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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: #333;
}

.container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 800px;
    width: 100%;
    padding: 40px;
    animation: fadeIn 0.5s ease-in;
}

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

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-size: 2.5rem;
    color: #667eea;
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    font-size: 1rem;
}

main {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.input-section,
.output-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

label {
    font-weight: 600;
    color: #444;
    font-size: 1.1rem;
}

textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    font-family: 'Courier New', monospace;
    resize: vertical;
    transition: border-color 0.3s;
}

textarea:focus {
    outline: none;
    border-color: #667eea;
}

textarea::placeholder {
    color: #aaa;
}

#output {
    background-color: #f8f9fa;
}

.button-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

button {
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    flex: 1;
    min-width: 120px;
}

.primary-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

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

.secondary-btn:hover {
    background: #e0e0e0;
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

.info-box {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid #667eea;
}

.info-box h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.info-box ul {
    list-style: none;
    padding-left: 0;
}

.info-box li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
    color: #555;
}

.info-box li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    color: #999;
    font-size: 0.9rem;
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 2rem;
    }

    .button-group {
        flex-direction: column;
    }

    button {
        width: 100%;
    }
}