/* BeaverID button system. Every button is rendered by ButtonHelper#action_button,
 * which emits these classes. Colors come from the app's --color-* tokens, so
 * light and dark themes follow automatically. Provider-specific (Google/Microsoft)
 * styling stays in omniauth.css. */

.btn {
  --btn-height: 40px;
  --btn-padding-x: 16px;
  --btn-icon-size: 18px;
  --btn-radius: 9px;

  --btn-bg: var(--color-surface);
  --btn-hover-bg: var(--color-surface-secondary);
  --btn-pressed-bg: var(--color-border);
  --btn-fg: var(--color-text);
  --btn-border: var(--color-border);
  --btn-hover-border: var(--color-text-muted);
  --btn-shadow: none;

  box-sizing: border-box;
  display: inline-flex;
  position: relative;
  isolation: isolate;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  vertical-align: middle;
  gap: 8px;
  min-width: 0;
  min-height: var(--btn-height);
  padding: 0 var(--btn-padding-x);
  border: 1px solid var(--btn-border);
  border-radius: var(--btn-radius);
  background: var(--btn-bg);
  color: var(--btn-fg);
  box-shadow: var(--btn-shadow);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    box-shadow 160ms ease,
    transform 120ms ease,
    opacity 160ms ease;
}

.btn__label {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn__icon {
  display: block;
  flex: 0 0 auto;
  width: var(--btn-icon-size);
  height: var(--btn-icon-size);
}


/* Interaction states. Loading buttons are disabled, so they skip hover/active. */

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

.btn:active:not(:disabled):not([aria-disabled="true"]):not(.btn--loading) {
  background: var(--btn-pressed-bg);
  transform: translateY(1px);
  box-shadow: none;
}

.btn:focus {
  outline: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px rgb(var(--rgb-primary) / 0.22);
}

.btn:is(:disabled, [aria-disabled="true"]):not(.btn--loading) {
  background: var(--color-surface-secondary);
  color: var(--color-text-muted);
  border-color: var(--color-border);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}


/* Variants */

.btn--primary {
  --btn-bg: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  --btn-hover-bg: var(--color-primary-dark);
  --btn-pressed-bg: var(--color-primary-dark);
  --btn-fg: var(--color-on-primary);
  --btn-border: transparent;
  --btn-hover-border: transparent;
  --btn-shadow: 0 1px 2px rgb(var(--rgb-shadow) / 0.12);
}

.btn--primary:hover:not(:disabled):not([aria-disabled="true"]):not(.btn--loading) {
  box-shadow: 0 3px 9px rgb(var(--rgb-shadow) / 0.12);
}

.btn--secondary {
  --btn-bg: var(--color-surface);
  --btn-hover-bg: var(--color-surface-secondary);
  --btn-pressed-bg: var(--color-border);
  --btn-fg: var(--color-text);
  --btn-border: var(--color-border);
  --btn-hover-border: var(--color-text-muted);
}

.btn--outline {
  --btn-bg: transparent;
  --btn-hover-bg: var(--color-primary-soft);
  --btn-pressed-bg: var(--color-primary-soft);
  --btn-fg: var(--color-primary);
  --btn-border: var(--color-primary);
  --btn-hover-border: var(--color-primary);
}

.btn--soft {
  --btn-bg: var(--color-primary-soft);
  --btn-hover-bg: rgb(var(--rgb-primary) / 0.18);
  --btn-pressed-bg: rgb(var(--rgb-primary) / 0.26);
  --btn-fg: var(--color-primary-dark);
  --btn-border: transparent;
  --btn-hover-border: transparent;
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-hover-bg: var(--color-surface-secondary);
  --btn-pressed-bg: var(--color-border);
  --btn-fg: var(--color-text);
  --btn-border: transparent;
  --btn-hover-border: transparent;
}

.btn--danger {
  --btn-bg: var(--color-danger-dark);
  --btn-hover-bg: color-mix(in srgb, var(--color-danger-dark) 88%, black);
  --btn-pressed-bg: color-mix(in srgb, var(--color-danger-dark) 75%, black);
  --btn-fg: var(--color-on-primary);
  --btn-border: transparent;
  --btn-hover-border: transparent;
}

