/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg-primary: #fafafa;
  --bg-card: #ffffff;
  --text-primary: #1a1a2e;
  --text-secondary: #64748b;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0f172a;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #818cf8;
    --accent-hover: #a5b4fc;
    --border: #334155;
  }
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
}

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

/* Header */
.header {
  padding: 4rem 1.5rem 3rem;
  text-align: center;
  background: linear-gradient(135deg, var(--accent) 0%, #8b5cf6 100%);
  color: white;
}

.header-content {
  max-width: 600px;
  margin: 0 auto;
}

.site-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.site-subtitle {
  font-size: 1.125rem;
  opacity: 0.9;
  font-weight: 400;
}

/* Main content */
.main-content {
  flex: 1;
  padding: 3rem 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* Tools grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

/* Tool card */
.tool-card {
  display: flex;
  flex-direction: column;
  padding: 1.75rem;
  background: var(--bg-card);
  border-radius: 1rem;
  border: 1px solid var(--border);
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #8b5cf6);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent);
}

.tool-card:hover::before {
  opacity: 1;
}

.tool-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  border-radius: 0.75rem;
}

.tool-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.tool-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  flex: 1;
  line-height: 1.5;
}

.tool-arrow {
  position: absolute;
  bottom: 1.75rem;
  right: 1.75rem;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  border-radius: 50%;
  color: var(--text-secondary);
  transition: all 0.3s ease;
}

.tool-card:hover .tool-arrow {
  background: var(--accent);
  color: white;
  transform: translateX(2px);
}

/* Footer */
.footer {
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 640px) {
  .header {
    padding: 3rem 1rem 2rem;
  }

  .site-title {
    font-size: 1.875rem;
  }

  .site-subtitle {
    font-size: 1rem;
  }

  .main-content {
    padding: 2rem 1rem;
  }

  .tools-grid {
    grid-template-columns: 1fr;
  }

  .tool-card {
    padding: 1.5rem;
  }
}