body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
  padding: 10px;
  background-color: #eef1f5;
  min-height: 100vh;
  box-sizing: border-box;
}

.toolbar {
  background-color: #ffffff;
  padding: 10px 15px;
  margin-bottom: 15px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  width: 95%;
  max-width: 1000px;
  box-sizing: border-box;
}

.toolbar label,
.toolbar input[type="color"],
.toolbar input[type="range"],
.toolbar span,
.toolbar button {
  margin: 5px 0;
}

.toolbar label {
  font-weight: 500;
  color: #333;
}

.toolbar input[type="color"] {
  width: 40px;
  height: 30px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 0;
}

.toolbar input[type="range"] {
  flex-grow: 1;
  min-width: 100px;
  max-width: 200px;
}

.toolbar span#brushSizeValue {
  min-width: 25px;
  text-align: right;
  font-weight: 500;
  color: #333;
}

#drawingCanvas {
  width: 1000px;
  height: 700px;
  border: 2px solid #d0d0d0;
  background-color: #ffffff;
  cursor: crosshair;
  touch-action: none;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

button,
.tool-button {
  padding: 10px 15px;
  border: 1px solid transparent;
  background-color: #007bff;
  color: white;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease,
    transform 0.1s ease;
  font-weight: 500;
  font-size: 0.9rem;
}

button:hover,
.tool-button:hover {
  background-color: #0056b3;
  transform: translateY(-1px);
}

button:active,
.tool-button:active {
  transform: translateY(0px);
}

#clearButton {
  background-color: #dc3545;
}
#clearButton:hover {
  background-color: #c82333;
}

.tool-button {
  background-color: #f0f0f0;
  color: #333;
  border: 1px solid #ccc;
}

.tool-button:not(.active-tool):hover {
  background-color: #e0e0e0;
  border-color: #bbb;
}

.tool-button.active-tool {
  background-color: #007bff;
  color: white;
  border-color: #0056b3;
  font-weight: bold;
  box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

footer {
  width: 100%;
  padding: 15px 0;
  margin-top: auto;
  background-color: #f0f0f0;
  text-align: center;
  border-top: 1px solid #d0d0d0;
  box-sizing: border-box;
}

footer p {
  margin: 0;
  font-size: 0.85em;
  color: #555;
}

footer a {
  color: #007bff;
  text-decoration: none;
  font-weight: 500;
}

footer a:hover {
  text-decoration: underline;
  color: #0056b3;
}

@media (max-width: 768px) {
  .toolbar {
    padding: 10px;
    gap: 8px;
  }
  .toolbar label,
  .toolbar input[type="color"],
  .toolbar input[type="range"],
  .toolbar span,
  .toolbar button {
    font-size: 0.85rem;
    padding: 8px 10px;
  }
  .toolbar input[type="range"] {
    min-width: 80px;
  }
  #drawingCanvas {
    width: 95vw;
    height: 60vh;
  }
}

@media (max-width: 480px) {
  .toolbar {
    justify-content: space-around;
  }
  .toolbar label {
    display: none;
  }
  .toolbar input[type="color"] {
    width: 35px;
    height: 25px;
  }
  .toolbar span#brushSizeValue {
    display: none;
  }
}