:root {
    --primary-color: #0056b3;
    --secondary-color: #004494;
    --accent-color: #eef2f6;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --success-color: #28a745;
    --border-radius: 8px;
    --container-width: 800px;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

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

/* Header */
header {
    background-color: var(--bg-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1rem;
}

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

.logo {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

nav ul {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.2s;
}

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

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

.card {
    background: var(--bg-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
}

h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

p {
    margin-bottom: 1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    border: none;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
    text-align: center;
}

.btn:hover {
    background-color: var(--secondary-color);
}

.btn-secondary {
    background-color: #6c757d;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

/* Progress Bar */
.progress-container {
    margin-bottom: 2rem;
    background-color: #e9ecef;
    border-radius: 10px;
    height: 10px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--success-color);
    width: 0%;
    transition: width 0.3s ease;
}

/* Options */
.options-grid {
    display: grid;
    gap: 1rem;
    margin: 2rem 0;
}

.option-card {
    border: 2px solid #e9ecef;
    padding: 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s;
}

.option-card:hover {
    border-color: var(--primary-color);
    background-color: var(--accent-color);
}

.option-card.selected {
    border-color: var(--primary-color);
    background-color: #e7f1ff;
}

/* Footer */
footer {
    background-color: #fff;
    border-top: 1px solid #eee;
    padding: 2rem 0;
    margin-top: auto;
    font-size: 0.9rem;
    color: var(--text-light);
}

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

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

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
}

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

/* Mobile */
@media (max-width: 600px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    .card {
        padding: 1.5rem;
    }
}