/* Core Styling Variables and Reset */
body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background-color: #f8fafc;
    color: #1e293b;
    line-height: 1.6;
}

.container {
    width: 92%;
    max-width: 1140px;
    margin: 0 auto;
}

/* Header Design */
header {
    background-color: #0f172a;
    color: #ffffff;
    padding: 30px 0;
    border-bottom: 4px solid #00b46d;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
    letter-spacing: -0.5px;
}

.subtitle {
    margin: 5px 0 0 0;
    color: #94a3b8;
    font-size: 1rem;
}

nav a {
    color: #cbd5e1;
    text-decoration: none;
    margin-left: 20px;
    font-weight: 500;
    font-size: 0.95rem;
}

nav a:hover {
    color: #ffffff;
}

/* System Summary Box */
.hero-section {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: #ffffff;
    padding: 50px 0;
    border-bottom: 1px solid #334155;
}

.hero-section h2 {
    color: #00b46d;
    margin-top: 0;
}

.hero-section p {
    font-size: 1.1rem;
    color: #cbd5e1;
    max-width: 900px;
}

/* Main Layout Architecture */
.content-block {
    background-color: #ffffff;
    padding: 40px;
    margin: 35px 0;
    border-radius: 6px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
}

h2 {
    color: #0f172a;
    margin-top: 0;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 10px;
    font-size: 1.5rem;
}

/* Flex Grid System for Cards */
.grid-layout {
    display: flex;
    gap: 25px;
    flex-wrap: wrap;
    margin-top: 20px;
}

.card {
    flex: 1;
    min-width: 320px;
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    padding: 25px;
}

.card h3 {
    margin-top: 0;
    color: #00b46d;
    font-size: 1.2rem;
}

.sub-card {
    background-color: #ffffff;
    border-top: 3px solid #0f172a;
}

.sub-card h4 {
    margin-top: 0;
    font-size: 1.05rem;
    color: #0f172a;
}

ul {
    padding-left: 20px;
    margin: 0;
}

li {
    margin-bottom: 10px;
}

/* Leaflet Map Frame */
#map {
    height: 480px;
    width: 100%;
    border-radius: 6px;
    border: 1px solid #cbd5e1;
    margin-top: 20px;
}

/* Action Call Block */
.central-link {
    text-align: center;
    border: 2px solid #00b46d;
    background-color: #f0fdf4;
}

.btn-primary {
    display: inline-block;
    background-color: #0f172a;
    color: #ffffff;
    padding: 12px 28px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    margin-top: 15px;
    border: 1px solid #0f172a;
}

.btn-primary:hover {
    background-color: #00b46d;
    border-color: #00b46d;
}

footer {
    background-color: #0f172a;
    color: #64748b;
    text-align: center;
    padding: 25px 0;
    margin-top: 60px;
    font-size: 0.9rem;
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    header .container { flex-direction: column; text-align: center; }
    nav a { margin: 5px 10px; display: inline-block; }
}