/* Shared site header/footer layout */

:root {
  --layout-bg: #f5f5f7;
  --layout-header-bg: linear-gradient(135deg, rgba(255, 255, 255, 0.56), rgba(255, 255, 255, 0.24));
  --layout-text: #1d1d1f;
  --layout-text-muted: #6e6e73;
  --layout-text-soft: #86868b;
  --layout-accent: #0071e3;
  --layout-accent-hover: #0077ed;
  --layout-overlay-dark: rgba(255, 255, 255, 0.3);
  --layout-menu-divider: rgba(255, 255, 255, 0.2);
  --layout-mobile-menu-bg: linear-gradient(135deg, rgba(255, 255, 255, 0.52), rgba(255, 255, 255, 0.18));
  --layout-mobile-menu-border: rgba(255, 255, 255, 0.34);
  --layout-mobile-menu-text-shadow: 0 0 6px rgba(255, 255, 255, 0.2);
  --layout-mobile-menu-text-shadow-hover: 0 0 12px rgba(255, 255, 255, 0.6);
  --layout-header-padding: 18px 18px 8px;
  --layout-footer-padding: 48px 24px 24px;
  --layout-footer-margin-top: 64px;
  --layout-menu-gap: 10px;
  --layout-link-padding: 10px 18px;
  --layout-footer-gap: 32px;
  --layout-footer-mobile-gap: 24px;
  --layout-pill-radius: 999px;
  --layout-link-radius: 999px;
  --layout-icon-size: 20px;
  --layout-logo-height: 38px;
  --layout-logo-button-size: 56px;
  --layout-header-max-width: 1160px;
  --layout-header-side-gap: 16px;
  --layout-header-blur: 18px;
  --layout-mobile-menu-blur: 20px;
  --layout-mobile-menu-saturate: 180%;
  --layout-mobile-header-offset: 86px;
  --layout-open-menu-height: 0px;
  --layout-lazy-load-transition: all 0.6s ease-out;
  --layout-fade-in-transition: opacity 0.6s ease-out;
  --layout-toast-gap: 12px;
  --layout-toast-top: var(--layout-toast-gap);
  --layout-toast-right: 20px;
  --layout-toast-max-width: 50vw;
  --layout-page-transition-duration: 180ms;
  --layout-header-fixed-offset: 0px;
  --layout-mobile-header-fixed-offset: 0px;
  --layout-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --layout-glass-control-bg: rgba(255, 255, 255, 0.2);
  --layout-glass-control-hover-bg: rgba(255, 255, 255, 0.24);
  --layout-glass-edge-shadow:
    rgba(242, 242, 242, 0.8) 2px 2px 3px -3px inset,
    rgba(242, 242, 242, 0.8) -2px -2px 3px -3px inset,
    rgba(255, 255, 255, 0.8) -3px -3px 0.8px -3.5px inset,
    rgba(255, 255, 255, 0.8) 3px 3px 0.8px -3.5px inset,
    rgba(0, 0, 0, 0.1) 0 0 8px 0;
  --layout-liquid-glass-shadow:
    rgba(242, 242, 242, 0.8) 2px 2px 3px -3px inset,
    rgba(242, 242, 242, 0.8) -2px -2px 3px -3px inset,
    rgba(255, 255, 255, 0.8) -3px -3px 0.8px -3.5px inset,
    rgba(255, 255, 255, 0.8) 3px 3px 0.8px -3.5px inset,
    rgba(0, 0, 0, 0.1) 0 0 8px 0;
}

body.site-page-transition-init .site-transition-target {
  opacity: 0;
  transform: translateY(4px);
  transition:
    opacity var(--layout-page-transition-duration) ease,
    transform var(--layout-page-transition-duration) ease;
}

body.site-page-transition-init.site-page-ready .site-transition-target {
  opacity: 1;
  transform: translateY(0);
}

body.site-page-transition-init.site-page-transitioning .site-transition-target {
  opacity: 0;
  transform: translateY(4px);
  pointer-events: none;
}

body {
  padding-top: calc(var(--layout-logo-button-size) + var(--layout-header-fixed-offset) + 28px);
}

.header {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: var(--layout-header-padding);
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  position: fixed;
  top: var(--layout-header-fixed-offset);
  left: 0;
  right: 0;
  z-index: 999;
  isolation: isolate;
  width: 100%;
  margin: 0;
  overflow: visible;
  transition:
    transform 0.3s ease;
}

.header::before {
  content: none;
}

.logo,
.header nav,
.header-actions {
  position: relative;
  z-index: 1;
}

.header nav {
  display: flex;
  justify-content: center;
  min-width: 0;
}

.logo img {
  height: var(--layout-logo-height);
  max-width: var(--layout-logo-height);
  width: auto;
  object-fit: contain;
}

