.top-bar {
  background-color: var(--brand-blue-dark);
  color: var(--white);
  overflow: hidden;
}

.top-bar__track {
  width: 100%;
  overflow: hidden;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

.top-bar__scroll {
  display: flex;
  width: max-content;
  animation: topbar-marquee 30s linear infinite;
}

.top-bar:hover .top-bar__scroll {
  animation-play-state: paused;
}

.top-bar__item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  flex-shrink: 0;
  padding: 0 1.5rem;
}

.top-bar__item svg {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
  opacity: 0.85;
}

.top-bar__item span {
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.025em;
}

@keyframes topbar-marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--white);
  transition: box-shadow 0.2s ease;
}

.navbar--scrolled {
  box-shadow: var(--shadow-md);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  height: 5rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.logo__img {
  height: 2.5rem;
  width: auto;
}

.logo__brand {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.logo__title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

.logo__tagline {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

.nav-links {
  display: none;
  align-items: center;
  gap: 2rem;
  margin-left: auto;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.025em;
  color: var(--text-primary);
  transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link--active {
  color: var(--brand-blue);
}

.navbar__actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}

.navbar__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
}

.navbar__toggle svg {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--text-primary);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.navbar__toggle[aria-expanded="true"] svg {
  transform: rotate(90deg);
}

/* Language Switcher */
.lang-switcher {
  position: relative;
}

.lang-switcher__btn {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.625rem;
  border: 1px solid var(--gray-200, #e5e7eb);
  border-radius: var(--radius-sm, 0.375rem);
  background-color: var(--white);
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.lang-switcher__btn:hover {
  border-color: var(--brand-blue);
  background-color: var(--brand-bg-light);
}

.lang-switcher__flag {
  display: inline-flex;
  align-items: center;
  line-height: 1;
}

.lang-switcher__flag img {
  display: block;
  border-radius: 2px;
  object-fit: cover;
}

.lang-switcher__btn svg {
  flex-shrink: 0;
}

.lang-switcher__current {
  max-width: 80px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lang-switcher__arrow {
  transition: transform 0.2s ease;
}

.lang-switcher__btn[aria-expanded="true"] .lang-switcher__arrow {
  transform: rotate(180deg);
}

.lang-switcher__dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 160px;
  background-color: var(--white);
  border: 1px solid var(--gray-200, #e5e7eb);
  border-radius: var(--radius-sm, 0.375rem);
  box-shadow: var(--shadow-lg, 0 10px 15px -3px rgb(0 0 0 / 0.1));
  opacity: 0;
  visibility: hidden;
  transform: translateY(-0.5rem);
  transition: all 0.2s ease;
  z-index: 100;
}

.lang-switcher__dropdown.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-switcher__option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.625rem 1rem;
  border: none;
  background: none;
  color: var(--text-primary);
  font-size: 0.8125rem;
  text-align: left;
  cursor: pointer;
  transition: all 0.15s ease;
}

.lang-switcher__option:hover {
  background-color: var(--brand-bg-light);
  color: var(--brand-blue);
}

.lang-switcher__option.active {
  color: var(--brand-blue);
  font-weight: 600;
  background-color: var(--brand-bg-light);
}

.lang-switcher__option:first-child {
  border-radius: var(--radius-sm, 0.375rem) var(--radius-sm, 0.375rem) 0 0;
}

.lang-switcher__option:last-child {
  border-radius: 0 0 var(--radius-sm, 0.375rem) var(--radius-sm, 0.375rem);
}

@media (min-width: 1024px) {
  .lang-switcher__btn {
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
  }
}

.mobile-menu {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  border-top: 1px solid var(--gray-100);
  background-color: var(--white);
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.3s ease,
              pointer-events 0s 0.35s;
}

.mobile-menu.is-open {
  max-height: 400px;
  opacity: 1;
  pointer-events: auto;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1),
              opacity 0.3s ease,
              pointer-events 0s 0s;
}

.mobile-menu.closing {
  max-height: 0;
  opacity: 0;
  pointer-events: none;
  transition: max-height 0.3s cubic-bezier(0.4, 0, 1, 1),
              opacity 0.25s ease,
              pointer-events 0s 0.3s;
}

.mobile-menu__inner {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.mobile-menu__inner .nav-link {
  opacity: 0;
  transform: translateX(-10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.mobile-menu.is-open .nav-link {
  opacity: 1;
  transform: translateX(0);
}

.mobile-menu.closing .nav-link {
  opacity: 0;
  transform: translateX(-10px);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.mobile-menu.is-open .nav-link:nth-child(1) { transition-delay: 0.05s; }
.mobile-menu.is-open .nav-link:nth-child(2) { transition-delay: 0.1s; }
.mobile-menu.is-open .nav-link:nth-child(3) { transition-delay: 0.15s; }
.mobile-menu.is-open .nav-link:nth-child(4) { transition-delay: 0.2s; }
.mobile-menu.is-open .nav-link:nth-child(5) { transition-delay: 0.25s; }
.mobile-menu.is-open .nav-link:nth-child(6) { transition-delay: 0.3s; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: var(--radius-sm);
  padding: 0.875rem 2rem;
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.025em;
  color: var(--white);
  background-color: var(--brand-blue);
  transition: transform 0.2s ease, background-color 0.2s ease, opacity 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

