/* Kelbo — sito statico. Tema scuro come l'applicazione; chiaro se il sistema lo chiede. */
:root{
  --bg:#0d1117;--surface:#161b22;--surface2:#1c2333;--border:#30363d;--text:#e6edf3;--muted:#8b949e;
  --accent:#388bfd;--accent2:#bc8cff;--success:#3fb950;--code:#0b0f14;
  --font:'SF Mono',ui-monospace,Menlo,Consolas,'Liberation Mono',monospace;
  --sans:-apple-system,BlinkMacSystemFont,'Segoe UI','Inter',Roboto,Helvetica,Arial,sans-serif;
  --radius:10px;--wrap:1180px;
  color-scheme:dark;
}
@media (prefers-color-scheme: light){
  :root{--bg:#ffffff;--surface:#f6f8fa;--surface2:#eef1f5;--border:#d0d7de;--text:#1f2328;--muted:#59636e;--code:#f6f8fa;color-scheme:light}
  .hero{background:radial-gradient(1200px 500px at 70% -10%,rgba(56,139,253,.12),transparent 60%),radial-gradient(900px 400px at 0% 0%,rgba(188,140,255,.10),transparent 60%)}
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 var(--sans);-webkit-font-smoothing:antialiased}
a{color:var(--accent)}
a:hover{text-decoration-thickness:2px}
img{max-width:100%;height:auto;display:block}
code{font-family:var(--font);font-size:.88em;background:var(--surface2);border:1px solid var(--border);border-radius:5px;padding:.05em .35em}
pre{background:var(--code);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px;overflow:auto;line-height:1.55}
pre code{background:none;border:none;padding:0;font-size:14px}
h1,h2,h3{line-height:1.2;margin:0 0 .5em}
h2{font-size:clamp(26px,3.2vw,34px);letter-spacing:-.01em}
h3{font-size:17px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.narrow{max-width:820px}
.center{text-align:center}
.muted{color:var(--muted)}
.small{font-size:14px}
.skip{position:absolute;left:-999px;top:8px;background:var(--accent);color:#fff;padding:8px 12px;border-radius:6px;z-index:100}
.skip:focus{left:8px}

/* barra in alto */
.topbar{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.topbar-inner{display:flex;align-items:center;gap:24px;height:60px}
.logo{font-family:var(--font);font-weight:700;font-size:20px;color:var(--text);text-decoration:none;letter-spacing:-.02em}
.logo span{color:var(--accent)}
.logo-sm{font-size:15px}
.nav{display:flex;gap:20px;margin-inline-start:12px}
.nav a{color:var(--muted);text-decoration:none;font-size:14px}
.nav a:hover{color:var(--text)}
.topbar-end{margin-inline-start:auto;display:flex;align-items:center;gap:10px}
.lang{font-family:var(--font);font-size:12px;color:var(--muted);text-decoration:none;border:1px solid var(--border);border-radius:6px;padding:4px 8px}
.lang:hover{color:var(--text);border-color:var(--muted)}

/* pulsanti */
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:8px;font-weight:600;font-size:15px;text-decoration:none;border:1px solid transparent;transition:transform .12s,background .15s,border-color .15s}
.btn:hover{transform:translateY(-1px)}
.btn-sm{padding:6px 12px;font-size:13px}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#4c97ff}
.btn-ghost{color:var(--text);border-color:var(--border);background:var(--surface)}
.btn-ghost:hover{border-color:var(--muted)}
.btn-paypal{background:#ffc439;color:#111;font-size:17px;padding:14px 28px;border-radius:999px}
.btn-paypal:hover{background:#f2b52e}

