/* ==========================================================================
   button.css — Button component
   Import order: global.css → pacifico.css → aliases.css → button.css
   ========================================================================== */

/* --------------------------------------------------------------------------
   Reset & base
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  /* Page background — neutral-low */
  background-color: var(--neutral-color-low);
  font-family: var(--font-family-base);
  font-size: var(--font-size-m);
  color: var(--neutral-color-xhigh);
  -webkit-font-smoothing: antialiased;
}

/* --------------------------------------------------------------------------
   Showcase layout
   -------------------------------------------------------------------------- */
.showcase {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

.showcase__header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.showcase__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-small);
  letter-spacing: var(--letter-spacing-xlarge);
  color: var(--neutral-color-xhigh);
}

.showcase__subtitle {
  font-size: var(--font-size-s);
  font-weight: var(--font-weight-regular);
  color: var(--neutral-color-medium);
  letter-spacing: var(--letter-spacing-small);
}

/* State grid: 6 columns (label + 5 states) */
.btn-grid {
  display: grid;
  grid-template-columns: 100px repeat(5, 1fr);
  gap: var(--spacing-m);
  align-items: center;
}

.btn-grid__col-header {
  /* Column header labels — typography labels */
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--neutral-color-medium);
  letter-spacing: var(--letter-spacing-small);
  text-align: center;
}

.btn-grid__col-header:first-child {
  text-align: left;
}

.btn-grid__row-label {
  /* Row variant label */
  font-size: var(--font-size-s);
  font-weight: var(--font-weight-medium);
  color: var(--neutral-color-medium);
  letter-spacing: var(--letter-spacing-small);
}

.btn-grid__cell {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Dark background section for negative variants */
.btn-grid--dark {
  background-color: var(--neutral-color-xhigh);
  border-radius: var(--border-radius-medium);
  padding: var(--spacing-l);
}

.btn-grid--dark .btn-grid__col-header,
.btn-grid--dark .btn-grid__row-label {
  color: var(--neutral-color-medium);
}

/* --------------------------------------------------------------------------
   Button — base
   -------------------------------------------------------------------------- */
.btn {
  /* Layout */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);

  /* Sizing — Button padding: spacing-s vertical, spacing-l horizontal */
  padding: var(--spacing-s) var(--spacing-l);
  height: var(--spacing-2xl); /* 48px */
  min-width: max-content;

  /* Shape — Buttons: border-radius-circular */
  border-radius: var(--border-radius-circular);
  border: var(--border-width-small) solid transparent;

  /* Typography — body medium */
  font-family: var(--font-family-base);
  font-size: var(--font-size-m);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-xlarge);
  letter-spacing: var(--letter-spacing-medium);
  white-space: nowrap;
  text-align: center;
  text-decoration: none;

  /* Interaction */
  cursor: pointer;
  appearance: none;
  transition: background-color 300ms ease-in-out,
              color 300ms ease-in-out,
              border-color 300ms ease-in-out,
              opacity 300ms ease-in-out;

  /* Overflow (for loading dots) */
  position: relative;
  overflow: hidden;
}

.btn:focus-visible {
  outline: var(--border-width-medium) solid var(--color-brand-primary-medium);
  outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   Variant: Primary
   bg=primary-medium · text=neutral-xlow · no visible border
   -------------------------------------------------------------------------- */
.btn--primary {
  /* Brand primary — semantic alias */
  background-color: var(--color-brand-primary-medium);
  color: var(--neutral-color-xlow);
  border-color: transparent;
}

.btn--primary:hover,
.btn--primary.is-hover {
  background-color: var(--color-brand-primary-high);
}

.btn--primary:active,
.btn--primary.is-pressed {
  background-color: var(--color-brand-primary-xhigh);
}

.btn--primary:disabled,
.btn--primary.is-disabled {
  background-color: var(--color-brand-primary-medium);
  opacity: var(--opacity-medium); /* 32% */
  cursor: not-allowed;
  pointer-events: none;
}

/* Primary — negative (dark background) */
.btn--primary.btn--negative {
  background-color: var(--neutral-color-xlow);
  color: var(--color-brand-primary-medium);
}

.btn--primary.btn--negative:hover,
.btn--primary.btn--negative.is-hover {
  background-color: var(--color-brand-primary-xlow);
  color: var(--color-brand-primary-high);
}

.btn--primary.btn--negative:active,
.btn--primary.btn--negative.is-pressed {
  background-color: var(--color-brand-primary-xlow);
  color: var(--color-brand-primary-xhigh);
}

