/* ==========================================================================
   Design System: OnwardsLab
   ========================================================================== */

:root {
  /* Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --text-main: #0f172a;
  --text-muted: #475569;
  --brand-color: #2563eb;
  --brand-hover: #1d4ed8;
  --border-color: #e2e8f0;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  /* Spacing & Layout */
  --max-width: 1200px;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  --radius: 6px;
}

/* Reset & Base */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  color: var(--text-muted);
  background-color: var(--bg-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { color: var(--text-main); font-weight: 600; line-height: 1.2; }
a { color: var(--brand-color); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--brand-hover); }
img { max-width: 100%; height: auto; display: block; }

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}
.section { padding: var(--spacing-xl) 0; }
.section-alt { background-color: var(--bg-secondary); border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }

/* Components */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-primary);
  position: sticky;
  top: 0;
  z-index: 100;
}
.logo { font-size: 1.25rem; font-weight: 700; color: var(--text-main); letter-spacing: -0.02em; }
.nav-links { display: flex; gap: var(--spacing-lg); align-items: center; }
.nav-links a { color: var(--text-muted); font-weight: 500; font-size: 0.95rem; }
.nav-links a:hover { color: var(--text-main); }

.btn {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 0.95rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-primary { background: var(--text-main); color: var(--bg-primary); border: 1px solid var(--text-main); }
.btn-primary:hover { background: #000; color: #fff; }
.btn-outline { background: transparent; color: var(--text-main); border: 1px solid var(--border-color); }
.btn-outline:hover { border-color: var(--text-main); }

/* Hero Section */
.hero {
  padding: 6rem 0;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}
.hero h1 { font-size: 3.5rem; letter-spacing: -0.03em; margin-bottom: var(--spacing-md); }
.hero p { font-size: 1.25rem; margin-bottom: var(--spacing-lg); }
.hero-actions { display: flex; gap: var(--spacing-md); justify-content: center; }

/* Grid & Cards */
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--spacing-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: var(--spacing-lg); }

.card {
  padding: var(--spacing-lg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.03); }
.card h3 { margin-bottom: var(--spacing-sm); font-size: 1.25rem; }
.card p { font-size: 0.95rem; }

/* Footer */
.footer {
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
}
.footer-grid { display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--spacing-lg); }
.footer-col { display: flex; flex-direction: column; gap: var(--spacing-sm); }
.footer-col strong { color: var(--text-main); }

@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  .nav-links { display: none; /* In production, toggled via JS */ }
}