/* ==========================================================================
   kt.css — interaction and layout layer for kingatshering10.github.io
   Site-owned page styling. Builds on al-folio's CSS custom properties so
   every rule below follows the theme into dark mode automatically.
   ========================================================================== */

:root {
  --kt-radius: 1rem;
  --kt-radius-sm: 0.7rem;
  --kt-shadow: 0 4px 14px rgba(0, 0, 0, 0.06);
  --kt-shadow-lift: 0 14px 34px rgba(0, 0, 0, 0.14);
  --kt-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --kt-surface: var(--global-card-bg-color, var(--global-bg-color));
}

/* --------------------------------------------------------------- reveal -- */

.kt-js .kt-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.65s var(--kt-ease),
    transform 0.65s var(--kt-ease);
  will-change: opacity, transform;
}

.kt-js .kt-reveal.kt-in {
  opacity: 1;
  transform: none;
}

/* ----------------------------------------------------------------- hero -- */

.kt-hero {
  position: relative;
  overflow: hidden;
  margin: 1.2rem 0 2rem;
  padding: 1.6rem 1.75rem;
  border-radius: var(--kt-radius);
  border: 1px solid var(--global-divider-color);
  background: var(--global-code-bg-color);
}

.kt-hero::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: var(--global-theme-color);
}

.kt-hero::after {
  content: "";
  position: absolute;
  top: -55%;
  right: -12%;
  width: 24rem;
  height: 24rem;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--global-theme-color) 22%, transparent), transparent 68%);
  animation: kt-drift 16s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes kt-drift {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(-2.5rem, 2rem, 0) scale(1.14);
  }
}

.kt-hero > * {
  position: relative;
  z-index: 1;
}

.kt-eyebrow {
  display: inline-block;
  margin-bottom: 0.65rem;
  padding: 0.24rem 0.7rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--global-theme-color) 14%, transparent);
  color: var(--global-theme-color);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* -------------------------------------------------------------- rotator -- */

.kt-rotator {
  display: inline-block;
  position: relative;
  min-width: 12ch;
  color: var(--global-theme-color);
  font-weight: 700;
}

.kt-rotator span {
  display: inline-block;
  animation: kt-rot-in 0.5s var(--kt-ease);
}

.kt-rotator::after {
  content: "";
  display: inline-block;
  width: 2px;
  height: 1em;
  margin-left: 2px;
  vertical-align: -0.14em;
  background: var(--global-theme-color);
  animation: kt-caret 1s steps(1) infinite;
}

@keyframes kt-rot-in {
  from {
    opacity: 0;
    transform: translateY(-0.4em);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes kt-caret {
  50% {
    opacity: 0;
  }
}

/* -------------------------------------------------------------- actions -- */

.kt-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.15rem;
}

.kt-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.95rem;
  border: 1px solid var(--global-theme-color);
  border-radius: 999px;
  color: var(--global-theme-color);
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none;
  overflow: hidden;
  transition:
    color 0.25s var(--kt-ease),
    transform 0.25s var(--kt-ease),
    box-shadow 0.25s var(--kt-ease);
}

.kt-btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--global-theme-color);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.32s var(--kt-ease);
  z-index: -1;
}

.kt-btn:hover,
.kt-btn:focus-visible {
  color: var(--global-bg-color);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: var(--kt-shadow-lift);
}

.kt-btn:hover::before,
.kt-btn:focus-visible::before {
  transform: scaleX(1);
}

.kt-btn--solid {
  background: var(--global-theme-color);
  color: var(--global-bg-color);
}

/* ---------------------------------------------------------------- stats -- */

.kt-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 0.8rem;
  margin: 1.6rem 0;
}

.kt-stat {
  padding: 1rem 0.9rem;
  border: 1px solid var(--global-divider-color);
  border-radius: var(--kt-radius-sm);
  background: var(--kt-surface);
  text-align: center;
  box-shadow: var(--kt-shadow);
  transition:
    transform 0.3s var(--kt-ease),
    box-shadow 0.3s var(--kt-ease),
    border-color 0.3s var(--kt-ease);
}

