/* System Design Primer — extras for MkDocs Material
   Theme-aware bookmark widget + small tweaks. Works in light + dark palettes. */

/* ---------- Per-page bookmark toggle (rendered inside the H1) ---------- */
.sdp-bookmark-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  margin-left: 0.75rem;
  padding: 0.25em 0.65em;
  font-size: 0.7rem;
  font-weight: 500;
  line-height: 1.4;
  vertical-align: middle;
  cursor: pointer;
  background: transparent;
  color: var(--md-default-fg-color--light);
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.4em;
  transition: background 120ms, color 120ms, border-color 120ms;
}
.sdp-bookmark-btn:hover {
  background: var(--md-default-fg-color--lightest);
  color: var(--md-default-fg-color);
}
.sdp-bookmark-btn[data-on="true"] {
  background: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
  border-color: var(--md-primary-fg-color);
}
.sdp-bookmark-btn[data-on="true"]:hover {
  filter: brightness(1.05);
}

/* ---------- Floating panel ---------- */
.sdp-bm {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 80;
  font-family: var(--md-text-font-family);
}
.sdp-bm__toggle {
  position: relative;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  border: 0;
  background: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.18);
  cursor: pointer;
  font-size: 1.15rem;
  display: grid;
  place-items: center;
  transition: transform 120ms, box-shadow 120ms;
}
.sdp-bm__toggle:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.22);
}
.sdp-bm__count {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 1.2rem;
  height: 1.2rem;
  padding: 0 0.35rem;
  border-radius: 0.6rem;
  background: var(--md-accent-fg-color);
  color: var(--md-accent-bg-color);
  font-size: 0.65rem;
  font-weight: 700;
  line-height: 1.2rem;
  text-align: center;
  border: 2px solid var(--md-default-bg-color);
}
.sdp-bm__count[data-empty="true"] {
  display: none;
}

.sdp-bm__panel {
  position: absolute;
  right: 0;
  bottom: 3.6rem;
  width: min(360px, calc(100vw - 2rem));
  max-height: min(60vh, 480px);
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.6rem;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.18);
  overflow: hidden;
  display: none;
  flex-direction: column;
}
.sdp-bm[data-open="true"] .sdp-bm__panel {
  display: flex;
}
.sdp-bm__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--md-default-fg-color--lightest);
}
.sdp-bm__header-title {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}
.sdp-bm__header-title small {
  font-weight: 400;
  color: var(--md-default-fg-color--light);
}
.sdp-bm__actions {
  display: flex;
  gap: 0.3rem;
}
.sdp-bm__btn {
  background: transparent;
  border: 1px solid var(--md-default-fg-color--lighter);
  color: inherit;
  border-radius: 0.3rem;
  padding: 0.2rem 0.55rem;
  font-size: 0.65rem;
  cursor: pointer;
}
.sdp-bm__btn:hover {
  background: var(--md-default-fg-color--lightest);
}
.sdp-bm__list {
  margin: 0;
  padding: 0.25rem 0;
  list-style: none;
  overflow-y: auto;
  flex: 1;
}
.sdp-bm__item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
}
.sdp-bm__item:last-child { border-bottom: 0; }
.sdp-bm__item a {
  flex: 1;
  color: var(--md-default-fg-color);
  text-decoration: none;
  font-size: 0.82rem;
  line-height: 1.3;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sdp-bm__item a:hover {
  color: var(--md-primary-fg-color);
}
.sdp-bm__item small {
  color: var(--md-default-fg-color--light);
  font-size: 0.65rem;
  margin-right: 0.3rem;
}
.sdp-bm__remove {
  background: transparent;
  border: 0;
  color: var(--md-default-fg-color--light);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  padding: 0 0.2rem;
}
.sdp-bm__remove:hover { color: var(--md-default-fg-color); }
.sdp-bm__empty {
  padding: 1.25rem 1rem;
  text-align: center;
  color: var(--md-default-fg-color--light);
  font-size: 0.8rem;
}
.sdp-bm__footer {
  padding: 0.45rem 0.85rem;
  border-top: 1px solid var(--md-default-fg-color--lightest);
  background: var(--md-default-fg-color--lightest);
  font-size: 0.7rem;
  color: var(--md-default-fg-color--light);
  text-align: center;
}

