/* ============================================================
   H2D ENERGY · Hybrid Energy Storage
   Palette: carbon #04272B · paper #F6F8F2 · ink #0B4046
            hydro (idrogeno) #E7EDAD · solar (fotovoltaico) #C6D2CC
   Type: Archivo (display + body) · IBM Plex Mono (dati, etichette)
   Firma visiva: l'onda di linearizzazione (input intermittente
   che diventa potenza costante attraversando HyVault)
   ============================================================ */

:root{
  --carbon:#04272B;
  --carbon-2:#0B4046;
  --paper:#F6F8F2;
  --paper-2:#EDF1E0;
  --ink:#0B4046;
  --ink-soft:#595959;
  --hydro:#E7EDAD;
  --hydro-deep:#557313;
  --solar:#C6D2CC;
  --line:#DAE0D4;
  --line-dark:rgba(255,255,255,.12);
  --radius:14px;
  --max:1180px;
  --font-display:"Archivo",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,monospace;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-display);
  background:var(--paper);
  color:var(--ink);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
::selection{background:var(--hydro);color:var(--carbon)}

.wrap{max-width:var(--max);margin:0 auto;padding:0 28px}

/* ---------- Nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(244,247,246,.85);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  max-width:var(--max);margin:0 auto;padding:0 28px;
  height:68px;display:flex;align-items:center;justify-content:space-between;
}
.logo{display:flex;align-items:baseline;gap:10px;font-weight:800;letter-spacing:.02em;font-size:1.15rem}
.logo .h2{color:var(--hydro-deep)}
.logo .tag{font-family:var(--font-mono);font-size:.62rem;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-soft);font-weight:400}
.nav-links{display:flex;gap:34px;align-items:center}
.nav-links a{
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--ink-soft);padding:6px 0;border-bottom:2px solid transparent;transition:color .2s,border-color .2s;
}
.nav-links a:hover{color:var(--ink)}
.nav-links a.active{color:var(--ink);border-color:var(--hydro)}
.nav-cta{
  background:var(--carbon);color:#fff;padding:10px 20px;border-radius:999px;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.1em;text-transform:uppercase;
  transition:background .2s;
}
.nav-cta:hover{background:var(--hydro-deep)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;font-size:1.5rem;color:var(--ink)}

/* ---------- Etichette e titoli ---------- */
.eyebrow{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--hydro-deep);display:flex;align-items:center;gap:12px;margin-bottom:18px;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--hydro-deep)}
.dark .eyebrow::before{background:var(--hydro)}
.dark .eyebrow{color:var(--hydro)}
h1,h2,h3{font-weight:800;letter-spacing:-.02em;line-height:1.08}
h1{font-size:clamp(2.6rem,5.6vw,4.4rem)}
h2{font-size:clamp(1.9rem,3.4vw,2.7rem);margin-bottom:20px}
h3{font-size:1.15rem;letter-spacing:-.01em;line-height:1.3}
.lead{font-size:1.15rem;color:var(--ink-soft);max-width:640px}
.dark .lead{color:rgba(255,255,255,.68)}

section{padding:96px 0}
.section-head{max-width:720px;margin-bottom:56px}

/* ---------- Hero ---------- */
.dark{background:var(--carbon);color:#fff}
.hero{padding:110px 0 0;overflow:hidden;position:relative;background:var(--paper)}
.hero .wrap{position:relative;z-index:2}
.hero h1 .accent{color:var(--hydro-deep)}
.hero-actions{display:flex;gap:16px;margin-top:36px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:10px;padding:14px 28px;border-radius:999px;
  font-family:var(--font-mono);font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;
  transition:transform .2s,background .2s,color .2s;border:1px solid transparent;
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--hydro);color:var(--carbon);font-weight:600}
.btn-primary:hover{background:#F0F4C9}
.btn-ghost{border-color:var(--line-dark);color:#fff}
.btn-ghost:hover{border-color:var(--hydro);color:var(--hydro)}
.btn-dark{background:var(--carbon);color:#fff}
.btn-dark:hover{background:var(--hydro-deep)}
.btn-outline{border-color:var(--carbon);color:var(--carbon)}
.btn-outline:hover{border-color:var(--hydro-deep);color:var(--hydro-deep)}

