/* Dynamic Island TOC */

.dm-island-toc {
  --dm-island-z: 120;
  --dm-toc-text-width: auto;
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: var(--dm-island-z);
}

.dm-island-toc__backdrop {
  position: fixed;
  inset: 0;
  background: color-mix(in srgb, var(--dm-bg) 55%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  transition: opacity 280ms ease;
  pointer-events: auto;
}

.dm-island-toc.is-open .dm-island-toc__backdrop {
  opacity: 1;
}

.dm-island-toc__dock {
  pointer-events: none;
}

.dm-island-toc__panel {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -48%) scale(0.96);
  width: min(400px, calc(100vw - 32px));
  max-height: min(70vh, 520px);
  display: flex;
  flex-direction: column;
  padding: 22px 22px 18px;
  border-radius: 32px;
  border: 1px solid color-mix(in srgb, var(--dm-line) 80%, transparent);
  background: color-mix(in srgb, var(--dm-bg-elev) 90%, transparent);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow:
    0 24px 64px color-mix(in srgb, var(--dm-text) 14%, transparent),
    0 2px 8px color-mix(in srgb, var(--dm-text) 6%, transparent);
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 280ms ease,
    transform 320ms cubic-bezier(0.22, 1, 0.36, 1),
    visibility 0s linear 320ms;
  pointer-events: auto;
  overflow: hidden;
}

.dm-island-toc.is-open .dm-island-toc__panel {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -50%) scale(1);
  transition:
    opacity 280ms ease,
    transform 320ms cubic-bezier(0.22, 1, 0.36, 1),
    visibility 0s;
}

.dm-island-toc__panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  flex-shrink: 0;
}

.dm-island-toc__panel-label {
  margin: 0;
  font-family: var(--dm-font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dm-text-3);
}

.dm-island-toc__close {
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 999px;
  background: color-mix(in srgb, var(--dm-surface-2) 80%, transparent);
  color: var(--dm-text-2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 180ms, color 180ms;
}

.dm-island-toc__close:hover {
  background: var(--dm-surface-2);
  color: var(--dm-text);
}

.dm-island-toc__close svg {
  width: 16px;
  height: 16px;
  stroke-width: 2;
}

.dm-island-toc__list {
  list-style: none;
  margin: 0;
  padding: 4px 4px 8px;
  overflow-y: auto;
  flex: 1 1 auto;
  text-align: left;
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--dm-text) 28%, transparent) transparent;
}

.dm-island-toc__list::-webkit-scrollbar {
  width: 4px;
}

.dm-island-toc__list::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--dm-text) 28%, transparent);
  border-radius: 999px;
}

.dm-island-toc__item {
  margin: 0;
  text-align: left;
}

.dm-island-toc__item a {
  display: block;
  padding: 8px 10px;
  font-family: var(--dm-font-body);
  font-size: 15px;
  line-height: 1.45;
  color: var(--dm-text-2);
  text-decoration: none;
  text-align: left;
  border-radius: 8px;
  border-left: 2px solid transparent;
  transition: color 180ms, background 180ms, border-color 180ms;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dm-island-toc__item--level-2 a {
  font-family: var(--dm-font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--dm-text);
  padding-left: 10px;
}

.dm-island-toc__item--level-3 a {
  font-size: 14px;
  padding-left: 24px;
}

.dm-island-toc__item--level-4 a {
  font-size: 14px;
  padding-left: 38px;
  color: var(--dm-text-3);
}

.dm-island-toc__item--level-5 a {
  font-size: 13px;
  padding-left: 52px;
  color: var(--dm-text-3);
}

.dm-island-toc__item--level-6 a {
  font-size: 13px;
  padding-left: 66px;
  color: var(--dm-text-3);
}

.dm-island-toc__item a:hover {
  color: var(--dm-accent);
  background: color-mix(in srgb, var(--dm-accent) 8%, transparent);
}

.dm-island-toc__item a.is-active {
  color: var(--dm-accent);
  font-weight: 600;
  border-left-color: var(--dm-accent);
  background: color-mix(in srgb, var(--dm-accent) 6%, transparent);
}

.dm-island-toc__item--level-2 a.is-active {
  color: var(--dm-text);
}

.dm-island-toc__trigger {
  position: fixed;
  left: 50%;
  bottom: max(20px, env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 12px;
  box-sizing: border-box;
  width: fit-content !important;
  max-width: calc(100vw - 24px);
  min-width: 0;
  padding: 10px 14px 10px 10px;
  border: 1px solid color-mix(in srgb, var(--dm-line) 85%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--dm-bg-elev) 92%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow:
    0 12px 40px color-mix(in srgb, var(--dm-text) 12%, transparent),
    0 1px 0 color-mix(in srgb, var(--dm-bg) 40%, transparent) inset;
  color: var(--dm-text);
  cursor: pointer;
  pointer-events: auto;
  transition:
    transform 280ms cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 280ms ease,
    opacity 280ms ease;
  z-index: calc(var(--dm-island-z) + 1);
}

.dm-island-toc__trigger:hover {
  box-shadow:
    0 16px 48px color-mix(in srgb, var(--dm-text) 16%, transparent),
    0 1px 0 color-mix(in srgb, var(--dm-bg) 40%, transparent) inset;
}

.dm-island-toc__trigger:focus-visible {
  outline: 2px solid var(--dm-accent);
  outline-offset: 3px;
}

.dm-island-toc.is-open .dm-island-toc__trigger {
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(12px);
}

