:root {
  color-scheme: dark;
  --bg: #05070a;
  --bg-soft: #091014;
  --panel: rgba(13, 20, 24, 0.72);
  --paper: #eee9df;
  --ink: #c8ceca;
  --muted: #89908c;
  --line: rgba(188, 234, 213, 0.15);
  --cyan: #78d9d7;
  --mint: #bcead5;
  --ember: #df8b61;
  --violet: #a88bd0;
  --accent: var(--cyan);
  --accent-rgb: 120, 217, 215;
  --max-width: 52rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  min-width: 280px;
  margin: 0;
  background:
    radial-gradient(circle at 82% 12%, rgba(120, 217, 215, 0.06), transparent 32rem),
    var(--bg);
  color: var(--ink);
  font-family: "Avenir Next", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--mint);
  text-decoration-color: rgba(188, 234, 213, 0.35);
  text-underline-offset: 0.18em;
}

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

.top {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  gap: 17px;
  min-height: 58px;
  padding:
    calc(10px + env(safe-area-inset-top))
    max(clamp(16px, 4vw, 42px), env(safe-area-inset-right))
    10px
    max(clamp(16px, 4vw, 42px), env(safe-area-inset-left));
  border-bottom: 1px solid var(--line);
  background: rgba(5, 7, 10, 0.76);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  backdrop-filter: blur(16px);
}

.reading-progress {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 1px;
  overflow: hidden;
  background: rgba(188, 234, 213, 0.04);
  pointer-events: none;
}

.reading-progress > span {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--accent);
  opacity: 0.68;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 80ms linear;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--paper);
  font-weight: 650;
  white-space: nowrap;
}

.brand-mark {
  position: relative;
  display: inline-block;
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  border: 1px solid rgba(188, 234, 213, 0.58);
  border-radius: 50%;
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  content: "";
  border-radius: 50%;
}

.brand-mark::before {
  inset: 5px;
  border: 1px solid rgba(223, 139, 97, 0.64);
}

.brand-mark::after {
  inset: 9px;
  background: var(--paper);
  box-shadow: 0 0 7px var(--cyan);
}

.top .spacer {
  flex: 1;
}

.top a {
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}

.top a[aria-current="page"],
.top a:hover {
  color: var(--paper);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(74px, 12vw, 148px) clamp(18px, 5vw, 44px) clamp(58px, 9vw, 100px);
  text-align: center;
}

.hero::before,
.hero::after {
  position: absolute;
  content: "";
  pointer-events: none;
}

.hero::before {
  inset: -15% -10%;
  background:
    radial-gradient(circle at 50% 30%, rgba(var(--accent-rgb), 0.19), transparent 34%),
    radial-gradient(circle at 70% 45%, rgba(223, 139, 97, 0.1), transparent 24%),
    radial-gradient(circle at 34% 52%, rgba(168, 139, 208, 0.1), transparent 24%);
  filter: blur(4px);
}

.hero::after {
  inset: 0;
  opacity: 0.52;
  background-image:
    radial-gradient(1px 1px at 17% 34%, var(--mint), transparent),
    radial-gradient(1px 1px at 28% 73%, var(--violet), transparent),
    radial-gradient(1.4px 1.4px at 42% 21%, var(--paper), transparent),
    radial-gradient(1px 1px at 58% 66%, var(--cyan), transparent),
    radial-gradient(1.3px 1.3px at 73% 25%, var(--ember), transparent),
    radial-gradient(1px 1px at 86% 63%, var(--mint), transparent),
    radial-gradient(1px 1px at 94% 38%, var(--violet), transparent);
}

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

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 15ch;
  margin: 0 auto 22px;
  color: var(--paper);
  font-size: clamp(38px, 7vw, 68px);
  font-weight: 320;
  line-height: 1.02;
  letter-spacing: -0.045em;
  text-wrap: balance;
}

.lede {
  max-width: 61ch;
  margin: 0 auto;
  color: #aeb6b1;
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.62;
  text-wrap: balance;
}

.article-contents {
  position: relative;
  z-index: 2;
  width: min(calc(100% - 36px), var(--max-width));
  margin: -28px auto 22px;
}

.article-contents details {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: rgba(8, 12, 15, 0.88);
  box-shadow: 0 14px 44px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(14px);
}

.article-contents summary {
  display: flex;
  min-height: 44px;
  align-items: center;
  gap: 18px;
  padding: 9px 15px;
  color: var(--paper);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  cursor: pointer;
  list-style: none;
}

.article-contents summary::-webkit-details-marker {
  display: none;
}

.article-contents .contents-disclosure {
  position: relative;
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
}

.article-contents .contents-disclosure::before,
.article-contents .contents-disclosure::after {
  position: absolute;
  top: 4px;
  left: 0;
  width: 10px;
  height: 1px;
  background: var(--accent);
  content: "";
}

.article-contents .contents-disclosure::after {
  transform: rotate(90deg);
  transition: opacity 150ms ease;
}

.article-contents details[open] .contents-disclosure::after {
  opacity: 0;
}

.article-contents summary small {
  overflow: hidden;
  margin-left: auto;
  color: var(--muted);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-overflow: ellipsis;
  text-transform: none;
  white-space: nowrap;
}

.article-contents ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 24px;
  margin: 0;
  padding: 4px 18px 16px 42px;
  border-top: 1px solid rgba(188, 234, 213, 0.08);
  color: var(--accent);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 10px;
  line-height: 1.45;
}

