:root {
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-highlight: rgba(255, 255, 255, 0.2);
  --neon-accent: #667eea;
  --text-main: rgba(255, 255, 255, 0.9);
  --text-muted: rgba(255, 255, 255, 0.6);
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  user-select: none;
  -webkit-user-select: none;
}

body {
  overflow: hidden;
  background: #050508;
  font-family: "Outfit", sans-serif;
  color: var(--text-main);
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  position: absolute;
  top: 0;
  left: 0;
}

#neural-network-canvas {
  z-index: 1;
}

.glass-panel {
  backdrop-filter: blur(24px) saturate(120%);
  -webkit-backdrop-filter: blur(24px) saturate(120%);
  background: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.05) 0%,
    rgba(255, 255, 255, 0.01) 100%
  );
  border: 1px solid var(--glass-border);
  border-top: 1px solid var(--glass-highlight);
  border-left: 1px solid var(--glass-highlight);
  box-shadow:
    0 20px 40px rgba(0, 0, 0, 0.4),
    inset 0 0 20px rgba(255, 255, 255, 0.02);
  border-radius: 24px;
  color: var(--text-main);
  transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  position: absolute;
  z-index: 10;
  overflow: hidden;
}

.glass-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.05),
    transparent
  );
  transform: skewX(-15deg);
  transition: 0.5s;
  pointer-events: none;
}

.glass-panel:hover {
  background: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.08) 0%,
    rgba(255, 255, 255, 0.02) 100%
  );
  box-shadow:
    0 30px 60px rgba(0, 0, 0, 0.5),
    inset 0 0 20px rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.15);
}

.glass-panel:hover::before {
  left: 150%;
  transition: 0.7s ease-in-out;
}

#instructions-container {
  top: 32px;
  left: 32px;
  width: 280px;
  padding: 24px;
}

#instruction-title {
  font-weight: 500;
  font-size: 18px;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 30%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.instruction-text {
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-muted);
  font-weight: 300;
}

#theme-selector {
  top: 32px;
  right: 32px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 220px;
}

#theme-selector-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 4px;
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  justify-items: center;
}

.theme-button {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  position: relative;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow:
    0 4px 10px rgba(0, 0, 0, 0.3),
    inset 0 2px 4px rgba(255, 255, 255, 0.4),
    inset 0 -2px 4px rgba(0, 0, 0, 0.2);
}

#theme-1 {
  background: radial-gradient(circle at 30% 30%, #a78bfa, #4c1d95);
}

#theme-2 {
  background: radial-gradient(circle at 30% 30%, #fb7185, #9f1239);
}

#theme-3 {
  background: radial-gradient(circle at 30% 30%, #38bdf8, #0c4a6e);
}

.theme-button::after {
  content: "";
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.8);
  opacity: 0;
  transform: scale(1.1);
  transition: all 0.3s ease;
}

.theme-button:hover {
  transform: scale(1.15) translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4), inset 0 2px 6px rgba(255, 255, 255, 0.6);
}

.theme-button.active::after {
  opacity: 1;
  transform: scale(1);
  border-color: rgba(255, 255, 255, 0.9);
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
}

#density-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
}

.density-label {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 300;
}

#density-value {
  color: white;
  font-weight: 500;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.density-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  outline: none;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.3);
}

.density-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  box-shadow:
    0 0 15px rgba(255, 255, 255, 0.8),
    0 2px 5px rgba(0, 0, 0, 0.3);
  transition: all 0.2s ease;
  margin-top: -6px;
  position: relative;
  z-index: 2;
}

.density-slider::-webkit-slider-runnable-track {
  width: 100%;
  height: 6px;
  cursor: pointer;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.3) var(--val, 100%), rgba(255, 255, 255, 0.05) var(--val, 100%));
  border-radius: 3px;
}

.density-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 20px rgba(255, 255, 255, 1);
}

#control-buttons {
  position: absolute;
  bottom: 110px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 16px;
  z-index: 20;
  padding: 0;
  background: transparent;
}

.control-arrow {
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-top: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--text-main);
  width: 56px;
  height: 56px;
  border-radius: 999px;
  cursor: pointer;
  font-family: "Outfit", sans-serif;
  font-size: 26px;
  font-weight: 500;
  transition: all 0.3s ease;
  box-shadow:
    0 8px 20px rgba(0, 0, 0, 0.3),
    inset 0 0 10px rgba(255, 255, 255, 0.02);
  display: grid;
  place-items: center;
  line-height: 1;
}

.control-arrow:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-3px);
  box-shadow:
    0 15px 30px rgba(0, 0, 0, 0.4),
    0 0 20px rgba(255, 255, 255, 0.1);
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.6);
}

.control-arrow:active {
  transform: translateY(-1px);
}

.control-button {
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-top: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--text-main);
  padding: 12px 24px;
  border-radius: 50px;
  cursor: pointer;
  font-family: "Outfit", sans-serif;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  transition: all 0.3s ease;
  box-shadow:
    0 8px 20px rgba(0, 0, 0, 0.3),
    inset 0 0 10px rgba(255, 255, 255, 0.02);
  overflow: hidden;
  position: relative;
  min-width: 100px;
  text-align: center;
}

.control-button:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-4px);
  box-shadow:
    0 15px 30px rgba(0, 0, 0, 0.4),
    0 0 20px rgba(255, 255, 255, 0.1);
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.6);
}

.control-button:active {
  transform: translateY(-1px);
}

.control-button span {
  position: relative;
  z-index: 2;
}

.page-nav {
  position: fixed;
  left: 50%;
  bottom: 40px;
  transform: translateX(-50%);
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-arrow {
  width: 2.5rem;
  height: 2.5rem;
  display: grid;
  place-items: center;
  border-radius: 999px;
  text-decoration: none;
  font-size: 1.35rem;
  color: #f7f8ff;
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.24);
  transition: transform 140ms ease, background 140ms ease;
}

.nav-arrow:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.24);
}

.nav-label {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

@media (max-width: 640px) {
  #instructions-container {
    top: 16px;
    left: 16px;
    right: 16px;
    width: auto;
    padding: 16px;
    background: rgba(10, 10, 15, 0.6);
  }

  #theme-selector {
    top: auto;
    bottom: 100px;
    left: 16px;
    right: 16px;
    width: auto;
    padding: 16px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .theme-grid {
    margin-top: 0;
  }

  #control-buttons {
    bottom: 74px;
    width: 100%;
    justify-content: center;
    gap: 8px;
    padding: 0 16px;
  }

  .control-button {
    padding: 10px 16px;
    min-width: auto;
    font-size: 11px;
    flex: 1;
  }

  .page-nav {
    bottom: 24px;
  }
}