:root{font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:#172b45;background:#f3f6fc;line-height:1.5;font-size:16px}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #9cc5fa;outline-offset:2px}a{color:#145ba0}.page{max-width:1340px;margin:auto;padding:18px 24px 40px}.breadcrumb{display:flex;align-items:center;gap:9px;color:#65758a;font-size:.87rem;margin:0 0 15px}.intro{background:linear-gradient(120deg,#123e75,#17619a);color:white;border-radius:20px;padding:26px 30px;display:flex;justify-content:space-between;gap:18px;align-items:start}.intro h1{font-size:clamp(1.75rem,2.75vw,2.3rem);line-height:1.18;margin:4px 0 10px}.intro p:last-child{max-width:760px;margin:0;color:#e0eaf7}.eyebrow{color:#bad5ff;letter-spacing:.1em;font-weight:800;font-size:.72rem;margin:0}.version{white-space:nowrap;border:1px solid #adc8e5;padding:5px 11px;border-radius:99px;font-size:.8rem;color:#eaf2ff}.notice{background:#fff8e9;border:1px solid #e8c989;border-radius:10px;padding:11px 15px;margin:15px 0;color:#79531a;font-size:.85rem}.layout{display:grid;grid-template-columns:minmax(0,1.17fr) minmax(0,1fr);gap:18px;align-items:start}.work-col,.result-col{min-width:0;display:grid;gap:18px}.panel{background:white;border:1px solid #dae3ef;border-radius:16px;padding:21px 23px;box-shadow:0 5px 22px rgba(30,60,95,.035);min-width:0}.panel-heading{display:flex;justify-content:space-between;align-items:baseline;gap:10px;flex-wrap:wrap;margin:0 0 16px}.panel h2{font-size:1.22rem;margin:0;color:#17375a;line-height:1.3}.small-label{font-size:.76rem;color:#6c7e92}.point-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:11px}.point-input{min-width:0;display:grid;grid-template-columns:20px minmax(0,1fr);gap:7px;align-items:center;border:1px solid #d6e1ec;border-radius:10px;padding:10px;margin:0}.point-input legend{font-size:.88rem;font-weight:800;padding:0 4px;display:flex;align-items:center;gap:6px}.point-input label{color:#485e79;font-size:.85rem;font-weight:650}.point-input input{width:100%;min-width:0;border:1px solid #adbed2;border-radius:7px;padding:7px 8px;font-size:1rem;background:#fff;color:#172b45}.dot{display:inline-block;width:10px;height:10px;border-radius:50%}.a-dot{background:#1767c2}.b-dot{background:#db6123}.c-dot{background:#178369}.form-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:15px}.form-actions button,.tool-row button{border-radius:8px;padding:9px 12px;border:1px solid transparent;font-weight:700;font-size:.85rem}.primary{background:#205db0;color:white}.primary:hover{background:#17478e}.secondary{background:#eaf1fb;color:#204d7e}.secondary:hover{background:#d9e8f9}.examples{display:flex;gap:8px;align-items:center;flex-wrap:wrap;border-top:1px solid #e6edf5;margin-top:17px;padding-top:13px;font-size:.82rem}.examples>span{font-weight:700;color:#4d6179}.examples button{border:0;background:transparent;color:#145b9b;padding:4px 3px;text-decoration:underline;text-underline-offset:3px;font-size:inherit}.examples button:hover{color:#083d71}.message{min-height:0;color:#a23b28;font-weight:650;margin:8px 0 0;font-size:.84rem}.message:empty{display:none}.tool-row{display:flex;gap:9px;align-items:center;flex-wrap:wrap}.tool-row>label{font-weight:700;font-size:.85rem}.tool-row select{flex:1;min-width:200px;max-width:100%;padding:8px 7px;border:1px solid #b6c4d8;border-radius:8px;background:#fff;color:#172b45;font-size:.88rem}.tool-row button{color:#184f87;background:#edf4fc;border:1px solid #c0d1e5;min-width:35px;font-size:1rem;padding:6px 10px}.tool-row button.fit{font-size:.82rem}.checks{display:flex;flex-wrap:wrap;gap:10px 16px;margin:12px 0;color:#425a74;font-size:.82rem}.checks label{display:flex;align-items:center;gap:5px}.checks input{accent-color:#2465a8;width:15px;height:15px}.plot-frame{width:100%;border:1px solid #dbe5f0;border-radius:12px;overflow:hidden;background:#fff;touch-action:pan-y}.plot-frame svg{width:100%;height:auto;display:block;touch-action:none;user-select:none}.plot-frame svg .axis{stroke:#8492a5;stroke-width:1.6;vector-effect:non-scaling-stroke}.plot-frame svg .grid{stroke:#e5ebf3;stroke-width:1;vector-effect:non-scaling-stroke}.plot-frame svg .tick{fill:#6d7d91;font:12px system-ui,sans-serif}.plot-frame svg .pt{stroke:white;stroke-width:3;cursor:grab}.plot-frame svg .pt:active{cursor:grabbing}.plot-frame svg .point-hit{fill:transparent;cursor:grab}.plot-frame svg .point-label{font:700 18px system-ui,sans-serif;paint-order:stroke;stroke:#fff;stroke-width:4;stroke-linejoin:round}.plot-frame svg .help-line{stroke:#8b91ac;stroke-dasharray:7 5;stroke-width:1.7;fill:none;vector-effect:non-scaling-stroke}.plot-frame svg .geom-line{stroke:#2365b8;stroke-width:2.4;fill:none;vector-effect:non-scaling-stroke}.plot-frame svg .geom-circle{stroke:#625db2;stroke-width:2;fill:none;vector-effect:non-scaling-stroke}.plot-frame svg .geom-incircle{stroke:#16806c;stroke-width:2;fill:none;vector-effect:non-scaling-stroke}.plot-frame svg .geom-polygon{fill:rgba(40,105,170,.10);stroke:#366ca5;stroke-width:2.5;stroke-linejoin:round;vector-effect:non-scaling-stroke}.plot-frame svg .center-pt{stroke:white;stroke-width:2}.plot-frame svg .center-label{font:700 13px system-ui,sans-serif;paint-order:stroke;stroke:#fff;stroke-width:3}.help,.fineprint{font-size:.82rem;color:#66788e;line-height:1.6}.help{margin:10px 0}.legend{display:flex;flex-wrap:wrap;gap:8px 12px;font-size:.76rem;color:#546a85}.legend span{display:inline-flex;align-items:center;gap:5px}.legend i{width:9px;height:9px;border-radius:50%;display:inline-block}.metrics{width:100%;border-collapse:collapse;font-size:.89rem}.metrics th,.metrics td{border-bottom:1px solid #e9eef5;padding:7px 5px;text-align:left;vertical-align:top}.metrics th{font-weight:600;color:#54657a;width:58%}.metrics td{color:#173e70;font-variant-numeric:tabular-nums;font-weight:700;word-break:break-word}.result-group{margin:13px 0 4px;color:#173d66;font-size:1rem}.result-group:first-child{margin-top:0}.pill{display:inline-block;font-size:.8rem;padding:5px 9px;background:#eaf6ef;border:1px solid #c6e6d3;border-radius:8px;color:#20563c}.warning{border:1px solid #edc6be;background:#fff4f0;padding:12px;border-radius:9px;color:#954332;font-size:.88rem;margin:8px 0}.step{border-bottom:1px solid #e8eef5;padding:11px 0}.step:first-child{padding-top:0}.step:last-child{border-bottom:0}.step h3{font-size:.94rem;color:#1a426d;margin:0 0 5px}.step p{font-size:.85rem;color:#526982;margin:4px 0}.mathblock{overflow-x:auto;margin:8px 0;padding:9px 6px;border-radius:8px;background:#f6f9ff;font-size:.86rem}.mathblock mjx-container{margin:0!important;max-width:100%;overflow-x:auto;overflow-y:hidden;text-align:left!important}.theory{margin-top:18px}.theory-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.theory h3{margin:8px 0 5px;font-size:1rem;color:#254a75}.theory p{margin:0 0 10px;color:#5b6e82;font-size:.89rem}.theory .fineprint{margin-top:12px}footer{display:flex;gap:16px;justify-content:space-between;flex-wrap:wrap;padding:25px 4px;color:#6d8199;font-size:.8rem}footer a{text-decoration:none;font-weight:650}@media(max-width:1080px){.layout{grid-template-columns:1fr}.result-col{grid-template-columns:1fr 1fr;align-items:start}}@media(max-width:710px){.page{padding:14px 12px 25px}.intro{padding:22px 18px;border-radius:14px}.version{display:none}.panel{padding:16px}.point-grid{grid-template-columns:1fr}.point-input{grid-template-columns:20px 1fr 20px 1fr;gap:7px 8px}.result-col{grid-template-columns:1fr}.theory-grid{grid-template-columns:1fr;gap:10px}.tool-row select{min-width:160px}.plot-frame svg{min-height:275px}}

