/* ==========================================================================
   BLACKSTAR DIGITAL STUDIO — Design System v2 (giugno 2026)
   Mobile-first · dark premium · oro/nero · zero scroll orizzontale
   ========================================================================== */

:root{
  --bg:#08080d;
  --bg-2:#0d0d15;
  --surface:#12121c;
  --surface-2:#171724;
  --line:#262635;
  --gold:#d9b24a;
  --gold-soft:#f0d488;
  --text:#f4f2ec;
  --muted:#aaa6b6;
  --ok:#7dd87d;
  --bad:#ff8d7e;
  --radius:14px;
  --radius-lg:20px;
  --maxw:1120px;
  --font-display:"Space Grotesk",system-ui,sans-serif;
  --font-body:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  font-size:1rem;
  line-height:1.6;
  overflow-x:clip;
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%,rgba(217,178,74,.08),transparent),
    radial-gradient(1px 1px at 20% 30%,rgba(255,255,255,.25),transparent),
    radial-gradient(1px 1px at 70% 60%,rgba(255,255,255,.18),transparent),
    radial-gradient(1.5px 1.5px at 85% 20%,rgba(255,255,255,.22),transparent),
    radial-gradient(1px 1px at 40% 80%,rgba(255,255,255,.15),transparent);
}
img,svg,video{max-width:100%;height:auto;display:block}
a{color:var(--gold-soft);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:3px solid var(--gold);outline-offset:3px;border-radius:4px}

h1,h2,h3,h4{font-family:var(--font-display);line-height:1.15;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(2rem,5.5vw + .8rem,3.6rem);font-weight:700}
h2{font-size:clamp(1.5rem,3vw + .6rem,2.4rem);font-weight:700}
h3{font-size:clamp(1.1rem,1vw + .85rem,1.35rem);font-weight:600}
p{margin:0 0 1em}
.lead{font-size:clamp(1.05rem,.6vw + .95rem,1.25rem);color:var(--muted);max-width:60ch}

.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(1rem,4vw,2rem)}
section{padding-block:clamp(3rem,8vw,5.5rem)}
.section-head{margin-bottom:clamp(1.5rem,4vw,2.5rem);max-width:62ch}

/* eyebrow / kicker */
.eyebrow{
  display:inline-flex;align-items:center;gap:.5rem;
  font-family:var(--font-display);font-size:.8rem;font-weight:600;
  letter-spacing:.14em;text-transform:uppercase;color:var(--gold);
  margin-bottom:1rem;
}
.eyebrow::before{content:"";width:1.6rem;height:1px;background:var(--gold);flex:none}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(8,8,13,.85);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:1rem;min-height:64px;max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(1rem,4vw,2rem)}
.brand{font-family:var(--font-display);font-weight:700;font-size:1.15rem;color:var(--text);white-space:nowrap}
.brand:hover{text-decoration:none}
.brand .star{color:var(--gold)}
.nav-toggle{display:none}
.nav-burger{
  margin-left:auto;display:flex;flex-direction:column;justify-content:center;gap:5px;
  width:48px;height:48px;padding:12px;cursor:pointer;border:1px solid var(--line);border-radius:10px;background:transparent;
}
.nav-burger span{display:block;height:2px;background:var(--text);border-radius:2px;transition:transform .2s,opacity .2s}
.nav-links{
  display:none;flex-direction:column;gap:.25rem;
  position:absolute;inset-inline:0;top:100%;
  background:var(--bg-2);border-bottom:1px solid var(--line);
  padding:1rem clamp(1rem,4vw,2rem) 1.25rem;
}
.nav-links a{
  display:flex;align-items:center;min-height:48px;padding:.4rem .75rem;border-radius:10px;
  color:var(--text);font-weight:500;
}
.nav-links a:hover{background:var(--surface);text-decoration:none;color:var(--gold-soft)}
.nav-links .nav-cta{
  background:var(--gold);color:#161204;font-weight:700;justify-content:center;margin-top:.5rem;
}
.nav-links .nav-cta:hover{background:var(--gold-soft);color:#161204}
.nav-toggle:checked ~ .nav-links{display:flex}
.nav-toggle:checked ~ .nav-burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle:checked ~ .nav-burger span:nth-child(2){opacity:0}
.nav-toggle:checked ~ .nav-burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