.kt-stat:hover {
  transform: translateY(-4px);
  border-color: var(--global-theme-color);
  box-shadow: var(--kt-shadow-lift);
}

.kt-stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--global-theme-color);
  font-variant-numeric: tabular-nums;
}

.kt-stat-label {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.8rem;
  color: var(--global-text-color-light);
}

/* ---------------------------------------------------------------- cards -- */

.kt-grid {
  display: grid;
  gap: 1.2rem;
  margin-top: 1.5rem;
}

.kt-grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
}

.kt-card {
  position: relative;
  padding: 1.3rem 1.45rem;
  border: 1px solid var(--global-divider-color);
  border-radius: var(--kt-radius);
  background: var(--kt-surface);
  box-shadow: var(--kt-shadow);
  overflow: hidden;
  transition:
    transform 0.3s var(--kt-ease),
    box-shadow 0.3s var(--kt-ease),
    border-color 0.3s var(--kt-ease);
}

.kt-card::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  background: radial-gradient(
    32rem circle at var(--kt-mx, 50%) var(--kt-my, 50%),
    color-mix(in srgb, var(--global-theme-color) 10%, transparent),
    transparent 45%
  );
  transition: opacity 0.3s var(--kt-ease);
}

.kt-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--global-theme-color) 55%, var(--global-divider-color));
  box-shadow: var(--kt-shadow-lift);
}

.kt-card:hover::after {
  opacity: 1;
}

.kt-card-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  color: var(--global-theme-color);
  font-size: 1.12rem;
  font-weight: 700;
}

.kt-card-meta {
  margin-bottom: 0.7rem;
  color: var(--global-text-color-light);
  font-size: 0.9rem;
}

/* --------------------------------------------------------------- badges -- */

.kt-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.75rem 0;
}

.kt-badge {
  display: inline-block;
  padding: 0.24rem 0.65rem;
  border: 1px solid var(--global-divider-color);
  border-radius: 999px;
  background: var(--global-code-bg-color);
  font-size: 0.78rem;
  font-weight: 600;
  transition:
    transform 0.2s var(--kt-ease),
    border-color 0.2s var(--kt-ease),
    color 0.2s var(--kt-ease);
}

.kt-badge:hover {
  transform: translateY(-2px);
  border-color: var(--global-theme-color);
  color: var(--global-theme-color);
}

.kt-badge--accent {
  border-color: transparent;
  background: color-mix(in srgb, var(--global-theme-color) 15%, transparent);
  color: var(--global-theme-color);
}

.kt-status {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.02em;
}

.kt-is-accepted,
.kt-is-published {
  background: #16a34a;
}

.kt-is-review {
  background: #f59e0b;
}

/* --------------------------------------------------------------- chips --- */

.kt-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: 1.1rem 0 1.4rem;
}

.kt-filter-label {
  margin-right: 0.2rem;
  color: var(--global-text-color-light);
  font-size: 0.82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.kt-chip {
  padding: 0.32rem 0.8rem;
  border: 1px solid var(--global-divider-color);
  border-radius: 999px;
  background: transparent;
  color: var(--global-text-color);
  font-family: inherit;
  font-size: 0.83rem;
  font-weight: 600;
  cursor: pointer;
  transition:
    background 0.22s var(--kt-ease),
    color 0.22s var(--kt-ease),
    border-color 0.22s var(--kt-ease),
    transform 0.22s var(--kt-ease);
}

.kt-chip:hover {
  transform: translateY(-2px);
  border-color: var(--global-theme-color);
  color: var(--global-theme-color);
}

.kt-chip[aria-pressed="true"] {
  background: var(--global-theme-color);
  border-color: var(--global-theme-color);
  color: var(--global-bg-color);
}

.kt-chip-count {
  margin-left: 0.35rem;
  opacity: 0.65;
  font-weight: 500;
}

.kt-hidden {
  display: none !important;
}

.kt-empty {
  padding: 1.5rem;
  border: 1px dashed var(--global-divider-color);
  border-radius: var(--kt-radius-sm);
  color: var(--global-text-color-light);
  text-align: center;
}

