* {
  --title-column-width: 9ch;
  --column-gap: 6ch;
  --text-wrap-width: 62ch;
  --line-height: 1.2em;
  --vertical-spacing: 7em;
  --half-vertical-spacing: 2.8em;
  --light: rgb(200, 201, 202);
  --subtle: rgb(140, 141, 142);
  --dim: rgb(100,100,100);
  --dark: rgb(40,40,40);
  --lichen: #8FAE8E;
  --font-size: 1.2em;
  --single-bottom-line-padding: calc(1 * var(--line-height)) 3ch calc(1 * var(--line-height)) 3ch;
  --double-bottom-line-padding: calc(1 * var(--line-height)) 3ch calc(2 * var(--line-height)) 3ch;
}

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

html {
  box-sizing: border-box;
  background-color: black;
  height: 100%;
}

body {
  font-size: var(--font-size);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-weight: 400;
  line-height: var(--line-height);
  margin: 0;
  color: var(--light);
  min-height: 100%;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  padding: 0;
  font-weight: 700;
  font-size: 100%;
  min-height: var(--line-height);
}

h1 {
  font-size: 1.15em;
}

h2 {
  font-weight: inherit;
}

img {
  width: 100%;
  display: block;
}

.mono {
  font-family: inherit;
  margin: 0;
  padding: 0;
  max-width: var(--text-wrap-width);
}

/* Text stack: replaces white-space: pre-line with proper flexbox layout */
.text-stack {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.text-stack > * {
  display: block;
}

/* Accordion */
.accordion {
  display: flex;
  flex-direction: column;
  gap: calc(0.2 * var(--line-height));
}

.accordion-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  padding: 0;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.6ch;
}

.accordion-chevron {
  display: inline-block;
  transform: rotate(90deg);
  transition: transform 0.2s ease;
}

.accordion-panel {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.25s ease, opacity 0.2s ease;
}

.accordion-panel.is-open {
  opacity: 1;
}

.accordion-btn.is-open .accordion-chevron {
  transform: rotate(-90deg);
}

.accordion-inner {
  display: flex;
  flex-direction: column;
  gap: calc(0.25 * var(--line-height));
  padding-bottom: calc(0.5 * var(--line-height));
}

/* Spacer utilities to replicate blank line spacing */
.spacer-1 { height: var(--line-height); }
.spacer-2 { height: calc(2 * var(--line-height)); }
.spacer-3 { height: calc(3 * var(--line-height)); }
.spacer-4 { height: calc(4 * var(--line-height)); }
.spacer-5 { height: calc(5 * var(--line-height)); }

a {
  color: white;
  text-decoration: none;
}

a:hover {
  color: var(--light);
  text-decoration: none;
}

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

a.dim:hover {
  color: var(--light);
}

section,
section.col_1 {
  display: grid;
  grid-template-columns: var(--title-column-width) max-content;
  grid-column-gap: var(--column-gap);
  padding: var(--single-bottom-line-padding);
  width: 100%;
  margin: 0;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  align-items: start;
}

section.col_2 {
  grid-template-columns: var(--title-column-width) max-content 1fr;
  align-items: start;
}

section.double_padding {
  padding: var(--double-bottom-line-padding);
}

.footer-logo {
  display: flex;
  justify-content: flex-end;
  align-self: start;
  margin-left: auto; /* Add this */
}

.footer-logo img {
  height: auto;
  width: 100px;
  max-height: 8em;
}

ol {
  margin: 0;
  padding: 0;
}

ol li {
  padding-top: 0.25em;
  border-top: 1px solid var(--light);
  margin-bottom: var(--line-height);
}

video {
  width: 100%;
  display: block;
}

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

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

.btn {
  padding: 0 2px;
  border: 1px solid var(--lichen);
  background-color: var(--lichen);
  color: var(--dark);
  font: inherit;
  cursor: pointer;
}

.btn:hover {
  border: 1px solid var(--lichen);
  background-color: transparent;
  text-decoration: none;
  color: var(--lichen);
}

.fixed-buy-btn {
  position: fixed;
  top: 1.5em;
  right: 2em;
  z-index: 1000;
  padding: 3px 6px;
}

.inline-buy-btn {
  display: inline-block;
}

/* Desktop: show fixed button, hide inline buttons */
@media (min-width: 1081px) {
  .inline-buy-btn {
    display: none;
  }
}

/* Mobile: hide fixed button, show inline buttons */
@media (max-width: 1080px) {
  .fixed-buy-btn {
    display: none;
  }
}

.btn-big {
  padding: 4px 7px;
  border: 1px solid var(--lichen);
  background-color: var(--lichen);
  color: var(--dark);
  font: inherit;
  cursor: pointer;
}

