/* ─────────────────────────────────────────────────────────────────────────
   Reference pages: where civilization stands (/scale) and the periodic
   table (/elements). Classes only; no inline styles (CIV-085).
   ───────────────────────────────────────────────────────────────────────── */

/* ── /scale ───────────────────────────────────────────────────────────── */
.sc-section { margin: 34px 0; }
.sc-section h3 { margin-top: 22px; }
.sc-headline { display: flex; gap: 22px; align-items: center; flex-wrap: wrap; margin: 12px 0 18px; }
.sc-headline p { margin: 0 0 4px; }
.sc-big { font-family: var(--serif); font-size: 44px; font-weight: 900; color: var(--ink); line-height: 1; }
.sc-chart { display: block; width: 100%; height: auto; margin: 8px 0; }
.sc-grid { stroke: var(--hairline); stroke-width: 1; }
.sc-axis { fill: var(--muted); font-family: var(--mono); font-size: 11px; }
/* SVG text scales with the chart; on a phone the chart is half as wide, so its
   labels are drawn twice as large to stay readable. */
@media (max-width: 600px) { .sc-axis { font-size: 22px; } }
.sc-line { fill: none; stroke: var(--ember); stroke-width: 2.5; }
.sc-dot { fill: var(--ember); }
.sc-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; margin: 10px 0 18px; }
.sc-card { background: var(--paper); border: 1px solid var(--hairline); border-radius: var(--r-md); padding: 12px 14px; display: flex; flex-direction: column; gap: 6px; min-width: 0; overflow-wrap: anywhere; }
.sc-card-name { font-weight: 600; color: var(--ink); font-size: 14px; }
.sc-card-value { font-family: var(--serif); font-size: 24px; font-weight: 700; color: var(--ink); }
.sc-spark { display: block; width: 132px; height: 34px; }
.sc-spark path { fill: none; stroke: var(--ember); stroke-width: 1.5; }
.sc-bar { display: block; width: 100%; min-width: 80px; height: 14px; }
.sc-bar-stage { fill: var(--muted); }
.sc-bar-today { fill: var(--ember); }
.sc-today td { border-top: 2px solid var(--ember); }
.sc-data { margin-top: 8px; }
.sc-data summary { cursor: pointer; font-weight: 600; }
.home-scale { display: flex; gap: 10px 18px; align-items: baseline; flex-wrap: wrap; }
.home-scale b { font-family: var(--serif); font-size: 22px; color: var(--ink); }
.tier-energy { margin: 6px 0 0; font-size: 13px; color: var(--muted); }
.tier-energy a { color: var(--ember-2); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }

/* Tier colours as classes, for markup that must not carry inline styles. */
.tier-t0 { --tier: var(--t0); --tier-soft: var(--t0-soft); }
.tier-t1 { --tier: var(--t1); --tier-soft: var(--t1-soft); }
.tier-t2 { --tier: var(--t2); --tier-soft: var(--t2-soft); }
.tier-t3 { --tier: var(--t3); --tier-soft: var(--t3-soft); }
.tier-t4 { --tier: var(--t4); --tier-soft: var(--t4-soft); }
.tier-t5 { --tier: var(--t5); --tier-soft: var(--t5-soft); }
.tier-t6 { --tier: var(--t6); --tier-soft: var(--t6-soft); }
.tier-t7 { --tier: var(--t7); --tier-soft: var(--t7-soft); }

