/* 430 Years: neon chart on charcoal. Boxes on the chart are the buttons; one reading panel below. */
.bgst{--bg:#121413;--deck:#1b1e1d;--rope:#2d3230;--ink:#eef2ef;--mist:#aab3ae;--haze:#7a847f;
  --neon:#4cff6a;--gold:#f5d33b;--violet:#b066e0;--red:#ff4a4a;--sky:#3aa0ff;--amber:#e7883a;
  --display:"Fraunces",Georgia,serif;--body:"Newsreader",Georgia,serif;--ui:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  color-scheme:dark;background:var(--bg);color:var(--ink);font-family:var(--body);font-size:18px;line-height:1.6;border-radius:16px}
.bgst,.bgst *{box-sizing:border-box}
.bgst-page{max-width:1400px;margin:0 auto;padding-block:20px 48px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.bgst button{font:inherit;line-height:normal;text-transform:none;letter-spacing:normal;box-shadow:none;min-height:0;min-width:0;text-shadow:none}
.bgst p{margin-top:0}
.bgst-hint{font-family:var(--ui);font-size:14px;color:var(--mist);margin:0 0 12px;display:flex;align-items:center;gap:8px}
.bgst-hint i{width:10px;height:10px;border-radius:50%;background:var(--neon);box-shadow:0 0 0 4px rgba(76,255,106,.25)}

.bgst-stage{position:relative;border-radius:14px;overflow:hidden;background:#0d0f0e;box-shadow:0 30px 70px -30px rgba(0,0,0,.85)}
.bgst .bgst-stage img{display:block;width:100%;height:auto;max-width:100%;margin:0;padding:0;border:0;border-radius:0;box-shadow:none}
.bgst-box{position:absolute;padding:0!important;margin:0!important;border:0!important;background:transparent!important;cursor:pointer;border-radius:8px!important;-webkit-tap-highlight-color:transparent}
.bgst-box::before{content:"";position:absolute;inset:-3px;border-radius:9px;border:2px solid transparent;transition:border-color .15s,background .15s,box-shadow .15s}
.bgst-box:hover::before,.bgst-box:focus-visible::before{border-color:#fff;background:rgba(255,255,255,.07)}
.bgst-box.on::before{border-color:#fff;background:rgba(255,255,255,.10);box-shadow:0 0 0 4px rgba(255,255,255,.18),0 0 26px rgba(255,255,255,.35)}
.bgst-box:focus{outline:none}
.bgst-pin{position:absolute;width:20px;height:20px;margin:-10px 0 0 -10px;border-radius:50%!important;background:#fff!important;border:3px solid var(--neon)!important;padding:0!important;cursor:pointer;box-shadow:0 0 12px rgba(76,255,106,.8)}
.bgst-pin::after{content:"";position:absolute;inset:-9px;border-radius:50%;border:2px solid var(--neon);opacity:0;animation:bgstping 2.4s ease-out infinite}
.bgst-pin:nth-of-type(2n)::after{animation-delay:.8s}
.bgst-pin.on{background:var(--neon)!important;border-color:#fff!important;transform:scale(1.2)}
.bgst-pin.on::after{animation:none}
@keyframes bgstping{0%{transform:scale(.6);opacity:.9}80%,100%{transform:scale(1.7);opacity:0}}
.bgst-sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

.bgst-track{margin:20px 2px 0;font-family:var(--ui)}
.bgst-bar{position:relative;height:10px;border-radius:5px;background:var(--rope)}
.bgst-seg{position:absolute;top:0;bottom:0;border-radius:5px;transition:left .4s ease,width .4s ease,background .3s}
.bgst-tick{position:absolute;top:50%;width:14px;height:14px;margin:-7px 0 0 -7px;border-radius:50%!important;background:var(--deck)!important;border:2px solid var(--haze)!important;padding:0!important;cursor:pointer}
.bgst-tick.past{background:#fff!important;border-color:#fff!important}
.bgst-tick.on{background:var(--neon)!important;border-color:var(--neon)!important;width:18px;height:18px;margin:-9px 0 0 -9px}
.bgst-ends{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:var(--haze);margin-top:8px;font-variant-numeric:tabular-nums}

