@font-face { font-family: "IM Fell English"; src: url(fonts/IMFellEnglish-Regular.woff2) format("woff2"); font-display: swap; }
@font-face { font-family: "IM Fell English"; src: url(fonts/IMFellEnglish-Italic.woff2) format("woff2"); font-style: italic; font-display: swap; }
@font-face { font-family: "IM Fell English SC"; src: url(fonts/IMFellEnglishSC-Regular.woff2) format("woff2"); font-display: swap; }
@font-face { font-family: "Libre Caslon Text"; src: url(fonts/LibreCaslonText-Regular.woff2) format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Libre Caslon Text"; src: url(fonts/LibreCaslonText-Bold.woff2) format("woff2"); font-weight: 700; font-display: swap; }
@font-face { font-family: "Libre Caslon Text"; src: url(fonts/LibreCaslonText-Italic.woff2) format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }

/* Light: paper. Dark: the same page printed on black. */
:root {
  --paper: #efe5cf;
  --paper2: #e7dcc2;
  --ink: #2a2018;
  --line: #3b2f23;
  --soft: #6e604d;
  --rule: #cbbd9f;
  --red: #9b3022;
  --dimc: color-mix(in srgb, var(--ink) 34%, transparent);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --paper: #16130f; --paper2: #1c1813; --ink: #eadfc7; --line: #d7c9ab; --soft: #a3967f; --rule: #3a3227; --red: #e07a5f; color-scheme: dark; }
}
:root[data-theme="dark"] { --paper: #16130f; --paper2: #1c1813; --ink: #eadfc7; --line: #d7c9ab; --soft: #a3967f; --rule: #3a3227; --red: #e07a5f; color-scheme: dark; }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 18px/1.62 "Libre Caslon Text", Georgia, serif; }
a { color: inherit; text-underline-offset: 3px; text-decoration-thickness: 1px; }
button { font: inherit; color: inherit; }
p code { font: .82em ui-monospace, Menlo, monospace; }
.sc { font-family: "IM Fell English SC", "IM Fell English", serif; letter-spacing: .06em; }
.small { font-size: 15px; color: var(--soft); }

/* fsrx output: the bright start and the dimmed rest */
.fx { color: var(--ink); }
.dm { color: var(--dimc); }
.contrast .fx { font-weight: 700; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 40px; }
header.top { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; padding: 26px 0 14px; border-bottom: 1px solid var(--line); }
header.top::after { content: ""; }
.wm { font: 34px/1 "IM Fell English SC", serif; text-decoration: none; letter-spacing: .04em; }
header.top nav { display: flex; gap: 24px; align-items: baseline; font: italic 17px "IM Fell English", serif; }
header.top nav a { text-decoration: none; white-space: nowrap; }
header.top nav a:hover { text-decoration: underline; }
.toggle { background: none; border: 0; padding: 0; cursor: pointer; font: italic 17px "IM Fell English", serif; white-space: nowrap; text-decoration: underline; text-underline-offset: 3px; }
.rule2 { height: 4px; border-bottom: 1px solid var(--line); margin-bottom: 4px; }

h1 { font: 400 clamp(40px, 4.6vw, 62px)/1.04 "IM Fell English", serif; margin: 0 0 18px; letter-spacing: -.005em; }
h2 { font: 400 clamp(30px, 3.2vw, 44px)/1.1 "IM Fell English", serif; margin: 6px 0 14px; }
h3 { font: 400 22px/1.2 "IM Fell English", serif; margin: 26px 0 8px; }
section.block { padding: 72px 0; border-top: 1px solid var(--line); position: relative; }
section.block::before { content: ""; position: absolute; left: 0; right: 0; top: 4px; border-top: 1px solid var(--line); }
.intro { max-width: 38em; margin: 0 0 26px; }

/* top: the eye beside what fsrx does */
.plate { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 48px; align-items: center; padding: 40px 0 70px; }
.plate > * { min-width: 0; }
figure.eye { margin: 0; }
figure.eye svg { width: 100%; height: auto; display: block; overflow: visible; }
svg .ln { stroke: var(--line); fill: none; stroke-width: 1.2; }
svg .ln.thin { stroke-width: .7; }
svg .ln.thick { stroke-width: 2.2; }
svg .ray { stroke: var(--red); stroke-width: 1; fill: none; stroke-dasharray: 5 4; }
svg .ray.solid { stroke-dasharray: none; }
svg .ray2 { stroke: var(--soft); stroke-width: .9; fill: none; stroke-dasharray: 2 4; }
svg .lbl { font: italic 15px "IM Fell English", serif; fill: var(--ink); }
svg .lead { stroke: var(--line); stroke-width: .6; fill: none; }
svg .hatch line { stroke: var(--line); stroke-width: .6; }
svg .dot { fill: var(--red); }
figcaption { font-size: 15px; color: var(--soft); text-align: center; margin-top: 8px; font-style: italic; }
figcaption a { color: inherit; }
.lede { font-size: 19px; margin: 0 0 24px; }
.install { display: flex; border: 1px solid var(--line); max-width: 440px; }
.install code { flex: 1; padding: 11px 14px; font: 15px ui-monospace, Menlo, monospace; white-space: nowrap; overflow: auto; }
.install button { border: 0; border-left: 1px solid var(--line); background: var(--ink); color: var(--paper); padding: 0 16px; cursor: pointer; font: 14px "IM Fell English SC", serif; letter-spacing: .08em; }

