@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap');

:root {
    --primary-color: #007BFF;
    --secondary-color: #6c757d;
    --background-color: #f8f9fa;
    --text-color: #343a40;
    --light-color: #ffffff;
    --border-radius: 8px;
    --box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: var(--primary-color);
    color: var(--light-color);
    padding: 2rem 0;
    text-align: center;
    border-bottom: 5px solid #0056b3;
}

header h1 {
    font-size: 2.8rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

header p {
    font-size: 1.2rem;
    font-weight: 400;
}

nav {
    background: var(--light-color);
    padding: 1rem 0;
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav .container {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.nav-button {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-button:hover, .nav-button.active {
    background-color: var(--primary-color);
    color: var(--light-color);
}

main {
    padding: 2rem 0;
}

.content-section {
    display: none;
    background: var(--light-color);
    padding: 2.5rem;
    margin-bottom: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    animation: fadeIn 0.5s ease-in-out;
}

.content-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.content-section h2 {
    font-size: 2.2rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
    border-bottom: 2px solid #eee;
    padding-bottom: 1rem;
}

.content-flex {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.text-content {
    flex: 1;
}

.image-content {
    flex: 1;
}

.image-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
}

.text-content p, .text-content ul {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.text-content h3 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}

.text-content ul {
    list-style-type: none;
    padding-left: 0;
}

.text-content ul li {
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="%23007BFF" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M22 11.08V12a10 10 0 1 1-5.93-9.14"></path><polyline points="22 4 12 14.01 9 11.01"></polyline></svg>') no-repeat left center;
    padding-left: 2.5rem;
    margin-bottom: 0.8rem;
    background-size: 1.5rem;
}

footer {
    background: var(--text-color);
    color: var(--light-color);
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    nav .container {
        flex-direction: column;
        align-items: stretch;
    }

    .nav-button {
        width: 100%;
        text-align: center;
    }

    .content-flex {
        flex-direction: column;
    }

    .content-section h2 {
        font-size: 1.8rem;
    }
}