:root {
  --bg-primary: #fafafa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f4f4f5;
  --text-primary: #18181b;
  --text-secondary: #71717a;
  --border-color: #e4e4e7;
  --accent: #0ea5e9;
  --accent-hover: #0284c7;
  --accent-light: #e0f2fe;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --purple: #8b5cf6;
  --purple-hover: #7c3aed;
  --node-default: #ffffff;
  --node-start: #10b981;
  --node-end: #ef4444;
  --node-wall: #18181b;
  --node-visited: #7dd3fc;
  --node-path: #fbbf24;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --grid-line: #d4d4d8;
  --radius: 12px;
  --radius-sm: 8px;
}

[data-theme="dark"] {
  --bg-primary: #09090b;
  --bg-secondary: #18181b;
  --bg-tertiary: #27272a;
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --border-color: #3f3f46;
  --accent: #38bdf8;
  --accent-hover: #0ea5e9;
  --accent-light: #0c4a6e;
  --node-default: #27272a;
  --node-wall: #fafafa;
  --node-visited: #0369a1;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --grid-line: #52525b;
}

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

body {
  font-family: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Redesigned header with brand styling */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  border-radius: var(--radius-sm);
  color: white;
}

header h1 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
}

.theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.theme-btn:hover {
  background-color: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

.sun-icon {
  display: none;
}

[data-theme="dark"] .sun-icon {
  display: block;
}

[data-theme="dark"] .moon-icon {
  display: none;
}

main {
  flex: 1;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  background-color: var(--bg-primary);
}

/* Added wrapper for controls with card styling */
.controls-wrapper {
  width: 100%;
  max-width: 1100px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  justify-content: center;
  align-items: flex-end;
  padding: 1.5rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-group label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.maze-controls {
  display: flex;
  gap: 0.5rem;
}

.maze-controls select {
  min-width: 160px;
}

select {
  padding: 0.625rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  min-width: 180px;
}

select:hover {
  border-color: var(--accent);
}

select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.button-group {
  display: flex;
  gap: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn.primary {
  background-color: var(--accent);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn.primary:hover:not(:disabled) {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

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

.btn.secondary:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
  background-color: var(--accent-light);
}

.btn.maze-btn {
  background-color: var(--purple);
  color: white;
  white-space: nowrap;
}

.btn.maze-btn:hover:not(:disabled) {
  background-color: var(--purple-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.legend-box {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

.legend-box.start {
  background-color: var(--node-start);
  border-color: var(--node-start);
}

.legend-box.end {
  background-color: var(--node-end);
  border-color: var(--node-end);
}

.legend-box.wall {
  background-color: var(--node-wall);
  border-color: var(--node-wall);
}

.legend-box.path {
  background-color: var(--node-path);
  border-color: var(--node-path);
}

.grid-container {
  overflow: auto;
  max-width: 100%;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background-color: var(--bg-secondary);
  padding: 1rem;
  box-shadow: var(--shadow);
}

.grid {
  display: grid;
  gap: 1px;
  background-color: var(--grid-line);
  border-radius: 4px;
  overflow: hidden;
}

.node {
  width: 25px;
  height: 25px;
  background-color: var(--node-default);
  border: 1px solid var(--grid-line);
  transition: background-color 0.1s ease;
  cursor: pointer;
}

.node:hover {
  background-color: var(--bg-tertiary);
}

.node.start {
  background-color: var(--node-start);
  border-color: var(--node-start);
}

.node.end {
  background-color: var(--node-end);
  border-color: var(--node-end);
}

.node.wall {
  background-color: var(--node-wall);
  animation: wallPop 0.2s ease-out;
}

@keyframes wallPop {
  0% {
    transform: scale(0.5);
  }
  100% {
    transform: scale(1);
  }
}

.node.visited {
  background-color: var(--node-visited);
  animation: visitedPulse 0.4s ease-out;
}

@keyframes visitedPulse {
  0% {
    transform: scale(0.3);
    background-color: var(--accent);
  }
  50% {
    background-color: var(--accent);
  }
  100% {
    transform: scale(1);
    background-color: var(--node-visited);
  }
}

.node.path {
  background-color: var(--node-path);
  animation: pathGlow 0.5s ease-out;
}

@keyframes pathGlow {
  0% {
    transform: scale(0.5);
    background-color: var(--node-visited);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
    background-color: var(--node-path);
  }
}

.node.wall-animate {
  background-color: var(--node-wall);
  animation: mazeWallPop 0.3s ease-out;
}

@keyframes mazeWallPop {
  0% {
    transform: scale(0);
    background-color: var(--purple);
  }
  50% {
    transform: scale(1.3);
  }
  100% {
    transform: scale(1);
    background-color: var(--node-wall);
  }
}

.node.carve-animate {
  animation: carvePop 0.3s ease-out;
}

@keyframes carvePop {
  0% {
    transform: scale(0.5);
    background-color: var(--success);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
    background-color: var(--node-default);
  }
}

.instructions {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  text-align: center;
}

/* Redesigned footer with social links */
footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 1.25rem 2rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-credit {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-credit strong {
  color: var(--text-primary);
  font-weight: 600;
}

.social-links {
  display: flex;
  gap: 0.75rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.social-link:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  background-color: var(--accent-light);
}

.social-link svg {
  flex-shrink: 0;
}

@media (max-width: 768px) {
  header {
    padding: 1rem;
  }

  header h1 {
    font-size: 1.125rem;
  }

  main {
    padding: 1rem;
  }

  .controls {
    padding: 1rem;
  }

  .control-group {
    width: 100%;
  }

  select {
    width: 100%;
    min-width: auto;
  }

  .maze-controls {
    flex-direction: column;
  }

  .maze-controls select {
    min-width: auto;
  }

  .button-group {
    flex-wrap: wrap;
    width: 100%;
  }

  .btn {
    flex: 1;
    min-width: 100px;
  }

  .node {
    width: 20px;
    height: 20px;
  }

  .footer-content {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .social-links {
    justify-content: center;
  }
}