:root {
  color-scheme: light;
  --paper: #f2f0e9;
  --paper-2: #e9e6dd;
  --raised: #fbfaf6;
  --ink: #102018;
  --muted: #59645e;
  --faint: #89918c;
  --line: #d1d3ca;
  --line-strong: #a5ada6;
  --green: #157554;
  --green-bright: #61e2a7;
  --night: #07150f;
  --night-2: #10231a;
  --orange: #df7b43;
  --shadow: 0 28px 70px rgba(25, 34, 29, 0.14);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #09140f;
  --paper-2: #0d1b14;
  --raised: #112219;
  --ink: #f0f1eb;
  --muted: #a7b4ad;
  --faint: #718078;
  --line: #263a30;
  --line-strong: #465d51;
  --green: #61e2a7;
  --night: #050c09;
  --night-2: #10231a;
  --shadow: 0 28px 70px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  min-width: 320px;
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  transition:
    background-color 180ms ease,
    color 180ms ease;
}

a {
  color: inherit;
  text-decoration: none;
}
button {
  font: inherit;
}
img,
video,
svg {
  display: block;
  max-width: 100%;
}
:focus-visible {
  outline: 3px solid #2785d1;
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  transform: translateY(-160%);
  background: var(--ink);
  color: var(--paper);
  padding: 9px 13px;
  font-weight: 800;
}
.skip-link:focus {
  transform: translateY(0);
}

.read-progress {
  position: fixed;
  z-index: 60;
  inset: 0 0 auto;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--green-bright);
}

.site-nav {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 82%, transparent);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(16px);
}
.nav-inner {
  width: min(100% - 48px, 1360px);
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin: auto;
}
.nav-actions,
.personal-links {
  display: flex;
  align-items: center;
}
.brand {
  flex: none;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 21px;
  font-weight: 400;
  letter-spacing: -0.055em;
}
.nav-actions {
  gap: clamp(18px, 3vw, 36px);
}
.personal-links {
  gap: clamp(14px, 2.2vw, 28px);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.9rem;
}
.personal-links a {
  text-underline-offset: 0.25rem;
}
.personal-links a:hover,
.personal-links a:focus-visible {
  text-decoration: underline;
}
.theme-toggle {
  min-height: 35px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  background: transparent;
  color: var(--ink);
  padding: 8px 11px;
  cursor: pointer;
  font:
    760 9px/1.2 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.theme-toggle:hover {
  border-color: var(--green);
  color: var(--green);
}

.writeup-shell {
  width: min(100% - 48px, 1360px);
  display: grid;
  grid-template-areas: "article rail";
  grid-template-columns: minmax(0, 900px) 190px;
  gap: clamp(54px, 7vw, 110px);
  align-items: start;
  margin: 0 auto;
  padding: 0 0 110px;
}
.reading-rail {
  grid-area: rail;
  position: sticky;
  top: 106px;
  padding-top: 96px;
}
.rail-kicker {
  margin: 0 0 20px;
  color: var(--green);
  font:
    800 9px/1.3 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.toc {
  border-top: 1px solid var(--line-strong);
}
.toc a {
  position: relative;
  display: block;
  border-bottom: 1px solid var(--line);
  padding: 11px 0;
  color: var(--faint);
  font-size: 10px;
  line-height: 1.35;
}
.toc a::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  bottom: 0;
  width: 2px;
  transform: scaleY(0);
  background: var(--green);
}
.toc a:hover,
.toc a.active {
  color: var(--ink);
  padding-left: 10px;
}
.toc a.active::before {
  transform: scaleY(1);
}
.rail-meta {
  margin: 26px 0 0;
  color: var(--faint);
  font-size: 9px;
  line-height: 1.6;
}

