:root{font-family:system-ui,-apple-system,Segoe UI,sans-serif;color:#203148;background:#f3f6fa}*{box-sizing:border-box}body{margin:0}.wrap{max-width:1100px;margin:auto;padding:0 18px}.mast{background:#143d67;color:#fff;padding:19px 0}.mast .wrap{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}.brand{font-weight:750;font-size:1.1rem;color:inherit;text-decoration:none}.version{font-size:.9rem;opacity:.82}h1{font-size:clamp(1.8rem,4vw,2.5rem);margin:28px 0 9px}h2{font-size:1.3rem;margin:0 0 17px;color:#193e67}h3{font-size:1.06rem;margin:0 0 7px}.intro p{line-height:1.7;max-width:900px;margin-bottom:20px}.panel{background:white;border:1px solid #dce5ee;border-radius:14px;box-shadow:0 2px 8px #162e470a;padding:23px;margin:17px 0}.fields{display:flex;flex-wrap:wrap;gap:15px;margin-bottom:17px}.field{flex:1 1 185px;min-width:0}.grow{flex:3 1 300px}label{display:block;margin-bottom:6px;font-size:.94rem;font-weight:650}input[type=text],select{display:block;width:100%;min-height:44px;border-radius:8px;border:1px solid #b8c8d9;padding:10px;font:inherit;background:#fff;color:#152a40}#custom{margin-top:8px}button{cursor:pointer;font:inherit}.primary{background:#1764aa;color:white;padding:12px 20px;border:0;border-radius:8px;font-weight:700}.primary:hover{background:#114d84}.primary:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #ffbb56;outline-offset:2px}.hint{color:#53687c;font-size:.92rem;line-height:1.65;margin:13px 0 0}code{background:#f1f5fa;padding:2px 4px;border-radius:3px}.examples{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin-top:15px}.examples>span{font-size:.9rem;color:#54687b}.examples button{background:#eaf2fb;color:#17558b;border:1px solid #d8e6f6;border-radius:6px;padding:6px 10px;font-size:.88rem}.examples button:hover{background:#dbe9f9}.error{background:#fff0f0;border-left:4px solid #bb3131;color:#872222;padding:12px;margin:14px 0 0;border-radius:4px}.big-formula{font-size:1.35rem;background:#f5f8fc;border-radius:9px;text-align:center;padding:22px 10px;overflow-x:auto}.result-note{font-weight:650;text-align:center;font-size:1.1rem}.lateral{padding:12px 16px;border:1px solid #cfdff0;border-radius:8px;display:flex;justify-content:center;gap:30px;flex-wrap:wrap;background:#f8fbff}.lateral[hidden]{display:none}.meaning{padding:12px 14px;background:#f4f8ee;border-left:4px solid #75a849;line-height:1.6}.steps{list-style:none;counter-reset:steps;padding:0;margin:0}.steps li{position:relative;counter-increment:steps;border-top:1px solid #e5ecf3;padding:17px 0 17px 48px}.steps li:first-child{border-top:0}.steps li:before{content:counter(steps);position:absolute;left:0;top:16px;border-radius:50%;width:30px;height:30px;background:#e5f0fa;color:#184d7c;font-weight:750;display:flex;align-items:center;justify-content:center}.steps p{line-height:1.7;margin:4px 0 10px}.step-math{overflow:auto;max-width:100%;padding:11px;background:#f7f9fc;border-radius:6px;text-align:center}.plot-outer{width:100%;overflow:hidden;background:white}.plot{width:100%;height:auto;display:block}.graph-actions{display:flex;align-items:center;gap:13px;flex-wrap:wrap;margin-top:12px}.graph-actions label{margin:0}.graph-actions input{max-width:200px}.graph-key{color:#53687b;font-size:.88rem;display:flex;gap:8px;align-items:center;flex-wrap:wrap}.dot{width:11px;height:11px;border-radius:50%;display:inline-block}.blue{background:#176aac}.red{background:#d55050}.green{background:#268951}.warning{background:#fff8e9;border:1px solid #dbc28a;padding:15px 19px;margin:24px 0;border-radius:9px;line-height:1.65;color:#65491f}.info p{line-height:1.7}footer{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;padding:16px 0 35px;font-size:.95rem}a{color:#1262a2}mjx-container{max-width:100%;overflow-x:auto;overflow-y:hidden}#results[hidden]{display:none}@media(max-width:600px){.panel{padding:17px}.steps li{padding-left:40px}.big-formula{font-size:1rem}.fields{gap:10px}}

