/* ————————————————————————————————————————————————
   Paper — the design system of the blog.
   Soft beige paper, dark warm ink, a classic serif.
   ———————————————————————————————————————————————— */

:root {
  --paper:       #f6f1e6;
  --paper-deep:  #eee7d7;   /* slightly darker paper, for wells */
  --ink:         #2a251c;
  --ink-soft:    #6b6353;
  --ink-faint:   #a89e8a;
  --hairline:    #ddd4c2;
  --link:        #275d8f;
  --glow:        rgba(255, 252, 240, .55);
  --tip-bg:      #fffdf6;
  --good-text:   #006300;
  --bad-text:    #b03432;
  --select:      #e7d9b6;

  /* chart series — validated against the paper surface */
  --s1: #2a78d6;  /* blue    */
  --s2: #008300;  /* green   */
  --s3: #e87ba4;  /* magenta */
  --s4: #eda100;  /* yellow  */
  --s5: #1baf7a;  /* aqua    */
  --s6: #eb6834;  /* orange  */
  --s7: #4a3aa7;  /* violet  */
  --s8: #e34948;  /* red     */

  --serif: "Iowan Old Style", "Palatino Nova", Palatino, "Book Antiqua",
           "Times New Roman", Georgia, serif;
  --sans:  system-ui, -apple-system, "Segoe UI", sans-serif;

  --ease-soft: cubic-bezier(.25, .8, .25, 1);
}

/* ————— dark: the same paper, by lamplight —————
   Chart hues re-stepped for the dark surface and validated as a set. */
:root[data-theme="dark"] {
  --paper:       #1f1b14;
  --paper-deep:  #292418;
  --ink:         #eae1cd;
  --ink-soft:    #b3a88e;
  --ink-faint:   #7c7460;
  --hairline:    #3a3426;
  --link:        #7fadd6;
  --glow:        rgba(255, 240, 205, .05);
  --tip-bg:      #292418;
  --good-text:   #0ca30c;
  --bad-text:    #e66767;
  --select:      #4a3f28;

  --s1: #3987e5;
  --s2: #008300;
  --s3: #d55181;
  --s4: #c98500;
  --s5: #199e70;
  --s6: #d95926;
  --s7: #9085e9;
  --s8: #e66767;
}

/* switching language: the page drifts out of focus and settles back in */
@view-transition { navigation: auto; }
::view-transition-old(root) {
  animation: page-defocus .4s var(--ease-soft) both;
}
::view-transition-new(root) {
  animation: page-refocus .55s var(--ease-soft) both;
}
@keyframes page-defocus {
  to { opacity: 0; filter: blur(7px); }
}
@keyframes page-refocus {
  from { opacity: 0; filter: blur(7px); }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  /* the faintest paper grain */
  background-image:
    radial-gradient(ellipse 80% 60% at 50% 0%, var(--glow), transparent 70%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0.45 0 0 0 0 0.40 0 0 0 0 0.30 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)'/%3E%3C/svg%3E");
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .5s var(--ease-soft), color .5s var(--ease-soft);
}

.page {
  max-width: 41rem;
  margin: 0 auto;
  padding: 4.5rem 1.5rem 6rem;
}

a { color: var(--link); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

::selection { background: var(--select); }

/* ————— masthead ————— */

.masthead { text-align: center; margin-bottom: 4rem; }

.site-title {
  font-size: 2.9rem;
  font-weight: 500;
  letter-spacing: .01em;
  margin: 0 0 .3rem;
}

.site-tagline {
  margin: 0 0 2rem;
  color: var(--ink-soft);
  font-style: italic;
  font-size: 1.05rem;
}

.about {
  text-align: left;
  margin: 0 auto;
  max-width: 34rem;
  color: var(--ink);
  font-size: 1rem;
}

.fleuron {
  text-align: center;
  color: var(--ink-faint);
  font-size: 1.1rem;
  margin: 2.6rem 0;
  user-select: none;
}