.logo a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--layout-logo-button-size);
  height: var(--layout-logo-button-size);
  background: var(--layout-glass-control-bg);
  border: 0;
  border-radius: 50%;
  box-shadow: var(--layout-liquid-glass-shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  overflow: hidden;
  transition:
    background 0.2s ease,
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.logo a:hover {
  background: var(--layout-glass-control-hover-bg);
  transform: translateY(-1px);
}

.menu {
  display: flex;
  gap: var(--layout-menu-gap);
  align-items: center;
  justify-content: center;
  width: fit-content;
  max-width: 100%;
  margin: 0 auto;
  padding: 4px;
  background: var(--layout-glass-control-bg);
  border: 0;
  border-radius: var(--layout-pill-radius);
  box-shadow: var(--layout-liquid-glass-shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.header-actions {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
}

.lang-switcher {
  display: inline-flex;
  align-items: center;
  position: relative;
  gap: 0;
  padding: 3px;
  white-space: nowrap;
  background: var(--layout-glass-control-bg);
  border: 0;
  border-radius: 999px;
  box-shadow: var(--layout-liquid-glass-shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-size: 14px;
  font-weight: 650;
  line-height: 1;
  overflow: hidden;
}

.lang-switcher::before {
  content: "";
  position: absolute;
  top: 2px;
  bottom: 2px;
  left: 2px;
  width: calc(50% - 2px);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.58);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow:
    var(--layout-liquid-glass-shadow),
    0 1px 2px rgba(0, 0, 0, 0.08);
  transition: transform 0.24s cubic-bezier(0.22, 1, 0.36, 1);
}

.lang-switcher.lang-en::before {
  transform: translateX(100%);
}

.lang-switcher.is-switching {
  pointer-events: none;
}

.lang-switcher:hover {
  background: var(--layout-glass-control-hover-bg);
}

.lang-switcher a {
  position: relative;
  z-index: 1;
  min-width: 40px;
  padding: 9px 11px;
  color: var(--layout-text-muted);
  text-decoration: none;
  line-height: 1;
  text-align: center;
  border-radius: 999px;
  transition: color 0.2s ease;
}

.lang-switcher a:hover,
.lang-switcher a.active {
  color: var(--layout-text);
}

.lang-switcher.lang-vi a[hreflang="vi"],
.lang-switcher.lang-en a[hreflang="en"] {
  color: var(--layout-text);
}

.menu a {
  text-decoration: none;
  color: var(--layout-text);
  padding: var(--layout-link-padding);
  font-size: 15px;
  font-weight: 400;
  border-radius: var(--layout-link-radius);
  transition: all 0.2s ease;
}

.menu a:hover {
  background: var(--layout-overlay-dark);
  box-shadow: var(--layout-liquid-glass-shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  width: 24px;
  height: 24px;
  position: relative;
  z-index: 1000;
  border-radius: 50%;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--layout-text);
  border-radius: 2px;
  position: absolute;
  left: 0;
  transition: all 0.3s ease;
}

.menu-toggle span:nth-child(1) { top: 4px; }
.menu-toggle span:nth-child(2) { top: 11px; }
.menu-toggle span:nth-child(3) { top: 18px; }

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg);
  top: 11px;
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg);
  top: 11px;
}

.footer {
  padding: var(--layout-footer-padding);
  margin-top: var(--layout-footer-margin-top);
  font-family: var(--layout-font-family);
  background: var(--layout-bg);
}

.footer-container {
  max-width: 980px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--layout-footer-gap);
}

.footer-column h6 {
  font-size: 13px;
  font-weight: 600;
  color: var(--layout-text);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-column ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-column ul li {
  margin-bottom: 8px;
}

.footer-column a {
  text-decoration: none;
  color: var(--layout-text-muted);
  font-size: 14px;
  transition: color 0.2s ease;
}

.footer-column a:hover {
  color: var(--layout-accent);
}

.footer-column p {
  color: var(--layout-text-soft);
  font-size: 12px;
  margin-top: 32px;
}

.group-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--layout-menu-gap);
  padding: 10px 20px;
  background: var(--layout-accent);
  color: #fff !important;
  border-radius: var(--layout-pill-radius);
  font-weight: 500;
  transition: all 0.2s ease;
}

.group-btn:hover {
  background: var(--layout-accent-hover);
  transform: translateY(-1px);
}

.icon-community {
  width: var(--layout-icon-size);
  height: var(--layout-icon-size);
  fill: currentColor;
}

.footer-column:last-child {
  grid-column: 1 / -1;
  text-align: center;
}

.lazy-load {
  opacity: 0;
  transform: translateY(40px);
  transition: var(--layout-lazy-load-transition);
  will-change: opacity, transform;
}

