:root {
  --note-backgruond-color: #141311;
  --toolbar-background: rgba(34, 31, 29, 0.9);
  --shadow: rgba(0, 0, 0, 0.4);
  --primary: #f5dfc6;
  --outline: #494643;
  --red: #ffb4ab;
  --red-hovered: #690005;
  --button-hovered: #524532;
}

/* Reset & Basic Layout */
body,
html {
  margin: 0;
  padding: 0;
  height: 100dvh;
  background-color: var(--note-backgruond-color);
  overflow: hidden;
  font-family: sans-serif;
}

/* The Viewer Canvas */
#openseadragon1 {
  width: 100%;
  height: 100%;
  background-color: var(--note-backgruond-color);
}

/* --- Floating Toolbar --- */
.toolbar {
  position: absolute;
  bottom: 25px;
  left: 20px;
  z-index: 1000;
  display: flex;
  gap: 12px;
  padding: 10px 20px;
  background: var(--toolbar-background);
  border: 1px solid var(--outline);
  border-radius: 50px;
  box-shadow: 0 4px 15px var(--shadow);
  transition: opacity 0.5s ease, transform 0.5s ease;
  opacity: 1;
}

.toolbar.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
}

/* Buttons */
.tool-btn {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 20px;
  cursor: pointer;
  padding: 12px;
  border-radius: 50%;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

#hide-toolbar {
  color: var(--red)
}

#show-toolbar {
  position: absolute;
  bottom: 25px;
  left: 20px;
  z-index: 999;
  background: var(--toolbar-background);
  color: var(--primary);
  border: 1px solid var(--outline);
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 24px;
  cursor: pointer;
  transition: all 0.3s ease;
  opacity: 0;
  pointer-events: none;
}

#show-toolbar.visible {
  opacity: 1;
  pointer-events: auto;
}

#show-toolbar:hover {
  background: var(--button-hovered);
  color: white;
}

.tool-btn:hover {
  background: var(--button-hovered);
  /* Hover color */
  color: #fff;
  transform: translateY(-2px);
}

.tool-btn:active {
  transform: translateY(0);
}

/* Back Button */
#back-btn {
  position: absolute;
  top: 20px;
  left: 20px;
  z-index: 1000;
  color: var(--primary);
  text-decoration: none;
  font-weight: bold;
  font-size: 24px;
  transition: color 0.2s;
}

#back-btn:hover {
  color: #fff;
}

@media (max-width: 768px) {
  .toolbar {
    position: fixed;
    right: auto;
    left: 50%;
    transform: translateX(-50%);
    bottom: 20px;
    max-width: 90vw;
    padding: 8px 16px;
    gap: 0px;
  }

  #show-toolbar {
    position: absolute;
    bottom: 20px;
    left: 20px;
  }

  #back-btn {
    top: 20px;
    left: 20px
  }

}

@media (max-width: 380px) {
  .toolbar {
    position: fixed;
    right: auto;
    left: 50%;
    transform: translateX(-50%);
    bottom: 8px;
    max-width: 90vw;
    padding: 8px 16px;
    gap: 0px;
  }

  .tool-btn {
    font-size: 25px;
    padding: 6px;
  }

  #show-toolbar {
    position: absolute;
    bottom: 8px;
    left: 8px;
  }

  #back-btn {
    top: 8px;
    left: 8px
  }

}