/*
 * Pahadi Pathshala — shared long-article sidebar shell
 * ---------------------------------------------------
 * Optional navigation chrome for long study articles. This file owns only:
 * - desktop article/sidebar geometry;
 * - the standard brand card;
 * - All / Bookmarks / To Do tabs;
 * - in-page TOC rows and active/done/bookmarked states;
 * - the mobile off-canvas sidebar transition.
 *
 * Subjects own sidebar CONTENT (for example Forest Part navigation) and their
 * <main> study presentation. Topbar, footer, theme and sidebar open/close
 * behavior remain owned by the root shared-study controller.
 */

.shared-study-sidebar-page {
  --study-sidebar-card: var(--card, var(--shared-chrome-surface, #fff));
  --study-sidebar-bg: var(--paper-2, var(--shared-chrome-sidebar, #e9efea));
  --study-sidebar-text: var(--ink, var(--shared-chrome-text, #18231e));
  --study-sidebar-muted: var(--ink-soft, var(--shared-chrome-muted, #5d6b63));
  --study-sidebar-faint: var(--ink-faint, var(--shared-chrome-faint, #748279));
  --study-sidebar-line: var(--line, var(--shared-chrome-border, #ced8d1));
  --study-sidebar-line-soft: var(--line-soft, var(--shared-chrome-border, #d8e0db));
  --study-sidebar-accent: var(--accent, var(--shared-chrome-accent, #266b52));
  --study-sidebar-accent-strong: var(--accent-2, var(--shared-chrome-accent-strong, #174b3a));
  --study-sidebar-accent-soft: var(--accent-soft, var(--shared-chrome-accent-soft, rgba(38, 107, 82, .10)));
  --study-sidebar-success: var(--success, var(--study-sidebar-accent));
  padding-top: var(--shared-topbar-height, 64px);
}

.shared-study-sidebar-page .study-sidebar-layout {
  display: grid;
  grid-template-columns: 286px minmax(0, 1fr);
  min-height: calc(100vh - var(--shared-topbar-height, 64px));
}

.shared-study-sidebar-page .study-sidebar-layout > main {
  grid-column: 2;
  min-width: 0;
  margin-left: 0;
}

.shared-study-sidebar-page .study-sidebar {
  box-sizing: border-box;
  position: sticky;
  top: var(--shared-topbar-height, 64px);
  align-self: start;
  width: auto;
  height: calc(100vh - var(--shared-topbar-height, 64px));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 18px 14px 24px;
  border-right: 1px solid var(--study-sidebar-line);
  background: color-mix(in srgb, var(--study-sidebar-bg) 90%, var(--study-sidebar-card));
  scrollbar-width: thin;
}

.shared-study-sidebar-page .study-sidebar::-webkit-scrollbar { width: 8px; }
.shared-study-sidebar-page .study-sidebar::-webkit-scrollbar-thumb {
  border-radius: 8px;
  background: var(--study-sidebar-line);
}

.shared-study-sidebar-page .study-sidebar-brand {
  margin-bottom: 12px;
  padding: 15px 15px 14px;
  border: 1px solid var(--study-sidebar-line);
  border-radius: 15px;
  background: linear-gradient(
    145deg,
    var(--study-sidebar-card),
    color-mix(in srgb, var(--study-sidebar-accent) 4%, var(--study-sidebar-card))
  );
  box-shadow: none;
}

.shared-study-sidebar-page .study-sidebar-brand::before {
  content: "";
  display: block;
  width: 34px;
  height: 4px;
  margin-bottom: 11px;
  border-radius: 999px;
  background: var(--study-sidebar-accent);
}

.shared-study-sidebar-page .study-sidebar-brand strong {
  display: block;
  color: var(--study-sidebar-text);
  font-size: 17px;
  line-height: 1.25;
}

.shared-study-sidebar-page .study-sidebar-brand span {
  display: block;
  margin-top: 5px;
  color: var(--study-sidebar-faint);
  font-size: 11.5px;
  line-height: 1.55;
}

.shared-study-sidebar-page .toc-toolbar {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 3px;
  margin: 10px 0 14px;
  padding: 4px;
  border: 1px solid var(--study-sidebar-line-soft);
  border-radius: 12px;
  background: var(--study-sidebar-card);
}

.shared-study-sidebar-page .toc-tab {
  min-width: 0;
  min-height: 34px;
  padding: 7px 4px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--study-sidebar-muted);
  font: inherit;
  font-size: 11px;
  font-weight: 800;
  white-space: nowrap;
  cursor: pointer;
}

