 4)
   ============================================================================= */

.fern-product-selector-radio-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  column-gap: 1.5rem;
  row-gap: 0.5rem;
  padding: 3.5rem 1.25rem 0.4rem;
}

.fern-product-selector-radio-group > a {
  max-width: 320px;
  position: relative;
  text-decoration: none;
}

.fern-product-selector-radio-group > a .fern-selection-item {
  border-radius: 1rem;
  height: 100%;
}

/* Column 1: Products */
.fern-product-selector-radio-group > a[href*="/docs/platform"]          { grid-column: 1; grid-row: 1; }
.fern-product-selector-radio-group > a[href*="call-flow-builder"]       { grid-column: 1; grid-row: 2; }

/* Column 2: SDKs */
.fern-product-selector-radio-group > a[href*="server-sdks"]             { grid-column: 2; grid-row: 1; }
.fern-product-selector-radio-group > a[href*="browser-sdk"]             { grid-column: 2; grid-row: 2; }
.fern-product-selector-radio-group > a[data-product="sdk-reference"]    { grid-column: 2; grid-row: 3; }

/* Column 3: APIs */
.fern-product-selector-radio-group > a[href$="/docs/apis"]              { grid-column: 3; grid-row: 1; }
.fern-product-selector-radio-group > a[href*="/docs/swml"]              { grid-column: 3; grid-row: 2; }

/* Current product (the demo itself) — accent ring like an active selection */
.fern-product-selector-radio-group > a[data-state="active"] .fern-selection-item {
  border-color: var(--accent-a5);
  background-color: var(--accent-a2);
}

.fern-product-selector-radio-group > a[data-state="active"] .fern-selection-item-icon {
  color: var(--accent-11);
}

/* Full-width separator above the footer row */
.fern-product-selector-radio-group::after {
  content: "";
  grid-column: 1 / -1;
  grid-row: 4;
  align-self: start;
  border-top: 1px solid var(--grayscale-a5);
  pointer-events: none;
}

/* Compatibility API — text-only footer link, right-aligned */
.fern-product-selector-radio-group > a[href*="compatibility-api"] {
  grid-column: 1 / -1;
  grid-row: 4;
  max-width: none;
  width: fit-content;
  margin-left: auto;
  display: flex;
  align-items: center;
  padding: 0.5rem 0.25rem 0;
}

.fern-product-selector-radio-group > a[href*="compatibility-api"] .fern-selection-item {
  display: none;
}

.fern-product-selector-radio-group > a[href*="compatibility-api"]::after {
  content: "Migrating from Twilio™? See Compatibility API \2192";
  font-size: 0.8rem;
  color: var(--grayscale-a9);
}

.fern-product-selector-radio-group > a[href*="compatibility-api"]:hover::after {
  color: var(--accent-a11);
}

/* Group header labels */
.fern-product-selector-radio-group > a[href*="/docs/platform"]::before,
.fern-product-selector-radio-group > a[href*="server-sdks"]::before,
.fern-product-selector-radio-group > a[href$="/docs/apis"]::before {
  position: absolute;
  top: -2rem;
  left: 0.5rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--grayscale-a9);
  pointer-events: none;
}

.fern-product-selector-radio-group > a[href*="/docs/platform"]::before {
  content: "Explore SignalWire";
  color: var(--grayscale-12);
}

.fern-product-selector-radio-group > a[href*="server-sdks"]::before {
  content: "SDKs";
}

.fern-product-selector-radio-group > a[href$="/docs/apis"]::before {
  content: "APIs";
}