/* --------------------------------------------------------------------------
   Berke Akyıldız — portfolio
   Limestone in shade, dark ink, and a field of deep sea at the end of every
   page. Sections are numbered and ruled so a long page can be scanned; the
   type scale stays short. A few quiet things move: leaf shade in the corner,
   light on the water, small drawings of each system at work.
   -------------------------------------------------------------------------- */

:root {
  color-scheme: light;

  /* Palette — sun-faded, never pure white. */
  --paper: #e7e0d3;
  --paper-shade: #ddd5c6;
  --ink: #1c2124;
  --ink-soft: #3a4043;
  --muted: #5d5950;
  --rule: #cdc4b3;
  --horizon: #978d7b;
  --link: #22476a;
  --sea: #1c3d63;
  --sea-ink: #ece5d7;
  --sea-muted: #a9b9c6;
  --sea-rule: rgba(236, 229, 215, 0.16);
  --clay: #b0573a;
  --clay-ink: #9a4930;
  --cypress: #5b7150;
  --selection: #c3d3d6;

  /* Limestone: a faint, still grain so the paper is not a flat screen colour. */
  --grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .3 0 0 0 0 .25 0 0 0 0 .18 0 0 0 .09 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");

  --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  /* A deliberately short scale. */
  --text: clamp(1.0625rem, 0.99rem + 0.3vw, 1.1875rem);
  --small: 0.9375rem;
  --tiny: 0.8125rem;
  --lede: clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  --h2: clamp(1.375rem, 1.18rem + 0.75vw, 1.75rem);
  --title: clamp(1.625rem, 1.35rem + 1.1vw, 2.125rem);
  --leading: 1.62;

  /* Columns: a hanging margin for labels, one reading measure. */
  --edge: 1.375rem;
  --label: 9.5rem;
  --gutter: 3.5rem;
  --measure: 37rem;

  --space-m: 3rem;
  --space-l: 5rem;
  --space-xl: 7rem;

  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

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

html {
  background: var(--paper) var(--grain);
  color: var(--ink);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  font-family: var(--serif);
  font-size: var(--text);
  line-height: var(--leading);
  font-optical-sizing: auto;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

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

p,
ul,
ol,
dl,
figure,
blockquote {
  margin: 0;
}

p,
li,
dd {
  text-wrap: pretty;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  font-size: inherit;
  line-height: 1.35;
}

/* Links: ink-blue, a hairline underline that firms up on hover. */
a {
  color: var(--link);
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  text-decoration-color: color-mix(in srgb, currentColor 32%, transparent);
  transition: text-decoration-color 180ms ease, color 180ms ease;
}

a:hover {
  text-decoration-color: currentColor;
}

a:focus-visible {
  outline: 1px solid currentColor;
  outline-offset: 3px;
  border-radius: 1px;
}

/* An arrow that leans forward when its link is pointed at. */
.go {
  display: inline-block;
  margin-left: 0.3em;
  transition: transform 220ms var(--ease);
}

a:hover .go {
  transform: translateX(3px);
}

a:hover .go.up {
  transform: translate(2px, -2px);
}

.skip {
  position: absolute;
  left: var(--edge);
  top: -3rem;
  padding: 0.4rem 0.75rem;
  background: var(--paper);
  font-size: var(--small);
  z-index: 5;
}

.skip:focus {
  top: 0.75rem;
}

.mono {
  font-family: var(--mono);
  font-size: var(--tiny);
  letter-spacing: 0.005em;
  font-weight: 400;
}

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

/* ---------------------------------------------------------------- shade -- */

/* Olive leaves between the sun and the wall: a soft shadow in the top corner. */
.shade {
  position: absolute;
  top: 0;
  right: 0;
  width: min(48vw, 640px);
  aspect-ratio: 600 / 440;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.shade::before {
  content: "";
  position: absolute;
  inset: -20% -20% 0 0;
  background: radial-gradient(closest-side at 78% 22%, rgba(255, 244, 222, 0.55), rgba(255, 244, 222, 0));
}

.shade img {
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: auto;
  mix-blend-mode: multiply;
  transform-origin: 100% 0;
}

.shade .leaf-a {
  opacity: 0.13;
  filter: blur(5px);
}

.shade .leaf-b {
  opacity: 0.09;
  filter: blur(9px);
  transform: translate(-6%, 10%) scale(0.8);
}

@media (prefers-reduced-motion: no-preference) {
  .shade .leaf-a {
    animation: sway-a 11s ease-in-out infinite alternate;
  }

  .shade .leaf-b {
    animation: sway-b 7.5s ease-in-out -3s infinite alternate;
  }
}

@keyframes sway-a {
  from {
    transform: rotate(-1.6deg);
  }
  to {
    transform: rotate(1.3deg) translate(-5px, 3px);
  }
}

