/* =========================================================================
   aglingael.github.io — "Decision Systems"
   A scientific specimen sheet: paper base, structural grid, one warm accent
   that marks the optimal path. See DESIGN.md for the system.
   ========================================================================= */

/* ----- Tokens ----------------------------------------------------------- */
:root {
  /* color — OKLCH, warm-tinted neutrals, single committed accent */
  --paper: oklch(0.985 0.005 80);
  --paper-2: oklch(0.965 0.008 78);
  --paper-3: oklch(0.945 0.010 76);
  --ink: oklch(0.23 0.014 55);
  --ink-soft: oklch(0.44 0.012 55);
  --ink-faint: oklch(0.556 0.010 55);
  --accent: oklch(0.572 0.16 38);
  --accent-deep: oklch(0.50 0.15 37);
  --accent-wash: oklch(0.95 0.035 60);
  --line: oklch(0.88 0.008 75);
  --line-soft: oklch(0.915 0.006 75);
  --grid: oklch(0.93 0.006 75);
  --selection: oklch(0.86 0.07 55);

  /* type */
  --display: "Bricolage Grotesque", ui-sans-serif, system-ui, sans-serif;
  --body: "Hanken Grotesk", ui-sans-serif, system-ui, sans-serif;
  --mono: "Spline Sans Mono", ui-monospace, "SFMono-Regular", monospace;

  /* fluid scale (≈1.25+) */
  --fs-mono: clamp(0.7rem, 0.66rem + 0.2vw, 0.78rem);
  --fs-sm: clamp(0.84rem, 0.8rem + 0.2vw, 0.92rem);
  --fs-base: clamp(1rem, 0.96rem + 0.22vw, 1.075rem);
  --fs-lead: clamp(1.2rem, 1.08rem + 0.6vw, 1.5rem);
  --fs-h3: clamp(1.3rem, 1.1rem + 1vw, 1.85rem);
  --fs-h2: clamp(1.9rem, 1.4rem + 2.4vw, 3rem);
  --fs-display: clamp(3.1rem, 1.6rem + 7.4vw, 8rem);

  /* rhythm */
  --pad-x: clamp(1.25rem, 5vw, 6rem);
  --maxw: 78rem;
  --measure: 64ch;
  --sec-gap: clamp(5rem, 4rem + 8vw, 9.5rem);

  /* motion */
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ease-io: cubic-bezier(0.77, 0, 0.175, 1);
}

/* ----- Reset / base ----------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--body);
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-variant-numeric: oldstyle-nums;
  overflow-x: hidden;
}

::selection { background: var(--selection); color: var(--ink); }

img, svg { display: block; max-width: 100%; }

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

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-variant-numeric: lining-nums;
}

/* ----- Structural background grid (the "specimen sheet" voice) ---------- */
.grid-field {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  display: none;
}
@media (min-width: 1000px) {
  .grid-field { display: block; }
  .grid-field::before {
    content: "";
    position: absolute;
    inset: 0;
    margin-inline: auto;
    max-width: var(--maxw);
    width: calc(100% - var(--pad-x) * 2);
    background-image:
      linear-gradient(to right, var(--grid) 0 1px, transparent 1px 100%),
      linear-gradient(to right, var(--grid) 0 1px, transparent 1px 100%);
    background-position: 0 0, 100% 0;
    background-size: 1px 100%;
    background-repeat: no-repeat;
    box-shadow:
      33.33% 0 0 -0.5px var(--grid) inset,
      66.66% 0 0 -0.5px var(--grid) inset;
  }
}

/* ----- Layout primitives ------------------------------------------------ */
.wrap {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.section { padding-block: var(--sec-gap); }
.section + .section { padding-top: 0; }