/* ------------------------------------------------------------- timeline -- */

.kt-timeline {
  position: relative;
  margin-top: 1.6rem;
  padding-left: 1.9rem;
}

.kt-timeline::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  bottom: 0.5rem;
  left: 0.42rem;
  width: 2px;
  background: linear-gradient(180deg, var(--global-theme-color), color-mix(in srgb, var(--global-theme-color) 16%, transparent));
}

.kt-tl-item {
  position: relative;
  margin-bottom: 1.4rem;
}

.kt-tl-item::before {
  content: "";
  position: absolute;
  top: 1.45rem;
  left: -1.68rem;
  width: 0.82rem;
  height: 0.82rem;
  border: 2px solid var(--global-theme-color);
  border-radius: 50%;
  background: var(--global-bg-color);
  transition:
    transform 0.28s var(--kt-ease),
    background 0.28s var(--kt-ease);
}

.kt-tl-item:hover::before {
  transform: scale(1.35);
  background: var(--global-theme-color);
}

.kt-tl-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.6rem;
  align-items: baseline;
}

.kt-tl-title {
  font-size: 1.14rem;
  font-weight: 700;
  color: var(--global-theme-color);
}

.kt-tl-date {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--global-text-color-light);
  font-variant-numeric: tabular-nums;
}

.kt-tl-org {
  font-weight: 600;
}

.kt-tl-sub {
  margin-bottom: 0.6rem;
  color: var(--global-text-color-light);
  font-size: 0.92rem;
}

/* ------------------------------------------------------------- details --- */

.kt-details {
  margin-top: 0.75rem;
  border-top: 1px solid var(--global-divider-color);
  padding-top: 0.6rem;
}

.kt-details > summary {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  color: var(--global-theme-color);
  font-weight: 600;
  font-size: 0.92rem;
  list-style: none;
}

.kt-details > summary::-webkit-details-marker {
  display: none;
}

.kt-details > summary::before {
  content: "›";
  display: inline-block;
  font-size: 1.2rem;
  line-height: 1;
  transition: transform 0.28s var(--kt-ease);
}

.kt-details[open] > summary::before {
  transform: rotate(90deg);
}

.kt-details > summary:hover {
  text-decoration: underline;
}

.kt-details[open] > *:not(summary) {
  animation: kt-unfold 0.4s var(--kt-ease);
}

@keyframes kt-unfold {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* ------------------------------------------------------------ pub list --- */

.kt-pub {
  position: relative;
  padding: 1.15rem 1.3rem;
  margin-bottom: 0.9rem;
  border: 1px solid var(--global-divider-color);
  border-left: 3px solid transparent;
  border-radius: var(--kt-radius-sm);
  background: var(--kt-surface);
  transition:
    transform 0.28s var(--kt-ease),
    border-left-color 0.28s var(--kt-ease),
    box-shadow 0.28s var(--kt-ease);
}

.kt-pub:hover {
  transform: translateX(4px);
  border-left-color: var(--global-theme-color);
  box-shadow: var(--kt-shadow-lift);
}

.kt-pub-venue {
  display: inline-block;
  margin-bottom: 0.4rem;
  color: var(--global-theme-color);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.kt-pub-title {
  margin-bottom: 0.3rem;
  font-size: 1.03rem;
  font-weight: 700;
  line-height: 1.4;
}

.kt-pub-authors {
  font-size: 0.9rem;
  color: var(--global-text-color-light);
  line-height: 1.55;
}

.kt-pub-authors strong {
  color: var(--global-text-color);
}

/* ---------------------------------------------------------- skill meter -- */

.kt-skills {
  display: grid;
  gap: 0.75rem;
  margin-top: 1rem;
}

.kt-skill-row {
  display: grid;
  grid-template-columns: minmax(7.5rem, 11rem) 1fr;
  gap: 0.9rem;
  align-items: center;
}

.kt-skill-name {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--global-text-color-light);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

