/* ==========================================================================
   AG NOVA — 03 LAYOUT
   The OS shell: header strip, viewport, taskbar, and the panel grids.
   ========================================================================== */

.nova-shell {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--shell-pad);
  padding-bottom: 0;
}

/* --------------------------------------------------------------------------
   HEADER STRIP — status bar, not navigation
   -------------------------------------------------------------------------- */

.nova-header {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  min-height: var(--header-h);
  padding: 0 var(--sp-4);
  margin-bottom: var(--panel-gap);
  background: var(--nova-chassis);
  border: var(--border-structural) solid var(--nova-border);
  clip-path: polygon(
    0 0, calc(100% - var(--chamfer)) 0, 100% var(--chamfer),
    100% 100%, var(--chamfer) 100%, 0 calc(100% - var(--chamfer))
  );
}

.nova-header__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
}

.nova-header__mark {
  width: 26px;
  height: 26px;
  flex-shrink: 0;
}

.nova-header__titles {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.nova-header__os {
  font-family: var(--font-heading);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: var(--ls-wider);
  color: var(--nova-text-primary);
  text-transform: uppercase;
}

.nova-header__sub {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wider);
  color: var(--nova-text-diagnostic);
  text-transform: uppercase;
}

.nova-header__divider {
  width: var(--border-thin);
  align-self: stretch;
  margin: var(--sp-2) 0;
  background: var(--nova-grid);
  flex-shrink: 0;
}

.nova-header__telemetry {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  margin-left: auto;
  flex-wrap: wrap;
  justify-content: flex-end;
}

/* --------------------------------------------------------------------------
   MAIN VIEWPORT — the only region that swaps on navigation
   -------------------------------------------------------------------------- */

.nova-viewport {
  /* Named so cross-document view transitions animate this region alone,
     while the header and taskbar are held in place. */
  view-transition-name: nova-viewport;
}

.nova-page-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: 0 var(--sp-1) var(--sp-3);
  margin-bottom: var(--panel-gap);
  border-bottom: var(--border-thin) dashed var(--nova-grid);
  flex-wrap: wrap;
}

.nova-page-head__title {
  font-size: var(--fs-large);
  letter-spacing: var(--ls-wide);
}

.nova-page-head__desc {
  max-width: 62ch;
  margin-top: var(--sp-1);
  font-size: var(--fs-small);
  color: var(--nova-text-muted);
}

.nova-page-head__meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wider);
  color: var(--nova-text-diagnostic);
  text-transform: uppercase;
  text-align: right;
}

/* --------------------------------------------------------------------------
   PANEL GRIDS
   The rack. Gaps are deliberate empty chassis, not whitespace.
   -------------------------------------------------------------------------- */

.nova-grid {
  display: grid;
  gap: var(--panel-gap);
  grid-template-columns: repeat(12, 1fr);
}

/* THE BRIDGE — asymmetrical diagnostic layout.
   Desktop arrangement:
     row 1  expedition (5)   missions (7)
     row 2  signal (3)       report (5)     archive (4)
     row 3  captain log (12) */
.nova-grid--bridge > .nova-span-expedition { grid-column: span 5; }
.nova-grid--bridge > .nova-span-missions   { grid-column: span 7; }
.nova-grid--bridge > .nova-span-signal     { grid-column: span 3; }
.nova-grid--bridge > .nova-span-report     { grid-column: span 5; }
.nova-grid--bridge > .nova-span-archive    { grid-column: span 4; }
.nova-grid--bridge > .nova-span-log        { grid-column: span 12; }

/* Generic spans for other pages */
.nova-span-4  { grid-column: span 4; }
.nova-span-5  { grid-column: span 5; }
.nova-span-6  { grid-column: span 6; }
.nova-span-7  { grid-column: span 7; }
.nova-span-8  { grid-column: span 8; }
.nova-span-12 { grid-column: span 12; }

/* Two-column working layout: main content + sidebar of technical data */
.nova-split {
  display: grid;
  gap: var(--panel-gap);
  grid-template-columns: minmax(0, 1fr) 320px;
  align-items: start;
}

.nova-stack {
  display: flex;
  flex-direction: column;
  gap: var(--panel-gap);
}

/* --------------------------------------------------------------------------
   TASKBAR — the only navigation. Always on screen.
   -------------------------------------------------------------------------- */

.nova-taskbar {
  /* Named so the browser treats it as the same element across documents.
     This is what stops it from flashing or re-rendering on navigation. */
  view-transition-name: nova-taskbar;

  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 100;

  background: var(--nova-chassis);
  border-top: var(--border-heavy) solid var(--nova-border);
  padding: var(--sp-2) var(--sp-3);
  padding-bottom: calc(var(--sp-2) + env(safe-area-inset-bottom, 0px));
  box-shadow: 0 -14px 30px rgba(8, 17, 27, 0.72);
}

.nova-taskbar__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  display: flex;
  align-items: stretch;
  gap: var(--sp-2);
}

.nova-taskbar__keys {
  display: flex;
  align-items: stretch;
  gap: var(--sp-2);
  flex: 1;
  min-width: 0;
}

.nova-taskbar__status {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding-left: var(--sp-3);
  border-left: var(--border-thin) solid var(--nova-grid);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-wider);
  color: var(--nova-text-diagnostic);
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
}