/* ═══════════════════════════════════════════
   PERIODIC TABLE — shared component
   Treated as a printed reference plate: paper ground,
   category tints held low, one gold accent, and a
   symbol-first cell built on a real typographic scale.
═══════════════════════════════════════════ */

/* One hue per category; tint, rule and text all derive from it. */
:root{
  --c-alkali:        28 62% 52%;
  --c-alkaline:      45 58% 48%;
  --c-transition:    8 50% 60%;
  --c-post:          205 36% 56%;
  --c-metalloid:     175 40% 44%;
  --c-nonmetal:      142 40% 45%;
  --c-halogen:       225 46% 63%;
  --c-noble:         280 36% 61%;
  --c-lanthanide:    38 44% 53%;
  --c-actinide:      345 44% 59%;
  --c-unknown:       35 8% 55%;

  --pt-tint: 26%;
  --pt-tint-hover: 46%;
  --pt-rule: 52%;
  --pt-scrim: rgba(24,20,15,0.55);
  --pt-plate: #fdfbf7;
}
[data-theme="dark"]{
  --c-alkali:        28 60% 60%;
  --c-alkaline:      45 56% 58%;
  --c-transition:    8 48% 64%;
  --c-post:          205 40% 62%;
  --c-metalloid:     175 42% 52%;
  --c-nonmetal:      142 40% 54%;
  --c-halogen:       225 50% 70%;
  --c-noble:         280 40% 68%;
  --c-lanthanide:    38 46% 60%;
  --c-actinide:      345 46% 66%;
  --c-unknown:       35 10% 62%;

  --pt-tint: 22%;
  --pt-tint-hover: 40%;
  --pt-rule: 46%;
  --pt-scrim: rgba(0,0,0,0.72);
  --pt-plate: #15120e;
}

.cat-alkali-metal{--cat:var(--c-alkali)}
.cat-alkaline-earth{--cat:var(--c-alkaline)}
.cat-transition-metal{--cat:var(--c-transition)}
.cat-post-transition{--cat:var(--c-post)}
.cat-metalloid{--cat:var(--c-metalloid)}
.cat-nonmetal{--cat:var(--c-nonmetal)}
.cat-halogen{--cat:var(--c-halogen)}
.cat-noble-gas{--cat:var(--c-noble)}
.cat-lanthanide{--cat:var(--c-lanthanide)}
.cat-actinide{--cat:var(--c-actinide)}
.cat-unknown{--cat:var(--c-unknown)}

/* ═══════════ Launcher ═══════════ */
.pt-fab{
  position:fixed;right:26px;bottom:26px;z-index:900;
  display:inline-flex;align-items:center;gap:12px;
  padding:0 22px 0 17px;height:54px;
  border:1px solid var(--line);border-radius:3px;
  background:var(--card-bg);color:var(--ink);cursor:pointer;
  box-shadow:var(--shadow);overflow:hidden;
  transition:border-color .3s var(--ease), box-shadow .3s var(--ease),
             transform .3s var(--ease-out);
}
.pt-fab::before{
  content:'';position:absolute;left:0;top:0;bottom:0;width:2px;
  background:var(--gold-ui);transform:scaleY(0);transform-origin:bottom;
  transition:transform .35s var(--ease-out);
}
.pt-fab:hover{transform:translateY(-2px);border-color:var(--gold-ui);box-shadow:var(--shadow2)}
.pt-fab:hover::before{transform:scaleY(1);transform-origin:top}
.pt-fab:active{transform:translateY(0)}
.pt-fab-mark{width:20px;height:20px;flex-shrink:0;color:var(--gold-ui)}
.pt-fab-mark rect{transition:opacity .3s var(--ease)}
.pt-fab:hover .pt-fab-mark rect:nth-child(2),
.pt-fab:hover .pt-fab-mark rect:nth-child(3){opacity:1}
.pt-fab-text{display:flex;flex-direction:column;align-items:flex-start;line-height:1.15}
.pt-fab-label{font-family:var(--serif);font-size:1rem;font-weight:700}
.pt-fab-sub{font-family:var(--mono);font-size:9px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink3)}
@media(max-width:720px){
  .pt-fab{right:16px;bottom:16px;height:48px;padding:0 16px 0 13px;gap:9px}
  .pt-fab-sub{display:none}
}
body.nav-open .pt-fab{
  opacity:0;visibility:hidden;transform:translateY(8px);pointer-events:none;
  transition:opacity .2s var(--ease), visibility .2s, transform .2s var(--ease);
}