/* Firma: onda di linearizzazione */
.linearize{margin-top:64px;position:relative}
.linearize svg{width:100%;height:auto}
.lin-labels{
  display:flex;justify-content:space-between;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink-soft);padding:10px 4px 34px;
}
.lin-labels .mid{color:var(--hydro-deep)}
@keyframes flow{to{stroke-dashoffset:-400}}
.flow-in{stroke-dasharray:6 8;animation:flow 14s linear infinite}
.flow-out{stroke-dasharray:14 10;animation:flow 12s linear infinite}
@keyframes pulse{0%,100%{opacity:.55}50%{opacity:1}}
.vault-glow{animation:pulse 3.2s ease-in-out infinite}
@media (prefers-reduced-motion:reduce){
  .flow-in,.flow-out,.vault-glow{animation:none}
  html{scroll-behavior:auto}
}

/* ---------- KPI strip ---------- */
.kpi-strip{background:var(--carbon-2);border-top:1px solid var(--line-dark);padding:0}
.kpi-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.kpi{padding:36px 28px;border-left:1px solid var(--line-dark)}
.kpi:first-child{border-left:0}
.kpi .num{font-family:var(--font-mono);font-size:2rem;font-weight:600;color:var(--hydro)}
.kpi .num sup{font-size:.9rem}
.kpi .lbl{font-size:.85rem;color:rgba(255,255,255,.6);margin-top:6px}

/* ---------- Cards ---------- */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:32px;transition:transform .25s,box-shadow .25s;
}
.card:hover{transform:translateY(-4px);box-shadow:0 16px 40px rgba(4,39,43,.10)}
.card h3{margin-bottom:12px}
.card p{color:var(--ink-soft);font-size:.95rem}
.card .idx{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em;color:var(--hydro-deep);
  text-transform:uppercase;margin-bottom:16px;display:block;
}
.icon-dot{
  width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:rgba(131,137,53,.12);color:var(--hydro-deep);margin-bottom:18px;font-size:1.2rem;
}
.icon-dot.solar{background:rgba(12,105,112,.10);color:#0C6970}

.dark .card{background:var(--carbon-2);border-color:var(--line-dark)}
.dark .card p{color:rgba(255,255,255,.62)}
.dark .card:hover{box-shadow:0 16px 40px rgba(0,0,0,.4)}

/* ---------- Problema (due colonne contrapposte) ---------- */
.tradeoff{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.tradeoff>div{padding:40px}
.tradeoff .a{background:#fff;border-right:1px solid var(--line)}
.tradeoff .b{background:var(--paper-2)}
.tradeoff h3{margin-bottom:14px}
.tradeoff ul{list-style:none;margin-top:16px}
.tradeoff li{
  padding:10px 0 10px 26px;position:relative;color:var(--ink-soft);font-size:.95rem;
  border-top:1px dashed var(--line);
}
.tradeoff li::before{content:"↳";position:absolute;left:0;color:var(--hydro-deep);font-weight:700}

/* ---------- Team ---------- */
.team-card{text-align:left}
.avatar{
  width:84px;height:84px;border-radius:50%;
  background:linear-gradient(135deg,var(--hydro-deep),var(--carbon));
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:1.5rem;letter-spacing:.02em;margin-bottom:20px;
}
.avatar.v2{background:linear-gradient(135deg,#838935,#04272B)}
.avatar.v3{background:linear-gradient(135deg,#595959,var(--carbon))}
img.avatar{width:96px;height:96px;object-fit:cover;object-position:center top;background:#cdcecc;box-shadow:0 6px 18px rgba(0,0,0,.25)}
.role{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--hydro-deep);margin:4px 0 14px;
}

/* ---------- Partner ---------- */
.partner-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.partner{
  border:1px dashed var(--line);border-radius:var(--radius);padding:28px;background:#fff;
  display:flex;flex-direction:column;gap:8px;min-height:150px;justify-content:center;
}
.partner .type{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft)}
.partner strong{font-size:1.02rem}

