:root{
  --ink:#10243A;      /* blu notte */
  --cell:#16467A;     /* cella fotovoltaica */
  --cell-2:#1D63B8;
  --blue:#0074D9;     /* blu del logo */
  --sun:#FFDC00;      /* giallo del logo */
  --sun-soft:#FFF6BF;
  --paper:#F4F6F7;
  --white:#FFFFFF;
  --line:#D5DCE1;
  --steel:#5D6E7C;
  --ok:#2E7D4F;
  --r-s:6px; --r-m:12px;
  --wrap:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"IBM Plex Sans",system-ui,sans-serif;font-size:17px;line-height:1.6}
img,svg{max-width:100%;display:block}
a{color:inherit}
:focus-visible{outline:3px solid var(--sun);outline-offset:3px;border-radius:3px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
h1,h2,h3{line-height:1.1;margin:0 0 .5em;letter-spacing:-.015em}
h1{font-size:clamp(2.8rem,6.4vw,5rem);font-weight:600;color:var(--blue);letter-spacing:-.03em;line-height:1}
h1 span{display:block;font-size:.42em;font-weight:400;color:var(--ink);letter-spacing:0;margin-top:.45em}
h2{font-size:clamp(1.8rem,3.4vw,2.5rem);font-weight:600}
h3{font-size:1.2rem;font-weight:600}
p{margin:0 0 1em;max-width:62ch}
.lead{font-size:1.15rem;color:#33475a}

/* --- header --- */
.top{position:sticky;top:0;z-index:20;background:rgba(244,246,247,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:28px;height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--blue);font-size:1.35rem;font-weight:400;letter-spacing:-.01em}
.brand img{width:48px;height:48px}
.nav{display:flex;gap:22px;margin-left:auto;font-size:.95rem}
.nav a{text-decoration:none;color:#33475a}
.nav a:hover{color:var(--ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:var(--r-s);padding:13px 22px;font:inherit;font-weight:650;text-decoration:none;cursor:pointer}
.btn-sun{background:var(--sun);color:var(--ink)}
.btn-sun:hover{background:#ffe83d}
.btn-ink{background:var(--ink);color:#fff}
.btn-ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.top .btn{padding:9px 16px;font-size:.92rem}
.menu-btn{display:none;margin-left:auto;background:none;border:0;padding:8px}
@media (max-width:900px){
  .nav{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;gap:0;background:var(--paper);border-bottom:1px solid var(--line);padding:8px 24px 16px}
  .nav a{padding:10px 0}
  .nav.open{display:flex}
  .menu-btn{display:block}
  .top .btn{display:none}
}

/* --- hero --- */
.hero{padding:64px 0 72px;position:relative;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero h1{max-width:16ch}
.hero .actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.facts{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:34px;padding:0;list-style:none;color:var(--steel);font-size:.95rem}
.facts li{display:flex;align-items:center;gap:8px}
.facts li::before{content:"";width:8px;height:8px;background:var(--sun);border-radius:50%}
@media (max-width:960px){.hero .wrap{grid-template-columns:1fr;gap:40px}}

/* modulo-stimatore */
.module{background:var(--ink);color:#fff;border-radius:var(--r-m);padding:10px;box-shadow:0 30px 60px -30px rgba(19,33,46,.55)}
.module-frame{border:2px solid #3b5468;border-radius:8px;padding:26px 26px 22px;
  background:
   linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px) 0 0/calc(100%/6) 100%,
   linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px) 0 0/100% 56px,
   linear-gradient(160deg,var(--cell-2),var(--cell) 60%,#18304a)}
.module h2{font-size:1.45rem;margin-bottom:4px}
.module .sub{color:#b8c8d6;font-size:.95rem;margin-bottom:20px}
.seg{display:inline-flex;background:rgba(0,0,0,.25);border-radius:var(--r-s);padding:4px;margin-bottom:22px}
.seg button{background:none;border:0;color:#cfdbe5;font:inherit;font-size:.95rem;padding:8px 16px;border-radius:4px;cursor:pointer}
.seg button[aria-pressed=true]{background:var(--sun);color:var(--ink);font-weight:650}
.range-row{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:6px}
.range-row output{font-size:1.6rem;font-weight:600}
input[type=range]{width:100%;accent-color:var(--sun);height:28px}
.result{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}
.result div{background:rgba(0,0,0,.22);border-radius:8px;padding:14px 16px}
.result strong{display:block;font-size:1.55rem;font-weight:600;color:var(--sun)}
.result span{font-size:.85rem;color:#b8c8d6}
.module .note{font-size:.8rem;color:#9fb2c2;margin:14px 0 0}
.module .btn{width:100%;margin-top:16px}

