/* Reset & Base Styles */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --background-color: #f8f9fa;
    --text-color: #333;
    --white: #ffffff;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
    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;
}

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

.logo img {
    height: 40px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    margin-left: 20px;
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Main Content */
main {
    flex: 1;
    padding: 2rem 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
}

h1, h2, h3 {
    margin-bottom: 1rem;
    color: #2c3e50;
}

p {
    margin-bottom: 1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    text-decoration: none;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #0056b3;
}

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

.btn-secondary:hover {
    background-color: #545b62;
}

/* Progress Bar */
.progress-container {
    width: 100%;
    background-color: #e9ecef;
    border-radius: 10px;
    margin-bottom: 2rem;
    height: 10px;
    overflow: hidden;
}

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

/* Survey Options */
.options-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 2rem;
}

.option-label {
    display: flex;
    align-items: center;
    padding: 15px;
    border: 1px solid #dee2e6;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

.option-label:hover {
    background-color: #f1f3f5;
    border-color: var(--primary-color);
}

.option-label input[type="radio"] {
    margin-right: 10px;
}

/* Footer */
footer {
    background-color: #343a40;
    color: #adb5bd;
    padding: 2rem 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-links a {
    color: #adb5bd;
    text-decoration: none;
    margin-right: 15px;
    font-size: 0.9rem;
}

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

.contact-info p {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .nav-links {
        display: none; /* Mobile menu implementation needed if complex, simple for now */
    }
}