html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: "MS Sans Serif", Tahoma, Geneva, sans-serif;
  background-color: white; /* Windows 98 white */
  color: #000080; /* Windows 98 blue text */
  user-select: none;
  overflow: hidden;
}

.container {
  box-sizing: border-box;
  width: 100vw;
  height: 100vh;
  background: white;
  display: flex;
  flex-direction: column;
  padding: 8px 16px;
  overflow: hidden;
  color: #000080;
  box-shadow: inset 2px 2px 5px #cccccc, inset -2px -2px 5px #ffffff;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 3px outset #000080;
  padding: 8px 12px;
  user-select: text;
  flex-shrink: 0;
  background-color: #000080;
  color: white;
  font-weight: bold;
  font-size: 1.4rem;
  text-shadow: 1px 1px 0 #000040;
  flex-wrap: wrap;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

nav a {
  text-decoration: none;
  color: white;
  background-color: #000080;
  border: 2px outset #000040;
  padding: 4px 10px;
  font-weight: bold;
  box-shadow: 2px 2px 0 #102060;
  cursor: pointer;
  user-select: none;
  transition: background-color 0.3s, color 0.3s;
}

nav a:hover,
nav a:focus,
nav a[aria-current="page"] {
  border-style: inset;
  background-color: #2744a3;
  color: #ffffff;
  outline: none;
}

.info-circle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: #000080;
  border: 2px outset #000040;
  font-weight: bold;
  font-size: 22px;
  text-align: center;
  line-height: 36px;
  color: white;
  cursor: pointer;
  user-select: none;
  box-shadow: 2px 2px 0 #102060;
  transition: background-color 0.3s, color 0.3s;
}

.info-circle:hover,
.info-circle:focus {
  border-style: inset;
  background-color: #2744a3;
  color: #ffffff;
  outline: none;
}

main {
  flex-grow: 1;
  overflow-y: auto;
  padding: 12px;
  background-color: white;
  border: 4px solid #000080;
  box-shadow: inset 2px 2px 5px #cccccc, inset -2px -2px 5px white;
  display: flex;
  flex-direction: column;
  user-select: text;
}

main h2,
main h3 {
  color: #000080;
  margin-top: 15px;
  margin-bottom: 10px;
}

main p,
main ul {
  margin-bottom: 10px;
  line-height: 1.5;
}

main ul {
  padding-left: 25px;
}

main li {
  margin-bottom: 5px;
}

label {
  font-weight: bold;
  color: #000080;
}

input,
button,
select,
textarea {
  font-family: "MS Sans Serif", Tahoma, Geneva, sans-serif;
  font-size: 14px;
  margin: 6px 10px 10px 0;
  padding: 6px 10px;
  border: 2px outset #000080;
  box-shadow: 2px 2px 0 #102060;
  background-color: white;
  color: #000080;
  user-select: text;
}

input:focus,
select:focus,
button:focus,
textarea:focus {
  outline: none;
  border-style: inset;
  background-color: #ffffff;
  color: #000080;
}

button {
  cursor: pointer;
  font-weight: bold;
  width: 140px;
}

.visualization-area {
  margin-top: 20px;
  background: #f0f4ff;
  border: 3px inset #000080;
  min-height: 300px;
  padding: 12px;
  position: relative;
  font-family: monospace;
  overflow-x: auto;
  white-space: nowrap;
  user-select: none;
  box-shadow: inset 1px 1px 4px white, inset -1px -1px 4px #8888ff;
  display: flex;
  align-items: center;
  gap: 6px;
  color: #000080;
}

.mem-block {
  position: relative;
  height: 80px;
  min-width: 60px;
  border: 2px outset #000080;
  background-color: #a0aaff;
  box-shadow: 2px 2px 0 #102060;
  color: #000080;
  font-weight: bold;
  text-align: center;
  padding-top: 28px;
  user-select: none;
  transition: background-color 0.5s ease;
  cursor: default;
}

.mem-block.allocated {
  background-color: #000080;
  color: white;
  box-shadow: 2px 2px 8px #0011ff;
}

.mem-block.fragment {
  background-color: #e0e0ff;
  color: #5555aa;
  font-style: italic;
  box-shadow: none;
}

.mem-label {
  position: absolute;
  top: 6px;
  left: 6px;
  font-size: 11px;
  color: #000080;
  font-weight: normal;
  user-select: none;
}

.status-text {
  margin-top: 10px;
  font-weight: bold;
  font-size: 1.1rem;
  min-height: 24px;
  color: #000080;
  user-select: none;
}

/* Scrollbar for visualization area */
.visualization-area::-webkit-scrollbar {
  height: 8px;
}
.visualization-area::-webkit-scrollbar-thumb {
  background-color: #2744a3;
  border-radius: 4px;
}
@media (max-width: 600px) {
  header {
    font-size: 1rem;
    padding: 8px 6px;
  }
  main {
    padding-bottom: 60px;
  }
}