/* ========================================
   YOYAGE Layout Styles
   Purpose: site header, navigation, mega menu,
            mobile nav, main content offset, footer
   Loaded on every page after base.css
   ======================================== */

/* ---------- 1. Main Content Offset ---------- */
:root {
  --expo-bar-h: 44px;
}

.main-content {
  padding-top: calc(72px + var(--expo-bar-h)); /* header + expo bar */
}

/* Promo bar dismissed for this browsing session: fold the layout back */
body.expo-bar-hidden {
  --expo-bar-h: 0px;
}

body.expo-bar-hidden .expo-bar {
  display: none;
}

/* ---------- 2. VALVE WORLD EXPO 2026 Promo Bar ---------- */
.expo-bar {
  height: var(--expo-bar-h);
  overflow: hidden;
  background-color: var(--color-bg-alt);
  color: var(--color-title);
}

.expo-bar-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  height: 100%;
}

/* Tag + show details stay centered in the bar */
.expo-bar-main {
  grid-column: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-width: 0;
  font-size: var(--fs-eyebrow);
  color: var(--color-title);
}

/* Only the exhibition name carries the red identity */
.expo-bar-tag {
  flex-shrink: 0;
  padding: 4px 10px;
  border-radius: var(--radius-tag);
  background-color: var(--color-expo-red);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.04em;
  color: var(--color-white);
  white-space: nowrap;
  transition: background-color var(--transition-fast);
}

.expo-bar-main:hover .expo-bar-tag {
  background-color: var(--color-expo-red-dark);
}

.expo-bar-text {
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-expo-gold);
}

.expo-bar-arrow {
  display: flex;
  flex-shrink: 0;
  color: var(--color-text-muted);
}

.expo-bar-arrow svg {
  width: 12px;
  height: 12px;
}

.expo-bar-main:hover .expo-bar-arrow {
  color: var(--color-expo-red);
}

.expo-bar-actions {
  grid-column: 3;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 14px;
}

.expo-bar-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  border-radius: 50%;
  color: var(--color-text-muted);
}

.expo-bar-close:hover {
  color: var(--color-expo-red);
  background-color: rgba(16, 24, 45, 0.06);
}

.expo-bar-close svg {
  width: 12px;
  height: 12px;
}

/* ---------- 3. Header ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

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

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 40px;
  font-weight: 800;
  color: var(--color-title);
  letter-spacing: 0.04em;
}

.logo img {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
}

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

.main-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: var(--fs-body);
  font-weight: 500;
  color: var(--color-title);
  position: relative;
}

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

.nav-item.has-dropdown {
  position: relative;
  padding-bottom: 24px;
  margin-bottom: -24px;
}

.nav-item.has-dropdown > .nav-link::after {
  content: "\25BC";
  font-size: 10px;
  margin-left: 6px;
  color: var(--color-text-muted);
}

/* ---------- 3. Mega Menu ---------- */
.mega-menu {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-menu);
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
  pointer-events: none;
}

.nav-item.has-dropdown:hover .mega-menu,
.mega-menu.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mega-menu-grid {
  display: grid;
  gap: 12px;
}

.mega-menu-grid.cols-4 {
  grid-template-columns: repeat(4, minmax(180px, auto));
  align-items: stretch;
}

.mega-menu-grid.cols-2 {
  grid-template-columns: repeat(2, auto);
  align-items: stretch;
}

.mega-menu-grid.cols-2-1 {
  grid-template-columns: auto auto;
  align-items: stretch;
  gap: 12px;
}

.mega-menu-grid.cols-2-1 > .mega-link-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  height: 100%;
}

.mega-menu-grid.cols-2-1 > .mega-link-list .icon-btn {
  flex: 1;
  min-height: 0;
  white-space: nowrap;
}

/* Resources menu (standalone link list): single-line items,
   all items share the width of the longest one via flex stretch */
.mega-menu > .mega-link-list .icon-btn {
  white-space: nowrap;
}

/* Products 菜单顶部两个入口按钮：并排各占一半，铺满下拉宽度 */
.mega-menu-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.mega-menu-tab {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px 16px;
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--color-title);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.mega-menu-tab:hover {
  border-color: var(--color-brand);
  color: var(--color-brand);
}

.mega-card {
  display: block;
  padding: 12px;
}

.mega-menu-grid.cols-2 .mega-card {
  padding: 10px;
}

.mega-card-title {
  font-size: var(--fs-small);
  font-weight: 700;
  color: var(--color-title);
  line-height: 1.4;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.mega-card--image {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.mega-card--image .mega-card-title {
  text-align: center;
  margin-bottom: 0;
  min-height: calc(var(--fs-small) * 1.4 * 2); /* reserve two lines for equal card heights */
}

.mega-card-img {
  aspect-ratio: 4 / 3;
  margin-bottom: 12px;
  border-radius: var(--radius-tag);
  overflow: hidden;
  background-color: var(--color-bg-alt);
}

/* About / Service menus: fixed 160 x 90 thumbnails */
.mega-menu-grid.cols-2 .mega-card-img {
  aspect-ratio: auto;
  width: 160px;
  height: 90px;
  align-self: center;
}

/* About / Service image cards: keep the composed card height while the
   flex column (justify-content: center) centers the image + title group,
   so top and bottom gaps stay equal even with one-line titles */
.mega-menu-grid.cols-2 .mega-card--image {
  min-height: 163px; /* 90px image + 12px gap + two-line title + 20px padding + 2px border */
}

.mega-menu-grid.cols-2 .mega-card--image .mega-card-title {
  min-height: 0; /* free space is distributed by the card's flex centering instead */
}

