:root {
  --bg: rgb(255, 255, 255);
  --fg: rgb(0, 0, 0);
  --fg-muted: rgb(100, 100, 100);
  --border: #000;
  --border-row: rgb(100, 100, 100);
  --select-bg: #fff;
  --bar-color: #2a6fdb;
  --bar-label: #000;
}

body.dark-mode {
  --bg: #0f1117;
  --fg: #e8eaf0;
  --fg-muted: #8b95a8;
  --border: #444;
  --border-row: #333;
  --select-bg: #1e2130;
  --bar-color: #4d9fff;
  --bar-label: #e8eaf0;
}

#dark-mode-toggle {
  position: fixed;
  top: 14px;
  right: 18px;
  z-index: 999;
  background: var(--select-bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 14px;
  transition: background 0.2s, color 0.2s;
}
#dark-mode-toggle:hover { opacity: 0.8; }

* { box-sizing: border-box; }

#filters, select { font-size: large; }

select {
  background-color: var(--select-bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
}

body {
  font-family: 'Arial', sans-serif;
  margin: 0;
  padding: 20px;
  background-color: var(--bg);
  color: var(--fg);
  font-size: 16px;
  line-height: 1.6;
  transition: background-color 0.25s, color 0.25s;
}

h1 { font-size: 28px; margin-bottom: 10px; }
h2 { font-size: 22px; margin-top: 30px; margin-bottom: 10px; }
h3 { font-size: 18px; margin-bottom: 8px; }
p { font-size: 16px; margin: 8px 0; }
em { font-style: italic; }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 20px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

table th, table td {
  padding: 10px 8px;
  text-align: left;
  border-bottom: 1px solid var(--border-row);
}

table th {
  border-bottom: 2px solid var(--border);
  font-weight: bold;
}

.table-wrapper {
  overflow-x: auto;
  margin-bottom: 20px;
}

.group-section { margin-bottom: 50px; }

@media (max-width: 768px) {
  body { padding: 15px; font-size: 15px; }
  h1 { font-size: 24px; }
  h2 { font-size: 20px; margin-top: 25px; }
  h3 { font-size: 16px; }
  p { font-size: 15px; margin: 6px 0; }
  table { font-size: 13px; }
  table th, table td { padding: 8px 6px; }
  .table-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .group-section { margin-bottom: 40px; }
}

@media (max-width: 480px) {
  body { padding: 12px; font-size: 14px; }
  h1 { font-size: 20px; margin-bottom: 8px; }
  h2 { font-size: 18px; margin-top: 20px; }
  h3 { font-size: 15px; margin-bottom: 6px; }
  p { font-size: 14px; margin: 5px 0; }
  table { font-size: 12px; }
  table th, table td { padding: 6px 4px; }
  .group-section { margin-bottom: 30px; }
}

#degreeChart {
  width: 100%;
  max-width: 800px;
  height: 400px;
  display: block;
  margin: 20px auto;
}