:root {
    --primary: #4e73df;
    --dark-bg: #2c3e50;
    --light-bg: #f8f9fc;
}

body {
    background-color: var(--light-bg);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.navbar-custom {
    background-color: var(--dark-bg);
}

.card-quiz {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    margin-bottom: 20px;
}

.btn-primary { background-color: var(--primary); border: none; }

.feedback-area {
    padding: 15px;
    border-radius: 0 0 12px 12px;
    font-weight: bold;
}

.form-container {
    max-width: 500px;
    margin: 50px auto;
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.input-group-text {
    background-color: var(--primary);
    color: white;
    border: none;
}

.loading-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(255,255,255,0.8);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

:root {
    --primary: #4e73df;
    --secondary: #224abe;
    --bg-light: #f8f9fc;
    --text-dark: #2c3e50;
}

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

.btn-primary {
    background-color: var(--primary);
    border: none;
    transition: all 0.3s;
}

.btn-primary:hover {
    background-color: var(--secondary);
    transform: translateY(-2px);
}

.card {
    border: none;
    border-radius: 12px !important;
}