@media (min-width:860px){
  .nav-burger{display:none}
  .nav-links{
    display:flex;flex-direction:row;align-items:center;gap:.25rem;
    position:static;background:transparent;border:0;padding:0;margin-left:auto;
  }
  .nav-links a{min-height:44px;padding:.3rem .85rem}
  .nav-links .nav-cta{margin:0 0 0 .5rem;padding-inline:1.1rem;border-radius:999px}
}

/* ===== Hero ===== */
.hero{padding-block:clamp(3.5rem,10vw,7rem) clamp(3rem,8vw,5rem)}
.hero h1{max-width:16ch}
.hero h1 .gold{color:var(--gold)}
.hero .lead{margin-block:1.25rem 2rem}

/* chips (sostituiscono il marquee: niente animazioni che rompono il mobile) */
.chips{display:flex;flex-wrap:wrap;gap:.5rem;padding:0;margin:1.5rem 0 0;list-style:none}
.chips li{
  font-family:var(--font-display);font-size:.78rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;
  color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:.45rem .85rem;background:var(--bg-2);
}
.chips li.gold{color:var(--gold);border-color:rgba(217,178,74,.4)}

/* ===== Buttons ===== */
.btn-row{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  min-height:52px;padding:.8rem 1.6rem;border-radius:999px;
  font-family:var(--font-display);font-weight:700;font-size:1rem;
  cursor:pointer;border:1px solid transparent;transition:transform .15s,background .2s;
  touch-action:manipulation;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--gold);color:#161204}
.btn-primary:hover{background:var(--gold-soft)}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold-soft)}
.btn-block-note{font-size:.85rem;color:var(--muted);margin-top:.75rem}

/* ===== Cards & grids ===== */
.grid{display:grid;gap:1rem}
.grid-2{grid-template-columns:1fr}
.grid-3{grid-template-columns:1fr}
.grid-4{grid-template-columns:1fr 1fr}
@media (min-width:640px){
  .grid-2{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:960px){
  .grid-3{grid-template-columns:repeat(3,1fr)}
  .grid-4{grid-template-columns:repeat(4,1fr)}
}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:clamp(1.1rem,2.5vw,1.6rem);
  display:flex;flex-direction:column;gap:.4rem;
  transition:border-color .2s,transform .15s;
}
a.card{color:var(--text)}
a.card:hover{text-decoration:none;border-color:var(--gold);transform:translateY(-2px)}
.card .icon{font-size:1.6rem;line-height:1;margin-bottom:.5rem}
.card h3{margin-bottom:.2em}
.card p{color:var(--muted);font-size:.95rem;margin:0}
.card .tag{
  align-self:flex-start;font-family:var(--font-display);font-size:.72rem;font-weight:600;
  letter-spacing:.1em;text-transform:uppercase;color:var(--gold);
  border:1px solid rgba(217,178,74,.35);border-radius:999px;padding:.25rem .65rem;margin-bottom:.6rem;
}
.card .more{margin-top:auto;padding-top:.75rem;color:var(--gold-soft);font-weight:600;font-size:.92rem}

/* featured panel */
.panel{
  background:linear-gradient(140deg,var(--surface-2),var(--surface));
  border:1px solid rgba(217,178,74,.35);border-radius:var(--radius-lg);
  padding:clamp(1.5rem,4vw,2.5rem);
}

/* ===== Steps / numbered ===== */
.step-num{
  font-family:var(--font-display);font-weight:700;font-size:.9rem;color:var(--gold);
  border:1px solid rgba(217,178,74,.4);border-radius:999px;
  width:2.2rem;height:2.2rem;display:inline-flex;align-items:center;justify-content:center;margin-bottom:.75rem;
}

/* ===== Stats ===== */
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;text-align:center}
@media (min-width:720px){.stats{grid-template-columns:repeat(4,1fr)}}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.25rem 1rem}
.stat b{display:block;font-family:var(--font-display);font-size:2rem;color:var(--gold)}
.stat span{color:var(--muted);font-size:.9rem}

