/* General Reset & Typography */
* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f9f9fb;
  margin: 0;
  padding: 0;
}

/* Navigation */
nav {
  background-color: #1a365d; /* Deep lake blue */
  padding: 1rem 2rem;
  display: flex;
  gap: 20px;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.2s;
}

nav a:hover {
  opacity: 0.8;
}

nav a[aria-current="page"] {
  border-bottom: 2px solid #63b3ed;
}

/* Main Layout */
main {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

h1 {
  font-size: 2.5rem;
  color: #2c5282;
  border-bottom: 4px solid #63b3ed;
  padding-bottom: 10px;
  margin-bottom: 30px;
}

h2 {
  font-size: 1.8rem;
  color: #2d3748;
  margin-top: 40px;
}

h3 {
  font-size: 1.5rem;
  text-align: center;
  color: #2b6cb0;
  font-style: italic;
  margin-top: 50px;
  padding: 20px;
  background: #ebf8ff;
  border-radius: 8px;
}

/* Section Styling */
section {
  margin-bottom: 40px;
}

p {
  margin-bottom: 20px;
  font-size: 1.1rem;
}

/* Emphasis & Callouts */
#lake-elevation {
  font-weight: bold;
  color: #e53e3e; /* Warning red */
  font-size: 1.2rem;
}

blockquote {
  margin: 30px 0;
  padding: 20px 40px;
  background: #edf2f7;
  border-left: 5px solid #4a5568;
  font-family: 'Georgia', serif;
  font-style: italic;
}

em {
  display: block;
  font-size: 0.9rem;
  color: #718096;
  margin-top: 10px;
}

/* Chart container is already handled with inline styles in your HTML, 
   but adding responsiveness here just in case */
canvas {
  max-width: 100%;
  height: auto !important;
}