/*
 * Shared button and form-field layer for static landing surfaces.
 * Tokens mirror services/landing/usefull-tokens.js.
 */
:root {
  --u-btn-bg: var(--color-surface-card, var(--card));
  --u-btn-surface: var(--color-surface-sunken, var(--surface));
  --u-btn-text: var(--color-text-primary, var(--text-primary));
  --u-btn-soft: var(--color-text-secondary, var(--text-soft));
  --u-btn-muted: var(--color-text-muted, var(--text-muted));
  --u-button-primary-bg: var(--color-action-primary, var(--coral));
  --u-button-primary-hover: var(--color-action-primary-hover, var(--coral-dark, var(--coral)));
  --u-button-primary-soft-bg: var(--color-coral-bg, var(--coral-bg));
  --u-btn-border: var(--color-border-default, var(--border-color));
  --u-btn-border-light: var(--color-border-divider, var(--border-light));
  --u-btn-radius: var(--radius-lg, 12px);
  --u-btn-radius-pill: var(--radius-pill, 100px);
  --u-btn-focus: 0 0 0 4px color-mix(in srgb, var(--u-button-primary-bg) 12%, transparent);
  --u-btn-shadow-sm: var(--shadow-sm);
  --u-btn-primary-shadow: 0 1px 3px color-mix(in srgb, var(--u-button-primary-bg) 18%, transparent);
  --u-btn-primary-shadow-hover: 0 6px 18px color-mix(in srgb, var(--u-button-primary-bg) 18%, transparent);
  --u-btn-surface-hover-bg: var(--color-surface-raised, var(--card));
  --u-btn-disabled-opacity: 0.58;
}

.u-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  min-width: 0;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: var(--u-btn-radius);
  font-family: 'Jost', sans-serif;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  transition:
    transform 0.16s ease,
    box-shadow 0.16s ease,
    background-color 0.16s ease,
    border-color 0.16s ease,
    color 0.16s ease;
}

.u-btn svg,
.u-btn [data-lucide] {
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
}

.u-btn:hover:not(:disabled):not([aria-disabled="true"]) {
  transform: translateY(-1px);
}

.u-btn:focus-visible {
  outline: none;
  box-shadow: var(--u-btn-focus);
}

.u-btn:disabled,
.u-btn[aria-disabled="true"] {
  opacity: var(--u-btn-disabled-opacity);
  cursor: not-allowed;
  pointer-events: none;
  transform: none;
  box-shadow: none;
}

.u-btn--primary {
  background: var(--u-button-primary-bg);
  border-color: var(--u-button-primary-bg);
  color: var(--color-text-inverse, var(--card));
  box-shadow: var(--u-btn-primary-shadow);
}

.u-btn--primary:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--u-button-primary-hover);
  border-color: var(--u-button-primary-hover);
  box-shadow: var(--u-btn-primary-shadow-hover);
}

.u-btn--surface {
  background: var(--u-btn-bg);
  border-color: var(--u-btn-border-light);
  color: var(--u-btn-soft);
  box-shadow: var(--u-btn-shadow-sm);
}

.u-btn--surface:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--u-btn-surface-hover-bg);
  border-color: var(--u-btn-border);
  color: var(--u-btn-text);
}

.u-btn--ghost {
  background: transparent;
  border-color: transparent;
  color: var(--u-btn-soft);
}

.u-btn--ghost:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--u-btn-surface);
  color: var(--u-btn-text);
}

.u-btn--danger {
  background: var(--u-btn-bg);
  border-color: var(--u-button-primary-bg);
  color: var(--u-button-primary-bg);
}

.u-btn--danger:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--u-button-primary-soft-bg);
}

.u-btn--pill {
  border-radius: var(--u-btn-radius-pill);
}

.u-btn--icon {
  width: 40px;
  min-width: 40px;
  padding: 0;
  gap: 0;
}

.u-btn--sm {
  min-height: 34px;
  padding: 0 12px;
  font-size: 13px;
}

.u-btn--lg {
  min-height: 48px;
  padding: 0 22px;
  font-size: 15px;
}

.u-btn--full {
  width: 100%;
}

.admin-link-button:disabled,
.admin-link-button[aria-disabled="true"] {
  opacity: var(--u-btn-disabled-opacity);
  cursor: not-allowed;
  pointer-events: none;
  transform: none;
  box-shadow: none;
}

/* EN | RU segmented switch in the marketing headers. */
.lang-switch {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--u-btn-border-light);
  border-radius: var(--u-btn-radius-pill);
  background: var(--u-btn-surface);
  font-family: 'Jost', sans-serif;
  font-size: 12px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.04em;
}

.lang-switch__item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 26px;
  padding: 0 8px;
  border-radius: var(--u-btn-radius-pill);
  color: var(--u-btn-soft);
  text-decoration: none;
  transition: color 0.15s ease, background-color 0.15s ease, box-shadow 0.15s ease;
}

a.lang-switch__item:hover {
  color: var(--u-btn-text);
  background: var(--u-btn-surface-hover-bg);
}

a.lang-switch__item:focus-visible {
  outline: none;
  box-shadow: var(--u-btn-focus);
}

.lang-switch__item[aria-current] {
  background: var(--u-btn-bg);
  color: var(--u-btn-text);
  box-shadow: var(--u-btn-shadow-sm);
}

/* Bar copy hides on phones; the mobile menu carries its own copy. */
.lang-switch--bar {
  display: none;
}

@media (min-width: 640px) {
  .lang-switch--bar {
    display: inline-flex;
  }
}

.lang-switch--menu {
  align-self: flex-start;
  margin: 4px 0;
}

.lang-switch--menu .lang-switch__item {
  min-width: 48px;
  height: 34px;
  font-size: 13px;
}

/* iOS Safari zooms into a focused field under 16px and keeps the zoom after the
 * keyboard closes. Touch screens get 16px fields; mouse screens keep the design size.
 * !important: the Try it field comes from the ui-kit with an inline 14px. */
@media (pointer: coarse) {
  input:not([type="checkbox"]):not([type="radio"]):not([type="range"]),
  textarea,
  select {
    font-size: 16px !important;
  }
}