.btn {
  --btn-bg: var(--c-text);
  --btn-fg: var(--c-field);
  --btn-border: var(--c-text);
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  padding: 18px 28px;
  font-family: var(--ff-body);
  font-size: var(--fs-300);
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--btn-fg);
  background: var(--btn-bg);
  border: 1px solid var(--btn-border);
  border-radius: var(--radius-pill);
  cursor: pointer;
  overflow: hidden;
  transition: color var(--dur-base) var(--ease-out-expo),
              border-color var(--dur-base) var(--ease-out-expo),
              transform var(--dur-base) var(--ease-out-expo);
  isolation: isolate;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--pm-gradient-brand);
  transform: translateY(101%);
  transition: transform 600ms var(--ease-out-expo);
  z-index: -1;
}

@media (hover: hover) and (pointer: fine) { .btn:hover {
  color: var(--pm-white);
  border-color: var(--c-mark);
} }
@media (hover: hover) and (pointer: fine) { .btn:hover::before { transform: translateY(0); } }

.btn .btn__arrow {
  display: inline-block;
  transition: transform var(--dur-base) var(--ease-out-expo);
}
@media (hover: hover) and (pointer: fine) { .btn:hover .btn__arrow { transform: translateX(6px); } }

.btn--ghost {
  --btn-bg: transparent;
  --btn-fg: var(--c-text);
  --btn-border: var(--c-line-2);
}
@media (hover: hover) and (pointer: fine) { .btn--ghost:hover { color: var(--pm-white); border-color: var(--c-mark); } }

.btn--lg { padding: 22px 36px; font-size: var(--fs-400); }
.btn--sm { padding: 12px 20px; font-size: var(--fs-200); }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: 500;
  color: var(--c-accent-2);
  letter-spacing: 0.01em;
  position: relative;
  padding-bottom: 4px;
}
.text-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: currentColor;
  transform-origin: right;
  transform: scaleX(1);
  transition: transform 500ms var(--ease-out-expo);
}
@media (hover: hover) and (pointer: fine) { .text-link:hover::after { transform-origin: left; transform: scaleX(0); animation: textLinkUnderline 700ms var(--ease-out-expo) forwards; } }

@keyframes textLinkUnderline {
  0% { transform-origin: right; transform: scaleX(1); }
  50% { transform-origin: right; transform: scaleX(0); }
  51% { transform-origin: left; transform: scaleX(0); }
  100% { transform-origin: left; transform: scaleX(1); }
}
.text-link .arrow { transition: transform var(--dur-base) var(--ease-out-expo); }
@media (hover: hover) and (pointer: fine) { .text-link:hover .arrow { transform: translateX(6px); } }

/* Press (plan 31, Р5; site pages only — Bay apps keep theirs): the button answers on press, not on release;
   140 ms, never from or to nothing. Reduced motion: no scale. */
[data-site-theme] .btn {
  touch-action: manipulation;
  transition: color var(--dur-base) var(--ease-out-expo),
              border-color var(--dur-base) var(--ease-out-expo),
              transform 140ms var(--ease-out-expo);
}
[data-site-theme] .btn:active { transform: scale(0.97); }
@media (prefers-reduced-motion: reduce) {
  [data-site-theme] .btn:active { transform: none; }
}