.mega-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.mega-link-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}

.mega-link-list:last-child {
  margin-bottom: 0;
}

.mega-link-list a {
  font-size: var(--fs-small);
  color: var(--color-text);
}

.mega-link-list a:hover {
  color: var(--color-brand);
}

.icon-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  color: var(--color-title);
  font-size: var(--fs-small);
  font-weight: 600;
  transition: border-color var(--transition-fast);
}

.icon-btn:hover {
  border-color: var(--color-brand);
  color: var(--color-brand);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  fill: currentColor;
}

/* ---------- 4. Mobile Navigation ---------- */
.mobile-menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  color: var(--color-title);
}

.mobile-menu-toggle svg {
  width: 24px;
  height: 24px;
}

.mobile-nav {
  display: none;
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding-top: 8px;
  padding-bottom: 24px;
  max-height: calc(100vh - 72px - var(--expo-bar-h));
  max-height: calc(100dvh - 72px - var(--expo-bar-h));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.mobile-nav.is-open {
  display: block;
}

.mobile-nav-list,
.mobile-nav-list ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-nav-list > li {
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 10px 0;
  font-size: var(--fs-body);
  color: var(--color-title);
}

.mobile-nav-link:hover {
  color: var(--color-brand);
}

.mobile-nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.mobile-nav-row .mobile-nav-link {
  flex: 1;
  border-bottom: none;
}

.mobile-submenu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 80px;
  height: 48px;
  flex-shrink: 0;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-left: 1px solid var(--color-border);
  cursor: pointer;
  transition: transform 0.2s ease, color 0.2s ease;
}

.mobile-submenu-toggle:hover {
  color: var(--color-brand);
}

.mobile-submenu-toggle[aria-expanded="true"] {
  transform: rotate(180deg);
  color: var(--color-brand);
}

.mobile-submenu {
  display: none;
  padding-left: 16px;
  background-color: rgba(0, 100, 124, 0.04);
  border-top: 1px solid var(--color-border);
}

.mobile-submenu.is-open {
  display: block;
}

.mobile-submenu .mobile-nav-row .mobile-nav-link {
  padding-left: 8px;
}

.mobile-submenu .mobile-submenu .mobile-nav-row .mobile-nav-link {
  padding-left: 16px;
}

.mobile-submenu .mobile-submenu .mobile-submenu .mobile-nav-link {
  padding-left: 24px;
}

.mobile-nav-link--sub {
  font-size: var(--fs-small);
}

.mobile-nav-cta {
  margin-top: 16px;
}

/* ---------- 5. Footer ---------- */
.site-footer {
  background-color: var(--color-footer-bg);
  color: var(--color-footer-text);
  border-top: 3px solid var(--color-footer-accent);
}

.footer-main {
  padding-top: 64px;
  padding-bottom: 48px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1.4fr;
  gap: 32px;
}

.footer-column {
  text-align: center;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 40px;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: 0.04em;
  margin-bottom: 16px;
}

.footer-logo img {
  width: 56px;
  height: 56px;
  display: block;
  filter: brightness(0) invert(1);
}

.footer-logo:hover {
  color: var(--color-brand);
}

.footer-desc {
  font-size: var(--fs-body);
  font-weight: 500;
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-badges {
  display: flex;
  justify-content: center;
  gap: 10px;
}

.footer-badge {
  display: inline-flex;
  padding: 6px 12px;
  border: 1px solid var(--color-footer-border);
  border-radius: var(--radius-tag);
  font-size: var(--fs-body);
  font-weight: 600;
  color: var(--color-footer-link);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.footer-badge:hover {
  border-color: var(--color-brand);
  color: var(--color-brand);
}

.footer-column-title {
  font-size: calc(var(--fs-body) * 1.3);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 18px;
  letter-spacing: 0.04em;
}

.footer-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.footer-links a {
  font-size: var(--fs-body);
  font-weight: 500;
  color: var(--color-footer-link);
}

.footer-links a:hover {
  color: var(--color-brand);
}

.footer-contact-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.footer-contact-item:last-child {
  margin-bottom: 0;
}

.footer-contact-label {
  font-size: var(--fs-body);
  font-weight: 600;
  color: var(--color-footer-text);
}

.footer-contact-value {
  font-size: var(--fs-body);
  font-weight: 500;
  color: var(--color-footer-link);
}

.footer-contact-value:hover {
  color: var(--color-brand);
}

.footer-bottom {
  border-top: 1px solid var(--color-footer-border);
  padding-top: 24px;
  padding-bottom: 24px;
  text-align: center;
}

.footer-copyright {
  font-size: var(--fs-small);
  color: var(--color-footer-text);
}

/* ---------- 6. Responsive ---------- */
@media (max-width: 991px) {
  .main-nav {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767px) {
  :root {
    --expo-bar-h: 40px;
  }

  .expo-bar-inner {
    gap: 10px;
  }

  .expo-bar-main {
    font-size: 12px;
  }

  .expo-bar-detail {
    display: none;
  }

  .expo-bar-actions {
    gap: 10px;
  }

  .footer-main {
    padding-top: 40px;
    padding-bottom: 32px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-logo {
    margin-bottom: 12px;
  }

  .footer-desc {
    margin-bottom: 16px;
    line-height: 1.6;
  }

  .footer-column-title {
    margin-bottom: 12px;
  }

  .footer-links {
    gap: 8px;
  }

  .footer-contact-item {
    margin-bottom: 10px;
  }

  .footer-bottom {
    padding-top: 20px;
    padding-bottom: 20px;
  }
}