*,*::before,*::after{box-sizing:border-box}
html{height:100%;margin:0;background:#0B0F1A}
body{height:100%;margin:0;background:transparent;overscroll-behavior:none;overflow-x:hidden}

/* Canvas sinapsi — sfondo fisso visibile dietro tutto */
#synapse-bg{position:fixed;inset:0;z-index:0;pointer-events:none;display:block;}
body{font-family:'DM Sans',sans-serif;color:#E2E8F0;-webkit-font-smoothing:antialiased}
::-webkit-scrollbar{display:none}
.safe-top{padding-top:max(16px,env(safe-area-inset-top))}
.safe-bottom{padding-bottom:max(20px,env(safe-area-inset-bottom))}

.glass{
  background:rgba(28,37,64,.55);
  border:1px solid rgba(61,123,255,.15);
}

/* Flip card — rotateY con fronte in-flow */
.flip-scene{
  width:100%;cursor:pointer;
  perspective:1000px;
}
.flip-inner{
  position:relative;width:100%;
  transform-style:preserve-3d;
  transition:transform 0.8s cubic-bezier(0.175,0.885,0.32,1.275);
}
.flip-inner.flipped{transform:rotateY(180deg)}
/* Fronte: IN FLOW — dà altezza reale al wrapper */
.flip-face{
  width:100%;min-height:220px;
  backface-visibility:hidden;-webkit-backface-visibility:hidden;
  border-radius:20px;display:flex;flex-direction:column;align-items:center;
  justify-content:center;padding:24px 20px;text-align:center;overflow:hidden;
}
/* Retro: ASSOLUTO sopra il fronte, stessa posizione */
.flip-back{
  position: absolute !important; 
  top: 0; left: 0; width: 100%; min-height: 100%;
  transform:rotateY(180deg);
  backface-visibility:hidden;-webkit-backface-visibility:hidden;
  border-radius:20px;display:flex;flex-direction:column;align-items:center;
  justify-content:center;padding:24px 20px;text-align:center;
}

/* Option buttons */
.opt-btn{transition:all .18s ease;border:1.5px solid rgba(61,123,255,.25)}
.opt-btn:active{transform:scale(.97)}
.opt-btn.correct{border-color:#22C55E;background:rgba(34,197,94,.12)}
.opt-btn.wrong{border-color:#EF4444;background:rgba(239,68,68,.12)}
.opt-btn.shown{opacity:.55;cursor:default}
.progress-fill{transition:width .4s cubic-bezier(.22,1,.36,1)}

/* Filter chip */
.chip{
  display:inline-flex;align-items:center;padding:5px 12px;border-radius:999px;
  font-size:.75rem;font-family:'Sora',sans-serif;font-weight:600;
  border:1.5px solid rgba(61,123,255,.2);background:rgba(11,15,26,.5);
  cursor:pointer;transition:all .15s ease;white-space:nowrap;
}
.chip.active{background:rgba(61,123,255,.25);border-color:#3D7BFF;color:#fff;}
.chip:active{transform:scale(.96)}
.chip.disabled{opacity:.35;cursor:not-allowed;pointer-events:none}

/* Notification card */
.notif-exam-critical{border-color:rgba(239,68,68,.4);background:rgba(239,68,68,.06)}
.notif-exam-high    {border-color:rgba(245,158,11,.4);background:rgba(245,158,11,.06)}
.notif-exam-normal  {border-color:rgba(61,123,255,.3);background:rgba(61,123,255,.06)}
.notif-info         {border-color:rgba(96,165,250,.3);background:rgba(96,165,250,.06)}

/* Skeleton */
.shimmer{background:linear-gradient(90deg,#131929 25%,#1C2540 50%,#131929 75%);background-size:200% 100%;animation:shimmer 1.4s infinite}
@keyframes shimmer{to{background-position:-200% 0}}

/* Blobs */
.blob{position:fixed;border-radius:50%;filter:blur(90px);pointer-events:none;z-index:0;opacity:.18}

/* Stat bar */
.stat-bar{transition:width .6s cubic-bezier(.22,1,.36,1)}

@keyframes swipeHint{0%,100%{transform:translateX(0);opacity:.7}40%{transform:translateX(-10px);opacity:1}}
.swipe-hint{animation:swipeHint 2s ease-in-out infinite}

/* Badge notifiche */
.notif-badge{
  position:absolute;top:-4px;right:-4px;width:16px;height:16px;
  background:#EF4444;border-radius:50%;display:flex;align-items:center;
  justify-content:center;font-size:9px;font-weight:800;color:#fff;
  border:2px solid #0B0F1A;
}

