:root {
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --secondary: #3f37c9;
    --dark: #1a1a2e;
    --light: #f8f9fa;
    --success: #4cc9f0;
    --warning: #f8961e;
    --danger: #f72585;
    --border-radius: 12px;
    --box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: #f5f7ff;
    color: var(--dark);
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.app-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    width: 100%;
    transition: var(--transition);
}

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

.app-title {
    font-size: 2rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.app-subtitle {
    color: #64748b;
    font-weight: 400;
    margin-bottom: 1.5rem;
}

.question-display {
    background-color: #f8fafc;
    border: 2px dashed #cbd5e1;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    text-align: center;
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: var(--transition);
}

.question-text {
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--dark);
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    flex: 1;
    min-width: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

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

.btn-outline {
    background-color: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-outline:hover {
    background-color: rgba(67, 97, 238, 0.1);
}

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

.btn-warning:hover {
    background-color: #e07e0e;
    transform: translateY(-2px);
}

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

.btn-danger:hover {
    background-color: #e51779;
    transform: translateY(-2px);
}

.customize-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #e2e8f0;
}

.section-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--dark);
}

.customize-options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-label {
    font-size: 0.9rem;
    color: #64748b;
}

.select-box, .input-number {
    padding: 0.75rem;
    border: 1px solid #cbd5e1;
    border-radius: var(--border-radius);
    font-family: inherit;
    background-color: white;
    transition: var(--transition);
}

.select-box:focus, .input-number:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

.history-section {
    margin-top: 2rem;
}

.history-list {
    list-style: none;
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid #e2e8f0;
    border-radius: var(--border-radius);
    padding: 0.5rem;
}

.history-item {
    padding: 0.75rem;
    border-bottom: 1px solid #e2e8f0;
    cursor: pointer;
    transition: var(--transition);
}

.history-item:last-child {
    border-bottom: none;
}

.history-item:hover {
    background-color: #f8fafc;
}

.copy-notification {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--dark);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    opacity: 0;
    transition: var(--transition);
    z-index: 100;
}

.copy-notification.show {
    opacity: 1;
}

@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }
    
    .app-card {
        padding: 1.5rem;
    }
    
    .controls {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* Animation for new question */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.3s ease-out;
}