/* ================== TOKENS ================== */
:root{
  --bg:#0b1430;               /* deep blue */
  --bg-grad-1:#0b1430;
  --bg-grad-2:#0c1b47;
  --fg:#e6eefc;
  --muted:#9fb1d6;
  --accent:#1f77b4;           /* brand blue */
  --accent-2:#61a8ff;
  --card:#121c3f;
  --ring:rgba(97,168,255,.35);
  --shadow:0 10px 26px rgba(0,0,0,.35);
  --shadow-strong:0 18px 42px rgba(0,0,0,.55);
}
:root[data-theme="light"]{
  --bg:#ffffff;
  --bg-grad-1:#ecf3ff;
  --bg-grad-2:#ffffff;
  --fg:#0b1430;
  --muted:#516384;
  --accent:#1f77b4;
  --accent-2:#1f77b4;
  --card:#f3f7ff;
  --ring:rgba(31,119,180,.35);
  --shadow:0 8px 22px rgba(25,46,89,.15);
  --shadow-strong:0 18px 42px rgba(25,46,89,.18);
}

/* ================== BASE ================== */
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background: radial-gradient(1200px 700px at 10% -10%, #0a2a6e 0%, transparent 60%) ,
              linear-gradient(180deg,var(--bg-grad-1),var(--bg-grad-2));
  color:var(--fg);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Arial, sans-serif;
  line-height:1.55;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
.small{font-size:.9rem;color:var(--muted)}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0,0,0,0)}
.layout{min-height:100dvh;display:grid;grid-template-rows:auto 1fr auto}
.container{max-width:1160px;margin:0 auto;padding:0 24px}

/* ================== HEADER ================== */
.site-header{position:sticky;top:0;z-index:50;transition:background .25s ease, border-color .25s ease}
.site-header.is-transparent{
  background:transparent;border-bottom:1px solid transparent;
}
.site-header.solid{
  /* Fallback per browser senza color-mix */
  background:rgba(11,20,48,.85);
  border-bottom:1px solid rgba(255,255,255,.06);
  backdrop-filter:saturate(160%) blur(6px);
}
@supports (background: color-mix(in oklab, white 10%, black 90%)){
  .site-header.solid{
    background:color-mix(in oklab, var(--bg) 85%, transparent);
  }
}
.nav{display:flex;align-items:center;justify-content:space-between;padding:12px 24px}
.brand a{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.2px;color:var(--fg)}
.logo-cube{width:18px;height:18px;display:inline-block;border-radius:4px;
  background:linear-gradient(135deg,var(--accent),#6fb6ff);
  box-shadow:0 0 20px rgba(97,168,255,.6) inset, 0 4px 10px rgba(0,0,0,.35);
}
.links a{margin-right:16px;color:var(--fg);opacity:.9}
.links a:last-child{margin-right:0}
.links a.active,.links a:hover{opacity:1}
.controls{display:flex;gap:10px;align-items:center}
select{background:var(--card);color:var(--fg);border:1px solid rgba(255,255,255,.12);padding:8px 10px;border-radius:10px}
:root[data-theme="light"] select{border-color:rgba(0,0,0,.12)}
select:focus{outline:0;box-shadow:0 0 0 4px var(--ring)}

/* ================== HERO ================== */
.hero-tech{position:relative;overflow:hidden;padding:96px 0}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:34px;align-items:center}
.eyebrow{font-size:.85rem;letter-spacing:.15em;color:var(--muted);text-transform:uppercase;margin-bottom:8px}
.hero-title{font-family:Poppins, Inter, sans-serif;font-weight:700;font-size:3rem;line-height:1.12;margin:.2rem 0 12px}
.hero-sub{max-width:56ch;color:var(--muted);font-size:1.05rem}
.cta{display:flex;gap:12px;margin-top:20px}
.button{display:inline-block;padding:12px 18px;border-radius:12px;border:1px solid transparent;font-size:.95rem}
.button-primary{background:var(--accent);color:#fff;box-shadow:var(--shadow)}
.button-primary:hover{box-shadow:var(--shadow-strong);transform:translateY(-1px)}
.button-ghost{border-color:rgba(255,255,255,.15);color:var(--fg);background:transparent}
.button-ghost:hover{transform:translateY(-1px)}

