:root {
  --primary: #6c5ce7;
  --secondary: #a29bfe;
  --background: #f1f2f6;
  --text: #2d3436;
  --accent: #00b894;
  --error: #d63031;
  --forward-flow: #00b894;
  --backward-flow: #ff7675;
  --weight-update: #fdcb6e;
  --neuron-active: #6c5ce7;
  --value-display-bg: rgba(0,0,0,0.7);
  --value-display-text: #fff;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: var(--background);
  color: var(--text);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

header {
  text-align: center;
  margin-bottom: 0;
  padding: 1.5rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}
header h1 {
  font-size: 2.8rem;
  margin-bottom: 0.6rem;
}
.subtitle {
  font-size: 1.3rem;
  opacity: 0.95;
}

.visualization-container {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.intro-section {
  display: flex;
  gap: 2rem;
  margin-bottom: 0;
}

.video-container {
  background: #fff;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
  height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  margin-top: 25px;
  flex: 1;
}
.video-placeholder {
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
}

.intro-text {
  flex: 1;
  background: white;
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}
.intro-text h3 {
  margin-top: 2rem;
}

.control-panel {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.2rem;
  background: #fff;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}
button {
  padding: 0.9rem 1.8rem;
  border: none;
  border-radius: 6px;
  font-weight: 700;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}
button:hover:not(:disabled) {
  background: var(--secondary);
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}
button:disabled {
  background: #b2bec3;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.activation-functions-box {
  background: #fff;
  border-radius: 12px;
  padding: 1.5rem 2rem;
  box-shadow: 0 6px 20px rgba(0,0,0,0.12);
  width: 100%;
  max-width: 100%;
  margin: 2rem 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: #2d3436;
  line-height: 1.5;
}

.activation-functions-box h4 {
  color: var(--primary);
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

.activation-functions-box ul {
  list-style-type: disc;
  padding-left: 1.3rem;
  margin-bottom: 1rem;
}

.activation-functions-box li {
  margin-bottom: 1rem;
  font-size: 1rem;
}

.activation-functions-box strong {
  color: #0984e3;
}

.activation-functions-box p {
  font-size: 1rem;
  margin-bottom: 1rem;
  color: #2d3436;
}

.network-container {
  background: #fff;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
  min-height: 450px;
  position: relative;
  overflow: visible;
  display: flex;
  flex-direction: row; /* Default: orizzontale */
  justify-content: center;
  align-items: center;
  gap: 50px;
}

.layer-title {
  display: none;
}

.network-view {
  position: relative;
  display:flex;
  gap: 70px; /* Spazio tra i livelli (orizzontale) */
  justify-content:center;
  align-items:center;
  flex-grow: 1;
  min-height: 200px;
  padding: 10px;
}

.neuron-detail {
  display:none;
}

.layer {
  display: flex;
  flex-direction: column; /* Default: neuroni in colonna */
  justify-content: center;
  align-items: center;
  gap: 60px; /* Spazio tra i neuroni verticalmente */
  position: relative;
  min-height: 350px;
}

.neuron {
  width: 36px; /* Dimensione fissa per i neuroni */
  height: 36px;
  min-width: 36px;
  min-height: 36px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid var(--primary);
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: 700;
  font-size: 0.7rem; /* Dimensione del font all'interno del neurone */
  color: var(--text);
  position: relative;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  user-select: none;
}

.neuron:hover {
  transform: scale(1.15);
  box-shadow: 0 6px 15px rgba(0,0,0,0.35);
  z-index: 10;
}
.neuron-active {
  background: var(--neuron-active);
  color: #fff;
  animation: pulse 1.5s infinite;
  transform: scale(1.15);
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(108, 92, 231, 0.7); }
  70% { box-shadow: 0 0 0 12px rgba(108, 92, 231, 0); }
  100% { box-shadow: 0 0 0 0 rgba(108, 92, 231, 0); }
}

.tooltip {
  position: absolute;
  background: rgba(0,0,0,0.85);
  color: #fff;
  padding: 0.6rem 0.9rem;
  border-radius: 8px;
  font-size: 0.95rem;
  pointer-events: none;
  z-index: 100;
  opacity: 0;
  transition: opacity 0.3s ease;
  max-width: 250px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.connection {
  position: absolute;
  height: 3px; /* Spessore delle connessioni */
  background-color: var(--secondary);
  opacity: 0.7;
  z-index: 1;
  transition: background-color 0.3s ease, opacity 0.3s ease, transform 0.3s ease;
}
.connection-active-forward {
  background-color: var(--forward-flow) !important;
  opacity: 1 !important;
  transform: scaleX(1.08) rotate(var(--angle, 0deg));
}
.connection-active-backward {
  background-color: var(--backward-flow) !important;
  opacity: 1 !important;
  transform: scaleX(1.08) rotate(var(--angle, 0deg));
}
.connection-weight-update {
  background-color: var(--weight-update) !important;
  opacity: 1 !important;
  transform: scaleX(1.08) rotate(var(--angle, 0deg));
}

