/* Mendeleev element reference pages v2 — shared by EN + FR */
:root{--eref-line:rgba(23,42,58,.14);--eref-soft:#f5f8f7;--eref-ink:#172a3a;--eref-muted:#607080;--eref-accent:#13795b;--eref-accent-soft:#e8f5ef;--eref-card:#fff;--eref-shadow:0 14px 40px rgba(23,42,58,.08)}
[data-theme="dark"]{--eref-line:rgba(225,235,240,.16);--eref-soft:#17252d;--eref-ink:#edf4f7;--eref-muted:#aebcc5;--eref-accent:#58c99e;--eref-accent-soft:#17392f;--eref-card:#142029;--eref-shadow:0 16px 42px rgba(0,0,0,.22)}
.page-family-elements .page{color:var(--eref-ink)}
.eref-hero{display:grid;grid-template-columns:minmax(0,1fr) minmax(310px,390px);gap:34px;align-items:stretch;margin:34px 0 46px}.eref-hero-main{min-width:0}.eref-kicker,.eref-eyebrow{font-size:.76rem;font-weight:850;text-transform:uppercase;letter-spacing:.09em;color:var(--eref-accent)}
.eref-title-row{display:grid;grid-template-columns:112px minmax(0,1fr);gap:22px;align-items:center;margin-top:12px}.eref-title-row h1{font-size:clamp(2.8rem,6vw,5.1rem);line-height:.98;letter-spacing:-.055em;margin:0 0 12px}.eref-title-row p{font-size:1.08rem;line-height:1.64;color:var(--eref-muted);margin:0;max-width:860px}.eref-tile{width:112px;height:112px;border:1px solid var(--eref-line);border-radius:24px;background:var(--eref-card);position:relative;display:grid;place-items:center;box-shadow:var(--eref-shadow)}.eref-tile span{position:absolute;top:11px;left:13px;font-size:.78rem;color:var(--eref-muted);font-weight:800}.eref-tile b{font-size:3.6rem;line-height:1;letter-spacing:-.05em}
.eref-fastfacts{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px;margin-top:28px}.eref-fastfacts div{padding-top:10px;border-top:1px solid var(--eref-line);min-width:0}.eref-fastfacts span{display:block;font-size:.7rem;letter-spacing:.055em;text-transform:uppercase;color:var(--eref-muted)}.eref-fastfacts strong{display:block;margin-top:5px;font-size:.9rem;overflow-wrap:anywhere}
.periodic-context{border:1px solid var(--eref-line);border-radius:26px;background:var(--eref-card);padding:22px;box-shadow:var(--eref-shadow);display:flex;flex-direction:column;min-width:0}.periodic-context-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:18px}.periodic-context-head span{font-size:.76rem;text-transform:uppercase;letter-spacing:.07em;color:var(--eref-muted);font-weight:800}.periodic-context-head strong{font-size:1.04rem}.mini-grid{display:grid;grid-template-columns:repeat(var(--mini-cols),minmax(0,1fr));grid-template-rows:repeat(var(--mini-rows),86px);gap:7px;direction:ltr}.mini-series{display:grid;grid-template-columns:repeat(5,minmax(58px,1fr));gap:7px;direction:ltr}.mini-el{border:1px solid var(--eref-line);border-radius:14px;padding:8px;text-decoration:none;color:var(--eref-ink);background:var(--eref-soft);display:flex;flex-direction:column;min-width:0;transition:transform .12s ease,border-color .12s ease}.mini-el:hover{transform:translateY(-2px);border-color:var(--eref-accent)}.mini-el.is-current{background:var(--eref-accent);color:#fff;border-color:var(--eref-accent);box-shadow:0 8px 22px color-mix(in srgb,var(--eref-accent) 28%,transparent)}.mini-el span{font-size:.67rem;opacity:.75}.mini-el b{font-size:1.45rem;line-height:1.05;margin-top:3px}.mini-el small{font-size:.66rem;margin-top:auto;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mini-caption{font-size:.78rem;color:var(--eref-muted);margin:11px 0 0}.periodic-link{margin-top:auto;padding-top:18px;color:var(--eref-accent);font-weight:800;text-decoration:none;font-size:.9rem}
.eref-section{margin:54px 0}.eref-section h2{font-size:clamp(1.65rem,3.1vw,2.45rem);letter-spacing:-.03em;margin:7px 0 17px}.eref-section p{font-size:1.035rem;line-height:1.72;color:var(--eref-ink)}.eref-wide{max-width:960px}.eref-prose{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(260px,.85fr);gap:30px;align-items:start}.eref-prose p{margin:0}.eref-note{border-left:3px solid var(--eref-accent);padding:4px 0 4px 18px;display:grid;gap:6px}.eref-note strong{font-size:.98rem}.eref-note span{font-size:.92rem;line-height:1.55;color:var(--eref-muted)}
.use-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.use-card{border:1px solid var(--eref-line);border-radius:18px;padding:19px 20px;background:var(--eref-card)}.use-card h3{font-size:1.03rem;margin:0 0 7px}.use-card p{font-size:.92rem;line-height:1.57;color:var(--eref-muted);margin:0}
.data-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.data-cell{border:1px solid var(--eref-line);border-radius:15px;background:var(--eref-card);padding:14px 15px}.data-cell span{display:block;font-size:.73rem;color:var(--eref-muted)}.data-cell strong{display:block;margin-top:5px;font-size:.96rem;overflow-wrap:anywhere}.data-note{font-size:.82rem!important;color:var(--eref-muted)!important;margin-top:12px}
@media(max-width:980px){.eref-hero{grid-template-columns:1fr}.periodic-context{display:none}.eref-fastfacts{grid-template-columns:repeat(3,minmax(0,1fr))}.eref-prose{grid-template-columns:1fr}.data-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:620px){.eref-title-row{grid-template-columns:78px minmax(0,1fr);gap:14px}.eref-tile{width:78px;height:78px;border-radius:18px}.eref-tile b{font-size:2.55rem}.eref-title-row h1{font-size:2.55rem}.eref-title-row p{font-size:.98rem}.eref-fastfacts{grid-template-columns:repeat(2,minmax(0,1fr))}.use-grid,.data-grid{grid-template-columns:1fr}.eref-section{margin:42px 0}}