/* Geometria v1.2: costruzioni dei centri notevoli */
.construction-info{border-left:5px solid #8954b6;background:#f5f8fe;border-radius:9px;padding:11px 13px;margin:13px 0;font-size:.85rem;color:#344e6a;display:grid;gap:5px}
.construction-info[hidden]{display:none}
.construction-info b{font-size:.95rem;color:#173d66}
.construction-info em{color:#a34b32;font-style:normal;font-weight:650}
.construction-line{fill:none;stroke-width:2.8;stroke-dasharray:8 4;vector-effect:non-scaling-stroke}
.construction-axis{stroke:#b47a19;fill:none;stroke-width:2.15;stroke-dasharray:11 5;vector-effect:non-scaling-stroke}
.construction-extension{stroke:#a3aabd;stroke-width:1.8;stroke-dasharray:4 5;vector-effect:non-scaling-stroke}
.construction-pt{stroke:white;stroke-width:2;vector-effect:non-scaling-stroke}
.construction-label{font:700 16px system-ui,sans-serif;paint-order:stroke;stroke:#fff;stroke-width:4px;stroke-linejoin:round}
.angle-mark{fill:none;stroke-width:1.8;vector-effect:non-scaling-stroke}
.construction-tip{background:#f2f7ff;border:1px solid #d8e6f7;color:#35536d;border-radius:9px;padding:10px 12px;font-size:.87rem;line-height:1.6}