@keyframes sway-b {
  from {
    transform: translate(-6%, 10%) scale(0.8) rotate(1.4deg);
  }
  to {
    transform: translate(-5%, 11%) scale(0.8) rotate(-2deg);
  }
}

/* ---------------------------------------------------------------- grid -- */

.row {
  display: grid;
  grid-template-columns:
    [full-start] minmax(var(--edge), 1fr)
    [label-start] var(--label) [label-end]
    var(--gutter)
    [main-start] minmax(0, var(--measure)) [main-end]
    minmax(var(--edge), 1.45fr) [full-end];
  align-items: baseline;
}

.row > * {
  grid-column: main;
}

.row > .label {
  grid-column: label;
}

.row > .span {
  grid-column: label-start / main-end;
  display: grid;
  grid-template-columns: subgrid;
  align-items: baseline;
}

.span > * {
  grid-column: main;
}

.span > .label {
  grid-column: label;
}

/* Margin labels: small, italic, quiet. */
.label {
  margin: 0;
  font-size: var(--small);
  font-style: italic;
  font-weight: 400;
  line-height: 1.45;
  color: var(--muted);
}

/* ------------------------------------------------------------ masthead -- */

.masthead {
  padding-top: clamp(1.75rem, 1rem + 2.5vw, 3rem);
}

.masthead .name {
  font-style: normal;
  font-size: var(--text);
  font-weight: 600;
  color: var(--ink);
}

.masthead .name a {
  color: inherit;
  text-decoration: none;
}

.masthead-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: flex-end;
  gap: 0.25rem 2rem;
}

.nav {
  display: flex;
  gap: 1.5rem;
  font-size: var(--small);
}

.nav a {
  color: var(--ink-soft);
  text-decoration-color: transparent;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--ink);
  text-decoration-color: color-mix(in srgb, currentColor 45%, transparent);
}

/* The horizon: from the margin to the edge of the screen. */
.horizon {
  grid-column: label-start / full-end !important;
  height: 1px;
  margin-top: 1.1rem;
  background: var(--horizon);
  opacity: 0.7;
  transform-origin: left center;
}

.js .horizon {
  animation: draw 1.6s var(--ease) both;
}

@keyframes draw {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

/* ---------------------------------------------------------------- opening -- */

.opening {
  padding-top: clamp(3rem, 1.6rem + 4.5vw, 5.75rem);
}

.lede {
  font-size: var(--lede);
  line-height: 1.45;
  font-weight: 400;
  letter-spacing: -0.004em;
  color: var(--ink);
}

.opening-more {
  margin-top: 1.4rem;
  color: var(--ink-soft);
}

.now {
  margin-top: 2.25rem;
  font-size: var(--small);
  color: var(--muted);
}

.now .clock {
  font-variant-numeric: tabular-nums;
}

.dot {
  display: inline-block;
  width: 0.45em;
  height: 0.45em;
  margin-right: 0.6em;
  border-radius: 50%;
  background: var(--clay);
  vertical-align: 0.1em;
}

/* ------------------------------------------------------- section heads -- */

main > section {
  margin-top: var(--space-xl);
}

/* Every section opens on its own horizon: a number in clay, a plain heading. */
.row > .sec-head {
  grid-column: label-start / full-end;
  display: grid;
  grid-template-columns: subgrid;
  align-items: baseline;
  position: relative;
  padding-top: 1.35rem;
  margin-bottom: 2.25rem;
}

.sec-head::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--horizon);
  opacity: 0.7;
  transform-origin: left center;
}

.sec-head > .num {
  grid-column: label;
  font-family: var(--mono);
  font-size: var(--tiny);
  font-style: normal;
  letter-spacing: 0.06em;
  color: var(--clay-ink);
}

.sec-head > h2 {
  grid-column: main;
  font-size: var(--h2);
  font-weight: 450;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.section-intro {
  color: var(--ink-soft);
}

/* Things that arrive as you read. Only when scripting is on; never for reduced motion. */
@media (prefers-reduced-motion: no-preference) {
  .js .reveal {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 900ms var(--ease), transform 900ms var(--ease);
  }

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

  .js .sec-head::before {
    transform: scaleX(0);
    transition: transform 1.4s var(--ease);
  }

  .js .sec-head.is-in::before {
    transform: scaleX(1);
  }
}

/* ------------------------------------------------------------------ prose -- */

.prose p + p,
.prose p + ul,
.prose p + ol,
.prose ul + p,
.prose ol + p,
.prose p + blockquote,
.prose blockquote + p {
  margin-top: 1em;
}

.prose h3 {
  position: relative;
  margin-top: 2.75rem;
  font-size: calc(var(--text) * 1.06);
  font-weight: 600;
  color: var(--ink);
}

/* A small clay tick in the gutter marks each subsection. */
.prose h3::before {
  content: "";
  position: absolute;
  left: -1.7rem;
  top: 0.78em;
  width: 0.85rem;
  height: 1px;
  background: var(--clay);
}

