:root {
  --bg-cream: #f5f0e0;
  --bg-white: #ffffff;
  --bg-yellow: #f5c83c;
  --bg-dark: #1a1a1a;
  --ink: #1a1a1a;
  --muted: #5d584e;
  --muted-light: rgba(255, 255, 255, 0.72);
  --cta: #e8567a;
  --cta-hover: #d54569;
  --line: #1a1a1a;
  --line-light: rgba(255, 255, 255, 0.18);
  --highlight-row: #fff9c4;
  --radius: 6px;
  --container-width: 1100px;
  --section-padding: 80px 40px;
  --nav-height: 88px;
  --transition: 180ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  color: var(--ink);
  background: var(--bg-cream);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

p,
h1,
h2,
h3,
figure,
pre {
  margin: 0;
}

section {
  scroll-margin-top: calc(var(--nav-height) + 24px);
}

.container {
  width: min(100%, var(--container-width));
  margin: 0 auto;
}

.section {
  padding: var(--section-padding);
}

.section-cream {
  background: var(--bg-cream);
}

.section-white {
  background: var(--bg-white);
}

.section-yellow {
  background: var(--bg-yellow);
}

.section-dark {
  background: var(--bg-dark);
  color: var(--bg-white);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-cream);
  border-bottom: 1.5px solid var(--line);
}

.nav-shell {
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 40px;
}

.logo-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px 14px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  font-size: 0.96rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex: 1 1 auto;
  font-size: 0.98rem;
  font-weight: 500;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  position: relative;
  padding: 4px 0;
}

.nav-sep {
  color: var(--muted);
  user-select: none;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 1.5px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 52px;
  padding: 13px 20px;
  border-radius: 999px;
  border: 1.5px solid transparent;
  font-size: 0.98rem;
  font-weight: 500;
  transition:
    transform var(--transition),
    background-color var(--transition),
    color var(--transition),
    border-color var(--transition);
  cursor: pointer;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--cta);
  border-color: var(--cta);
  color: var(--bg-white);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--cta-hover);
  border-color: var(--cta-hover);
}

.btn-outline {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.btn-coming-soon {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.coming-soon-badge {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 8px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: rgba(255,255,255,0.25);
  border: 1px solid rgba(255,255,255,0.5);
  border-radius: 20px;
  vertical-align: middle;
}

.btn-copy {
  position: absolute;
  top: 20px;
  right: 20px;
  min-height: 44px;
  padding: 10px 16px;
  border-color: var(--bg-white);
  background: transparent;
  color: var(--bg-white);
}

.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.eyebrow-light {
  color: var(--muted-light);
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 9px 16px;
  margin-bottom: 24px;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  gap: 44px;
  align-items: center;
}

.hero-copy h1 {
  margin-bottom: 20px;
  font-size: clamp(2rem, 3vw, 2.8rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 800;
}

.hero-authors {
  margin-bottom: 12px;
  max-width: 60rem;
  color: var(--muted);
  font-size: 0.98rem;
}

.hero-affiliations {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 20px;
  margin-bottom: 16px;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.5;
}

.hero-affiliations span {
  display: block;
}

.affil-notes {
  grid-column: 1 / -1;
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 2px;
}

.logo-row a {
  display: inline-flex;
  align-items: center;
}

.logo-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 28px;
  margin-bottom: 28px;
}

.logo-row img {
  height: 38px;
  width: auto;
  filter: grayscale(25%);
  opacity: 0.72;
  transition: filter var(--transition), opacity var(--transition);
}

.logo-row img:hover {
  filter: grayscale(0%);
  opacity: 1;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}

.abstract-card,
.card,
.step-card {
  background: var(--bg-white);
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform var(--transition);
}

.abstract-card:hover,
.card:hover,
.step-card:hover {
  transform: translateY(-2px);
}

.abstract-card {
  max-width: 670px;
}

.abstract-row {
  margin-top: 40px;
}

.abstract-card-wide {
  max-width: 100%;
}

.card-label {
  margin-bottom: 10px;
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero-below {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px 40px;
  padding-top: 32px;
}

.hero-right {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-self: start;
}

.hero-figure {
  align-self: auto;
}

.hero-stats-mini {
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-white);
  padding: 18px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stat-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.stat-task {
  font-size: 0.9rem;
  font-weight: 800;
  min-width: 80px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.stat-delta {
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 500;
}