/* --------------------------------------------------------------------------
   Variant: Secondary
   bg=neutral-xlow · text+border=primary-medium
   -------------------------------------------------------------------------- */
.btn--secondary {
  /* Brand primary border + text, surface background */
  background-color: var(--neutral-color-xlow);
  color: var(--color-brand-primary-medium);
  border-color: var(--color-brand-primary-medium);
}

.btn--secondary:hover,
.btn--secondary.is-hover {
  color: var(--color-brand-primary-high);
  border-color: var(--color-brand-primary-high);
}

.btn--secondary:active,
.btn--secondary.is-pressed {
  color: var(--neutral-color-xhigh);
  border-color: var(--neutral-color-xhigh);
}

.btn--secondary:disabled,
.btn--secondary.is-disabled {
  opacity: var(--opacity-medium);
  cursor: not-allowed;
  pointer-events: none;
}

/* Secondary — negative */
.btn--secondary.btn--negative {
  background-color: transparent;
  color: var(--neutral-color-xlow);
  border-color: var(--neutral-color-xlow);
}

.btn--secondary.btn--negative:hover,
.btn--secondary.btn--negative.is-hover {
  color: var(--color-brand-primary-low);
  border-color: var(--color-brand-primary-low);
}

.btn--secondary.btn--negative:active,
.btn--secondary.btn--negative.is-pressed {
  color: var(--neutral-color-low);
  border-color: var(--neutral-color-low);
}

/* --------------------------------------------------------------------------
   Variant: Ghost
   bg=neutral-xlow · text=primary-medium · no border
   -------------------------------------------------------------------------- */
.btn--ghost {
  /* No border, transparent background */
  background-color: var(--neutral-color-xlow);
  color: var(--color-brand-primary-medium);
  border-color: transparent;
}

.btn--ghost:hover,
.btn--ghost.is-hover {
  background-color: var(--color-brand-primary-xlow);
  color: var(--color-brand-primary-high);
}

.btn--ghost:active,
.btn--ghost.is-pressed {
  background-color: var(--color-brand-primary-xlow);
  color: var(--neutral-color-xhigh);
}

.btn--ghost:disabled,
.btn--ghost.is-disabled {
  opacity: var(--opacity-medium);
  cursor: not-allowed;
  pointer-events: none;
}

/* Ghost — negative */
.btn--ghost.btn--negative {
  background-color: transparent;
  color: var(--neutral-color-xlow);
}

.btn--ghost.btn--negative:hover,
.btn--ghost.btn--negative.is-hover {
  background-color: rgba(253, 253, 253, 0.12);
  color: var(--color-brand-primary-low);
}

.btn--ghost.btn--negative:active,
.btn--ghost.btn--negative.is-pressed {
  background-color: rgba(253, 253, 253, 0.12);
  color: var(--neutral-color-low);
}

/* --------------------------------------------------------------------------
   Variant: Danger
   bg=neutral-xlow · text=danger-medium · no border
   -------------------------------------------------------------------------- */
.btn--danger {
  /* Feedback danger tokens */
  background-color: var(--neutral-color-xlow);
  color: var(--feedback-color-danger-medium);
  border-color: transparent;
}

.btn--danger:hover,
.btn--danger.is-hover {
  background-color: var(--feedback-color-danger-xlow);
  color: var(--feedback-color-danger-high);
}

.btn--danger:active,
.btn--danger.is-pressed {
  background-color: var(--feedback-color-danger-xlow);
  color: var(--feedback-color-danger-xhigh);
}

.btn--danger:disabled,
.btn--danger.is-disabled {
  opacity: var(--opacity-medium);
  cursor: not-allowed;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   Loading state — animated dots
   Hides label text, shows three bouncing dots
   -------------------------------------------------------------------------- */
.btn--loading {
  cursor: wait;
  pointer-events: none;
}

.btn--loading .btn__label {
  opacity: 0;
}

.btn__dots {
  display: none;
  position: absolute;
  inset: 0;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2xs);
}

.btn--loading .btn__dots {
  display: flex;
}

.btn__dot {
  width: 6px;
  height: 6px;
  border-radius: var(--border-radius-circular);
  background-color: currentColor;
  animation: btn-bounce 1.2s ease-in-out infinite;
}

.btn__dot:nth-child(1) { animation-delay: 0s; }
.btn__dot:nth-child(2) { animation-delay: 0.2s; }
.btn__dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes btn-bounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40%           { transform: scale(1);   opacity: 1; }
}

/* --------------------------------------------------------------------------
   Full-width modifier
   -------------------------------------------------------------------------- */
.btn--full-width {
  width: 100%;
}