:root {
    --primary: #0077B6;
    --secondary: #FFB703;
    --bg-color: #ffffff;
    --text-color: #171717;
    --text-muted: #4a4a4a;
    --border-color: #e5e5e5;
    --card-bg: #fdfdfd;
    --font-main: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --transition: all 0.3s ease;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    line-height: 1.6;
    font-size: 18px; /* Slightly larger for senior readability */
    -webkit-font-smoothing: antialiased;
}

/* Layout Containers */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Navigation */
header {
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
}

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

/* Hero Section */
.hero {
    position: relative;
    padding: 100px 0;
    background: linear-gradient(rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0.6)), 
                url('hero-reunion.jpg') center/cover no-repeat;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
    font-weight: 800;
}

.hero p {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto 2rem;
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: #005f91;
    box-shadow: 0 4px 12px rgba(0, 119, 182, 0.2);
}

.btn-secondary {
    background-color: var(--secondary);
    color: #171717; /* High contrast for yellow */
}

.btn-secondary:hover {
    background-color: #e6a600;
    box-shadow: 0 4px 12px rgba(255, 183, 3, 0.2);
}

/* Content Sections */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2.25rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--secondary);
    margin: 0 auto;
}

/* Cards & Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    border-color: var(--primary);
}

.card h3 {
    color: var(--primary);
    margin-bottom: 1rem;
}

/* Typography & Accents */
h1, h2, h3, h4 {
    line-height: 1.2;
}

a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 4px;
}

a:hover {
    color: var(--secondary);
}

.accent-text {
    color: var(--primary);
    font-weight: 700;
}

.highlight {
    border-left: 4px solid var(--secondary);
    padding-left: 1rem;
    margin: 1.5rem 0;
}

/* Footer */
footer {
    background-color: #f8f9fa;
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    .nav-links {
        display: none; /* Mobile menu logic required for JS */
    }
    section {
        padding: 40px 0;
    }
}