/* Calculemus — philosophical predecessors of AI */
:root {
  color-scheme: dark;
  --bg: #101418;
  --bg2: #171d24;
  --panel: #1c242d;
  --line: #2a3542;
  --fg: #dde4ea;
  --fg2: #a7b2bd;
  --fg3: #79858f;
  --acc: #d9a441;        /* brass — the machine line */
  --logic: #6fa8dc;      /* the logic line */
  --gegen: #c47a6d;      /* the counter-voices */
  --maschine: #d9a441;
  --wort: #a48fc9;       /* the animated word */
  --accfg: #14100a;
  --accbg: rgba(217,164,65,.09); --accline: rgba(217,164,65,.25);
  --markbg: rgba(217,164,65,.35);
  --ok: #8fce8f; --okline: #3c5c3c;
  --serif: Georgia, "Times New Roman", serif;
  --mono: "Consolas", "SF Mono", monospace;
}
/* Daylight: the same apparatus on paper. Every colour is a variable, so the
   theme is this block and nothing else; the atlas reads the variables and
   the data-theme attribute when it draws. */
html[data-theme="light"] {
  color-scheme: light;
  --bg: #f8fafc;
  --bg2: #eef2f6;
  --panel: #ffffff;
  --line: #d3dce4;
  --fg: #16212c;
  --fg2: #48555f;
  --fg3: #6e7b85;
  --acc: #8f6414;
  --logic: #2c6ba3;
  --gegen: #9a4b3e;
  --maschine: #8f6414;
  --wort: #6b539a;
  --accfg: #fffdf5;
  --accbg: rgba(143,100,20,.07); --accline: rgba(143,100,20,.3);
  --markbg: rgba(143,100,20,.18);
  --ok: #2f7a3c; --okline: #9cc3a2;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.62 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--logic); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; line-height: 1.25; }
h1 { font-size: 2rem; margin: .2rem 0 .6rem; }
h2 { font-size: 1.35rem; margin: 1.6rem 0 .6rem; }
h3 { font-size: 1.08rem; margin: 1rem 0 .4rem; }

.topbar {
  display: flex; align-items: center; gap: 1.4rem; flex-wrap: wrap;
  padding: .8rem 1.6rem; border-bottom: 1px solid var(--line);
  background: var(--bg2); position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; gap: .7rem; align-items: baseline; color: var(--fg); }
.brand:hover { text-decoration: none; }
.brand .mark { font-family: var(--mono); color: var(--acc); font-size: 1.25rem; }
.brandtext strong { font-family: var(--serif); font-size: 1.15rem; letter-spacing: .02em; }
.brandtext em { display: block; font-size: .72rem; color: var(--fg3); font-style: normal; }
#nav { display: flex; gap: 1rem; flex-wrap: wrap; }
#nav a { color: var(--fg2); font-size: .88rem; padding: .15rem 0; border-bottom: 2px solid transparent; }
#nav a.active, #nav a:hover { color: var(--fg); border-bottom-color: var(--acc); text-decoration: none; }

main { max-width: 1060px; margin: 0 auto; padding: 2rem 1.6rem 4rem; }
.viewhead { margin-bottom: 1.6rem; }
.lede { color: var(--fg2); font-size: 1.02rem; max-width: 62rem; }
.tag {
  display: inline-block; font-size: .72rem; letter-spacing: .09em; text-transform: uppercase;
  color: var(--acc); margin-bottom: .2rem;
}
.fine { font-size: .8rem; color: var(--fg3); }
.mono { font-family: var(--mono); font-size: .92em; }
.readable { font-family: var(--serif); font-size: 1.02rem; line-height: 1.7; }

.grid { display: grid; gap: 1rem; }
.g2 { grid-template-columns: repeat(auto-fit, minmax(310px, 1fr)); }
.g3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.card, .panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 1.1rem 1.2rem;
}
.panel { margin-bottom: 1.2rem; }
.workcard { cursor: pointer; transition: border-color .15s; }
.workcard:hover { border-color: var(--acc); }
.workcard.dim { cursor: default; opacity: .75; }
.workcard.dim:hover { border-color: var(--line); }

