@charset "UTF-8";
:root{font-family:"Segoe UI","PingFang SC","Microsoft JhengHei","Microsoft YaHei",sans-serif;color:#28312e;background:#f1f3f2;font-synthesis:none;--ink:#28312e;--muted:#78817e;--accent:#af8850;--cell:72px;--gap:10px}
*{box-sizing:border-box}body{margin:0}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid #947044;outline-offset:5px}button{touch-action:manipulation}button:disabled{cursor:default;opacity:.3}button::-moz-focus-inner{border:0}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.viewport{height:calc(100svh - 80px);min-height:260px;position:relative;overflow:hidden;touch-action:none;background:radial-gradient(ellipse at 24% 4%,#fff 0,rgba(255,255,255,.25) 38%,transparent 60%),radial-gradient(ellipse at 87% 16%,#fff 0,transparent 45%),linear-gradient(100deg,#e5e9e8 0%,#f8f9f8 27%,#ecefee 67%,#f6f7f6 100%)}
.viewport::after{content:"";position:absolute;bottom:0;left:0;right:0;height:19px;pointer-events:none;background:linear-gradient(#b8c0bd66 0,#fff 2px,#e8ebea 3px,#d8dedb00 100%)}
.scene{position:absolute;width:1600px;height:950px;transform-origin:0 0;will-change:transform;user-select:none;-webkit-user-select:none}.scene::before{content:"";position:absolute;inset:-120px -80px 0;pointer-events:none;background:linear-gradient(111deg,transparent 28%,#ffffff48 29%,#ffffff05 55%,transparent 57%)}
.wall-heading{position:absolute;left:300px;top:53px;width:625px}.eyebrow{font-size:12px;font-weight:500;letter-spacing:3.5px;margin:0 0 21px;color:#6d7872}.wall-heading h1{font-weight:300;font-size:50px;line-height:1.24;letter-spacing:5px;margin:0 0 24px}.wall-heading p:last-child{font-size:16px;letter-spacing:2.6px;font-weight:300;margin:0;color:#68736d}.wall-heading.english h1{font-size:44px;letter-spacing:-.7px;max-width:560px}.wall-note{position:absolute;left:1180px;top:49px;color:#65716a;font-size:15px;letter-spacing:1.4px;line-height:1.9;font-weight:300}.wall-note::after{content:"";display:block;width:38px;border-top:1px solid #79867d;margin-top:16px}
.element-grid{position:absolute;left:62px;top:165px;display:grid;grid-template-columns:repeat(18,var(--cell));grid-template-rows:repeat(7,var(--cell)) 25px repeat(2,var(--cell));gap:var(--gap)}
.exhibit{position:relative;width:72px;height:72px;margin:0;padding:0;border:1px solid rgba(146,161,157,.37);border-radius:3px;background:linear-gradient(127deg,rgba(255,255,255,.58),rgba(255,255,255,.06) 43%,rgba(226,234,230,.10) 70%,rgba(255,255,255,.35));box-shadow:inset 1px 1px 1px #fff,inset -1px -1px 1px #ffffffcc,2px 3px 2px #65787022,5px 14px 9px #324e4215,7px 25px 21px #233f3314;transition:transform .25s,box-shadow .25s,border-color .25s;isolation:isolate}
.exhibit::before{content:"";position:absolute;inset:4px;border:1px solid #fafffdc4;border-radius:1px;box-shadow:-2px -2px 1px #b2bcb647,2px 2px 1px #9caaa042,inset 1px 1px 3px #ffffffa8;pointer-events:none;z-index:3}
.exhibit::after{content:"";position:absolute;inset:0;pointer-events:none;border-radius:3px;background:linear-gradient(131deg,#fff 0,transparent 5%,transparent 91%,#ffffffed 98%,#fff 100%);z-index:4}.glass-side{position:absolute;top:5px;bottom:-5px;right:-5px;width:5px;transform:skewY(44deg);background:linear-gradient(90deg,#97a79c3b,#fff9,#acb8b14a);border:1px solid #adbcb447;pointer-events:none}.glass-base{position:absolute;left:5px;right:-5px;bottom:-5px;height:5px;transform:skewX(44deg);background:linear-gradient(#ffffffbd,#b1beb58c,#fff8);pointer-events:none}