/* ----- Section header: numbered specimen index -------------------------- */
.sec-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem 1.4rem;
  align-items: baseline;
  padding-bottom: clamp(2rem, 5vw, 3.25rem);
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(2.25rem, 5vw, 3.5rem);
}
.sec-num {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.04em;
  padding-top: 0.5em;
}
.sec-title { font-size: var(--fs-h2); max-width: 22ch; }
.sec-note {
  grid-column: 2;
  color: var(--ink-soft);
  font-size: var(--fs-sm);
  max-width: 46ch;
  margin-top: 0.35rem;
}

/* ----- Site header ------------------------------------------------------ */
.site-head {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklch, var(--paper) 82%, transparent);
  backdrop-filter: blur(10px) saturate(1.1);
  -webkit-backdrop-filter: blur(10px) saturate(1.1);
  border-bottom: 1px solid transparent;
  transition: border-color 240ms var(--ease-out), background 240ms var(--ease-out);
}
.site-head[data-scrolled="true"] {
  border-bottom-color: var(--line);
  background: color-mix(in oklch, var(--paper) 90%, transparent);
}
.site-head .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 0.9rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.02rem;
}
.brand .mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.95rem;
  height: 1.95rem;
  border: 1.5px solid var(--ink);
  border-radius: 7px;
  font-size: 0.82rem;
  line-height: 1;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.brand .mark span { color: var(--accent); }
.nav {
  display: none;
  align-items: center;
  gap: clamp(1rem, 2vw, 2rem);
}
@media (min-width: 880px) { .nav { display: flex; } }
.nav a {
  font-size: var(--fs-sm);
  color: var(--ink-soft);
  position: relative;
  padding-block: 0.25rem;
  transition: color 180ms var(--ease-out);
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  width: 100%; height: 1.5px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 240ms var(--ease-out);
}
.nav a:hover { color: var(--ink); }
.nav a:hover::after { transform: scaleX(1); }
.nav .nav-num {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--accent);
  margin-right: 0.3rem;
  vertical-align: 0.15em;
}

/* ----- Buttons / links -------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--body);
  font-size: var(--fs-sm);
  font-weight: 600;
  line-height: 1;
  padding: 0.8rem 1.15rem;
  border-radius: 7px;
  border: 1.5px solid var(--ink);
  color: var(--paper);
  background: var(--ink);
  cursor: pointer;
  transition: transform 150ms var(--ease-out), background 200ms var(--ease-out),
              border-color 200ms var(--ease-out), color 200ms var(--ease-out);
}
.btn svg { width: 1.05em; height: 1.05em; }
.btn:hover { background: var(--accent); border-color: var(--accent); }
.btn:active { transform: scale(0.975); }

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

/* inline text link */
.link {
  color: var(--accent);
  text-underline-offset: 0.22em;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in oklch, var(--accent) 40%, transparent);
  transition: text-decoration-color 180ms var(--ease-out), color 180ms var(--ease-out);
}
.link:hover {
  color: var(--accent-deep);
  text-decoration-color: var(--accent);
}

/* ----- Hero ------------------------------------------------------------- */
.hero { padding-top: clamp(3rem, 6vw, 6rem); }
.hero .wrap {
  display: grid;
  gap: clamp(2.5rem, 5vw, 4rem);
  align-items: center;
}
@media (min-width: 940px) {
  .hero .wrap { grid-template-columns: 1.05fr 0.95fr; }
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 1.6rem;
}
.hero-eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-wash);
}
.hero h1 {
  font-size: var(--fs-display);
  letter-spacing: -0.045em;
  margin-bottom: 1.1rem;
}
.hero h1 .ph { color: var(--accent); }
.hero-role {
  font-family: var(--display);
  font-weight: 600;
  font-size: var(--fs-h3);
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 1.5rem;
  max-width: 18ch;
  line-height: 1.08;
}
.hero-lead {
  font-size: var(--fs-lead);
  line-height: 1.45;
  color: var(--ink-soft);
  max-width: 38ch;
  margin-bottom: 2rem;
  text-wrap: balance;
}
.hero-lead strong { color: var(--ink); font-weight: 600; }
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-bottom: 2rem;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  font-family: var(--mono);
  font-size: var(--fs-mono);
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}
.hero-meta span { display: inline-flex; align-items: center; gap: 0.5rem; }
.hero-meta .k { color: var(--accent); }