.sec-head + h3 {
  margin-top: 0;
}

.prose h3 + .inline-pairs {
  margin-top: 0.6rem;
}

.prose h3 + p,
.prose h3 + ul,
.prose h3 + ol,
.prose h3 + .table {
  margin-top: 0.45rem;
}

.prose ul,
.prose ol {
  padding: 0;
  list-style: none;
}

.prose li {
  position: relative;
}

.prose li + li {
  margin-top: 0.45rem;
}

.prose ul > li::before {
  content: "\2013";
  position: absolute;
  left: -1.15em;
  color: var(--muted);
}

.prose ol {
  counter-reset: step;
}

.prose ol > li {
  counter-increment: step;
}

.prose ol > li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: -2.1rem;
  top: 0.3em;
  font-family: var(--mono);
  font-size: var(--tiny);
  line-height: 1.4;
  color: var(--clay-ink);
}

.prose strong {
  font-weight: 600;
  color: var(--ink);
}

code {
  font-family: var(--mono);
  font-size: 0.82em;
  letter-spacing: 0;
}

.further {
  margin-top: 1.75rem !important;
  font-size: var(--small);
}

.principles > li,
.themes > li {
  color: var(--ink-soft);
}

.principles > li + li,
.themes > li + li {
  margin-top: 1.3rem;
}

.key {
  margin-right: 0.6em;
  font-size: var(--small);
  font-style: italic;
  color: var(--muted);
}

/* "Karşılığı: …" — the quiet cross-reference under a principle or theme. */
.ref {
  display: block;
  margin-top: 0.3rem;
  font-size: var(--small);
}

/* ------------------------------------------------------------------ work -- */

.entry {
  padding-block: 1.9rem 2.1rem;
  border-top: 1px solid var(--rule);
}

.section-intro + .entry {
  margin-top: 2.25rem;
}

.entry:last-child {
  border-bottom: 1px solid var(--rule);
}

.entry h3 {
  font-size: calc(var(--text) * 1.1);
  font-weight: 600;
  line-height: 1.35;
}

.entry h3 a {
  color: var(--ink);
  text-decoration-color: transparent;
}

.entry h3 a:hover {
  text-decoration-color: color-mix(in srgb, currentColor 45%, transparent);
}

.entry .summary {
  margin-top: 0.4rem;
  color: var(--ink-soft);
}

.entry .decision {
  margin-top: 0.6rem;
  color: var(--ink);
}

.entry .stack {
  margin-top: 1rem;
  color: var(--muted);
}

.entry .more {
  margin-top: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  font-size: var(--small);
}

/* The lead entry: the project to see first carries its figures on the home page. */
.entry-lead h3 {
  font-size: var(--h2);
}

/* On the home page the figures sit under the title, so they stay below it in size;
   the full scale belongs to the project page, where they head a section. */
.entry-lead .figures {
  gap: 1rem 1.5rem;
  margin-top: 1.2rem;
}

.entry-lead .figures > div {
  padding-top: 0.6rem;
}

.entry-lead .figures dd {
  font-size: var(--lede);
  letter-spacing: -0.01em;
}

.entry-lead .figures dt {
  margin-top: 0.3rem;
  font-size: var(--tiny);
}

/* ------------------------------------------------------------------ deck -- */
/* A project's screenshots, beside its title: one in front, two behind, the rest waiting. */

.doc-head > .deck {
  grid-column: main-end / full-end;
  grid-row: 1;
  align-self: start;
  width: min(100% - var(--edge) - 2.5rem, 17rem);
  margin-left: 2.5rem;
}

.deck-cards {
  position: relative;
  aspect-ratio: 5 / 3;
}

.deck .shot {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 76%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--paper-shade);
  border: 3px solid #f1ece2;
  border-radius: 3px;
  box-shadow: 0 1px 0 rgba(28, 33, 36, 0.05), 0 12px 24px -16px rgba(28, 33, 36, 0.55);
  transform-origin: left bottom;
  transition: transform 700ms var(--ease), filter 700ms var(--ease), opacity 700ms var(--ease);
}

.deck .shot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top left;
}

.deck .shot[data-pos="0"] {
  z-index: 3;
  cursor: zoom-in;
}

.deck .shot[data-pos="1"] {
  z-index: 2;
  transform: translate(15%, -15%) scale(0.9);
  filter: blur(1.2px) saturate(0.7);
  opacity: 0.8;
  cursor: pointer;
}

.deck .shot[data-pos="2"] {
  z-index: 1;
  transform: translate(28%, -28%) scale(0.8);
  filter: blur(2.5px) saturate(0.5);
  opacity: 0.5;
  cursor: pointer;
}

.deck .shot[data-pos="3"] {
  z-index: 0;
  transform: translate(38%, -38%) scale(0.72);
  filter: blur(4px);
  opacity: 0;
  pointer-events: none;
}

