:root {
    --primary-color: #0056b3;
    --secondary-color: #00a8cc;
    --accent-color: #ffa500;
    --text-color: #333;
    --bg-color: #f4f7f6;
    --white: #ffffff;
    --light-gray: #e9ecef;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --font-main: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
header {
    background-color: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    padding: 1rem 0;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 40px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Main Content */
main {
    flex: 1;
    padding: 2rem 0;
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
    background: var(--white);
    padding: 3rem 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.hero p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s, transform 0.2s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn:hover {
    background-color: #004494;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: var(--light-gray);
    color: var(--text-color);
}

.btn-secondary:hover {
    background-color: #dbe2e8;
}

/* Question Page Styles */
.question-container {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
}

.progress-bar-container {
    background-color: var(--light-gray);
    border-radius: 10px;
    height: 10px;
    margin-bottom: 2rem;
    overflow: hidden;
}

.progress-bar {
    background-color: var(--secondary-color);
    height: 100%;
    width: 0%;
    transition: width 0.5s ease;
}

.question-title {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.option-card {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
}

.option-card:hover {
    border-color: var(--secondary-color);
    background: #e6f7fa;
}

.option-card.selected {
    border-color: var(--primary-color);
    background: #e6f0fa;
    font-weight: bold;
}

.content-block {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--light-gray);
    font-size: 1rem;
    color: #555;
    text-align: justify;
}

.content-block h2 {
    color: var(--text-color);
    margin-bottom: 1rem;
    margin-top: 1.5rem;
}

.navigation-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
}

/* Footer */
footer {
    background-color: #2c3e50;
    color: var(--white);
    padding: 3rem 0 1rem;
    margin-top: auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-col h3 {
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 0.5rem;
}

.footer-col a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-col a:hover {
    color: var(--white);
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #34495e;
    color: #7f8c8d;
    font-size: 0.9rem;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h1 {
        font-size: 2rem;
    }
    
    .navigation-buttons {
        flex-direction: column-reverse;
        gap: 1rem;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
}