.framed-figure {
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-white);
}

.framed-figure img {
  width: 100%;
}

.framed-figure figcaption {
  padding: 12px 18px 18px;
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}

.quote-shell {
  text-align: center;
}

.quote-text {
  max-width: 16ch;
  margin: 0 auto 12px;
  font-size: clamp(2rem, 4vw, 3.3rem);
  line-height: 1.05;
  font-weight: 800;
  font-style: italic;
}

.quote-subtext {
  font-size: 1rem;
  font-weight: 500;
}

.section-heading {
  margin-bottom: 34px;
}

.section-heading-center {
  text-align: center;
}

.section-heading h2,
.cta-shell h2,
.heading-light {
  font-size: clamp(2rem, 3vw, 3.1rem);
  line-height: 1;
  letter-spacing: -0.04em;
  font-weight: 800;
}

.heading-light {
  color: var(--bg-white);
}

.cards-grid,
.figure-grid,
.steps-grid {
  display: grid;
  gap: 24px;
}

.cards-grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.figure-grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.steps-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card-icon {
  margin-bottom: 14px;
  font-size: 1.6rem;
  line-height: 1;
}

.card h3,
.step-card h3 {
  margin-bottom: 12px;
  font-size: 1.28rem;
  line-height: 1.08;
  font-weight: 800;
}

.card p:last-child,
.step-card p:last-child,
.abstract-card p:last-child {
  color: var(--muted);
}

.step-card {
  min-height: 100%;
}

.step-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  min-height: 34px;
  margin-bottom: 18px;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--bg-yellow);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.method-figure-shell {
  display: grid;
  justify-items: center;
}

.method-figure {
  width: min(100%, 900px);
}

.table-wrap {
  overflow-x: auto;
  margin-bottom: 28px;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-white);
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead th {
  background: var(--bg-dark);
  color: var(--bg-white);
  font-size: 0.95rem;
  font-weight: 800;
  text-align: left;
}

th,
td {
  padding: 16px 18px;
  border-bottom: 1.5px solid var(--line);
}

tbody tr:last-child td {
  border-bottom: 0;
}

tbody tr:nth-child(even):not(.highlight-row) {
  background: #fbf7ee;
}

.highlight-row {
  background: var(--highlight-row);
  font-weight: 800;
}

.wide-figure {
  margin: 26px 0 24px;
}

.insight-callout {
  margin-top: 32px;
  padding: 22px 26px;
  border-left: 3px solid var(--cta);
  background: #fff8f0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.insight-label {
  font-weight: 700;
  font-size: 0.95rem;
  margin: 0 0 10px;
  color: var(--ink);
}

.insight-callout p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.75;
}

.cta-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.cta-subtext {
  margin-top: 12px;
  font-size: 1rem;
  font-weight: 500;
}

.bibtex-shell {
  position: relative;
  border: 1.5px solid var(--line-light);
  border-radius: var(--radius);
  background: #111111;
  overflow: hidden;
}

.bibtex-shell pre {
  padding: 84px 24px 28px;
  overflow-x: auto;
}

.bibtex-shell code {
  display: block;
  color: var(--bg-white);
  font-family:
    ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  font-size: 0.95rem;
  line-height: 1.7;
  white-space: pre;
}

.site-footer {
  background: var(--bg-cream);
  border-top: 1.5px solid var(--line);
}

.footer-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  padding: 28px 40px;
  font-size: 0.95rem;
}

@media (max-width: 1080px) {
  .hero-grid,
  .figure-grid-2 {
    grid-template-columns: 1fr;
  }

  .steps-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-copy h1 {
    font-size: clamp(1.8rem, 5vw, 2.4rem);
  }

  .cta-shell {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 860px) {
  .cards-grid-3,
  .steps-grid {
    grid-template-columns: 1fr;
  }

  .nav-shell {
    padding: 18px 24px;
  }

  .site-nav {
    justify-content: flex-start;
    flex-wrap: wrap;
    order: 3;
    width: 100%;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 64px 20px;
    --nav-height: 116px;
  }

  .nav-shell,
  .footer-shell {
    padding-left: 20px;
    padding-right: 20px;
  }

  .site-header {
    background: var(--bg-cream);
  }

  .btn-nav {
    margin-left: auto;
  }

  .hero-copy h1 {
    font-size: clamp(1.6rem, 7vw, 2.4rem);
  }

  .button-row {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .btn-copy {
    position: static;
    width: auto;
    margin: 20px 20px 0;
  }