.writeup {
  grid-area: article;
  min-width: 0;
  padding-top: clamp(58px, 8vw, 105px);
}
.writeup > h1:first-child {
  max-width: 870px;
  margin: 0;
  font-size: clamp(48px, 7.1vw, 92px);
  font-weight: 690;
  letter-spacing: -0.07em;
  line-height: 0.94;
  text-wrap: balance;
}
.writeup > h1:first-child::before {
  content: "ENGINEERING CASE STUDY  /  2026";
  display: block;
  margin: 0 0 23px;
  color: var(--green);
  font:
    800 9px/1.4 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  letter-spacing: 0.16em;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 24px;
  margin-top: 25px;
}
.writeup .article-meta p {
  margin: 0;
}
.article-meta + .hero-media {
  margin: clamp(38px, 6vw, 67px) 0 0;
}
.writeup .project-link {
  margin: 28px 0 clamp(38px, 6vw, 67px);
}
.project-link a {
  color: var(--green);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.25em;
}
.project-link a:hover {
  color: var(--ink);
}
.hero-media,
.gameplay-media {
  position: relative;
  width: 100%;
  margin-left: 0;
  overflow: hidden;
  border: 1px solid #263c31;
  border-radius: 6px;
  background: var(--night);
  box-shadow: var(--shadow);
  color: white;
}
.hero-media video,
.gameplay-media video {
  width: 100%;
  display: block;
}
.hero-media video {
  aspect-ratio: 1.53 / 1;
  object-fit: cover;
}
.gameplay-media {
  width: min(76%, 680px);
  margin: 38px auto 42px;
}
.gameplay-media video {
  aspect-ratio: 640 / 381;
  object-fit: cover;
}
.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(2, 9, 6, 0.45),
    transparent 28%,
    transparent 67%,
    rgba(2, 9, 6, 0.72)
  );
}
.hero-media figcaption {
  position: absolute;
  z-index: 2;
  inset: auto 0 0;
  display: flex;
  justify-content: space-between;
  padding: 18px 20px;
  color: #eef7f2;
  font:
    750 9px/1.4 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.live-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.live-pill::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green-bright);
  box-shadow: 0 0 0 5px rgba(97, 226, 167, 0.15);
}

.result-chart {
  margin: 0;
  border-top: 1px solid rgba(238, 247, 242, 0.18);
  background: #fff;
}
.result-chart img {
  display: block;
  width: 100%;
}
.result-chart figcaption {
  border-top: 1px solid #d9ded8;
  padding: 14px 19px 16px;
  background: #f7f6f1;
  color: #5f6c65;
  font:
    650 10px/1.5 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}
.result-chart-standalone {
  margin: 34px 0 0;
  overflow: hidden;
  border: 1px solid #263c31;
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.writeup p,
.writeup li {
  color: var(--muted);
}
.writeup p {
  margin: 1.1em 0;
}
.writeup strong {
  color: var(--ink);
}
.writeup a {
  color: var(--green);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}
.writeup a:hover {
  text-decoration-thickness: 2px;
}
.writeup h2,
.writeup h3,
.writeup h4 {
  color: var(--ink);
  text-wrap: balance;
}
.writeup h2 {
  margin: clamp(90px, 12vw, 150px) 0 30px;
  border-top: 2px solid var(--ink);
  padding-top: 19px;
  font-size: clamp(34px, 4.7vw, 56px);
  font-weight: 680;
  letter-spacing: -0.055em;
  line-height: 1.04;
  scroll-margin-top: 95px;
}
.writeup h3 {
  margin: 65px 0 20px;
  font-size: clamp(23px, 3vw, 32px);
  font-weight: 690;
  letter-spacing: -0.04em;
  line-height: 1.15;
  scroll-margin-top: 95px;
}
.writeup h4 {
  margin: 42px 0 16px;
  font-size: clamp(18px, 2.2vw, 23px);
  font-weight: 690;
  letter-spacing: -0.025em;
  line-height: 1.2;
  scroll-margin-top: 95px;
}
.writeup ul,
.writeup ol {
  padding-left: 1.35em;
}
.writeup li {
  margin: 0.48em 0;
  padding-left: 0.25em;
}
.writeup blockquote {
  margin: 40px 0;
  border-left: 3px solid var(--green);
  padding: 3px 0 3px 25px;
}
.writeup blockquote p {
  color: var(--ink);
  font-size: 19px;
}
.writeup hr {
  border: 0;
  border-top: 1px solid var(--line-strong);
  margin: 70px 0;
}