.element-label{position:absolute;left:8px;top:6px;display:flex;flex-direction:column;align-items:flex-start;line-height:1;z-index:5;text-shadow:0 1px 2px #fff}.atomic-number{font-size:11px;font-weight:400;margin-bottom:4px}.symbol{font-size:17px;font-weight:550;letter-spacing:-.4px}.specimen{position:absolute;width:48px;height:45px;right:5px;bottom:6px;object-fit:contain;mix-blend-mode:multiply;filter:drop-shadow(2px 5px 2px #283e3720);pointer-events:none}.exhibit.symbolic .specimen{width:37px;height:45px;right:9px;bottom:5px;mix-blend-mode:normal;opacity:.85}.exhibit .specimen[src=""]{display:none}.exhibit.is-active{border-color:#bc9c67;box-shadow:0 0 0 2px #bda3727a,inset 0 0 0 3px #fff,4px 15px 12px #3c4e3d24}.exhibit:focus-visible{outline:2px solid #947044;outline-offset:3px;z-index:10}
@media(hover:hover){.exhibit:hover{z-index:12;transform:translate(-2px,-5px);border-color:#b69560;box-shadow:0 0 0 1px #c2a7787d,inset 1px 1px 2px #fff,5px 20px 13px #233f3330}.exhibit:hover::before{border-color:#fff}.exhibit:hover .specimen{filter:drop-shadow(2px 6px 2px #283e3730)}}
.series-placeholder{position:relative;display:flex;justify-content:center;align-items:center;flex-direction:column;font-size:13px;color:#718076;letter-spacing:1px}.series-placeholder span{font-size:18px;line-height:1.8}.group-label,.period-label{position:absolute;font-size:13px;color:#647167;text-align:center;line-height:20px}.group-label{width:72px}.period-label{left:27px;width:18px}.series-label{position:absolute;left:89px;width:193px;display:flex;align-items:flex-start;flex-direction:column;gap:9px;color:#66766a}.series-label span{font-size:13px;letter-spacing:2px}.series-label strong{font-size:16px;font-weight:400;letter-spacing:2px}.lanthanide-label{top:788px}.actinide-label{top:870px}.wall-colophon{position:absolute;left:1513px;top:789px;font-size:10px;letter-spacing:2px;line-height:2;color:#7f8b81;writing-mode:vertical-rl;margin:0}.wall-colophon span{height:30px;border-left:1px solid #92a094;margin-top:15px}
.gallery-controls{position:fixed;bottom:0;left:0;right:0;height:80px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:0 max(26px,env(safe-area-inset-right)) env(safe-area-inset-bottom) max(26px,env(safe-area-inset-left));background:linear-gradient(180deg,#edf0ee,#f5f6f4);border-top:1px solid #ffffffb3;z-index:20}.view-controls{display:flex;align-items:center;gap:3px}.icon-button,.fit-button{border:0;background:transparent;height:42px;min-width:42px;font-size:23px;line-height:1}.fit-button{font-size:12px;min-width:46px;letter-spacing:1px}.control-divider{height:16px;border-left:1px solid #c5cdc7;margin:0 18px}#interaction-hint{font-size:12px;letter-spacing:.6px;color:#778279}.language-control{display:flex;gap:3px;padding:4px;background:#fff5;border:1px solid #cbd3cd;border-radius:25px;box-shadow:inset 0 1px 2px #ffffff,0 2px 4px #394e3910}.language-control button{font-size:13px;border:0;border-radius:20px;min-width:42px;height:34px;background:transparent;color:#737d76}.language-control button[aria-pressed=true]{background:linear-gradient(#fff,#e6ebe6);box-shadow:0 1px 3px #334b3b25,inset 0 0 0 1px #fff;color:#273c2c}