  .bibtex-shell pre {
    padding-top: 20px;
  }

  .footer-shell {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ── 1. Scroll Progress Bar ───────────────────────────────── */
.site-header {
  --scroll-progress: 0;
}
.site-header::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 3px;
  background: var(--cta);
  transform: scaleX(var(--scroll-progress));
  transform-origin: left center;
  z-index: 3;
  pointer-events: none;
}

/* ── 2. Card 3D Tilt ──────────────────────────────────────── */
.card,
.step-card {
  --card-rotate-x: 0deg;
  --card-rotate-y: 0deg;
  --card-lift: 0px;
  transform-style: preserve-3d;
  will-change: transform;
  transition:
    transform 220ms cubic-bezier(0.22, 1, 0.36, 1),
    box-shadow 220ms cubic-bezier(0.22, 1, 0.36, 1);
  transform:
    perspective(1000px)
    rotateX(var(--card-rotate-x))
    rotateY(var(--card-rotate-y))
    translateY(var(--card-lift));
}
.card:hover,
.step-card:hover {
  --card-lift: -4px;
  box-shadow: 0 14px 34px rgba(26, 26, 26, 0.08);
  transform:
    perspective(1000px)
    rotateX(var(--card-rotate-x))
    rotateY(var(--card-rotate-y))
    translateY(var(--card-lift));
}
@media (pointer: coarse) {
  .card, .step-card, .card:hover, .step-card:hover {
    transform: translateY(0);
    box-shadow: none;
  }
}

/* ── 3. Active Nav Highlight ──────────────────────────────── */
.site-nav a.is-active { color: var(--cta); }
.site-nav a.is-active::after { background: var(--cta); transform: scaleX(1); }

/* ── 4. Figure Image Reveal ───────────────────────────────── */
.framed-figure.figure-reveal-x img,
.framed-figure.figure-reveal-y img {
  will-change: clip-path, transform;
  transition:
    clip-path 900ms cubic-bezier(0.22, 1, 0.36, 1),
    transform  900ms cubic-bezier(0.22, 1, 0.36, 1);
}
.framed-figure.figure-reveal-x img { clip-path: inset(0 100% 0 0); transform: scale(1.05); transform-origin: left center; }
.framed-figure.figure-reveal-y img { clip-path: inset(100% 0 0 0);  transform: scale(1.04); transform-origin: center bottom; }
.framed-figure.is-revealed img     { clip-path: inset(0 0 0 0);     transform: scale(1); }

/* ── 5. Table Row Entrance ────────────────────────────────── */
.table-wrap.rows-ready tbody tr td {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity   420ms cubic-bezier(0.22, 1, 0.36, 1),
    transform 420ms cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: calc(var(--row-stagger, 0) * 70ms);
}
.table-wrap.rows-ready tbody tr.is-row-visible td { opacity: 1; transform: translateY(0); }

/* ── 6. Hero Word Reveal ──────────────────────────────────── */
.hero-copy h1 .hero-word {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.65em);
  animation: heroWordReveal 600ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
  animation-delay: calc(var(--word-index, 0) * 30ms);
}
@keyframes heroWordReveal {
  from { opacity: 0; transform: translateY(0.65em); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── 7. Yellow Banner Breathing Gradient ─────────────────── */
.section-yellow {
  background: linear-gradient(120deg, #f5c83c 0%, #f4c43a 38%, #f0b800 100%);
  background-size: 180% 180%;
  animation: yellowBannerBreath 14s ease-in-out infinite;
}
@keyframes yellowBannerBreath {
  0%, 100% { background-position: 0% 50%; }
  50%       { background-position: 100% 50%; }
}

/* ── 8. Highlight Row Pulse ───────────────────────────────── */
.highlight-row td {
  position: relative;
  animation: highlightRowPulse 3.6s ease-in-out infinite;
}
.highlight-row td:first-child { box-shadow: inset 3px 0 0 var(--cta); }
@keyframes highlightRowPulse {
  0%, 100% { background-color: var(--highlight-row); }
  50%       { background-color: #ffef95; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}

.anim {
  opacity: 0;
  transform: translateY(28px);
}

.anim.visible {
  animation: fadeInUp 0.52s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.anim-d1 { animation-delay: 0.08s; }
.anim-d2 { animation-delay: 0.16s; }
.anim-d3 { animation-delay: 0.24s; }
.anim-d4 { animation-delay: 0.32s; }

