:root {
  /* Default colors - will be overridden by theme */
  --color-primary: #3b82f6;
  --color-secondary: #8b5cf6;
  --color-accent: #ec4899;
  --color-background: #ffffff;
  --color-text: #1f2937;
  --color-border: #e5e7eb;
  --color-surface: #f9fafb;

  /* Layout - desktop */
  --layout-sidebar-width: 250px;
  --layout-card-radius: 8px;
  --spacing: 16px;
}

/* Tablet breakpoint */
@media (max-width: 1024px) {
  :root {
    --layout-sidebar-width: 200px;
    --layout-card-radius: 6px;
    --spacing: 12px;
  }
}

/* Mobile breakpoint */
@media (max-width: 640px) {
  :root {
    --layout-sidebar-width: 0px;
    --layout-card-radius: 4px;
    --spacing: 8px;
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
}

/* Utility classes */
.text-primary {
  color: var(--color-primary);
}

.text-secondary {
  color: var(--color-secondary);
}

.bg-primary {
  background-color: var(--color-primary);
}

.bg-surface {
  background-color: var(--color-surface);
}

.border {
  border: 1px solid var(--color-border);
}

.rounded {
  border-radius: var(--layout-card-radius);
}

.p-spacing {
  padding: var(--spacing);
}

.m-spacing {
  margin: var(--spacing);
}

.gap-spacing {
  gap: var(--spacing);
}

/* Button styles */
button, .btn {
  padding: calc(var(--spacing) / 2) var(--spacing);
  border: none;
  border-radius: var(--layout-card-radius);
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.3s ease;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

/* Card styles */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--layout-card-radius);
  padding: var(--spacing);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* Sidebar */
.sidebar {
  width: var(--layout-sidebar-width);
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: var(--spacing);
  min-height: 100vh;
  transition: width 0.3s ease;
}

/* Main container */
.container {
  display: flex;
  min-height: 100vh;
}

.content {
  flex: 1;
  padding: var(--spacing);
  overflow-y: auto;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 1000;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .content {
    width: 100%;
  }
}