.detail-overlay{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;padding:32px;background:#e7ece7c9;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);z-index:50;overflow:auto}.detail-panel{position:relative;width:1040px;max-width:100%;max-height:calc(100svh - 64px);display:grid;grid-template-columns:1fr 1fr;border-radius:7px;border:1px solid #fff;background:linear-gradient(125deg,#ffffffb8,#f8faf8e8);box-shadow:inset 0 0 0 5px #ffffff6b,inset 0 0 0 6px #cad4ce48,8px 14px 24px #34463717,0 44px 100px #253e3923;outline:none;overflow:auto;overscroll-behavior:contain}.close-detail{position:absolute;right:17px;top:16px;z-index:5;width:42px;height:42px;border:1px solid #cdd7cf8c;border-radius:50%;background:#f9fcf9ad;color:#5d6d61;font-size:17px}.detail-visual{position:relative;display:flex;align-items:center;justify-content:center;flex-direction:column;min-height:580px;padding:64px 32px 100px;background:radial-gradient(ellipse at 30% 20%,#fff 0,#e8ede650 65%,#ced8cd33);border-right:1px solid #d4ddd380;overflow:hidden}.specimen-label{position:absolute;top:34px;left:34px;display:flex;flex-direction:column;gap:5px;z-index:2}.specimen-label span{font-size:18px;letter-spacing:1px;color:#536552}.specimen-label strong{font-size:46px;font-weight:350;line-height:1.1;letter-spacing:-1.5px}.detail-image-button{display:flex;align-items:center;justify-content:center;width:100%;aspect-ratio:1;padding:14px;border:0;background:transparent}.detail-image-button img{width:100%;height:100%;max-height:400px;object-fit:contain;mix-blend-mode:multiply;filter:drop-shadow(7px 17px 10px #24402516)}.detail-image-button.symbolic img{width:66%;mix-blend-mode:normal}.specimen-caption{position:absolute;bottom:28px;left:34px;right:34px;color:#788477}.specimen-caption>span{display:block;font-size:10px;letter-spacing:2.2px;text-transform:uppercase;margin-bottom:10px}.specimen-caption p{font-size:12px;line-height:1.7;margin:0}.visual-corner{position:absolute;width:23px;height:23px;border-color:#9dae9a88;border-style:solid;pointer-events:none}.corner-tl{border-width:1px 0 0 1px;left:16px;top:16px}.corner-br{border-width:0 1px 1px 0;right:16px;bottom:16px}.detail-copy{padding:50px 40px 30px}.detail-copy .eyebrow{font-size:11px;letter-spacing:2px;margin-bottom:12px;padding-right:24px}.detail-copy h2{font-size:40px;font-weight:350;letter-spacing:2px;line-height:1.2;margin:0 0 8px}.detail-english{font-size:14px;color:#79867a;margin:0 0 25px;letter-spacing:1.5px}.detail-facts{display:flex;gap:24px;margin:0 0 26px;padding:18px 0;border-top:1px solid #ccd7ca;border-bottom:1px solid #ccd7ca}.detail-facts>div{flex:1}.detail-facts dt{font-size:11px;color:#899383;margin-bottom:7px}.detail-facts dd{font-size:14px;margin:0}.detail-summary{font-size:15px;line-height:1.85;font-weight:400;margin:0 0 25px;color:#485946}.compounds-section h3{font-size:13px;font-weight:600;letter-spacing:1.4px;margin:0 0 15px}.compound{display:grid;grid-template-columns:74px 1fr;gap:10px;padding:11px 0;border-top:1px solid #d5dfd255}.compound-formula{font-size:18px;font-weight:400;letter-spacing:.2px}.compound-formula sub{font-size:11px}.compound-name{font-size:13px;font-weight:550;margin:0 0 4px}.compound-description,.compound-note{font-size:13px;line-height:1.75;color:#6c7b65;margin:0}.compound-note{border-top:1px solid #d5dfd255;padding-top:12px}.sources{margin-top:25px;border-top:1px solid #cfdacb;padding-top:16px;color:#7e8a77;font-size:11px;line-height:1.85}.sources summary{cursor:pointer;letter-spacing:.7px}.sources a{color:#657a5d;text-decoration-thickness:1px;text-underline-offset:3px;word-break:break-word}.sources p{margin:10px 0}.close-hint{font-size:10px;letter-spacing:.9px;color:#9ba693;margin:25px 0 0}