.deck .shot[data-pos="0"]:hover,
.deck .shot[data-pos="0"]:focus-visible {
  transform: translateY(-2px);
}

/* The film: a play mark on its card. */
.deck .shot-film::before {
  content: "";
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 50%;
  width: 2.6rem;
  height: 2.6rem;
  margin: -1.3rem 0 0 -1.3rem;
  border-radius: 50%;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  box-shadow: 0 4px 18px -6px rgba(0, 0, 0, 0.6);
  transition: transform 300ms var(--ease);
}

.deck .shot-film::after {
  content: "";
  position: absolute;
  z-index: 2;
  top: 50%;
  left: 50%;
  margin: -0.45rem 0 0 -0.22rem;
  border-style: solid;
  border-width: 0.45rem 0 0.45rem 0.72rem;
  border-color: transparent transparent transparent var(--ink);
}

.deck .shot-film:hover::before {
  transform: scale(1.1);
}

.deck .shot-film:not([data-pos="0"])::before,
.deck .shot-film:not([data-pos="0"])::after {
  opacity: 0;
}

.deck .shot:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
}

.deck-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0.7rem 0 0;
  font-family: var(--mono);
  font-size: var(--tiny);
  color: var(--muted);
}

.deck-bar button {
  font: inherit;
  line-height: 1;
  color: var(--ink-soft);
  background: none;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.3rem 0.6rem;
  cursor: pointer;
}

.deck-bar button:hover,
.deck-bar button:focus-visible {
  border-color: var(--horizon);
  color: var(--ink);
}

.deck-count {
  min-width: 3.2em;
  text-align: center;
}

/* Too narrow for the margin: the deck comes under the standfirst. */
@media (max-width: 73.99rem) {
  .doc-head > .deck {
    grid-column: main;
    grid-row: auto;
    width: min(100%, 17rem);
    margin: 1.8rem 0 0;
  }
}

/* ------------------------------------------------------------- viewer -- */

.viewer {
  width: 100vw;
  max-width: none;
  height: 100dvh;
  max-height: none;
  margin: 0;
  padding: 0;
  border: 0;
  background: rgba(20, 25, 28, 0.94);
  color: var(--sea-ink);
  overscroll-behavior: contain;
}

.viewer::backdrop {
  background: transparent;
}

.viewer[open] {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
}

.viewer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem var(--edge);
  font-family: var(--mono);
  font-size: var(--tiny);
  color: var(--sea-muted);
}

.viewer-stage {
  display: grid;
  place-items: center;
  min-height: 0;
  overflow: hidden;
  padding: 0 clamp(0.5rem, 4vw, 4.5rem);
}

.viewer-stage img,
.viewer-stage video {
  max-width: 100%;
  max-height: calc(100dvh - 9rem);
  object-fit: contain;
  border-radius: 3px;
  box-shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.7);
  background: #111;
}

.viewer-caption {
  margin: 0 auto;
  padding: 0.9rem var(--edge) 1.3rem;
  max-width: 48rem;
  min-height: 1.5em;
  text-align: center;
  font-size: var(--small);
  color: var(--sea-ink);
}

.viewer button {
  font: inherit;
  color: inherit;
  background: none;
  border: 1px solid var(--sea-rule);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  cursor: pointer;
}

.viewer button:hover,
.viewer button:focus-visible {
  border-color: var(--sea-muted);
  color: var(--sea-ink);
}

.viewer-nav {
  display: flex;
  gap: 0.5rem;
}

.viewer-nav[hidden] {
  display: none;
}

@media (prefers-reduced-motion: no-preference) {
  .viewer[open] .viewer-stage > * {
    animation: viewer-in 260ms var(--ease);
  }
}

@keyframes viewer-in {
  from {
    opacity: 0;
    transform: scale(0.985);
  }
}

/* Status: running systems breathe, a paused one keeps still. */
.status {
  display: flex;
  align-items: baseline;
  gap: 0.55em;
}

.state {
  flex: none;
  width: 0.5em;
  height: 0.5em;
  border-radius: 50%;
  transform: translateY(-0.05em);
}

.state.run {
  background: var(--cypress);
}

.state.pause {
  border: 1px solid var(--muted);
}

.state.early {
  background: var(--horizon);
}

@media (prefers-reduced-motion: no-preference) {
  .state.run {
    animation: breathe 3.4s ease-in-out infinite;
  }
}

@keyframes breathe {
  0%,
  100% {
    opacity: 1;
    box-shadow: 0 0 0 0 color-mix(in srgb, var(--cypress) 45%, transparent);
  }
  50% {
    opacity: 0.55;
    box-shadow: 0 0 0 0.3em color-mix(in srgb, var(--cypress) 0%, transparent);
  }
}

/* --------------------------------------------------------------- glyphs -- */

/* A small drawing of how each system is built, from its own documentation. */
.glyph {
  display: block;
  width: 100%;
  max-width: 8.75rem;
  height: auto;
  margin-top: 1.15rem;
  overflow: visible;
}