/* real output, as a terminal prints it */
.term { font: 14px/1.7 ui-monospace, Menlo, monospace; border-left: 2px solid var(--line); padding: 4px 0 4px 14px; margin: 0 0 24px; overflow-x: auto; }
.term div { white-space: pre; }
.term .pr, .cmd .pr { color: var(--soft); }

/* controls */
.panel label, .panel .k { display: block; font: 13px "IM Fell English SC", serif; letter-spacing: .1em; color: var(--soft); margin: 18px 0 6px; }
.panel label:first-child, .panel .k:first-child { margin-top: 0; }
.panel textarea { width: 100%; min-height: 120px; resize: vertical; font: 15px/1.5 "Libre Caslon Text", serif; background: var(--paper2); color: var(--ink); border: 1px solid var(--rule); padding: 10px 12px; outline: none; }
.panel textarea:focus { border-color: var(--line); }
.seg { display: inline-flex; border: 1px solid var(--line); }
.seg button { background: none; border: 0; border-left: 1px solid var(--line); padding: 5px 13px; cursor: pointer; font: 16px "Libre Caslon Text", serif; }
.seg button:first-child { border-left: 0; }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }

/* try it */
.try { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 40px; align-items: start; }
.try > * { min-width: 0; }
.cmd { font: 15px ui-monospace, Menlo, monospace; margin: 0 0 12px; }
.tryout { font-size: 24px; line-height: 1.6; white-space: pre-wrap; overflow-wrap: anywhere; margin: 0; }

/* scrolling */
.rl-wrap { display: grid; grid-template-columns: minmax(0, 8fr) minmax(0, 4fr); gap: 40px; align-items: start; }
.rl-wrap > * { min-width: 0; }
figure.rl { margin: 0; }
.slip { position: relative; height: 300px; overflow: hidden; background: var(--paper2); border: 1px solid var(--line); }
.slip::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; height: 2.1em; transform: translateY(-50%); font-size: 26px; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.slip::after { content: ""; position: absolute; inset: 0; z-index: 2; pointer-events: none; background: linear-gradient(var(--paper2) 0, transparent 26%, transparent 74%, var(--paper2) 100%); }
.hand { position: absolute; top: 50%; z-index: 3; width: 0; height: 0; border: 8px solid transparent; transform: translateY(-50%); }
.hand.l { left: 8px; border-left: 12px solid var(--red); border-right: 0; }
.hand.r { right: 8px; border-right: 12px solid var(--red); border-left: 0; }
.roll { position: absolute; left: 0; right: 0; top: 0; padding: 0 40px; z-index: 1; will-change: transform; }
.rtxt { font-size: 26px; line-height: 2.1; white-space: pre-wrap; overflow-wrap: anywhere; margin: 0; padding: 130px 0 160px; }

/* how it works: an even two-by-two grid */
.how { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 64px; }
.how .cell { padding: 26px 0 30px; border-top: 1px solid var(--rule); min-width: 0; }
.how .cell h3 { margin: 0 0 14px; }
.how .cell p { margin: 0 0 12px; }
.how .install { max-width: none; margin-bottom: 10px; }
.how .small { margin-top: 12px; }
dl.man { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; margin: 0; font-size: 17px; }
dl.man dt { margin: 0; white-space: nowrap; }
dl.man dt code { font: 15px ui-monospace, Menlo, monospace; }
dl.man dd { margin: 0; }

footer { border-top: 1px solid var(--line); padding: 30px 0 60px; font-size: 15px; color: var(--soft); text-align: center; font-style: italic; }
footer p { margin: 0 auto 6px; max-width: 52em; }

@media (max-width: 960px) {
  .plate, .try, .rl-wrap, .how { grid-template-columns: 1fr; gap: 26px; }
  .plate > div { order: -1; }
  .how { row-gap: 0; }
}
@media (max-width: 600px) {
  .wrap { padding: 0 16px; }
  header.top nav { gap: 14px; }
  header.top nav .wide { display: none; }
  .wm { font-size: 28px; }
  .plate { padding: 26px 0 50px; }
  svg .lbl { font-size: 19px; }
  section.block { padding: 50px 0; }
  .term { font-size: 12px; }
  .tryout { font-size: 20px; }
  .slip { height: 250px; }
  .slip::before { font-size: 20px; }
  .rtxt { font-size: 20px; padding: 105px 0 140px; }
  .roll { padding: 0 28px; }
}