@media(max-width:700px){.gallery-controls{height:88px;padding-left:12px;padding-right:12px;padding-bottom:max(8px,env(safe-area-inset-bottom));align-items:center}.viewport{height:calc(100svh - 88px)}#interaction-hint,.control-divider{display:none}.icon-button{min-width:38px}.language-control button{min-width:36px}.detail-overlay{padding:14px;align-items:flex-start}.detail-panel{margin:auto;max-height:calc(100svh - 28px);grid-template-columns:1fr;overscroll-behavior:contain}.detail-visual{min-height:320px;height:320px;padding:42px 64px 68px;border-right:0;border-bottom:1px solid #d4ddd380}.detail-image-button{width:100%;height:220px;padding:0;aspect-ratio:auto}.detail-image-button img{max-height:210px}.detail-image-button.symbolic img{height:200px;width:auto}.specimen-label{top:25px;left:26px}.specimen-label strong{font-size:39px}.specimen-caption{bottom:18px;left:26px;right:26px}.specimen-caption>span{font-size:9px;margin-bottom:5px}.specimen-caption p{font-size:11px}.detail-copy{padding:27px 26px}.detail-copy h2{font-size:34px}.detail-summary{font-size:15px}.close-detail{position:sticky;grid-column:1;justify-self:end;right:auto;top:12px;margin:12px 12px -54px 0;align-self:start}.detail-facts{gap:18px}.detail-english{margin-bottom:19px}.sources{font-size:12px}.close-hint{font-size:11px}}
.element-label{width:24px;white-space:nowrap}.symbol{font-size:16px}.specimen{left:34px;right:auto;bottom:7px;width:32px;height:48px}.exhibit.symbolic .specimen{left:34px;right:auto;width:30px;height:45px;bottom:7px}.specimen-condition{position:absolute;left:7px;bottom:9px;font-size:8px;letter-spacing:.3px;color:#86948a}.wall-colophon{left:1550px}.license-notice{white-space:pre-line;font-size:10px}
.specimen,.detail-image-button img{mix-blend-mode:normal}.compound{grid-template-columns:minmax(80px,max-content) minmax(0,1fr);gap:16px}.compound-formula{white-space:nowrap}.detail-summary{font-size:16px}.compound-description,.compound-note{font-size:14px}.detail-copy .eyebrow,.sources{color:#65765f}
@media(min-width:701px){.detail-panel{overflow:hidden}.detail-copy{max-height:min(720px,calc(100svh - 64px));overflow:auto;overscroll-behavior:contain}.detail-visual{min-height:min(580px,calc(100svh - 64px))}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important;scroll-behavior:auto!important}}
/* Native controls remain comfortably tappable on phones and tablets. */
.mobile-intro,.element-picker{display:none}
@media (pointer:coarse),(max-width:1100px){
  .element-picker{display:block;min-height:44px;max-width:225px;min-width:145px;padding:0 32px 0 14px;font:inherit;font-size:13px;color:#415143;background:#ffffffa8;border:1px solid #cbd3cd;border-radius:8px}
  #interaction-hint,.control-divider{display:none}.language-control button{min-width:44px;min-height:44px}.icon-button,.fit-button{min-width:44px;min-height:44px}
}
@media(max-width:700px) and (orientation:portrait){
  .mobile-intro{display:block;position:absolute;top:max(38px,env(safe-area-inset-top));left:28px;right:28px;pointer-events:none;transition:opacity .2s;color:#526057}
  .mobile-intro>span{font-size:10px;letter-spacing:2.6px}.mobile-intro>p{font-size:29px;font-weight:300;line-height:1.3;margin:16px 0 12px;letter-spacing:1px}.mobile-intro>small{font-size:12px;color:#7a867c}
  .viewport.is-zoomed .mobile-intro{opacity:0}.wall-heading,.wall-note{visibility:hidden}
  .viewport{height:calc(100svh - 142px - env(safe-area-inset-bottom))}.gallery-controls{height:calc(142px + env(safe-area-inset-bottom));padding:10px 16px calc(10px + env(safe-area-inset-bottom));display:grid;grid-template-columns:1fr auto;grid-template-rows:44px 54px;gap:10px 12px}
