/* Logisim Revisited site styles. GPL-3.0-or-later. */
@font-face{font-family:'Newsreader';font-weight:400;font-style:normal;font-display:swap;src:url(fonts/newsreader-latin-400-normal.woff2) format('woff2')}
@font-face{font-family:'Newsreader';font-weight:500;font-style:normal;font-display:swap;src:url(fonts/newsreader-latin-500-normal.woff2) format('woff2')}
@font-face{font-family:'IBM Plex Sans';font-weight:400;font-style:normal;font-display:swap;src:url(fonts/ibm-plex-sans-latin-400-normal.woff2) format('woff2')}
@font-face{font-family:'IBM Plex Sans';font-weight:500;font-style:normal;font-display:swap;src:url(fonts/ibm-plex-sans-latin-500-normal.woff2) format('woff2')}
@font-face{font-family:'IBM Plex Sans';font-weight:600;font-style:normal;font-display:swap;src:url(fonts/ibm-plex-sans-latin-600-normal.woff2) format('woff2')}
@font-face{font-family:'IBM Plex Mono';font-weight:400;font-style:normal;font-display:swap;src:url(fonts/ibm-plex-mono-latin-400-normal.woff2) format('woff2')}
:root {
  --bg: #F5F2EA;
  --card: #FFFDF8;
  --fg: #1C1B18;
  --muted: #55524A;
  --line: #D9D3C5;
  --thick: #1C1B18;
  --accent: #2B4EA2;
  --surface-2: #EAE5D8;
  --accent-soft: #E3E8F5;
  --tint-a: #EEF2FB;
  --tint-b: #FBF3E2;
  --key: #2B4EA2;
  --c0: #C9D6F4;
  --c1: #F3E3C0;
  --fin: #6B3FA0;
  --elim: #A8321F;
  --elim-bg: #F6D3CA;
  --place: #2E7D4F;
  --place-bg: #D5EBDC;
  --wire-0: #2E7D4F;
  --wire-1: #A8321F;
  --wire-z: #2B4EA2;
  --wire-e: #A8321F;
  --wire-x: #6B3FA0;
  --font-display: 'Newsreader', Georgia, serif;
  --font-ui: 'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
  --led: #E8B400;
  --loop-0: #2B4EA2;
  --loop-1: #A8321F;
  --loop-2: #2E7D4F;
  --loop-3: #6B3FA0;
  --loop-4: #B26A00;
  --loop-5: #00778B;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15171B;
    --card: #1D2026;
    --fg: #ECE8DF;
    --muted: #A9A498;
    --line: #3A3E47;
    --thick: #ECE8DF;
    --accent: #9DB4F5;
    --surface-2: #252932;
    --accent-soft: #22384F;
    --tint-a: #232A3A;
    --tint-b: #2E2A1E;
    --key: #9DB4F5;
    --c0: #2C3D66;
    --c1: #4A3A1C;
    --fin: #C9A6F0;
    --elim: #FF9A85;
    --elim-bg: #5A2A22;
    --place: #7FD39B;
    --place-bg: #22402C;
    --wire-0: #7FD39B;
    --wire-1: #FF9A85;
    --wire-z: #9DB4F5;
    --wire-e: #FF9A85;
    --wire-x: #C9A6F0;
    --led: #FFD23F;
    --loop-0: #9DB4F5;
    --loop-1: #FF9A85;
    --loop-2: #7FD39B;
    --loop-3: #C9A6F0;
    --loop-4: #F0B866;
    --loop-5: #6FD3E3;
  }
}
:root[data-theme="dark"] {
  --bg: #15171B;
  --card: #1D2026;
  --fg: #ECE8DF;
  --muted: #A9A498;
  --line: #3A3E47;
  --thick: #ECE8DF;
  --accent: #9DB4F5;
  --surface-2: #252932;
  --accent-soft: #22384F;
  --tint-a: #232A3A;
  --tint-b: #2E2A1E;
  --key: #9DB4F5;
  --c0: #2C3D66;
  --c1: #4A3A1C;
  --fin: #C9A6F0;
  --elim: #FF9A85;
  --elim-bg: #5A2A22;
  --place: #7FD39B;
  --place-bg: #22402C;
  --wire-0: #7FD39B;
  --wire-1: #FF9A85;
  --wire-z: #9DB4F5;
  --wire-e: #FF9A85;
  --wire-x: #C9A6F0;
  --led: #FFD23F;
  --loop-0: #9DB4F5;
  --loop-1: #FF9A85;
  --loop-2: #7FD39B;
  --loop-3: #C9A6F0;
  --loop-4: #F0B866;
  --loop-5: #6FD3E3;
}



* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 400 16px/1.65 var(--font-ui); }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
img, svg { max-width: 100%; height: auto; }
code, kbd, .mono { font-family: var(--font-mono); font-size: .88em; }
code { background: var(--surface-2); padding: 1px 5px; border-radius: 3px; overflow-wrap: anywhere; }
kbd { padding: 1px 6px; border: 1px solid var(--line); border-radius: 3px; background: var(--card); }
h1, h2, h3 { font-family: var(--font-display); font-weight: 500; line-height: 1.2; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.1rem); margin: .2em 0 .4em; }
h2 { font-size: 1.55rem; margin: 1.8em 0 .5em; }
h3 { font-size: 1.15rem; margin: 1.4em 0 .4em; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--card); padding: 8px 14px; border-radius: 6px; z-index: 10; }
.skip:focus { left: 8px; }

.top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 10px max(16px, calc((100vw - 1180px) / 2)); background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--fg); }
.wordmark { font: 500 1.25rem/1 var(--font-display); display: flex; flex-direction: column; }
.wordmark small { font: 600 .62rem/1.3 var(--font-ui); letter-spacing: .22em; text-transform: uppercase; color: var(--muted); }
.top nav { display: flex; align-items: center; gap: 4px 18px; flex-wrap: wrap; }
.top nav a:not(.btn) { color: var(--fg); text-decoration: none; font-size: .95rem; padding: 4px 0; border-bottom: 2px solid transparent; }
.top nav a:not(.btn):hover, .top nav a[aria-current] { border-bottom-color: var(--accent); }

main { max-width: 760px; margin: 0 auto; padding: 40px 16px 72px; }
main.wide { max-width: 1180px; }
footer { border-top: 1px solid var(--line); padding: 28px 16px 40px; text-align: center; color: var(--muted); font-size: .88rem; }
footer p { margin: .3em auto; max-width: 760px; }

.btn { display: inline-flex; align-items: center; justify-content: center; padding: 10px 20px; border-radius: 8px; background: var(--accent); color: var(--card); text-decoration: none; font-weight: 500; font-size: .95rem; border: 1px solid var(--accent); transition: filter .15s, transform .15s; }
.btn:hover { filter: brightness(1.12); transform: translateY(-1px); }
.btn.alt { background: transparent; color: var(--accent); }
.btn.small { padding: 6px 14px; font-size: .85rem; }
.eyebrow { font: 600 .72rem/1.2 var(--font-ui); letter-spacing: .16em; text-transform: uppercase; color: var(--accent); margin: 0 0 .6em; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 62ch; }

.hero { display: grid; gap: 40px; grid-template-columns: 1.1fr .9fr; align-items: center; padding: 28px 0 56px; }
.hero h1 { font-size: clamp(2.4rem, 6vw, 4rem); }
.hero .actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 1.4em; }
.hero-board { margin: 0; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px; box-shadow: 0 12px 40px rgba(0,0,0,.08); }
.gatecard { margin: 0; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px; box-shadow: 0 12px 40px rgba(0,0,0,.08); }
.gatecard svg { width: 100%; }
.gatecard figcaption, .hero-board figcaption { margin-top: 10px; font-size: .85rem; color: var(--muted); }
.spotlight { display: grid; gap: 40px; grid-template-columns: 1fr 1fr; align-items: start; padding: 40px 0; border-top: 1px solid var(--line); }
.coach-quote { background: var(--accent-soft); border-left: 4px solid var(--accent); border-radius: 8px; padding: 14px 18px; margin: 1.2em 0; }
.coach-quote p { margin: .5em 0 0; }
.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); padding: 40px 0; border-top: 1px solid var(--line); }
.cards article { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.cards .eyebrow { margin-bottom: .5em; }
.cards h2 { font-size: 1.2rem; margin: 0 0 .4em; }
.cards p { margin: 0; color: var(--muted); font-size: .95rem; }
.learnhome, .trust { text-align: center; color: var(--muted); border-top: 1px solid var(--line); padding: 28px 0 0; }

.tgrid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); margin: 1.2em 0; }
.tcard { display: flex; flex-direction: column; gap: 6px; padding: 16px 18px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; text-decoration: none; color: var(--fg); transition: border-color .15s, transform .15s, box-shadow .15s; }
.tcard:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.08); }
.tcard strong { font: 500 1.1rem/1.3 var(--font-display); }
.tcard span:last-child { color: var(--muted); font-size: .9rem; }
.band { align-self: flex-start; font: 600 .68rem/1 var(--font-mono); letter-spacing: .08em; padding: 4px 8px; border-radius: 99px; background: var(--accent-soft); color: var(--accent); text-transform: uppercase; }
.band.lv-easy { background: var(--place-bg); color: var(--place); }
.band.lv-medium { background: var(--tint-b); color: var(--fin); }
.band.lv-hard { background: var(--elim-bg); color: var(--elim); }
.group h2 .num { font: 500 .8rem var(--font-mono); color: var(--muted); margin-right: 6px; }

