:root {
    --primary-color: #4CAF50;
    --accent-color: #FFC107;
    --bg-color: #F5F7FA;
    --surface-color: #FFFFFF;
    --text-color: #212529;
    --heading-font: 'Georgia', 'Times New Roman', serif;
    --body-font: 'Helvetica Neue', Arial, sans-serif;
    --border-radius: 12px;
}

body {
    font-family: var(--body-font);
    background-color: var(--bg-color);
    color: var(--text-color);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--heading-font);
    font-weight: 700;
}

.navbar {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.hero {
    background: linear-gradient(rgba(0, 0, 0, 0.3), rgba(0, 0, 0, 0.1)), url('https://picsum.photos/seed/recyclehero-hero/1600/900') no-repeat center center;
    background-size: cover;
    color: white;
    padding: 12rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 4.5rem;
    font-weight: 900;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.hero p {
    font-size: 1.5rem;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    border-radius: var(--border-radius);
    padding: 1rem 2rem;
    font-weight: bold;
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    background-color: #45a049;
    border-color: #45a049;
}

.section {
    padding: 6rem 0;
}

.section-card {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.section-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 20px rgba(0,0,0,0.15);
}

.section-card img {
    border-radius: var(--border-radius);
}

footer {
    background-color: var(--text-color);
    color: var(--bg-color);
    padding: 2rem 0;
    text-align: center;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}