/* Layout: a quantum circuit anchors the hero. Grey Clifford gates, violet T gates:
   the "magic" the name refers to. The accent colour is reserved for magic and for
   calls to action, so it always means "this is the part that matters". */
:root {
  --ground:   #f3f3f6;
  --panel:    #e8e8ef;
  --ink:      #12121c;
  --ink-soft: #4d4d60;
  --rule:     #d2d2dc;
  --accent:   #5b3fd1;   /* magic */
  --accent-2: #7a62e6;
  --cold:     #2f6f8f;

  --display: "Bricolage Grotesque", "Avenir Next Condensed", "Arial Narrow", system-ui, sans-serif;
  --body:    "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --mono:    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --s-1: 0.8125rem; --s0: 1.0625rem; --s1: 1.3rem; --s2: 1.75rem; --s3: 2.6rem; --s4: clamp(2.4rem, 5.6vw, 4.3rem);
  --measure: 64ch;
  --wrap: 72rem;
  --logo-filter: none;
  --logo-blend: multiply;   /* the PNG has a white background */
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #0d0d16; --panel: #181826; --ink: #ebebf3; --ink-soft: #a2a2b8;
    --rule: #2a2a3c; --accent: #a995ff; --accent-2: #c3b6ff; --cold: #6fb3d2;
    --logo-filter: invert(1);
    --logo-blend: screen;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --ground: #0d0d16; --panel: #181826; --ink: #ebebf3; --ink-soft: #a2a2b8;
  --rule: #2a2a3c; --accent: #a995ff; --accent-2: #c3b6ff; --cold: #6fb3d2;
  --logo-filter: invert(1);
  --logo-blend: screen;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 400 var(--s0)/1.6 var(--body);
  padding-inline: max(16px, env(safe-area-inset-left, 0px));
}
.wrap { max-width: var(--wrap); margin-inline: auto; }
a { color: var(--accent); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { color: var(--accent-2); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
h1, h2, h3 { overflow-wrap: break-word; font-family: var(--display); line-height: 1.05; text-wrap: balance; margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
.label {
  font: 500 var(--s-1)/1.3 var(--mono);
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft);
}
.label b { color: var(--accent); font-weight: 500; }

/* ---------- header ---------- */
.top {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem 2rem;
  padding-block: 1.2rem; border-bottom: 1px solid var(--rule);
}
.mark { display: inline-flex; align-items: center; gap: 0.75rem; color: var(--ink); text-decoration: none; }
.mark img { height: 30px; width: auto; display: block; filter: var(--logo-filter); mix-blend-mode: var(--logo-blend); }
.mark span { font: 600 1.15rem/1 var(--display); letter-spacing: -0.01em; }
.top nav { display: flex; align-items: center; gap: 0.4rem 1.4rem; flex-wrap: wrap; }
.top nav a { font: 500 var(--s-1)/1 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-soft); text-decoration: none; padding-block: 0.4rem; }
.top nav a:hover, .top nav a[aria-current="page"] { color: var(--ink); }
.top nav a[aria-current="page"] { box-shadow: inset 0 -2px 0 var(--accent); }
.top nav a.nav-cta { color: var(--accent); }

/* ---------- hero ---------- */
.hero {
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center; padding-block: clamp(3rem, 8vw, 6rem) clamp(2.5rem, 6vw, 4.5rem);
}
.hero h1 { font-size: var(--s4); font-weight: 800; margin-top: 1.1rem; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .lede { margin-top: 1.6rem; font-size: var(--s1); line-height: 1.5; color: var(--ink-soft); max-width: 40ch; }
.actions { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 2.2rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font: 600 0.95rem/1 var(--display); letter-spacing: 0.01em;
  padding: 0.95rem 1.3rem; border-radius: 2px; text-decoration: none;
  border: 1px solid var(--ink); color: var(--ink);
}
.btn.primary { background: var(--ink); color: var(--ground); }
.btn.primary:hover { background: var(--accent); border-color: var(--accent); color: var(--ground); }
.btn:not(.primary):hover { border-color: var(--accent); color: var(--accent); }