.glyph .ln {
  fill: none;
  stroke: var(--horizon);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.glyph .ln.faint {
  stroke-dasharray: 2 3;
}

.glyph .nd {
  fill: var(--paper);
  stroke: var(--ink-soft);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.glyph .nd.solid {
  fill: var(--ink-soft);
}

.glyph .pk {
  fill: var(--clay);
}

.glyph .win {
  fill: none;
  stroke: var(--ink-soft);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.glyph-caption {
  margin-top: 0.45rem;
  font-size: 0.78rem;
  line-height: 1.4;
  font-style: italic;
  color: var(--muted);
}

/* ----------------------------------------------------------------- pairs -- */

/* Plain two-column lists: a term in the margin, its value on the measure. */
.pairs {
  display: grid;
  grid-template-columns: subgrid;
  grid-column: label-start / main-end;
  row-gap: 0.55rem;
  align-items: baseline;
}

.pairs dt {
  grid-column: label;
  font-size: var(--small);
  font-style: italic;
  color: var(--muted);
}

.pairs dd {
  grid-column: main;
  margin: 0;
}

.pairs dd.mono {
  line-height: 1.9;
}

.pairs dd.source {
  font-size: var(--small);
  color: var(--muted);
}

.head-meta .glyph {
  max-width: 9.5rem;
  margin-top: 1.5rem;
}

.inline-pairs {
  display: grid;
  grid-template-columns: 8.5rem minmax(0, 1fr);
  gap: 0.65rem 1.5rem;
  align-items: baseline;
}

.inline-pairs dt {
  font-size: var(--small);
  font-style: italic;
  color: var(--muted);
}

.inline-pairs dd {
  margin: 0;
}

/* ------------------------------------------------------------- documents -- */

.doc-head {
  padding-top: clamp(3rem, 1.6rem + 4.5vw, 5.75rem);
}

.doc-head h1 {
  font-size: var(--title);
  font-weight: 450;
  line-height: 1.18;
  letter-spacing: -0.012em;
  text-wrap: balance;
}

.doc-head .standfirst {
  margin-top: 1rem;
  font-size: var(--lede);
  line-height: 1.45;
  font-weight: 400;
  color: var(--ink-soft);
  text-wrap: pretty;
}

.doc-facts {
  margin-top: var(--space-l);
}

.doc > section {
  margin-top: var(--space-xl);
}

/* The brief: a recess in the stone, four questions answered in four lines. */
.brief > .slab {
  position: relative;
  isolation: isolate;
  padding-block: 2.25rem;
}

.brief > .slab::before {
  content: "";
  position: absolute;
  inset: 0 -2.25rem;
  z-index: -1;
  background: var(--paper-shade) var(--grain);
  border-radius: 2px;
}

.brief .pairs {
  row-gap: 1.35rem;
}

.brief .pairs dt {
  color: var(--ink-soft);
}

.prose .meta-line {
  margin-top: 0.15rem;
  font-size: var(--small);
  color: var(--muted);
}

/* A thesis line that opens a section: the lede's size, the text's voice. */
.prose .pull {
  font-size: var(--lede);
  line-height: 1.42;
  color: var(--ink);
  text-wrap: balance;
}

.prose .pull + p {
  margin-top: 1.25rem;
}

/* "Yakından": the project told as a story, each chapter's kicker in the margin. */
.chapter {
  margin-top: 2.9rem;
}

.chapter > .label {
  padding-right: 1rem;
}

.prose .chapter > h3 {
  margin-top: 0;
}

/* Measured numbers: few, large enough to find, each drawn in on its own rule. */
.figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 1.4rem 1.75rem;
  margin: 1.6rem 0 0;
}

.prose h3 + .figures {
  margin-top: 1.1rem;
}

.prose .figures + p {
  margin-top: 1.6rem;
}

.figures > div {
  position: relative;
  display: flex;
  flex-direction: column-reverse;
  justify-content: flex-end;
  padding-top: 0.8rem;
}

.figures > div::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--clay);
  opacity: 0.55;
  transform-origin: left center;
}

.figures dd {
  margin: 0;
  font-size: calc(var(--h2) * 1.2);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.015em;
  font-variant-numeric: lining-nums;
  color: var(--sea);
}

.figures .unit {
  margin-left: 0.14em;
  font-size: 0.58em;
  letter-spacing: 0;
  color: var(--muted);
}

.figures dt {
  margin-top: 0.45rem;
  font-size: var(--small);
  font-style: italic;
  line-height: 1.4;
  color: var(--muted);
}

@media (prefers-reduced-motion: no-preference) {
  .js .figures > div::before {
    transform: scaleX(0);
    transition: transform 1.1s var(--ease);
  }

