/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-body);
  padding: 12px 24px;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  border: 1px solid transparent;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}
.btn--lg   { padding: 16px 36px; font-size: 13px; }
.btn--full { width: 100%; }

.btn--accent {
  background: var(--color-accent);
  color: #000;
  border-color: var(--color-accent);
  font-weight: 600;
  box-shadow: 0 0 32px rgba(245, 197, 24, 0.22);
  position: relative;
  overflow: hidden;
}
.btn--accent::after {
  content: '';
  position: absolute;
  top: 0; left: -80%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.28), transparent);
  transform: skewX(-20deg);
  transition: left 0.55s ease;
  pointer-events: none;
}
.btn--accent:hover {
  background: #f7cd30;
  border-color: #f7cd30;
  box-shadow: 0 0 52px rgba(245, 197, 24, 0.48), 0 4px 24px rgba(0,0,0,0.3);
  transform: translateY(-1px);
}
.btn--accent:hover::after { left: 140%; }
.btn--accent:active {
  transform: translateY(0);
  box-shadow: 0 0 20px rgba(245, 197, 24, 0.18);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: rgba(255,255,255,0.1);
}
.btn--ghost:hover {
  color: var(--color-text-primary);
  border-color: rgba(255,255,255,0.22);
  background: rgba(255,255,255,0.04);
  transform: translateY(-1px);
}

.btn--success {
  background: var(--color-success) !important;
  border-color: var(--color-success) !important;
  color: #000 !important;
  box-shadow: 0 0 32px rgba(34, 197, 94, 0.25) !important;
}

/* ── Form validation states ── */
.field--error input,
.field--error textarea,
input.field--error,
textarea.field--error {
  border-color: #ef4444 !important;
}
.field-error {
  display: block;
  font-size: 12px;
  color: #ef4444;
  margin-top: 4px;
}

/* ── Screen reader only ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}