.value-display {
  position: absolute;
  background: var(--value-display-bg);
  color: var(--value-display-text);
  padding: 4px 8px;
  border-radius: 5px;
  font-size: 0.85em;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transform: translateY(-15px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 50;
}
.value-display.show {
  opacity: 1;
  transform: translateY(-25px);
}

.mini-legend-panel {
  background: #fff;
  border-radius: 12px;
  padding: 1.2rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
  margin-left: 15px;
  min-width: 170px;
  align-self: flex-start;
  font-size: 1rem;
}
.mini-legend-panel h4 {
  font-size: 1.1rem;
  margin-bottom: 0.7rem;
  color: var(--primary);
}
.mini-legend-panel ul {
  list-style: none;
  padding: 0;
}
.mini-legend-panel li {
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
}
.mini-legend-number {
  display: inline-block;
  width: 28px;
  height: 28px;
  background: var(--secondary);
  color: #fff;
  border-radius: 50%;
  font-weight: bold;
  text-align: center;
  line-height: 28px;
  margin-right: 12px;
  font-size: 1.1em;
}

.mini-legend-dot {
  flex-shrink: 0;
  display: inline-block;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  margin-right: 8px;
  border: 1px solid var(--text);
  vertical-align: middle;
}

.explanation-panel, .example-panel, .legend-panel {
  background: #fff;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
  margin-top: 1.5rem;
}
.explanation-panel h4, .example-panel h4, .legend-panel h4 {
  font-size: 1.3rem;
  margin-bottom: 0.6rem;
  color: var(--primary);
}
.explanation-panel p, .example-panel p, .legend-panel p {
  font-size: 1.05rem;
  color: var(--text);
}

.example-panel ul {
  list-style: disc;
  margin-left: 25px;
  margin-bottom: 12px;
}
.example-panel li {
  margin-bottom: 6px;
}
.example-panel .example-step {
  margin-bottom: 12px;
  padding: 10px;
  border-radius: 6px;
  background-color: #e0e0e0;
  transition: background-color 0.3s ease;
}
.example-panel .example-step.active {
  background-color: #c0c0c0;
}
.example-panel .highlight {
  font-weight: bold;
  color: var(--primary);
}

.layer-badge {
  width: 32px;
  height: 32px;
  background: var(--secondary);
  color: #fff;
  border-radius: 50%;
  font-weight: bold;
  text-align: center;
  line-height: 32px;
  font-size: 1.2em;
  margin-bottom: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.10);
}

.legend-panel ul {
  list-style: none;
  padding: 0;
}
.legend-panel li {
  margin-bottom: 0.6rem;
  display: flex;
  align-items: center;
}
.legend-panel .legend-color-box {
  width: 22px;
  height: 22px;
  border-radius: 5px;
  margin-right: 12px;
  display: inline-block;
  vertical-align: middle;
}
.legend-panel .legend-text {
  vertical-align: middle;
}

#legend-list {
  list-style: none;
  padding-left: 0;
  margin: 0;
  max-width: 600px;
}

#legend-list li {
  display: flex;
  align-items: center;
  margin-bottom: 0.7rem;
  font-size: 1rem;
  line-height: 1.3;
}

.legend-color-box {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
  margin-right: 0.8rem;
  flex-shrink: 0;
  border: 2px solid transparent;
}

.legend-color-box.weight {
  background-color: #4A90E2;
  border-color: #357ABD;
}

.legend-color-box.bias {
  background-color: #F5A623;
  border-color: #D48806;
}

.legend-color-box.total-input {
  background-color: #50E3C2;
  border-color: #3BB89B;
}

.legend-color-box.activation {
  background-color: #9013FE;
  border-color: #6F0ECC;
}

.legend-color-box.activation-func {
  background-color: #B8E986;
  border-color: #8DC751;
}

.legend-color-box.layer-index {
  background-color: #F8E71C;
  border-color: #D6B70B;
}

.legend-color-box.y-hat {
  background-color: #D0021B;
  border-color: #A10015;
}

.legend-color-box.loss {
  background-color: #7ED321;
  border-color: #5D9E17;
}

.legend-color-box.delta {
  background-color: #BD10E0;
  border-color: #8B0BAA;
}

.legend-color-box.gradient {
  background-color: #417505;
  border-color: #2F4C03;
}

.legend-color-box.learning-rate {
  background-color: #F2994A;
  border-color: #C67100;
}