/* hero figure: the decision tree */
.hero-figure {
  position: relative;
  align-self: stretch;
  min-height: 320px;
  display: grid;
  place-items: center;
}
.tree-frame {
  width: 100%;
  max-width: 460px;
  aspect-ratio: 5 / 4.4;
  position: relative;
}
.tree-caption {
  position: absolute;
  bottom: -0.3rem; left: 0;
  font-family: var(--mono);
  font-size: 0.66rem;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
  max-width: 30ch;
  line-height: 1.5;
}
.tree-caption b { color: var(--accent); font-weight: 500; }

.tree svg { width: 100%; height: auto; overflow: visible; }
.tree .edge {
  fill: none;
  stroke: var(--line);
  stroke-width: 1.6;
}
.tree .edge.opt { stroke: var(--accent); stroke-width: 2.4; }
.tree .node-split {
  fill: var(--paper);
  stroke: var(--ink);
  stroke-width: 1.6;
}
.tree .node-split.opt { stroke: var(--accent); }
.tree .node-leaf { fill: var(--ink); }
.tree .node-leaf.opt { fill: var(--accent); }
.tree .node-leaf.opt-glow {
  filter: drop-shadow(0 0 0 transparent);
}
.tree .nlabel {
  font-family: var(--mono);
  font-size: 9px;
  fill: var(--ink-soft);
  font-weight: 500;
}
.tree .nlabel.opt { fill: var(--accent-deep); }
.tree .elabel {
  font-family: var(--mono);
  font-size: 8px;
  fill: var(--ink-faint);
}

/* ----- Ledger (highlights + experience) --------------------------------- */
.ledger { border-top: 1px solid var(--line); }
.ledger-row {
  display: grid;
  grid-template-columns: minmax(5.5rem, 8rem) 1fr;
  gap: 1rem 1.5rem;
  padding-block: clamp(1.25rem, 3vw, 1.9rem);
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
@media (min-width: 760px) {
  .ledger-row { grid-template-columns: 9rem 1fr; gap: 2.5rem; }
}
.ledger-fig {
  font-family: var(--mono);
  font-weight: 500;
  font-variant-numeric: tabular-nums lining-nums;
  font-size: clamp(1.4rem, 1rem + 1.4vw, 2.1rem);
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1;
}
.ledger-fig .u {
  font-size: 0.5em;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}
.ledger-body h3 {
  font-family: var(--body);
  font-weight: 600;
  font-size: var(--fs-base);
  letter-spacing: 0;
  margin-bottom: 0.2rem;
}
.ledger-body p {
  color: var(--ink-soft);
  font-size: var(--fs-sm);
  max-width: 60ch;
}

.xp-cluster-label {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  margin-bottom: 1.4rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}
.xp-cluster-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

/* experience ledger variant: year column + role block */
.xp-row {
  grid-template-columns: 1fr;
  gap: 0.75rem;
}
@media (min-width: 760px) {
  .xp-row { grid-template-columns: 9rem 1fr; gap: 2.5rem; }
}
.xp-year {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 500;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
  padding-top: 0.35rem;
}
.xp-year .now { color: var(--accent); }
.xp-role {
  font-family: var(--display);
  font-weight: 600;
  font-size: var(--fs-h3);
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.xp-org {
  display: block;
  font-family: var(--body);
  font-weight: 500;
  font-size: var(--fs-sm);
  color: var(--accent);
  margin-top: 0.35rem;
  letter-spacing: 0;
}
.xp-org .place { color: var(--ink-faint); }
.xp-points {
  list-style: none;
  padding: 0;
  margin-top: 1.1rem;
  display: grid;
  gap: 0.85rem;
  max-width: 64ch;
}
.xp-points li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--ink-soft);
  font-size: var(--fs-sm);
}
.xp-points li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.62em;
  width: 0.5rem; height: 0.5rem;
  border: 1.5px solid var(--accent);
  border-radius: 1px;
  transform: rotate(45deg);
}
.xp-points li b { color: var(--ink); font-weight: 600; }
.xp-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1.15rem;
}
.tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.01em;
  color: var(--ink-soft);
  padding: 0.28rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--paper-2);
}