  .js .figures.is-in > div::before {
    transform: scaleX(1);
  }

  .js .figures > div:nth-child(2)::before {
    transition-delay: 160ms;
  }

  .js .figures > div:nth-child(3)::before {
    transition-delay: 320ms;
  }
}

/* The threshold between the story and the architecture: a band of shade, full width. */
.part-note-row {
  margin-top: var(--space-xl);
  padding-block: 1.45rem 1.55rem;
  background: var(--paper-shade) var(--grain);
}

.part-note-row > .label {
  font-family: var(--mono);
  font-size: var(--tiny);
  font-style: normal;
  letter-spacing: 0.06em;
  color: var(--clay-ink);
}

.part-note {
  font-size: var(--small);
  font-style: italic;
  line-height: 1.5;
  color: var(--ink-soft);
}

.doc > .part-note-row + section {
  margin-top: var(--space-l);
}

/* Lists whose items open on a bold phrase need air between them. */
.prose .leads > li + li {
  margin-top: 0.95rem;
}

/* CV: four projects, each a name, its stack in mono, a sentence or two, two links. */
.cv-projects > li + li {
  margin-top: 1.5rem;
}

.cv-projects strong {
  display: block;
}

.cv-stack {
  display: block;
  margin: 0.2rem 0 0.35rem;
  font-family: var(--mono);
  font-size: var(--tiny);
  color: var(--muted);
}

.cv-links {
  display: block;
  margin-top: 0.4rem;
  font-size: var(--small);
}

/* Dates and hyphenated names break badly at their hyphen. */
.nw {
  white-space: nowrap;
}

.doc-next {
  margin-top: var(--space-xl);
  font-size: var(--small);
}

.doc-next .more {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--rule);
}

/* Figures and tables may leave the measure and lean into the open right margin. */
.row > .wide {
  grid-column: main-start / full-end;
  max-width: 52rem;
  padding-right: var(--edge);
}

.prose figure,
.prose .table {
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

.prose figure + p,
.prose .table + p,
.prose figure + h3,
.prose .table + h3,
.prose figure + ul,
.prose .table + ul,
.prose .table + .table {
  margin-top: 1.75rem;
}

figure pre {
  margin: 0;
  padding: 1.35rem 1.5rem;
  overflow-x: auto;
  /* System monospace here: its box-drawing glyphs share one cell width, so diagrams line up. */
  font-family: ui-monospace, "SF Mono", Menlo, "Cascadia Mono", Consolas, "DejaVu Sans Mono", monospace;
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--ink-soft);
  background: var(--paper-shade);
  border-radius: 2px;
  tab-size: 2;
}

figcaption {
  margin-top: 0.6rem;
  font-size: var(--small);
  font-style: italic;
  color: var(--muted);
}

.table {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--small);
  line-height: 1.5;
  font-variant-numeric: tabular-nums;
}

caption {
  padding-bottom: 0.6rem;
  text-align: left;
  font-style: italic;
  color: var(--ink-soft);
}

th {
  padding: 0 1.25rem 0.55rem 0;
  text-align: left;
  font-weight: 400;
  font-style: italic;
  color: var(--muted);
  border-bottom: 1px solid var(--horizon);
  vertical-align: bottom;
}

td {
  padding: 0.6rem 1.25rem 0.6rem 0;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

th:last-child,
td:last-child {
  padding-right: 0;
}

tbody th {
  padding-top: 0.6rem;
  font-style: normal;
  color: var(--ink);
  border-bottom-color: var(--rule);
  vertical-align: top;
}

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

blockquote {
  padding-left: 1.25rem;
  border-left: 1px solid var(--clay);
  font-style: italic;
  color: var(--ink-soft);
}

/* ------------------------------------------------------------------ arch -- */
/* How a system works: the system drawn once, and a few real scenarios played
   over it. A clay dot carries a request, a sea-blue one the answer; a part lights
   when something reaches it and its small line says what happened there. Without
   scripting it is a still drawing and a numbered list. */

.arch {
  container-type: inline-size;
  --lit: #ede7dc;
}

.prose .sec-head + .arch {
  margin-top: 0;
}

.arch-body {
  display: grid;
  gap: 1.75rem;
}

.arch-map {
  display: block;
  width: 100%;
  max-width: 26.25rem;
  height: auto;
  margin-inline: auto;
  overflow: visible;
}

.arch-map text {
  font-family: var(--serif);
  fill: var(--ink);
}

.arch-map .nm {
  font-size: 15px;
  font-weight: 500;
}

.arch-map .sub {
  font-family: var(--mono);
  font-size: 10.5px;
  fill: var(--muted);
  transition: fill 400ms ease;
}

.arch-map .sub.is-state {
  fill: var(--clay-ink);
}

.arch-map .zone {
  fill: var(--paper-shade);
}

.arch-map .border {
  fill: none;
  stroke: var(--horizon);
  stroke-width: 1;
  stroke-dasharray: 3 4;
}