.btn--sm {
  padding: 0.625rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0;
}

.btn--white {
  background-color: var(--white);
  color: var(--brand-blue-dark);
}

.section {
  padding-top: 4rem;
  padding-bottom: 4rem;
}

.section--light {
  background-color: var(--brand-bg-light);
}

.section--white {
  background-color: var(--white);
}

.section-title {
  font-size: 1.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.section-subtitle {
  margin-top: 1rem;
  color: var(--text-secondary);
}

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

.footer {
  background-color: var(--brand-bg-light);
  padding-top: 4rem;
  color: var(--text-primary);
}

.footer__grid {
  display: grid;
  gap: 2.5rem;
  padding-bottom: 3rem;
}

.footer__heading {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
}

.footer__desc {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer__payment-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-right: 1rem;
}

.footer__payment-item {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-right: 1rem;
  padding: 0.25rem 0.5rem;
  background-color: rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
}

.footer__list {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer__link {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

.footer__socials {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.footer__socials img {
  height: 2rem;
  width: auto;
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  border-top: 1px solid var(--gray-200);
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}

.footer__payments {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.footer__payment-text {
  font-size: 0.75rem;
  color: var(--text-tertiary, #9ca3af);
}

.footer__payment-icons {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.payment-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 2rem;
  width: 3rem;
  background-color: var(--white);
  border-radius: 4px;
  padding: 0.25rem;
}

.payment-icon svg {
  height: 1.25rem;
  width: 1.25rem;
  color: var(--text-primary, #1a2e2e);
}

.payment-icon span {
  font-size: 0.5rem;
  font-weight: 700;
  margin-left: 0.25rem;
}

.footer__badges {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.footer__badge {
  height: 2.25rem;
  width: auto;
}

.footer__badge-text {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  padding: 0 0.5rem;
  font-size: 0.625rem;
  font-weight: 700;
  color: var(--white);
  background-color: var(--green-badge);
}

.footer__badge-text--outline {
  flex-direction: column;
  justify-content: center;
  background-color: var(--white);
  color: var(--purple);
  border: 1px solid var(--purple);
  line-height: 1.1;
  text-align: center;
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .nav-links {
    display: flex;
  }

  .navbar__toggle {
    display: none;
  }

  .section {
    padding-top: 6rem;
    padding-bottom: 6rem;
  }

  .section-title {
    font-size: 2.25rem;
  }

  .footer__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ========== WhatsApp 浮动按钮 ========== */
.whatsapp-float {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: #25d366;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(37, 211, 102, .4);
  transition: transform .2s, box-shadow .2s;
  text-decoration: none;
}

.whatsapp-float svg {
  width: 28px;
  height: 28px;
  fill: none;
  stroke: #fff;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 24px rgba(37, 211, 102, .5);
}

.whatsapp-float__tooltip {
  position: absolute;
  right: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0, 0, 0, .75);
  color: #fff;
  font-size: .8rem;
  padding: .35rem .65rem;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
}

.whatsapp-float:hover .whatsapp-float__tooltip {
  opacity: 1;
}

@keyframes whatsapp-pulse {
  0%, 100% { box-shadow: 0 4px 16px rgba(37, 211, 102, .4); }
  50% { box-shadow: 0 4px 16px rgba(37, 211, 102, .4), 0 0 0 12px rgba(37, 211, 102, .15); }
}

.whatsapp-float {
  animation: whatsapp-pulse 2s ease-in-out infinite;
}

.whatsapp-float:hover {
  animation: none;
}

/* ========== Back to Top Button ========== */
.back-to-top {
  position: fixed;
  bottom: 6rem;
  left: 2rem;
  z-index: 9997;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--white);
  color: var(--text-primary);
  border: 1px solid var(--gray-200, #e5e7eb);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm, 0 1px 2px rgba(0,0,0,0.05));
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--brand-blue);
  color: var(--white);
  border-color: var(--brand-blue);
  box-shadow: 0 4px 12px rgba(26, 86, 219, 0.3);
}

.back-to-top:active {
  transform: scale(0.92);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* ========== Copy Tip ========== */
.copy-tip {
  position: absolute;
  top: -2rem;
  left: 50%;
  transform: translateX(-50%) translateY(5px);
  background: var(--brand-blue-dark, #0f3d3e);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.625rem;
  border-radius: 4px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.copy-tip.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 767px) {
  .back-to-top {
    left: 1rem;
    bottom: 5rem;
    width: 40px;
    height: 40px;
  }
}

/* ========== Trademark Superscript ========== */
sup,
.tm-mark {
  font-size: 0.6em;
  vertical-align: super;
  line-height: 0;
  position: relative;
  top: -0.5em;
}