/* ----- About ------------------------------------------------------------ */
.about-grid { display: grid; gap: clamp(2rem, 4vw, 3.5rem); }
@media (min-width: 880px) {
  .about-grid { grid-template-columns: 1.4fr 1fr; align-items: start; }
}
.about-lead {
  font-family: var(--display);
  font-weight: 600;
  font-size: var(--fs-h3);
  line-height: 1.25;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.about-lead em { font-style: normal; color: var(--accent); }
.about-body p { color: var(--ink-soft); max-width: var(--measure); }
.about-body p + p { margin-top: 1rem; }
.about-side {
  border-left: 1px solid var(--line);
  padding-left: clamp(1.25rem, 2.5vw, 2rem);
  display: grid;
  gap: 1.5rem;
  align-content: start;
}
@media (max-width: 879px) {
  .about-side { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); padding-top: 1.75rem; }
}
.about-side .blk h4 {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  margin-bottom: 0.6rem;
}
.about-side .blk p { font-size: var(--fs-sm); color: var(--ink-soft); }
.about-side .blk .big {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.hero-portrait {
  width: 116px;
  height: 116px;
  object-fit: cover;
  object-position: center 26%;
  border-radius: 20px;
  border: 1px solid var(--line);
  box-shadow: 0 16px 34px -22px oklch(0.23 0.014 55 / 0.6);
  margin-bottom: 1.6rem;
}
@media (min-width: 940px) {
  .hero-portrait { width: 128px; height: 128px; }
}

/* ----- Publications / research ------------------------------------------ */
.pub-list { display: grid; }
.pub {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem 2rem;
  padding-block: clamp(1.3rem, 3vw, 1.85rem);
  border-bottom: 1px solid var(--line);
  align-items: start;
}
.pub:first-child { border-top: 1px solid var(--line); }
@media (min-width: 760px) {
  .pub { grid-template-columns: 8.5rem 1fr auto; gap: 2.5rem; }
}
.pub-venue {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.02em;
  padding-top: 0.2rem;
}
.pub-venue .yr { color: var(--ink-faint); display: block; margin-top: 0.2rem; }
.pub-main h3 {
  font-family: var(--body);
  font-weight: 600;
  font-size: var(--fs-base);
  letter-spacing: 0;
  line-height: 1.3;
  margin-bottom: 0.3rem;
}
.pub-main .authors { font-size: var(--fs-sm); color: var(--ink-soft); }
.pub-main .authors b { color: var(--ink); font-weight: 600; }
.pub-main .note { font-size: var(--fs-sm); color: var(--ink-faint); margin-top: 0.3rem; }
.pub-cite {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-variant-numeric: tabular-nums;
  color: var(--ink-faint);
  white-space: nowrap;
  padding-top: 0.25rem;
}
.pub-cite b { color: var(--ink); font-weight: 500; }

