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

/* Base styles */
html, body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f8f9fa;
  color: #212529;
  min-height: 100vh;
  line-height: 1.6;
}

/* Container utility */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
}

/* Header */
header {
  background-color: #2c3e50;
  color: #ecf0f1;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header .container {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 1rem 0;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 700;
}

header nav {
  display: flex;
  gap: 1rem;
}

header nav a {
  color: #ecf0f1;
  text-decoration: none;
  font-weight: 600;
  padding: 0.3rem 0.6rem;
  border-radius: 3px;
  transition: background-color 0.2s ease-in-out;
}

header nav a:hover,
header nav a:focus {
  background-color: #34495e;
}

/* Layout */
.layout {
  display: flex;
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  gap: 2rem;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background-color: #ffffff;
  border-right: 1px solid #e0e0e0;
  padding: 1.5rem;
  font-size: 0.95rem;
  box-shadow: 2px 0 5px rgba(0, 0, 0, 0.05);
}
/* .sidebar nav .menu-year {
  font-weight: bold;
  margin-bottom: 1rem;
  font-size: 1.1rem;
} */
.sidebar .menu-year {
  font-weight: 700;
  font-size: 1.2rem;
  color: #333333;
  margin-bottom: 1rem;
  border-bottom: 2px solid #2c3e50;
  padding-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.sidebar nav ul {
  list-style: none; /* Remove default bullets */
  padding-left: 0; /* Remove indent */
}

.sidebar .menu-month {
  margin-bottom: 1rem;
  font-weight: 600;
  color: #555555;
}

.sidebar .menu-month ul {
  list-style: none;
  padding-left: 1rem;
  margin-top: 0.3rem;
}

.sidebar .menu-month li a {
  color: #2c3e50;
  text-decoration: none;
  display: block;
  padding: 0.2rem 0;
  transition: color 0.2s ease-in-out;
}

.sidebar .menu-month li a:hover {
  color: #1a73e8;
  text-decoration: underline;
}
/* Main content */
main.container {
  flex: 1;
  background-color: #ffffff;
  padding: 2rem;
  border-radius: 6px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

main h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  border-bottom: 2px solid #2c3e50;
  padding-bottom: 0.3rem;
}

main article p {
  font-size: 1rem;
  color: #444;
}

/* Responsive */
@media (max-width: 900px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid #e0e0e0;
    margin-bottom: 1rem;
  }

  main.container {
    margin: 0;
  }
}