/* visual */
.hero-visual{display:flex;justify-content:center;align-items:center}
.stack{position:relative;width:min(520px,94%);aspect-ratio:1/1.05}
.plate{position:absolute;left:50%;transform:translateX(-50%);width:78%;height:26%;border-radius:18px;background:linear-gradient(180deg,#ffffff10,#00000020);backdrop-filter:blur(6px);box-shadow:0 12px 30px rgba(0,0,0,.35)}
.p1{bottom:12%}.p2{bottom:28%}.p3{bottom:44%}
.cube{position:absolute;left:50%;top:16%;transform:translate(-50%,-10%) rotateX(15deg);width:46%;height:46%;border-radius:18px;
  background:linear-gradient(145deg,#1a2a60,#0b1430);display:grid;place-items:center;
  box-shadow:0 30px 60px rgba(0,0,0,.55), inset 0 0 30px rgba(97,168,255,.25);
}
.cube span{font-family:Poppins, Inter, sans-serif;color:#dff0ff;font-weight:700;font-size:2.1rem;letter-spacing:.06em}
.rings,.orb{position:absolute;pointer-events:none;border-radius:50%}
.r1,.r2{border:1px solid rgba(97,168,255,.35)}
.r1{inset:7% 14% 44% 14%}
.r2{inset:0 5% 60% 5%}
.bg-blur{position:absolute;inset:-10% -10% -10% -10%;background:
  radial-gradient(40% 35% at 20% 10%, #1f77b430 0%, transparent 70%),
  radial-gradient(42% 30% at 85% 25%, #61a8ff33 0%, transparent 70%);}
.orb-1{width:240px;height:240px;left:-60px;bottom:-60px;background:radial-gradient(circle at 35% 35%, #61a8ff, transparent 60%);filter:blur(12px);opacity:.8}
.orb-2{width:180px;height:180px;right:-40px;top:40px;background:radial-gradient(circle at 50% 50%, #1f77b4, transparent 60%);filter:blur(10px);opacity:.7}

/* ================== SECTIONS & CARDS ================== */
.section{padding:28px 0}
.section-tiles{padding:34px 0 48px}
.grid-feats{display:grid;grid-template-columns:1fr;gap:18px}
@media (min-width:760px){.grid-feats{grid-template-columns:repeat(2,1fr)}}
.card{background:var(--card);border-radius:14px;padding:24px;box-shadow:var(--shadow)}
.card:hover{box-shadow:var(--shadow-strong);transform:translateY(-1px)}
.link-arrow{font-weight:600}
.page-title{margin:24px 0 16px;font-size:1.9rem;font-family:Poppins, Inter, sans-serif}
.video-card{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
  align-items:center;
}
.video-copy .eyebrow{margin-bottom:6px}
.video-embed{width:100%}
.embed-frame{
  position:relative;
  aspect-ratio:16/9;
  background:#000;
  border-radius:12px;
  overflow:hidden;
  box-shadow:var(--shadow);
}
.thumb-link{
  position:absolute;
  inset:0;
  display:block;
  color:inherit;
}
.thumb-link img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.thumb-link::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(0,0,0,.08),rgba(0,0,0,.35));
}
.play-badge{
  position:absolute;
  left:50%;
  top:50%;
  transform:translate(-50%,-50%);
  width:68px;
  height:68px;
  border-radius:50%;
  background:rgba(0,0,0,.65);
  border:2px solid rgba(255,255,255,.35);
  display:grid;
  place-items:center;
  box-shadow:0 8px 22px rgba(0,0,0,.35);
}
.play-badge::before{
  content:"";
  margin-left:4px;
  border-left:18px solid #fff;
  border-top:12px solid transparent;
  border-bottom:12px solid transparent;
}
@media (min-width:980px){
  .video-card{
    grid-template-columns:minmax(260px,360px) 1fr;
  }
}

/* ================== GPT LIST ================== */
.gpt-list{display:grid;gap:18px;margin:12px 0 34px}
.gpt-row{display:flex;flex-direction:column;gap:12px}
.gpt-title{margin:0}
.gpt-name{font-weight:800}
.gpt-sep{opacity:.6;margin:0 .35ch}
.gpt-tagline{opacity:.85}
.gpt-actions{margin:0}
.gpt-actions .button{margin-right:8px}
.gpt-actions .button:last-child{margin-right:0}
@media (min-width:760px){
  .gpt-row{flex-direction:row;align-items:center;justify-content:space-between}
  .gpt-meta{max-width:72%}
}

/* ================== BADGE CATEGORIE ================== */
.badges{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin:6px 0 10px;
}
.badge{
  display:inline-flex;
  align-items:center;
  padding:4px 10px;
  border-radius:999px;
  font-size:.75rem;
  font-weight:600;
  letter-spacing:.03em;
  text-transform:uppercase;
  border:1px solid rgba(255,255,255,.18);
  background:rgba(8,14,38,.9);
  color:var(--muted);
}
:root[data-theme="light"] .badge{
  background:rgba(242,246,255,.9);
  border-color:rgba(0,0,0,.06);
}

/* colori tenui coerenti per categorie */
.badge-diagrams{color:#9fd0ff;border-color:#4a9df0;}
.badge-finance{color:#9ae6b4;border-color:#3ba56a;}
.badge-legal{color:#d1b3ff;border-color:#8a5be8;}
.badge-process{color:#ffd4a3;border-color:#ff9f4a;}
.badge-education{color:#ffb6c8;border-color:#e75a8a;}
.badge-fx{color:#9cd0d3;border-color:#3d7c89;}

/* ================== FOOTER ================== */
.site-footer{border-top:1px solid rgba(255,255,255,.08);padding:22px 0;margin-top:28px}

