*{box-sizing:border-box}
body{margin:0;background:#f4f7fb;color:#20334a;font:16px/1.55 system-ui,Arial,sans-serif}
.container{max-width:1060px;margin:30px auto;padding:0 18px}
header{margin-bottom:22px}h1{font-size:2.1rem;margin:0 0 8px}h2{font-size:1.35rem;margin:0 0 15px}h3{font-size:1.08rem;margin:20px 0 10px}
.eyebrow{font-size:.75rem;font-weight:800;letter-spacing:.12em;color:#2764a3}
.panel{background:white;border:1px solid #dae4ef;border-radius:13px;padding:22px;margin:18px 0;box-shadow:0 2px 8px #152b4410}
label{display:block;font-weight:650;margin:0 0 5px}input:not([type=checkbox]),select{width:100%;border:1px solid #b6c9db;border-radius:7px;padding:10px;font:inherit;background:white;color:inherit}
input:focus-visible,select:focus-visible,button:focus-visible,a:focus-visible{outline:3px solid #84b7e8;outline-offset:2px}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin:15px 0}
.hint,.field-note{color:#5d7083;font-size:.91rem}.field-note{display:block;margin-top:4px;font-size:.78rem}
.primary{background:#1767ab;color:white;border:0;font-weight:700;padding:11px 22px;border-radius:8px;cursor:pointer}
button:not(.primary){background:#f3f7fc;border:1px solid #b8cde0;border-radius:7px;padding:7px 12px;cursor:pointer;color:#1a4b75}
button:hover{filter:brightness(.95)}button[hidden]{display:none}a{color:#1465a7}
.form-actions{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin:14px 0}
.precision-label,.inline-label{display:flex;gap:8px;align-items:center;margin:0;font-size:.9rem;white-space:nowrap}
.precision-label select,.inline-label select{width:auto;min-width:100px;padding:7px;font-size:.9rem}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.stats>div{background:#f1f6fc;padding:12px;border-radius:8px;overflow-wrap:anywhere}
.stats span{display:block;color:#5a6d81;font-size:.85rem}.stats b{font-size:1.18rem;font-variant-numeric:tabular-nums}
#reference-note{border-left:3px solid #a8bfda;padding-left:12px;margin-bottom:0}
#reference-note.warning{border-left-color:#d18b28;color:#855617}
.controls{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:12px}
.check{font-size:.9rem;font-weight:400;margin:0 10px}.check input{vertical-align:middle}
canvas{width:100%;height:auto;background:#fff;border:1px solid #e3eaf1;border-radius:8px;display:block}
.table-scroll{overflow-x:auto;overflow-y:visible;border:1px solid #e4ebf3;border-radius:8px}
.table-scroll.compact-table{max-height:425px;overflow-y:auto}.compare-scroll{max-height:none}table{border-collapse:separate;border-spacing:0;width:100%;font-size:.9rem}
td,th{border-bottom:1px solid #e3eaf1;padding:8px 12px;text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
td:first-child,th:first-child{text-align:left}th{background:#f1f6fc;position:sticky;top:0;z-index:1}
tr:last-child td{border-bottom:0}.emphasis-row{background:#f1f7ff;font-weight:700}
.math-step{background:#f5f8fd;padding:12px 15px;border-left:3px solid #2b72b4;margin:12px 0;overflow-x:auto}
.math-step p{margin:7px 0}.math-step mjx-container{max-width:100%;overflow-x:auto;overflow-y:hidden}
.math-step .formula{margin:8px 0;max-width:100%;overflow-x:auto}.math-line{text-align:left}.math-line mjx-container[display="true"]{text-align:left!important;margin:8px 0!important}.formula mjx-container{max-width:100%;overflow-x:auto}
.samples-title{display:flex;align-items:center;gap:16px;justify-content:space-between}.samples-title h3{margin-bottom:6px}
#message:not(:empty){background:#fff0ed;color:#8d2e21;padding:12px;border-radius:8px}
footer{color:#66788a;margin:25px 0}
@media(max-width:600px){.grid,.stats{grid-template-columns:1fr}.panel{padding:14px}h1{font-size:1.6rem}.precision-label,.inline-label{white-space:normal}td,th{padding:7px 9px}.controls .inline-label{width:100%;justify-content:space-between}}

.stat-note{display:block;color:#5d7083;font-size:.76rem;margin-top:3px;font-weight:400}.stat-note:empty,.math-warning:empty{display:none}
.math-warning{padding:10px;background:#fff4e9;border-left:3px solid #d9a343;margin:10px 0;color:#855617}
.math-step .math-line+ .math-line{margin-top:5px}.math-step .formula mjx-container{font-size:100%;}
@media(max-width:600px){.math-step .formula mjx-container{font-size:90%} .math-step{padding:11px 9px}.stat-note{font-size:.8rem}}

/* v1.3 — evidenza sobria dei controlli di affidabilità */
.reliability{border-left:3px solid #8ca9c4;background:#f5f8fc;border-radius:4px;padding:12px 14px;margin-top:16px;line-height:1.5;font-size:.91rem}
.reliability.warning{border-left-color:#c88429;background:#fff8ed;color:#68451e}
.reliability p{margin:7px 0 0}

/* v1.4 RC: esito immediato e diagnostica comparativa del campionamento */
#value-card.quality-warning{background:#fff3db;border:1px solid #e4b96d}
#value-card.quality-warning b{color:#85450c}
.quality-label{display:block;font-size:.82rem;font-weight:700;color:#865017;margin-top:5px}
.quality-label:empty{display:none}
.sampling-panel{margin-top:18px;border-top:1px solid #e1e8f0;padding-top:8px}
.sampling-panel h3{margin:8px 0}
.sampling-panel .hint{margin:5px 0 10px}
.sampling-panel .selected-grid{background:#fff3db;font-weight:700}
#scale-control[hidden],.sampling-panel[hidden]{display:none}