/* The looks of the website's reading pages (made by tools/build-site.mjs). They borrow the game's colours and fonts,
   but are laid out for reading: one column of text with the headings in the margin, and thin lines between the sections
   instead of boxes. */
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:600;font-display:swap;src:url(/vendor/fonts/chakra-petch-latin-600-normal.woff2) format("woff2");}
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:700;font-display:swap;src:url(/vendor/fonts/chakra-petch-latin-700-normal.woff2) format("woff2");}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:400;font-display:swap;src:url(/vendor/fonts/ibm-plex-sans-latin-400-normal.woff2) format("woff2");}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:600;font-display:swap;src:url(/vendor/fonts/ibm-plex-sans-latin-600-normal.woff2) format("woff2");}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:500;font-display:swap;src:url(/vendor/fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2");}
/* More letters, fetched only by a page that shows them: "latin-ext" for Polish, "cyrillic" for Ukrainian (whose
   headings use IBM Plex Sans, as Chakra Petch has no Cyrillic). Chinese, Japanese, Hindi and Urdu use the device's fonts. */
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:600;font-display:swap;src:url(/vendor/fonts/chakra-petch-latin-ext-600-normal.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;}
@font-face{font-family:"Chakra Petch";font-style:normal;font-weight:700;font-display:swap;src:url(/vendor/fonts/chakra-petch-latin-ext-700-normal.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:400;font-display:swap;src:url(/vendor/fonts/ibm-plex-sans-latin-ext-400-normal.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:600;font-display:swap;src:url(/vendor/fonts/ibm-plex-sans-latin-ext-600-normal.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:400;font-display:swap;src:url(/vendor/fonts/ibm-plex-sans-cyrillic-400-normal.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;}
@font-face{font-family:"IBM Plex Sans";font-style:normal;font-weight:600;font-display:swap;src:url(/vendor/fonts/ibm-plex-sans-cyrillic-600-normal.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:500;font-display:swap;src:url(/vendor/fonts/ibm-plex-mono-latin-ext-500-normal.woff2) format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:500;font-display:swap;src:url(/vendor/fonts/ibm-plex-mono-cyrillic-500-normal.woff2) format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116;}
:root{
  --space:#0B1026; --space-2:#141B3A; --line:rgba(150,170,255,.2);
  --ink:#E8ECFF; --soft:#C3CAEC; --muted:#8C95C4; --accent:#FFC857;
  --display:"Chakra Petch","IBM Plex Sans","Trebuchet MS",system-ui,sans-serif;
  --body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  --pad:clamp(18px,4.5vw,48px);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:16px}
body{margin:0;color:var(--ink);font:17px/1.65 var(--body);
  background:var(--space) radial-gradient(1200px 520px at 78% -140px,rgba(70,96,220,.3),transparent 70%) no-repeat}
a{color:inherit;text-decoration-color:var(--accent);text-decoration-thickness:1.5px;text-underline-offset:3px}
a:hover{color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
img{max-width:100%;height:auto;display:block}
b{font-weight:600}
.skip{position:absolute;inset-inline-start:-999px;top:8px;background:var(--accent);color:#1A1405;padding:8px 12px;border-radius:8px;font-weight:600;text-decoration:none;z-index:5}
.skip:focus{inset-inline-start:8px}

/* the band across the top: the name, the pages, the other language and the way into the game */
.top,main,.foot{max-width:1160px;margin:0 auto;padding-left:var(--pad);padding-right:var(--pad)}
.top{display:flex;flex-wrap:wrap;align-items:center;gap:10px 28px;padding-top:18px;padding-bottom:14px}
.mark{font:700 23px/1 var(--display);color:#fff;text-decoration:none;letter-spacing:.01em;text-shadow:0 0 22px rgba(255,200,87,.35)}
.nav{display:flex;flex-wrap:wrap;gap:2px 20px;flex:1 1 100%;order:3;font-size:15px}
@media (min-width:1000px){.nav{flex:1 1 auto;order:0}}
.nav a{color:var(--soft);text-decoration:none;padding:6px 0;border-bottom:2px solid transparent}
.nav a:hover{color:#fff}
.nav a[aria-current]{color:#fff;border-bottom-color:var(--accent)}
.top-r{display:flex;align-items:center;gap:16px;margin-inline-start:auto}
/* the list of languages: a small menu that opens without any script */
.langs{position:relative;font-size:14px}
.langs summary{list-style:none;display:flex;align-items:center;gap:6px;cursor:pointer;color:var(--soft);padding:8px 2px}
.langs summary::-webkit-details-marker{display:none}
.langs summary:hover,.langs[open] summary{color:#fff}
.langs-list{position:absolute;z-index:6;top:calc(100% + 6px);inset-inline-end:0;width:max-content;max-width:calc(100vw - 2*var(--pad));display:grid;grid-template-columns:repeat(2,minmax(0,auto));column-gap:22px;
  background:#12183C;border:1px solid var(--line);border-radius:14px;padding:8px 16px;box-shadow:0 18px 60px rgba(0,0,0,.5)}
.langs-list a{padding:9px 2px;color:var(--ink);text-decoration:none;border-bottom:1px solid rgba(150,170,255,.12);white-space:nowrap}
.langs-list a:hover{color:#fff}
.langs-list a[aria-current]{color:var(--accent);font-weight:600}
.btn{display:inline-block;background:var(--accent);color:#1A1405;font:600 16px/1.1 var(--body);padding:14px 22px;border-radius:10px;text-decoration:none;border:1.5px solid var(--accent)}
.btn:hover{color:#1A1405;background:#FFD67E;border-color:#FFD67E}
.btn.ghost{background:transparent;color:var(--ink);border-color:rgba(232,236,255,.4)}
.btn.ghost:hover{color:#fff;background:rgba(232,236,255,.08);border-color:var(--ink)}
.btn.sm{padding:10px 16px;font-size:15px}