/* the circuit */
.circuit { margin: 0; width: 100%; }
.circuit svg { width: 100%; height: auto; display: block; overflow: visible; }
.circuit .wire-line { stroke: var(--ink-soft); stroke-width: 1.2; }
.circuit .gate rect { fill: var(--panel); stroke: var(--ink-soft); stroke-width: 1; }
.circuit .gate text { font: 500 13px var(--mono); fill: var(--ink); text-anchor: middle; dominant-baseline: central; }
.circuit .gate.t rect { fill: var(--accent); stroke: var(--accent); }
.circuit .gate.t text { fill: var(--ground); }
.circuit .ctl { fill: var(--ink); }
.circuit .tgt { fill: none; stroke: var(--ink); stroke-width: 1.2; }
.circuit .meter rect { fill: var(--ground); stroke: var(--ink-soft); }
.circuit .meter path { fill: none; stroke: var(--ink); stroke-width: 1.2; }
.circuit .ket { font: 400 13px var(--mono); fill: var(--ink-soft); }
.circuit .key { font: 400 11px var(--mono); fill: var(--ink-soft); }
.circuit .key-c { fill: var(--panel); stroke: var(--ink-soft); }
.circuit .key-t { fill: var(--accent); }
@media (prefers-reduced-motion: no-preference) {
  .circuit .gate.t rect { animation: glow 3.2s ease-in-out infinite; }
  .circuit .gate.t:nth-of-type(2n) rect { animation-delay: 1.1s; }
  @keyframes glow { 0%,100% { opacity: 1; } 50% { opacity: 0.55; } }
}
.circuit figcaption { margin-top: 1rem; font: 400 var(--s-1)/1.55 var(--mono); color: var(--ink-soft); max-width: 52ch; }
.circuit figcaption b { color: var(--accent); font-weight: 500; }

/* ---------- sections ---------- */
section { padding-block: clamp(3rem, 7vw, 5.5rem); border-top: 1px solid var(--rule); }
.sec-head { display: grid; gap: 1rem; margin-bottom: 2.6rem; }
.sec-head h2 { font-size: var(--s3); font-weight: 800; max-width: 24ch; }
.sec-head p { max-width: var(--measure); color: var(--ink-soft); }

/* term / explanation / note rows */
.ideas { display: grid; }
.idea {
  display: grid; grid-template-columns: minmax(0, 14rem) minmax(0, 1fr) minmax(0, 15rem);
  gap: 0.6rem 3rem; padding-block: 1.6rem; border-top: 1px solid var(--rule);
}
.idea:last-child { border-bottom: 1px solid var(--rule); }
.idea h3 { font-size: var(--s1); font-weight: 600; }
.idea p { max-width: var(--measure); }
.idea .note { font: 400 0.95rem/1.5 var(--mono); color: var(--accent); }

/* a single emphasised statement */
.callout {
  margin-top: 2.6rem; display: grid; grid-template-columns: minmax(0, 14rem) minmax(0, 1fr); gap: 0.6rem 3rem;
}
.callout p:not(.label) { max-width: var(--measure); font-size: var(--s1); line-height: 1.5; }
.callout p:not(.label) + p:not(.label) { margin-top: 1rem; }
.callout strong { font-weight: 600; }
.callout p:not(.label), .callout .more { grid-column: 2; }
.callout .more { font: 500 var(--s-1)/1.5 var(--mono); letter-spacing: 0.04em; }

/* three short columns */
.cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--ink); }
.col { padding: 1.6rem 1.6rem 1.8rem 0; display: grid; gap: 0.6rem; align-content: start; }
.col + .col { padding-left: 1.6rem; border-left: 1px solid var(--rule); }
.col h3 { font-size: var(--s2); font-weight: 600; }
.col .label { color: var(--accent); }
.col p { color: var(--ink-soft); }

/* focus areas: the two pages behind the home page */
.focus { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.card {
  display: grid; gap: 0.9rem; align-content: start; padding: clamp(1.4rem, 3vw, 2.4rem);
  background: var(--panel); color: var(--ink); text-decoration: none; border-top: 3px solid var(--accent);
}
.card h3 { font-size: var(--s2); font-weight: 800; }
.card p { color: var(--ink-soft); max-width: 48ch; }
.card .go { font: 500 var(--s-1)/1.3 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); margin-top: 0.6rem; }
.card:hover { color: var(--ink); }
.card:hover .go { color: var(--accent-2); }