.lazy-load.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in {
  opacity: 0;
  transition: var(--layout-fade-in-transition);
  will-change: opacity;
}

.fade-in.visible {
  opacity: 1;
}

.site-toast-container {
  position: fixed;
  top: var(--layout-toast-top);
  right: var(--layout-toast-right);
  z-index: 1400;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  width: auto;
  max-width: var(--layout-toast-max-width);
  pointer-events: none;
  transition: top 0.25s ease;
}

.site-toast {
  width: fit-content;
  max-width: 100%;
  padding: 14px 16px;
  border-radius: 12px;
  color: #fff;
  background: #2c2c2e;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  overflow-wrap: anywhere;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.site-toast.success {
  background: #34c759;
}

.site-toast.error {
  background: #ff3b30;
}

.site-toast.warning {
  background: #ff9500;
}

.site-toast.info {
  background: #2c2c2e;
}

.site-toast.show {
  opacity: 1;
  transform: translateY(0);
}

.site-language-suggestion {
  position: fixed;
  top: 22px;
  left: 50%;
  z-index: 1350;
  display: flex;
  align-items: center;
  gap: 22px;
  width: min(680px, calc(100vw - 32px));
  padding: 16px 18px;
  color: var(--layout-text);
  background: var(--layout-glass-control-bg);
  border: 0;
  border-radius: 18px;
  box-shadow: var(--layout-liquid-glass-shadow);
  backdrop-filter: blur(8px) saturate(180%);
  -webkit-backdrop-filter: blur(8px) saturate(180%);
  isolation: isolate;
  opacity: 0;
  transform: translate(-50%, calc(-100% - 44px)) scale(0.97);
  transition:
    opacity 0.38s ease,
    transform 0.58s cubic-bezier(0.32, 0, 0.67, 0);
}

.site-language-suggestion[hidden] {
  display: none;
}

.site-language-suggestion.show {
  opacity: 1;
  transform: translate(-50%, 0) scale(1);
  transition:
    opacity 0.42s ease,
    transform 0.82s cubic-bezier(0.16, 1, 0.3, 1);
}

.site-language-suggestion.is-morphing {
  transition: none !important;
  overflow: hidden;
  will-change: top, left, width, height, opacity, border-radius;
}

.site-language-morph-source {
  pointer-events: none !important;
  background: transparent !important;
  border-color: transparent !important;
  box-shadow: none !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
}

.menu.site-language-morph-labels-hidden a,
.lang-switcher.site-language-morph-labels-hidden a {
  opacity: 0 !important;
}

.menu.site-language-morph-labels-revealing a,
.lang-switcher.site-language-morph-labels-revealing a {
  transition: opacity 0.56s cubic-bezier(0.32, 0, 0.15, 1) !important;
}

.lang-switcher.site-language-morph-indicator-hidden::before {
  opacity: 0 !important;
}

.lang-switcher.site-language-morph-indicator-revealing::before {
  transition:
    opacity 0.56s cubic-bezier(0.32, 0, 0.15, 1),
    transform 0.24s cubic-bezier(0.22, 1, 0.36, 1) !important;
}

.site-language-suggestion-copy,
.site-language-suggestion-actions {
  will-change: opacity, transform;
}

.site-language-suggestion-copy {
  display: flex;
  flex: 1 1 auto;
  min-width: 0;
  flex-direction: column;
  gap: 3px;
}

.site-language-suggestion-copy strong {
  font-size: 15px;
  line-height: 1.3;
}

.site-language-suggestion-copy span {
  color: var(--layout-text-muted);
  font-size: 14px;
  line-height: 1.4;
}

.site-language-suggestion-actions {
  display: flex;
  flex: 0 0 auto;
  align-items: stretch;
  gap: 8px;
  width: 330px;
}

.site-language-suggestion-primary,
.site-language-suggestion-dismiss {
  appearance: none;
  display: inline-flex;
  flex: 1 1 0;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 10px 14px;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-size: 13px;
  font-weight: 650;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}

.site-language-suggestion-primary {
  color: #fff;
  background: var(--layout-accent);
}

.site-language-suggestion-primary:hover {
  color: #fff;
  background: var(--layout-accent-hover);
}

.site-language-suggestion-dismiss {
  color: var(--layout-text);
  background: var(--layout-glass-control-bg);
  box-shadow: var(--layout-liquid-glass-shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-language-suggestion-dismiss:hover {
  background: var(--layout-glass-control-hover-bg);
}

@media (max-width: 1024px) {
  .header {
    grid-template-columns: auto minmax(0, 1fr) auto;
    position: fixed;
    top: var(--layout-mobile-header-fixed-offset);
    left: 0;
    right: 0;
    width: 100%;
    margin: 0;
    padding: 10px 12px;
    background: transparent;
    border: 0;
    border-radius: 0;
    overflow: visible;
    transition:
      transform 0.3s ease,
      padding-bottom 0.48s cubic-bezier(0.22, 1, 0.36, 1);
  }

  body {
    padding-top: calc(var(--layout-mobile-header-offset) + var(--layout-mobile-header-fixed-offset));
  }

