/* Space Group Explorer — set in the idiom of International Tables Vol. A:
   a serif text face, hairline rules, no shadows, no fills that are not
   carrying information, and tables ruled only where a rule means something. */

:root{
  --paper:#fbfaf7;
  --sheet:#ffffff;
  --ink:#12141a;
  --dim:#5d6067;
  --faint:#8a8d94;
  --rule:#b9b6ad;        /* head/foot rules */
  --hair:#e3e0d8;        /* row hairlines */
  --mark:#1b3a6b;        /* the one accent: selection and links */
  --mark-tint:#e9eef7;
  --absent:#8a1c26;
  --absent-tint:#f7ecec;
  --present:#1f5c3a;
  --present-tint:#eaf2ec;

  --serif:"Charter","Bitstream Charter","Sitka Text",Cambria,"Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --measure:100%;
}

*{box-sizing:border-box}

html,body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font:16px/1.5 var(--serif);
  font-variant-numeric:tabular-nums lining-nums;
  -webkit-text-size-adjust:100%;
}
body{padding:12px 0 64px}

.sheet{max-width:var(--measure);margin:0 auto;padding:0}

h1,h2,h3,h4{margin:0;font-weight:600;letter-spacing:.005em}
p{margin:0}
button,input,select{font:inherit;color:inherit}
button{cursor:pointer}

/* ── Section heads: letterspaced small caps, the book's own device ───── */
h1,.section-head h3{
  font-size:18px;
  font-weight:700;
  letter-spacing:.1em;
  text-transform:uppercase;
  line-height:1;
}

/* ── Controls ────────────────────────────────────────────────────────── */
.btn{
  border:1px solid var(--rule);
  background:var(--sheet);
  border-radius:2px;
  padding:5px 10px;
  font-size:14px;
  line-height:1.2;
}
.btn:hover{background:var(--mark-tint);border-color:var(--mark)}
.btn.icon{width:30px;padding:5px 0;text-align:center;font-size:14px}
.btn.on{background:var(--mark-tint);border-color:var(--mark);color:var(--mark)}

:where(a,button,input,[tabindex]):focus-visible{
  outline:2px solid var(--mark);
  outline-offset:1px;
}

/* ── Finder ──────────────────────────────────────────────────────────── */
.finder{
  background:var(--sheet);
  padding:12px 16px 8px;
  margin-bottom:12px;
}
.finder-head{
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding-bottom:10px;margin-bottom:10px;border-bottom:1px solid var(--hair);
}
.finder-tools{display:flex;gap:6px}

.filter-grid{
  display:grid;
  grid-template-columns:minmax(330px,2fr) minmax(200px,1.1fr) 82px 164px;
  gap:14px;align-items:start;
}
.filter-label,.field{
  display:block;
  font-size:10px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:var(--dim);
  margin-bottom:5px;
}
.field input{
  display:block;width:100%;margin-top:5px;
  min-height:34px;padding:5px 8px;
  border:1px solid var(--rule);border-radius:2px;background:var(--sheet);
  font-size:15px;font-weight:400;letter-spacing:0;text-transform:none;color:var(--ink);
}
.field input:focus{outline:2px solid var(--mark);outline-offset:-1px;border-color:var(--mark)}
.number-field input.invalid{border-color:var(--absent);background:var(--absent-tint)}

.filter-group,.search-field,.number-field{min-width:0}
.toggle-row{display:flex;flex-wrap:wrap;gap:5px;align-items:center}
.toggle{
  border:1px solid var(--rule);background:var(--sheet);
  border-radius:2px;padding:5px 9px;font-size:13px;line-height:1.2;
}
.toggle:hover:not(:disabled){border-color:var(--mark);background:var(--mark-tint)}
.toggle.active{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.toggle:disabled{opacity:.32;cursor:default}

.chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:11px;min-height:19px}
.chip{
  font-size:11px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--mark);border-bottom:1px solid var(--mark);padding-bottom:1px;
}

/* ── Workspace ───────────────────────────────────────────────────────── */
.workspace{display:grid;grid-template-columns:272px minmax(0,1fr);gap:26px;align-items:start}

.results{
  background:var(--sheet);
  border-top:1px solid var(--ink);
  position:sticky;top:14px;max-height:calc(100vh - 28px);
  display:flex;flex-direction:column;
}
.results-head{
  padding:7px 12px;border-bottom:1px solid var(--rule);
  font-size:10px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--dim);
}
.results-head span{color:var(--ink)}
.result-list{overflow:auto}

.result{
  width:100%;display:block;text-align:left;
  border:0;border-bottom:1px solid var(--hair);background:none;
  padding:9px 12px;
}
.result:hover{background:var(--mark-tint)}
.result.active{background:var(--mark-tint);box-shadow:inset 3px 0 var(--mark)}
.result-symbol{font-size:17px;line-height:1.25}
.result-meta{color:var(--dim);font-size:12px;margin-top:2px}

