/* ============================================
   Footer（按 REDESIGN_PLAN.md 调性重构）
   - 深色克制底 / 细线分隔 / 信息清晰
   ============================================ */

.footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.82);
  padding: var(--space-2xl) 0;
  margin-top: var(--space-3xl);
}

.footer-container {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: var(--space-xl);
}

.footer-section h3 {
  margin: 0 0 var(--space-md);
  font-family: var(--font-en-display);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.86);
}

.footer-section ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.footer-section a {
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--color-accent);
}

.footer-logo-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: var(--space-md);
}

.footer-logo-text strong {
  font-family: var(--font-cn-heading);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  color: rgba(255, 255, 255, 0.9);
}

.footer-logo-text span {
  font-family: var(--font-en-display);
  font-size: 11px;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
}

.footer-description {
  margin: 0;
  font-size: 14px;
  line-height: var(--leading-relaxed);
  color: rgba(255, 255, 255, 0.72);
}

.footer-contact {
  display: grid;
  gap: 12px;
  font-size: 14px;
  line-height: var(--leading-relaxed);
  color: rgba(255, 255, 255, 0.72);
}

.footer-contact-item {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 10px;
  align-items: start;
}

.footer-contact-icon {
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}

.footer-social {
  display: flex;
  gap: 10px;
  margin-top: var(--space-md);
}

.footer-social a {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.18);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.72);
  transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.footer-social a:hover {
  border-color: rgba(139, 105, 20, 0.6);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.footer-divider {
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.footer-copyright {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.62);
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.footer-links a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.62);
}

.footer-links a:hover {
  color: rgba(255, 255, 255, 0.9);
}

.footer-scroll-top {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.18);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.72);
  transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
  text-decoration: none;
}

.footer-scroll-top:hover {
  border-color: rgba(255, 255, 255, 0.35);
  color: rgba(255, 255, 255, 0.9);
  transform: translateY(-2px);
}

@media (max-width: 1024px) {
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .footer-container {
    padding: 0 var(--space-md);
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }
}