.arch-map .zone-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  fill: var(--clay-ink);
}

.arch-map .edge {
  fill: none;
  stroke: var(--horizon);
  stroke-opacity: 0.55;
  stroke-width: 1;
}

.arch-map .edge.ghost {
  stroke: var(--clay);
  stroke-opacity: 0.7;
  stroke-dasharray: 2 4;
  opacity: 0;
  transition: opacity 500ms ease;
}

.arch-map .edge.ghost.is-shown {
  opacity: 1;
}

.arch-map .edge-label {
  font-family: var(--mono);
  font-size: 9.5px;
  fill: var(--muted);
}

.arch-map .box,
.arch-map .person {
  fill: var(--lit);
  stroke: var(--horizon);
  stroke-width: 1;
  transition: stroke 500ms ease, fill 500ms ease;
}

.arch-map .person {
  stroke: var(--ink-soft);
}

.arch-map .is-seen .box {
  stroke: var(--ink-soft);
}

.arch-map .is-now .box,
.arch-map .is-now .person {
  stroke: var(--ink);
  fill: color-mix(in srgb, var(--clay) 9%, var(--lit));
}

.arch-map .halo {
  fill: none;
  stroke: var(--clay);
  stroke-width: 1;
  opacity: 0;
  transform-box: fill-box;
  transform-origin: center;
}

.arch-map .trail {
  fill: none;
  stroke: var(--ink-soft);
  stroke-width: 1.5;
  transition: stroke-opacity 900ms ease;
}

.arch-map .trail.reply {
  stroke: var(--sea);
}

.arch-map .trail.old {
  stroke-opacity: 0.45;
}

.arch-map .no {
  fill: none;
  stroke: var(--clay-ink);
  stroke-width: 1.75;
  stroke-linecap: round;
}

.arch-map .pk {
  opacity: 0;
  transition: opacity 250ms ease;
}

.arch-map .pk circle {
  fill: var(--clay);
}

.arch-map .pk circle:first-child {
  fill-opacity: 0.2;
}

.arch-map .pk.reply circle {
  fill: var(--sea);
}

.arch-map .arch-trails,
.arch-map .arch-marks {
  transition: opacity 450ms ease;
}

.arch-map.is-clearing .arch-trails,
.arch-map.is-clearing .arch-marks {
  opacity: 0;
}

/* The panel: scenario names, the steps of the one playing, and its controls. */
.arch-panel {
  font-size: var(--small);
  line-height: 1.5;
}

.arch-scene-name {
  margin: 1.25rem 0 0.4rem;
  font-style: italic;
  color: var(--muted);
}

.arch-scene:first-child .arch-scene-name {
  margin-top: 0;
}

.js .arch-scene-name {
  display: none;
}

.prose .arch-steps > li {
  position: relative;
  padding: 0.5rem 0 0.6rem 2.1rem;
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
  transition: color 400ms ease;
}

.prose .arch-steps > li + li {
  margin-top: 0;
}

.prose .arch-steps > li::before {
  left: 0;
  top: 0.78rem;
  transition: color 400ms ease;
}

/* The step playing fills a hairline as it is read. */
.arch-steps > li::after {
  content: "";
  position: absolute;
  left: 2.1rem;
  right: 0;
  bottom: -1px;
  z-index: 1;
  height: 1px;
  background: var(--clay);
  transform: scaleX(var(--p, 0));
  transform-origin: left center;
  opacity: 0;
}

.js .prose .arch-steps > li {
  color: var(--muted);
}

.js .prose .arch-steps > li.is-done {
  color: var(--ink-soft);
}

.js .prose .arch-steps > li.is-on {
  color: var(--ink);
}

.js .arch-steps > li.is-on::after {
  opacity: 0.75;
}

/* Numbered by the script: a counter would skip the steps hidden on narrow screens. */
.js .prose .arch-steps > li::before {
  content: attr(data-n);
}

.js .prose .arch-steps > li:not(.is-on)::before {
  color: var(--muted);
}

.arch-step {
  display: block;
  width: 100%;
  padding: 0;
  font: inherit;
  line-height: inherit;
  text-align: left;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

.arch-step:focus-visible {
  outline: 1px solid var(--link);
  outline-offset: 3px;
}

.arch-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.arch-tabs button,
.arch-controls button {
  font-family: var(--mono);
  font-size: var(--tiny);
  line-height: 1;
  color: var(--ink-soft);
  background: none;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  transition: border-color 200ms ease, color 200ms ease, background-color 200ms ease;
}

.arch-tabs button:hover,
.arch-tabs button:focus-visible,
.arch-controls button:hover,
.arch-controls button:focus-visible {
  border-color: var(--horizon);
  color: var(--ink);
}

.arch-tabs button[aria-pressed="true"] {
  border-color: var(--ink-soft);
  color: var(--ink);
  background: var(--lit);
}

