:root {
  /* Core Backgrounds */
  --background: #ffffff;
  --foreground: #111111;
  --card: #f4f4f4;
  --secondary: #e6f7ed;

  /* Text */
  --muted-foreground: #555555;

  /* Borders & Lines */
  --border: #ddd;

  /* Brand Colors */
  --primary: #00b050;
  --primary-foreground: #ffffff;
  --accent: #00b050;
  --accent-soft: rgba(0, 176, 80, 0.12);

  /* Radius */
  --radius: 8px;
}

/* Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Body & Layout */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--background);
  color: var(--foreground);
  line-height: 1.8;
  scroll-behavior: smooth;
}

main {
  margin: 1rem 1.5rem;
}

.container {
  max-width: 850px;
  margin: auto;
}

/* Headings */
h1 {
  color: var(--primary);
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

/* Date / Meta info */
.date {
  font-size: 0.9rem;
  color: var(--muted-foreground);
  margin-bottom: 2rem;
}

/* Details / Summary Styling */
details {
  margin-bottom: 1rem;
}

summary {
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.75rem 1rem;
  background-color: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: background-color 0.3s ease;
  color: var(--primary);
}

summary:hover {
  background-color: var(--secondary);
}

details[open] summary {
  background-color: var(--accent-soft);
  font-weight: 700;
}

/* Content inside details */
.content {
  padding: 1rem 1.5rem;
  background-color: #ffffff;
  border-left: 3px solid var(--primary);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
  margin-top: -1px;
}

.content ul {
  padding-left: 1.5rem;
}

.content li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
  color: var(--muted-foreground);
}

.content p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--muted-foreground);
}

/* Links */
a {
  color: var(--primary);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* Footer */
.footer {
  background-color: var(--card);
  color: var(--foreground);
  text-align: center;
  padding: 2rem 1.5rem;
  margin-top: 4rem;
  border-top: 1px solid var(--border);
}

.footer-content p {
  margin: 0;
  font-size: 0.95rem;
}

.footer-right {
  font-family: monospace;
  color: #555;
}