/* Distinzione didattica: tratto costruito, prolungamento verso H/O, lato prolungato. */
.construction-center-extension{stroke:#8e9baa;stroke-width:2.4;stroke-dasharray:7 7;fill:none;vector-effect:non-scaling-stroke}
.construction-side-extension{stroke:#c5cbd3;stroke-width:1.7;stroke-dasharray:3 6;fill:none;vector-effect:non-scaling-stroke}
.outside-hint{display:block;color:#40576c;font-size:.87rem;font-weight:650;margin-top:3px}

/* v1.3: circonferenze e costruzioni illustrate dei raggi e delle tangenze. */
.circle-radius-in{stroke:#16806c;stroke-width:1.9;stroke-dasharray:5 4;opacity:.9;fill:none;vector-effect:non-scaling-stroke}
.circle-radius-out{stroke:#625db2;stroke-width:2.1;stroke-dasharray:6 4;opacity:.8;fill:none;vector-effect:non-scaling-stroke}

/* v1.3.1: nella circoscritta gli assi gialli sono la costruzione principale;
   i raggi grigio chiarissimo restano unicamente di supporto alla spiegazione. */
.plot-frame svg .construction-axis-key{stroke:#d19a00;stroke-width:3.15;stroke-dasharray:10 4;stroke-linecap:round;fill:none;vector-effect:non-scaling-stroke}
.plot-frame svg .circle-radius-out{stroke:#c9d2dd;stroke-width:1.45;stroke-dasharray:5 6;opacity:.50;fill:none;vector-effect:non-scaling-stroke}


