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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 2rem;
    font-size: 1.8rem;
}

.step-indicator {
    display: flex;
    justify-content: space-between;
    margin-bottom: 2rem;
    position: relative;
}

.step-indicator::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: #e0e0e0;
    z-index: 1;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 2;
    cursor: pointer;
    transition: all 0.3s ease;
}

.step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: #e0e0e0;
    color: #999;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    margin-bottom: 0.5rem;
    transition: all 0.3s ease;
}

.step-text {
    font-size: 0.9rem;
    color: #999;
    transition: all 0.3s ease;
}

.step.active .step-number {
    background-color: #3498db;
    color: white;
}

.step.active .step-text {
    color: #3498db;
    font-weight: bold;
}

.step.completed .step-number {
    background-color: #27ae60;
    color: white;
}

.step.completed .step-text {
    color: #27ae60;
}

.form-step {
    display: none;
    animation: fadeIn 0.3s ease;
}

.form-step.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-step h2 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
    font-size: 1.4rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #555;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid #eee;
}

.btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.btn:active {
    transform: translateY(0);
}

.prev-btn {
    background-color: #e0e0e0;
    color: #555;
}

.prev-btn:hover {
    background-color: #bdbdbd;
}

.next-btn,
.submit-btn,
.download-btn {
    background-color: #3498db;
    color: white;
}

.next-btn:hover,
.submit-btn:hover,
.download-btn:hover {
    background-color: #2980b9;
}

.result {
    text-align: center;
    padding: 2rem 0;
    animation: fadeIn 0.3s ease;
}

.result h2 {
    color: #2c3e50;
    margin-bottom: 1.5rem;
}

.result-content {
    max-width: 600px;
    margin: 0 auto;
}

.result-content p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: #555;
}

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

.loading {
    display: none;
    text-align: center;
    padding: 3rem 0;
    animation: fadeIn 0.3s ease;
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.loading-container {
    position: relative;
    width: 300px;
    height: 300px;
    margin: 2rem auto;
    perspective: 1000px;
}

.loading-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #3498db;
    animation: spin3d 2s linear infinite;
    transform-style: preserve-3d;
}

.loading-ring:nth-child(2) {
    width: 80%;
    height: 80%;
    top: 10%;
    left: 10%;
    border-top-color: #e74c3c;
    animation-duration: 3s;
    animation-direction: reverse;
}

.loading-ring:nth-child(3) {
    width: 60%;
    height: 60%;
    top: 20%;
    left: 20%;
    border-top-color: #2ecc71;
    animation-duration: 4s;
}

@keyframes spin3d {
    0% {
        transform: rotateX(0deg) rotateY(0deg) rotateZ(0deg);
    }
    100% {
        transform: rotateX(360deg) rotateY(360deg) rotateZ(360deg);
    }
}

.loading-text {
    position: relative;
    z-index: 10;
    color: #2c3e50;
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    text-align: center;
}

.loading-subtext {
    position: relative;
    z-index: 10;
    color: #7f8c8d;
    font-size: 1rem;
    text-align: center;
    max-width: 400px;
    line-height: 1.6;
}

.loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    opacity: 0.05;
    z-index: -1;
    animation: gradientShift 4s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% {
        opacity: 0.05;
    }
    50% {
        opacity: 0.1;
    }
}

@media (max-width: 768px) {
    .container {
        margin: 1rem;
        padding: 1.5rem;
    }
    
    .step-indicator {
        margin-bottom: 1.5rem;
    }
    
    .step-text {
        font-size: 0.8rem;
    }
    
    .form-navigation {
        flex-direction: column;
        gap: 1rem;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }
    
    .step-indicator::before {
        top: 15px;
    }
    
    .step-number {
        width: 30px;
        height: 30px;
        font-size: 0.9rem;
    }
    
    .step-text {
        display: none;
    }
}

.hidden {
    display: none !important;
}