:root {
  --csa-primary: #0F4C81;
  --csa-secondary: #1A73E8;
  --csa-accent: #FF6B35;
  --csa-bg: #F8FAFC;
  --csa-text: #1E293B;
  --csa-muted: #64748B;
  --csa-card: #FFFFFF;
  --shadow: 0 4px 12px rgba(0,0,0,0.08);
  --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Inter', sans-serif; background: var(--csa-bg); color: var(--csa-text); line-height: 1.6; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

.csa-header { background: var(--csa-card); box-shadow: var(--shadow); position: sticky; top: 0; z-index: 100; }
.csa-header .container { padding: 15px 20px; }
.csa-logo { font-size: 1.5rem; font-weight: 700; color: var(--csa-primary); text-decoration: none; display: flex; align-items: center; gap: 8px; }
.logo-icon { background: var(--csa-primary); color: white; width: 32px; height: 32px; border-radius: 8px; display: flex; align-items: center; justify-content: center; }
.csa-nav a { margin-left: 25px; text-decoration: none; color: var(--csa-text); font-weight: 500; }
.csa-nav a:hover { color: var(--csa-secondary); }
.mobile-menu-btn { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; }

.hero { background: linear-gradient(135deg, #0F4C81 0%, #1A73E8 100%); color: white; padding: 80px 0; }
.hero h1 { font-size: 2.8rem; margin-bottom: 15px; }
.csa-brand { color: var(--csa-accent); }
.hero p { font-size: 1.2rem; margin-bottom: 30px; opacity: 0.9; }
.btn-primary { background: var(--csa-accent); color: white; padding: 14px 32px; border-radius: var(--radius); text-decoration: none; font-weight: 600; transition: 0.2s; display: inline-block; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 15px rgba(255,107,53,0.3); }

.tools-section { padding: 60px 0; }
.section-title { font-size: 2rem; margin-bottom: 40px; color: var(--csa-primary); }
.tools-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 25px; }
.tool-card { background: var(--csa-card); padding: 30px; border-radius: var(--radius); box-shadow: var(--shadow); text-decoration: none; color: inherit; transition: 0.2s; border: 1px solid #E2E8F0; }
.tool-card:hover { transform: translateY(-5px); box-shadow: 0 10px 25px rgba(0,0,0,0.1); border-color: var(--csa-secondary); }
.tool-icon { font-size: 2.5rem; margin-bottom: 15px; }
.tool-card h3 { margin-bottom: 10px; color: var(--csa-primary); }
.tool-card p { color: var(--csa-muted); font-size: 0.95rem; }

.csa-footer { background: #0F172A; color: #94A3B8; padding: 30px 0; margin-top: 60px; }
.csa-footer a { color: var(--csa-secondary); text-decoration: none; }

@media (max-width: 768px) {
  .csa-nav { display: none; }
  .mobile-menu-btn { display: block; }
  .hero h1 { font-size: 2rem; }
}