:root {
  color-scheme: dark;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  color: #e9e8df;
  background: #101214;
  --page: #101214;
  --paper: #e9e8df;
  --ink: #17191b;
  --muted: #8b9298;
  --signal: #ffb000;
  --rule: #34383b;
}

* {
  box-sizing: border-box;
}
html {
  min-width: 320px;
  background: var(--page);
}
body {
  margin: 0;
  min-height: 100vh;
  background: var(--page);
}
a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}
button,
select,
input {
  font: inherit;
}

.masthead,
footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 3.6rem;
  padding: 0 3vw;
  border-bottom: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.wordmark {
  color: var(--paper);
  font-weight: 700;
  text-decoration: none;
  text-transform: lowercase;
}

.masthead nav,
.footer-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.masthead nav a {
  color: var(--paper);
}

.console {
  padding: clamp(2rem, 6vw, 5.5rem) 3vw 3vw;
}
.console-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  margin-bottom: clamp(2.2rem, 5vw, 4.5rem);
}
.kicker,
.index {
  margin: 0 0 1rem;
  color: var(--signal);
  font:
    700 0.68rem/1 ui-monospace,
    monospace;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
h1,
h2 {
  margin: 0;
  font-weight: 520;
  letter-spacing: -0.055em;
}
h1 {
  max-width: 11ch;
  font-size: clamp(3.2rem, 8.5vw, 8.4rem);
  line-height: 0.83;
}
h2 {
  font-size: clamp(2.8rem, 6vw, 6rem);
  line-height: 0.9;
}
.clock {
  display: grid;
  gap: 0.45rem;
  margin: 0;
  text-align: right;
  font:
    500 clamp(1.3rem, 3vw, 3rem)/1 ui-monospace,
    monospace;
}
.clock small {
  color: var(--muted);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
}

.legend {
  display: grid;
  grid-template-columns: 4fr 3fr 8fr 2fr 5fr;
  gap: 0.4rem;
  padding: 0 0.8rem 0.55rem;
  color: var(--muted);
  font:
    600 0.6rem/1 ui-monospace,
    monospace;
  letter-spacing: 0.08em;
}

sfe-board {
  --sfe-board-padding: clamp(0.55rem, 1.2vw, 1.1rem);
  --sfe-board-gap: clamp(0.22rem, 0.5vw, 0.5rem);
  --sfe-board-background: #08090a;
  --sfe-board-border: 1px solid #303438;
  --sfe-cell-background: #1c1f21;
  --sfe-cell-color: #f0efe7;
  --sfe-cell-width: 1.18em;
  --sfe-cell-height: 1.54em;
  --sfe-font-size: clamp(0.56rem, 1.38vw, 1.5rem);
  --sfe-value-size: 1.42em;
}

sfe-board::part(grid) {
  display: grid;
  grid-template-columns: repeat(22, minmax(0, 1fr));
  gap: var(--sfe-board-gap);
}

sfe-cell {
  width: 100%;
}
.row-break {
  grid-column: 1 / -1;
  height: 1px;
  background: #262a2d;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 1px;
  margin-top: 1rem;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.controls button,
.controls label {
  min-height: 3.2rem;
  border: 0;
  border-radius: 0;
  background: #17191b;
  color: var(--paper);
  padding: 0.7rem 1rem;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.controls button {
  cursor: pointer;
}
.controls button:hover {
  background: var(--signal);
  color: #17191b;
}
.controls button:focus-visible,
.controls select:focus-visible,
.controls input:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -3px;
}
.controls label {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--muted);
}
.controls select {
  border: 0;
  background: transparent;
  color: var(--paper);
}
.switch {
  cursor: pointer;
}

.intro {
  display: grid;
  grid-template-columns: minmax(8rem, 1fr) minmax(0, 3fr);
  gap: 2rem;
  padding: clamp(4rem, 10vw, 10rem) 3vw;
  background: var(--paper);
  color: var(--ink);
}
.intro .index {
  color: #72777b;
}
.intro > div {
  display: grid;
  grid-template-columns: minmax(14rem, 1fr) minmax(18rem, 1fr);
  gap: clamp(2rem, 7vw, 8rem);
  align-items: start;
}
.intro p {
  max-width: 36rem;
  margin: 0;
  font-size: clamp(1rem, 1.6vw, 1.35rem);
  line-height: 1.5;
}
pre {
  grid-column: 2;
  margin: 3rem 0 0;
  padding: 1.3rem;
  overflow: auto;
  background: #d8d7ce;
  font:
    0.78rem/1.6 ui-monospace,
    monospace;
}
footer {
  border-top: 1px solid var(--rule);
  border-bottom: 0;
}

body.light-panel sfe-board {
  --sfe-board-background: #d6d5cc;
  --sfe-board-border: 1px solid #7b7e7f;
  --sfe-cell-background: #f2f0e5;
  --sfe-cell-color: #17191b;
  --sfe-split-line: rgb(0 0 0 / 0.25);
  --sfe-cell-shadow: 0 0.14em 0.3em rgb(0 0 0 / 0.16);
}

@media (max-width: 760px) {
  .masthead nav span,
  footer > span:first-child {
    display: none;
  }
  .masthead nav,
  .footer-links {
    gap: 0.8rem;
  }
  .console-heading {
    align-items: start;
  }
  .clock {
    font-size: 1rem;
  }
  .legend {
    grid-template-columns: 4fr 3fr 8fr 2fr 5fr;
    font-size: 0.45rem;
  }
  sfe-board {
    --sfe-board-gap: 0.12rem;
    --sfe-board-padding: 0.35rem;
  }
  .controls {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }
  .intro {
    grid-template-columns: 1fr;
  }
  .intro > div {
    grid-template-columns: 1fr;
  }
  pre {
    grid-column: 1;
    margin-top: 1rem;
    font-size: 0.66rem;
  }
}

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