/* ===== Case study specifics ===== */
.cs-index{counter-reset:cs}
.cs-section{border-top:1px solid var(--line)}
.cs-label{
  font-family:var(--font-display);font-weight:700;color:var(--gold);
  font-size:.85rem;letter-spacing:.12em;text-transform:uppercase;margin-bottom:.75rem;display:block;
}
.problem-solution{display:grid;gap:1rem}
@media (min-width:760px){.problem-solution{grid-template-columns:1fr 1fr}}
.ps{border-radius:var(--radius);padding:1.1rem 1.25rem;border:1px solid var(--line);background:var(--surface)}
.ps.problem{border-left:3px solid var(--bad)}
.ps.solution{border-left:3px solid var(--ok)}
.ps b{display:block;font-family:var(--font-display);font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:.4rem}
.ps.problem b{color:var(--bad)}
.ps.solution b{color:var(--ok)}
.ps p{margin:0;color:var(--text);font-size:.95rem}

details.fix{
  border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);
  margin-bottom:.6rem;overflow:hidden;
}
details.fix summary{
  cursor:pointer;list-style:none;display:flex;align-items:center;gap:.75rem;
  padding:.9rem 1.1rem;min-height:52px;font-weight:600;font-family:var(--font-display);
}
details.fix summary::-webkit-details-marker{display:none}
details.fix summary .n{color:var(--gold);font-size:.85rem;flex:none;width:2ch}
details.fix summary::after{content:"+";margin-left:auto;color:var(--gold);font-size:1.3rem;line-height:1}
details.fix[open] summary::after{content:"–"}
details.fix .fix-body{padding:0 1.1rem 1rem;display:grid;gap:.6rem}
@media (min-width:760px){details.fix .fix-body{grid-template-columns:1fr 1fr}}

/* table */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}
table{width:100%;border-collapse:collapse;font-size:.95rem;min-width:520px}
th,td{text-align:left;padding:.8rem 1rem;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:var(--font-display);color:var(--gold);white-space:nowrap}
tr:last-child td{border-bottom:0}

/* quote */
blockquote{
  margin:2rem 0;padding:1.25rem 1.5rem;border-left:3px solid var(--gold);
  background:var(--surface);border-radius:0 var(--radius) var(--radius) 0;
  font-family:var(--font-display);font-size:1.15rem;color:var(--gold-soft);
}

/* code block */
pre{
  background:#0a0a12;border:1px solid var(--line);border-radius:var(--radius);
  padding:1.1rem 1.25rem;overflow-x:auto;font-size:.88rem;line-height:1.55;color:#cfe3cf;
}

/* pricing */
.price-card{position:relative}
.price-card .price{font-family:var(--font-display);font-size:2.2rem;font-weight:700;color:var(--gold);margin:.25rem 0 0}
.price-card .price small{font-size:1rem;color:var(--muted);font-weight:500}
.price-card ul{margin:.75rem 0 0;padding:0;list-style:none;color:var(--muted);font-size:.95rem}
.price-card ul li{padding:.35rem 0 .35rem 1.4rem;position:relative}
.price-card ul li::before{content:"✓";position:absolute;left:0;color:var(--gold)}
.badge-reco{
  position:absolute;top:-12px;right:1.25rem;background:var(--gold);color:#161204;
  font-family:var(--font-display);font-weight:700;font-size:.75rem;letter-spacing:.08em;text-transform:uppercase;
  padding:.3rem .8rem;border-radius:999px;
}

/* ===== CTA band ===== */
.cta-band{
  text-align:center;
  background:linear-gradient(160deg,rgba(217,178,74,.12),transparent 60%),var(--surface);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.cta-band .lead{margin-inline:auto}
.cta-band .btn-row{justify-content:center;margin-top:1.5rem}

/* ===== Footer ===== */
.site-footer{padding:2.5rem 0 3rem;border-top:1px solid var(--line);color:var(--muted);font-size:.92rem}
.site-footer .foot{display:flex;flex-direction:column;gap:1rem}
.site-footer nav{display:flex;flex-wrap:wrap;gap:.25rem 1.25rem}
.site-footer a{color:var(--muted);min-height:44px;display:inline-flex;align-items:center}
.site-footer a:hover{color:var(--gold-soft)}
@media (min-width:760px){
  .site-footer .foot{flex-direction:row;align-items:center;justify-content:space-between}
}

