/* Shared site header/footer layout */

:root {
  --layout-bg: #f5f5f7;
  --layout-header-bg: rgba(245, 245, 247, 0.8);
  --layout-text: #1d1d1f;
  --layout-text-muted: #6e6e73;
  --layout-text-soft: #86868b;
  --layout-accent: #0071e3;
  --layout-accent-hover: #0077ed;
  --layout-overlay-dark: rgba(0, 0, 0, 0.04);
  --layout-menu-divider: rgba(0, 0, 0, 0.05);
  --layout-mobile-menu-bg: rgba(245, 245, 247, 0.42);
  --layout-mobile-menu-border: rgba(0, 0, 0, 0.04);
  --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: 12px 24px;
  --layout-footer-padding: 48px 24px 24px;
  --layout-footer-margin-top: 64px;
  --layout-menu-gap: 8px;
  --layout-link-padding: 8px 16px;
  --layout-footer-gap: 32px;
  --layout-footer-mobile-gap: 24px;
  --layout-pill-radius: 20px;
  --layout-link-radius: 12px;
  --layout-icon-size: 20px;
  --layout-logo-height: 44px;
  --layout-header-blur: 20px;
  --layout-mobile-menu-blur: 25px;
  --layout-mobile-menu-saturate: 150%;
  --layout-mobile-header-offset: 60px;
  --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;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--layout-header-padding);
  background: var(--layout-header-bg);
  backdrop-filter: blur(var(--layout-header-blur));
  -webkit-backdrop-filter: blur(var(--layout-header-blur));
  border-bottom: 1px solid rgba(255, 255, 255, 0.22);
  position: sticky;
  top: 0;
  z-index: 999;
  transition:
    transform 0.3s ease,
    background-color 0.3s ease,
    border-color 0.3s ease;
}

.header.hide {
  transform: translateY(-100%);
}

.logo img {
  height: var(--layout-logo-height);
  width: auto;
}

.menu {
  display: flex;
  gap: var(--layout-menu-gap);
  align-items: center;
}

.menu a {
  text-decoration: none;
  color: var(--layout-text);
  padding: var(--layout-link-padding);
  font-size: 14px;
  font-weight: 400;
  border-radius: var(--layout-link-radius);
  transition: all 0.2s ease;
}

.menu a:hover {
  background: var(--layout-overlay-dark);
}

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

.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);
  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);
}

@media (max-width: 1024px) {
  .header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--layout-mobile-menu-bg);
    backdrop-filter: blur(var(--layout-mobile-menu-blur)) saturate(var(--layout-mobile-menu-saturate));
    -webkit-backdrop-filter: blur(var(--layout-mobile-menu-blur)) saturate(var(--layout-mobile-menu-saturate));
    border-bottom: 1px solid var(--layout-mobile-menu-border);
    overflow: hidden;
    transition:
      transform 0.3s ease,
      padding-bottom 0.48s cubic-bezier(0.22, 1, 0.36, 1);
  }

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

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

  .menu {
    position: absolute;
    top: var(--layout-mobile-header-offset);
    left: 0;
    right: 0;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    background: transparent;
    border-top: 1px solid var(--layout-menu-divider);
    box-shadow: none;
    max-height: 0;
    opacity: 0;
    pointer-events: none;
    transform: translateY(0) 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-bottom: 1px solid var(--layout-menu-divider);
    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: translateY(0) scaleY(1);
    padding-top: 8px;
    padding-bottom: 10px;
  }

  .header:has(.menu.show) {
    padding-bottom: var(--layout-open-menu-height);
    backdrop-filter: blur(var(--layout-mobile-menu-blur)) saturate(var(--layout-mobile-menu-saturate));
    -webkit-backdrop-filter: blur(var(--layout-mobile-menu-blur)) saturate(var(--layout-mobile-menu-saturate));
  }

  .menu-toggle {
    display: block;
  }

  .menu-toggle span {
    background: #111;
  }

  @media (prefers-reduced-motion: reduce) {
    .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;
  }
}