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

:root {
  --color-bg: #f8f9fa;
  --color-text: #212529;
  --color-text-light: #6c757d;
  --color-primary: #0d6efd;
  --color-secondary: #6c757d;
  --color-border: #dee2e6;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --transition-slow: 0.3s ease;
  --transition-fast: 0.15s ease;
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;
  --border-radius: 8px;
}

body {
  font-family: 'Inter', sans-serif;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
}

header {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md);
  background-color: white;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 10;
}

h1 {
  font-weight: 600;
  font-size: 2rem;
  letter-spacing: -0.5px;
}

h2 {
  font-weight: 600;
  font-size: 1.75rem;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.3px;
}

/* Project styles */
.projects-container {
  padding: var(--spacing-md);
  max-width: 1400px;
  margin: 0 auto;
}

.project {
  margin-bottom: var(--spacing-xxl);
  padding: var(--spacing-lg);
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-slow);
}

.project:hover {
  box-shadow: var(--shadow-md);
}

.project-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.project-brief {
  margin: var(--spacing-md) 0;
  color: var(--color-text);
  font-size: 1.1rem;
  text-align: center;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.details-toggle {
  display: block;
  margin: var(--spacing-md) auto;
  padding: var(--spacing-xs) var(--spacing-lg);
  background: none;
  border: none;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-primary);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.details-toggle:hover {
  border-color: var(--color-primary);
}

.details-toggle:focus {
  outline: none;
  border-color: var(--color-primary);
}

.project-details {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), opacity var(--transition-slow);
  opacity: 0;
  max-width: 800px;
  margin: 0 auto;
}

.project-details.active {
  max-height: 500px;
  opacity: 1;
  padding-top: var(--spacing-md);
  padding-bottom: var(--spacing-md);
}

.project-details p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
  line-height: 1.6;
}

.project-details p:last-child {
  margin-bottom: 0;
}

/* Responsive styles */
@media (max-width: 768px) {
  .project {
    padding: var(--spacing-md);
  }
  
  h1 {
    font-size: 1.75rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .project-brief {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .project {
    padding: var(--spacing-sm);
  }
  
  h1 {
    font-size: 1.5rem;
  }
  
  h2 {
    font-size: 1.25rem;
  }
  
  .projects-container {
    padding: var(--spacing-xs);
  }
}