@media (max-width: 576px) {
  .kt-skill-row {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

/* ------------------------------------------------------- reduced motion -- */

@media (prefers-reduced-motion: reduce) {
  .kt-js .kt-reveal,
  .kt-js .kt-reveal.kt-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .kt-hero::after,
  .kt-rotator span,
  .kt-rotator::after,
  .kt-details[open] > *:not(summary) {
    animation: none;
  }

  .kt-btn,
  .kt-card,
  .kt-stat,
  .kt-badge,
  .kt-chip,
  .kt-pub,
  .kt-tl-item::before {
    transition: none;
  }

  .kt-card:hover,
  .kt-stat:hover,
  .kt-btn:hover,
  .kt-badge:hover,
  .kt-chip:hover,
  .kt-pub:hover {
    transform: none;
  }
}

/* ==========================================================================
   Motion layer — hero constellation, tilt, magnetic buttons, staggered
   entrances, scroll-drawn timelines. Every rule here is decorative; the
   reduced-motion block at the end disables the lot.
   ========================================================================== */

/* --------------------------------------------------- hero constellation -- */

.kt-hero > canvas.kt-constellation {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  pointer-events: none;
  transition: opacity 1.1s var(--kt-ease);
}

.kt-hero > canvas.kt-constellation.kt-in {
  opacity: 1;
}

/* ------------------------------------------------------ hero entrance --- */

.kt-js .kt-enter {
  opacity: 0;
  transform: translateY(14px);
}

.kt-js .kt-enter.kt-in {
  opacity: 1;
  transform: none;
  transition:
    opacity 0.7s var(--kt-ease),
    transform 0.7s var(--kt-ease);
}

/* ------------------------------------------------------------- tilt ----- */

.kt-tilt {
  transform-style: preserve-3d;
  will-change: transform;
}

/* --------------------------------------------------- magnetic buttons --- */

.kt-btn {
  will-change: transform;
}

/* Shine sweep across a stat tile on hover. */
.kt-stat {
  position: relative;
  overflow: hidden;
}

.kt-stat::after {
  content: "";
  position: absolute;
  top: 0;
  left: -140%;
  width: 60%;
  height: 100%;
  background: linear-gradient(100deg, transparent, color-mix(in srgb, var(--global-theme-color) 16%, transparent), transparent);
  transition: left 0.75s var(--kt-ease);
  pointer-events: none;
}

.kt-stat:hover::after {
  left: 140%;
}

/* ------------------------------------------------ scroll-drawn timeline -- */

.kt-timeline::before {
  transform: scaleY(var(--kt-tl-progress, 1));
  transform-origin: top center;
  transition: transform 0.18s linear;
}

.kt-tl-item::before {
  background: var(--global-bg-color);
}

.kt-tl-item.kt-tl-lit::before {
  background: var(--global-theme-color);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--global-theme-color) 18%, transparent);
}

/* --------------------------------------------------- heading underline -- */

.kt-uline {
  position: relative;
  display: inline-block;
}

.kt-uline::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.18em;
  height: 3px;
  width: 100%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--global-theme-color), color-mix(in srgb, var(--global-theme-color) 25%, transparent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.75s var(--kt-ease);
}

.kt-uline.kt-in::after {
  transform: scaleX(1);
}

/* ------------------------------------------------------ reduced motion -- */

@media (prefers-reduced-motion: reduce) {
  .kt-js .kt-enter,
  .kt-js .kt-enter.kt-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .kt-hero > canvas.kt-constellation {
    display: none;
  }

  .kt-timeline::before {
    transform: none;
    transition: none;
  }

  .kt-uline::after {
    transform: scaleX(1);
    transition: none;
  }

  .kt-stat::after {
    display: none;
  }

  .kt-tilt {
    transform: none !important;
  }
}

/* ==========================================================================
   News feed — al-folio renders announcements as a two-column table. kt.js
   rebuilds that into the structure below; the table still renders on its own
   if the script never runs.
   ========================================================================== */

.kt-feed {
  position: relative;
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0 0 0 1.9rem;
}

