/* ============================================================
   Tendi NAV reskin: icon RAIL + sliding SUB-PANE.
   Replaces the single labeled sidebar with the grouped two-column nav from
   docs/reskin/mockups/dashboard-redesign.html: an 88px violet icon rail (one
   item per section group) + a lifted white sub-pane that slides out with the
   open group's pages.

   Loaded globally from inc/head.php, AFTER tendi-shell.css so it overrides the
   shell agent's labeled-sidebar rules. Visual language = the project tokens
   (cool lavender + violet, Inter / Plus Jakarta), NOT the mockup's warm cream.
   Markup: application/views/admin/common/template.php (#sidebar-left.tnd-rail-shell).
   Behaviour: assets/admin/js/tendi-nav.js.
   ============================================================ */

/* Repurpose the shell rail width var (the shell uses it for #logo / #top-panel /
   #content / #sidebar-left math) so the whole chrome reflows to an 88px rail
   with one variable, then the sub-pane width drives the open-state content push. */
:root {
  --shell-rail-w: 88px;       /* was 232px (labeled sidebar) */
  --tnd-subpane-w: 232px;
}

/* ------------------------------------------------------------
   1. RAIL SHELL: the 88px column that holds the rail + (fixed) sub-pane
   ------------------------------------------------------------ */
#sidebar-left.tnd-rail-shell {
  /* kill the legacy faux-column padding (style.css padding-bottom:3000px) so the
     rail doesn't get a giant empty scroll region */
  padding: 0 !important;
  margin-bottom: 0 !important;
}

@media (min-width: 768px) {
  /* FIXED rail: pinned under the 56px topbar, never scrolls with the page and
     has no inner scrollbar (the 9 group items fit). The fixed sub-pane is a
     child but is positioned to the viewport, so overflow:hidden never clips it. */
  #sidebar-left.tnd-rail-shell {
    position: fixed !important;
    top: 56px;
    left: 0;
    width: var(--shell-rail-w) !important;
    height: calc(100vh - 56px) !important;
    overflow: hidden !important;
  }
}

/* ------------------------------------------------------------
   2. ICON RAIL: vertical stack of group items on the violet gradient
   (the gradient fill comes from tendi-shell.css #sidebar-left)
   ------------------------------------------------------------ */
.tnd-rail {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
  padding: 14px 10px 18px;
}

.tnd-rail-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 10px 4px 8px;
  border-radius: var(--radius-lg);
  color: rgba(255, 255, 255, 0.80);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.tnd-rail-item > i {
  font-size: 18px;
  line-height: 1;
  width: 20px;
  text-align: center;
}

.tnd-rail-label {
  font-family: var(--font-sans);
  font-size: 8.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  line-height: 1;
  text-align: center;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tnd-rail-item:hover,
.tnd-rail-item:focus {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  outline: none;
}

/* a group whose sub-pane is currently OPEN but isn't the active page */
.tnd-rail-item.open {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
}

/* the group of the CURRENT page: frosted pill + left tick */
.tnd-rail-item.active {
  background: rgba(255, 255, 255, 0.22);
  color: #ffffff;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.10);
}

.tnd-rail-item.active::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 22px;
  background: #ffffff;
  border-radius: 0 3px 3px 0;
}

/* ------------------------------------------------------------
   3. SUB-PANE: lifted white panel, fixed below the 56px topbar, slides from
   behind the rail. Overlays the canvas; content is pushed via body.tnd-pane-open.
   ------------------------------------------------------------ */
.tnd-subpane {
  position: fixed;
  top: 56px;
  left: var(--shell-rail-w);
  bottom: 0;
  width: var(--tnd-subpane-w);
  z-index: 28;                          /* above #content (z:10), below modals */
  display: flex;
  flex-direction: column;
  /* soft lavender wash: a notch darker than the --cream content canvas, far
     lighter than the violet rail. Derived from the theme --primary so it tracks
     re-themes automatically (fallback --cream-2 for no color-mix support). */
  background: var(--cream-2);
  background: color-mix(in srgb, var(--primary) 7%, var(--cream));
  border-right: 1px solid var(--shell-hairline, #ebe4f3);
  box-shadow: var(--shadow-overlay);
  transform: translateX(-104%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.28s cubic-bezier(0.32, 0.72, 0.18, 1), opacity 0.20s ease;
}

