.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-white);
  transition: box-shadow var(--transition-normal);
}

.header--scrolled {
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.header__logo {
  flex-shrink: 0;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--text-sm);
  color: var(--color-neutral-500);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
  padding: var(--space-xs) 0;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
}

.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  z-index: 1001;
}

.hamburger__line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-neutral-600);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.hamburger--active .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger--active .hamburger__line:nth-child(2) {
  opacity: 0;
}

.hamburger--active .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav__overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 998;
}

.footer {
  background: var(--color-primary-dark);
  color: var(--color-white);
  padding: var(--space-3xl) 0 0;
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-3xl);
}

.footer__logo {
  margin-bottom: var(--space-md);
}

.footer__desc {
  color: rgba(255,255,255,0.7);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.footer__title {
  color: var(--color-white);
  font-size: var(--text-base);
  margin-bottom: var(--space-md);
  font-weight: 600;
}

.footer__links li,
.footer__contact li {
  margin-bottom: var(--space-sm);
}

.footer__links a {
  color: rgba(255,255,255,0.7);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

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

.footer__contact li {
  color: rgba(255,255,255,0.7);
  font-size: var(--text-sm);
}

.footer__contact a {
  color: var(--color-accent);
}

.footer__bottom {
  margin-top: var(--space-3xl);
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: var(--space-lg) 0;
  text-align: center;
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.5);
}

/* Page Hero (shared subpage banner) */
.page-hero {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  padding: var(--space-4xl) 0;
  text-align: center;
}

.page-hero__title {
  color: var(--color-white);
  font-size: var(--text-6xl);
  margin-bottom: var(--space-sm);
}

.breadcrumb {
  color: rgba(255,255,255,0.7);
  font-size: var(--text-sm);
}

.breadcrumb a {
  color: rgba(255,255,255,0.7);
  transition: color var(--transition-fast);
}

.breadcrumb a:hover {
  color: var(--color-white);
}

.breadcrumb__sep {
  margin: 0 var(--space-sm);
}

/* Grid system */
.grid {
  display: grid;
  gap: var(--space-xl);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }

/* CTA Section (shared) */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  text-align: center;
}

.cta-section__title {
  color: var(--color-white);
  font-size: var(--text-4xl);
  margin-bottom: var(--space-md);
}

.cta-section__text {
  color: rgba(255,255,255,0.8);
  margin-bottom: var(--space-xl);
  font-size: var(--text-lg);
}

.cta-section__buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Map placeholder */
.map-section {
  padding-bottom: var(--space-4xl);
}

.map-placeholder {
  background: var(--color-neutral-100);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.map-placeholder__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-4xl);
  text-align: center;
  min-height: 300px;
}

.map-placeholder__inner svg {
  margin-bottom: var(--space-md);
}

.map-placeholder__hint {
  font-size: var(--text-sm);
  color: var(--color-neutral-400);
  margin-top: var(--space-sm);
}

/* Product detail (shared pattern) */
.product-detail__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.product-detail__inner--reverse .product-detail__image {
  order: 1;
}

.product-detail__content h2 {
  margin-bottom: var(--space-md);
}

.product-detail__content h3 {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

.product-detail__content ul {
  padding-left: var(--space-lg);
  list-style: disc;
}

.product-detail__content ul li {
  margin-bottom: var(--space-xs);
}

/* Case detail (shared pattern) */
.case-detail__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.case-detail__inner--reverse .case-detail__image {
  order: 1;
}

.case-detail__tag {
  display: inline-block;
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-md);
}

.case-detail__section {
  margin-top: var(--space-lg);
}

.case-detail__section h3 {
  color: var(--color-accent);
  font-size: var(--text-base);
  margin-bottom: var(--space-xs);
}

/* Contact section */
.contact-section__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
}

.contact-info__item {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.contact-info__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-info__item h3 {
  font-size: var(--text-sm);
  margin-bottom: 2px;
}

.contact-info__item p {
  font-size: var(--text-sm);
  color: var(--color-neutral-400);
}

.contact-info__wechat {
  margin-top: var(--space-xl);
  text-align: center;
}

.contact-info__wechat p {
  margin-top: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-neutral-400);
}

/* Form */
.contact-section__form h2 {
  margin-bottom: var(--space-sm);
}

.contact-section__form > p {
  color: var(--color-neutral-400);
  margin-bottom: var(--space-xl);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--color-neutral-600);
}

.required { color: var(--color-error); }

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  background: var(--color-white);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(13,94,107,0.1);
}

.form-group input.error,
.form-group textarea.error {
  border-color: var(--color-error);
}

.form-message {
  margin-top: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  display: none;
}

.form-message--success {
  display: block;
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.form-message--error {
  display: block;
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

.btn--full {
  width: 100%;
}

/* Table */
.table-wrap {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  padding: var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-neutral-200);
}

.table th {
  background: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
  font-size: var(--text-sm);
}

.table tr:nth-child(even) td {
  background: var(--color-neutral-100);
}

.table tr:hover td {
  background: var(--color-primary-light);
}

/* Product nav tabs */
.product-nav__list {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.product-nav__link {
  padding: 10px 24px;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.product-nav__link:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* Timeline */
.timeline__list {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding-left: 40px;
}

.timeline__list::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-primary-light);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-2xl);
}

.timeline__dot {
  position: absolute;
  left: -28px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-primary-light);
}

.timeline__content h4 {
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.timeline__content p {
  font-size: var(--text-sm);
  color: var(--color-neutral-400);
}