/* ── 9. Hover / Touch Feedback ────────────────────────────────── */
@media (hover: hover) and (pointer: fine) {

  /* 9a. Framed figure — lift + yellow top glow */
  .framed-figure {
    transition:
      box-shadow 240ms cubic-bezier(0.22, 1, 0.36, 1),
      transform  240ms cubic-bezier(0.22, 1, 0.36, 1);
    position: relative;
  }
  .framed-figure::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    background: linear-gradient(to bottom, rgba(245, 200, 60, 0.35) 0%, transparent 40%);
    opacity: 0;
    transition: opacity 240ms ease;
    pointer-events: none;
    z-index: 1;
  }
  .framed-figure:hover {
    transform: translateY(-4px);
    box-shadow: 0 0 0 2px var(--bg-yellow), 0 16px 40px rgba(26, 26, 26, 0.1);
  }
  .framed-figure:hover::before { opacity: 1; }
  .framed-figure:hover figcaption { color: var(--ink); }

  /* 9b. Table row hover — warm tint + left pink rule */
  /* Must match .rows-ready specificity (2 classes) to override its transition shorthand */
  .table-wrap.rows-ready tbody tr td {
    transition:
      opacity           420ms cubic-bezier(0.22, 1, 0.36, 1),
      transform         420ms cubic-bezier(0.22, 1, 0.36, 1),
      background-color  160ms cubic-bezier(0.22, 1, 0.36, 1),
      box-shadow        180ms cubic-bezier(0.22, 1, 0.36, 1);
  }
  .table-wrap tbody tr:hover td {
    background-color: #f6ead1;
    transition-delay: 0ms; /* cancel entrance stagger on hover */
  }
  .table-wrap tbody tr:hover td:first-child {
    box-shadow: inset 3px 0 0 var(--cta);
  }

  /* 9c. Highlight row hover — pause pulse, deepen yellow, widen bar */
  .table-wrap tbody tr.highlight-row:hover td {
    animation-play-state: paused;
    background-color: #ffe566 !important;
  }
  .table-wrap tbody tr.highlight-row:hover td:first-child {
    box-shadow: inset 5px 0 0 var(--cta);
  }

  /* 9d. CTA banner button shimmer */
  .cta-banner .btn-primary {
    position: relative;
    overflow: hidden;
  }
  .cta-banner .btn-primary::before {
    content: "";
    position: absolute;
    top: 0; left: 0;
    width: 60%;
    height: 100%;
    background: linear-gradient(105deg, transparent 20%, rgba(255, 255, 255, 0.28) 50%, transparent 80%);
    transform: translateX(-140%);
    transition: transform 500ms cubic-bezier(0.22, 1, 0.36, 1);
    pointer-events: none;
  }
  .cta-banner .btn-primary:hover::before { transform: translateX(240%); }
  .cta-banner .btn-primary:hover span[aria-hidden] {
    display: inline-block;
    transform: translateX(3px);
    transition: transform 200ms ease;
  }

  /* 9e. Abstract card — lift + top gradient bar */
  .abstract-card {
    position: relative;
    overflow: hidden;
  }
  .abstract-card::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--cta), var(--bg-yellow), var(--cta));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 320ms cubic-bezier(0.22, 1, 0.36, 1);
  }
  .abstract-card:hover::before { transform: scaleX(1); }
  .abstract-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(26, 26, 26, 0.08);
  }

  /* 9g. BibTeX shell hover + focus-within */
  .bibtex-shell {
    transition: border-color 220ms ease, box-shadow 220ms ease;
  }
  .bibtex-shell:hover,
  .bibtex-shell:focus-within {
    border-color: rgba(245, 200, 60, 0.6);
    box-shadow: 0 0 0 1px rgba(245, 200, 60, 0.25), inset 0 -4px 16px rgba(245, 200, 60, 0.08);
  }

  /* 9i. Heading word hover */
  .h-word,
  .hero-word {
    display: inline-block;
    transition: transform 180ms cubic-bezier(0.22, 1, 0.36, 1), text-shadow 180ms ease;
    cursor: default;
  }
  .h-word:hover,
  .hero-word:hover {
    transform: translateY(-3px) rotate(-1deg);
    text-shadow: 0 4px 12px rgba(26, 26, 26, 0.18);
  }