/* ── /elements ────────────────────────────────────────────────────────── */
.pt-scroll { overflow-x: auto; margin: 14px 0 26px; padding-bottom: 6px; }
.pt-grid { display: grid; grid-template-columns: repeat(18, minmax(46px, 1fr)); grid-template-rows: repeat(7, auto) 14px repeat(2, auto); gap: 3px; min-width: 870px; }
.pt-cell { position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 54px; padding: 3px 2px; border: 1px solid var(--hairline); border-radius: 6px; color: var(--ink); text-align: center; line-height: 1.1; }
.pt-cell:hover { border-color: var(--ink); }
.pt-cell:focus-visible { outline: 3px solid var(--ink); outline-offset: 1px; }
.pt-cell.is-sel { outline: 3px solid var(--ember); outline-offset: 1px; }
.pt-z { align-self: flex-start; font-family: var(--mono); font-size: 10px; }
.pt-sym { font-family: var(--serif); font-size: 17px; font-weight: 800; }
.pt-name { max-width: 100%; overflow: hidden; font-size: 9px; text-overflow: ellipsis; white-space: nowrap; }
.pt-used::after { content: "•"; position: absolute; top: 0; right: 4px; color: var(--ember-2); font-size: 16px; font-weight: 900; }
.pt-ph { border-style: dashed; }
.pt-ph .pt-sym { font-family: var(--mono); font-size: 11px; font-weight: 600; }
.pt-alkali { background: var(--t0-soft); }
.pt-alkaline { background: var(--t5-soft); }
.pt-transition { background: var(--t3-soft); }
.pt-post { background: var(--t7-soft); }
.pt-metalloid { background: var(--t2-soft); }
.pt-nonmetal { background: var(--t1-soft); }
.pt-halogen { background: var(--ember-soft); }
.pt-noble { background: var(--t6-soft); }
.pt-lanthanide { background: var(--t4-soft); }
.pt-actinide { background: var(--hairline); }
.pt-r1 { grid-row: 1; } .pt-r2 { grid-row: 2; } .pt-r3 { grid-row: 3; } .pt-r4 { grid-row: 4; } .pt-r5 { grid-row: 5; }
.pt-r6 { grid-row: 6; } .pt-r7 { grid-row: 7; } .pt-r9 { grid-row: 9; } .pt-r10 { grid-row: 10; }
.pt-c1 { grid-column: 1; } .pt-c2 { grid-column: 2; } .pt-c3 { grid-column: 3; } .pt-c4 { grid-column: 4; } .pt-c5 { grid-column: 5; } .pt-c6 { grid-column: 6; }
.pt-c7 { grid-column: 7; } .pt-c8 { grid-column: 8; } .pt-c9 { grid-column: 9; } .pt-c10 { grid-column: 10; } .pt-c11 { grid-column: 11; } .pt-c12 { grid-column: 12; }
.pt-c13 { grid-column: 13; } .pt-c14 { grid-column: 14; } .pt-c15 { grid-column: 15; } .pt-c16 { grid-column: 16; } .pt-c17 { grid-column: 17; } .pt-c18 { grid-column: 18; }
.pt-legend { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 14px; font-size: 12.5px; }
.pt-key { display: inline-flex; align-items: center; gap: 6px; }
.pt-key i { display: inline-block; width: 16px; height: 12px; border: 1px solid var(--hairline); border-radius: 3px; }
.pt-key i.pt-dot { border: 0; width: auto; height: auto; color: var(--ember-2); font-style: normal; font-weight: 900; }
.pt-detail { margin: 18px 0 8px; padding: 16px 18px; background: var(--paper); border: 1px solid var(--hairline); border-radius: var(--r-md); }
.pt-detail h2 { margin-bottom: 10px; }
.pt-detail-sym { display: inline-block; min-width: 1.6em; padding: 0 6px; margin-right: 6px; border: 2px solid var(--ink); border-radius: 6px; text-align: center; }
.pt-facts { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px 16px; margin: 0 0 14px; }
.pt-facts dt, .pt-uses dt { font-size: 11px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.pt-facts dd, .pt-uses dd { margin: 2px 0 0; }
.pt-uses { display: grid; gap: 10px; margin: 0 0 12px; }
.pt-ladder { margin: 10px 0 18px; }
.pt-tier { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 8px 0; }
.pt-chip { display: inline-block; padding: 3px 9px; border: 1px solid var(--hairline); border-radius: 999px; font-size: 13px; color: var(--ink); background: var(--paper); }
.pt-chip:hover { border-color: var(--ink); }
.pt-detail .plate { max-width: 420px; margin: 10px 0 4px; }
.pt-detail .plate img { max-height: 300px; object-fit: contain; background: var(--bg-2); }
.ref-row { margin: 30px 0 10px; }
.ref-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }