/* ============================================================
   Layout — Promo, Header, Nav, Footer, Grids
   ============================================================ */

/* Promo bar */
.promo-bar {
  position: sticky;
  top: 0;
  z-index: calc(var(--z-sticky) + 1);
  background: var(--gradient-promo);
  color: #fff;
  text-align: center;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  padding: 0.55rem 1rem;
  letter-spacing: 0.02em;
}

.promo-bar a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Site header */
.site-header {
  position: sticky;
  top: var(--promo-h);
  z-index: var(--z-sticky);
  background: rgba(250, 247, 244, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition:
    box-shadow var(--duration) var(--ease),
    border-color var(--duration) var(--ease),
    background var(--duration) var(--ease);
}

.site-header.is-sticky {
  box-shadow: var(--shadow-sm);
  border-bottom-color: var(--color-line);
  background: rgba(255, 255, 255, 0.96);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: var(--header-h);
}

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo img {
  height: 2.75rem;
  width: auto;
}

/* Desktop nav */
.nav-desktop {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

.nav-desktop > li {
  position: relative;
}

.nav-desktop > li > a,
.nav-desktop .nav-trigger {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.65rem 0.85rem;
  color: var(--color-ink);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  letter-spacing: 0.02em;
  white-space: nowrap;
  border-radius: var(--radius-sm);
  transition: color var(--duration) var(--ease), background var(--duration) var(--ease);
}

.nav-desktop > li > a:hover,
.nav-desktop > li > a.is-active,
.nav-desktop .nav-trigger:hover {
  color: var(--color-brand);
  background: rgba(200, 16, 46, 0.06);
}

.nav-desktop .nav-trigger::after {
  content: "";
  width: 0.4rem;
  height: 0.4rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  opacity: 0.7;
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 0.35rem);
  left: 0;
  min-width: 14rem;
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(0.5rem);
  transition:
    opacity var(--duration) var(--ease),
    transform var(--duration) var(--ease),
    visibility var(--duration);
}

.nav-desktop > li:hover > .nav-dropdown,
.nav-desktop > li:focus-within > .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown a {
  display: block;
  padding: 0.65rem 0.85rem;
  color: var(--color-ink-soft);
  font-size: var(--fs-sm);
  border-radius: var(--radius-sm);
}

.nav-dropdown a:hover {
  background: var(--color-surface-alt);
  color: var(--color-brand);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-ink-soft);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-line);
}

.lang-switch:hover {
  border-color: var(--color-brand);
  color: var(--color-brand);
}

.lang-switch img {
  width: 1.25rem;
  height: auto;
  border-radius: 2px;
}

html[lang="zh-HK"] .lang-switch,
html[lang="zh-HK"] .nav-mobile__list li:has(> a[href^="en/"]) {
  display: none;
}

/* Hamburger */
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
}

.menu-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav drawer */
.nav-mobile {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  pointer-events: none;
}

.nav-mobile__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(26, 26, 26, 0.45);
  opacity: 0;
  transition: opacity var(--duration) var(--ease);
}

.nav-mobile__panel {
  position: absolute;
  top: 0;
  right: 0;
  width: min(20rem, 88vw);
  height: 100%;
  background: #fff;
  padding: calc(var(--header-h) + var(--promo-h) + 1rem) var(--space-5) var(--space-6);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform var(--duration) var(--ease);
  box-shadow: var(--shadow-lg);
}

.nav-mobile.is-open {
  pointer-events: auto;
}

.nav-mobile.is-open .nav-mobile__backdrop {
  opacity: 1;
}

.nav-mobile.is-open .nav-mobile__panel {
  transform: translateX(0);
}

.nav-mobile__list a {
  display: block;
  padding: 0.85rem 0;
  color: var(--color-ink);
  font-weight: var(--fw-medium);
  border-bottom: 1px solid var(--color-line);
}

.nav-mobile__list .nav-sub {
  padding-left: var(--space-4);
}

.nav-mobile__list .nav-sub a {
  font-size: var(--fs-sm);
  font-weight: var(--fw-regular);
  color: var(--color-ink-soft);
}

body.nav-open {
  overflow: hidden;
}

@media (min-width: 1024px) {
  .nav-desktop { display: flex; }
  .menu-toggle { display: none; }
  .nav-mobile { display: none; }
}

/* Footer */
.site-footer {
  background: var(--gradient-footer);
  color: #c8c4c0;
  padding-top: var(--space-8);
}

.footer-grid {
  display: grid;
  gap: var(--space-7);
  padding-bottom: var(--space-7);
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
}

.footer-brand__logo {
  height: 2.5rem;
  width: auto;
  margin-bottom: var(--space-4);
  filter: brightness(0) invert(1);
}

.footer-brand p {
  font-size: var(--fs-sm);
  line-height: var(--lh-body);
  max-width: 22rem;
  margin-bottom: var(--space-5);
}

.footer-contact {
  font-size: var(--fs-sm);
  margin-bottom: var(--space-4);
}

.footer-contact a {
  color: #fff;
}

.social-links {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  align-items: center;
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 50%;
  color: #fff;
  transition:
    background var(--duration) var(--ease),
    border-color var(--duration) var(--ease),
    color var(--duration) var(--ease),
    transform var(--duration) var(--ease);
}

.social-links a:hover {
  background: var(--color-brand);
  border-color: var(--color-brand);
  color: #fff;
  transform: translateY(-2px);
}

.social-links svg {
  width: 1.15rem;
  height: 1.15rem;
  fill: currentColor;
  display: block;
}

.footer-col h4 {
  color: #fff;
  font-size: var(--fs-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

.footer-col ul li + li {
  margin-top: var(--space-2);
}

.footer-col a {
  color: #c8c4c0;
  font-size: var(--fs-sm);
}

.footer-col a:hover {
  color: #fff;
}

.footer-subscribe {
  margin-top: var(--space-5);
}

.footer-subscribe h4 {
  margin-bottom: var(--space-3);
}

.footer-disclaimer {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--space-5) 0;
  font-size: var(--fs-xs);
  line-height: 1.65;
  color: #8a8682;
}

.footer-disclaimer strong {
  color: #b0aba6;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: var(--space-4) 0;
  font-size: var(--fs-xs);
  text-align: center;
  color: #8a8682;
}

/* Content grids */
.grid-2 {
  display: grid;
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  gap: var(--space-5);
}

.grid-4 {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 640px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.stack > * + * {
  margin-top: var(--space-4);
}

.split {
  display: grid;
  gap: var(--space-7);
  align-items: center;
}

@media (min-width: 900px) {
  .split {
    grid-template-columns: 1fr 1fr;
  }

  .split--reverse > :first-child {
    order: 2;
  }
}