/* ==========================================================
   Layout: app shell, sidebar, top bar, main, footer
   ========================================================== */

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
}

/* ---------- Sidebar ---------- */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 40;
  color: var(--side-text);
  background: var(--sidebar-bg);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-right: 1px solid var(--side-line);
}

.sidebar__scroll {
  height: 100%;
  overflow-y: auto;
  padding: var(--space-5) var(--space-4) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.sidebar__scroll > * {
  flex-shrink: 0;
}

.sidebar__foot {
  margin-top: auto;
  padding-top: var(--space-4);
  border-top: 1px solid var(--side-line);
  display: grid;
  gap: var(--space-3);
}

.sidebar__copy {
  font-size: var(--fs-xs);
  color: var(--side-text-2);
  line-height: 1.5;
}

.scrim {
  display: none;
}

/* ---------- Main column ---------- */
.main-col {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: 0 clamp(var(--space-4), 3vw, var(--space-6));
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid var(--line);
}

.topbar .topbar__menu,
.topbar .topbar__logo {
  display: none;
}

.topbar__crumb {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-lg);
  white-space: nowrap;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

main {
  flex: 1;
  outline: none;
  padding: clamp(var(--space-4), 3vw, var(--space-6));
  padding-bottom: var(--space-7);
}

.view {
  max-width: 1320px;
  margin: 0 auto;
  display: grid;
  gap: var(--space-5);
}

.view.view-enter {
  animation: view-in var(--dur-slow) var(--ease-out) both;
}

@keyframes view-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
}

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 260ms;
}

.site-foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-4) clamp(var(--space-4), 3vw, var(--space-6));
  border-top: 1px solid var(--line);
  color: var(--text-3);
  font-size: var(--fs-sm);
}

.site-foot a:hover {
  color: var(--text);
}

.noscript {
  padding: var(--space-5);
  text-align: center;
}

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .topbar .topbar__cta {
    display: none;
  }
}

@media (max-width: 960px) {
  .app {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(var(--sidebar-w), 86vw);
    transform: translateX(-102%);
    transition: transform var(--dur-med) var(--ease-out);
    background: color-mix(in srgb, var(--navy-950) 96%, transparent);
  }

  .drawer-open .sidebar {
    transform: none;
    box-shadow: var(--shadow-2);
  }

  .scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 35;
    background: rgba(5, 6, 10, 0.55);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-med) var(--ease-out);
  }

  .drawer-open .scrim {
    opacity: 1;
    pointer-events: auto;
  }

  .topbar .topbar__menu,
  .topbar .topbar__logo {
    display: inline-grid;
  }

  .topbar__logo {
    width: 32px;
    height: 32px;
  }
}

@media (max-width: 640px) {
  :root {
    --header-h: 60px;
  }

  .topbar {
    gap: var(--space-2);
  }

  .topbar__crumb,
  .search__kbd {
    display: none;
  }

  .search input {
    padding-right: 0.8rem;
  }

  .site-foot {
    flex-direction: column;
  }
}