/* ── Bottom Nav — pill stile Uiverse ─────────────────────────────────── */
.bottom-nav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 50;
  display: flex; justify-content: center; align-items: flex-end;
  padding-bottom: calc(env(safe-area-inset-bottom) + 14px);
  pointer-events: none;
}

.bnav-pill {
  display: flex; align-items: center; justify-content: space-evenly;
  background: #1B5FDB;
  width: 270px;
  height: 62px;
  border-radius: 31px;
  box-shadow: rgba(0,0,0,.4) 0px 6px 20px, rgba(27,95,219,.55) 4px 10px 20px;
  pointer-events: all;
  padding: 0 10px;
  gap: 0;
}

.bnav-item {
  outline: none; border: none;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: transparent;
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,.55);
  cursor: pointer; position: relative;
  transition: all .25s cubic-bezier(.22,1,.36,1);
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}

.bnav-item:active {
  transform: scale(.9);
}

.bnav-item.active {
  color: #fff;
  background: radial-gradient(circle, rgba(255,255,255,0.12) 15%, transparent 65%);
  box-shadow: none;
}

.bnav-item.active svg {
  filter: drop-shadow(0 0 6px rgba(255,255,255,0.4));
  transform: translateY(0);
}

.bnav-item svg {
  width: 22px; height: 22px; transition: inherit;
}

/* Extra bottom padding per schermate con bottom nav */
.has-bnav{padding-bottom:calc(82px + env(safe-area-inset-bottom))!important}

/* ── Splash intro ────────────────────────────────────────────────────── */
.splash-overlay{
  position:fixed;inset:0;z-index:100;
  background:#0B0F1A;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  pointer-events:none;
}
.splash-overlay.done{display:none!important}

#splash-content{
  display:flex;flex-direction:column;align-items:center;text-align:center;
  padding:0 36px;
  will-change:transform,opacity;
  transition:transform .7s cubic-bezier(.4,0,.2,1), opacity .4s ease;
}
#splash-content.rising{
  transform:translateY(-38vh) scale(.52);
  opacity:0;
}

#splash-greeting{
  font-family:'Sora',sans-serif;font-weight:600;
  font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;
  color:#64748B;margin:0 0 10px;
  opacity:0;transform:translateY(14px);
  transition:opacity .45s ease, transform .45s cubic-bezier(.22,1,.36,1), color .5s ease;
}
#splash-greeting.in{opacity:1;transform:translateY(0)}
#splash-greeting.dimmed{color:#374151}

#splash-question{
  font-family:'Sora',sans-serif;font-weight:800;
  font-size:2.15rem;line-height:1.15;color:#fff;margin:0;
  opacity:0;transform:translateY(16px);
  transition:opacity .5s ease, transform .5s cubic-bezier(.22,1,.36,1);
}
#splash-question.in{opacity:1;transform:translateY(0)}

#splash-accent{
  width:40px;height:4px;border-radius:999px;background:#3D7BFF;
  margin-top:16px;
  opacity:0;transform:scaleX(0);transform-origin:center;
  transition:opacity .4s ease .05s, transform .45s cubic-bezier(.22,1,.36,1) .05s;
}
#splash-accent.in{opacity:1;transform:scaleX(1)}

/* ── Streak / XP bar ─────────────────────────────────────────────────── */
.xp-bar-track{height:6px;border-radius:999px;background:#1C2540;overflow:hidden}
.xp-bar-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,#3D7BFF,#60A5FA);
  transition:width .6s cubic-bezier(.22,1,.36,1)}
@keyframes flamePulse{0%,100%{transform:scale(1)}50%{transform:scale(1.2) rotate(-6deg)}}
.flame-icon{display:inline-block;animation:flamePulse 1.8s ease-in-out infinite}

/* ── Shake (risposta sbagliata) ──────────────────────────────────────── */
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-7px)}40%{transform:translateX(7px)}60%{transform:translateX(-5px)}80%{transform:translateX(5px)}}
.shake{animation:shake .38s ease both}

/* ── Particle burst (risposta corretta) ──────────────────────────────── */
.particle-host{position:relative;overflow:visible}
.burst-particle{
  position:absolute;top:50%;left:50%;width:8px;height:8px;border-radius:50%;
  pointer-events:none;z-index:99;
  animation:burst .55s cubic-bezier(.22,1,.36,1) both;
}
@keyframes burst{
  0%{transform:translate(-50%,-50%) scale(0);opacity:1}
  100%{transform:translate(var(--bx),var(--by)) scale(0);opacity:0}
}

/* ── Confetti ────────────────────────────────────────────────────────── */
#confetti-canvas{position:fixed;inset:0;pointer-events:none;z-index:200}