/* --- sezioni --- */
section{padding:88px 0}
.band-white{background:var(--white)}
.band-ink{background:var(--ink);color:#fff}
.band-ink .lead,.band-ink p{color:#c3d1dc}
.head{max-width:720px;margin-bottom:44px}

.split{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);border-radius:var(--r-m);overflow:hidden}
.split article{padding:40px}
.split article+article{border-left:1px solid var(--line);background:#fbfcfc}
.split ul{padding-left:1.1em;margin:0}
.split li{margin:.35em 0}
.split .tag{display:inline-block;background:var(--sun-soft);color:#6b4700;font-size:.85rem;font-weight:650;padding:3px 10px;border-radius:20px;margin-bottom:14px}
@media (max-width:820px){.split{grid-template-columns:1fr}.split article+article{border-left:0;border-top:1px solid var(--line)}.split article{padding:28px}}

.kit{display:grid;grid-template-columns:repeat(5,1fr);gap:28px;margin-top:8px}
.kit div{border-top:3px solid var(--sun);padding-top:16px}
.kit p{font-size:.97rem;color:#c3d1dc}
@media (max-width:1100px){.kit{grid-template-columns:repeat(3,1fr)}}
@media (max-width:760px){.kit{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.kit{grid-template-columns:1fr}}

.steps{list-style:none;padding:0;margin:0;counter-reset:s;display:grid;grid-template-columns:repeat(6,1fr);gap:0;position:relative}
.steps li{counter-increment:s;padding:0 18px 0 0;position:relative}
.steps li::before{content:counter(s);display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:var(--ink);color:var(--sun);font-weight:800;margin-bottom:16px;position:relative;z-index:1}
.steps::before{content:"";position:absolute;left:22px;right:40px;top:22px;height:2px;background:var(--line)}
.steps p{font-size:.96rem;color:#3d5164}
@media (max-width:900px){.steps{grid-template-columns:1fr;gap:22px}.steps::before{left:21px;right:auto;top:10px;bottom:10px;width:2px;height:auto}.steps li{padding-left:64px}.steps li::before{position:absolute;left:0;top:0}}

.why{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:start}
.why blockquote{margin:0;padding:28px 30px;background:var(--sun-soft);border-radius:var(--r-m);font-size:1.15rem;line-height:1.5}
.why dl{margin:0}
.why dt{font-weight:700;margin-top:18px}
.why dd{margin:4px 0 0;color:#3d5164}
@media (max-width:900px){.why{grid-template-columns:1fr;gap:28px}}

.incent{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.incent > div{background:var(--white);border:1px solid var(--line);border-radius:var(--r-m);padding:26px}
.incent .big{font-size:2.2rem;font-weight:600;color:var(--blue);line-height:1;margin-bottom:10px}
.incent p{font-size:.96rem;color:#3d5164;margin:0}
.small{font-size:.85rem;color:var(--steel);margin-top:20px}
@media (max-width:900px){.incent{grid-template-columns:1fr}}

.faq{max-width:820px}
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{cursor:pointer;font-weight:650;font-size:1.06rem;list-style:none;display:flex;justify-content:space-between;gap:20px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.4rem;line-height:1;color:var(--steel)}
.faq details[open] summary::after{content:"–"}
.faq details p{margin:12px 0 0;color:#3d5164}