  .site-toast-container {
    right: 12px;
    max-width: 50vw;
  }

  .site-language-suggestion {
    top: 14px;
    align-items: stretch;
    flex-direction: column;
    gap: 12px;
    padding: 15px;
  }

  .site-language-suggestion-actions {
    width: 100%;
  }

  .site-language-suggestion-primary,
  .site-language-suggestion-dismiss {
    flex: 1 1 0;
  }

  .menu {
    position: fixed;
    top: 78px;
    left: 50vw;
    right: auto;
    width: min(calc(100vw - 32px), 340px);
    max-width: calc(100vw - 32px);
    flex-direction: column;
    gap: 0;
    justify-content: flex-start;
    align-items: stretch;
    background: rgba(255, 255, 255, 0.16);
    border: 0;
    border-radius: 16px;
    box-shadow: var(--layout-liquid-glass-shadow);
    max-height: 0;
    opacity: 0;
    pointer-events: none;
    transform: translateX(-50%) scaleY(0.98);
    transform-origin: top center;
    transition:
      max-height 0.48s cubic-bezier(0.22, 1, 0.36, 1),
      opacity 0.28s ease,
      transform 0.48s cubic-bezier(0.22, 1, 0.36, 1);
    z-index: 250;
    overflow: hidden;
    padding: 0 18px;
  }

  .menu::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="150" height="150"><filter id="n"><feTurbulence baseFrequency="0.8" numOctaves="2" stitchTiles="stitch"/><feColorMatrix type="saturate" values="0"/></filter><rect width="100%" height="100%" filter="url(%23n)" opacity="0.06"/></svg>');
    mix-blend-mode: overlay;
    opacity: 0.5;
  }

  .menu a {
    color: #111;
    font-size: 17px;
    line-height: 1.2;
    padding: 13px 0;
    width: 100%;
    text-align: center;
    border-radius: 12px;
    border-bottom: 0;
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.16) inset;
    text-shadow: var(--layout-mobile-menu-text-shadow);
    transition: color 0.2s ease, background-color 0.2s ease, text-shadow 0.2s ease;
  }

  .menu a:hover {
    color: #111;
    text-shadow: var(--layout-mobile-menu-text-shadow-hover);
  }

  .menu a:last-child {
    border-bottom: none;
  }

  .menu.show {
    max-height: var(--layout-open-menu-height);
    opacity: 1;
    pointer-events: auto;
    transform: translateX(-50%) scaleY(1);
    padding-top: 12px;
    padding-bottom: 10px;
  }

  .header:has(.menu.show) {
    padding-bottom: var(--layout-open-menu-height);
  }

  .logo a {
    width: 56px;
    height: 56px;
  }

  .logo img {
    height: 38px;
    max-width: 38px;
  }

  .menu-toggle {
    display: block;
    width: 46px;
    height: 46px;
    background: var(--layout-glass-control-bg);
    border: 0;
    box-shadow: var(--layout-liquid-glass-shadow);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
  }

  .menu-toggle:hover {
    background: var(--layout-glass-control-hover-bg);
  }

  .header-actions {
    grid-column: 3;
    gap: 12px;
  }

  .lang-switcher {
    font-size: 14px;
    padding: 4px;
    backdrop-filter: blur(8px) saturate(180%);
    -webkit-backdrop-filter: blur(8px) saturate(180%);
  }

  .lang-switcher a {
    min-width: 44px;
    padding: 11px 11px;
  }

  .menu-toggle span {
    left: 12px;
    width: 21px;
    background: #111;
  }

  .menu-toggle span:nth-child(1) { top: 13px; }
  .menu-toggle span:nth-child(2) { top: 22px; }
  .menu-toggle span:nth-child(3) { top: 31px; }

  .menu-toggle.active span:nth-child(1),
  .menu-toggle.active span:nth-child(3) {
    top: 22px;
  }

  @media (prefers-reduced-motion: reduce) {
    .site-language-suggestion,
    .site-language-suggestion.show {
      transition: none;
    }

    body.site-page-transition-init .site-transition-target {
      transition: none;
      transform: none;
    }

    .menu {
      transition: none;
    }
  }

  .footer-container {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--layout-footer-mobile-gap);
  }

  .footer-community,
  .footer-copyright {
    grid-column: 1 / -1;
  }

  .footer-contact,
  .footer-tools {
    grid-column: 1;
  }

  .footer-learn {
    grid-column: 2;
    grid-row: span 2;
  }
}