/* Modern Dark Theme Styles */
:root {
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #2d2d2d;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --accent-primary: #7f5af0;
  --accent-secondary: #2cb67d;
  --border-color: #333;
  --shadow-color: rgba(0, 0, 0, 0.5);
}

/* Base Styles */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 2rem;
  background-color: var(--bg-secondary);
  border-radius: 12px;
  box-shadow: 0 8px 32px var(--shadow-color);
}

/* Typography */
h1, h2, h3 {
  color: var(--text-primary);
  font-weight: 600;
  margin: 0 0 1.5rem;
}

h1 {
  font-size: 2.5rem;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Tab Styling */
.tabs {
  display: flex;
  gap: 0.5rem;
  margin: 2rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.tab-button {
  padding: 0.75rem 1.5rem;
  background: transparent;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab-button:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.tab-button.active {
  background: var(--bg-tertiary);
  color: var(--accent-primary);
  box-shadow: 0 2px 0 var(--accent-primary);
}

/* Controls */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0;
  align-items: center;
}

button, select {
  padding: 0.75rem 1.25rem;
  border: none;
  border-radius: 8px;
  background-color: var(--accent-primary);
  color: white;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.2s, background-color 0.2s;
}

button:hover {
  background-color: #6f4bd8;
  transform: translateY(-2px);
}

button:active {
  transform: translateY(0);
}

select {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

input[type="range"] {
  accent-color: var(--accent-primary);
}

/* Visualization Areas */
.visualization-area {
  width: 100%;
  height: 500px;
  background-color: var(--bg-tertiary);
  border-radius: 12px;
  margin: 1rem 0;
  overflow: hidden;
  position: relative;
}

/* Sorting Visualization */
.array-element {
  position: absolute;
  bottom: 0;
  background: linear-gradient(to top, var(--accent-primary), var(--accent-secondary));
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 500;
  font-size: 0.75rem;
  border-radius: 4px 4px 0 0;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.2);
}

.array-element.highlight {
  background: #ff7e5f;
}

.array-element.sorted {
  background: var(--accent-secondary);
}

/* Pathfinding Grid */
#pathfinding-grid {
  display: grid;
  gap: 1px;
  background-color: var(--border-color);
}

.grid-node {
  background-color: var(--bg-secondary);
  transition: all 0.15s ease-out;
}

.grid-node.start {
  background-color: var(--accent-secondary);
}

.grid-node.end {
  background-color: #ff7e5f;
}

.grid-node.wall {
  background-color: #3a3a3a;
}

.grid-node.visited {
  background-color: rgba(127, 90, 240, 0.3);
}

.grid-node.path {
  background-color: var(--accent-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
    margin: 1rem;
  }
  
  .controls {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .visualization-area {
    height: 400px;
  }
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.container {
  animation: fadeIn 0.4s ease-out;
}