.cite {
  font-family: var(--mono); font-size: .74rem; color: var(--acc);
  background: var(--accbg); border: 1px solid var(--accline);
  padding: .05rem .45rem; border-radius: 4px; white-space: nowrap;
}
a.cite:hover { text-decoration: none; border-color: var(--acc); }

.chip {
  font-size: .8rem; color: var(--fg2); background: none; border: 1px solid var(--line);
  border-radius: 999px; padding: .25rem .8rem; cursor: pointer; font-family: inherit;
}
.chip.on { color: var(--accfg); background: var(--acc); border-color: var(--acc); }
.chip:disabled { opacity: .4; cursor: default; }
.toolbar { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; margin: .6rem 0 1rem; }
.toolbar input[type=search] {
  background: var(--bg2); color: var(--fg); border: 1px solid var(--line); border-radius: 6px;
  padding: .5rem .8rem; font: inherit;
}
.toolbar .grow { flex: 1; min-width: 220px; }
button.primary {
  background: var(--acc); color: var(--accfg); border: none; border-radius: 6px;
  padding: .5rem 1.1rem; font: inherit; font-weight: 600; cursor: pointer;
}
.status { font-size: .7rem; letter-spacing: .06em; text-transform: uppercase; padding: .1rem .5rem;
  border-radius: 4px; border: 1px solid; }
.status.shipped { color: var(--ok); border-color: var(--okline); }
.status.planned { color: var(--fg3); border-color: var(--line); }
.status.considered { color: var(--fg3); border-color: var(--line); border-style: dashed; }
.linie-logic { border-left: 3px solid var(--logic); }
.linie-gegen { border-left: 3px solid var(--gegen); }
.linie-maschine { border-left: 3px solid var(--maschine); }
.linie-wort { border-left: 3px solid var(--wort); }

.unit { border-left: 2px solid var(--line); padding-left: .95rem; margin-bottom: 1.35rem; }
.unit .ulabel { font-size: .8rem; color: var(--acc); margin: 0 0 .2rem; font-family: var(--serif); font-style: italic; }
.unit p { margin: .2rem 0 0; }
mark { background: var(--markbg); color: inherit; padding: 0 .1em; }

table { border-collapse: collapse; width: 100%; }
td, th { padding: .3rem .6rem .3rem 0; border-bottom: 1px solid var(--line); vertical-align: top; }
.num { text-align: right; font-family: var(--mono); font-size: .85rem; }

footer {
  border-top: 1px solid var(--line); margin-top: 3rem; padding: 1.6rem;
  font-size: .78rem; color: var(--fg3); max-width: 1060px; margin-left: auto; margin-right: auto;
}
footer p { max-width: 62rem; }
@media (max-width: 640px) { h1 { font-size: 1.5rem; } main { padding: 1.2rem 1rem 3rem; } }

/* introductory essay */
.essay .readable { max-width: 46rem; margin: 0 0 1rem; }
.essay h2 { margin-top: 2.2rem; }
.refs p { font-size: .88rem; color: var(--fg2); margin: 0 0 .55rem; padding-left: 1.4rem; text-indent: -1.4rem; }

/* bilingual reader + atlas */
.readable.orig { font-style: italic; }
.readable.verse { white-space: pre-line; }
.readable.orig.rtl { font-style: normal; direction: rtl; text-align: right; }
select {
  background: var(--bg2, #1b1b22); color: var(--fg, #e9e6e0);
  border: 1px solid var(--line, #33333d); border-radius: 6px;
  padding: .35rem .6rem; font: inherit; font-size: .85rem;
}

/* ------------------------------------------------------------ timeline */
.tlwrap { overflow-x: auto; }
.tl { width: 100%; min-width: 740px; display: block; }
.tl a { cursor: pointer; }
.tl a circle { transition: r .12s; }
.tl a:hover circle { r: 8px; }

/* -------------------------------------------------------------- plates */
.plate { margin: 0 0 1.4rem; }
.plate img {
  max-width: min(100%, 460px); max-height: 560px; display: block;
  border-radius: 6px; border: 1px solid var(--line); background: #fff;
}
.plate figcaption { margin-top: .45rem; max-width: 640px; }
.platethumb {
  float: right; width: 62px; margin: 0 0 .5rem .8rem;
  border-radius: 4px; border: 1px solid var(--line); background: #fff;
}