  /* 9h. Nav CTA button sheen */
  .btn-nav {
    position: relative;
    overflow: hidden;
  }
  .btn-nav::before {
    content: "";
    position: absolute;
    top: -10%; left: -20%;
    width: 50%;
    height: 120%;
    background: rgba(255, 255, 255, 0.22);
    transform: skewX(-20deg) translateX(-100%);
    transition: transform 420ms cubic-bezier(0.22, 1, 0.36, 1);
    pointer-events: none;
  }
  .btn-nav:hover::before { transform: skewX(-20deg) translateX(400%); }
  .btn-nav:hover {
    box-shadow: 0 6px 20px rgba(232, 86, 122, 0.35);
  }
  .btn-nav:hover span[aria-hidden] {
    display: inline-block;
    transform: translateX(3px);
    transition: transform 200ms ease;
  }
}

/* ── 9f. Copy button states (touch-friendly, no hover guard) ─── */
.btn-copy[data-copy-state="success"] {
  background: var(--bg-yellow);
  border-color: var(--bg-yellow);
  color: var(--ink);
}
.bibtex-shell:has(.btn-copy[data-copy-state="success"]) {
  border-color: rgba(245, 200, 60, 0.8);
  box-shadow: 0 0 0 1px rgba(245, 200, 60, 0.4);
}
.btn-copy[data-copy-state="error"] {
  background: var(--cta);
  border-color: var(--cta);
  color: var(--bg-white);
}
.bibtex-shell:has(.btn-copy[data-copy-state="error"]) {
  border-color: rgba(232, 86, 122, 0.6);
  box-shadow: 0 0 0 1px rgba(232, 86, 122, 0.3);
}

/* ── 10. Logo-box distinctive hover ──────────────────────────── */
@media (hover: hover) and (pointer: fine) {
  .logo-box {
    position: relative;
    overflow: hidden;
    isolation: isolate;
    transform-origin: center center;
    will-change: transform;
    transition:
      transform 220ms cubic-bezier(0.22, 1, 0.36, 1),
      background-color 220ms cubic-bezier(0.22, 1, 0.36, 1),
      color 220ms ease,
      border-color 220ms ease,
      box-shadow 220ms cubic-bezier(0.22, 1, 0.36, 1),
      letter-spacing 220ms cubic-bezier(0.22, 1, 0.36, 1);
  }
  .logo-box::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
      linear-gradient(135deg, rgba(245, 200, 60, 0.22) 0%, rgba(245, 200, 60, 0) 52%),
      repeating-linear-gradient(-45deg, rgba(255, 255, 255, 0.08) 0 3px, transparent 3px 8px);
    opacity: 0;
    transform: scale(0.96) rotate(-1.5deg);
    transition: opacity 220ms ease, transform 220ms cubic-bezier(0.22, 1, 0.36, 1);
    pointer-events: none;
  }
  .logo-box:hover,
  .logo-box:focus-visible {
    background: var(--ink);
    color: var(--bg-cream);
    border-color: var(--bg-yellow);
    letter-spacing: 0.16em;
    transform: translateY(-3px) rotate(-1.8deg) scale(1.04);
    box-shadow:
      6px 7px 0 0 rgba(245, 200, 60, 0.95),
      0 18px 30px rgba(26, 26, 26, 0.16);
  }
  .logo-box:hover::before,
  .logo-box:focus-visible::before {
    opacity: 1;
    transform: scale(1) rotate(0deg);
  }
}

/* ── 11. Skill showcase section ──────────────────────────────── */
#skills {
  --skill-success: #7dbd93;
  --skill-success-soft: #edf7ef;
  --skill-mistake: #e8567a;
  --skill-mistake-soft: #fff0f4;
  --skill-golden: #f5c83c;
  --skill-golden-soft: #fff6d9;
  --skill-code-bg: #111111;
  --skill-code-border: rgba(255, 255, 255, 0.08);
  --skill-code-muted: rgba(245, 240, 224, 0.52);
}

.skill-section-heading { margin-bottom: 24px; }

.skill-section-intro {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}
.skill-section-intro p {
  max-width: 58rem;
  color: var(--muted);
  font-size: 1.02rem;
}