/* numbered steps */
.steps { list-style: none; margin: 0; padding: 0; counter-reset: step; }
.steps li {
  counter-increment: step; display: grid; grid-template-columns: minmax(0, 14rem) minmax(0, 1fr);
  gap: 0.4rem 3rem; padding-block: 1.3rem; border-top: 1px solid var(--rule);
}
.steps li:last-child { border-bottom: 1px solid var(--rule); }
.steps h3 { font-size: var(--s1); font-weight: 600; }
.steps h3::before { content: counter(step, decimal-leading-zero) "  "; font: 500 var(--s-1)/1 var(--mono); color: var(--accent); white-space: pre; }
.steps p { max-width: var(--measure); color: var(--ink-soft); }

/* contact */
.contact {
  padding: 2rem clamp(1.2rem, 3vw, 2.4rem); background: var(--panel);
  display: flex; flex-wrap: wrap; gap: 1.4rem 3rem; align-items: center; justify-content: space-between;
}
.contact h3 { font-size: var(--s2); font-weight: 800; }
.contact p { color: var(--ink-soft); margin-top: 0.4rem; max-width: 52ch; }

/* news wire */
.wire { list-style: none; margin: 0; padding: 0; }
.wire li {
  display: grid; grid-template-columns: minmax(0, 14rem) minmax(0, 1fr) auto; gap: 0.4rem 3rem;
  padding-block: 1.3rem; border-top: 1px solid var(--rule); align-items: baseline;
}
.wire li:last-child { border-bottom: 1px solid var(--rule); }
.wire time { font: 400 var(--s-1)/1.4 var(--mono); color: var(--ink-soft); font-variant-numeric: tabular-nums; }
.wire h3 { font: 600 var(--s0)/1.35 var(--display); }
.wire p { margin-top: 0.3rem; color: var(--ink-soft); font-size: 0.97rem; max-width: var(--measure); }
.wire .src { font: 400 var(--s-1)/1.4 var(--mono); white-space: nowrap; }

/* events (only rendered when content/events.json has upcoming ones) */
.events { display: grid; gap: 1rem; margin-top: 1rem; }
.event {
  padding: 1.6rem clamp(1.2rem, 3vw, 2.4rem); background: var(--panel);
  display: flex; flex-wrap: wrap; gap: 1.2rem 3rem; align-items: center; justify-content: space-between;
}
.event h3 { font-size: var(--s2); font-weight: 800; }
.event p { color: var(--ink-soft); margin-top: 0.4rem; max-width: 52ch; }
.event time { font: 500 var(--s-1)/1.3 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--accent); }

/* inner pages */
.page-head { padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(2rem, 5vw, 3.5rem); }
.page-head h1 { font-size: var(--s4); font-weight: 800; margin-top: 1rem; max-width: 18ch; }
.page-head p:not(.label) { margin-top: 1.4rem; font-size: var(--s1); line-height: 1.5; color: var(--ink-soft); max-width: 52ch; }

footer {
  border-top: 1px solid var(--rule); padding-block: 2rem 2.6rem;
  display: flex; flex-wrap: wrap; gap: 0.6rem 2rem; justify-content: space-between;
  font: 400 var(--s-1)/1.5 var(--mono); color: var(--ink-soft);
}
footer nav { display: flex; flex-wrap: wrap; gap: 0.6rem 1.4rem; }
footer a { color: var(--ink-soft); }
footer a:hover { color: var(--ink); }

/* ---------- narrow ---------- */
@media (max-width: 860px) {
  .hero { grid-template-columns: minmax(0, 1fr); }
  .callout, .idea, .steps li, .wire li { grid-template-columns: minmax(0, 1fr); }
  .callout p:not(.label), .callout .more { grid-column: 1; }
  .cols, .focus { grid-template-columns: minmax(0, 1fr); }
  .col, .col + .col { padding: 1.4rem 0; border-left: 0; }
  .col + .col { border-top: 1px solid var(--rule); }
}
@media (max-width: 640px) {
  .top nav { width: 100%; gap: 0.2rem 1.1rem; }
}