.writeup pre {
  position: relative;
  overflow: auto;
  margin: 28px 0;
  border: 1px solid #294036;
  border-radius: 5px;
  background: var(--night);
  padding: 25px 26px;
  box-shadow: 0 14px 34px rgba(12, 25, 18, 0.1);
}
.writeup pre code {
  border: 0;
  background: transparent;
  padding: 0;
  color: #d8e5de;
  font:
    500 12px/1.7 ui-monospace,
    SFMono-Regular,
    Menlo,
    Monaco,
    Consolas,
    monospace;
}
.writeup :not(pre) > code {
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--paper-2);
  padding: 0.12em 0.38em;
  color: var(--ink);
  font:
    650 0.86em/1.5 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
}
.code-label {
  display: block;
  margin: -7px 0 14px;
  color: var(--green-bright);
  font:
    800 8px/1.2 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eval-conditions {
  margin: 34px 0;
  border: 1px solid var(--line);
  background: var(--raised);
}
.eval-condition {
  display: grid;
  grid-template-columns: minmax(190px, 240px) minmax(0, 1fr);
  gap: 28px;
  padding: 22px 24px;
}
.eval-condition + .eval-condition {
  border-top: 1px solid var(--line);
}
.eval-condition-header {
  padding-top: 14px;
  padding-bottom: 14px;
  background: var(--paper-2);
  color: var(--ink);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.02em;
}
.writeup .eval-condition h3 {
  margin: 0;
  align-self: start;
  font-size: 16px;
  line-height: 1.55;
}
.writeup .eval-condition p {
  margin: 0;
}

.table-scroll {
  overflow-x: auto;
  margin: 34px 0;
}
.writeup table {
  width: 100%;
  min-width: 800px;
  border-collapse: collapse;
  background: var(--raised);
}
.writeup th,
.writeup td {
  border-bottom: 1px solid var(--line);
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
}
.writeup th {
  color: var(--ink);
  font-size: 11px;
  line-height: 1.4;
}
.writeup td {
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}
.writeup tr:last-child td {
  border-bottom: 0;
}

.data-figure {
  width: 100%;
  margin: 45px 0 55px;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: #fff;
  box-shadow: 0 18px 50px rgba(29, 40, 34, 0.09);
  overflow: hidden;
}
.data-figure img {
  width: 100%;
  height: auto;
}
.data-figure figcaption {
  border-top: 1px solid var(--line);
  background: var(--raised);
  padding: 13px 17px;
  color: var(--faint);
  font:
    700 9px/1.5 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  letter-spacing: 0.06em;
}