/* ═══════════ Dialog ═══════════ */
/* [hidden] MUST win. A class selector beats the UA sheet's [hidden]{display:none},
   which previously left the closed dialog invisible but still covering the
   viewport and swallowing every click — the page looked frozen. */
.pt-overlay[hidden]{display:none!important}
.pt-overlay{
  position:fixed;inset:0;z-index:950;
  display:flex;align-items:center;justify-content:center;
  padding:clamp(10px,2.5vw,36px);
  background:var(--pt-scrim);backdrop-filter:blur(5px);
  opacity:0;pointer-events:none;
  transition:opacity .3s var(--ease);
}
.pt-overlay.open{opacity:1;pointer-events:auto}

.pt-panel{
  position:relative;
  width:min(1300px,100%);max-height:min(95vh,960px);
  display:flex;flex-direction:column;
  background:var(--pt-plate);
  border:1px solid var(--line);border-radius:4px;
  box-shadow:var(--shadow2);overflow:hidden;
  opacity:0;transform:translateY(10px) scale(.99);
  transition:opacity .32s var(--ease), transform .46s var(--ease-out);
}
.pt-overlay.open .pt-panel{opacity:1;transform:none}

/* ── Header: title left, hint + close right ── */
.pt-header{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:20px 26px;border-bottom:1px solid var(--line);flex-shrink:0;
}
.pt-titles{display:flex;flex-direction:column;gap:3px;min-width:0}
.pt-title{
  font-family:var(--serif);font-weight:700;
  font-size:clamp(1.2rem,1.05rem+.5vw,1.5rem);
  color:var(--ink);line-height:1.1;letter-spacing:-.01em;
}
.pt-sub{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--ink3);
}
.pt-header-right{display:flex;align-items:center;gap:14px}
.pt-hint{
  font-family:var(--mono);font-size:10px;letter-spacing:.08em;
  color:var(--ink3);white-space:nowrap;
}
.pt-close{
  width:36px;height:36px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  border:1px solid var(--line);border-radius:3px;
  background:transparent;color:var(--ink2);cursor:pointer;
  transition:var(--trans);
}
.pt-close:hover{background:var(--ink);border-color:var(--ink);color:var(--pt-plate)}
.pt-close svg{width:13px;height:13px}

/* ── Body ── */
.pt-body{
  overflow:auto;padding:22px 26px 10px;
  -webkit-overflow-scrolling:touch;flex:1;min-height:0;
}

/* Group / period axis labels give the plate its reference-chart feel. */
.pt-scroll{min-width:1080px}
.pt-axis{
  display:grid;grid-template-columns:repeat(18,minmax(0,1fr));
  gap:5px;margin-bottom:8px;padding-left:26px;align-items:end;
}
.pt-axis span{
  display:flex;flex-direction:column;align-items:center;gap:1px;
  font-family:var(--mono);color:var(--ink3);letter-spacing:.04em;
}
.pt-axis span b{font-size:10px;font-weight:600;color:var(--ink2)}
.pt-axis span i{font-size:7px;font-style:normal;opacity:.85;white-space:nowrap}
.pt-rows{display:flex;gap:6px}
.pt-periods{
  display:grid;grid-auto-rows:minmax(0,1fr);gap:5px;
  width:20px;flex-shrink:0;
}
.pt-periods span{
  display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:9px;color:var(--ink3);
}
.pt-grid{
  display:grid;grid-template-columns:repeat(18,minmax(0,1fr));
  grid-auto-rows:minmax(0,1fr);gap:5px;flex:1;min-width:0;
}
.pt-fblock{margin-top:16px;padding-left:26px}