/* ————— the little settings — handmade icons under the intro ————— */

.settings {
  display: flex;
  justify-content: center;
  gap: 1.6rem;
  margin-top: 2.2rem;
}
.setting {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  background: none;
  border: none;
  padding: .3rem .2rem;
  color: var(--ink-faint);
  cursor: pointer;
  text-decoration: none;
  font-family: var(--sans);
  font-size: .68rem;
  letter-spacing: .14em;
  transition: color .3s, transform .3s var(--ease-soft);
}
.setting:hover { color: var(--ink); transform: translateY(-1px); }
.setting svg { width: 19px; height: 19px; display: block; }

/* sun by day, moon by night — they trade places softly */
.setting .icon-sun, .setting .icon-moon {
  transition: opacity .45s var(--ease-soft), transform .45s var(--ease-soft);
}
.setting .icon-moon { position: absolute; opacity: 0; transform: rotate(-30deg) scale(.6); }
#themeToggle { position: relative; }
:root[data-theme="dark"] #themeToggle .icon-sun { opacity: 0; transform: rotate(30deg) scale(.6); }
:root[data-theme="dark"] #themeToggle .icon-moon { opacity: 1; transform: none; }

/* ————— posts ————— */

.post {
  position: relative;
  /* the card's inner space is identical open and closed,
     so nothing ever shifts when an essay unfolds */
  padding: 1.2rem 1.4rem;
  margin: 0 -1.4rem 1.6rem;
  border: 1px solid transparent;
  border-radius: 6px;
  transition: border-color .5s var(--ease-soft), background .5s var(--ease-soft),
              box-shadow .5s var(--ease-soft);
}

.post-head {
  cursor: pointer;
  outline: none;
  padding: .2rem .2rem 0;
}
.post-head:focus-visible .post-title { text-decoration: underline; text-underline-offset: 4px; }

.post time {
  font-family: var(--sans);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.post-title {
  font-size: 1.75rem;
  font-weight: 500;
  line-height: 1.25;
  margin: .35rem 0 .4rem;
  transition: color .3s;
}
.post-head:hover .post-title { color: #000; }

.post-dek {
  margin: 0;
  color: var(--ink-soft);
  font-style: italic;
  font-size: 1.02rem;
}

.post-more {
  font-family: var(--sans);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: .8rem .2rem 0;
  transition: opacity .4s, transform .4s var(--ease-soft);
}
.post-more span::after { content: " ↓"; }
.post.open .post-more { opacity: 0; transform: translateY(-4px); pointer-events: none; }
.post-head:hover ~ .post-more { color: var(--ink-soft); }

/* the expanding body — height animated by blog.js */
.post-body {
  overflow: clip;
  will-change: height;
}
.post-prose { padding: .6rem .2rem 1rem; }

.post.open {
  background: var(--glow);
  border-color: var(--hairline);
  box-shadow: 0 1px 0 rgba(0,0,0,.04), 0 12px 40px -18px rgba(0,0,0,.28);
}

/* while an essay lies open, the rest of the desk recedes —
   and a click on anything faded folds the essay away again */
.masthead, .colophon, .post {
  transition: opacity .6s var(--ease-soft), filter .6s var(--ease-soft),
              border-color .5s var(--ease-soft), background .5s var(--ease-soft),
              box-shadow .5s var(--ease-soft);
}
body.has-open .post:not(.open),
body.has-open .masthead,
body.has-open .colophon {
  opacity: .32;
  filter: saturate(.7);
}
body.has-open .post:not(.open):hover,
body.has-open .masthead:hover,
body.has-open .colophon:hover { opacity: .55; }

.post-close-wrap { text-align: center; margin-top: 3rem; }
.post-close {
  font-family: var(--sans);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  background: none;
  border: none;
  color: var(--ink-faint);
  cursor: pointer;
  padding: .5rem 1rem;
}
.post-close:hover { color: var(--ink); }