.bgst-panel{display:grid;grid-template-columns:minmax(0,1fr);gap:24px;margin-top:22px;background:var(--deck);border:1px solid var(--rope);border-radius:14px;padding:24px}
@media (min-width:900px){.bgst-panel{grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:40px;padding:30px 34px}}
.bgst-step{font-family:var(--ui);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--neon);margin:0}
.bgst .bgst-panel h2{font-family:var(--display);font-weight:400;font-size:clamp(28px,3.6vw,42px);line-height:1.1;margin:6px 0 16px;color:var(--ink);letter-spacing:normal;text-transform:none;text-wrap:balance}
.bgst-facts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.bgst-fact{background:var(--bg);border:1px solid var(--rope);border-radius:10px;padding:10px 12px;min-width:0}
.bgst-fact b{display:block;font-family:var(--ui);font-weight:500;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--haze)}
.bgst-fact span{display:block;font-family:var(--ui);font-size:16px;color:var(--ink);margin-top:2px;font-variant-numeric:tabular-nums}
.bgst-fact small{display:block;font-family:var(--ui);font-size:12px;color:var(--mist)}
.bgst .bgst-note{color:var(--mist)!important;margin:16px 0 0;font-size:17px}
.bgst .bgst-flag{font-family:var(--ui);font-size:13px;color:var(--gold)!important;margin:10px 0 0;padding:8px 12px;border:1px solid rgba(245,211,59,.35);border-radius:8px;background:rgba(245,211,59,.06)}
.bgst-nav{display:flex;gap:10px;margin-top:22px}
.bgst .bgst-nav button{font-family:var(--ui)!important;font-size:15px!important;color:var(--ink)!important;background:transparent!important;border:1px solid var(--rope)!important;border-radius:8px!important;padding:10px 16px!important;cursor:pointer}
.bgst .bgst-nav button:hover:not(:disabled){border-color:var(--neon)!important}
.bgst .bgst-nav button:disabled{opacity:.35;cursor:default}
.bgst button:focus-visible{outline:2px solid var(--neon);outline-offset:3px}
.bgst .bgst-verse{margin:0!important;padding:0 0 0 20px!important;border:0!important;border-left:3px solid var(--violet)!important;background:none!important;quotes:none}
.bgst .bgst-verse::before,.bgst .bgst-verse::after{content:none}
.bgst .bgst-verse p{color:var(--ink)!important;font-family:var(--body)!important;font-style:italic!important;font-size:19px!important;margin:0 0 12px!important}
.bgst .bgst-verse p sup{font-style:normal;font-family:var(--ui);font-size:11px;color:var(--violet);margin-right:4px}
.bgst .bgst-verse cite{display:block;margin:0 0 14px;color:var(--amber)!important;font-family:var(--ui)!important;font-style:normal!important;font-size:14px!important;font-weight:500!important}
.bgst-anim{animation:bgstrise .3s ease}
@keyframes bgstrise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

.bgst-sum{margin-top:28px;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:14px}
.bgst-card{background:var(--deck);border:1px solid var(--rope);border-radius:12px;padding:18px 20px;min-width:0}
.bgst .bgst-card h3{font-family:var(--display);font-weight:400;font-size:22px;margin:0 0 8px;color:var(--ink)}
.bgst-math{font-family:var(--ui);font-size:14px;color:var(--mist);font-variant-numeric:tabular-nums;width:100%;border-collapse:collapse;margin:0;background:none;border:0}
.bgst-math td{padding:5px 0;border:0;border-bottom:1px solid var(--rope);background:none;color:var(--mist)}
.bgst-math td:last-child{text-align:right;color:var(--ink);white-space:nowrap;padding-left:12px}
.bgst-math tr:last-child td{border-bottom:0;color:var(--neon);font-weight:500}
.bgst .bgst-card p{font-size:16px;color:var(--mist);margin:8px 0 0}
.bgst-foot{font-family:var(--ui);font-size:13px;color:var(--haze);margin-top:18px}
@media (max-width:640px){.bgst{font-size:17px}.bgst-pin{width:14px;height:14px;margin:-7px 0 0 -7px;border-width:2px!important}.bgst-panel{padding:20px}.bgst .bgst-verse p{font-size:18px!important}}
@media (prefers-reduced-motion:reduce){.bgst-pin::after{animation:none}.bgst-anim{animation:none}.bgst-seg{transition:none}}

.bgst-chart + .bgst-chart{margin-top:56px;padding-top:40px;border-top:1px solid var(--rope)}
.bgst .bgst-chart-head h2{font-family:var(--display);font-weight:400;font-size:clamp(28px,3.4vw,40px);line-height:1.1;margin:0 0 6px;color:var(--ink);letter-spacing:normal;text-transform:none}
.bgst .bgst-chart-head p{color:var(--mist);margin:0 0 14px;max-width:70ch;font-size:17px}