:root {
  color-scheme: light;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: #f5f6fa;
  color: #1f2933;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.network-wrapper {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 1.8rem;
  padding: 1.35rem 1.8rem 2.25rem;
  position: relative;
  flex-wrap: wrap;
}

.network-sidebar {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  max-width: 288px;
  width: min(288px, 100%);
}

.network-header {
  padding: 0;
}

.network-header h1 {
  margin: 0 0 0.54rem;
  font-size: 1.71rem;
}

.network-header p {
  margin: 0;
  color: #52606d;
}

#network {
  position: relative;
  width: clamp(684px, 81vw, 990px);
  height: clamp(486px, 67.5vh, 684px);
  background: #fff;
  border-radius: 1.35rem;
  box-shadow: 0 18px 54px rgba(15, 23, 42, 0.12);
  padding: 2.25rem 2.7rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}

.pet-preview {
  width: 100%;
  background: rgba(255, 255, 255, 0.7);
  border-radius: 0.9rem;
  padding: 0.585rem;
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.18);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  border: 1px solid rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(4px);
}

.pet-preview a {
  display: block;
  border-radius: 0.85rem;
  overflow: hidden;
}

.pet-preview img {
  width: 100%;
  height: 187px;
  object-fit: contain;
  border-radius: 0.765rem;
  display: block;
  box-shadow: inset 0 1px 5px rgba(15, 23, 42, 0.15);
  background: rgba(15, 23, 42, 0.08);
}

.pet-preview-label {
  text-transform: uppercase;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-align: center;
  color: #1f2937;
  font-weight: 700;
}

.input-arrow {
  position: absolute;
  top: 50%;
  left: 45px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  font-size: 3.15rem;
  color: rgba(37, 99, 235, 0.8);
  text-shadow: 0 9px 22px rgba(15, 23, 42, 0.12);
}

.network-status {
  position: absolute;
  bottom: 0.6rem;
  left: 50%;
  transform: translate(-50%, 10px);
  font-size: 1.56rem;
  color: #1f2937;
  background: rgba(255, 255, 255, 0.9);
  padding: 0.7rem 1.8rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.4);
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.12);
  pointer-events: none;
  opacity: 0;
  display: none;
}

.network-status--visible {
  display: inline-flex;
  opacity: 1;
  transform: translate(-50%, 0);
}

@keyframes statusFlash {
  0% {
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.12), 0 0 0 rgba(59, 130, 246, 0);
  }
  50% {
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.12), 0 0 18px rgba(59, 130, 246, 0.35);
  }
  100% {
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.12), 0 0 0 rgba(59, 130, 246, 0);
  }
}

.network-status--flash {
  animation: statusFlash 0.8s ease;
}

@keyframes statusDissolve {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

.network-status--dissolve {
  animation: statusDissolve 1s forwards;
}

.layers {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  height: 100%;
  position: relative;
  z-index: 2;
  pointer-events: none;
}

.layer {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1.44rem;
  position: relative;
  pointer-events: none;
}

.layer-label {
  position: absolute;
  top: 0.36rem;
  font-size: 0.738rem;
  color: #829ab1;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.54rem;
  flex-wrap: wrap;
}

.layer-action {
  pointer-events: auto;
  border: none;
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  background: #2563eb;
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.35);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.layer-action:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.45);
}

.layer-action:active {
  transform: translateY(0);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.neuron-controls {
  display: none;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 0.2rem;
  pointer-events: auto;
}

.neuron-controls--visible,
.neuron-controls--persistent {
  display: flex;
}

.neuron-controls button {
  width: 31px;
  height: 31px;
  border-radius: 50%;
  border: 1px solid #d2d6dc;
  background: #e4ecf7;
  color: #1d3557;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}

.neuron-controls button:hover {
  background: #cbd5f5;
  transform: translateY(-1px);
}

.neuron-controls button:active {
  transform: translateY(0);
}

.neuron-controls button:focus-visible {
  outline: 2px solid #2563eb;
  outline-offset: 2px;
}

.neuron-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  pointer-events: auto;
  position: relative;
}

.neuron-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #52606d;
  pointer-events: none;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.neuron-block:hover .neuron-label,
.neuron-block:focus-within .neuron-label {
  opacity: 1;
  transform: translateY(0);
}

.neuron {
  width: 83px;
  height: 83px;
  border-radius: 50%;
  border: 2.7px solid #d9e2ec;
  background: linear-gradient(145deg, #f8fafc, #e4ecf4);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 3.6px 9px rgba(148, 163, 184, 0.3);
  font-size: 0.945rem;
  font-weight: 600;
  color: #102a43;
  pointer-events: none;
  position: relative;
  z-index: 3;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, border-color 0.2s ease;
  will-change: transform;
}

.neuron--type-input {
  background: linear-gradient(145deg, #ffe8cc, #ffd6a1);
  border-color: #f5c48d;
}

.neuron--type-hidden {
  background: linear-gradient(145deg, #e0edff, #c7dcff);
  border-color: #a1c0fb;
}