/* ---------- Bookmarks page (full list rendered into [data-sdp-bm-page]) ---------- */
.sdp-bm-page__empty {
  padding: 2rem 1rem;
  text-align: center;
  color: var(--md-default-fg-color--light);
  border: 1px dashed var(--md-default-fg-color--lightest);
  border-radius: 0.4rem;
}
.sdp-bm-page__list {
  list-style: none;
  padding-left: 0;
}
.sdp-bm-page__list li {
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--md-default-fg-color--lightest);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.sdp-bm-page__list li:last-child { border-bottom: 0; }
.sdp-bm-page__list a { flex: 1; }
.sdp-bm-page__list small {
  color: var(--md-default-fg-color--light);
  font-size: 0.72rem;
}
.sdp-bm-page__remove {
  background: transparent;
  border: 1px solid var(--md-default-fg-color--lighter);
  border-radius: 0.3rem;
  padding: 0.25rem 0.55rem;
  font-size: 0.7rem;
  cursor: pointer;
  color: inherit;
}
.sdp-bm-page__remove:hover {
  background: var(--md-default-fg-color--lightest);
}

/* Don't show the floating widget on print */
@media print {
  .sdp-bm, .sdp-bookmark-btn { display: none !important; }
}

/* Mermaid container tweaks — let diagrams breathe and centre */
.md-typeset .mermaid { text-align: center; }
.md-typeset .mermaid svg { max-width: 100%; height: auto; }

/* ---------- Diagram zoom modal ----------------------------------------- */

/* Hint that a diagram is clickable */
.sdp-zoom-target {
  cursor: zoom-in;
  transition: filter 120ms;
}
.sdp-zoom-target:hover {
  filter: brightness(1.02) drop-shadow(0 1px 4px rgba(0,0,0,0.12));
}

/* Lock the page behind the modal */
body.sdp-zoom--lock { overflow: hidden; }

.sdp-zoom {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: stretch;
  justify-content: stretch;
}
.sdp-zoom.sdp-zoom--open { display: block; }

.sdp-zoom__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.78);
  backdrop-filter: blur(2px);
}
[data-md-color-scheme="slate"] .sdp-zoom__backdrop {
  background: rgba(0, 0, 0, 0.86);
}

.sdp-zoom__stage {
  position: absolute;
  inset: 0;
  overflow: hidden;
  cursor: grab;
}
.sdp-zoom--dragging .sdp-zoom__stage { cursor: grabbing; }

.sdp-zoom__pan {
  position: absolute;
  top: 0;
  left: 0;
  transform-origin: 0 0;
  will-change: transform;
}
.sdp-zoom__pan > svg,
.sdp-zoom__pan > img {
  display: block;
  background: transparent;
  user-select: none;
  -webkit-user-drag: none;
}

/* Toolbar is always a high-contrast white pill so it's visible against
   the dark backdrop on both light and dark page themes. */
.sdp-zoom__toolbar {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: flex;
  gap: 0.35rem;
  background: #ffffff;
  color: #0f172a;
  border: 1px solid rgba(15, 23, 42, 0.12);
  border-radius: 0.6rem;
  padding: 0.3rem;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.4);
  z-index: 10;
}
.sdp-zoom__btn {
  min-width: 2.25rem;
  height: 2.25rem;
  padding: 0 0.55rem;
  border: 1px solid transparent;
  border-radius: 0.4rem;
  background: transparent;
  color: #0f172a;
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: background 120ms, color 120ms, border-color 120ms;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.sdp-zoom__btn:hover {
  background: rgba(15, 23, 42, 0.08);
  border-color: rgba(15, 23, 42, 0.12);
}
.sdp-zoom__btn--fs {
  color: #ffffff;
  background: #4338ca;
  border-color: #4338ca;
}
.sdp-zoom__btn--fs:hover {
  filter: brightness(1.08);
  background: #4338ca;
}
.sdp-zoom__btn--close {
  color: #ffffff;
  background: #ef4444;
  border-color: #ef4444;
}
.sdp-zoom__btn--close:hover {
  background: #dc2626;
  border-color: #dc2626;
}

.sdp-zoom__hint {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255, 255, 255, 0.96);
  color: #0f172a;
  padding: 0.45rem 0.9rem;
  border-radius: 1rem;
  font-size: 0.72rem;
  font-weight: 500;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.32);
  pointer-events: none;
  z-index: 10;
  white-space: nowrap;
  max-width: calc(100vw - 2rem);
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (max-width: 540px) {
  .sdp-zoom__hint { font-size: 0.65rem; padding: 0.3rem 0.6rem; }
  .sdp-zoom__btn { min-width: 1.9rem; height: 1.9rem; font-size: 1rem; }
}

/* Disable on print */
@media print {
  .sdp-zoom { display: none !important; }
  .sdp-zoom-target { cursor: default; }
}

