:root {
  --primary-color: #616161;
  --text-color: #4f4f4f;
  --border-color: #ddd;
  --link-color: #2196f3;
  --link-hover-color: #1976d2;
  --bg-color: #f5f5f5;
}

body {
  font-family: "Roboto", Arial, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

.header-panel {
  width: 100%;
  padding: 10px 0;
  display: flex;
  justify-content: flex-start;
  border-bottom: 1px solid var(--border-color);
}

h1 {
  margin: 0;
  font-size: 1.5em;
  letter-spacing: 1px;
  font-weight: 300;
  color: var(--text-color);
  padding-left: 20px;
}

button {
  padding: 12px 24px;
  margin: 5px;
  font-size: 16px;
  cursor: pointer;
  border: 2px solid var(--primary-color);
  border-radius: 5px;
  background-color: transparent;
  color: var(--primary-color);
}

button:hover,
.button-active {
  background-color: var(--primary-color);
  color: white;
}

.button-container {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.buttons-row {
  display: flex;
  flex-direction: row;
  justify-content: center;
}

.add-behavior {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 32px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: #fff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  width: 80%;
  max-width: 600px;
  gap: 16px;
}

.add-behavior input,
.add-behavior select {
  padding: 12px 16px;
  margin: 8px 0;
  font-size: 16px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  width: 100%;
  box-sizing: border-box;
}

.add-behavior .button-container {
  width: 100%;
  flex-direction: row;
  margin-top: 16px;
  gap: 12px;
  justify-content: center;
}

.hint-text {
  color: #666;
  font-size: 16px;
  margin: 16px 24px;
  padding: 16px 24px;
  border-radius: 12px;
  background: linear-gradient(145deg, #ffffff, #f8f9fa);
  text-align: center;
  line-height: 1.6;
  max-width: 400px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03), 0 1px 3px rgba(0, 0, 0, 0.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hint-text:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.04), 0 2px 4px rgba(0, 0, 0, 0.06);
}

.hint-text p {
  margin: 0;
}

.hint-text p + p {
  margin-top: 8px;
  font-size: 14px;
  color: #888;
}

.hint-text a {
  color: var(--link-color);
  text-decoration: none;
  border-bottom: 1px dashed rgba(33, 150, 243, 0.4);
  transition: all 0.2s ease;
}

.hint-text a:hover {
  color: var(--link-hover-color);
  border-bottom-color: rgba(25, 118, 210, 0.6);
}