/* v1.4 — studio di due rette: editor di equazioni e visualizzazione. */
.line-editor{border:1px solid #d8e4f2;border-radius:12px;background:#f8fbff;padding:14px 15px;margin:15px 0;display:grid;gap:10px}
.line-editor[hidden]{display:none}
.line-editor h3{margin:0;color:#173e67;font-size:1rem}
.line-editor p{margin:0;color:#4e6781;font-size:.82rem}
.line-editor code{background:#eaf1fc;border-radius:3px;padding:1px 4px}
.line-input-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}
.line-input-grid label{font-size:.79rem;font-weight:700;color:#435f7a;min-width:0}
.line-input-grid input{display:block;width:100%;min-width:0;margin-top:5px;padding:9px 10px;border:1px solid #b6c9de;border-radius:8px;background:white;color:#163654;font-size:1rem}
.line-tag{display:inline-block;font-weight:800;margin-right:5px}.r-tag{color:#2166ae}.s-tag{color:#d36a30}
.line-point-editor{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:.82rem;color:#435c76}
.line-point-editor label{display:inline-flex;align-items:center;gap:5px;font-weight:700}
.line-point-editor input{width:82px;padding:6px 7px;border:1px solid #b6c9de;border-radius:7px;background:#fff}
.line-hint{color:#667b91;font-size:.78rem}
.line-examples{border-top:1px solid #e1eaf5;padding-top:10px;display:flex;flex-wrap:wrap;gap:5px 10px;align-items:center;font-size:.80rem}
.line-examples strong{color:#3d526a}
.line-examples button{background:none;border:0;color:#205b99;padding:2px 0;text-decoration:underline;text-underline-offset:3px;font-size:inherit}
.line-editor .message:not(:empty){background:#fff2ed;border:1px solid #e6b3a5;border-radius:7px;padding:8px}
.plot-frame svg .line-r{stroke:#2166ae;stroke-width:2.8;fill:none;vector-effect:non-scaling-stroke}
.plot-frame svg .line-s{stroke:#db703a;stroke-width:2.8;fill:none;vector-effect:non-scaling-stroke}
.plot-frame svg .line-s-coincident{stroke:#db703a;stroke-width:3;stroke-dasharray:12 9;opacity:.9;fill:none;vector-effect:non-scaling-stroke}
.plot-frame svg .line-foot{stroke:#c5cfdd;stroke-width:1.75;stroke-dasharray:5 5;fill:none;vector-effect:non-scaling-stroke}
.plot-frame svg .line-arc{stroke:#846c97;stroke-width:2;fill:none;vector-effect:non-scaling-stroke}
.plot-frame svg .line-name{font:800 20px system-ui,sans-serif;paint-order:stroke;stroke:#fff;stroke-width:5;stroke-linejoin:round}
@media(max-width:710px){.line-input-grid{grid-template-columns:1fr}.line-point-editor input{width:72px}}

/* v1.5 — navigazione distinta dei laboratori. */
[hidden], .panel[hidden], .tool-row select[hidden] {display:none!important;}
.tool-row .mode-caption{flex:1;font-size:.9rem;font-weight:700;color:#224d74}


/* v4.0: breadcrumb con tre link e pagina corrente; v4.0.1: preceduto dalla barra comune. */
.breadcrumb{flex-wrap:wrap;gap:7px 9px;overflow-wrap:anywhere}
.breadcrumb a{white-space:normal;text-underline-offset:2px}

/* v4.0.1 — Barra comune del Laboratorio matematico.
   Fallback locale: lo stile ufficiale ../../css/lab-topbar.css, come nel modulo Limiti,
   viene caricato successivamente e ha la precedenza quando disponibile. */
.lab-topbar{width:100%;background:#183e67;color:#fff}
.lab-topbar .lab-topbar-inner{max-width:1340px;margin:0 auto;padding:11px 24px;display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:40px}
.lab-topbar a{color:#fff;text-decoration:none;font-size:.96rem;font-weight:750;white-space:nowrap}
.lab-topbar a:hover{text-decoration:underline;text-underline-offset:3px}
.lab-topbar .lab-tool-version{color:#e7eef9;font-size:.81rem;text-align:right}
@media(max-width:710px){.lab-topbar .lab-topbar-inner{padding:9px 12px;gap:10px}.lab-topbar a{font-size:.87rem}.lab-topbar .lab-tool-version{font-size:.7rem}}


