/* ============================================
   Footer - 页脚样式
   ============================================ */

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-secondary);
  padding: var(--space-20) 0 var(--space-8);
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--color-primary) 50%,
    transparent 100%);
  opacity: 0.3;
}

.footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

/* ===== 公司信息区 ===== */
.footer__brand {
  max-width: 360px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.footer__logo-icon {
  width: auto;
  height: 40px;
  object-fit: contain;
  border-radius: 8px;
}

.footer__logo-text {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
}

.footer__logo-text span {
  color: var(--color-primary);
}

.footer__desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
}

.footer__social {
  display: flex;
  gap: var(--space-3);
}

.footer__social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-secondary);
  color: var(--text-secondary);
  transition: all var(--transition-base);
}

.footer__social-link:hover {
  background: rgba(37, 99, 235, 0.1);
  border-color: var(--border-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* ===== 链接列 ===== */
.footer__col {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__col-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.footer__link:hover {
  color: var(--color-primary);
}

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.footer__contact-icon {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--color-primary);
}

/* ===== 二维码 ===== */
.footer__qrcode {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.footer__qrcode-img {
  width: 100px;
  height: 100px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.footer__qrcode-img::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    repeating-conic-gradient(var(--text-primary) 0% 25%, transparent 0% 50%);
  background-size: 12px 12px;
  background-position: 8px 8px;
  opacity: 0.8;
}

.footer__qrcode-img::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 24px;
  height: 24px;
  background: var(--bg-secondary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-sm);
}

.footer__qrcode-text {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* ===== 底部版权 ===== */
.footer__bottom {
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copyright {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.footer__copyright a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer__copyright a:hover {
  color: var(--color-primary);
}

.footer__links {
  display: flex;
  gap: var(--space-6);
}

.footer__links a {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-primary);
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .footer__top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .footer__top {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

@media (max-width: 767px) {
  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer__links {
    flex-wrap: wrap;
    justify-content: center;
  }
}