.system-map {
  width: 100%;
  margin: 42px 0 55px;
  border: 1px solid #a5ada6;
  border-radius: 6px;
  background: #fbfaf6;
  color: #102018;
  box-shadow: none;
  overflow: hidden;
}
.system-map > figcaption {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid #d1d3ca;
  background: #f2f0e9;
  padding: 17px 21px;
}
.visual-kicker,
.visual-meta {
  font:
    750 9px/1.4 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.visual-kicker {
  color: #157554;
}
.visual-meta {
  color: #59645e;
}
.architecture-stage {
  padding: clamp(25px, 4vw, 45px);
}
.architecture-main {
  display: grid;
  grid-template-columns: repeat(5, minmax(116px, 1fr));
  align-items: stretch;
  gap: 20px;
}
.arch-card {
  position: relative;
  min-height: 132px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid #a5ada6;
  border-radius: 4px;
  background: #fff;
  padding: 15px;
}
.arch-card + .arch-card::before {
  content: "→";
  position: absolute;
  left: -17px;
  top: 50%;
  transform: translate(-50%, -50%);
  color: #157554;
  font:
    700 15px/1 ui-monospace,
    monospace;
}
.arch-card small {
  color: #68736e;
  font:
    700 8px/1.3 ui-monospace,
    monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.arch-card strong {
  color: #102018;
  font-size: 13px;
  line-height: 1.35;
}
.arch-card p {
  margin: 7px 0 0;
  color: #59645e;
  font-size: 10px;
  line-height: 1.45;
}
.arch-card.model {
  border-color: #157554;
  background: #e4f0eb;
}
.architecture-support {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 20px;
}
.support-card {
  display: flex;
  align-items: center;
  gap: 14px;
  border: 1px dashed #a5ada6;
  padding: 13px 15px;
  color: #59645e;
  font-size: 10px;
}
.support-card b {
  color: #157554;
  font:
    800 8px/1.2 ui-monospace,
    monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.reliability-stage {
  padding: clamp(25px, 4vw, 42px);
}
.reliability-map {
  width: 100%;
  margin: 42px 0 55px;
  overflow: hidden;
  border: 1px solid #a5ada6;
  border-radius: 6px;
  background: #fbfaf6;
  color: #102018;
  box-shadow: 0 18px 50px rgba(29, 40, 34, 0.09);
}
.reliability-map > figcaption {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid #d1d3ca;
  background: #f2f0e9;
  padding: 17px 21px;
}
.reliability-map .visual-kicker {
  color: #157554;
}
.reliability-map .visual-meta {
  color: #727c76;
}
.reliability-flow {
  display: grid;
  grid-template-columns: 1.05fr 1fr 1.25fr 1fr 1fr;
  gap: 22px;
  align-items: stretch;
}
.reliability-node {
  position: relative;
  min-width: 0;
  min-height: 154px;
  display: flex;
  flex-direction: column;
  border: 1px solid #c9cec9;
  border-radius: 4px;
  background: #ffffff;
  padding: 16px;
}
.reliability-node + .reliability-node::before {
  content: "→";
  position: absolute;
  left: -18px;
  top: 50%;
  transform: translate(-50%, -50%);
  color: #157554;
  font: 700 15px/1 ui-monospace, monospace;
}
.reliability-node small {
  color: #7c8580;
  font: 700 8px/1.3 ui-monospace, monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.reliability-node strong {
  margin-top: auto;
  color: #102018;
  font-size: 13px;
  line-height: 1.35;
}
.reliability-node > span {
  margin-top: 7px;
  color: #68736d;
  font-size: 10px;
  line-height: 1.45;
}
.action-slots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-top: 11px;
}
.action-slots span {
  border: 1px solid #b8c1bb;
  border-radius: 2px;
  background: #f7f6f1;
  padding: 6px;
  color: #405047;
  font: 700 8px/1.2 ui-monospace, monospace;
  text-align: center;
  text-transform: uppercase;
}
.reliability-gate {
  border-color: #73a58f;
  background: #edf6f1;
}
.reliability-gate ul {
  display: grid;
  gap: 5px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}
.reliability-gate li {
  position: relative;
  margin: 0;
  padding: 0 0 0 15px;
  color: #4f6258;
  font-size: 9px;
  line-height: 1.35;
}
.reliability-gate li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #157554;
  font-weight: 900;
}
.reliability-accepted {
  border-color: #73a58f;
}
.reliability-engine {
  background: #f0f3ef;
}
.reliability-fallback {
  width: max-content;
  max-width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 20px auto 0;
  border: 1px dashed #c88a66;
  border-radius: 3px;
  background: #fff8f2;
  padding: 10px 13px;
  color: #735747;
  font-size: 9px;
}
.reliability-fallback .fallback-source,
.reliability-fallback strong {
  color: #b85e2e;
  font: 800 8px/1.2 ui-monospace, monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.reliability-fallback small {
  color: #8e7567;
}
.fallback-arrow {
  color: #b85e2e;
}

.article-end {
  width: 100%;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: end;
  margin-top: 90px;
  border-top: 2px solid var(--ink);
  padding-top: 30px;
}
.article-end p {
  margin: 0;
  color: var(--ink);
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 690;
  letter-spacing: -0.05em;
  line-height: 1.06;
}
.article-end-cta {
  display: grid;
  gap: 18px;
  justify-items: end;
}
.article-end-cta span {
  max-width: 420px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
  text-align: right;
}
.article-end a {
  border: 1px solid var(--ink);
  border-radius: 3px;
  background: var(--ink);
  color: var(--paper);
  padding: 13px 17px;
  font-size: 12px;
  font-weight: 800;
  text-decoration: none;
}
.article-end a:hover {
  border-color: var(--green);
  background: var(--green);
}

.site-footer {
  border-top: 1px solid var(--line);
}
.footer-inner {
  width: min(100% - 48px, 1360px);
  display: flex;
  justify-content: space-between;
  gap: 30px;
  margin: auto;
  padding: 34px 0 44px;
  color: var(--faint);
  font-size: 10px;
}
.footer-inner a {
  color: var(--green);
}

@media (max-width: 1080px) {
  .writeup-shell {
    grid-template-areas: "article";
    grid-template-columns: 1fr;
  }
  .reading-rail {
    display: none;
  }
  .writeup {
    width: min(100%, 900px);
    margin: auto;
  }
  .hero-media,
  .system-map,
  .data-figure,
  .article-end {
    width: min(100%, 1000px);
  }
  .gameplay-media {
    width: min(82%, 680px);
  }
  .table-scroll {
    margin-inline: 0;
  }
}

@media (max-width: 760px) {
  .nav-inner,
  .writeup-shell,
  .footer-inner {
    width: min(100% - 30px, 1360px);
  }
  .personal-email {
    display: none;
  }
  .brand {
    font-size: 17px;
  }
  .theme-toggle {
    width: 35px;
    min-width: 35px;
    padding: 0;
  }
  .theme-toggle span:last-child {
    display: none;
  }
  .writeup {
    padding-top: 51px;
  }
  .writeup > h1:first-child {
    font-size: clamp(43px, 14vw, 66px);
  }
  .gameplay-media {
    width: 100%;
  }
  .eval-condition {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 18px;
  }
  .eval-condition-header {
    display: none;
  }
  .hero-media figcaption span:last-child,
  .visual-meta {
    display: none;
  }
  .result-chart figcaption {
    font-size: 9px;
  }
  .writeup h2 {
    margin-top: 90px;
    font-size: clamp(33px, 10vw, 45px);
  }
  .architecture-main {
    grid-template-columns: 1fr;
  }
  .arch-card {
    min-height: 106px;
  }
  .arch-card + .arch-card::before {
    content: "↓";
    left: 50%;
    top: -11px;
  }
  .architecture-support {
    grid-template-columns: 1fr;
  }
  .reliability-flow {
    grid-template-columns: 1fr;
  }
  .reliability-node {
    min-height: 112px;
  }
  .reliability-node + .reliability-node::before {
    content: "↓";
    left: 50%;
    top: -12px;
  }
  .reliability-fallback {
    width: 100%;
    flex-wrap: wrap;
    justify-content: center;
    text-align: center;
  }
  .article-end {
    grid-template-columns: 1fr;
  }
  .article-end-cta {
    justify-items: start;
  }
  .article-end-cta span {
    text-align: left;
  }
  .footer-inner {
    flex-direction: column;
  }
}

@media (max-width: 410px) {
  .nav-actions {
    gap: 12px;
  }
  .personal-links {
    gap: 12px;
    font-size: 12px;
  }
  .writeup pre {
    padding: 19px 16px;
  }
  .architecture-stage {
    padding: 18px;
  }
  .reliability-stage {
    padding: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}