.kt-feed::before {
  content: "";
  position: absolute;
  top: 0.6rem;
  bottom: 0.6rem;
  left: 0.42rem;
  width: 2px;
  background: linear-gradient(180deg, var(--global-theme-color), color-mix(in srgb, var(--global-theme-color) 16%, transparent));
  transform: scaleY(var(--kt-tl-progress, 1));
  transform-origin: top center;
  transition: transform 0.18s linear;
}

.kt-feed-item {
  position: relative;
  margin-bottom: 1rem;
}

.kt-feed-marker {
  position: absolute;
  top: 1.15rem;
  left: -1.68rem;
  width: 0.82rem;
  height: 0.82rem;
  border: 2px solid var(--global-theme-color);
  border-radius: 50%;
  background: var(--global-bg-color);
  transition:
    transform 0.3s var(--kt-ease),
    background 0.3s var(--kt-ease),
    box-shadow 0.3s var(--kt-ease);
}

.kt-feed-item.kt-tl-lit .kt-feed-marker {
  background: var(--global-theme-color);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--global-theme-color) 18%, transparent);
}

.kt-feed-item:hover .kt-feed-marker {
  transform: scale(1.35);
}

.kt-feed-card {
  padding: 0.95rem 1.15rem;
  border: 1px solid var(--global-divider-color);
  border-left: 3px solid transparent;
  border-radius: var(--kt-radius-sm);
  background: var(--kt-surface);
  transition:
    transform 0.28s var(--kt-ease),
    border-left-color 0.28s var(--kt-ease),
    box-shadow 0.28s var(--kt-ease);
}

.kt-feed-item:hover .kt-feed-card {
  transform: translateX(4px);
  border-left-color: var(--global-theme-color);
  box-shadow: var(--kt-shadow-lift);
}

.kt-feed-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.kt-feed-date {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--global-theme-color);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.kt-feed-rel {
  font-size: 0.78rem;
  color: var(--global-text-color-light);
}

.kt-feed-rel::before {
  content: "·";
  margin-right: 0.5rem;
}

.kt-feed-body {
  line-height: 1.6;
}

.kt-feed-body p:last-child {
  margin-bottom: 0;
}

.kt-is-milestone {
  background: #6366f1;
}

@media (prefers-reduced-motion: reduce) {
  .kt-feed::before {
    transform: none;
    transition: none;
  }

  .kt-feed-marker,
  .kt-feed-card {
    transition: none;
  }

  .kt-feed-item:hover .kt-feed-marker,
  .kt-feed-item:hover .kt-feed-card {
    transform: none;
  }
}

/* ==========================================================================
   Publication entries — jekyll-scholar emits plain <li>; these lift them into
   cards and make filtering a transition rather than a jump.
   ========================================================================== */

.publications ol.bibliography > li {
  padding: 0.9rem 1rem;
  margin-bottom: 0.5rem;
  border: 1px solid transparent;
  border-left: 3px solid transparent;
  border-radius: var(--kt-radius-sm);
  transition:
    transform 0.28s var(--kt-ease),
    border-color 0.28s var(--kt-ease),
    background 0.28s var(--kt-ease),
    box-shadow 0.28s var(--kt-ease),
    opacity 0.3s var(--kt-ease);
}

.publications ol.bibliography > li:hover {
  transform: translateX(5px);
  border-color: var(--global-divider-color);
  border-left-color: var(--global-theme-color);
  background: var(--kt-surface);
  box-shadow: var(--kt-shadow-lift);
}

/* Filtering fades entries out rather than snapping them away. */
.publications ol.bibliography > li.kt-filtering {
  opacity: 0;
  transform: scale(0.97);
}

/* ------------------------------------------------------------ section rail */

.kt-rail {
  position: fixed;
  top: 50%;
  right: 1.4rem;
  transform: translateY(-50%);
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.kt-rail-dot {
  position: relative;
  width: 0.62rem;
  height: 0.62rem;
  padding: 0;
  border: 2px solid color-mix(in srgb, var(--global-text-color) 32%, transparent);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  transition:
    transform 0.28s var(--kt-ease),
    border-color 0.28s var(--kt-ease),
    background 0.28s var(--kt-ease);
}