.neuron--type-output {
  background: linear-gradient(145deg, #ffd7d7, #ffb4b4);
  border-color: #f09a9a;
}

.neuron-prediction-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #1f2937;
  padding: 0.2rem 0.45rem;
  border-radius: 0.55rem;
  margin-top: 0.35rem;
  background: rgba(15, 23, 42, 0.06);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.neuron-prediction-icon {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-left: 0.54rem;
  position: absolute;
  top: 45%;
  right: 18px;
  transform: translate(0, -50%);
  box-shadow: 0 9px 22px rgba(15, 23, 42, 0.18);
  pointer-events: none;
}

.neuron-prediction-icon--success {
  background: rgba(34, 197, 94, 0.25);
  color: #14532d;
}

.neuron-prediction-icon--error {
  background: rgba(239, 68, 68, 0.25);
  color: #7f1d1d;
}

.neuron--clickable {
  pointer-events: auto;
  cursor: pointer;
}

@keyframes neuronPulseOrange {
  0% {
    background: linear-gradient(145deg, #ffe8cc, #ffd6a1);
    border-color: #f5c48d;
  }
  40% {
    background: linear-gradient(145deg, #ffcf99, #ffb866);
    border-color: #fb923c;
    box-shadow: inset 0 6px 16px rgba(248, 191, 97, 0.7), 0 10px 26px rgba(253, 186, 116, 0.35);
  }
  100% {
    background: linear-gradient(145deg, #ffe8cc, #ffd6a1);
    border-color: #f5c48d;
  }
}

@keyframes neuronPulseBlue {
  0% {
    background: linear-gradient(145deg, #e0edff, #c7dcff);
    border-color: #a1c0fb;
  }
  40% {
    background: linear-gradient(145deg, #c0d8ff, #97beff);
    border-color: #2563eb;
    box-shadow: inset 0 6px 16px rgba(59, 130, 246, 0.45), 0 10px 26px rgba(96, 165, 250, 0.35);
  }
  100% {
    background: linear-gradient(145deg, #e0edff, #c7dcff);
    border-color: #a1c0fb;
  }
}

@keyframes neuronPulseRed {
  0% {
    background: linear-gradient(145deg, #ffd7d7, #ffb4b4);
    border-color: #f09a9a;
  }
  40% {
    background: linear-gradient(145deg, #ffb7b7, #ff8d8d);
    border-color: #ef4444;
    box-shadow: inset 0 6px 16px rgba(248, 113, 113, 0.55), 0 10px 26px rgba(248, 113, 113, 0.4);
  }
  100% {
    background: linear-gradient(145deg, #ffd7d7, #ffb4b4);
    border-color: #f09a9a;
  }
}

.neuron--pulse-orange {
  animation: neuronPulseOrange 0.2s ease forwards;
}

.neuron--pulse-blue {
  animation: neuronPulseBlue 0.2s ease forwards;
}

.neuron--pulse-red {
  animation: neuronPulseRed 0.2s ease forwards;
}

.neuron--clickable:hover {
  transform: scale(1.08);
  box-shadow: inset 0 6px 14px rgba(148, 163, 184, 0.38), 0 14px 26px rgba(15, 23, 42, 0.22);
}

svg#connections {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: auto;
  overflow: visible;
  z-index: 1;
}

svg#connections line {
  stroke-width: 4.3;
  stroke-linecap: round;
  opacity: 0.9;
  pointer-events: visibleStroke;
  cursor: pointer;
  transition: stroke-width 0.18s ease, opacity 0.18s ease;
}

svg#connections line.connection-line--dimmed {
  opacity: 0.14;
}

svg#connections line.connection-overlay-line {
  stroke: rgba(59, 130, 246, 0.95);
  stroke-width: 2.2;
  stroke-dasharray: 6 4;
  pointer-events: none;
}

.connection-handle {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1.35px solid rgba(37, 99, 235, 0.6);
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 5px 13px rgba(37, 99, 235, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #1e3a8a;
  font-size: 0.54rem;
  font-weight: 700;
  cursor: pointer;
  z-index: 3;
  pointer-events: auto;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease,
    opacity 0.18s ease;
}

.connection-handle--dimmed {
  opacity: 0.15;
}


#weight-panel {
  position: absolute;
  top: 0;
  left: 0;
  display: none;
  flex-direction: column;
  gap: 0.6rem;
  padding: 0.75rem 0.9rem;
  border-radius: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 18px 42px rgba(15, 23, 42, 0.16), inset 0 1px 1px rgba(255, 255, 255, 0.28);
  z-index: 4;
  min-width: 160px;
  backdrop-filter: blur(2px);
}

#neuron-panel {
  position: absolute;
  top: 0;
  left: 0;
  display: none;
  flex-direction: column;
  gap: 0.7rem;
  padding: 0.9rem 1.05rem;
  border-radius: 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.1);
  box-shadow: 0 25px 60px rgba(15, 23, 42, 0.2), inset 0 1px 1px rgba(255, 255, 255, 0.35);
  z-index: 4;
  min-width: 240px;
  max-width: 320px;
  backdrop-filter: blur(8px);
}

