:root{color-scheme:light;--ink:#13263a;--muted:#536476;--blue:#245f91;--line:#dce4ec;--paper:#fff;--wash:#f5f8fb;--band:#d7e7f5}
*{box-sizing:border-box}
body{margin:0;background:var(--wash);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.6}
a{color:var(--blue);text-underline-offset:.2em}
a:hover{text-decoration-thickness:2px}
button,input{font:inherit}
button{min-height:44px;padding:.58rem .9rem;border:1px solid var(--blue);border-radius:6px;background:var(--blue);color:#fff;font-weight:600;cursor:pointer}
button:hover{filter:brightness(.93)}
button:disabled{opacity:.5;cursor:not-allowed}
button.secondary{background:var(--paper);color:var(--blue)}
:focus-visible{outline:3px solid #3383bd;outline-offset:4px}
.wrap{max-width:1260px;margin:auto;padding:0 28px}
.skip-link{position:absolute;left:20px;top:-80px;z-index:2;padding:12px;background:white}
.skip-link:focus{top:12px}
.page-header{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;padding:26px 0;border-bottom:1px solid var(--line);font-size:.9rem}
.brand{font-weight:700;color:var(--ink);text-decoration:none;font-size:1rem}
main{padding:40px 0 20px}
.eyebrow{font-size:.73rem;text-transform:uppercase;letter-spacing:.15em;color:var(--blue);font-weight:700;margin:0 0 10px}
h1{font-size:clamp(2rem,4vw,3rem);line-height:1.15;letter-spacing:-.035em;margin:0 0 16px}
h2{font-size:1.1rem;line-height:1.3;margin:0}
.intro{max-width:760px;font-size:1.08rem;color:var(--muted);margin:0 0 12px}
.privacy-note{font-size:.84rem;color:var(--muted);margin:0 0 28px}
.explorer{display:grid;grid-template-columns:285px minmax(0,1fr);gap:22px;align-items:start}
.panel{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:22px}
.controls{font-size:.9rem}
fieldset{min-width:0;border:0;padding:0;margin:0 0 24px}
legend{padding:0;margin-bottom:14px;font-weight:700;font-size:1rem}
.parameter{margin-bottom:20px}
.parameter:last-child{margin-bottom:0}
.parameter label{display:block;font-weight:600;line-height:1.45;margin-bottom:8px}
output{float:right;font-variant-numeric:tabular-nums;font-size:.85rem;color:var(--blue);margin-left:6px}
input[type=range]{display:block;width:100%;height:28px;margin:0;accent-color:var(--blue);cursor:pointer}
.hint{font-size:.8rem;color:var(--muted);line-height:1.55;margin:7px 0 0}
.coordinate-fields{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}
.coordinate-fields label{font-weight:600}
input[type=number]{display:block;width:100%;min-width:0;min-height:44px;border:1px solid #9eafbf;border-radius:5px;background:#fff;color:var(--ink);padding:6px 8px;margin-top:4px}
#add-point{width:100%;margin-top:14px}
.button-row{display:flex;flex-wrap:wrap;gap:8px}
.button-row button{flex:1;white-space:nowrap;font-size:.8rem}
.action-status{font-size:.82rem;min-height:1.6em;margin:14px 0 0;color:var(--blue)}
.action-status.error{color:#a12c38}
.results{min-width:0}
.plot-panel{padding:22px 22px 18px}
.plot-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
#observation-count{font-size:.78rem;color:var(--muted);font-variant-numeric:tabular-nums}
#plot-container{width:100%;margin-top:12px;overflow:hidden}
#plot{display:block;width:100%;height:auto;touch-action:manipulation;cursor:crosshair;user-select:none}
.grid-line{stroke:#e6edf3;stroke-width:1}
.axis-line{stroke:#a0b0bf;stroke-width:1}
.axis-text{fill:var(--muted);font-family:system-ui,sans-serif;font-size:12px}
.axis-label{fill:var(--ink);font-family:system-ui,sans-serif;font-size:13px}
.interval{fill:var(--band)}
.posterior-mean{fill:none;stroke:var(--blue);stroke-width:2.5;stroke-linejoin:round}
.observation{fill:var(--ink);stroke:white;stroke-width:1.7;cursor:pointer}
.point-target{cursor:pointer;fill:transparent}
.legend{list-style:none;display:flex;flex-wrap:wrap;gap:9px 18px;padding:0;margin:4px 0 0;font-size:.75rem;color:var(--muted)}
.legend li{display:flex;align-items:center;gap:7px}
.key{display:inline-block;width:18px;height:10px;flex-shrink:0}
.mean-key{height:0;border-top:3px solid var(--blue)}
.band-key{background:var(--band);border:1px solid #a5c5df}
.point-key{width:8px;height:8px;border-radius:50%;background:var(--ink)}
.interval-note{margin-top:14px;max-width:750px;font-size:.76rem}
.model-summary{font-size:.84rem;color:var(--muted);padding:0 3px;line-height:1.7;min-height:2.8em}
.data-panel{padding:15px 20px;margin:12px 0}
summary{cursor:pointer;font-size:.9rem;font-weight:600;min-height:26px}
details[open] summary{margin-bottom:14px}
.table-scroll{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:.8rem;font-variant-numeric:tabular-nums}
caption{text-align:left;color:var(--muted);font-size:.75rem;padding:0 0 10px}
th,td{text-align:right;padding:9px 7px;border-bottom:1px solid var(--line);white-space:nowrap}
th:first-child,td:first-child{text-align:left}
th{font-weight:600}
td button{min-height:36px;padding:4px 10px;font-size:.75rem}
.explanation{max-width:850px;margin:30px 0 15px;font-size:.9rem;color:var(--muted)}
.explanation summary{color:var(--ink)}
.formula{color:var(--ink);font-family:Georgia,serif;font-size:1.1rem;overflow-wrap:anywhere}
.notice{padding:20px;border:1px solid var(--line);background:white}
footer{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;border-top:1px solid var(--line);padding:25px 0 35px;font-size:.78rem;color:var(--muted)}
@media(max-width:850px){.explorer{grid-template-columns:235px minmax(0,1fr);gap:15px}.panel{padding:18px}.wrap{padding:0 20px}.plot-panel{padding:18px 12px}.controls{font-size:.84rem}}
@media(max-width:680px){.wrap{padding:0 16px}main{padding-top:28px}.explorer{grid-template-columns:1fr}.controls{display:grid;grid-template-columns:1fr 1fr;gap:18px}.controls>fieldset{grid-row:span 3;margin:0}.controls form fieldset{margin:0}.button-row{align-self:start}.controls>.hint,.action-status{grid-column:2;margin:0}.coordinate-fields{margin-top:8px}.results{margin-top:4px}.privacy-note{margin-bottom:22px}.plot-panel{padding:18px 10px}.plot-heading,#plot-help,.legend,.interval-note{margin-left:8px;margin-right:8px}}
@media(max-width:430px){.controls{display:block}.controls>fieldset{margin-bottom:24px}.controls form fieldset{margin-bottom:18px}.controls>.hint,.action-status{margin-top:12px}.page-header{font-size:.8rem;padding:20px 0}.legend{gap:9px 12px}th,td{padding:9px 5px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}