  .element-picker{grid-row:1;grid-column:1 / -1;max-width:none;width:100%;font-size:14px}.view-controls{grid-row:2;grid-column:1}.language-control{grid-row:2;grid-column:2}
}
@media(max-width:700px) and (orientation:landscape){
  .gallery-controls{height:64px;padding:5px max(12px,env(safe-area-inset-right)) 5px max(12px,env(safe-area-inset-left));gap:8px}
  .viewport{height:calc(100svh - 64px)}.element-picker{max-width:185px;min-width:120px}.view-controls{gap:0}
}
@media(max-width:380px) and (orientation:portrait){
  .gallery-controls{padding-left:10px;padding-right:10px;column-gap:4px}.language-control{gap:0;padding:2px}
}
button{-webkit-appearance:none;appearance:none}
.close-detail{width:44px;height:44px}
#gallery[aria-hidden="true"]{filter:blur(8px)}
/* Image, label and caption occupy separate rows in the detail specimen. */
.detail-visual{display:grid;grid-template-columns:minmax(0,1fr);grid-template-rows:auto minmax(160px,1fr) auto;align-items:center;justify-items:center;gap:10px;padding:28px 32px}
.specimen-label{position:static;justify-self:start;width:100%;display:flex;flex-direction:row;align-items:baseline;gap:12px}
.detail-image-button{width:100%;height:100%;min-height:160px;max-height:400px;aspect-ratio:auto;padding:8px 0}
.detail-image-button img{height:100%;max-height:350px}
.specimen-caption{position:static;justify-self:start;width:100%}
.specimen-caption p{overflow-wrap:anywhere}
@media(max-width:700px){
  .detail-visual{height:auto;min-height:350px;grid-template-rows:auto 195px auto;padding:24px 26px 22px;gap:12px}
  .detail-image-button{height:195px;min-height:0;padding:0}.detail-image-button img{max-height:195px}
  .detail-image-button.symbolic img{height:190px;width:auto;max-width:100%}
  .specimen-label strong{font-size:38px}.specimen-label span{font-size:16px}
  .compound{grid-template-columns:1fr;gap:8px;padding:14px 0}
}
@media(min-width:701px){
  .detail-panel{height:min(700px,calc(100svh - 64px));grid-template-rows:minmax(0,1fr)}
  .detail-copy{min-height:0;max-height:100%}
  .detail-visual{height:100%;min-height:0;max-height:100%;grid-template-rows:auto minmax(0,1fr) auto}
  .detail-image-button{min-height:0;max-height:100%;height:100%}
  .detail-image-button img{max-height:100%;height:100%}
}
.knowledge-section{margin:0 0 26px}
.knowledge-section h3{font-size:14px;font-weight:600;letter-spacing:1px;margin:0 0 12px;color:#40513e}
.uses-list{margin:0;padding-left:1.15em;font-size:16px;line-height:1.8;color:#53614d}
.uses-list li+li{margin-top:7px}
.uses-list li::marker{color:#94a28e;font-size:.72em}
.isotope{padding:12px 0;border-top:1px solid #d5dfd266}
.isotope-heading{display:flex;align-items:baseline;flex-wrap:wrap;gap:5px 10px;margin-bottom:6px}
.isotope-notation{font-size:20px;white-space:nowrap;line-height:1.4;color:#354732}
.isotope-notation sup{font-size:11px;margin-right:1px}
.isotope-name{font-size:14px;font-weight:550;color:#4b5e45}
.isotope-stability{font-size:12px;color:#73806d;white-space:nowrap}
.isotope-description{font-size:16px;line-height:1.8;color:#63725c;margin:0;overflow-wrap:anywhere}
/* Long formulas and enlarged text can use a full row in a narrow detail column. */
.detail-copy{min-width:0;overflow-wrap:anywhere}
.compound{display:flex;flex-wrap:wrap;gap:8px 16px}
.compound-formula{flex:0 0 auto;min-width:80px;max-width:100%;white-space:normal;overflow-wrap:anywhere}
.compound>div{flex:1 1 200px;min-width:0}
@media(max-width:700px){.compound-formula,.compound>div{flex-basis:100%}}