/* ── Heatmap ─────────────────────────────────────────────────────────── */
.heatmap-grid{display:grid;grid-template-columns:repeat(17,1fr);gap:3px}
.heatmap-cell{
  aspect-ratio:1;border-radius:3px;background:#1C2540;
  transition:all .15s ease;cursor:default;
}
.heatmap-cell[data-lvl="1"]{background:rgba(61,123,255,.3)}
.heatmap-cell[data-lvl="2"]{background:rgba(61,123,255,.55)}
.heatmap-cell[data-lvl="3"]{background:rgba(61,123,255,.8)}
.heatmap-cell[data-lvl="4"]{background:#3D7BFF}

/* ── Swipe flashcard ─────────────────────────────────────────────────── */
.fc-swipe-container{position:relative;overflow:visible;touch-action:pan-y}
.fc-swipe-hint-overlay{
  position:absolute;inset:0;border-radius:20px;
  display:flex;align-items:center;justify-content:center;
  font-size:2rem;font-weight:900;pointer-events:none;opacity:0;
  transition:opacity .1s ease;z-index:10;
}
.fc-swipe-hint-overlay.right{background:rgba(34,197,94,.25);color:#22C55E}
.fc-swipe-hint-overlay.left {background:rgba(239,68,68,.25);color:#EF4444}

/* ── Result ring animated ────────────────────────────────────────────── */
.ring-animated{transition:stroke-dasharray 1.2s cubic-bezier(.22,1,.36,1)}

/* ── Aurora blob perimetrale ─────────────────────────────────────────── */
.aurora-card{position:relative;overflow:hidden}
.aurora-card::before{
  content:'';position:absolute;
  width:70%;height:70%;border-radius:50%;
  filter:blur(38px);z-index:0;opacity:.5;pointer-events:none;
  top:0;left:0;transform:translate(-45%,-45%);
  animation:aurora-perimeter 18s infinite linear;
}
.aurora-accent::before{background:radial-gradient(circle,rgba(61,123,255,.95),rgba(96,165,250,.5),transparent 70%)}
.aurora-amber::before {background:radial-gradient(circle,rgba(245,158,11,.9),rgba(251,191,36,.45),transparent 70%)}
.aurora-ok::before    {background:radial-gradient(circle,rgba(34,197,94,.9),rgba(74,222,128,.45),transparent 70%)}
.aurora-back::before{
  content:'';position:absolute;
  width:70%;height:70%;border-radius:50%;
  background:radial-gradient(circle,rgba(96,165,250,.9),rgba(147,197,253,.45),transparent 70%);
  filter:blur(38px);z-index:0;opacity:.5;pointer-events:none;
  top:0;left:0;transform:translate(-45%,-45%);
  animation:aurora-perimeter 18s infinite linear;
}
.aurora-back > *,.aurora-card > *{position:relative;z-index:1}
@keyframes aurora-perimeter{
  0%  {top:0%;   left:0%;   transform:translate(-45%,-45%) scale(1)  }
  24% {top:0%;   left:100%; transform:translate(-55%,-45%) scale(1.1)}
  25% {top:0%;   left:100%; transform:translate(-55%,-45%) scale(1.1)}
  49% {top:100%; left:100%; transform:translate(-55%,-55%) scale(1)  }
  50% {top:100%; left:100%; transform:translate(-55%,-55%) scale(1)  }
  74% {top:100%; left:0%;   transform:translate(-45%,-55%) scale(1.1)}
  75% {top:100%; left:0%;   transform:translate(-45%,-55%) scale(1.1)}
  99% {top:0%;   left:0%;   transform:translate(-45%,-45%) scale(1)  }
  100%{top:0%;   left:0%;   transform:translate(-45%,-45%) scale(1)  }
}
.btn-glowing {
  position: relative;
  overflow: hidden;
  z-index: 1;
}

.btn-glowing::before {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 250%; height: 250%;
  background: conic-gradient(from 0deg, transparent 70%, #3D7BFF 80%, #60A5FA 100%);
  animation: spin-glow 2.5s linear infinite;
  transform: translate(-50%, -50%);
  z-index: -2;
}

.btn-glowing::after {
  content: '';
  position: absolute;
  inset: 1.5px;
  background: #1C2540;
  border-radius: inherit;
  z-index: -1;
}

@keyframes spin-glow {
  0% { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}
.reveal-card {
  position: relative;
  width: 100%;
  min-height: 220px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  perspective: 1000px;
  transition: all 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  cursor: pointer;
  border: 1px solid rgba(61,123,255,.15);
}

.reveal-card__front {
  transition: all 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 20px;
}

