:root {
  /* Layout measurements */
  --plank-width: 400px;
  --plank-height: 20px;
  --pivot-size: 40px;

  /* Colors */
  --bg-main: #fff;
  --bg-light: #f5f5f5;
  --bg-seesaw: #ff7f50;
  --color-text: #333;
  --color-muted: #888;
  --color-black: #000;
  --color-light-gray: #e0e0e0;

  --radius-sm: 7px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

body {
  margin: 0;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  gap: 20px;
  font-family: 'CodeNewRoman Nerd Font Propo', monospace;
  background-color: var(--bg-light);
  box-sizing: border-box;
}

.main-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
  padding: 24px;
  background-color: var(--bg-main);
  border-radius: var(--radius-lg);
  border: 2px solid var(--color-light-gray);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
  width: 800px;
  max-width: 90vw;
  box-sizing: border-box;
}

#info-panel {
  display: flex;
  gap: 40px;
  font-size: 18px;
  font-weight: bold;
  padding: 20px;
}

.info-item {
  background-color: var(--bg-light);
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
  text-align: center;
  min-width: 120px;
}

.info-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.info-value {
  font-size: 24px;
  font-weight: bold;
  color: var(--color-text);
}

.viewport {
  background-color: var(--bg-light);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
  padding: 80px 100px;
  overflow: hidden;
}

#seesaw-container {
  position: relative;
  width: var(--plank-width);
  height: 200px;
}

#seesaw {
  position: absolute;
  width: var(--plank-width);
  height: var(--plank-height);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  cursor: pointer;
  background-color: var(--bg-seesaw);
  transform-origin: center;
  transition: transform 0.5s ease;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

#pivot {
  position: absolute;
  width: var(--pivot-size);
  height: var(--pivot-size);
  top: calc(50% + var(--plank-height) / 2);
  left: calc(50% - var(--pivot-size) / 2);
  background-color: var(--color-black);
  clip-path: polygon(50% 0%, 100% 100%, 0% 100%);
}

.weight {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  border: 2px solid var(--color-black);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.weight-number {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--bg-main);
  font-weight: bold;
}

#weight-entry {
  max-height: 180px;
  overflow-y: auto;
  background-color: var(--bg-light);
  border-radius: var(--radius-sm);
  padding: 15px;
  width: 570px;
  max-width: 100%;
  box-sizing: border-box;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.06);
}

#weight-entry div {
  padding: 12px 15px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-light-gray);
  font-size: 14px;
  color: var(--color-text);
  background-color: var(--bg-main);
}

.weight-drop {
  animation: dropWeight 0.6s ease;
}

@keyframes dropWeight {
  0% {
    top: -250px;
  }
}

#reset-btn {
  padding: 10px 20px;
  font-size: 16px;
  font-weight: bold;
  background-color: var(--color-text);
  color: var(--bg-main);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.5s ease;
  margin-bottom: 8px;
}

#reset-btn:hover {
  background-color: #555;
}