.skill-section-note {
  flex: 0 0 auto;
  display: grid;
  gap: 6px;
  min-width: 240px;
  padding: 14px 16px;
  border: 1.5px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, #fffdf7 0%, #f7f0df 100%);
  box-shadow: 5px 5px 0 rgba(245, 200, 60, 0.28);
}
.skill-section-note-label {
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.skill-section-note-text {
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

.skill-showcase {
  position: relative;
  display: grid;
  grid-template-columns: minmax(280px, 0.92fr) minmax(0, 1.08fr);
  gap: 28px;
  padding: 0;
  border: 1.5px solid var(--line);
  border-radius: 16px;
  background: linear-gradient(180deg, #fcfaf3 0%, #f6efdf 100%);
  box-shadow: 0 18px 44px rgba(26, 26, 26, 0.08);
  overflow: hidden;
}
.skill-showcase::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.56) 0%, rgba(255, 255, 255, 0) 30%),
    repeating-linear-gradient(0deg, rgba(26, 26, 26, 0.025) 0 1px, transparent 1px 30px);
  pointer-events: none;
}

.skill-field-list {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 14px;
  align-content: start;
  padding: 20px 0 20px 20px;
}

.skill-field-card {
  --skill-card-accent: var(--bg-yellow);
  --skill-card-soft: #fff8dc;
  appearance: none;
  width: 100%;
  border: 1.5px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.82);
  padding: 18px 18px 18px 20px;
  text-align: left;
  cursor: pointer;
  position: relative;
  display: grid;
  grid-template-columns: 46px 1fr;
  grid-template-areas: "symbol kicker" "symbol title" "symbol body";
  gap: 6px 14px;
  font: inherit;
  color: inherit;
  transition:
    transform 220ms cubic-bezier(0.22, 1, 0.36, 1),
    background-color 220ms ease,
    box-shadow 220ms cubic-bezier(0.22, 1, 0.36, 1),
    border-color 220ms ease;
}
.skill-field-card::before {
  content: "";
  position: absolute;
  top: 0; right: 0; left: 0;
  height: 6px;
  background: var(--skill-card-accent);
  border-radius: 14px 14px 0 0;
}
.skill-field-card-success { --skill-card-accent: var(--skill-success); --skill-card-soft: var(--skill-success-soft); }
.skill-field-card-mistake { --skill-card-accent: var(--skill-mistake); --skill-card-soft: var(--skill-mistake-soft); }
.skill-field-card-golden  { --skill-card-accent: var(--skill-golden);  --skill-card-soft: var(--skill-golden-soft);  }

.skill-field-symbol {
  grid-area: symbol;
  display: grid;
  place-items: center;
  width: 42px; height: 42px;
  margin-top: 2px;
  border: 1.5px solid var(--skill-card-accent);
  border-radius: 999px;
  background: var(--bg-white);
  color: var(--skill-card-accent);
  font-size: 1rem;
  font-weight: 800;
  line-height: 1;
}
.skill-field-kicker {
  grid-area: kicker;
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.skill-field-card h3 {
  grid-area: title;
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.15;
}
.skill-field-card h3 code {
  font-family: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.98rem;
  color: var(--ink);
  background: transparent;
}
.skill-field-card p {
  grid-area: body;
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}
.skill-field-card.is-active {
  background: var(--skill-card-soft);
  border-color: var(--skill-card-accent);
  transform: translateX(6px);
  box-shadow: 0 12px 24px rgba(26, 26, 26, 0.08);
}
.skill-field-card.is-active .skill-field-kicker { color: var(--ink); }

@media (hover: hover) and (pointer: fine) {
  .skill-field-card:hover,
  .skill-field-card:focus-visible {
    transform: translateX(4px) rotate(-0.35deg);
    box-shadow: 0 12px 24px rgba(26, 26, 26, 0.08);
  }
  .skill-field-card.is-active:hover,
  .skill-field-card.is-active:focus-visible {
    transform: translateX(6px) rotate(-0.35deg) scale(1.01);
  }
}

.skill-json-view {
  position: relative;
  z-index: 1;
  border: 1.5px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: var(--skill-code-bg);
  box-shadow: 0 18px 36px rgba(26, 26, 26, 0.18);
}
.skill-json-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  background: #0d0d0d;
  border-bottom: 1px solid var(--skill-code-border);
  transition: box-shadow 220ms ease;
}
.skill-showcase[data-active-field="success"] .skill-json-header { box-shadow: inset 0 3px 0 var(--skill-success); }
.skill-showcase[data-active-field="mistake"] .skill-json-header { box-shadow: inset 0 3px 0 var(--skill-mistake); }
.skill-showcase[data-active-field="golden"]  .skill-json-header { box-shadow: inset 0 3px 0 var(--skill-golden);  }

