/* ───────────────────────────────────────────────────────────────
   Spaxel App Shell — Page-level CSS Grid (§8e Layout)
   Establishes one grid container per page. No absolute-positioned
   layout containers — overlays use <dialog> or fixed slide-ins.
   ─────────────────────────────────────────────────────────────── */

/* ── App shell grid ── */
.app-shell {
  display: grid;
  grid-template-areas:
    "header header"
    "nav    main"
    "footer footer";
  grid-template-columns: 260px 1fr;
  grid-template-rows: auto 1fr auto;
  min-height: 100dvh;
  max-width: 1440px;
  margin-inline: auto;
}

/* Named grid areas */
.app-shell > .app-header  { grid-area: header; }
.app-shell > .app-nav     { grid-area: nav; }
.app-shell > .app-main    { grid-area: main; }
.app-shell > .app-footer  { grid-area: footer; }

/* ── Full-width pages (no sidebar nav) ── */
.app-shell--full {
  grid-template-areas:
    "header"
    "main"
    "footer";
  grid-template-columns: 1fr;
}

/* ── Live-view shell (3D canvas fills viewport) ──
   Status bar = grid header (fixed height), scene = grid main.
   Overlay panels float over the canvas with position:fixed;
   they are NOT grid children. */
.app-shell--live {
  display: grid;
  grid-template-areas:
    "header"
    "main";
  grid-template-columns: 1fr;
  grid-template-rows: auto 1fr;
  min-height: 100dvh;
  max-width: none;
  margin-inline: 0;
}

.app-shell--live > .app-header {
  grid-area: header;
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-shell--live > .app-main {
  grid-area: main;
  position: relative;
  overflow: hidden;
  min-height: 0;
}

/* ── Tablet: collapse sidebar nav ── */
@media (max-width: 1023px) {
  .app-shell {
    grid-template-areas:
      "header"
      "main"
      "footer";
    grid-template-columns: 1fr;
  }

  .app-shell > .app-nav {
    display: none;
  }
}

/* ── Mobile: single column + bottom nav ── */
@media (max-width: 639px) {
  .app-shell,
  .app-shell--full,
  .app-shell--live {
    grid-template-areas:
      "header"
      "main";
    grid-template-columns: 1fr;
  }

  .app-shell > .app-nav,
  .app-shell > .app-footer {
    display: none;
  }

  /* Bottom navigation for mobile */
  .app-mobile-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--slate-3);
    border-top: 1px solid var(--border-default);
    padding-bottom: env(safe-area-inset-bottom);
    z-index: 100;
  }

  .app-mobile-nav__list {
    display: flex;
    list-style: none;
    width: 100%;
    margin: 0;
    padding: 0;
  }

  .app-mobile-nav__item {
    flex: 1;
    text-align: center;
  }

  .app-mobile-nav__link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: var(--space-2) 0;
    color: var(--text-muted);
    text-decoration: none;
    font-size: var(--text-xs);
    min-height: 44px;
    justify-content: center;
  }

  .app-mobile-nav__link--active {
    color: var(--color-primary);
  }
}

/* Desktop: hide mobile bottom nav */
@media (min-width: 640px) {
  .app-mobile-nav {
    display: none;
  }
}

/* ── Touch targets (all interactive elements) ── */
@media (max-width: 1023px) {
  .app-shell button,
  .app-shell--full button,
  .app-shell--live button,
  .app-shell a,
  .app-shell--full a,
  .app-shell--live a,
  .app-shell input[type="checkbox"],
  .app-shell--full input[type="checkbox"],
  .app-shell--live input[type="checkbox"],
  .app-shell select,
  .app-shell--full select,
  .app-shell--live select {
    min-height: 44px;
    min-width: 44px;
  }
}

/* ── Shared header styling ── */
.app-header {
  background: var(--slate-3);
  border-bottom: 1px solid var(--border-default);
  padding: 0 var(--space-6);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 100;
}

.app-header__logo {
  font-size: var(--text-lg);
  font-weight: var(--fw-heading);
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.app-header__links {
  display: flex;
  gap: var(--space-4);
}

.app-header__link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-control);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.app-header__link:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.app-header__link--active {
  color: var(--color-primary);
}

@media (max-width: 1023px) {
  .app-header__links {
    display: none;
  }
}

/* ── Shared sidebar nav ── */
.app-nav {
  background: var(--slate-2);
  border-right: 1px solid var(--border-default);
  padding: var(--space-4);
  overflow-y: auto;
}

/* ── Main content area ── */
.app-main {
  overflow-y: auto;
  overflow-x: hidden;
}

/* ── Live-view status bar (grid header in app-shell--live) ── */
.live-status-bar {
  background: var(--live-status-bg);
  height: 44px;
  display: flex;
  align-items: center;
  padding: 0 16px;
  padding-top: max(0px, env(safe-area-inset-top));
  gap: 24px;
  font-size: 14px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-default);
  flex-wrap: nowrap;
  overflow-x: auto;
  overflow-y: hidden;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
}

/* ── Live-view scene container (grid main in app-shell--live) ── */
.live-scene {
  width: 100%;
  height: 100%;
  touch-action: none;
}

/* ── Live-view overlay panels (float over canvas) ──
   These use position:fixed intentionally — they are transient
   overlays, NOT layout containers. The grid children are the
   status bar (header) and the canvas (main). */
.live-panel {
  background: var(--live-panel-bg);
  border-radius: 8px;
  z-index: 100;
  overflow-y: auto;
  color: var(--text-primary);
}

.live-panel--left {
  position: fixed;
  top: 60px;
  left: 20px;
  width: 280px;
  max-height: calc(100vh - 80px);
  padding: 12px;
}

.live-panel--right {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 400px;
  padding: 12px;
}

.live-panel--presence {
  position: fixed;
  top: 60px;
  right: 20px;
  width: 240px;
  max-height: calc(100vh - 80px);
  padding: 12px;
}

/* ── Tablet breakpoint for live panels ── */
@media (max-width: 1023px) {
  .live-panel--left,
  .live-panel--right,
  .live-panel--presence {
    display: none;
  }
}

/* ── Mobile bottom nav safe-area on live page ── */
@media (max-width: 639px) {
  .app-shell--live .live-status-bar {
    height: auto;
    min-height: 44px;
    padding: 8px 12px;
    flex-wrap: wrap;
    gap: 12px;
  }
}

/* ── Dialog-based modals (replaces fixed-position overlays) ── */
dialog.app-dialog {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-modal);
  padding: 0;
  max-width: 560px;
  width: 92%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px var(--shadow-xl);
}

dialog.app-dialog::backdrop {
  background: var(--overlay-strong);
  backdrop-filter: blur(2px);
}

/* ── Mobile body padding for bottom nav ── */
@media (max-width: 639px) {
  .has-mobile-nav {
    padding-bottom: calc(60px + env(safe-area-inset-bottom));
  }
}