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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #2c3e2f;
    background-color: #faf7f2;
}

header {
    background: #ffffff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 600;
    text-decoration: none;
    color: #5a7c5e;
    letter-spacing: 1px;
}

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

.nav-links a {
    text-decoration: none;
    color: #2c3e2f;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #8ba888;
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

.hero {
    background: linear-gradient(135deg, #e6f0e6 0%, #faf7f2 100%);
    padding: 4rem 2rem;
    border-radius: 20px;
    text-align: center;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #5a7c5e;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 2rem;
}

.btn {
    display: inline-block;
    background: #5a7c5e;
    color: white;
    padding: 0.8rem 2rem;
    text-decoration: none;
    border-radius: 40px;
    transition: background 0.3s;
    font-weight: 500;
}

.btn:hover {
    background: #3e5a41;
}

.grid-2col {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.card {
    background: white;
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-4px);
}

.card h3 {
    margin-bottom: 1rem;
    color: #5a7c5e;
}

.flipbook-container {
    width: 100%;
    height: 80vh;
    min-height: 600px;
    margin: 2rem 0;
    border: none;
    border-radius: 8px;
    overflow: hidden;
}

footer {
    background: #e2e6df;
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
    color: #4a5c4a;
    font-size: 0.9rem;
}

footer a {
    color: #5a7c5e;
    text-decoration: none;
}

@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }
    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    .hero h1 {
        font-size: 1.8rem;
    }
    .hero p {
        font-size: 1rem;
    }
}