/* Geometria v4.0.2 — leggibilità e spazio utile nei 18 strumenti.
   La home conserva la propria testata editoriale. Nessuna sezione viene nascosta. */
.page:not(.geo-home){padding-top:12px}
.page:not(.geo-home)>.breadcrumb{margin-bottom:10px;font-size:.9rem;line-height:1.5}
.page:not(.geo-home)>.intro{padding:16px 23px;border-radius:15px;gap:10px}
.page:not(.geo-home)>.intro .intro-copy{min-width:0;width:100%}
.page:not(.geo-home)>.intro .eyebrow{font-size:.75rem;letter-spacing:.075em;line-height:1.35}
.page:not(.geo-home)>.intro h1{font-size:clamp(1.65rem,2.4vw,2.05rem);line-height:1.18;margin:3px 0 6px}
.page:not(.geo-home)>.intro p:last-child{max-width:1120px;font-size:.93rem;line-height:1.45}
/* Sono note sul dominio del modello, non notifiche di errore: manteniamo
   il testo integrale, ma senza l'enfasi cromatica di un avviso urgente. */
.page:not(.geo-home)>.notice{background:#edf4fb;border-color:#ccdfef;border-left:3px solid #729fc8;color:#345671;border-radius:9px;padding:9px 13px;margin:11px 0 14px;font-size:.87rem;line-height:1.5}
.page:not(.geo-home) .panel-heading .small-label{font-size:.81rem;color:#526b85;line-height:1.4}
.page:not(.geo-home) .panel-heading{align-items:flex-start;margin-bottom:13px}
.page:not(.geo-home) .panel h2{font-size:1.2rem}
.page:not(.geo-home) .examples{font-size:.86rem;row-gap:3px}
.page:not(.geo-home) .examples button{line-height:1.4;padding:5px 4px;min-height:30px;text-underline-offset:3px}
.page:not(.geo-home) .tool-row button{min-height:38px;min-width:38px}
.page:not(.geo-home) .tool-row .fit{padding-left:12px;padding-right:12px}
.page:not(.geo-home) .graph-panel .panel-heading{margin-bottom:11px}
.page:not(.geo-home) .graph-panel .tool-row{row-gap:7px}
.page:not(.geo-home) .help{color:#506780}
.page:not(.geo-home) .small-label{color:#536d86}
@media (max-width:710px){
 .page:not(.geo-home){padding:10px 12px 25px}
 .page:not(.geo-home)>.breadcrumb{margin-bottom:9px;gap:6px 8px}
 .page:not(.geo-home)>.intro{padding:15px 17px;border-radius:12px}
 .page:not(.geo-home)>.intro h1{font-size:1.65rem}
 .page:not(.geo-home)>.intro p:last-child{font-size:.91rem}
 .page:not(.geo-home)>.notice{padding:9px 11px;margin:9px 0 12px}
 .page:not(.geo-home) .panel-heading{gap:3px 10px}
 .page:not(.geo-home) .graph-panel .tool-row button{min-height:42px;min-width:42px}
}
@media (prefers-reduced-motion:reduce){.page:not(.geo-home){scroll-behavior:auto}}

/* Scorciatoia utile sul telefono: il grafico segue il modulo dei dati. */
.geo-graph-shortcut{display:none}
@media(max-width:920px){
 .geo-graph-shortcut{display:inline-flex;align-items:center;color:#145b9b;font-size:.86rem;font-weight:700;text-underline-offset:3px;min-height:30px}
 #p-graph{scroll-margin-top:12px}
}


/* Geometria v4.0.3 — intestazione funzionale senza doppio blocco blu.
   La barra blu globale e l'home editoriale restano inalterate.
   Le avvertenze matematiche conservano il testo originale. */
.page:not(.geo-home)>.intro{
  background:transparent;
  color:#193d63;
  border:0;
  border-bottom:1px solid #d9e3ee;
  border-radius:0;
  box-shadow:none;
  padding:4px 0 13px;
  display:block;
}
.page:not(.geo-home)>.intro .intro-copy{min-width:0;width:100%}
.page:not(.geo-home)>.intro .eyebrow{
  color:#426d97;
  font-size:.72rem;
  letter-spacing:.075em;
  font-weight:800;
  line-height:1.4;
}
.page:not(.geo-home)>.intro h1{
  color:#163c63;
  font-size:clamp(1.75rem,2.55vw,2.15rem);
  line-height:1.2;
  margin:5px 0 7px;
}
.page:not(.geo-home)>.intro p:last-child{
  color:#506880;
  max-width:1040px;
  font-size:.95rem;
  line-height:1.48;
  margin:0;
}
/* Nota d'uso, non errore: nessun cartiglio colorato sullo sfondo. */
.page:not(.geo-home)>.notice{
  background:transparent;
  border:0;
  border-left:2px solid #b9cbdd;
  border-radius:0;
  color:#5a6d80;
  padding:2px 0 2px 11px;
  margin:11px 0 15px;
  font-size:.84rem;
  line-height:1.5;
}
@media(max-width:710px){
  .page:not(.geo-home)>.intro{padding:2px 0 11px}
  .page:not(.geo-home)>.intro h1{font-size:clamp(1.52rem,5vw,1.8rem);margin:4px 0 6px}
  .page:not(.geo-home)>.intro p:last-child{font-size:.92rem}
  .page:not(.geo-home)>.notice{margin:9px 0 12px;padding:2px 0 2px 9px;font-size:.82rem}
}