/* ── The setting page: modelled on an ITC page head ──────────────────── */
.detail{min-width:0}

.page-head{
  background:var(--sheet);
  border-top:2px solid var(--ink);border-bottom:1px solid var(--ink);
  padding:12px 16px 0;
}
.head-row{
  display:flex;justify-content:space-between;align-items:baseline;gap:20px;
  padding-bottom:8px;
}
.head-symbol{font-size:36px;line-height:1.05;letter-spacing:.01em}
.head-symbol sub{font-size:.55em;line-height:0}
.head-class{text-align:right;color:var(--dim);font-size:13px;white-space:nowrap}
.head-class b{display:block;color:var(--ink);font-size:17px;font-weight:400}

.head-line{
  display:flex;flex-wrap:wrap;gap:0 18px;
  border-top:1px solid var(--hair);padding:6px 0;
  font-size:13px;color:var(--dim);
}
.head-line b{font-weight:400;color:var(--ink)}
.head-line .hall{font-family:var(--mono);font-size:12px}

/* ── Tabs: a rule with letterspaced labels sitting on it ─────────────── */
.tabs{display:flex;gap:22px;border-top:1px solid var(--rule);margin-top:2px}
.tab{
  border:0;background:none;padding:8px 0 7px;margin-bottom:-1px;
  font-size:11px;font-weight:700;letter-spacing:.13em;text-transform:uppercase;
  color:var(--faint);border-bottom:2px solid transparent;
}
.tab:hover{color:var(--ink)}
.tab.active{color:var(--ink);border-bottom-color:var(--ink)}

/* ── Blocks ──────────────────────────────────────────────────────────── */
.block{background:var(--sheet);border-bottom:1px solid var(--hair);padding:16px}
.section-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:10px}
.section-head h3{color:var(--dim)}
.section-head .hint{font-size:12px;color:var(--faint)}

/* ── Tables: booktabs. Rule above the head, under the head, at the foot. */
.table-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:15px}
thead th{
  font-size:10px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:var(--dim);text-align:left;
  padding:5px 12px 5px 0;
  border-top:1px solid var(--ink);border-bottom:1px solid var(--rule);
  white-space:nowrap;
}
tbody td{padding:6px 12px 6px 0;border-bottom:1px solid var(--hair);vertical-align:baseline}
tbody tr:last-child td{border-bottom:1px solid var(--rule)}
th:last-child,td:last-child{padding-right:0}
.num{text-align:right;padding-right:16px!important;width:1%}
.click-row{cursor:pointer}
.click-row:hover td{background:var(--mark-tint)}
tr.selected td{background:var(--mark-tint)}
tr.selected td:first-child{box-shadow:inset 3px 0 var(--mark)}

.wy-letter{font-style:italic;font-size:17px}
.sitesym{font-family:var(--serif)}
.coords{line-height:1.7}

/* ── Crystallographic typesetting: the point of the whole exercise ───── */
.ovl{text-decoration:overline;text-decoration-thickness:from-font}
.coord i,.coords i{font-style:italic}
.csep{color:var(--faint)}
.ext{color:var(--dim);font-size:.72em;letter-spacing:.04em}
.rule-str{font-family:var(--serif);white-space:nowrap}
.zone{font-style:italic}

/* ── Positions inspector ─────────────────────────────────────────────── */
.inspector{display:grid;grid-template-columns:220px minmax(0,1fr);gap:24px}
.pos-mark{font-size:30px;line-height:1.1;margin-bottom:8px}
.pos-mark i{font-style:italic}
dl.facts{display:grid;grid-template-columns:auto 1fr;gap:3px 14px;margin:0;font-size:14px}
dl.facts dt{color:var(--dim);font-size:10px;letter-spacing:.11em;text-transform:uppercase;padding-top:4px}
dl.facts dd{margin:0}
.coord-list{
  columns:220px;column-gap:26px;font-size:15px;line-height:1.85;
}
.coord-list .n{color:var(--faint);font-size:11px;margin-right:5px}
.note{color:var(--dim);font-size:13px;margin-top:12px;padding-left:11px;border-left:2px solid var(--hair)}