/* utility */
.center{text-align:center}
.mt-2{margin-top:2rem}
.muted{color:var(--muted)}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;clip-path:inset(50%);overflow:hidden}

/* ==========================================================================
   MOTION LAYER v1 — starfield, reveal, tilt, shimmer, marquee, progress
   ========================================================================== */
#starfield{position:fixed;inset:0;z-index:-1;pointer-events:none}
#scroll-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:60;
  background:linear-gradient(90deg,var(--gold),var(--gold-soft));
  transform:scaleX(0);transform-origin:0 50%;pointer-events:none;
}

/* reveal allo scroll */
.rv{opacity:0;transform:translateY(26px) scale(.985);transition:opacity .6s cubic-bezier(.22,.8,.36,1),transform .6s cubic-bezier(.22,.8,.36,1)}
.rv-in{opacity:1;transform:none}

/* hero entrance */
@keyframes heroIn{from{opacity:0;transform:translateY(28px)}to{opacity:1;transform:none}}
.hero-in{animation:heroIn .8s cubic-bezier(.22,.8,.36,1) both}

/* shimmer oro sui titoli */
.hero h1 .gold{
  background:linear-gradient(110deg,var(--gold) 20%,#fff3c4 38%,var(--gold) 55%);
  background-size:220% 100%;
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  animation:shimmer 5s ease-in-out infinite;
}
@keyframes shimmer{0%,100%{background-position:110% 0}50%{background-position:-10% 0}}

/* tilt + glow segui-mouse sulle card */
.tilt{position:relative;will-change:transform;transition:transform .25s ease}
.tilt::after{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:radial-gradient(420px circle at var(--gx,50%) var(--gy,50%),rgba(217,178,74,.13),transparent 45%);
  opacity:0;transition:opacity .3s;
}
.tilt:hover::after{opacity:1}

/* pulse sulla CTA primaria */
@keyframes ctaPulse{0%,100%{box-shadow:0 0 0 0 rgba(217,178,74,.45)}50%{box-shadow:0 0 0 12px rgba(217,178,74,0)}}
.cta-band .btn-primary{animation:ctaPulse 2.6s ease-in-out infinite}

/* marquee chips (solo desktop, creato da JS) */
.marquee{overflow:hidden;margin-top:1.5rem;-webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}
.marquee-track{display:flex;gap:.5rem;width:max-content;animation:marquee 28s linear infinite}
.marquee-track:hover{animation-play-state:paused}
.marquee .chips{flex:none;flex-wrap:nowrap;margin:0}
@keyframes marquee{to{transform:translateX(-50%)}}

/* header reattivo */
.site-header{transition:box-shadow .3s,background .3s}
.site-header.scrolled{box-shadow:0 8px 30px rgba(0,0,0,.45);background:rgba(8,8,13,.95)}

/* micro-interazioni */
.btn{transition:transform .18s cubic-bezier(.34,1.56,.64,1),background .2s,border-color .2s}
.btn:active{transform:scale(.96)}
details.fix{transition:border-color .25s}
details.fix[open]{border-color:rgba(217,178,74,.5)}
details.fix .fix-body{animation:heroIn .35s ease both}
.chips li{transition:color .25s,border-color .25s,transform .25s}
.chips li:hover{color:var(--gold-soft);border-color:var(--gold);transform:translateY(-2px)}
.stat{transition:transform .25s,border-color .25s}
.stat:hover{transform:translateY(-3px);border-color:rgba(217,178,74,.45)}

@media (prefers-reduced-motion:reduce){
  #starfield,#scroll-progress{display:none}
  .rv{opacity:1;transform:none}
  .hero-in{animation:none}
  .hero h1 .gold{animation:none;background:none;-webkit-text-fill-color:var(--gold)}
  .cta-band .btn-primary{animation:none}
  .marquee-track{animation:none}
}