.tnd-subpane[data-open="true"] {
  transform: none;
  opacity: 1;
  pointer-events: auto;
}

.tnd-subpane-head {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 18px 14px;
  border-bottom: 1px solid var(--shell-hairline, #ebe4f3);
}

.tnd-subpane-eyebrow {
  font-family: var(--font-sans);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--ink-4);
  margin-bottom: 5px;
}

.tnd-subpane-head h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.tnd-subpane-collapse {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  /* resting tint = the old hover bg; hover now steps a bit darker */
  background: color-mix(in srgb, var(--primary) 13%, var(--cream));
  color: var(--ink-4);
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.tnd-subpane-collapse:hover {
  background: color-mix(in srgb, var(--primary) 20%, var(--cream));
  color: var(--ink);
}

.tnd-subpane-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
}

.tnd-subnav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.tnd-subnav[hidden] {
  display: none;
}

.tnd-sub-item {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 9px 12px;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: -0.005em;
  color: var(--ink-2);
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}

/* hover + active sit ON the tinted pane, so their steps are raised to stay
   readable against it: all kept on the --primary ramp so they re-theme too */
.tnd-sub-item:hover,
.tnd-sub-item:focus {
  background: color-mix(in srgb, var(--primary) 13%, var(--cream));
  color: var(--ink);
  outline: none;
}

.tnd-sub-item.active {
  background: color-mix(in srgb, var(--primary) 18%, var(--cream));
  color: var(--primary);
  font-weight: 600;
}

.tnd-sub-bullet {
  flex-shrink: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--ink-5);
  transition: background 0.15s ease, transform 0.15s ease;
}

.tnd-sub-item:hover .tnd-sub-bullet,
.tnd-sub-item.active .tnd-sub-bullet {
  background: var(--primary);
  transform: scale(1.4);
}

.tnd-sub-text {
  overflow: hidden;
  text-overflow: ellipsis;
}

/* never underline nav links (legacy a:hover/active text-decoration leaks in) */
.tnd-rail-item,
.tnd-rail-item:hover,
.tnd-rail-item:focus,
.tnd-rail-item:active,
.tnd-sub-item,
.tnd-sub-item:hover,
.tnd-sub-item:focus,
.tnd-sub-item:active,
.tnd-sub-item.active {
  text-decoration: none !important;
}

/* sub-pane scrollbar: thin lavender (matches the shell flyouts) */
.tnd-subpane-scroll::-webkit-scrollbar { width: 8px; }
.tnd-subpane-scroll::-webkit-scrollbar-track { background: transparent; }
.tnd-subpane-scroll::-webkit-scrollbar-thumb {
  background: var(--cream-3);
  border-radius: var(--radius-full);
}

/* ------------------------------------------------------------
   4. CONTENT OFFSET: push the page right while the sub-pane is open
   ------------------------------------------------------------ */
@media (min-width: 768px) {
  /* the rail is position:fixed (out of flow) so content must clear it with a
     left margin; opening the sub-pane widens that margin by the sub-pane width */
  #content {
    margin-left: var(--shell-rail-w) !important;
    transition: width 0.26s ease, margin-left 0.26s ease;
  }
  body.tnd-pane-open #content {
    width: calc(100% - var(--shell-rail-w) - var(--tnd-subpane-w)) !important;
    margin-left: calc(var(--shell-rail-w) + var(--tnd-subpane-w)) !important;
  }
  /* (logo cell is an org monogram now, styled in tendi-header.css) */
}

/* ------------------------------------------------------------
   5. MOBILE (<768px). The rail keeps the legacy reveal model; the sub-pane
   overlays full-bleed-ish so it stays usable without the desktop push math.
   ------------------------------------------------------------ */
@media (max-width: 767px) {
  .tnd-subpane {
    top: 112px;                         /* legacy stacks logo + panel on mobile */
    left: 88px;
    width: calc(100vw - 88px);
    max-width: 320px;
  }
  .tnd-rail-label { font-size: 8px; }
}