/* 1. Global Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ece8df;
}

/* 2. Header and Navigation */
.header {
    background-color: #1a252f;
    color: #fff;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.nav a {
    color: #fff;
    text-decoration: none;
    margin-left: 1.5rem;
}

/* 3. Main Layout Structure (Mobile-First) */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 1fr; /* Single column on mobile */
    gap: 2rem;
}

.main-content {
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.sidebar {
    background: #eef2f3;
    padding: 2rem;
    border-radius: 8px;
}

/* Internal Inner Feature Card Layout */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.card {
    background: #fdfdfd;
    padding: 1.5rem;
    border: 1px solid #ddd;
    border-radius: 6px;
}

/* 4. Footer */
.footer {
    background-color: #1a252f;
    color: #fff;
    text-align: center;
    padding: 1.5rem;
    margin-top: 3rem;
}

/* 5. Desktop Breakpoint */
@media (min-width: 768px) {
    .container {
        /* Desktop: Main content occupies 3 parts, Sidebar occupies 1 part */
        grid-template-columns: 3fr 1fr;
    }
}