:root {
    --primary-dark: #1a2421;
    --accent-gold: #f3a847;
    --text-white: #ffffff;
}

.container { width: 90%; max-width: 1200px; margin: 0 auto; }
.text-center { text-align: center; }

/* Header Styling */
.site-header { background: var(--primary-dark); padding: 20px 0; border-bottom: 2px solid #2a3a35; }
.header-flex { display: flex; justify-content: space-between; align-items: center; }
.logo .extent { color: #43f1ff; font-weight: bold; font-size: 24px; }
.logo .research { color: var(--text-white); font-size: 24px; }

/* Hero Section */
.hero-section { background: #232f2b; color: white; padding: 60px 0; }
.search-box input { width: 60%; padding: 12px; border: none; }
.search-box button { padding: 12px 30px; background: var(--accent-gold); border: none; cursor: pointer; font-weight: bold; }

/* Feature Grid (Responsive) */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin-top: -40px; }
.feature-card { background: #2d3d38; color: white; padding: 25px; border: 1px solid #444; text-align: center; }

/* 2-Column Layout */
.content-area { display: flex; gap: 30px; margin-top: 50px; }
.main-content { flex: 2; }
.sidebar-news { flex: 1; background: #f9f9f9; padding: 15px; border: 1px solid #ddd; }

/* Mobile Optimization */
@media (max-width: 768px) {
    .content-area { flex-direction: column; }
    .search-box input { width: 100%; margin-bottom: 10px; }
    .header-flex { flex-direction: column; }
}