.neuron-expression {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: #243b53;
}

.neuron-expression-list {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.neuron-expression-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.25rem 0.4rem;
  border-radius: 0.5rem;
  background: rgba(226, 232, 240, 0.45);
  border-left: 3px solid transparent;
  transition: background 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.neuron-expression-line span {
  font-family: "SFMono-Regular", "Fira Code", "Roboto Mono", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.01em;
  color: #0b2541;
}

.neuron-expression-line:hover,
.neuron-expression-line--active {
  background: rgba(251, 146, 60, 0.24);
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.18);
  transform: translateX(4px);
  border-left: 3px solid #fb923c;
}

.neuron-expression-summary {
  margin-top: 0.4rem;
  padding-top: 0.4rem;
  border-top: 1px solid rgba(148, 163, 184, 0.45);
  font-size: 0.8rem;
  font-weight: 600;
  color: #102a43;
}

.neuron-expression-summary strong {
  font-weight: 700;
}

.neuron-expression-note {
  font-size: 0.8rem;
  color: #52606d;
}

#weight-panel button {
  border: none;
  background: none;
  cursor: pointer;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: #486581;
  cursor: move;
}

.panel-close {
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 0.4rem;
  background: #e4ecf4;
  color: #102a43;
  font-weight: 700;
  transition: background 0.24s ease;
}

.panel-close:hover {
  background: #cbd2d9;
}

.panel-body {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.9rem;
}

.neuron-panel-body {
  justify-content: flex-start;
}

.panel-value {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.panel-value-label {
  font-size: 0.72rem;
  color: #829ab1;
}

.weight-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: #102a43;
}

.panel-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.45rem;
  margin-top: 0.35rem;
}

#weight-panel .panel-controls button {
  border: 1px solid #0b2541;
  border-radius: 0.65rem;
  background: linear-gradient(135deg, #1a3359, #244679);
  color: #fdfdff;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.5rem 0.4rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.22);
  transition: transform 0.12s ease, box-shadow 0.15s ease, background 0.2s ease, color 0.2s ease;
}

#weight-panel .panel-controls button:hover {
  background: linear-gradient(135deg, #20365a, #1a2e4b);
  box-shadow: 0 10px 22px rgba(15, 23, 42, 0.28);
  color: #ffffff;
}

#weight-panel .panel-controls button:active {
  transform: translateY(1px) scale(0.97);
  box-shadow: 0 3px 8px rgba(15, 23, 42, 0.28);
}

#weight-panel .panel-controls button:focus-visible {
  outline: 2px solid rgba(59, 130, 246, 0.7);
  outline-offset: 2px;
}

footer {
  padding: 0.72rem 1.8rem 1.44rem;
  color: #829ab1;
  font-size: 0.738rem;
  text-align: center;
}

@media (max-width: 864px) {
  #network {
    padding: 1.8rem 1.44rem;
  }

  .neuron {
    width: 72px;
    height: 72px;
  }

  #weight-panel {
    min-width: 126px;
  }
}

/* Fake cursor for auto-correct animation */
.fake-cursor {
  position: absolute;
  width: 24px;
  height: 24px;
  pointer-events: none;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s ease;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.fake-cursor--visible {
  opacity: 1;
}

.fake-cursor svg {
  width: 100%;
  height: 100%;
}

@keyframes cursorClick {
  0% { transform: scale(1); }
  50% { transform: scale(0.85); }
  100% { transform: scale(1); }
}

.fake-cursor--clicking {
  animation: cursorClick 0.2s ease;
}

/* Button animation state */
.layer-action--animating,
.layer-action--disabled {
  background: #94a3b8;
  cursor: not-allowed;
  pointer-events: none;
  opacity: 0.7;
}

.layer-action--animating {
  opacity: 1;
}

.layer-action--animating::after {
  content: '';
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-left: 8px;
  border: 2px solid transparent;
  border-top-color: #fff;
  border-radius: 50%;
  animation: buttonSpin 0.8s linear infinite;
}

@keyframes buttonSpin {
  to { transform: rotate(360deg); }
}

/* Neuron highlight during auto-correct */
@keyframes neuronAutoCorrectHighlight {
  0% {
    box-shadow: inset 0 4px 10px rgba(148, 163, 184, 0.3), 0 0 0 rgba(34, 197, 94, 0);
  }
  50% {
    box-shadow: inset 0 4px 10px rgba(148, 163, 184, 0.3), 0 0 20px rgba(34, 197, 94, 0.6);
  }
  100% {
    box-shadow: inset 0 4px 10px rgba(148, 163, 184, 0.3), 0 0 0 rgba(34, 197, 94, 0);
  }
}

.neuron--auto-correct-highlight {
  animation: neuronAutoCorrectHighlight 0.6s ease;
}