.site-shell {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
}

.top-alert,
.site-header,
.hero,
.stats,
.section,
.page-hero,
.page-title,
.activity-detail,
.article-layout,
.article-breadcrumb,
.article-detail-layout,
.footer-inner {
  width: min(var(--max), calc(100% - var(--space-page)));
  margin-left: auto;
  margin-right: auto;
}

.top-alert {
  margin-top: 18px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 10px 16px;
  border-radius: 24px;
  background: rgba(255, 255, 255, .72);
  border: 1px solid rgba(229, 235, 230, .9);
  box-shadow: 0 6px 20px rgba(29, 37, 35, .06);
  backdrop-filter: blur(18px);
  font-size: 14px;
}
.top-alert strong { color: var(--green-dark); }

.site-header {
  position: sticky;
  top: 16px;
  z-index: 20;
  margin-top: 10px;
  padding: 9px 12px 9px 16px;
  display: grid;
  grid-template-columns: 132px 1fr auto;
  align-items: center;
  gap: 16px;
  border-radius: 24px;
  background: rgba(255, 255, 255, .78);
  border: 1px solid rgba(255, 255, 255, .88);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(22px);
}
.brand img { display: block; width: 116px; }
.main-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2px;
  color: #45504D;
  font-size: 14px;
}
.main-nav a,
.nav-item > a {
  display: inline-flex;
  padding: 9px 11px;
  border-radius: 999px;
  white-space: nowrap;
}
.main-nav a:hover,
.main-nav a:focus-visible,
.nav-item:hover > a,
.nav-item:focus-within > a {
  background: var(--green-soft);
  color: var(--green-dark);
}
.nav-item {
  position: relative;
}
.submenu {
  position: absolute;
  left: 50%;
  top: calc(100% - 1px);
  min-width: 220px;
  display: grid;
  gap: 4px;
  padding: 12px 10px 10px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, .94);
  box-shadow: var(--shadow-soft);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 0);
  transition: opacity .16s ease;
}
.nav-item:hover .submenu,
.nav-item:focus-within .submenu {
  opacity: 1;
  pointer-events: auto;
}
.submenu a {
  justify-content: flex-start;
  padding: 10px 12px;
  border-radius: 12px;
  white-space: normal;
  line-height: 1.2;
}
.header-actions { display: flex; align-items: center; gap: 8px; }

.section { margin-top: 82px; }
.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 26px;
}
.section-head p { max-width: 430px; }

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 24px;
  align-items: start;
}

.site-footer {
  margin-top: 90px;
  padding: 42px 0;
  background: var(--footer);
  color: rgba(255, 255, 255, .82);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr .8fr .8fr;
  gap: 36px;
}
.footer-inner h2 {
  margin-bottom: 12px;
  color: var(--white);
  font-size: 22px;
}
.footer-inner p,
.footer-inner a {
  display: block;
  margin-bottom: 8px;
  color: rgba(255, 255, 255, .72);
  font-size: 14px;
  line-height: 1.5;
}
.legal-links { display: flex; flex-wrap: wrap; gap: 8px 14px; margin-top: 18px; }

@media (max-width: 980px) {
  .site-header { grid-template-columns: 132px 1fr auto; }
  .main-nav, .header-actions { display: none; }
  .two-col, .footer-inner, .article-layout { grid-template-columns: 1fr; }
  .section-head { display: block; }
}

@media (max-width: 560px) {
  .top-alert { align-items: flex-start; border-radius: 26px; font-size: 12px; }
  .site-header { grid-template-columns: 1fr auto; border-radius: 28px; }
  .brand img { width: 112px; }
  .section { margin-top: 64px; }
}