/* hero */
.hero{padding:72px 0 56px;background:radial-gradient(1200px 500px at 70% -10%,rgba(56,139,253,.18),transparent 60%),radial-gradient(900px 400px at 0% 0%,rgba(188,140,255,.14),transparent 60%)}
.hero-inner{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:48px;align-items:center}
.eyebrow{font-family:var(--font);font-size:13px;color:var(--accent2);margin:0 0 14px;letter-spacing:.02em}
h1{font-size:clamp(34px,4.6vw,54px);letter-spacing:-.025em}
h1 strong{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:18px;color:var(--muted);margin:0 0 26px}
.lead code{color:var(--text)}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:26px}
.hero-points{list-style:none;padding:0;margin:0;display:grid;gap:8px;font-size:15px;color:var(--muted)}
.hero-points li::before{content:'✓';color:var(--success);margin-inline-end:10px;font-weight:700}
.shot{display:block;padding:0;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:var(--surface);cursor:zoom-in;box-shadow:0 20px 50px rgba(0,0,0,.35);transition:transform .2s,box-shadow .2s;width:100%}
.shot:hover{transform:translateY(-2px);box-shadow:0 26px 60px rgba(0,0,0,.45)}
.hero-shot{transform:perspective(1600px) rotateY(-4deg)}
.hero-shot:hover{transform:perspective(1600px) rotateY(0)}

/* sezioni */
.section{padding:80px 0}
.section.alt{background:var(--surface);border-block:1px solid var(--border)}
.section-lead{color:var(--muted);font-size:17px;max-width:760px;margin:0 0 32px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.card{background:var(--bg);border:1px solid var(--border);border-top:3px solid var(--accent);border-radius:var(--radius);padding:20px}
.section:not(.alt) .card{background:var(--surface)}
.card h3{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.card-icon{font-size:20px}
.card p{margin:0;color:var(--muted);font-size:15px}
.card h3 code{font-size:12px;color:var(--muted);font-weight:400}
.ext-more{margin-top:32px;max-width:820px}
.ext-more pre{margin:8px 0 20px}

/* galleria */
.gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
.gallery figure{margin:0}
.gallery figcaption{margin-top:10px;color:var(--muted);font-size:15px}
.gallery figcaption strong{color:var(--text)}
.gallery .shot{box-shadow:0 10px 30px rgba(0,0,0,.3)}

.reqs{padding-inline-start:20px;color:var(--muted)}
.reqs li{margin:4px 0}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.repos{list-style:none;padding:0;margin:0 0 16px;display:grid;gap:10px}
.repos a{display:inline-flex;align-items:center;gap:8px;font-family:var(--font);font-size:14px;font-weight:600}
.donate{background:radial-gradient(700px 300px at 50% 0%,rgba(255,196,57,.12),transparent 70%)}
.donate p{font-size:17px}

.footer{border-top:1px solid var(--border);padding:28px 0;color:var(--muted);font-size:14px}
.footer-inner{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.footer a{color:var(--muted)}

/* lightbox */
.lightbox{border:none;padding:0;background:transparent;max-width:96vw;max-height:96vh;overflow:visible}
.lightbox::backdrop{background:rgba(1,4,9,.88)}
.lightbox figure{margin:0}
.lightbox img{max-width:92vw;max-height:84vh;border-radius:8px;border:1px solid var(--border)}
.lightbox figcaption{color:#e6edf3;text-align:center;margin-top:10px;font-size:15px}
.lightbox button{position:fixed;background:rgba(22,27,34,.8);color:#e6edf3;border:1px solid #30363d;border-radius:50%;width:44px;height:44px;font-size:26px;line-height:1;cursor:pointer}
.lightbox button:hover{background:#30363d}
.lb-close{top:16px;right:16px}
.lb-prev{left:16px;top:50%;transform:translateY(-50%)}
.lb-next{right:16px;top:50%;transform:translateY(-50%)}

@media (max-width:900px){
  .nav{display:none}
  .hero{padding:48px 0 40px}
  .hero-inner,.two-col{grid-template-columns:1fr;gap:32px}
  .hero-shot,.hero-shot:hover{transform:none}
  .gallery{grid-template-columns:1fr}
  .section{padding:56px 0}
}
@media (max-width:480px){
  .wrap{padding:0 16px}
  .topbar-end .btn span{display:none}
}
@media (prefers-reduced-motion: reduce){*{transition:none!important;scroll-behavior:auto!important}}
/* numero dispari di screenshot: l'ultimo al centro */
@media (min-width:901px){.gallery figure:last-child:nth-child(odd){grid-column:1/-1;justify-self:center;width:calc(50% - 14px)}}