/* ── Reflection conditions ───────────────────────────────────────────── */
.cond-table td:first-child{width:1%;white-space:nowrap;padding-right:22px}
.hkl-entry{display:flex;gap:6px;align-items:center}
.hkl-entry input{
  width:56px;min-height:32px;text-align:center;
  border:1px solid var(--rule);border-radius:2px;background:var(--sheet);
  font-size:15px;font-style:italic;
}
.hkl-entry input:focus{outline:2px solid var(--mark);outline-offset:-1px}
.verdict{display:flex;gap:16px;align-items:baseline;padding:11px 13px;border:1px solid var(--hair);margin-bottom:12px}
.verdict.absent{background:var(--absent-tint);border-color:#e2c9cb}
.verdict.allowed{background:var(--present-tint);border-color:#c8dbcf}
.verdict-word{font-size:15px;font-weight:700;letter-spacing:.15em;text-transform:uppercase}
.absent .verdict-word{color:var(--absent)}
.allowed .verdict-word{color:var(--present)}
.verdict p{color:var(--dim);font-size:13px;margin-top:2px}
.checks{font-size:14px}
.checks td:first-child{width:1%;padding-right:10px}
.checks .no{color:var(--absent)}
.checks .yes{color:var(--present)}

/* ── Symmetry operations ─────────────────────────────────────────────── */
.sym-layout{display:grid;grid-template-columns:minmax(0,1fr) 268px;gap:24px;align-items:start}
.op-list{columns:200px;column-gap:22px;font-size:15px;line-height:1.9}
.op{
  display:block;width:100%;text-align:left;border:0;background:none;
  padding:1px 5px;border-radius:2px;break-inside:avoid;
}
.op .n{color:var(--faint);font-size:11px;margin-right:6px}
.op:hover{background:var(--mark-tint)}
.op.active{background:var(--mark-tint);box-shadow:inset 3px 0 var(--mark)}
.op-panel{border-top:1px solid var(--ink);padding-top:9px;position:sticky;top:14px}
.op-panel h4{font-size:10px;letter-spacing:.13em;text-transform:uppercase;color:var(--dim);margin:14px 0 5px}
.op-title{font-size:19px}
.aug{border-collapse:collapse;font-size:14px;width:auto}
.aug td{padding:4px 9px;text-align:right;border:0}
.aug td:nth-child(3){padding-right:11px}
.aug .tcol{border-left:1px solid var(--rule);color:var(--mark);padding-left:11px}
.aug tr:first-child td{padding-top:2px}

/* ── Empty and error states ──────────────────────────────────────────── */
.empty{
  background:var(--sheet);border-top:1px solid var(--rule);
  padding:64px 24px;text-align:center;color:var(--dim);
}
.empty h2{font-size:19px;color:var(--ink);margin-bottom:5px}
.empty p{font-size:14px;max-width:44ch;margin:0 auto}
.empty-mark{font-size:26px;color:var(--rule);margin-bottom:14px}
.empty.mini{padding:26px 16px;border:0}
.empty.mini h2{font-size:15px}
.loading{color:var(--faint);font-size:13px;letter-spacing:.1em;text-transform:uppercase}

/* ── Responsive ──────────────────────────────────────────────────────── */
@media(max-width:1080px){
  .filter-grid{grid-template-columns:1fr minmax(190px,1fr) 82px 164px}
  .bravais-group{grid-column:1/-1}
  .workspace{grid-template-columns:1fr}
  .results{position:static;max-height:none}
  .result-list{max-height:290px}
  .sym-layout,.inspector{grid-template-columns:1fr}
  .op-panel{position:static}
}
@media(max-width:640px){
  body{padding-top:14px}
  .sheet{padding:0 14px}
  .filter-grid{grid-template-columns:1fr}
  .head-row{display:block}
  .head-class{text-align:left;margin-top:6px}
  .head-symbol{font-size:30px}
  .tabs{gap:16px;overflow-x:auto}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
}

/* ── Dark mode: an inked plate rather than a lit page ────────────────── */
body.dark{
  color-scheme: dark;
  --paper:#101216;
  --sheet:#171a1f;
  --ink:#e6e5e0;
  --dim:#9b9ea6;
  --faint:#71757d;
  --rule:#3a3e46;
  --hair:#272b32;
  --mark:#5486e0;
  --mark-tint:#1d2531;
  --absent:#e2818c;
  --absent-tint:#2c1e21;
  --present:#77c79c;
  --present-tint:#18271f;
}
body.dark .toggle.active{background:var(--mark);border-color:var(--mark);color:#101216}
body.dark .verdict.absent{border-color:#4a3237}
body.dark .verdict.allowed{border-color:#2c4738}

/* ── Print: it should look like the book it borrows from ─────────────── */
@media print{
  body{background:#fff;padding:0}
  .finder,.results,.tabs,.btn{display:none}
  .workspace{display:block}
  .page-head,.block{border-color:#000}
}

/* Rule typography: the disjunctive conditions the tables use for
   diamond-type special positions, and the caveat when a set cannot be phrased */
.orword{font-style:italic;color:var(--dim);padding:0 2px}
.warn{color:var(--amber,#9a5b00);font-size:12px;margin-top:3px}
.dim{color:var(--faint)}
body.dark .warn{color:#ffaa33}