.contact{display:grid;grid-template-columns:.85fr 1.15fr;gap:56px}
.contact address{font-style:normal;line-height:1.9}
.contact address a{text-decoration:none;font-weight:650}
form.f{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.f label{display:flex;flex-direction:column;gap:6px;font-size:.92rem;font-weight:600}
.f .full{grid-column:1/-1}
.f input,.f select,.f textarea{font:inherit;font-weight:400;padding:12px 14px;border:1.5px solid var(--line);border-radius:var(--r-s);background:#fff;color:var(--ink)}
.f input:focus,.f select:focus,.f textarea:focus{border-color:var(--cell-2);outline:none;box-shadow:0 0 0 3px rgba(40,80,111,.2)}
.f .check{flex-direction:row;align-items:flex-start;font-weight:400;font-size:.88rem;color:#3d5164}
.f .check input{margin-top:4px}
.f .hp{position:absolute;left:-9999px}
.msg{padding:14px 16px;border-radius:var(--r-s);margin-bottom:18px}
.msg.ok{background:#e3f3e9;color:#1d5535}
.msg.err{background:#fbe5e3;color:#8a2a1f}
@media (max-width:860px){.contact{grid-template-columns:1fr;gap:32px}form.f{grid-template-columns:1fr}}

footer{background:var(--ink);color:#aebfcd;padding:44px 0;font-size:.9rem}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px;align-items:center}
.f-brand{display:flex;gap:14px;align-items:center}
.f-brand img{background:#fff;border-radius:50%;padding:3px}
footer a{color:#fff}
.wa{position:fixed;right:18px;bottom:18px;width:56px;height:56px;border-radius:50%;background:#25D366;display:grid;place-items:center;box-shadow:0 8px 20px rgba(0,0,0,.25);z-index:30}
.wa svg{width:30px;height:30px}

/* --- recensioni --- */
.rec-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap;max-width:none}
.rec-media{display:flex;align-items:center;gap:8px;color:var(--steel);margin:0}
.rec-media strong{color:var(--ink);font-size:1.2rem}
.stars{color:var(--sun);letter-spacing:2px;font-size:1.1rem}
.stars .off{color:var(--line)}
.reviews{columns:3 300px;column-gap:24px;margin-bottom:32px}
.review{break-inside:avoid;margin:0 0 24px;background:var(--white);border:1px solid var(--line);border-radius:var(--r-m);padding:24px}
.review blockquote{margin:12px 0 16px;font-size:1.02rem;line-height:1.55}
.review figcaption{font-size:.92rem;color:var(--steel)}
.review figcaption strong{color:var(--ink)}
.review figcaption span{display:block;font-size:.85rem}

/* --- slogan --- */
.slogan{background:var(--sun);color:var(--ink)}
.slogan p{margin:0 auto;padding-top:22px;padding-bottom:22px;max-width:var(--wrap);font-size:clamp(1.15rem,2.2vw,1.5rem);font-weight:500;font-style:italic;text-align:center}

/* --- illustrazioni --- */
.illu{margin:-8px 0 22px;border-radius:var(--r-m);overflow:hidden}
.illu svg{width:100%;height:auto}
.integ{display:grid;grid-template-columns:1fr 1.05fr;gap:56px;align-items:center}
.integ .diagram{margin:0;background:var(--white);border:1px solid var(--line);border-radius:var(--r-m);padding:22px}
.integ .diagram svg{width:100%;height:auto}
.checks{list-style:none;padding:0;margin:0}
.checks li{position:relative;padding-left:34px;margin:12px 0}
.checks li::before{content:"";position:absolute;left:0;top:4px;width:20px;height:20px;border-radius:50%;background:var(--sun) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='m5 10 3.5 3.5L15 7' fill='none' stroke='%2310243A' stroke-width='2.4'/%3E%3C/svg%3E") center/16px no-repeat}
@media (max-width:960px){.integ{grid-template-columns:1fr;gap:32px}}

/* --- galleria --- */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px}
.gallery figure{margin:0}
.g-open{display:block;padding:0;border:0;background:none;cursor:zoom-in;width:100%;border-radius:var(--r-m);overflow:hidden}
.gallery img{display:block;width:100%;height:auto;aspect-ratio:4/3;object-fit:cover}
.gallery figcaption{font-size:.92rem;color:var(--steel);margin-top:8px}
.lightbox{border:0;padding:0;background:transparent;max-width:min(1200px,94vw);max-height:92vh}
.lightbox::backdrop{background:rgba(16,36,58,.88)}
.lightbox img{max-width:100%;max-height:82vh;border-radius:8px;margin:0 auto}
.lightbox p{color:#fff;text-align:center;margin:10px auto 0}
.lightbox form{position:absolute;top:8px;right:8px}
.lightbox form button{width:42px;height:42px;border-radius:50%;border:0;background:rgba(255,255,255,.9);font-size:1.6rem;cursor:pointer}