:root {
    --bg-base: #121212;
    --bg-surface: #1e1e1e;
    --text-primary: #ffffff;
    --text-secondary: #aaaaaa;
    --accent-color: #00E676;
    --border-radius: 8px;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 40px;
    background-color: var(--bg-surface);
    border-bottom: 1px solid #333;
}

.logo { font-weight: bold; font-size: 1.2rem; letter-spacing: 1px; color: var(--accent-color); }

.site-nav a {
    color: var(--text-primary);
    text-decoration: none;
    margin-left: 20px;
    font-weight: bold;
    transition: color 0.2s ease;
}

.site-nav a:hover { color: var(--accent-color); }

.hero { text-align: center; padding: 80px 20px; border-bottom: 1px solid #333; }
.hero h1 { color: var(--accent-color); margin-bottom: 20px; font-size: 2.2rem; }
.hero p { color: var(--text-secondary); font-size: 1.2rem; }

.pillars-section { padding: 60px 20px; max-width: 1200px; margin: 0 auto; }

/* Auto-collapsing grid: 1 column on mobile, up to 4 on wide desktop */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.pillar-card {
    background-color: var(--bg-surface);
    padding: 30px;
    border-radius: var(--border-radius);
    border-top: 3px solid var(--accent-color);
    transition: transform 0.2s ease;
}

.pillar-card:hover { transform: translateY(-5px); }
.pillar-card h2 { margin-bottom: 15px; color: var(--text-primary); }
.pillar-card p { color: var(--text-secondary); }

.site-footer {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
    border-top: 1px solid #333;
    margin-top: 40px;
}

.cta-section {
    background-color: var(--bg-surface);
    padding: 60px 20px;
    text-align: center;
    border-top: 3px solid var(--accent-color);
    margin-top: 60px;
}

.cta-container {
    max-width: 800px;
    margin: 0 auto;
}

.cta-container h2 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 2rem;
}

.cta-container p {
    color: var(--text-secondary);
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.cta-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--bg-base);
    padding: 15px 30px;
    text-decoration: none;
    font-weight: bold;
    border-radius: var(--border-radius);
    transition: background-color 0.2s ease, transform 0.2s ease;
    font-size: 1.1rem;
}

.cta-button:hover {
    background-color: #00c853;
    transform: translateY(-3px);
}