/* kfs: black, IBM Plex Sans for reading, JetBrains Mono for
   headlines and wherever the terminal speaks (commands, keys, the screen,
   the rail); ASCII only in the terminal bits. */

:root {
  --bg: #000;
  --fg: #e8e6e1;
  --body: #b9b6ae;
  --dim: #6f6c66;
  --rule: #26241f;
  --cyan: #00afaf;
  --cyan-hi: #00e5ff;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body { background: var(--bg); margin: 0; }

body {
  color: var(--body);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  padding-left: 28px; /* room for the rail */
}

a { color: var(--fg); text-decoration: underline; text-decoration-color: var(--cyan); text-underline-offset: 4px; }
a:hover { color: var(--cyan-hi); }

code { font-family: var(--mono); font-size: 0.88em; color: var(--fg); }

::selection { background: var(--cyan); color: var(--bg); }

/* ---- the rail ----------------------------------------------------------- */

#rail {
  position: fixed;
  top: 0; left: 10px; bottom: 0;
  width: 12px;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 18px;
  white-space: pre;
  color: #4a4843;
  overflow: hidden;
  user-select: none;
  pointer-events: none;
}
#rail .c { color: var(--cyan-hi); }
#rail .c2 { color: #1a7f8e; }

/* ---- header --------------------------------------------------------------- */

.masthead {
  padding: 64px 0 56px;
  margin-bottom: 56px;
  border-bottom: 1px solid var(--rule);
}

/* The logo is drawn with / \ _ : in Fira Mono its slashes fill the line
   height and nearly the whole cell, so with this line height and spacing the
   strokes of one line meet those of the next. */
.logo {
  font-family: "Fira Mono", var(--mono);
  color: var(--cyan-hi);
  font-size: 22px;
  line-height: 0.91;
  letter-spacing: -0.1em;
  margin: 0 0 40px;
  overflow-x: auto;
}

h1 {
  font-family: var(--mono);
  font-weight: 700;
  font-size: clamp(34px, 5.2vw, 68px);
  line-height: 1.08;
  letter-spacing: -0.04em;
  color: var(--fg);
  margin: 0 0 24px;
}
h1 em { font-style: normal; color: var(--cyan-hi); }

.lede {
  font-size: 22px;
  line-height: 1.45;
  color: var(--body);
  margin: 0 0 36px;
  max-width: 34em;
}
.lede code { font-size: 0.92em; color: var(--cyan-hi); }

/* the one-line install under the headline: a small terminal window */
.quick {
  max-width: 36em;
  border: 1px solid #3a3833;
  background: #0b0b0a;
}
.quick-bar {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--dim);
  padding: 6px 14px;
  border-bottom: 1px solid #3a3833;
}
.quick-bar span:first-child { color: var(--body); }
.quick-bar span:first-child::before { content: "* "; color: var(--cyan-hi); }
.quick .cmd { border: 0; max-width: none; padding: 14px 12px 14px 16px; }
.quick .cmd code { font-size: 16px; }
.quick .cmd code::before { color: var(--cyan-hi); }
.quick-alt { font-size: 14px; color: var(--dim); margin: 12px 0 0; }
.quick-alt code { color: var(--body); }

/* ---- sections ------------------------------------------------------------- */

section { margin-bottom: 64px; }

h2 {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 28px;
  letter-spacing: -0.03em;
  line-height: 1.2;
  color: var(--fg);
  margin: 0 0 22px;
  display: flex;
  align-items: baseline;
  gap: 16px;
}
h2 .no {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: 0.08em;
}

h3 {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 15px;
  color: var(--fg);
  margin: 0 0 10px;
}
h3 span { color: var(--dim); font-weight: 400; margin-left: 8px; }

p { margin: 0 0 16px; max-width: 36em; }

/* ---- features ------------------------------------------------------------- */

.features { margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 28px 36px; }
.features div { border-top: 1px solid var(--rule); padding-top: 14px; }
.features dt {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.3;
  color: var(--fg);
  margin-bottom: 6px;
}
.features dd { margin: 0; font-size: 15px; }
.features code { white-space: nowrap; }

/* ---- install steps ---------------------------------------------------- */

.steps { list-style: none; counter-reset: step; margin: 0; padding: 0; }
.steps > li {
  counter-increment: step;
  position: relative;
  padding: 0 0 28px 52px;
}
.steps > li::before {
  content: counter(step);
  position: absolute; left: 0; top: -2px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 24px;
  line-height: 1;
  color: var(--cyan-hi);
}

.cmd {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid #3a3833;
  background: #0b0b0a;
  padding: 10px 10px 10px 16px;
  max-width: 32em;
}
.cmd code { font-size: 15px; white-space: nowrap; overflow-x: auto; min-width: 0; }
.cmd code::before { content: "$ "; color: var(--dim); }

.copy {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--body);
  background: transparent;
  border: 1px solid #3a3833;
  padding: 4px 10px;
  cursor: pointer;
  flex: none;
}
.copy::before { content: "["; color: var(--dim); }
.copy::after { content: "]"; color: var(--dim); }
.copy:hover { color: var(--cyan-hi); border-color: var(--cyan); }
.copy.done { color: var(--bg); background: var(--cyan); border-color: var(--cyan); }

.note { color: var(--dim); font-size: 15px; }
.steps .sub { color: var(--dim); font-size: 14px; margin: 10px 0 0; }

/* ---- terminal blocks: usage, keys ----------------------------------------- */

.term {
  font-family: var(--mono);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--fg);
  margin: 0;
  padding: 18px 20px;
  background: #0b0b0a;
  border-left: 2px solid var(--cyan);
  overflow-x: auto;
}
.dim { color: var(--dim); }

/* ---- the screen on the right ------------------------------------------ */

.screen-wrap { position: sticky; top: 40px; }

.screen {
  margin: 0;
  border: 1px solid #3a3833;
  background: #050505;
}
.screen figcaption {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--body);
  padding: 8px 14px;
  border-bottom: 1px solid #3a3833;
}
.screen figcaption span:first-child::before { content: "$ "; color: var(--dim); }
.screen figcaption .dim::before { content: "* "; color: var(--cyan-hi); }
.screen video { display: block; width: 100%; background: #000; }
.screen video.missing { display: none; }

.placeholder { display: none; padding: 24px 22px 28px; }
.placeholder.on { display: block; }
.placeholder pre {
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--dim);
  margin: 0 0 22px;
  overflow-x: auto;
}
.placeholder p {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 20px;
  color: var(--fg);
  margin: 0;
}
.cursor { font-family: var(--mono); font-style: normal; color: var(--cyan-hi); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.caption { font-size: 14px; color: var(--dim); margin-top: 14px; }

/* ---- footer ----------------------------------------------------------------- */

footer {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 40px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: 14px;
  color: var(--dim);
}

@media (max-width: 991px) {
  .screen-wrap { position: static; }
}

@media (max-width: 575px) {
  body { font-size: 16px; padding-left: 22px; }
  #rail { left: 6px; }
  .logo { font-size: 16px; }
  .features { grid-template-columns: 1fr; }
  h2 { font-size: 24px; }
  .term { font-size: 12.5px; }
  .cmd code { white-space: normal; word-break: break-all; }
  .steps > li { padding-left: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  .cursor { animation: none; }
}