.kt-rail-dot:hover,
.kt-rail-dot:focus-visible {
  border-color: var(--global-theme-color);
  transform: scale(1.3);
}

.kt-rail-dot[aria-current="true"] {
  border-color: var(--global-theme-color);
  background: var(--global-theme-color);
  transform: scale(1.25);
}

/* Label appears on hover, to the left of the dot. */
.kt-rail-dot::after {
  content: attr(data-label);
  position: absolute;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%) translateX(6px);
  padding: 0.2rem 0.55rem;
  border-radius: 0.4rem;
  background: var(--global-theme-color);
  color: var(--global-bg-color);
  font-size: 0.74rem;
  font-weight: 600;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.24s var(--kt-ease),
    transform 0.24s var(--kt-ease);
}

.kt-rail-dot:hover::after,
.kt-rail-dot:focus-visible::after {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

/* The rail would collide with content on narrow screens. */
@media (max-width: 1200px) {
  .kt-rail {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .publications ol.bibliography > li,
  .kt-rail-dot,
  .kt-rail-dot::after {
    transition: none;
  }

  .publications ol.bibliography > li:hover,
  .kt-rail-dot:hover {
    transform: none;
  }
}

/* ==========================================================================
   Site-wide transitions — navigation, theme change, nav links.
   ========================================================================== */

/* ------------------------------------------------------ page transition -- */

.kt-js body {
  animation: kt-page-in 0.42s var(--kt-ease);
}

@keyframes kt-page-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* Applied only while a same-origin navigation is in flight; JS always clears
   it, so a cancelled navigation cannot leave the page blank. */
.kt-js body.kt-leaving {
  opacity: 0;
  transition: opacity 0.2s var(--kt-ease);
}

/* ------------------------------------------------------- nav underline --- */

.kt-js nav .nav-link {
  position: relative;
}

.kt-js nav .nav-link::after {
  content: "";
  position: absolute;
  left: 0.5rem;
  right: 0.5rem;
  bottom: 0.15rem;
  height: 2px;
  border-radius: 2px;
  background: var(--global-theme-color);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.28s var(--kt-ease);
}

.kt-js nav .nav-link:hover::after,
.kt-js nav .nav-item.active .nav-link::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* -------------------------------------------------------------- 404 ----- */

.kt-404-code {
  font-size: clamp(4rem, 16vw, 9rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  background: linear-gradient(120deg, var(--global-theme-color), color-mix(in srgb, var(--global-theme-color) 35%, transparent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

@media (prefers-reduced-motion: reduce) {
  .kt-js body,
  .kt-js body.kt-leaving {
    animation: none;
    opacity: 1;
    transition: none;
  }

  .kt-js nav .nav-link::after {
    transition: none;
  }
}

/* ----------------------------------------------------- research explainer */

.kt-explainer {
  margin: 1.5rem 0 2rem;
  padding: 1.5rem;
  border: 1px solid var(--global-divider-color);
  border-radius: var(--kt-radius);
  background: var(--kt-surface);
  box-shadow: var(--kt-shadow);
}

.kt-exp-intro p {
  margin: 0.5rem 0 0;
  max-width: 60ch;
  color: var(--global-text-color);
}

.kt-exp-body {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: 1.5rem;
  margin-top: 1.4rem;
  align-items: start;
}

@media (max-width: 760px) {
  .kt-exp-body {
    grid-template-columns: 1fr;
  }
}

/* 2x2 grid ----------------------------------------------------------------- */

.kt-exp-grid {
  display: grid;
  grid-template-columns: auto 1fr 1fr;
  grid-template-rows: auto 1fr 1fr;
  gap: 0.5rem;
}

.kt-exp-corner {
  grid-column: 1;
  grid-row: 1;
}

.kt-exp-colh,
.kt-exp-rowh {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--global-text-color-light);
  display: flex;
  align-items: center;
}