/* ————— prose ————— */

.post-prose h3 { font-size: 1.25rem; font-weight: 600; margin: 2.2rem 0 .6rem; }
.post-prose h4 { font-size: 1.05rem; font-weight: 600; margin: 1.8rem 0 .5rem; }
.post-prose p { margin: 0 0 1.1rem; }
.post-prose p:first-of-type::first-letter {
  font-size: 3.1em;
  float: left;
  line-height: .82;
  padding: .08em .12em 0 0;
  font-weight: 500;
}
.post-prose blockquote {
  margin: 1.6rem 0;
  padding: 0 1.4rem;
  border-left: 2px solid var(--hairline);
  color: var(--ink-soft);
  font-style: italic;
  font-size: 1.05em;
}
.post-prose ul, .post-prose ol { margin: 0 0 1.1rem; padding-left: 1.4rem; }
.post-prose li { margin-bottom: .35rem; }
.post-prose img { max-width: 100%; border-radius: 3px; }
.post-prose code {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: .82em;
  background: var(--paper-deep);
  padding: .1em .35em;
  border-radius: 3px;
}
.post-prose pre {
  background: var(--paper-deep);
  padding: 1rem 1.2rem;
  border-radius: 4px;
  overflow-x: auto;
  font-size: .8rem;
}

/* ————— charts (figures hydrated by ink.js) ————— */

figure.ink {
  margin: 2.4rem 0;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .9s var(--ease-soft), transform .9s var(--ease-soft);
}
figure.ink.inked { opacity: 1; transform: none; }

figure.ink figcaption {
  font-size: .85rem;
  color: var(--ink-soft);
  font-style: italic;
  margin-top: .7rem;
  text-align: center;
}

.ink-chart-frame {
  font-family: var(--sans);
}
.ink-title {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 .1rem;
  color: var(--ink);
}
.ink-subtitle {
  font-size: .78rem;
  color: var(--ink-soft);
  margin: 0 0 .8rem;
}
.ink-legend {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem 1.1rem;
  font-size: .75rem;
  color: var(--ink-soft);
  margin: 0 0 .5rem;
}
.ink-legend .key {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
}
.ink-legend .swatch {
  width: 14px; height: 4px; border-radius: 2px; display: inline-block;
}
.ink-svg { display: block; width: 100%; height: auto; }

.ink-svg text {
  font-family: var(--sans);
  font-size: 11px;
  fill: var(--ink-soft);
}
.ink-svg .tick-label { fill: var(--ink-faint); }
.ink-svg .grid { stroke: var(--hairline); stroke-width: 1; }
.ink-svg .baseline { stroke: var(--ink-faint); stroke-width: 1; }
.ink-svg .direct-label { font-size: 11px; fill: var(--ink); font-weight: 600; }

/* tooltip */
.ink-tip {
  position: fixed;
  z-index: 30;
  pointer-events: none;
  background: var(--tip-bg);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  box-shadow: 0 6px 24px -8px rgba(42,37,28,.25);
  padding: .5rem .7rem;
  font-family: var(--sans);
  font-size: .74rem;
  color: var(--ink);
  opacity: 0;
  transition: opacity .15s;
  max-width: 240px;
}
.ink-tip .tip-head { color: var(--ink-soft); margin-bottom: .25rem; }
.ink-tip .tip-row { display: flex; align-items: center; gap: .45rem; margin-top: .12rem; }
.ink-tip .tip-row .swatch { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.ink-tip .tip-row .v { margin-left: auto; font-variant-numeric: tabular-nums; padding-left: .8rem; }