/* ----- Projects --------------------------------------------------------- */
.projects { display: grid; gap: 1.5rem; }
@media (min-width: 820px) {
  .projects { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
}
.project {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: clamp(1.5rem, 3vw, 2rem);
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper-2);
  transition: transform 260ms var(--ease-out), border-color 260ms var(--ease-out),
              background 260ms var(--ease-out);
  overflow: hidden;
}
.project::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 360ms var(--ease-out);
}
@media (hover: hover) and (pointer: fine) {
  .project:hover { transform: translateY(-4px); border-color: var(--accent); background: var(--paper); }
  .project:hover::after { transform: scaleX(1); }
}
.project-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.1rem;
}
.project-kicker {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}
.project h3 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
  margin-bottom: 0.55rem;
}
.project p { color: var(--ink-soft); font-size: var(--fs-sm); margin-bottom: 1.25rem; }
.project .xp-tags { margin-top: auto; }
.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 1.1rem;
  font-family: var(--mono);
  font-size: var(--fs-mono);
  color: var(--accent);
  letter-spacing: 0.01em;
}
.project-link svg { width: 0.9em; height: 0.9em; transition: transform 220ms var(--ease-out); }
.project:hover .project-link svg { transform: translate(2px, -2px); }

/* ----- Skills ----------------------------------------------------------- */
.skills { display: grid; gap: clamp(1.75rem, 3vw, 2.5rem); }
@media (min-width: 760px) { .skills { grid-template-columns: repeat(2, 1fr); } }
.skill-grp h3 {
  font-family: var(--mono);
  font-size: var(--fs-mono);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  padding-bottom: 0.85rem;
  margin-bottom: 1.1rem;
  border-bottom: 1px solid var(--line);
}
.skill-grp .items { display: flex; flex-wrap: wrap; gap: 0.45rem; }

/* ----- Education -------------------------------------------------------- */
.edu-row .xp-role { font-size: var(--fs-h3); }

/* ----- Footer / contact ------------------------------------------------- */
.site-foot {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--ink);
  margin-top: var(--sec-gap);
  padding-block: clamp(3.5rem, 6vw, 6rem);
}
.foot-grid { display: grid; gap: clamp(2.5rem, 5vw, 4rem); }
@media (min-width: 820px) { .foot-grid { grid-template-columns: 1.2fr 1fr; align-items: end; } }
.foot-cta {
  font-family: var(--display);
  font-weight: 700;
  font-size: var(--fs-h2);
  letter-spacing: -0.03em;
  line-height: 1.02;
  text-wrap: balance;
}
.foot-cta a { color: var(--accent); }
.foot-cta a:hover { text-decoration: underline; text-underline-offset: 0.1em; }
.foot-links { display: grid; gap: 0.2rem; }
.foot-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: var(--fs-sm);
  transition: color 180ms var(--ease-out), padding-left 200ms var(--ease-out);
}
.foot-links a:last-child { border-bottom: 1px solid var(--line); }
.foot-links a:hover { color: var(--accent); padding-left: 0.5rem; }
.foot-links .handle { font-family: var(--mono); font-size: var(--fs-mono); color: var(--ink-faint); }
.foot-links a:hover .handle { color: var(--accent); }
.foot-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin-top: clamp(3rem, 6vw, 5rem);
  font-family: var(--mono);
  font-size: var(--fs-mono);
  color: var(--ink-faint);
  letter-spacing: 0.01em;
}

/* ----- Reveal animation ------------------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .project { transition: none; }
}

/* skip link */
.skip {
  position: absolute;
  left: -9999px;
  top: 0.5rem;
  z-index: 100;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6rem 1rem;
  border-radius: 6px;
  font-size: var(--fs-sm);
}
.skip:focus { left: 0.5rem; }

:focus-visible {
  outline: 2.5px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* sub-page (publications) heading block */
.page-head { padding-top: clamp(4rem, 8vw, 7rem); }
.page-head .back {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--mono);
  font-size: var(--fs-mono);
  color: var(--ink-soft);
  margin-bottom: 1.75rem;
  transition: color 180ms var(--ease-out), gap 180ms var(--ease-out);
}
.page-head .back:hover { color: var(--accent); gap: 0.7rem; }
.page-head h1 { font-size: clamp(2.4rem, 1.6rem + 4vw, 4.5rem); letter-spacing: -0.04em; }
.page-head p { color: var(--ink-soft); max-width: var(--measure); margin-top: 1rem; font-size: var(--fs-lead); }