.shared-study-sidebar-page .toc-tab:hover,
.shared-study-sidebar-page .toc-tab:focus-visible {
  color: var(--study-sidebar-text);
  background: var(--study-sidebar-accent-soft);
}

.shared-study-sidebar-page .toc-tab.active {
  color: #fff;
  background: var(--study-sidebar-accent);
  box-shadow: 0 3px 10px color-mix(in srgb, var(--study-sidebar-accent) 18%, transparent);
}

.shared-study-sidebar-page .toc-tab .badge {
  margin-left: 3px;
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 10px;
}

.shared-study-sidebar-page .toc-label {
  margin: 18px 8px 8px;
  color: var(--study-sidebar-faint);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.shared-study-sidebar-page .toc-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.shared-study-sidebar-page .toc-link {
  position: relative;
  display: flex;
  gap: 8px;
  align-items: flex-start;
  min-width: 0;
  padding: 9px 10px 9px 12px;
  border: 1px solid transparent;
  border-radius: 9px;
  color: var(--study-sidebar-muted);
  text-decoration: none;
  font-size: 12.5px;
  font-weight: 700;
  line-height: 1.35;
}

.shared-study-sidebar-page .toc-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 3px;
  border-radius: 999px;
  background: transparent;
}

.shared-study-sidebar-page .toc-link:hover,
.shared-study-sidebar-page .toc-link:focus-visible,
.shared-study-sidebar-page .toc-link.active,
.shared-study-sidebar-page .toc-link[aria-current="location"] {
  border-color: var(--study-sidebar-line-soft);
  color: var(--study-sidebar-text);
  background: var(--study-sidebar-card);
}

.shared-study-sidebar-page .toc-link.active,
.shared-study-sidebar-page .toc-link[aria-current="location"] {
  box-shadow: 0 2px 8px rgba(0, 0, 0, .035);
}

.shared-study-sidebar-page .toc-link.active::before,
.shared-study-sidebar-page .toc-link[aria-current="location"]::before {
  background: var(--study-sidebar-accent);
}

.shared-study-sidebar-page .toc-link.done::after {
  content: "✓";
  margin-left: auto;
  color: var(--study-sidebar-success);
  font-weight: 900;
}

.shared-study-sidebar-page .toc-link.bookmarked {
  border-color: color-mix(in srgb, var(--study-sidebar-accent) 42%, var(--study-sidebar-line));
}

.shared-study-sidebar-page .toc-link .mono {
  flex: 0 0 auto;
  color: var(--study-sidebar-faint);
  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 10px;
  font-variant-numeric: tabular-nums;
}

.shared-study-sidebar-page > .skip-link {
  position: fixed;
  top: 8px;
  left: 12px;
  z-index: 1300;
  transform: translateY(-160%);
  padding: 8px 12px;
  border-radius: 8px;
  color: #fff;
  background: var(--study-sidebar-accent-strong);
  text-decoration: none;
  transition: transform .15s ease;
}

.shared-study-sidebar-page > .skip-link:focus { transform: translateY(0); }

@media (max-width: 900px) {
  .shared-study-sidebar-page .study-sidebar-layout { display: block; }

  .shared-study-sidebar-page .study-sidebar {
    position: fixed;
    left: 0;
    top: var(--shared-topbar-height, 60px);
    bottom: 0;
    z-index: 1150;
    width: min(320px, 86vw);
    height: calc(100vh - var(--shared-topbar-height, 60px));
    height: calc(100dvh - var(--shared-topbar-height, 60px));
    max-height: calc(100dvh - var(--shared-topbar-height, 60px));
    transform: translateX(-104%);
    transition: transform .24s ease;
    box-shadow: 10px 0 24px rgba(0, 0, 0, .12);
  }

  .shared-study-sidebar-page .study-sidebar.open,
  .shared-study-sidebar-page .study-sidebar.active { transform: translateX(0); }

  .shared-study-sidebar-page .study-sidebar-layout > main {
    grid-column: auto;
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .shared-study-sidebar-page .study-sidebar,
  .shared-study-sidebar-page > .skip-link { transition: none; }
}

@media print {
  .shared-study-sidebar-page { padding-top: 0; }
  .shared-study-sidebar-page .study-sidebar { display: none; }
  .shared-study-sidebar-page .study-sidebar-layout { display: block; }
  .shared-study-sidebar-page .study-sidebar-layout > main { margin-left: 0; }
}