:root {
    --primary-color: #007bff; /* Soft Blue */
    --primary-hover: #0056b3;
    --secondary-color: #28a745; /* Soft Green */
    --text-color: #333;
    --light-text: #666;
    --bg-color: #f8f9fa;
    --white: #ffffff;
    --border-color: #dee2e6;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    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;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 40px;
    width: auto;
}

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);
}

/* Mobile Menu */
.menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

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

.hero {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(135deg, #e3f2fd 0%, #ffffff 100%);
    border-radius: var(--radius);
    margin-bottom: 2rem;
}

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

.hero p {
    font-size: 1.2rem;
    color: var(--light-text);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Survey Card */
.survey-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

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

.options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.option-btn {
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    padding: 1rem;
    border-radius: var(--radius);
    cursor: pointer;
    text-align: left;
    font-size: 1.1rem;
    transition: all 0.3s;
}

.option-btn:hover, .option-btn.selected {
    border-color: var(--primary-color);
    background: #e3f2fd;
    color: var(--primary-color);
}

/* Content Section */
.content-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.content-section h2 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.content-section p {
    margin-bottom: 1rem;
    text-align: justify;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background-color: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--radius);
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: background 0.3s;
}

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

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

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

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

/* 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(--secondary-color);
    width: 0%;
    transition: width 0.5s ease;
}

/* Footer */
footer {
    background-color: #343a40;
    color: #fff;
    padding: 3rem 0;
    margin-top: auto;
}

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

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

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

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

.footer-links a {
    color: #adb5bd;
    text-decoration: none;
}

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

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #495057;
    color: #adb5bd;
}

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

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