[hidden]{display:none!important}
/* Versione 1.02: strumenti del grafico e valori d'avvicinamento. */
.graph-button,.graph-reset{border:1px solid #b9cde0;border-radius:7px;color:#174d78;background:#f2f7fc;font-weight:700;min-height:34px;padding:5px 12px}
.graph-button{font-size:1.2rem;min-width:36px}
.graph-button:hover,.graph-reset:hover{background:#deebf7}
#zoom-label{min-width:2.5em;text-align:center;font-variant-numeric:tabular-nums}
.approach{margin-top:18px;border-top:1px solid #e0e9f2;padding-top:18px}
.approach h3{color:#193e67;margin:0 0 7px}
.approach .hint{margin:0 0 13px}
.table-scroll{overflow-x:auto}
.approach table{border-collapse:collapse;width:100%;min-width:410px;font-variant-numeric:tabular-nums;font-size:.91rem}
.approach th,.approach td{text-align:center;border-bottom:1px solid #dfe9f1;padding:9px 12px}
.approach th{color:#224767;background:#f1f6fb;font-weight:700}
.approach td{color:#253d51}
@media(max-width:600px){.graph-actions{gap:8px}.graph-actions label{width:100%}.graph-actions input{flex:1;min-width:50px}}

/* Migliorie di leggibilità 1.02 */
.steps li h3{line-height:1.4}
.steps li p{max-width:92ch}
.step-math{padding:15px 12px;line-height:1.55}
@media (max-width:600px){.big-formula{padding:16px 7px}.result-note{font-size:.95rem;line-height:1.5}}

/* Versione 1.03: lettura dello studio e tabella d'avvicinamento. */
.step-actions{border-top:1px solid #e4edf5;margin-top:5px;padding-top:16px;display:flex;gap:14px;align-items:center;flex-wrap:wrap}
#copy-status{font-size:.88rem;color:#24613d}
.approach tbody tr:last-child{background:#f0f7ff;font-weight:650}
.step-math{scrollbar-width:thin}
@media(max-width:600px){.steps{padding-left:0}.approach table{font-size:.83rem}.approach th,.approach td{padding:8px 5px}}


/* Versione 1.04: maggiore leggibilità delle dimostrazioni dettagliate */
.steps li h3{color:#173f67;font-size:1.08rem}
.steps li p{line-height:1.8;letter-spacing:.004em}
.step-math{padding:16px 14px;border:1px solid #eaf0f7;background:#f6f9fd}
.step-math mjx-container{font-size:105%!important}
.examples{row-gap:9px}
@media(max-width:600px){.step-math{padding:13px 8px}.steps li p{line-height:1.65}}


/* v1.05: gli aiuti non sottraggono spazio al risultato. */
.syntax-brief{color:#53687c;font-size:.88rem;line-height:1.5;margin:9px 0 0}
.syntax-brief code{white-space:nowrap}
.syntax-brief a{margin-left:.35em;font-weight:600}
.examples{gap:6px;margin-top:9px;row-gap:6px}
.examples button{font-size:.84rem;padding:5px 9px}
.extra-controls{margin-top:8px;color:#415970;font-size:.9rem}
.extra-controls summary,.info-compact summary{cursor:pointer;user-select:none;color:#1a5b94;font-weight:650;line-height:1.5}
.extra-controls[open]{border-top:1px solid #e6edf4;padding-top:9px}
.extra-controls p{line-height:1.6;margin:9px 0 0}
.extra-controls .examples{margin:9px 0 4px}
.info-compact{padding-top:17px;padding-bottom:17px}
.info-compact summary{font-size:1rem}
.info-compact p{margin:12px 0 0;font-size:.93rem}
.result-note{line-height:1.5;margin-bottom:10px}
.result-metadata{font-size:.88rem;color:#4c6178;text-align:center;line-height:1.5;margin:0 0 12px;overflow-wrap:anywhere}
/* Interventi mirati sulla pagina dei passaggi */
.steps li{padding-top:14px;padding-bottom:14px}
.steps li:before{top:14px}
.steps li p{line-height:1.65}
.step-math{padding:12px 11px}
@media(max-width:600px){.syntax-brief{font-size:.83rem}.examples button{font-size:.8rem}}