.reveal-card.is-open {
  transform: scale(1.02);
  box-shadow: 0 8px 24px rgba(61, 123, 255, 0.15);
}

.reveal-card.is-open .reveal-card__front {
  transform: scale(0);
  opacity: 0;
}

.reveal-card__content {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: 24px 20px;
  box-sizing: border-box;
  text-align: center;
  transform: rotateX(-90deg);
  transform-origin: bottom;
  transition: all 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.reveal-card.is-open .reveal-card__content {
  transform: rotateX(0deg);
}
.podcast-play-btn {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 64px; height: 64px;
  background-color: #3D7BFF;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.podcast-play-btn input { display: none; }

.podcast-play-btn svg {
  position: absolute;
  width: 24px; height: 24px;
  fill: white;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.podcast-play-btn .pause { opacity: 0; transform: scale(0) rotate(-45deg); }
.podcast-play-btn .play { opacity: 1; transform: scale(1) translateX(2px); }

.podcast-play-btn input:checked ~ .pause { opacity: 1; transform: scale(1) rotate(0deg); }
.podcast-play-btn input:checked ~ .play { opacity: 0; transform: scale(0) rotate(45deg); }

.podcast-play-btn:active { transform: scale(0.9); }
.no-scrollbar { scrollbar-width: none; }
.no-scrollbar::-webkit-scrollbar { display: none; }

/* ==========================================================================
   1. LOADER GEOMETRICO - GIGANTE E CON COLORI ACCOPPIATI
   ========================================================================== */
.synap-geometric-loader {
  position: relative;
  /* Questo rende il loader GIGANTE. Aumenta o diminuisci a piacimento */
  font-size: 60px; 
  width: 2.5em;
  height: 2.5em;
  transform: rotate(165deg);
  margin-bottom: 2rem;
}

.synap-geometric-loader:before, 
.synap-geometric-loader:after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  display: block;
  width: 0.5em;
  height: 0.5em;
  border-radius: 0.25em;
  transform: translate(-50%, -50%);
}

.synap-geometric-loader:before { animation: synapBefore8 2s infinite; }
.synap-geometric-loader:after { animation: synapAfter6 2s infinite; }

/* ASSE 1 (Azzurro vivido ma profondo) */
@keyframes synapBefore8 {
  0% {
    width: 0.5em;
    box-shadow: 1em -0.5em rgba(68, 119, 206, 0.95), -1em 0.5em rgba(68, 119, 206, 0.95);
  }
  35% {
    width: 2.5em;
    box-shadow: 0 -0.5em rgba(68, 119, 206, 0.95), 0 0.5em rgba(68, 119, 206, 0.95);
  }
  70% {
    width: 0.5em;
    box-shadow: -1em -0.5em rgba(68, 119, 206, 0.95), 1em 0.5em rgba(68, 119, 206, 0.95);
  }
  100% {
    box-shadow: 1em -0.5em rgba(68, 119, 206, 0.95), -1em 0.5em rgba(68, 119, 206, 0.95);
  }
}

/* ASSE 2 (Viola ametista) */
@keyframes synapAfter6 {
  0% {
    height: 0.5em;
    box-shadow: 0.5em 1em rgba(147, 84, 212, 0.95), -0.5em -1em rgba(147, 84, 212, 0.95);
  }
  35% {
    height: 2.5em;
    box-shadow: 0.5em 0 rgba(147, 84, 212, 0.95), -0.5em 0 rgba(147, 84, 212, 0.95);
  }
  70% {
    height: 0.5em;
    box-shadow: 0.5em -1em rgba(147, 84, 212, 0.95), -0.5em 1em rgba(147, 84, 212, 0.95);
  }
  100% {
    box-shadow: 0.5em 1em rgba(147, 84, 212, 0.95), -0.5em -1em rgba(147, 84, 212, 0.95);
  }
}

/* ==========================================================================
   2. SCRITTA "SYNAP" (Effetto Shimmer Premium)
   ========================================================================== */
.synap-premium-text {
  /* Usiamo i tuoi colori base per non stonare */
  background: linear-gradient(
    to right,
    #1c2541 20%, /* Il blu scuro delle tue caselle */
    #8BAAE2 50%, /* La luce della "scansione" (un azzurro carta da zucchero) */
    #1c2541 80%
  );
  background-size: 200% auto;
  
  /* Mascheriamo il gradiente a forma di testo */
  color: transparent;
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  
  /* L'animazione fluida */
  animation: synapShimmer 2.5s linear infinite;
  
  /* Tipografia: Molto spaziata e massiccia */
  font-weight: 900;
  letter-spacing: 0.4em;
}

@keyframes synapShimmer {
  to { background-position: 200% center; }
}