.btn-big:hover {
  border: 1px solid var(--lichen);
  background-color: transparent;
  text-decoration: none;
  color: var(--lichen);
}

.btn-outline {
  padding: 0 2px;
  border: 1px solid var(--dim);
  color: var(--dim);
  font: inherit;
  background-color: transparent;
  cursor: pointer;
}

.btn-outline:hover {
  background-color: var(--dim);
  color: var(--dark);
  text-decoration: none;
}

.option-row {
  display: flex;
  gap: 2ch;
  flex-wrap: wrap;
}

select.btn {
  appearance: none;
  padding: 0 2ch 0 1ch;
}

.diagram {
  position: relative;
  max-height: 90vh;
  height: 90vh;
  padding: 0;
  margin: 0;
}

.diagram img {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  height: 100%;
  width: auto;
  max-width: 100%;
  margin: 0;
  padding: 0;
  object-fit: contain;
}

.diagram svg {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

.diagram svg text {
  text-anchor: middle;
  font-size: 16px;
  fill: var(--dim);
}

.diagram svg path {
  fill: none;
  stroke: black;
  stroke-width: 1px;
}

.diagram svg circle {
  r: 2.5px;
  fill: black;
  stroke: none;
}

/* Hide mobile text overlay on desktop */
.diagram-text-overlay {
  display: none;
}

.flip {
  background-color: var(--light);
  perspective: 200vw;
  position: relative;
  height: 100vw;
  overflow: hidden;
}

.flip_inner {
  position: relative;
  transition: transform 0.8s;
  transform-style: preserve-3d;
  display: flex;
  justify-content: center;
}

.anim_back {
  transform: rotateY(180deg);
}

.anim_front .bg,
.anim_back .bg {
  position: relative;
  width: auto;
  height: 100vw;
}

.anim_front .GIFoverlay {
  position: absolute;
  width: 73.5%;
  left: 12.7%;
  top: 19.0%;
  opacity: 70%;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  mix-blend-mode: multiply;
}

.anim_front,
.anim_back {
  position: absolute;
  backface-visibility: hidden;
}

.rotated {
  transform: rotateY(180deg);
}

.rotated .anim_front {
  opacity: 0.99;
}

#header {
  position: absolute;
}

#header > .mono {
  max-width: 400px;
  word-break: break-word;
}

@media (max-width: 1080px) {
  body {
    font-size: clamp(0.9rem, 2.2vw, 1rem);
  }

  section,
  section.col_1,
  section.col_2 {
    padding: calc(1 * var(--line-height)) 2ch;
    width: 100vw;
    max-width: 100vw;
    overflow: hidden;
  }

  section.col_1 {
    grid-template-columns: 1fr;
  }

  section.col_1 h2 {
    margin-bottom: var(--line-height);
  }

  /* 2-column layout (default section) */
  section {
    grid-template-columns: 18vw 74vw;
    grid-column-gap: 2vw;
  }

  /* 3-column layout */
  section.col_2 {
    grid-template-columns: 30vw 58vw;
    grid-column-gap: 2vw;
  }

  section.col_2 > :nth-child(3) {
    grid-column: 1 / -1;
    justify-self: start;
    width: 92vw;
    margin-top: var(--vertical-spacing);
    margin-bottom: var(--half-vertical-spacing);
  }

  #header {
    position: static;
  }

  .footer-logo {
    display: none;
  }

  .mono {
    max-width: 100%;
    min-width: 0;
    word-break: break-word;
    overflow-wrap: break-word;
  }

  /* Ensure text-stack items wrap properly on mobile */
  .text-stack {
    max-width: 100%;
    min-width: 0;
  }

  .text-stack > span,
  .text-stack > a {
    max-width: 100%;
    overflow-wrap: break-word;
    word-wrap: break-word;
  }

  .diagram {
    height: auto;
    max-height: none;
    padding: 0;
    position: relative;
  }

  .diagram img {
    position: static;
    width: 100%;
    height: auto;
    transform: none;
    max-width: none;
  }

  /* Hide SVG on mobile */
  .diagram svg {
    display: none;
  }

  /* Show text overlay on mobile */
  .diagram-text-overlay {
    display: flex;
    position: absolute;
    top: 0;
    left: 0;
    padding: calc(1 * var(--line-height)) 2ch;
    color: var(--dark);
  }

  .flip {
    height: auto;
  }

  .anim_front .bg,
  .anim_back .bg {
    height: auto;
    width: 100%;
  }

  .flip_inner,
  .anim_front,
  .anim_back {
    position: static;
  }
}