.page {
  min-height: 100vh;
  display: grid;
  grid-template-rows: var(--header-height) var(--nav-height) 1fr var(--footer-height);
}

.site-header {
  background: var(--header-bg);
  color: var(--header-text);
  display: flex;
  align-items: center;
  padding: 0 32px;
  font-size: 20px;
  font-weight: 600;
}

.top-nav {
  background: #111827;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.top-nav button {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: #f8fafc;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 400;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  min-height: 36px;
  line-height: 1.5;
}

.top-nav button.is-active {
  background: #f8fafc;
  color: #111827;
  font-weight: 400;
}

.layout-main {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr) 240px;
  gap: 20px;
  padding: 20px 32px;
  min-height: 0;
}

.left-nav {
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--panel-shadow);
  padding: 16px;
  overflow-y: auto;
}

.left-nav h2 {
  margin: 0 0 12px;
  font-size: 16px;
}

.left-nav .subcategory-title {
  margin: 16px 0 8px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: #94a3b8;
}

.left-nav .nav-item {
  width: 100%;
  text-align: left;
  background: #f1f5f9;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--muted-text);
  margin-bottom: 8px;
  border: none;
  cursor: pointer;
}

.left-nav .nav-item.is-active {
  background: #2563eb;
  color: #f8fafc;
}

.center-column {
  display: grid;
  grid-template-rows: minmax(220px, 1fr) minmax(220px, 1fr);
  gap: 20px;
  min-height: 0;
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  box-shadow: var(--panel-shadow);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.panel h3 {
  margin: 0;
  font-size: 16px;
}

.panel .placeholder {
  color: var(--muted-text);
  font-size: 14px;
}

.ads-column {
  display: grid;
  grid-template-rows: minmax(220px, 1fr) minmax(220px, 1fr);
  gap: 20px;
  min-height: 0;
}

.ad-panel {
  background: #f8fafc;
  border: 1px dashed #cbd5f5;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted-text);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.site-footer {
  border-top: 1px solid var(--border-color);
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  color: var(--muted-text);
  font-size: 14px;
}

.site-footer a {
  color: var(--muted-text);
}

@media (max-width: 1024px) {
  .layout-main {
    grid-template-columns: 200px minmax(0, 1fr) 200px;
    padding: 20px;
  }
}

@media (max-width: 860px) {
  .page {
    grid-template-rows: var(--header-height) var(--nav-height) auto var(--footer-height);
  }

  .layout-main {
    grid-template-columns: 1fr;
  }

  .ads-column {
    grid-template-rows: minmax(180px, 1fr) minmax(180px, 1fr);
  }
}