.text-center {
  text-align: center;
}

.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 148px;
  height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  transition: all var(--transition-base);
  font-weight: 500;
}

.btn--primary {
  color: #ffffff;
  background: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  transform: translateY(-1px);
  background: var(--color-primary-soft);
}

.btn--ghost {
  border: 1px solid var(--color-line);
  color: var(--color-primary);
  background: #ffffff;
}

.btn--ghost:hover {
  border-color: var(--color-primary);
}

/* 2026 visual refresh: buttons and floating utilities. */
.btn {
  position: relative;
  overflow: hidden;
  height: 52px;
  padding: 0 28px;
  border: 1px solid transparent;
  box-shadow: 0 12px 30px rgba(17, 24, 39, 0.08);
  letter-spacing: 0.01em;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 0%, rgba(255,255,255,0.26) 45%, transparent 72%);
  transform: translateX(-120%);
  transition: transform 0.6s ease;
}

.btn:hover::before {
  transform: translateX(120%);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, #253044 100%);
  box-shadow: 0 16px 36px rgba(17, 24, 39, 0.18);
}

.btn--primary:hover {
  transform: translateY(-3px);
  background: linear-gradient(135deg, #172033 0%, #32415b 100%);
  box-shadow: 0 22px 48px rgba(17, 24, 39, 0.22);
}

.btn--ghost {
  color: var(--color-primary);
  border-color: rgba(17, 24, 39, 0.1);
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(14px);
}

.btn--ghost:hover {
  transform: translateY(-3px);
  border-color: rgba(40, 92, 255, 0.28);
  background: #ffffff;
  box-shadow: 0 18px 44px rgba(17, 24, 39, 0.11);
}

.page-backtop,
.subpage-backtop,
.legal-backtop {
  backdrop-filter: blur(14px);
  box-shadow: 0 18px 44px rgba(17, 24, 39, 0.18);
}