/* App shell layout: collapsible nav rail + header + scrollable main
   column (the frame every app page renders inside — app_base.html).
   Nav state lives on <html data-nav="expanded"> so the pre-paint script
   can apply it before first render (no width jump). */

.app {
  display: flex;
  height: 100vh;
  width: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
}

/* The mobile-menu backdrop is display:none until the mobile block below
   overlays it — without this base rule it renders as a raw, unstyled
   <button> stretched to full viewport height: a white strip left of the
   rail on desktop. */
.app-scrim { display: none; border: none; padding: 0; background: none; }

/* ── Nav rail ─────────────────────────────────────────────────────── */
.app-nav {
  width: var(--nav-w);
  flex: none;
  display: flex;
  flex-direction: column;
  padding: 0 0 10px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow: hidden;
  transition: width .18s ease;
}
[data-nav="expanded"] .app-nav { width: var(--nav-w-expanded); }

.nav-brand {
  display: flex;
  align-items: center;
  /* Match the top-bar height and top-align so the logo's vertical
     centre lands on the header title's centre (both at --header-h / 2). */
  height: var(--header-h);
  margin-bottom: 6px;
  color: inherit;
}
.nav-brand-logo {
  width: 64px;
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
}
.nav-brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
}
.nav-brand-name {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -.01em;
  white-space: nowrap;
}

.nav-item {
  display: flex;
  align-items: center;
  height: 44px;
  margin: 1px 8px;
  border: none;
  border-radius: 10px;
  padding: 0;
  width: calc(100% - 16px);
  background: transparent;
  color: var(--text-2);
  text-decoration: none;
  cursor: pointer;
  text-align: left;
}
.nav-item:hover {
  background: var(--surface-2);
  color: var(--text);
}
.nav-item.is-active {
  color: var(--accent-text);
  background: var(--accent-soft);
}
.nav-item.is-active:hover { color: var(--accent-text); }
/* The label is text (4.5:1); the icon is an SVG stroke, which is non-text UI
   at 3:1. Holding the icon to the text rung only makes it needlessly dark. */
.nav-item.is-active .nav-item-icon { color: var(--accent-line); }
.nav-item-icon {
  width: 48px;
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
}
.nav-item-label {
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
}
.nav-item.is-active .nav-item-label { font-weight: 600; }

.nav-toggle { height: 40px; margin-bottom: 6px; }

.nav-spacer { flex: 1; }

/* Collapsed rail: labels (and the brand name) disappear; icons keep
   their titles for tooltips. */
.nav-item-label,
.nav-brand-name,
.nav-user-meta { display: none; }
[data-nav="expanded"] .nav-item-label,
[data-nav="expanded"] .nav-brand-name,
[data-nav="expanded"] .nav-user-meta { display: block; }

/* Theme toggle shows the icon for the mode you would switch TO. */
.theme-icon-sun { display: none; }
[data-theme="dark"] .theme-icon-sun { display: block; }
[data-theme="dark"] .theme-icon-moon { display: none; }
/* Collapse toggle: chevron when expanded, burger when collapsed. */
.nav-icon-collapse { display: none; }
[data-nav="expanded"] .nav-icon-collapse { display: block; }
[data-nav="expanded"] .nav-icon-burger { display: none; }

.nav-user {
  display: flex;
  align-items: center;
  height: 52px;
}
.nav-user-avatar-cell {
  width: 64px;
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
}
.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--surface-3);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-2);
}
.avatar-sm {
  width: 22px;
  height: 22px;
  font-size: 9px;
}
.nav-user-meta { min-width: 0; }
.nav-user-name {
  font-size: 12.5px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
/* ── Main column ──────────────────────────────────────────────────── */
.app-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.app-header {
  flex: none;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 var(--pad);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.app-header-crumbs {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
}
.app-header-title {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.crumb {
  font-size: 12px;
  color: var(--text-3);
  white-space: nowrap;
}
a.crumb:hover { color: var(--text); }
.crumb-sep { color: var(--border-2); }
.app-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: none;
}

.app-content {
  flex: 1;
  min-width: 0;
  overflow-y: auto;
  padding: var(--pad);
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}
.app-content > * { flex: none; }

/* Narrow content pages (forms, auth) center a single column. */
.content-narrow {
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
}

/* ── Mobile ───────────────────────────────────────────────────────── */
.mobile-nav-toggle { display: none; }

@media (max-width: 760px) {
  :root { --pad: 14px; --gap: 12px; }

  /* The rail overlays instead of squeezing the content. */
  .app-nav {
    position: fixed;
    z-index: 40;
    top: 0;
    bottom: 0;
    left: 0;
    width: var(--nav-w-expanded);
    transform: translateX(-100%);
    transition: transform .18s ease;
    box-shadow: var(--shadow);
  }
  [data-nav-open] .app-nav { transform: translateX(0); }
  /* Overlay rail is always the expanded variant. */
  .nav-item-label, .nav-brand-name, .nav-user-meta { display: block; }
  .nav-icon-collapse { display: block; }
  .nav-icon-burger { display: none; }
  .nav-toggle { display: none; }

  .mobile-nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    flex: none;
    border: 1px solid var(--border);
    border-radius: 9px;
    background: var(--surface);
    color: var(--text-2);
    cursor: pointer;
  }

  .app-scrim {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 30;
    background: rgba(20, 15, 8, .45);
    border: none;
    padding: 0;
  }
  [data-nav-open] .app-scrim { display: block; }
}