/* Versione 1.06: risultato esatto e lettura delle rette asintotiche. */
.domain-exact{text-align:center;color:#375269;font-size:.96rem;line-height:1.3;margin:0 0 8px;overflow-x:auto}
.domain-exact mjx-container{margin:0.25em 0!important}

/* v1.07: selezione della scala per i limiti all’infinito */
.graph-actions select{max-width:180px;min-height:34px;padding:4px 9px;border:1px solid #c8d9ea;border-radius:6px;background:#fff;color:#153857;font-size:13px;}
.graph-actions select[hidden],.graph-actions label[hidden]{display:none!important;}

.graph-actions #focus-limit-y-label{display:flex;align-items:center;gap:6px;cursor:pointer;}
.graph-actions #focus-limit-y{accent-color:#176aac;}

/* Limiti oscillanti: legenda degli inviluppi */
.dot.orange{background:#c07821}

/* v1.21: riepilogo compatto per oscillazioni e risultati qualitativi */
.oscillation-summary{margin:12px 0 12px;padding:13px 14px;background:#f7fafc;border:1px solid #d8e6f3;border-radius:10px}
.oscillation-summary h3{margin:0 0 10px;font-size:1rem;color:#193e67}
.oscillation-summary .summary-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:10px}
.oscillation-summary .summary-item{background:#fff;border:1px solid #e3edf6;border-radius:8px;padding:10px 11px}
.oscillation-summary .summary-label{display:block;font-size:.8rem;color:#5b6d7e;margin-bottom:4px;font-weight:700;text-transform:uppercase;letter-spacing:.03em}
.oscillation-summary .summary-value{display:block;color:#213547;font-size:.96rem;line-height:1.5;overflow-wrap:anywhere}
@media(max-width:600px){.oscillation-summary{padding:11px}.oscillation-summary .summary-grid{grid-template-columns:1fr}}

/* v1.22: migliore resa dei simboli del riepilogo con MathJax */
.oscillation-summary .summary-value mjx-container{margin:0!important;font-size:102%!important}
.oscillation-summary .summary-item{min-width:0}

/* v1.23: significato della fascia grafica e calcoli non conclusi. */
.legend-square{display:inline-block;width:12px;height:12px;border-radius:2px;background:#cbddee;border:1px solid #8faac3;vertical-align:middle;flex:none}
.result-status{margin:12px 0 0;padding:11px 13px;border-left:3px solid #bd8448;background:#fff9ee;color:#65491f;line-height:1.5;font-size:.92rem}


/* v1.25 — intestazione coordinata con derivate e integrali.
   Nessuna barra blu: etichetta in alto a sinistra e versione a pillola. */
.mast{background:transparent;color:#142c4d;padding:17px 0 0}
.mast .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;min-height:34px}
.mast .brand{font-size:.83rem;letter-spacing:.105em;text-transform:uppercase;font-weight:800;color:#235ee9;text-decoration:none;line-height:1.35}
.mast .brand:hover{text-decoration:underline;text-underline-offset:3px}
.mast .version{font-size:.83rem;line-height:1.35;font-weight:750;color:#2054d7;background:#e7edff;border-radius:999px;padding:8px 14px;opacity:1;white-space:nowrap}
.intro h1{font-size:clamp(2.1rem,4.3vw,3rem);line-height:1.16;letter-spacing:-.025em;color:#122b4c;margin:16px 0 10px}
.intro p{color:#425b78;margin-top:0}
@media(max-width:600px){
 .mast{padding-top:14px}
 .mast .wrap{gap:8px}
 .mast .brand{font-size:.73rem;letter-spacing:.075em}
 .mast .version{font-size:.74rem;padding:7px 10px}
 .intro h1{margin-top:13px}
}