.legend-color-box.epoch {
  background-color: #4A90E2;
  border-color: #357ABD;
}

.legend-color-box.batch {
  background-color: #56CCF2;
  border-color: #2F9BD7;
}

.legend-color-box.forward-backprop {
  background: linear-gradient(135deg, #4A90E2 0%, #F2994A 100%);
  border-color: #357ABD;
}

form {
  width: 100%;
  max-width: 100%;
  margin: 0 auto 60px;
  text-align: left;
  background: #fff;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

form label {
  font-weight: 700;
  font-size: 1.2rem;
  color: #6c5ce7;
  user-select: none;
}

form input,
form textarea {
  width: 100%;
  margin: 8px 0 20px;
  padding: 10px 14px;
  border-radius: 8px;
  border: 2px solid var(--primary);
  font-size: 1.1rem;
  resize: vertical;
  font-family: 'Roboto', sans-serif;
  color: var(--text);
}

form input:focus,
form textarea:focus {
  border-color: var(--secondary);
  outline: none;
  box-shadow: 0 0 10px var(--secondary);
}

form button[type="submit"] {
  background-color: var(--primary);
  color: #fff;
  font-weight: 700;
  padding: 12px 32px;
  border-radius: 12px;
  border: none;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.3s ease;
  font-size: 1.1rem;
  user-select: none;
}

form button[type="submit"]:hover,
form button[type="submit"]:focus-visible {
  background-color: var(--secondary);
  transform: scale(1.05);
  outline: none;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin: 30px 0;
  flex-wrap: wrap;
  font-size: 1.2rem;
}

.social-links a {
  color: var(--primary);
  font-weight: 700;
  text-decoration: none;
  padding: 10px 22px;
  border: 2px solid var(--primary);
  border-radius: 40px;
  transition: all 0.3s ease;
  box-shadow: 0 0 8px var(--secondary);
  user-select: none;
}

.social-links a:hover,
.social-links a:focus-visible {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 0 16px var(--primary);
  transform: scale(1.1);
  outline: none;
}

footer {
  text-align: center;
  margin-top: 2rem;
  padding: 1rem;
  color: var(--text);
  font-size: 0.9rem;
}



@media (max-width: 1300px) {
  .video-container {
      display: none !important;
    }
  
    .intro-text {
      flex: 1 1 100% !important;
      width: 100% !important;
      padding: 1rem !important;
      box-sizing: border-box;
    }
  
    .intro-text h3 {
      font-size: 1.3rem;
    }
    .intro-text p {
      font-size: 1.1rem;
    }
  
    .intro-section {
      flex-direction: column !important;
      gap: 1rem !important;
    }

  .network-container {
    
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 1rem !important;
    position: relative;
  }

  .network-view {
    gap: 70px;
    width: 100%;
    justify-content: center;
  }

  .mini-legend-panel {
    margin-left: 0 !important;
    margin-top: 1rem !important;
    align-self: stretch !important;
    width: 100% !important;
    text-align: left;
    padding-left: 50px;
    position: relative;
  }

  .mini-legend-panel ul {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-left: 0;
  }

  .mini-legend-panel li {
    justify-content: flex-start;
    position: relative;
    padding-left: 40px;
  }

  .mini-legend-number,
  .mini-legend-dot {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    margin-right: 0;
  }
}

@media (max-width: 600px) {
  /* Telefono */

  .network-container {
    flex-direction: column !important;
    align-items: flex-start !important; /* allineo tutto a sinistra */
    gap: 1.5rem !important; /* spazio ridotto tra rete e legenda */
    position: relative;
  }

  .network-view {
    gap: 50px; /* come da default */
    width: 100%; /* occupa tutta la larghezza */
    justify-content: center;
  }

  .mini-legend-panel {
    margin-left: 0 !important;
    margin-top: 1rem !important;
    align-self: stretch !important; /* per occupare tutta la larghezza sotto */
    width: 100% !important;
    text-align: left;
    padding-left: 50px; /* spazio per i numeri/pallini */
    position: relative;
  }

  .mini-legend-panel ul {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-left: 0;
  }

  .mini-legend-panel li {
    justify-content: flex-start;
    position: relative;
    padding-left: 40px; /* spazio per pallino */
  }

  /* Numeri/pallini a sinistra allineati */

  .mini-legend-number,
  .mini-legend-dot {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    margin-right: 0;
  }
  
  /* Se i numeri e pallini sono entrambi usati, magari modifica i selettori o assicurati di usare uno solo */

  /* Puoi anche aumentare dimensione font per leggibilità su telefono */
  .mini-legend-panel {
    font-size: 1.1rem;
  }

  .layer{
    gap: 50px;
  }
  /* Mantieni la dimensione rete e gap originale per telefono */
}