.article-contents li {
  margin: 0;
  padding: 7px 0;
}

.article-contents a {
  color: var(--muted);
  text-decoration: none;
}

.article-contents a:hover,
.article-contents a:focus-visible {
  color: var(--paper);
  outline: none;
}

main {
  width: min(100%, var(--max-width));
  margin: 0 auto;
  padding: 8px clamp(18px, 5vw, 42px) 88px;
}

section {
  padding: 40px 0;
  border-top: 1px solid rgba(188, 234, 213, 0.1);
}

section:first-child {
  border-top: 0;
}

h2 {
  margin: 0 0 10px;
  color: var(--paper);
  font-size: clamp(24px, 3.6vw, 31px);
  font-weight: 430;
  line-height: 1.2;
  letter-spacing: -0.025em;
  scroll-margin-top: 78px;
}

h2 .num {
  margin-right: 0.7em;
  color: var(--accent);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 0.56em;
  font-variant-numeric: tabular-nums;
  font-weight: 650;
  letter-spacing: 0.08em;
}

h3 {
  margin: 28px 0 6px;
  color: var(--paper);
  font-size: 19px;
  font-weight: 540;
}

p {
  margin: 15px 0;
}

strong {
  color: #e7e8df;
  font-weight: 610;
}

em {
  color: #d9d8d0;
}

ul,
ol {
  padding-left: 1.35em;
}

li {
  margin: 9px 0;
}

code {
  padding: 1px 6px;
  border-radius: 5px;
  background: rgba(223, 139, 97, 0.08);
  color: #efb08f;
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.86em;
}

var {
  font-family: Georgia, "Times New Roman", serif;
}

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

.eq,
.diagram,
.mapping {
  margin: 24px 0;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 13px;
  background: linear-gradient(145deg, rgba(var(--accent-rgb), 0.07), rgba(7, 11, 14, 0.7));
}

.eq {
  overflow-x: auto;
  padding: 19px 22px;
  color: var(--paper);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(17px, 2.4vw, 20px);
  text-align: center;
}

.eq small {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-family: "Avenir Next", "Helvetica Neue", sans-serif;
  font-size: 12px;
}

.note {
  margin: 24px 0;
  padding: 17px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--mint);
  border-radius: 13px;
  background: var(--panel);
  font-size: 15.5px;
}

.note.honesty {
  border-left-color: var(--ember);
}

.note .tag {
  display: block;
  margin-bottom: 6px;
  color: var(--mint);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.note.honesty .tag {
  color: var(--ember);
}

.note p:first-of-type {
  margin-top: 0;
}

.note p:last-child {
  margin-bottom: 0;
}

.mapping {
  display: grid;
  grid-template-columns: minmax(118px, 0.6fr) 1.4fr;
  overflow: hidden;
}

.mapping dt,
.mapping dd {
  margin: 0;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(188, 234, 213, 0.08);
}

.mapping dt {
  color: var(--paper);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mapping dd {
  color: #adb4af;
}

.mapping dt:last-of-type,
.mapping dd:last-of-type {
  border-bottom: 0;
}

.diagram {
  padding: 16px;
}

.diagram svg {
  display: block;
  width: 100%;
  height: auto;
}

.diagram figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
  text-align: center;
}

.d-box {
  fill: rgba(11, 17, 21, 0.92);
  stroke: rgba(188, 234, 213, 0.28);
}

.d-field {
  fill: rgba(120, 217, 215, 0.08);
  stroke: rgba(120, 217, 215, 0.56);
}

.d-sound {
  fill: rgba(168, 139, 208, 0.09);
  stroke: rgba(168, 139, 208, 0.56);
}

.d-render {
  fill: rgba(223, 139, 97, 0.08);
  stroke: rgba(223, 139, 97, 0.5);
}

.d-line {
  fill: none;
  stroke: rgba(188, 234, 213, 0.48);
  stroke-width: 1.5;
}

.d-title,
.d-copy {
  font-family: "Avenir Next", "Helvetica Neue", sans-serif;
  text-anchor: middle;
}

.d-title {
  fill: #eee9df;
  font-size: 14px;
  font-weight: 600;
}

.d-copy {
  fill: #89908c;
  font-size: 11px;
}

figure.code {
  margin: 24px 0;
}

figure.code figcaption {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 4px 8px;
  color: var(--muted);
  font-size: 12px;
}

figure.code .lang {
  padding: 2px 7px;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--accent);
  font-family: "SFMono-Regular", Menlo, monospace;
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

pre {
  overflow-x: auto;
  margin: 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 12px;
  background: #070a0d;
}

pre code {
  padding: 0;
  background: none;
  color: #cbd3cd;
  font-size: 13px;
  line-height: 1.62;
  white-space: pre;
}

.refs {
  color: var(--muted);
  font-size: 14px;
}

.refs cite {
  color: var(--ink);
  font-style: normal;
}

.crosslinks {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 9px;
  margin-top: 32px;
}

.crosslink {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--paper);
  font-size: 13px;
  font-weight: 560;
  text-decoration: none;
}

.crosslink:hover {
  border-color: rgba(var(--accent-rgb), 0.55);
}

footer {
  padding: 42px clamp(18px, 5vw, 42px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

footer p {
  margin: 8px 0;
}

footer a {
  color: var(--muted);
}

@media (max-width: 620px) {
  .top {
    flex-wrap: wrap;
    gap: 7px 14px;
    font-size: 10px;
  }

  .top .spacer {
    flex-basis: 100%;
    height: 0;
  }

  .hero {
    padding-top: 68px;
  }

  .article-contents {
    width: calc(100% - 32px);
    margin-top: -24px;
  }

  .article-contents summary small {
    max-width: 47vw;
  }

  .article-contents ol {
    grid-template-columns: 1fr;
  }

  .mapping {
    grid-template-columns: 1fr;
  }

  .mapping dt {
    padding-bottom: 2px;
    border-bottom: 0;
  }

  .mapping dd {
    padding-top: 4px;
  }
}

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

  .reading-progress > span {
    transition: none;
  }
}