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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1f4a75, #195b7c, #143769);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header - placeholder */
.header {
    height: 80px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
    font-size: 24px;
    font-weight: bold;
    text-shadow: 1px 1px 2px rgba(255,255,255,0.5);
    margin-top: 40px;
}

/* Main container */
.main-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

/* Form container */
.form-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    padding: 30px;
    width: 100%;
    max-width: 800px;
    position: relative;
    backdrop-filter: blur(10px);
}

/* Close button */
.close-btn {
    position: absolute;
    top: 15px;
    right: 20px;
    background: none;
    border: none;
    font-size: 24px;
    color: #666;
    cursor: pointer;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.close-btn:hover {
    background: #f0f0f0;
    color: #333;
}

/* Form styles */
.form-title {
    text-align: center;
    color: #333;
    font-size: 28px;
    margin-bottom: 30px;
    font-weight: 600;
}

.step {
    margin-bottom: 25px;
    padding: 20px;
    border-radius: 10px;
    background: #f8f9fa;
    border-left: 4px solid #b77a23;
}

.step-title {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.step-number {
    background: #b77126;
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 10px;
    font-size: 14px;
    font-weight: bold;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #555;
}

input, select {
    width: 100%;
    padding: 10px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s ease;
}

input:focus, select:focus {
    outline: none;
    border-color: #a47430;
}

.radio-group {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.radio-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin-top: 10px;
}

.checkbox-item {
    background: white;
    padding: 15px;
    border-radius: 8px;
    border: 2px solid #e0e0e0;
    transition: all 0.3s ease;
    cursor: pointer;
}

.checkbox-item:hover {
    border-color: #1f4c6c;
    transform: translateY(-2px);
}

.checkbox-item.selected {
    border-color: #b17720;
    background: #f0f8f7;
}

.checkbox-item input {
    margin-right: 10px;
}

.checkbox-title {
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.checkbox-desc {
    font-size: 12px;
    color: #666;
}

.calculate-btn {
    background: linear-gradient(135deg, #b37325, #ba8729);
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    margin-top: 20px;
    transition: transform 0.3s ease;
}

.calculate-btn:hover {
    transform: translateY(-2px);
}

.results {
    margin-top: 30px;
    padding: 25px;
    background: linear-gradient(135deg, #e8f5f3, #f0f8f7);
    border-radius: 15px;
    border: 2px solid #2d6e96;
    display: none;
}

.results.show {
    display: block;
    animation: slideIn 0.5s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-title {
    font-size: 24px;
    color: #2d5a54;
    margin-bottom: 20px;
    text-align: center;
    font-weight: bold;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.result-card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.result-value {
    font-size: 28px;
    font-weight: bold;
    color: #2d5a54;
    margin-bottom: 5px;
}

.result-label {
    color: #666;
    font-size: 14px;
}

.selected-devices {
    background: white;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 15px;
}

/* Footer - placeholder */
.footer {
    height: 60px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
    font-size: 14px;
}

@media (max-width: 768px) {
    .form-container {
        margin: 10px;
        padding: 20px;
    }
    
    .radio-group {
        flex-direction: column;
    }
    
    .checkbox-group {
        grid-template-columns: 1fr;
    }
}