/* ── Cell ──
   Four registers, each in its own type role: number (mono, quiet),
   symbol (serif, loud, coloured by state), name, mass. */
.pt-cell{
  position:relative;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  aspect-ratio:1;padding:3px 2px;gap:0;
  border:1px solid hsl(var(--cat) / var(--pt-rule));
  border-radius:3px;
  background:
    linear-gradient(160deg, hsl(var(--cat) / calc(var(--pt-tint) + 10%)) 0%,
                            hsl(var(--cat) / var(--pt-tint)) 58%);
  color:var(--ink);cursor:pointer;overflow:hidden;
  transition:transform .18s var(--ease-out), box-shadow .18s var(--ease),
             border-color .18s var(--ease), background .18s var(--ease);
}
/* top sheen — reads as printed stock, not a glossy button */
.pt-cell::after{
  content:'';position:absolute;inset:0 0 auto 0;height:38%;
  background:linear-gradient(#fff, transparent);opacity:.22;pointer-events:none;
}
[data-theme="dark"] .pt-cell::after{opacity:.07}

.pt-z{
  position:absolute;top:3px;left:5px;
  font-family:var(--mono);font-size:9.5px;line-height:1;
  color:var(--ink2);opacity:.8;font-variant-numeric:tabular-nums;
}
.pt-sym{
  font-family:var(--serif);font-weight:700;
  font-size:clamp(16px,1.6vw,23px);line-height:1;
  letter-spacing:-.02em;margin-top:7px;
}
.pt-name{
  font-family:var(--sans);font-size:9px;line-height:1.15;
  color:var(--ink2);opacity:.9;margin-top:3px;
  max-width:100%;padding:0 2px;text-align:center;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.pt-name.is-long{font-size:7.6px;letter-spacing:-.02em}
.pt-mass{
  font-family:var(--mono);font-size:8px;line-height:1;
  color:var(--ink3);margin-top:3px;font-variant-numeric:tabular-nums;
}

/* State is carried by the symbol's colour — the one convention every
   printed periodic table uses. */
.st-solid   .pt-sym{color:var(--ink)}
.st-liquid  .pt-sym{color:#1c6fb8}
.st-gas     .pt-sym{color:#b8342a}
.st-unknown .pt-sym{color:var(--ink3);opacity:.75}
[data-theme="dark"] .st-liquid .pt-sym{color:#6fb7f0}
[data-theme="dark"] .st-gas    .pt-sym{color:#f08a7e}

.pt-cell:hover{
  background:hsl(var(--cat) / var(--pt-tint-hover));
  border-color:hsl(var(--cat));
  transform:translateY(-3px) scale(1.04);
  box-shadow:0 6px 18px hsl(var(--cat) / .3), var(--shadow);
  z-index:5;
}
.pt-cell.selected{
  background:hsl(var(--cat) / var(--pt-tint-hover));
  border-color:hsl(var(--cat));
  box-shadow:0 0 0 2px var(--pt-plate), 0 0 0 4px hsl(var(--cat)), var(--shadow2);
  transform:translateY(-2px);z-index:6;
}

/* f-block pointer cells */
.pt-marker{
  display:flex;align-items:center;justify-content:center;aspect-ratio:1;
  border:1px dashed hsl(var(--cat) / .55);border-radius:3px;
  background:hsl(var(--cat) / calc(var(--pt-tint) * .45));
  font-family:var(--mono);font-size:8.5px;color:var(--ink2);letter-spacing:.02em;
}

