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

/* Body and container styling */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 20px;
    padding: 40px;
    max-width: 600px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* Step visibility & animation */
.step { display: none; opacity: 0; animation: fadeIn 0.5s forwards; }
.step.active { display: block; }
@keyframes fadeIn { to { opacity: 1; } }

h1 { color: #667eea; margin-bottom: 10px; font-size: 28px; }
h2 { color: #333; margin-bottom: 20px; font-size: 22px; }
.subtitle { color: #666; margin-bottom: 30px; font-size: 16px; }

.options { display: grid; gap: 15px; margin-bottom: 30px; }
.option {
    padding: 20px;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: white;
}
.option:hover {
    border-color: #667eea;
    background: #f8f9ff;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.2);
}
.option.selected { border-color: #667eea; background: #f0f3ff; }

.option h3 { color: #333; font-size: 18px; margin-bottom: 5px; }
.option p { color: #666; font-size: 14px; }

.checkbox-group { display: grid; gap: 10px; }
.checkbox-option {
    display: flex;
    align-items: center;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}
.checkbox-option:hover { border-color: #667eea; background: #f8f9ff; }
.checkbox-option.selected { border-color: #667eea; background: #f0f3ff; }
.checkbox-option input { margin-right: 12px; width: 20px; height: 20px; cursor: pointer; }

.btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 10px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    font-weight: 600;
}
.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.back-btn {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
    margin-bottom: 20px;
}
.back-btn:hover { background: #667eea; color: white; }

.progress {
    height: 4px;
    background: #e0e0e0;
    border-radius: 2px;
    margin-bottom: 30px;
    overflow: hidden;
}
.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transition: width 0.5s ease;
}

.results { animation: fadeIn 0.5s forwards; }
.result-section {
    margin-bottom: 30px;
    padding: 20px;
    background: #f8f9ff;
    border-radius: 12px;
    border-left: 4px solid #667eea;
}
.result-section h3 { color: #667eea; margin-bottom: 15px; font-size: 20px; }

.product {
    background: white;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 15px;
    border: 1px solid #e0e0e0;
}
.product h4 { color: #333; margin-bottom: 8px; font-size: 16px; }
.product p { color: #666; font-size: 14px; line-height: 1.6; }

.usage-badge {
    display: inline-block;
    background: #667eea;
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 13px;
    margin-top: 10px;
    font-weight: 600;
}

ul { margin-left: 20px; color: #666; line-height: 1.8; }
ul li { margin-bottom: 8px; }