/* ================== MOTION ================== */
@media (prefers-reduced-motion:no-preference){
  .card,.button,.links a{transition:all .25s ease}
  .fade-in{animation:fadein .5s ease both}
}
@keyframes fadein{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:22px}
  .hero-tech{padding:72px 0}
  .hero-title{font-size:2.4rem}
}

/* ANNIVERSARY EDITION — aggiungere questo blocco in coda al file, dopo le regole esistenti. */
.section-anniversary{
  padding:18px 0 4px;
}
.anniversary-banner{
  position:relative;
  padding:18px 20px;
  border-radius:14px;
  background:linear-gradient(135deg,rgba(31,119,180,.18),rgba(15,97,160,.08));
  border:1px solid rgba(97,168,255,.55);
  box-shadow:0 20px 40px rgba(0,0,0,.45);
}
.anniv-title{
  margin:0 0 6px;
  font-size:1.45rem;
  font-family:Poppins, Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.anniv-line{
  margin:2px 0;
  font-size:.95rem;
  color:var(--muted);
}

.section-anniv-note{
  margin-top:6px;
  margin-bottom:12px;
}
.anniversary-note{
  border:1px dashed rgba(97,168,255,.6);
  background:linear-gradient(135deg,rgba(15,25,60,.9),rgba(12,20,48,.96));
}
.anniv-note-title{
  margin-top:0;
  margin-bottom:6px;
  font-size:1.15rem;
  font-family:Poppins, Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.anniversary-note p.small{
  font-size:.85rem;
  opacity:.9;
}

@media (max-width:960px){
  .section-anniversary{
    padding:12px 0 0;
  }
  .anniversary-banner{
    padding:16px 16px;
  }
}

/* Evidenziazione anniversario per il primo GPT — aggiungere vicino alle altre regole dei GPT/card */
.gpt-card-anniv {
  border: 1px solid #d4af37;
  box-shadow: 0 0 0 1px rgba(212,175,55,0.35), var(--shadow-strong);
  position: relative;
}

.gpt-card-anniv::before {
  content: "★";
  position: absolute;
  top: 14px;
  right: 18px;
  font-size: 0.9rem;
  color: #d4af37; /* stesso oro più scuro */
  text-shadow: 0 0 6px rgba(0,0,0,0.45);
}

.gpt-anniv-note {
  margin: 4px 0 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: #d4af37; /* oro più scuro e contrastato */
}

/* ANNIVERSARY GLOBAL BANNER — AGGIUNGERE IN FONDO AL FILE */

.anniversary-banner-global {
  width: 100%;
  margin: 0;
  padding: 22px 0;
  background: linear-gradient(
    135deg,
    #d4af37 0%,
    #f1d27a 45%,
    #d4af37 100%
  ); /* ORO */
  color: #1a1a1a;
  text-align: center;
  border-bottom: 3px solid rgba(0,0,0,0.25);
  box-shadow: 0 8px 24px rgba(0,0,0,0.35);
  position: relative;
  z-index: 9999;
}

.anniversary-banner-global .anniv-date {
  margin: 0 0 6px;
  font-size: 0.95rem;
  font-weight: 500;
  color: #333;
}

.anniversary-banner-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 18px;
}

.anniversary-banner-global .anniv-title {
  margin: 0 0 6px;
  font-size: 1.55rem;
  font-weight: 700;
  font-family: Poppins, Inter, sans-serif;
  color: #111;
}

.anniversary-banner-global .anniv-line {
  margin: 3px 0;
  font-size: 1rem;
  font-weight: 500;
  color: #222;
}

@media (max-width: 900px){
  .anniversary-banner-global .anniv-title {
    font-size: 1.3rem;
  }
  .anniversary-banner-global .anniv-line {
    font-size: 0.92rem;
  }
}

/* === HEADER ALWAYS ON TOP (sopra il banner durante lo scroll) === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10000 !important;   /* più alto del banner */
}

/* Il banner deve stare sotto l’header quando si scrolla */
.anniversary-banner-global {
  z-index: 9990 !important;
}

.anniversary-banner-global + .site-header {
  margin-top: 0 !important;
  padding-top: 0 !important;
  top: 0 !important;     /* garantisce aderenza con sticky */
  position: sticky;      /* preserva il comportamento nativo del tuo header */
}

/* SLIM ANNIVERSARY BANNER — AGGIUNGERE IN FONDO AL FILE */

.anniversary-banner-slim {
  width: 100%;
  margin: 0;
  padding: 10px 0 9px;
  background: linear-gradient(
    135deg,
    #d4af37 0%,
    #f1d27a 45%,
    #d4af37 100%
  );
  color: #1a1a1a;
  text-align: center;
  border-bottom: 2px solid rgba(0,0,0,0.22);
  box-shadow: 0 6px 18px rgba(0,0,0,0.28);
  position: relative;
  z-index: 9998; /* sotto l’header sticky, sopra il contenuto */
}

.anniv-slim-line {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 600;
  font-family: Poppins, Inter, sans-serif;
  color: #222;
}

@media (max-width: 900px) {
  .anniv-slim-line {
    font-size: 0.85rem;
  }
}