.tdrn {
  --tdrn-border: color-mix(in srgb, currentColor 14%, transparent);
  --tdrn-border-strong: color-mix(in srgb, currentColor 24%, transparent);
  --tdrn-muted: color-mix(in srgb, currentColor 62%, transparent);
  --tdrn-bg: color-mix(in srgb, Canvas 92%, currentColor 8%);
  --tdrn-active-bg: color-mix(in srgb, currentColor 9%, transparent);
  --tdrn-shadow: 0 18px 50px rgb(0 0 0 / 0.06);
  --tdrn-radius: 18px;
  --tdrn-offset: 1rem;
  --tdrn-sticky-top: 96px;
  --tdrn-heading-offset: 104px;
  box-sizing: border-box;
  margin: 1.5rem 0;
  color: inherit;
  container-type: inline-size;
}

.tdrn *,
.tdrn *::before,
.tdrn *::after {
  box-sizing: border-box;
}

.tdrn--sticky {
  position: relative;
}

@media (min-width: 1100px) {
  .tdrn--sticky {
    position: sticky;
    top: var(--tdrn-sticky-top, 96px);
    z-index: 5;
    align-self: start;
  }

  .tdrn--sticky .tdrn__details {
    max-block-size: calc(100dvh - var(--tdrn-sticky-top, 96px) - 24px);
    display: flex;
    flex-direction: column;
  }

  .tdrn--sticky .tdrn__details[open] .tdrn__nav {
    overflow: auto;
    scrollbar-gutter: stable;
    overscroll-behavior: contain;
    max-block-size: calc(100dvh - var(--tdrn-sticky-top, 96px) - 96px);
  }

  .tdrn--sticky.is-stuck .tdrn__details {
    box-shadow: 0 22px 65px rgb(0 0 0 / 0.09);
  }
}

.tdrn__details {
  border: 1px solid var(--tdrn-border);
  border-radius: var(--tdrn-radius);
  background: var(--tdrn-bg);
  box-shadow: var(--tdrn-shadow);
  overflow: clip;
}

.tdrn--minimal .tdrn__details {
  border: 0;
  border-radius: 0;
  box-shadow: none;
  background: transparent;
}

.tdrn--rail .tdrn__details {
  border-inline-start: 3px solid currentColor;
  border-radius: 0 16px 16px 0;
}

.tdrn--timeline .tdrn__details {
  background: transparent;
  box-shadow: none;
  border: 0;
}

.tdrn__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  cursor: pointer;
  padding: 0.9rem 1rem;
  list-style: none;
  user-select: none;
}

.tdrn__summary::-webkit-details-marker {
  display: none;
}

.tdrn__summary::after {
  content: "";
  inline-size: .55rem;
  block-size: .55rem;
  border-inline-end: 2px solid currentColor;
  border-block-end: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform .18s ease;
  opacity: .7;
}

.tdrn__details[open] > .tdrn__summary::after {
  transform: rotate(225deg) translateY(-2px);
}

.tdrn__summary-main {
  display: grid;
  gap: .1rem;
  min-inline-size: 0;
}

.tdrn__title {
  font-weight: 750;
  letter-spacing: -0.01em;
}

.tdrn__meta,
.tdrn__reading-time {
  color: var(--tdrn-muted);
  font-size: .86em;
  line-height: 1.2;
}

.tdrn__reading-time {
  margin-inline-start: auto;
  white-space: nowrap;
}

.tdrn__nav {
  padding: 0 .65rem .9rem;
}

.tdrn__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.tdrn__list .tdrn__list {
  margin-block-start: .15rem;
  margin-inline-start: .85rem;
  padding-inline-start: .65rem;
  border-inline-start: 1px solid var(--tdrn-border);
}

.tdrn--numbered .tdrn__nav {
  counter-reset: tdrn-section;
}

.tdrn--numbered .tdrn__item {
  counter-increment: tdrn-section;
}

.tdrn--numbered .tdrn__link-text::before {
  content: counters(tdrn-section, ".") ". ";
  color: var(--tdrn-muted);
  font-variant-numeric: tabular-nums;
}

.tdrn__link {
  position: relative;
  display: grid;
  grid-template-columns: .55rem minmax(0, 1fr);
  align-items: start;
  gap: .45rem;
  border-radius: 12px;
  padding: .42rem .5rem;
  color: inherit;
  text-decoration: none;
  line-height: 1.3;
  transition: background-color .16s ease, color .16s ease, transform .16s ease;
}

.tdrn__marker {
  inline-size: .38rem;
  block-size: .38rem;
  border-radius: 999px;
  margin-block-start: .45em;
  background: var(--tdrn-border-strong);
  transition: transform .16s ease, background-color .16s ease;
}

.tdrn__link:hover,
.tdrn__link:focus-visible,
.tdrn__link.is-active {
  background: var(--tdrn-active-bg);
  text-decoration: none;
}

.tdrn__link.is-active {
  font-weight: 700;
}

.tdrn__link.is-active::before {
  content: "";
  position: absolute;
  inset-block: .4rem;
  inset-inline-start: .15rem;
  inline-size: 3px;
  border-radius: 999px;
  background: currentColor;
  opacity: .7;
}

