/*头部*/
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
  background: transparent;
}
.header.scrolled {
  background: var(--color-bg);
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 26px;
  font-weight: 900;
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-normal);
  white-space: nowrap;
  letter-spacing: 1.5px;
}
.header:not(.scrolled) .logo {
  color: var(--color-text-inverse);
}
.logo-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}
.logo-img-wrap {
  width: auto;
  height: 64px;
  border-radius: var(--radius-sm);
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition-normal);
  padding: 4px 10px;
}
.header.scrolled .logo-img-wrap {
  background: transparent;
  padding: 4px 8px;
}
.logo-img {
  width: auto;
  height: 100%;
  object-fit: contain;
  /* 白色描边 + 蓝色光影，沿 alpha 通道轮廓发光 */
  filter:
    drop-shadow(0 0 1.5px white)
    drop-shadow(0 0 3px rgba(255,255,255,0.9))
    drop-shadow(0 0 8px rgba(100,200,255,0.7));
}
/* 栏目 */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}
.nav-links a {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text-primary);
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}
.header:not(.scrolled) .nav-links a {
  color: var(--color-text-inverse);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  transform: scaleX(1);
}
/* 咨询按钮 */
.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-stack);
  background: var(--color-primary);
  color: var(--color-text-inverse)!important;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
}
.nav-cta:hover {
  background: var(--color-primary-hover);
}
/* 手机端出现按钮 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  z-index: 210;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}
.header:not(.scrolled) .hamburger span {
  background: var(--color-text-inverse);
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
/* 手机端 栏目 */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: 300;
  padding: calc(var(--nav-height) + var(--space-xl)) var(--space-lg) var(--space-lg);
  flex-direction: column;
  gap: var(--space-lg);
}
.mobile-menu.active {
  display: flex;
}
.mobile-menu a {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text-primary);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}
.mobile-menu .nav-cta {
  margin-top: var(--space-lg);
  width: 100%;
  justify-content: center;
  padding: 14px 24px;
  font-size: 16px;
}


@media (max-width: 1024px) {
  .nav-cta-desktop { display: none; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-cta-desktop { display: none; }
  .hamburger { display: flex; }
}


/* Container section */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}
.category-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-3xl);
}
.cat-tab {
  padding: 10px 28px;
  border-radius: 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-normal);
}
.cat-tab:hover {
  color: var(--color-primary);
  border-color: var(--color-primary-light);
}
.cat-tab.active {
  color: white;
  background: var(--color-primary);
  border-color: var(--color-primary);
}
.section {
  padding: var(--space-4xl) 0;
}
.section-alt {
  background: var(--color-bg-secondary);
}
.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}
.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 6px 18px;
  border-radius: 20px;
  margin-bottom: var(--space-md);
}
.section-title {
  font-size: 34px;
  font-weight: 900;
  color: var(--color-text-primary);
  letter-spacing: 1px;
  margin-bottom: var(--space-sm);
}
.section-subtitle {
  font-size: 17px;
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

@media (max-width: 640px) {
  .container { padding: 0 var(--space-md); }
  .section { padding: var(--space-2xl) 0; }
  .section-title { font-size: 24px; }
}






/* 4个资格tag */
.qualification-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 50px;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
}







/*首页 关于我们 / 关于我们 第一栏*/
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}
.about-text h2 {
  font-size: 32px;
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
}
.about-text p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}
/* 关于我们 右侧 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}
.stat-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  text-align: center;
  transition: box-shadow var(--transition-normal);
}
.stat-card:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}
.stat-number {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
  margin-bottom: var(--space-xs);
}
.stat-label {
  font-size: 14px;
  color: var(--color-text-secondary);
  font-weight: 500;
}
.stat-icon {
  margin-bottom: var(--space-md);
}


@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 640px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-text h2 { font-size: 24px; }
  .stats-grid { grid-template-columns: 1fr; }
}





/*首页 联系我们 / 联系我们页*/
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-3xl);
}
.contact-info h2 {
  font-size: 32px;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}
.contact-info > p {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  line-height: 1.6;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}
.contact-item-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-item-text h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 4px;
}
.contact-item-text p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}
/* 联系我们 表格 */
.contact-form {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
}
.contact-form h3 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  color: var(--color-text-primary);
}
.form-group {
  margin-bottom: var(--space-md);
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-xs);
}
.form-group label .required {
  color: var(--color-error);
  margin-left: 2px;
}
.form-input, .form-textarea {
  width: 100%;
  height: 48px;
  padding: 0 var(--space-md);
  font-size: 16px;
  font-family: var(--font-stack);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-textarea {
  height: 120px;
  padding: var(--space-sm) var(--space-md);
  resize: vertical;
}
.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}
.form-input::placeholder, .form-textarea::placeholder {
  color: var(--color-text-placeholder);
}
.btn-submit {
  width: 100%;
  height: 48px;
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font-stack);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
  margin-top: var(--space-xs);
}
.btn-submit:hover {
  background: var(--color-primary-hover);
}


@media (max-width: 1024px) {
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .contact-grid { grid-template-columns: 1fr; }
  .contact-info h2 { font-size: 24px; }
}









/*底部*/
.footer {
  background: var(--color-primary-dark);
  color: var(--color-text-inverse);
  padding: var(--space-3xl) 0 var(--space-xl);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}
.footer-brand .logo {
  font-size: 22px;
  margin-bottom: var(--space-md);
  color: var(--color-text-inverse);
}
.footer-brand p {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  line-height: 1.6;
}
.footer-col h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-text-inverse);
}
.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  padding: 6px 0;
  transition: color var(--transition-fast);
}
.footer-col a:hover {
  color: var(--color-text-inverse);
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.15);
  padding-top: var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: 14px;
  color: rgba(255,255,255,0.6);
}


@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}