:root {
    --primary: #1a56db;
    --secondary: #1e40af;
    --text-main: #1f2937; /* Gray-800 - compliant contrast */
    --text-muted: #4b5563; /* Gray-600 - compliant contrast on white */
    --bg-light: #f9fafb;
    --w-white: #ffffff;
    --w-black: #111827;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--text-main);
    background-color: var(--bg-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
}

ul {
    list-style: none;
}

/* Layout Utilities */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.site-header {
    background: var(--w-white);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 50;
    padding: 1rem 0;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text-muted);
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--primary);
}

/* Hero Section */
.hero {
    background: var(--w-white);
    padding: 5rem 0;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.1;
    color: var(--w-black);
    margin-bottom: 1.5rem;
}

.hero-title .highlight {
    color: var(--primary);
    display: block;
}

.hero-text {
    max-width: 42rem;
    margin: 0 auto 2rem;
    font-size: 1.25rem;
    color: var(--text-muted);
}

.btn-primary {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    font-weight: 600;
    transition: background 0.2s;
}

.btn-primary:hover {
    background: var(--secondary);
}

/* Content Sections */
.content-section {
    padding: 4rem 1.5rem;
    max-width: 896px; /* 4Xl approx */
    margin: 0 auto;
}

.section-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--w-black);
    margin-bottom: 1.5rem;
}

.prose {
    font-size: 1.125rem;
    color: var(--text-muted);
}

.prose p {
    margin-bottom: 1.5rem;
}

/* Features Grid (Impact) */
.features-container {
    background: var(--w-white);
    padding: 2rem;
    border-radius: 0.75rem;
    border: 1px solid #e5e7eb;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    margin-bottom: 4rem;
}

.features-grid {
    display: grid;
    gap: 2rem;
    text-align: center;
}

@media (min-width: 768px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .hero-title {
        font-size: 3.75rem;
    }
}

.feature-number {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--primary);
    display: block;
    margin-bottom: 0.5rem;
}

.feature-title {
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--w-black);
    margin-bottom: 0.5rem;
}

/* Footer */
.site-footer {
    background: #111827; /* Gray-900 */
    color: white;
    padding: 3rem 0;
}

.footer-grid {
    display: grid;
    gap: 2rem;
}

@media (min-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-right {
        text-align: right;
    }
}

.footer-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-link {
    color: #9ca3af; /* Gray-400 */
    display: block;
    margin-bottom: 0.5rem;
}

.footer-link:hover {
    color: white;
}

.copyright {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    text-align: center;
    color: #6b7280;
    font-size: 0.875rem;
}