/* the top of a page */
.k{margin:0 0 12px;font:500 13px/1.2 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}
h1{margin:0;font:700 clamp(32px,6.4vw,66px)/1.03 var(--display);letter-spacing:-.01em;color:#fff;text-wrap:balance;overflow-wrap:break-word;hyphens:auto}
.lead{margin:20px 0 0;font-size:clamp(18px,2.1vw,21px);line-height:1.55;color:var(--soft);max-width:60ch}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin:28px 0 0}
.head{padding:clamp(28px,6vw,64px) 0 clamp(30px,5vw,52px);max-width:900px}
.hero{display:grid;grid-template-columns:minmax(0,1fr);gap:32px;align-items:center;padding:clamp(24px,5vw,56px) 0 clamp(30px,5vw,56px)}
.hero-fig{margin:0;justify-self:center;width:min(280px,72vw)}
.hero-fig img,.figs img,.wide img{border-radius:18px;border:1.5px solid rgba(150,170,255,.3)}
.hero-fig img{border-radius:26px;box-shadow:0 30px 90px rgba(60,90,255,.28)}
@media (min-width:820px){
  .hero{grid-template-columns:minmax(0,1fr) 300px;gap:56px}
  .hero-fig{width:300px}
}

/* the numbers under the top of the front page */
.facts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));margin:0;border-top:1px solid var(--line)}
.facts div{padding-block:20px;padding-inline-end:16px}
.facts dt{font:700 clamp(26px,5vw,48px)/1.05 var(--display);color:var(--accent);overflow-wrap:anywhere}
.facts div{min-width:0}
.facts dd{overflow-wrap:anywhere;hyphens:auto;margin:8px 0 0;color:var(--soft);font-size:15px;line-height:1.35}
@media (min-width:720px){.facts{grid-template-columns:repeat(4,minmax(0,1fr))}}

/* a section: on a wide screen the heading stands in the margin and the text beside it */
.sec{padding:clamp(26px,4vw,44px) 0;border-top:1px solid var(--line);display:grid;grid-template-columns:minmax(0,1fr);gap:12px}
.sec h2{overflow-wrap:break-word;hyphens:auto;margin:0;font:600 clamp(22px,2.6vw,27px)/1.18 var(--display);color:#fff;text-wrap:balance}
.sec h2 small{display:block;margin-top:8px;font:500 12.5px/1.4 var(--mono);letter-spacing:.04em;color:var(--muted)}
.sec-b{max-width:66ch;min-width:0}
.sec-b>:first-child{margin-top:0}
.sec-b>:last-child{margin-bottom:0}
.sec-b p{margin:0 0 14px}
@media (min-width:900px){
  .sec{grid-template-columns:minmax(0,270px) minmax(0,1fr);gap:0 56px}
  .sec h2{position:sticky;top:20px;align-self:start}
}
.sec-b ul,.sec-b ol{margin:0 0 14px;padding:0;list-style:none}
.sec-b li{position:relative;padding-inline-start:26px;margin:0 0 9px}
/* list marks: a small ring, like an electron */
.sec-b ul li::before{content:"";position:absolute;inset-inline-start:3px;top:.6em;width:9px;height:9px;border-radius:50%;border:2px solid var(--accent)}
.sec-b ol{counter-reset:step}
.sec-b ol li{counter-increment:step;padding-inline-start:34px}
.sec-b ol li::before{content:counter(step);position:absolute;inset-inline-start:0;top:0;font:500 15px/calc(17px*1.65) var(--mono);color:var(--accent)}
.more{margin:18px 0 0!important;display:flex;flex-wrap:wrap;gap:8px 22px}
.more a{color:var(--accent);font-weight:600;text-decoration:none}
.more a::after{content:" →"}
.more a:hover{color:#FFD67E;text-decoration:underline}
.note{color:var(--muted);font-size:15px;max-width:74ch;margin:18px 0 30px}

/* pictures from the game */
.figs{display:grid;gap:16px;margin:6px 0 18px;align-items:start}
.figs.n1{grid-template-columns:minmax(0,260px)}
.figs.n2{grid-template-columns:repeat(2,minmax(0,230px))}
.figs.n3{grid-template-columns:repeat(3,minmax(0,1fr))}
.figs figure,.wide{margin:0;min-width:0}
.figs img{width:100%;border-radius:14px}
figcaption{overflow-wrap:anywhere;hyphens:auto;margin-top:8px;font-size:13.5px;line-height:1.4;color:var(--muted)}
.wide{margin:0 0 clamp(28px,5vw,48px)}
.wide img{width:100%}

/* the elements: the table as a map, then a list for each period */
.pt{display:grid;grid-template-columns:repeat(18,minmax(0,1fr));grid-template-rows:repeat(7,auto) 10px auto auto;gap:3px;margin:0 0 18px}
.pt a{aspect-ratio:1;display:grid;place-content:center;text-align:center;text-decoration:none;border-radius:5px;line-height:1;
  background:rgba(150,170,255,.1);border:1px solid rgba(150,170,255,.35);
  background:color-mix(in srgb,var(--g) 22%,transparent);border-color:color-mix(in srgb,var(--g) 62%,transparent)}
.pt a:hover,.pt a:focus-visible{background:var(--g);color:#0B1026}
.pt b{font:600 clamp(8px,1.75vw,19px)/1 var(--display)}
.pt small{display:none;font:500 10px/1 var(--mono);color:var(--soft);margin-bottom:3px}
.pt a:hover small{color:#0B1026}
@media (min-width:860px){.pt{gap:5px}.pt a{border-radius:7px}.pt small{display:block}}
.legend{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px 20px;font-size:14px;color:var(--soft)}
.legend li{display:flex;align-items:center;gap:8px}
.legend li::before{content:"";width:12px;height:12px;border-radius:3px;background:var(--g)}
.els-sec{grid-template-columns:minmax(0,1fr)!important;gap:18px!important}
.els-sec h2{position:static!important}
.els-sec .sec-b{max-width:none}
.els{width:100%;border-collapse:collapse;font-size:15px;line-height:1.45}
.els th,.els td{text-align:start;vertical-align:top;padding-block:9px;padding-inline-end:14px;border-bottom:1px solid rgba(150,170,255,.12)}
.els thead th{font:500 12px/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);border-bottom-color:var(--line);white-space:nowrap}
.els tbody th{font-weight:600;color:#fff}
.els .z{font-family:var(--mono);color:var(--muted)}
.els .sym{font:700 18px/1.3 var(--display);color:var(--g)}
.els .grp,.els .sh,.els .iso{color:var(--soft)}
.els .sh,.els .iso{white-space:nowrap}
.els .fact{min-width:22ch}
.els tr:target{background:rgba(255,200,87,.1);box-shadow:-10px 0 0 rgba(255,200,87,.1),inset 3px 0 0 var(--accent)}
/* on a narrow screen each element becomes a few lines instead of a table row */
@media (max-width:820px){
  .els,.els tbody{display:block}
  .els thead{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
  .els tr{display:grid;grid-template-columns:auto auto minmax(0,1fr);gap:0 10px;align-items:baseline;padding:12px 0;border-bottom:1px solid rgba(150,170,255,.12)}
  .els th,.els td{padding:0;border:0;white-space:normal!important}
  .els .grp,.els .sh,.els .iso,.els .fact{grid-column:1/-1}
  .els .grp{font-size:14px;margin-top:2px}
  .els .sh,.els .iso{font-size:14px}
  .els .sh::before{content:attr(data-l) " ";color:var(--muted)}
  .els .fact{margin-top:6px}
}

.foot{margin-top:clamp(30px,6vw,70px);padding-top:26px;padding-bottom:44px;border-top:1px solid var(--line);color:var(--muted);font-size:14.5px}
.foot p{margin:0 0 12px;max-width:70ch}
.foot-l{display:flex;flex-wrap:wrap;gap:6px 22px;max-width:none!important}
.foot-l a{color:var(--soft);text-decoration:none}
.foot-l a:hover{color:#fff;text-decoration:underline}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{body{background:#fff;color:#000}.top .nav,.top-r,.cta,.foot-l{display:none}h1,.sec h2,.els tbody th,.mark{color:#000;text-shadow:none}.lead,.sec-b,.facts dd{color:#222}}
/* Right-to-left languages (Urdu): the periodic table keeps group 1 on the left, and "read more" arrows turn round. */
.pt,.els .sym,.els .z,.els .sh{direction:ltr}
[dir=rtl] .more a::after{content:" ←"}
[dir=rtl] .els .sh{text-align:end}
/* Chinese and Japanese headings: no negative letter spacing, a little more air */
:lang(zh) h1,:lang(ja) h1,:lang(hi) h1,:lang(ur) h1{letter-spacing:0;line-height:1.2}
:lang(hi),:lang(ur){line-height:1.8}
/* Urdu letters join each other: no extra space between letters, anywhere. */
[lang=ur] *{letter-spacing:0!important}

/* the front page offers a reader's own language (see langHint in tools/build-site.mjs) */
.lang-hint{max-width:1160px;margin:4px auto 0;padding:0 var(--pad);font-size:15px}
.lang-hint a{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border:1px solid var(--line);border-radius:999px;color:var(--ink);text-decoration:none}
.lang-hint a:hover{color:#fff;border-color:var(--accent)}