.arch-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1rem;
  font-family: var(--mono);
  font-size: var(--tiny);
  color: var(--muted);
}

.arch-controls [data-act="toggle"] {
  min-width: 5.6rem;
}

.arch-controls button:disabled {
  opacity: 0.35;
  cursor: default;
}

.arch-controls button[hidden] {
  display: none;
}

.arch-count {
  min-width: 3.2em;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.arch-key {
  display: inline-block;
  width: 0.5em;
  height: 0.5em;
  margin: 0 0.35em 0 0.15em;
  border-radius: 50%;
  background: var(--clay);
  vertical-align: 0.08em;
}

.arch-key.reply {
  background: var(--sea);
}

/* Room for both: the drawing on the left, its story beside it. */
@container (min-width: 46rem) {
  .arch-body {
    grid-template-columns: 26.25rem minmax(0, 1fr);
    gap: 2.75rem;
    align-items: start;
  }
}

/* No room: one step at a time, under the drawing. */
@container (max-width: 45.99rem) {
  .arch-map {
    margin-inline: 0;
  }

  .arch-panel {
    max-width: 30rem;
  }

  .js .prose .arch-steps > li:not(.is-on) {
    display: none;
  }

  .js .prose .arch-steps > li {
    min-height: 5.6rem;
  }
}

/* A phone draws the system smaller; its small lines grow to stay readable. */
@container (max-width: 30rem) {
  .arch-map .sub {
    font-size: 11.5px;
  }

  .arch-map .zone-label,
  .arch-map .edge-label {
    font-size: 11px;
  }
}

/* ------------------------------------------------------------------- sea -- */

/* Every page ends at the water. Light moves on it, slowly. */
.sea {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  margin-top: var(--space-xl);
  background: var(--sea) var(--grain);
  color: var(--sea-ink);
  min-height: min(40rem, 72svh);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-l);
  padding-top: var(--space-l);
  padding-bottom: 1.75rem;
}

.caustics {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  opacity: 0;
  transition: opacity 2s ease;
}

.caustics.on {
  opacity: 1;
}

.sea a {
  color: var(--sea-ink);
  text-decoration-color: color-mix(in srgb, currentColor 35%, transparent);
}

.sea a:hover {
  text-decoration-color: currentColor;
}

.sea .label,
.sea .muted {
  color: var(--sea-muted);
}

.sea .lede {
  color: var(--sea-ink);
}

.sea-note {
  margin-top: 1.1rem;
  color: var(--sea-muted);
}

.contact {
  margin-top: var(--space-m);
}

.sea .pairs dt {
  color: var(--sea-muted);
}

.colophon {
  font-size: var(--tiny);
  line-height: 1.5;
  color: var(--sea-muted);
}

.colophon-line {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.25rem 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--sea-rule);
}

/* ---------------------------------------------------------------- narrow -- */

@media (max-width: 55.99rem) {
  :root {
    --space-l: 3.75rem;
    --space-xl: 5rem;
  }

  .row {
    grid-template-columns:
      [full-start] var(--edge)
      [label-start main-start] minmax(0, 1fr) [label-end main-end]
      var(--edge) [full-end];
  }

  .row > .label,
  .span > .label {
    margin-bottom: 0.6rem;
  }

  .row > .sec-head {
    margin-bottom: 1.5rem;
  }

  .sec-head > .num {
    margin-bottom: 0.35rem;
  }

  .masthead-line {
    flex-direction: column;
    gap: 0.6rem;
  }

  .shade {
    width: 88vw;
  }

  .shade .leaf-a {
    opacity: 0.1;
  }

  .pairs {
    row-gap: 0;
  }

  .pairs dd + dt {
    margin-top: 0.8rem;
  }

  .pairs dt {
    margin-bottom: 0.1rem;
  }

  .brief .pairs dd + dt {
    margin-top: 1.4rem;
  }

  .brief > .slab::before {
    inset: 0 -1rem;
  }

  .inline-pairs {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .inline-pairs dd + dt {
    margin-top: 0.8rem;
  }

  .prose ol > li {
    padding-left: 2rem;
  }

  .prose ol > li::before {
    left: 0;
  }

  .prose h3::before {
    left: -1.1rem;
    width: 0.6rem;
  }

  .glyph {
    max-width: 8rem;
    margin-top: 0.8rem;
  }

  .row > .head-meta {
    margin-bottom: 1.6rem;
  }

  .wide table {
    min-width: 34rem;
  }

  /* Two figures to a row; an odd last one takes the whole row. */
  .figures {
    grid-template-columns: 1fr 1fr;
  }

  .figures > div:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }
}

@media print {
  html,
  .sea {
    background: none;
    color: #000;
  }

  .shade,
  .caustics,
  .nav,
  .skip {
    display: none;
  }

  .sea a,
  .sea .label,
  .sea .muted,
  .colophon {
    color: #000;
  }
}