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

body {
  font-family: Arial, sans-serif;
  background-color: #f5f5f5;
  color: #333;
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

/* ---------- Layout ---------- */
.container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 240px;
  background-color: #1e293b;  /* ???? ??? ?????? ?????? */
  color: #fff;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 20px;
  background-color: #152236;
  text-align: center;
}

.sidebar-header h2 {
  font-size: 1.5rem;
}

.nav-menu ul li {
  border-top: 1px solid #334155;
}

.nav-menu ul li a {
  display: block;
  padding: 15px 20px;
  color: #cbd5e1;
}

.nav-menu ul li a:hover {
  background-color: #334155;
  color: #fff;
}

/* Main content */
.main-content {
  flex-grow: 1;
  padding: 20px;
  background-color: #fff;
}

.main-header h1 {
  margin-bottom: 20px;
  color: #0f172a;
}

.content article {
  margin-bottom: 30px;
}