.skill-json-dots { display: flex; align-items: center; gap: 8px; }
.skill-json-dots span { width: 10px; height: 10px; border-radius: 999px; }
.skill-json-dots span:nth-child(1) { background: var(--cta); }
.skill-json-dots span:nth-child(2) { background: var(--bg-yellow); }
.skill-json-dots span:nth-child(3) { background: var(--bg-cream); }

.skill-json-filename {
  margin: 0;
  flex: 1 1 auto;
  color: var(--bg-cream);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.skill-json-badges {
  display: flex;
  flex: 0 0 auto;
  flex-wrap: nowrap;
  justify-content: flex-end;
  gap: 0;
}
.skill-json-badge {
  display: none;
  white-space: nowrap;
  align-items: center;
  min-height: 26px;
  padding: 4px 9px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  color: rgba(245, 240, 224, 0.76);
  font-family: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.72rem;
  line-height: 1;
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease;
}
.skill-json-badge.is-active {
  display: inline-flex;
}
.skill-json-badge-success.is-active { background: var(--skill-success); border-color: var(--skill-success); color: #102217; }
.skill-json-badge-mistake.is-active { background: var(--skill-mistake); border-color: var(--skill-mistake); color: #fff6f8; }
.skill-json-badge-golden.is-active  { background: var(--skill-golden);  border-color: var(--skill-golden);  color: #1a1a1a; }

.skill-json-lines {
  list-style: none;
  margin: 0;
  padding: 18px 0;
  counter-reset: skill-line;
  font-family: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--bg-cream);
}
.skill-json-line {
  position: relative;
  margin: 0;
  padding: 5px 18px 5px 52px;
  counter-increment: skill-line;
  white-space: normal;
  border-left: 3px solid transparent;
}
.skill-json-line::before {
  content: counter(skill-line, decimal-leading-zero);
  position: absolute;
  left: 14px; top: 5px;
  color: var(--skill-code-muted);
  font-size: 0.78rem;
}
.skill-json-field {
  transition: background-color 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}
.skill-json-field-success.is-active {
  border-left-color: var(--skill-success);
  background: linear-gradient(90deg, rgba(125, 189, 147, 0.22) 0%, rgba(125, 189, 147, 0.06) 72%, transparent 100%);
}
.skill-json-field-mistake.is-active {
  border-left-color: var(--skill-mistake);
  background: linear-gradient(90deg, rgba(232, 86, 122, 0.22) 0%, rgba(232, 86, 122, 0.06) 72%, transparent 100%);
}
.skill-json-field-golden.is-active {
  border-left-color: var(--skill-golden);
  background: linear-gradient(90deg, rgba(245, 200, 60, 0.24) 0%, rgba(245, 200, 60, 0.08) 72%, transparent 100%);
}
.skill-json-punc  { color: rgba(245, 240, 224, 0.76); }
.skill-json-key   { font-weight: 700; }
.skill-json-key-success { color: #9ae1b1; }
.skill-json-key-mistake { color: #ff97b0; }
.skill-json-key-golden  { color: #ffd85f; }
.skill-json-string { color: var(--bg-cream); }

.skill-json-footer {
  padding: 14px 18px 18px;
  border-top: 1px solid var(--skill-code-border);
}
.skill-json-caption {
  margin: 0;
  color: rgba(245, 240, 224, 0.78);
  font-size: 0.88rem;
}
.skill-json-current {
  color: var(--bg-yellow);
  font-weight: 800;
}

@media (max-width: 980px) {
  .skill-section-intro { flex-direction: column; align-items: flex-start; }
  .skill-showcase { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .skill-showcase { padding: 0; gap: 20px; }
  .skill-field-list { padding: 18px 18px 0 18px; }
  .skill-field-card { padding: 16px 16px 16px 18px; }
  .skill-field-card.is-active { transform: translateX(0); box-shadow: 0 10px 24px rgba(26,26,26,0.10); }
  .skill-json-header { flex-direction: column; align-items: flex-start; }
  .skill-json-badges { justify-content: flex-start; }
  .skill-json-line { padding: 5px 14px 5px 48px; font-size: 0.84rem; }
  .skill-json-line::before { left: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}