:root {
  --bg: #00103a;
  --panel: #f5f7ff;
  --text: #111;
  --link: #0018d8;
  --accent: #ff4d00;
  --border: #000;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Verdana", "Tahoma", sans-serif;
  background: radial-gradient(circle at top, #1f4a94 0%, var(--bg) 55%, #000 100%);
  color: var(--text);
}

.page {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 220px;
  padding: 16px;
  background: linear-gradient(180deg, #111 0%, #2b2b2b 100%);
  border-right: 3px ridge #7f7f7f;
  color: #fff;
}

.sidebar h2 {
  margin-top: 0;
  font-size: 1rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: #ffe200;
}

.nav-list {
  list-style: square;
  padding-left: 20px;
}

.nav-list li {
  margin: 10px 0;
}

.nav-list a {
  color: #9fe7ff;
  font-weight: bold;
  text-decoration: underline;
}

.content {
  flex: 1;
  max-width: 900px;
  margin: 16px;
  padding: 20px;
  background: var(--panel);
  border: 3px outset #ccc;
}

h1 {
  margin-top: 0;
  font-family: "Trebuchet MS", "Verdana", sans-serif;
  text-transform: uppercase;
  letter-spacing: 2px;
}

a {
  color: var(--link);
}

a:hover {
  color: var(--accent);
}

.marquee {
  margin-bottom: 16px;
  padding: 4px;
  border: 2px dashed #999;
  background: #fff7cc;
  font-weight: bold;
}

.footer-note {
  margin-top: 24px;
  font-size: 0.85rem;
  color: #444;
}

@media (max-width: 700px) {
  .page {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 3px ridge #7f7f7f;
  }

  .content {
    margin: 12px;
  }
}