.kt-exp-colh {
  justify-content: center;
  text-align: center;
  padding-bottom: 0.2rem;
}

.kt-exp-rowh {
  writing-mode: horizontal-tb;
  max-width: 5.5rem;
  line-height: 1.2;
}

.kt-exp-cell {
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 0.34rem;
  min-height: 4.6rem;
  padding: 0.55rem;
  border: 1px solid var(--global-divider-color);
  border-radius: var(--kt-radius-sm);
  background: var(--global-code-bg-color);
  transition:
    border-color 0.4s var(--kt-ease),
    background 0.4s var(--kt-ease),
    box-shadow 0.4s var(--kt-ease);
}

.kt-exp-dot {
  width: 0.78rem;
  height: 0.78rem;
  border-radius: 50%;
  background: var(--global-divider-color);
}

.kt-exp-dot--correct {
  background: var(--global-theme-color);
}

.kt-exp-dot--wrong {
  background: color-mix(in srgb, var(--global-text-color-light) 55%, transparent);
}

.kt-js .kt-exp-dot {
  animation: kt-exp-pop 0.42s var(--kt-ease) both;
}

@keyframes kt-exp-pop {
  from {
    opacity: 0;
    transform: scale(0.4);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* highlight states driven by the view toggle -------------------------------- */

.kt-exp-grid[data-highlight="strict"] .kt-exp-cell[data-cell="cc"],
.kt-exp-grid[data-highlight="decomp"] .kt-exp-cell[data-cell="cc"],
.kt-exp-grid[data-highlight="decomp"] .kt-exp-cell[data-cell="cw"],
.kt-exp-grid[data-highlight="decomp"] .kt-exp-cell[data-cell="ic"] {
  border-color: var(--global-theme-color);
  background: color-mix(in srgb, var(--global-theme-color) 10%, var(--global-code-bg-color));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--global-theme-color) 35%, transparent);
}

/* side panel --------------------------------------------------------------- */

.kt-exp-controls {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.kt-exp-sliderlabel {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--global-text-color);
}

.kt-exp-sliderval {
  font-variant-numeric: tabular-nums;
  color: var(--global-theme-color);
}

.kt-exp-slider {
  width: 100%;
  accent-color: var(--global-theme-color);
  cursor: pointer;
}

.kt-exp-toggle {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.kt-exp-viewbtn {
  flex: 1 1 auto;
  padding: 0.4rem 0.6rem;
  font: inherit;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--global-text-color-light);
  background: var(--global-code-bg-color);
  border: 1px solid var(--global-divider-color);
  border-radius: 999px;
  cursor: pointer;
  transition:
    color 0.25s var(--kt-ease),
    border-color 0.25s var(--kt-ease),
    background 0.25s var(--kt-ease);
}

.kt-exp-viewbtn[aria-pressed="true"] {
  color: #fff;
  background: var(--global-theme-color);
  border-color: var(--global-theme-color);
}

.kt-exp-stats {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin-top: 1.1rem;
}

.kt-exp-stat {
  opacity: 0.5;
  transition: opacity 0.3s var(--kt-ease);
}

.kt-exp-stat[data-active="1"] {
  opacity: 1;
}

.kt-exp-statline {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.kt-exp-statval {
  font-variant-numeric: tabular-nums;
}

.kt-exp-bar {
  height: 0.42rem;
  border-radius: 999px;
  background: var(--global-divider-color);
  overflow: hidden;
}

.kt-exp-bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--global-theme-color);
  transition: width 0.5s var(--kt-ease);
}

.kt-exp-stat[data-stat="strict"] .kt-exp-bar i {
  background: color-mix(in srgb, var(--global-text-color-light) 60%, transparent);
}

.kt-exp-takeaway {
  margin: 1.1rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--global-divider-color);
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--global-text-color);
}

@media (prefers-reduced-motion: reduce) {
  .kt-js .kt-exp-dot {
    animation: none;
  }
  .kt-exp-cell,
  .kt-exp-bar i,
  .kt-exp-stat,
  .kt-exp-viewbtn {
    transition: none;
  }
}