/* data table (the relief channel) */
.ink-data { margin-top: .6rem; font-family: var(--sans); }
.ink-data summary {
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.ink-data summary::-webkit-details-marker { display: none; }
.ink-data summary:hover { color: var(--ink-soft); }
.ink-data table {
  width: 100%;
  border-collapse: collapse;
  font-size: .76rem;
  margin-top: .5rem;
}
.ink-data th, .ink-data td {
  text-align: right;
  padding: .3rem .5rem;
  border-bottom: 1px solid var(--hairline);
  font-variant-numeric: tabular-nums;
}
.ink-data th:first-child, .ink-data td:first-child { text-align: left; }
.ink-data th { color: var(--ink-soft); font-weight: 600; }

/* interactive widget controls */
.ink-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--sans);
  font-size: .78rem;
  color: var(--ink-soft);
  margin: .7rem 0 .3rem;
}
.ink-controls input[type="range"] {
  flex: 1;
  accent-color: var(--ink);
  height: 2px;
}
.ink-controls output {
  font-variant-numeric: tabular-nums;
  min-width: 5.5em;
  text-align: right;
  color: var(--ink);
  font-weight: 600;
}

/* stat tiles */
.ink-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: 4px;
  overflow: hidden;
}
.ink-stat {
  background: var(--paper);
  padding: .9rem 1rem;
  font-family: var(--sans);
}
.ink-stat .label { font-size: .72rem; color: var(--ink-soft); }
.ink-stat .value { font-size: 1.7rem; font-weight: 600; margin: .15rem 0 0; }
.ink-stat .delta { font-size: .72rem; margin-top: .15rem; }
.ink-stat .delta.up   { color: var(--good-text); }
.ink-stat .delta.down { color: var(--bad-text); }
.ink-stat .delta.up.bad   { color: var(--bad-text); }
.ink-stat .delta.down.good{ color: var(--good-text); }

/* ————— the timeline rail ————— */

.rail {
  position: fixed;
  left: 0; top: 0; bottom: 0;
  width: 5.2rem;
  pointer-events: none;
  z-index: 10;
  opacity: 0;
  transition: opacity .8s var(--ease-soft);
}
.rail.alive { opacity: 1; }

.rail-line {
  position: absolute;
  left: 3.4rem; top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--hairline) 15%, var(--hairline) 85%, transparent);
}

.rail-ruler {
  position: absolute;
  left: 0; top: 50%;
  width: 100%;
  will-change: transform;
}
.rail-ruler .tick {
  position: absolute;
  left: 0;
  width: 100%;
  height: 0;
  font-family: var(--sans);
}
.rail-ruler .tick::after {
  content: "";
  position: absolute;
  left: 3.05rem;
  top: 0;
  width: .7rem;
  height: 1px;
  background: var(--ink-faint);
  opacity: .5;
}
.rail-ruler .tick.year::after { width: 1.1rem; left: 2.85rem; opacity: .9; }
.rail-ruler .tick .t {
  position: absolute;
  right: 2.6rem;
  top: -.55em;
  font-size: .62rem;
  letter-spacing: .1em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
.rail-ruler .tick.year .t {
  font-size: .72rem;
  color: var(--ink-soft);
  font-weight: 600;
}
.rail-ruler .dot {
  position: absolute;
  left: calc(3.4rem - 2.5px);
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--ink-soft);
  transform: translateY(-3px);
}

.rail-now {
  position: absolute;
  left: 0; top: 50%;
  width: 100%;
  text-align: right;
  padding-right: 1.35rem;
  transform: translateY(-50%);
  font-family: var(--serif);
  display: none; /* the passing ruler carries the moment; kept for small screens */
}

@media (max-width: 1080px) {
  .rail { display: none; }
}

/* ————— footer / misc ————— */

.colophon { text-align: center; color: var(--ink-faint); font-size: .85rem; }
.colophon .fleuron { margin-bottom: 1.4rem; }
.colophon a { color: var(--ink-faint); }

.empty { text-align: center; color: var(--ink-soft); font-style: italic; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  figure.ink { opacity: 1; transform: none; transition: none; }
  * { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}