.tdrn__link.is-active .tdrn__marker {
  background: currentColor;
  transform: scale(1.25);
}

.tdrn__link:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}

.tdrn--timeline .tdrn__list .tdrn__list,
.tdrn--timeline .tdrn__list {
  border-inline-start: 1px solid var(--tdrn-border);
  margin-inline-start: .25rem;
  padding-inline-start: .85rem;
}

.tdrn--timeline .tdrn__link {
  margin-inline-start: -.85rem;
}

.tdrn-heading {
  scroll-margin-top: var(--tdrn-heading-offset, 104px);
}

.tdrn-heading:focus {
  outline: 2px solid color-mix(in srgb, currentColor 40%, transparent);
  outline-offset: .25rem;
}

.tdrn-editor-placeholder {
  border: 1px dashed currentColor;
  border-radius: 14px;
  padding: 1rem;
  background: rgb(127 127 127 / .08);
}

@media (max-width: 720px) {
  .tdrn {
    margin: 1rem 0;
  }

  .tdrn__details:not([open]) {
    box-shadow: none;
  }

  .tdrn__summary {
    padding: .85rem .95rem;
  }

  .tdrn__nav {
    max-height: min(60vh, 420px);
    overflow: auto;
    overscroll-behavior: contain;
  }
}

@media (prefers-reduced-motion: reduce) {
  .tdrn__summary::after,
  .tdrn__link,
  .tdrn__marker {
    transition: none;
  }
}

.tdrn__progress {
  display: block;
  inline-size: 100%;
  block-size: 3px;
  background: var(--tdrn-border);
  overflow: hidden;
}

.tdrn__progress-bar {
  display: block;
  inline-size: calc(var(--tdrn-progress, 0) * 100%);
  block-size: 100%;
  background: currentColor;
  opacity: .7;
  transition: inline-size .12s linear;
}

.tdrn__item.is-active-ancestor > .tdrn__link {
  font-weight: 650;
}

.tdrn__item.is-active-ancestor > .tdrn__link .tdrn__marker {
  background: currentColor;
  opacity: .55;
}

.tdrn-heading-anchor {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-inline-start: .35em;
  font-size: .72em;
  line-height: 1;
  text-decoration: none;
  opacity: 0;
  transition: opacity .16s ease;
}

.tdrn-heading:hover .tdrn-heading-anchor,
.tdrn-heading:focus-within .tdrn-heading-anchor,
.tdrn-heading-anchor:focus-visible {
  opacity: .6;
}

.tdrn-heading-anchor:hover,
.tdrn-heading-anchor:focus-visible {
  opacity: 1;
}

@media print {
  .tdrn {
    break-inside: avoid;
    box-shadow: none !important;
  }

  .tdrn__summary::after,
  .tdrn__progress,
  .tdrn-heading-anchor {
    display: none !important;
  }
}

.tdrn--mounted {
  margin-block-start: 0;
  margin-block-end: 1rem;
  inline-size: 100%;
}

.tdrn.is-scroll-synced .tdrn__link:not(.is-active):not(:hover):not(:focus-visible) {
  opacity: .82;
}

.tdrn.is-scroll-synced .tdrn__item.is-active-ancestor > .tdrn__link {
  opacity: .95;
}

.tdrn__mount-placeholder {
  display: none;
}

.tdrn--policy-color_article .tdrn__title::before {
  content: "";
  display: inline-block;
  inline-size: .55em;
  block-size: .55em;
  border-radius: 999px;
  margin-inline-end: .45em;
  background: currentColor;
  opacity: .45;
}

.tdrn--policy-semantic_surface {
  --tdrn-bg: color-mix(in srgb, Canvas 98%, currentColor 2%);
}

/* v0.7: TotalDesign / Elementor layout integration */
.tdrn--desktop-sidebar_mount.tdrn--mounted-sidebar {
  margin-block: 0 1rem;
  inline-size: 100%;
}

.tdrn--mounted-sidebar .tdrn__details {
  background: color-mix(in srgb, Canvas 94%, currentColor 6%);
  backdrop-filter: blur(8px);
}

.tdrn--mount-fallback {
  border-block-start: 2px solid var(--tdrn-border);
  padding-block-start: .75rem;
}

.tdrn--desktop-inline_then_float.tdrn--sticky {
  margin-block: 1.25rem 1.75rem;
}

@media (min-width: 1100px) {
  .tdrn--desktop-inline_then_float.tdrn--sticky {
    float: right;
    inline-size: min(320px, 38%);
    margin-inline-start: 1.35rem;
    margin-block-start: .25rem;
  }

  .tdrn--desktop-sidebar_mount.tdrn--mounted-sidebar .tdrn__details {
    border-radius: 20px;
  }

  .tdrn-sidebar-slot,
  .td-single-sidebar {
    container-type: inline-size;
  }
}

@media (max-width: 720px) {
  .tdrn--mobile-disabled {
    display: none !important;
  }

  .tdrn--mobile-inline_collapsed .tdrn__details:not([open]) .tdrn__progress {
    display: none;
  }
}