.dm-island-toc__ring {
  position: relative;
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
}

.dm-island-toc__ring-svg {
  position: absolute;
  inset: 0;
  width: 44px;
  height: 44px;
  transform: rotate(-90deg);
  display: block;
}

.dm-island-toc__pct {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  font-family: var(--dm-font-body);
  font-size: 10px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--dm-text);
  font-variant-numeric: tabular-nums;
  pointer-events: none;
}

.dm-island-toc__ring-track,
.dm-island-toc__ring-progress {
  fill: none;
  stroke-width: 3;
}

.dm-island-toc__ring-track {
  stroke: color-mix(in srgb, var(--dm-line) 90%, transparent);
}

.dm-island-toc__ring-progress {
  stroke: var(--dm-accent);
  stroke-linecap: round;
  stroke-dasharray: 113.1;
  stroke-dashoffset: 113.1;
  transition: stroke-dashoffset 120ms linear;
}

.dm-island-toc__trigger-text {
  flex: 0 0 auto !important;
  flex-grow: 0 !important;
  width: auto;
  min-width: 0;
  max-width: none;
  min-height: 44px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.dm-island-toc__current {
  font-family: var(--dm-font-display);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--dm-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: auto;
  max-width: 100%;
  text-align: center;
  display: block;
}

.dm-island-toc__trigger-icon {
  flex: 0 0 auto;
  color: var(--dm-text-3);
  display: inline-flex;
}

.dm-island-toc__trigger-icon svg {
  width: 18px;
  height: 18px;
  stroke-width: 2;
  transition: transform 280ms ease;
}

.dm-island-toc.is-open .dm-island-toc__trigger-icon svg {
  transform: rotate(180deg);
}

/* Mobile: full-width dock, list folds up (no modal) */
@media (max-width: 640px) {
  .dm-island-toc__backdrop {
    display: none !important;
  }

  .dm-island-toc__dock {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: calc(var(--dm-island-z) + 1);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    pointer-events: auto;
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }

  .dm-island-toc__panel {
    position: relative;
    left: auto;
    top: auto;
    transform: none;
    width: 100%;
    max-width: 100%;
    max-height: 0;
    opacity: 1;
    visibility: visible;
    margin: 0;
    padding: 0 16px;
    border: 0;
    border-top: 1px solid transparent;
    border-radius: 16px 16px 0 0;
    box-shadow: none;
    overflow: hidden;
    order: 1;
    transition:
      max-height 320ms cubic-bezier(0.22, 1, 0.36, 1),
      padding 320ms cubic-bezier(0.22, 1, 0.36, 1),
      border-color 200ms ease;
  }

  .dm-island-toc__panel[aria-hidden='true'] {
    pointer-events: none;
  }

  .dm-island-toc.is-open .dm-island-toc__panel {
    max-height: min(52vh, 400px);
    padding: 14px 16px 8px;
    border-top-color: var(--dm-line);
    box-shadow: 0 -12px 40px color-mix(in srgb, var(--dm-text) 10%, transparent);
    background: color-mix(in srgb, var(--dm-bg-elev) 96%, transparent);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    /* Override desktop centered modal transform (same specificity as .is-open rule) */
    transform: none;
    left: auto;
    top: auto;
  }

  .dm-island-toc {
    inset: auto;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    height: auto;
  }

  .dm-island-toc__panel-head {
    margin-bottom: 10px;
  }

  .dm-island-toc__close {
    display: none;
  }

  .dm-island-toc__list {
    max-height: min(44vh, 340px);
    padding-bottom: 4px;
  }

  .dm-island-toc__trigger {
    position: relative;
    left: auto;
    bottom: auto;
    transform: none;
    order: 2;
    width: 100% !important;
    max-width: 100%;
    border-radius: 0;
    border-left: 0;
    border-right: 0;
    border-bottom: 0;
    padding: 10px 14px;
    gap: 10px;
    opacity: 1 !important;
    pointer-events: auto !important;
  }

  .dm-island-toc.is-open .dm-island-toc__trigger {
    transform: none;
    border-top: 1px solid var(--dm-line);
  }

  .dm-island-toc__trigger-text {
    flex: 1 1 auto !important;
    width: auto !important;
    min-width: 0;
    max-width: none;
    align-items: flex-start;
    text-align: left;
  }

  .dm-island-toc__current {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
    text-align: left;
    font-size: 13px;
  }

  .dm-island-toc__ring {
    flex: 0 0 40px;
    width: 40px;
    height: 40px;
  }

  .dm-island-toc__ring-svg {
    width: 40px;
    height: 40px;
  }
}

body.dm-island-toc-open {
  overflow: hidden;
}

body.dm-island-toc-mobile:has(.dm-island-toc) .dm-single,
body.dm-island-toc-mobile:has(.dm-island-toc) .dm-page {
  padding-bottom: calc(72px + env(safe-area-inset-bottom, 0px));
}

body.dm-island-toc-mobile.dm-island-toc-open:has(.dm-island-toc) .dm-single,
body.dm-island-toc-mobile.dm-island-toc-open:has(.dm-island-toc) .dm-page {
  padding-bottom: calc(88px + env(safe-area-inset-bottom, 0px));
}

@media (prefers-reduced-motion: reduce) {
  .dm-island-toc__backdrop,
  .dm-island-toc__panel,
  .dm-island-toc__trigger,
  .dm-island-toc__ring-progress,
  .dm-island-toc__trigger-icon svg {
    transition: none;
  }
}