:root {
    --primary-color: #4e73df;
    --secondary-color: #858796;
    --success-color: #1cc88a;
    --info-color: #36b9cc;
    --warning-color: #f6c23e;
    --danger-color: #e74a3b;
    --light-bg: #f8f9fa;
    --dark-text: #5a5c69;
}

body {
    background-color: var(--light-bg);
    font-family: 'Nunito', 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    color: var(--dark-text);
    -webkit-font-smoothing: antialiased;
}

/* Card Styling */
.card {
    border: none;
    border-radius: 0.75rem;
    box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.1);
    transition: all 0.3s ease-in-out;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 0.5rem 2rem 0 rgba(58, 59, 69, 0.2);
}

/* Navbar */
.navbar {
    box-shadow: 0 0.15rem 1.75rem 0 rgba(58, 59, 69, 0.15);
}

.navbar-brand {
    font-weight: 800;
    color: var(--primary-color) !important;
    font-size: 1.5rem;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #4e73df 0%, #224abe 100%);
    color: white;
    padding: 80px 20px;
    text-align: center;
    border-radius: 1rem;
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjAiIGhlaWdodD0iMjAiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+PGNpcmNsZSBjeD0iMSIgY3k9IjEiIHI9IjEiIGZpbGw9InJnYmEoMjU1LDI1NSwyNTUsMC4xKSIvPjwvc3ZnPg=='); /* Subtle dot pattern */
    opacity: 0.3;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
}

.hero-desc {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto 2rem auto;
}

/* Feature Cards */
.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Question Styles */
.question-card {
    max-width: 900px;
    margin: 20px auto;
    padding: 30px;
}

.option-label {
    display: block;
    padding: 15px 20px;
    border: 2px solid #eaecf4;
    border-radius: 0.5rem;
    margin-bottom: 15px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
}

.option-label:hover {
    background-color: #eaecf4;
    border-color: #d1d3e2;
}

.option-input:checked + .option-label {
    background-color: #e8f5e9;
    border-color: #1cc88a;
    color: #1cc88a;
    box-shadow: 0 0 0 0.2rem rgba(28, 200, 138, 0.25);
}

.option-input {
    display: none;
}

/* Auth Cards (Login/Register) */
.auth-container {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-card {
    width: 100%;
    max-width: 450px;
    padding: 2rem;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .hero-section {
        padding: 50px 15px;
        text-align: center;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .question-card {
        padding: 15px;
        margin: 10px auto;
    }

    .display-4 {
        font-size: 2.5rem; /* Adjust large text on mobile */
    }
}