.app-shell { display: grid; grid-template-columns: 300px minmax(0, 1fr); min-height: 100vh; }
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 24px;
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: blur(16px);
  display: flex;
  flex-direction: column;
  gap: 20px;
  z-index: 10;
}
.content {
  width: min(100%, var(--container));
  margin: 0 auto;
  padding: 24px;
  display: grid;
  gap: 20px;
}
.topbar {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 16px;
  align-items: center;
}
.hero-card, .card-soft, .post-view, .profile-card, .messages-main, .messages-sidebar, .comment-card {
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}
.hero-card, .card-soft, .post-view, .profile-card, .messages-main, .messages-sidebar { padding: 20px; }
.posts-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.view-section { display: none; gap: 18px; }
.view-section.is-active { display: grid; }
.section-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.compact-head { margin-bottom: 12px; }
.messages-layout { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 18px; }
.profile-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 18px; }
.mobile-menu-btn, .mobile-backdrop { display: none; }