/* ── Key, sitting in the d-block gap ── */
.pt-key{
  grid-column:4 / 13;grid-row:1 / 4;
  display:flex;align-items:center;gap:16px;
  padding:12px 16px;margin:0 2px;
  border:1px solid var(--line);border-radius:4px;
  background:var(--card-bg);box-shadow:var(--shadow);
}
.pt-key-sample{
  position:relative;flex-shrink:0;
  width:74px;aspect-ratio:1;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  border:1px solid var(--gold-ui);border-radius:3px;
  background:linear-gradient(160deg, rgba(var(--accent-rgb),.2), rgba(var(--accent-rgb),.08));
}
.pt-key-sample .pt-z{font-size:9px;opacity:1;color:var(--gold)}
.pt-key-sample .pt-sym{font-size:22px;color:var(--ink);margin-top:8px}
.pt-key-sample .pt-name{font-size:8px;opacity:1}
.pt-key-sample .pt-mass{font-size:7.5px}

.pt-key-notes{display:flex;flex-direction:column;gap:6px;min-width:0}
.pt-key-title{
  font-family:var(--mono);font-size:9px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink3);
}
.pt-key-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.pt-key-list li{
  font-family:var(--sans);font-size:10.5px;color:var(--ink2);line-height:1.4;
}
.pt-key-list b{font-family:var(--mono);color:var(--gold);font-weight:600;margin-right:3px}

.pt-states{display:flex;flex-wrap:wrap;gap:5px 12px;margin-top:3px}
.pt-states span{
  display:inline-flex;align-items:center;gap:5px;
  font-family:var(--mono);font-size:9.5px;color:var(--ink2);
}
.pt-states i{
  font-style:normal;font-family:var(--serif);font-weight:700;font-size:12px;
  min-width:16px;text-align:center;
}
.pt-states .st-solid   i{color:var(--ink)}
.pt-states .st-liquid  i{color:#1c6fb8}
.pt-states .st-gas     i{color:#b8342a}
.pt-states .st-unknown i{color:var(--ink3);opacity:.75}
[data-theme="dark"] .pt-states .st-liquid i{color:#6fb7f0}
[data-theme="dark"] .pt-states .st-gas    i{color:#f08a7e}

/* ── Legend ── */
.pt-legend{
  display:flex;flex-wrap:wrap;gap:7px 18px;
  padding:15px 26px 17px;border-top:1px solid var(--line);flex-shrink:0;
}
.pt-leg{
  display:inline-flex;align-items:center;gap:7px;
  font-family:var(--mono);font-size:9.5px;color:var(--ink2);letter-spacing:.03em;
}
.pt-swatch{
  width:9px;height:9px;border-radius:2px;
  background:hsl(var(--cat) / .5);border:1px solid hsl(var(--cat) / .85);
}

/* ═══════════ Element record ═══════════ */
.pt-detail{
  position:absolute;inset:auto 0 0 0;
  background:var(--card-bg);
  border-top:1px solid var(--line);
  box-shadow:0 -16px 44px rgba(0,0,0,.18);
  transform:translateY(101%);
  transition:transform .44s var(--ease-out);
  max-height:66%;overflow:auto;
}
.pt-detail.show{transform:translateY(0)}
/* Category hairline ties the record to the cell without a coloured slab. */
.pt-detail::before{
  content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:hsl(var(--cat));
}

.pt-detail-inner{
  display:grid;grid-template-columns:auto 1fr;gap:28px;
  padding:26px 30px 28px;align-items:start;
}

/* The plate mirrors a printed element tile. */
.pt-plate-card{
  width:148px;flex-shrink:0;
  border:1px solid hsl(var(--cat) / .55);border-radius:3px;
  background:hsl(var(--cat) / var(--pt-tint));
  padding:14px 16px 16px;
  display:flex;flex-direction:column;
}
.pt-plate-top{
  display:flex;align-items:baseline;justify-content:space-between;
  font-family:var(--mono);font-size:10.5px;color:var(--ink2);
  padding-bottom:9px;border-bottom:1px solid hsl(var(--cat) / .3);
}
.pt-plate-sym{
  font-family:var(--serif);font-weight:900;font-size:3.6rem;line-height:1;
  color:var(--ink);letter-spacing:-.025em;margin:12px 0 6px;
}
.pt-plate-name{
  font-family:var(--sans);font-size:12px;color:var(--ink2);line-height:1.25;
}

