/* ---- Buttons ----------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: .8125rem 1.5rem;
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: -.01em;
  line-height: 1.2;
  border-radius: var(--radius-control);
  border: 1px solid transparent;
  transition:
    transform var(--dur-base) var(--ease),
    box-shadow var(--dur-base) var(--ease),
    background var(--dur-base) var(--ease),
    border-color var(--dur-base) var(--ease),
    color var(--dur-base) var(--ease);
  white-space: nowrap;
}
.btn .icon { transition: transform var(--dur-base) var(--ease); }
.btn:hover .icon { transform: translateX(2px); }

.btn-primary {
  background: var(--brand-bg);
  color: #fff;
  box-shadow: var(--shadow-sm), inset 0 1px 0 hsl(0 0% 100% / .12);
}
.btn-primary:hover {
  background: var(--brand-bg-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-brand), inset 0 1px 0 hsl(0 0% 100% / .12);
}

.btn-secondary {
  background: var(--surface-raised);
  color: var(--text-primary);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-xs);
}
.btn-secondary:hover {
  color: var(--text-primary);
  border-color: var(--text-tertiary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-ghost { background: transparent; color: var(--text-secondary); padding-inline: var(--space-3); }
.btn-ghost:hover { color: var(--text-primary); }

.btn-lg { padding: 1rem 1.875rem; font-size: var(--fs-base); }
.btn-sm { padding: .5rem 1rem; font-size: var(--fs-xs); }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .55; cursor: not-allowed; transform: none !important; box-shadow: none; }

/* On a dark band, buttons invert. */
.on-dark .btn-secondary {
  background: hsl(0 0% 100% / .06);
  border-color: hsl(0 0% 100% / .22);
  color: #fff;
  backdrop-filter: blur(8px);
}
.on-dark .btn-secondary:hover { background: hsl(0 0% 100% / .12); border-color: hsl(0 0% 100% / .4); color: #fff; }

/* ---- Forms ------------------------------------------------------------- */
.form-group { margin-bottom: var(--space-5); }
.form-group label {
  display: block;
  font-weight: 500;
  font-size: var(--fs-sm);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.form-control, .form-select, textarea.form-control {
  width: 100%;
  padding: .8125rem 1rem;
  font-size: var(--fs-base);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-control);
  background: var(--surface-0);
  color: var(--text-primary);
  transition: border-color var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease);
}
.form-control::placeholder { color: var(--text-tertiary); }
.form-control:focus, .form-select:focus {
  border-color: var(--brand-fg);
  outline: none;
  box-shadow: 0 0 0 4px var(--brand-tint);
}
textarea.form-control { resize: vertical; min-height: 8rem; }

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1.125rem;
  padding-right: 2.75rem;
}

.form-hint { font-size: var(--fs-xs); color: var(--text-tertiary); margin-top: var(--space-2); }
.form-check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}
.form-check input { margin-top: .3rem; accent-color: var(--brand-bg); width: 1rem; height: 1rem; }

.field-validation-error {
  color: var(--danger-fg);
  font-size: var(--fs-xs);
  display: block;
  margin-top: var(--space-2);
}
.input-validation-error { border-color: var(--danger-fg) !important; }
.validation-summary-errors {
  background: var(--danger-bg);
  color: var(--danger-fg);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-control);
  margin-bottom: var(--space-5);
  font-size: var(--fs-sm);
}
.validation-summary-errors ul { margin: 0; padding-left: 1.25rem; list-style: disc; }

.alert {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-control);
  font-size: var(--fs-sm);
  line-height: 1.5;
}
.alert-success { background: var(--success-bg); color: var(--success-fg); }
.alert-danger { background: var(--danger-bg); color: var(--danger-fg); }

/* Honeypot — hidden from people, visible to naive bots. */
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }