:root {
  color-scheme: light;
  --canvas: #effaff;
  --ink: #101719;
  --muted: #657178;
  --line: rgba(16, 23, 25, 0.14);
  --accent: #f43e01;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background: var(--canvas);
  color: var(--ink);
  font-family: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  -webkit-text-size-adjust: 100%;
}

button, input { font: inherit; }

main { overflow: hidden; }

.hero {
  display: flex;
  padding: clamp(54px, 7vh, 82px) 24px 26px;
  align-items: center;
  flex-direction: column;
  justify-content: center;
}

.hero-copy {
  max-width: 920px;
  margin-bottom: 28px;
  text-align: center;
  transform: translateY(-18px);
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  margin-bottom: 14px;
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  font-weight: 300;
  letter-spacing: -0.055em;
  line-height: 0.95;
}

.hero-copy p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(0.9rem, 1.2vw, 1.05rem);
  letter-spacing: -0.012em;
}

.slideshow { display: flex; align-items: center; flex-direction: column; }

.main-slideshow { width: min(920px, 68vw); }

.slide-stage {
  display: flex;
  width: 100%;
  padding: 0;
  align-items: center;
  justify-content: center;
  border: 0;
  background: transparent;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}

.slide-stage img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
  -webkit-user-select: none;
}

.wide-stage { max-height: 56svh; }
.wide-stage img { max-height: 56svh; }

.animation-caption {
  margin: 15px 0 0;
  color: #556166;
  font-size: 0.92rem;
  text-align: center;
}

.slide-controls {
  display: flex;
  margin-top: 12px;
  gap: 8px;
}

.slide-controls button {
  display: grid;
  width: 38px;
  height: 36px;
  padding: 0;
  place-items: center;
  border: 1px solid rgba(18, 18, 18, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.7);
  color: #26343c;
  box-shadow: 0 2px 7px rgba(24, 45, 58, 0.05);
  cursor: pointer;
  transition: 140ms ease;
  -webkit-appearance: none;
  appearance: none;
}

.slide-controls button:hover { border-color: rgba(18, 18, 18, 0.24); background: #fff; transform: translateY(-1px); }
.slide-controls button:active { transform: scale(0.95); }
.slide-controls button:focus-visible, .slide-stage:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

.slide-controls svg {
  width: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.slide-controls .play-icon { fill: currentColor; stroke: none; }
.pause-icon, .is-playing .play-icon { display: none; }
.is-playing .pause-icon { display: block; }

article {
  width: min(100% - 40px, 840px);
  margin: 0 auto;
  padding: 22px 0 120px;
}

.article-lede {
  margin-bottom: 86px;
  font-size: clamp(1.22rem, 1.8vw, 1.48rem);
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.42;
}

article section { margin-top: 94px; }
article section:first-of-type { margin-top: 0; }

.section-label {
  margin-bottom: 18px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

h2 {
  margin-bottom: 26px;
  font-size: clamp(2.25rem, 5vw, 4rem);
  font-weight: 300;
  letter-spacing: -0.055em;
  line-height: 1.02;
}

h3 {
  margin: 58px 0 18px;
  font-size: clamp(1.45rem, 3vw, 2rem);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.15;
}

article p:not(.section-label):not(.article-lede) {
  margin-bottom: 20px;
  color: #263236;
  font-size: 1.06rem;
  line-height: 1.72;
}

strong { color: var(--ink); font-weight: 600; }
.inline-math { white-space: nowrap; font-family: Georgia, serif; font-style: italic; }

.media-block {
  width: min(100%, 700px);
  margin: 34px auto 42px;
}

.media-stage {
  display: flex;
  width: 100%;
  height: min(44vw, 400px);
  min-height: 250px;
  align-items: center;
  justify-content: center;
}

.media-stage img { display: block; width: 100%; height: 100%; object-fit: contain; }

figcaption {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
  text-align: center;
}

.paired-media { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.paired-media .media-stage { height: 280px; min-height: 0; }

.code-block {
  margin: 36px 0 42px;
  padding: 28px 30px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.54);
  font: 0.94rem/1.75 "SFMono-Regular", Consolas, monospace;
}

.code-block span { color: #c83509; }

.equation-stack { display: grid; margin: 40px 0; gap: 12px; }
.equation {
  padding: 12px 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  font-size: clamp(1.15rem, 2.7vw, 1.65rem);
  line-height: 1.5;
  text-align: center;
}

.equation mjx-container {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}

.matrix-primer {
  margin: 34px 0 42px;
}

.matrix-primer .equation {
  padding: 10px 0;
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
}

.matrix-primer .matrix-matmul {
  padding-block: 16px;
}

.dot-products {
  display: grid;
  margin-top: 12px;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.dot-products > div {
  min-width: 0;
}

.dot-products span {
  display: block;
  margin: 0 0 8px 2px;
  color: var(--muted);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.dot-products .equation {
  height: calc(100% - 26px);
  overflow-x: auto;
}

.comparison, .mxm-slideshow { margin: 38px auto 50px; }
.square-stage { width: min(100%, 520px); height: min(72vw, 520px); max-height: 520px; }

.slide-meta {
  display: flex;
  width: min(100%, 520px);
  margin-top: 14px;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.82rem;
}

@media (max-width: 700px) {
  .hero { padding: max(38px, env(safe-area-inset-top)) 12px 24px; }
  .hero-copy { margin-bottom: 20px; transform: translateY(-8px); }
  .main-slideshow { width: 92vw; }
  .wide-stage, .wide-stage img { max-height: 48dvh; }
  .animation-caption { max-width: 340px; font-size: 0.84rem; }
  .slide-controls { gap: 7px; }
  .slide-controls button { width: 44px; height: 44px; }
  article { width: min(100% - 30px, 840px); padding-top: 18px; }
  .article-lede { margin-bottom: 70px; }
  article section { margin-top: 76px; }
  article p:not(.section-label):not(.article-lede) { font-size: 1rem; line-height: 1.65; }
  h3 { margin-top: 48px; }
  .media-stage { height: 62vw; min-height: 220px; }
  .paired-media { grid-template-columns: 1fr; gap: 0; }
  .paired-media .media-stage { height: 60vw; }
  .square-stage { width: 82vw; height: 82vw; }
  .slide-meta { width: 82vw; }
  .equation { padding: 10px 0; font-size: 1.05rem; overflow-x: auto; }
  .dot-products { grid-template-columns: 1fr; }
  .matrix-primer .equation { font-size: 1rem; }
}

@media (max-width: 390px) {
  h1 { font-size: 2.35rem; }
  .hero-copy p { max-width: 330px; margin-inline: auto; line-height: 1.45; }
  article { width: calc(100% - 24px); }
  .article-lede { font-size: 1.16rem; }
  h2 { font-size: 2.05rem; }
  .media-stage { min-height: 190px; }
  .code-block { padding: 20px 18px; font-size: 0.82rem; }
}

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