/* ---------- Per-diagram toolbar (Open / Fullscreen / Copy) ------------- */

.sdp-mermaid-host {
  position: relative;
}
.sdp-mtb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  justify-content: flex-end;
  padding: 0.25rem 0;
  margin-bottom: 0.25rem;
  background: transparent;
  position: relative;
  z-index: 2;
}
.sdp-mtb__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.4rem;
  background: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  font-size: 0.72rem;
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  transition: background 120ms, color 120ms, border-color 120ms, transform 120ms;
}
.sdp-mtb__btn:hover {
  background: var(--md-default-fg-color--lightest);
  border-color: var(--md-default-fg-color--lighter);
}
.sdp-mtb__btn:active {
  transform: translateY(1px);
}
.sdp-mtb__btn--flash {
  background: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
  border-color: var(--md-primary-fg-color);
}

/* Native fullscreen: when the diagram element enters browser fullscreen
   it becomes its own viewport. Make the SVG fill the space. */
.sdp-mermaid-host.sdp-fullscreen-host,
.sdp-mermaid-host:fullscreen,
.sdp-mermaid-host:-webkit-full-screen {
  background: var(--md-default-bg-color);
  padding: 2rem;
  display: flex;
  flex-direction: column;
}
.sdp-mermaid-host:fullscreen .sdp-mtb,
.sdp-mermaid-host:-webkit-full-screen .sdp-mtb {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(255, 255, 255, 0.96);
  border-radius: 0.5rem;
  padding: 0.3rem;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}
.sdp-mermaid-host:fullscreen svg,
.sdp-mermaid-host:-webkit-full-screen svg {
  flex: 1;
  width: 100%;
  height: 100%;
  max-width: none;
  max-height: none;
}

@media (max-width: 540px) {
  .sdp-mtb__btn { font-size: 0.65rem; padding: 0.25rem 0.55rem; }
}

@media print {
  .sdp-mtb { display: none !important; }
}

/* ---------- Header bookmark icon ---------------------------------------- */
.sdp-header-bm {
  position: relative;
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  margin: 0 0.1rem;
}
.sdp-header-bm svg {
  width: 1.2rem;
  height: 1.2rem;
}
.sdp-header-bm__count {
  position: absolute;
  top: 0.2rem;
  right: 0.05rem;
  min-width: 0.95rem;
  height: 0.95rem;
  padding: 0 0.25rem;
  border-radius: 0.5rem;
  background: var(--md-accent-fg-color, #ef4444);
  color: var(--md-accent-bg-color, #ffffff);
  font-size: 0.55rem;
  font-weight: 700;
  line-height: 0.95rem;
  text-align: center;
  border: 1.5px solid var(--md-primary-fg-color);
  pointer-events: none;
}
.sdp-header-bm__count[data-empty="true"] {
  display: none;
}

/* ---------- Top tier tabs: scroll affordance --------------------------- */
.sdp-tabs {
  position: relative;
}
.sdp-tabs .md-tabs__list {
  -ms-overflow-style: none;
  scrollbar-width: none;
  scroll-behavior: smooth;
}
.sdp-tabs .md-tabs__list::-webkit-scrollbar { display: none; }

/* edge fades only when there's overflow + we're not at the corresponding edge */
.sdp-tabs::before,
.sdp-tabs::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2.5rem;
  pointer-events: none;
  opacity: 0;
  transition: opacity 200ms ease;
  z-index: 5;
}
.sdp-tabs::before {
  left: 0;
  background: linear-gradient(to right, var(--md-primary-fg-color), rgba(0,0,0,0));
}
.sdp-tabs::after {
  right: 0;
  background: linear-gradient(to left, var(--md-primary-fg-color), rgba(0,0,0,0));
}
.sdp-tabs--overflow:not(.sdp-tabs--at-start)::before { opacity: 1; }
.sdp-tabs--overflow:not(.sdp-tabs--at-end)::after    { opacity: 1; }

/* "scroll →" hint button on the right */
.sdp-tabs__hint {
  position: absolute;
  top: 50%;
  right: 0.6rem;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.92);
  color: var(--md-primary-fg-color);
  border: 0;
  border-radius: 1rem;
  padding: 0.25rem 0.7rem;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  display: none;
  z-index: 6;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  animation: sdpNavHintPulse 1.6s ease-in-out 2 1s both;
}
.sdp-tabs--overflow:not(.sdp-tabs--at-end):not(.sdp-tabs--seen) .sdp-tabs__hint {
  display: block;
}
@keyframes sdpNavHintPulse {
  0%, 100% { transform: translateY(-50%) translateX(0); opacity: 0.95; }
  50%      { transform: translateY(-50%) translateX(4px); opacity: 1; }
}

@media print {
  .sdp-header-bm, .sdp-tabs__hint, .sdp-tabs::before, .sdp-tabs::after { display: none !important; }
}