:root {
  --primary-color: #45171d;  /* Dark navy */
  --accent-color: #e84a5f;   /* Teal */
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  user-select: none;
}

body {
  background-color: #ffffff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: center;
}

.title {
  background-color: var(--primary-color);
  color: white;
  padding: 0.8em 0;
  font-size: 1.5em;
  font-weight: bold;
  letter-spacing: 1px;
}

.navbar {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 1em;
  background-color: var(--accent-color);
  padding: 0.7em;
}

.navbar a {
  all: unset;
  background-color: white;
  color: var(--primary-color);
  font-weight: 600;
  padding: 0.5em 1em;
  border-radius: 6px;
  transition: 0.3s ease;
  cursor: pointer;
}

.navbar a:hover {
  background-color: var(--primary-color);
  color: white;
}

#menu,
#random,
#start {
  cursor: pointer;
  border: none;
  padding: 0.4em 0.8em;
  border-radius: 4px;
  background-color: white;
  color: var(--primary-color);
  font-weight: bold;
}

.center {
  margin: 1em auto;
  box-shadow: rgba(0, 0, 0, 0.15) 0px 4px 12px;
  height: 420px;
  width: 410px;
  background-color: #ffffff;
  border-radius: 8px;
  overflow: hidden;
}

.array {
  display: flex;
  align-items: flex-end;
  height: 100%;
  padding: 1rem;
  gap: 2px;
}

.cell {
  flex: 0.5;
  width: 0.000001%;
  background-color: #d1d5db;
  margin: 0 1px;
  transition: all 0.4s ease-in-out;
  border-radius: 3px 3px 0 0;
}

.cell.visited {
  background-color: var(--accent-color);
}

.cell.current {
  background-color: #0ea5e9; /* Sky Blue */
}

.cell.min {
  background-color: #facc15; /* Amber Yellow */
}

.cell.done {
  background-color: #22c55e; /* Green */
}

/* Footer */
footer {
  text-align: center;
  font-size: 16px;
  color: var(--primary-color);
  padding: 1.2em;
  background-color: #e2e8f0;
  margin-top: auto;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
}

footer a.link {
  text-decoration: none;
  font-weight: bold;
  color: var(--accent-color);
  font-size: 18px;
  transition: color 0.3s;
}

footer a.link:hover {
  color: var(--primary-color);
}

/* Responsive */
@media screen and (max-width: 600px) {
  .navbar {
    gap: 0.4em;
  }

  .title {
    font-size: 18px;
  }

  .navbar a {
    font-size: 14px;
    padding: 6px 10px;
  }

  .center {
    width: 95%;
  }

  footer {
    font-size: 14px;
  }
}