.pt-detail-main{min-width:0}
.pt-detail-name{
  font-family:var(--serif);font-weight:700;
  font-size:clamp(1.6rem,1.3rem+1.1vw,2.15rem);
  color:var(--ink);line-height:1.08;letter-spacing:-.015em;
}
.pt-detail-cat{
  display:inline-flex;align-items:center;gap:7px;margin-top:9px;
  font-family:var(--mono);font-size:10px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink2);
}
.pt-detail-cat::before{content:'';width:16px;height:2px;background:hsl(var(--cat))}

.pt-facts{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));
  gap:0 32px;margin-top:20px;
}
.pt-fact{
  display:flex;align-items:baseline;justify-content:space-between;gap:14px;
  padding:12px 0;border-bottom:1px solid var(--line2);
}
.pt-fact-label{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--ink3);white-space:nowrap;
}
.pt-fact-value{
  font-family:var(--mono);font-size:var(--fs-base);color:var(--ink);
  text-align:right;font-variant-numeric:tabular-nums;
}

/* Configuration gets its own full-width band — it is the reason to open this. */
.pt-config-row{
  grid-column:1/-1;border-bottom:none;display:block;
  margin-top:16px;padding:15px 18px;
  background:hsl(var(--cat) / calc(var(--pt-tint) * .7));
  border:1px solid hsl(var(--cat) / .28);border-radius:3px;
}
.pt-config-label{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--ink3);display:block;margin-bottom:9px;
}
.pt-config{
  font-family:var(--mono);font-size:clamp(1.05rem,.95rem+.45vw,1.3rem);
  color:var(--ink);line-height:1.45;word-spacing:.35em;display:block;
}
.pt-config .pt-core{color:var(--gold);font-weight:600}

.pt-detail-close{
  position:absolute;top:16px;right:18px;
  width:30px;height:30px;
  display:flex;align-items:center;justify-content:center;
  border:1px solid var(--line);border-radius:3px;
  background:var(--pt-plate);color:var(--ink3);cursor:pointer;
  transition:var(--trans);
}
.pt-detail-close:hover{background:var(--ink);border-color:var(--ink);color:var(--pt-plate)}
.pt-detail-close svg{width:11px;height:11px}

/* ── Responsive ── */
@media(max-width:900px){
  .pt-header{padding:16px 18px}
  .pt-hint{display:none}
  .pt-body{padding:16px 18px 8px}
  .pt-legend{padding:13px 18px 15px;gap:6px 13px}
  .pt-detail-inner{grid-template-columns:1fr;gap:18px;padding:22px 20px}
  .pt-plate-card{width:100%;flex-direction:row;align-items:center;gap:18px;padding:14px 18px}
  .pt-plate-top{flex-direction:column;align-items:flex-start;gap:3px;border:none;padding:0}
  .pt-plate-sym{font-size:2.6rem;margin:0}
  .pt-plate-name{display:none}
}
@media(max-width:600px){
  .pt-overlay{padding:0}
  .pt-panel{width:100%;height:100dvh;max-height:100dvh;border:none;border-radius:0}
  .pt-sub{display:none}
  .pt-detail{max-height:74%}
  .pt-facts{grid-template-columns:1fr;gap:0}
}

/* The menu button sits above the dialog in the stack; it must step aside while
   a modal is up, or it overlaps the panel header on small screens. */
body.pt-open .hamburger{opacity:0;visibility:hidden;pointer-events:none;transition:opacity .2s var(--ease),visibility .2s}

/* Long title needs room on narrow panels. */
@media(max-width:600px){
  .pt-title{font-size:1.05rem;line-height:1.2}
  .pt-header{padding:14px 16px;gap:12px}
}