.btn--danger-soft {
  --btn-bg: rgb(var(--rgb-danger) / 0.12);
  --btn-hover-bg: rgb(var(--rgb-danger) / 0.2);
  --btn-pressed-bg: rgb(var(--rgb-danger) / 0.26);
  --btn-fg: var(--color-danger-dark);
  --btn-border: transparent;
  --btn-hover-border: transparent;
}

.btn--link {
  --btn-bg: transparent;
  --btn-hover-bg: transparent;
  --btn-pressed-bg: transparent;
  --btn-fg: var(--color-primary);
  --btn-border: transparent;
  --btn-hover-border: transparent;

  min-height: 0;
  padding: 0;
  border-radius: 3px;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 3px;
}

.btn--link:hover:not(:disabled):not([aria-disabled="true"]) {
  text-decoration-color: currentColor;
}

.btn--link:active:not(:disabled):not([aria-disabled="true"]) {
  transform: none;
}

.btn--link:is(:disabled, [aria-disabled="true"]) {
  background: transparent;
  color: var(--color-text-muted);
  text-decoration: none;
}


/* Sizes */

.btn--sm {
  --btn-height: 32px;
  --btn-padding-x: 11px;
  --btn-icon-size: 15px;
  --btn-radius: 8px;

  font-size: 12px;
  gap: 6px;
}

.btn--lg {
  --btn-height: 48px;
  --btn-padding-x: 20px;
  --btn-icon-size: 20px;
  --btn-radius: 11px;

  font-size: 15px;
  gap: 9px;
}

.btn--block {
  display: flex;
  width: 100%;
}


/* Icon-only buttons are square, and their label is supplied via aria-label. */

.btn--icon {
  width: var(--btn-height);
  padding: 0;
  aspect-ratio: 1 / 1;
}


/* Loading: the spinner replaces the leading icon. Keep the label and colors so the layout stays put. */

.btn--loading {
  cursor: progress;
}

.btn--loading:disabled {
  background: var(--btn-bg);
  color: var(--btn-fg);
  border-color: var(--btn-border);
  box-shadow: var(--btn-shadow);
}

.btn__spinner {
  display: block;
  flex: 0 0 auto;
  width: var(--btn-icon-size);
  height: var(--btn-icon-size);
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: btn-spin 0.8s linear infinite;
}

@keyframes btn-spin {
  to {
    transform: rotate(360deg);
  }
}


/* Dropdown: the chevron rotates while aria-expanded is true. Behavior is in button.js. */

.btn--dropdown .btn__chevron {
  display: block;
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
  margin-left: 4px;
  transition: transform 160ms ease;
}

.btn--dropdown[aria-expanded="true"] .btn__chevron {
  transform: rotate(180deg);
}


/* Button groups: adjacent buttons share borders and keep equal height. */

.btn-group {
  display: inline-flex;
  flex-wrap: nowrap;
  align-items: stretch;
  min-width: 0;
}

.btn-group > .btn {
  border-radius: 0;
  margin-left: -1px;
}

.btn-group > .btn:first-child {
  border-radius: var(--btn-radius) 0 0 var(--btn-radius);
  margin-left: 0;
}

.btn-group > .btn:last-child {
  border-radius: 0 var(--btn-radius) var(--btn-radius) 0;
}

.btn-group > .btn:only-child {
  border-radius: var(--btn-radius);
}

.btn-group > .btn:hover,
.btn-group > .btn:focus-visible {
  z-index: 1;
}


/* Touch devices get larger targets (WCAG 2.5.5 recommends 44px). */

@media (pointer: coarse) {
  .btn {
    min-height: 44px;
  }

  .btn.btn--icon {
    width: 44px;
    height: 44px;
  }

  .btn--sm {
    min-height: 36px;
  }
}


@media (prefers-reduced-motion: reduce) {
  .btn,
  .btn__chevron {
    transition: none;
  }

  .btn__spinner {
    animation-duration: 2s;
  }
}


@media (forced-colors: active) {
  .btn {
    border: 1px solid ButtonText;
    forced-color-adjust: auto;
  }

  .btn:focus-visible {
    outline: 2px solid Highlight;
  }

  .btn:is(:disabled, [aria-disabled="true"]) {
    border-color: GrayText;
    color: GrayText;
  }
}