/* ---------- Progetti ---------- */
.project{
  display:grid;grid-template-columns:340px 1fr;gap:0;border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;background:#fff;margin-bottom:28px;
}
.project-side{
  background:var(--carbon);color:#fff;padding:36px;display:flex;flex-direction:column;justify-content:space-between;gap:28px;
}
.project-side .loc{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--hydro)}
.project-side h3{font-size:1.5rem;margin-top:10px}
.project-side .power{font-family:var(--font-mono);font-size:2.2rem;font-weight:600}
.project-side .power span{font-size:1rem;color:rgba(255,255,255,.55)}
.project-body{padding:36px}
.project-body p{color:var(--ink-soft);margin-bottom:18px}
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;
  border:1px solid var(--line);border-radius:999px;padding:7px 14px;color:var(--ink-soft);
}
.chip.on{border-color:var(--hydro-deep);color:var(--hydro-deep);background:rgba(131,137,53,.08)}
.status{
  display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);
  font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.7);
}
.status::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--hydro);box-shadow:0 0 10px var(--hydro)}
.status.amber::before{background:var(--solar);box-shadow:0 0 10px var(--solar)}

/* ---------- Roadmap ---------- */
.roadmap{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;counter-reset:fase}
.phase{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;position:relative}
.phase .t{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--hydro-deep);margin-bottom:12px;
}
.phase h3{margin-bottom:10px}
.phase p{color:var(--ink-soft);font-size:.92rem}

/* ---------- CTA band ---------- */
.cta-band{position:relative;overflow:hidden}
.cta-band .wrap{position:relative;z-index:2;text-align:center;max-width:760px}
.cta-band h2{font-size:clamp(2rem,4vw,3.2rem)}
.cta-band p{color:rgba(255,255,255,.65);margin:18px auto 34px;max-width:560px}

/* ---------- Footer ---------- */
footer{background:var(--carbon);color:rgba(255,255,255,.6);border-top:1px solid var(--line-dark)}
.foot-inner{
  max-width:var(--max);margin:0 auto;padding:48px 28px;
  display:flex;justify-content:space-between;gap:32px;flex-wrap:wrap;align-items:flex-start;
}
.foot-inner .logo{color:#fff}
.foot-links{display:flex;gap:28px;font-family:var(--font-mono);font-size:.75rem;letter-spacing:.12em;text-transform:uppercase}
.foot-links a:hover{color:var(--hydro)}
.foot-note{
  max-width:var(--max);margin:0 auto;padding:0 28px 40px;
  font-size:.78rem;color:rgba(255,255,255,.35);
}

/* Contrasto etichette su fondo scuro */
.dark .role,.dark .idx,.dark .phase .t{color:var(--hydro)}

.howit{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px}
.howit svg,.howit .howit-video{width:100%;height:auto;display:block;border-radius:calc(var(--radius) - 8px)}
@media (max-width:680px){.howit{padding:14px}.howit svg{min-width:760px}}

/* ---------- Reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
}

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .grid-3,.grid-4,.partner-grid,.roadmap{grid-template-columns:repeat(2,1fr)}
  .kpi-grid{grid-template-columns:repeat(2,1fr)}
  .kpi{border-top:1px solid var(--line-dark)}
  .project{grid-template-columns:1fr}
}
@media (max-width:680px){
  section{padding:64px 0}
  .grid-2,.grid-3,.grid-4,.partner-grid,.roadmap,.tradeoff{grid-template-columns:1fr}
  .tradeoff .a{border-right:0;border-bottom:1px solid var(--line)}
  .nav-links{
    display:none;position:absolute;top:68px;left:0;right:0;
    background:var(--paper);border-bottom:1px solid var(--line);
    flex-direction:column;gap:0;padding:12px 28px 20px;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 0}
  .nav-toggle{display:block}
  .nav-cta{display:none}
  .nav-inner{padding:0 20px}
  .lang-switch button{padding:6px 5px;font-size:.68rem}
  h1{font-size:clamp(2.05rem,7.5vw,2.9rem)}
  .hero{padding-top:90px}
  .lead{font-size:1.05rem}
  .kpi .num{font-size:1.6rem}
  .foot-inner{gap:24px}
}


.logo img{height:38px;width:auto}
.foot-inner .logo img{height:44px}
@media (max-width:680px){.logo img{height:30px}.foot-inner .logo img{height:34px}}
@media (max-width:400px){
  .logo img{height:26px}
  .lang-switch button{padding:5px 4px;font-size:.64rem;letter-spacing:.04em}
}