.with-rail { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 40px; align-items: start; }
.rail { position: sticky; top: 76px; }
.railselect { display: none; }
.railnav h2 { font: 600 .72rem/1.2 var(--font-ui); letter-spacing: .16em; text-transform: uppercase; margin: 0 0 .8em; }
.railnav h2 a { color: var(--muted); text-decoration: none; }
.railnav ul { list-style: none; margin: 0; padding: 0; }
.railnav li a { display: block; padding: 6px 12px; margin-left: -12px; border-radius: 6px; text-decoration: none; color: var(--fg); font-size: .92rem; }
.railnav li a:hover { background: var(--surface-2); }
.railnav li a[aria-current] { background: var(--accent-soft); color: var(--accent); font-weight: 500; }
.content > h1:first-child, .guide > h1:first-of-type { margin-top: 0; }
.crumbs { font-size: .85rem; color: var(--muted); margin: 0; }
.prose p, .content p, .content li { max-width: 68ch; }
.tip { background: var(--tint-b); border-radius: 8px; padding: 10px 14px; }
.guide-cols { display: grid; gap: 32px; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; margin-top: 1em; }
.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 48px; }
.pager a { display: flex; flex-direction: column; padding: 12px 18px; border: 1px solid var(--line); border-radius: 10px; text-decoration: none; background: var(--card); }
.pager a:hover { border-color: var(--accent); }
.pager small { color: var(--muted); }
.placeholder { background: var(--card); border: 1px dashed var(--line); border-radius: 12px; padding: 22px; text-align: center; color: var(--muted); }
table.ref { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: .95rem; }
table.ref th, table.ref td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.ref th { font-weight: 600; width: 9em; color: var(--muted); }
.legend { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0; font: 600 .7rem var(--font-mono); }
.legend .lg { padding: 2px 8px; border-radius: 99px; }
.legend .place { background: var(--place-bg); color: var(--place); }
.legend .e, .legend .elim { background: var(--elim-bg); color: var(--elim); }
.legend .z { background: var(--tint-a); color: var(--wire-z); }

figure.circuit { margin: 0; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
figure.circuit .schematic { display: block; margin: 0 auto; }
figure.circuit figcaption { margin-top: 12px; font-size: .85rem; color: var(--muted); }
figure.circuit p { margin: 12px 0 0; }
figure.part { max-width: 360px; margin: 1.2em 0; }
figure.part .schematic { width: 100%; height: auto; max-height: 220px; }
.figure-col { display: grid; gap: 20px; align-content: start; position: sticky; top: 76px; }
table.truth { width: 100%; border-collapse: collapse; font: .9rem var(--font-mono); background: var(--card); border: 1px solid var(--line); }
table.truth caption { caption-side: top; text-align: left; font: .85rem var(--font-ui); color: var(--muted); padding: 0 0 8px; }
table.truth th, table.truth td { padding: 6px 14px; text-align: center; border-bottom: 1px solid var(--line); }
table.truth th { background: var(--surface-2); font-weight: 600; }
table.truth .out { border-left: 1px solid var(--line); }
table.truth td.v1 { color: var(--wire-1); font-weight: 600; }
table.truth td.v0 { color: var(--wire-0); }
table.truth td.vE { color: var(--wire-e); background: var(--elim-bg); font-weight: 600; }

@media (max-width: 860px) {
  .figure-col { position: static; }
  .hero, .spotlight, .guide-cols { grid-template-columns: 1fr; }
  .with-rail { grid-template-columns: 1fr; gap: 20px; }
  .rail { position: static; }
  .railnav { display: none; }
  .railselect { display: block; }
  .railselect span { display: block; font-size: .8rem; color: var(--muted); margin-bottom: 4px; }
  .railselect select { width: 100%; font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--fg); min-height: 44px; }
  .top { position: static; }
  .top nav a:not(.btn) { padding: 8px 0; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; } }

/*
 * Logisim Revisited. GPL-3.0-or-later; see LICENSE.
 * Schematic styles shared by the app canvas and the website (render/schematic.ts emits these classes).
 */
.glyph-body { fill: var(--card); stroke-width: 2; stroke-linejoin: round; }
.glyph-line { fill: none; stroke-width: 2; stroke-linecap: round; }
.glyph-title { font: 600 10px var(--font-ui); fill: var(--fg); pointer-events: none; }
.glyph-value { font: 600 11px var(--font-mono); fill: var(--fg); pointer-events: none; }
.glyph-big { font: 600 26px var(--font-mono); fill: var(--fg); pointer-events: none; }
.glyph-label { font: 500 11px var(--font-ui); fill: var(--muted); pointer-events: none; }
.glyph-pin { font: 500 8.5px var(--font-mono); fill: var(--muted); pointer-events: none; }
.pin-dot { stroke: var(--card); stroke-width: 1; pointer-events: none; }
.wire { stroke-linecap: round; pointer-events: none; transition: stroke .1s; }
.schematic { max-width: 100%; height: auto; overflow: visible; }