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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #7d40ef 0%, #7506e4 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    padding: 40px;
    max-width: 600px;
    width: 100%;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.header h1 {
    color: #2c3e50;
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #7d40ef, #7506e4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header p {
    color: #7f8c8d;
    font-size: 1.1rem;
    line-height: 1.6;
}

.conversion-selector {
    margin-bottom: 30px;
}

.conversion-selector label {
    display: block;
    color: #34495e;
    font-weight: 600;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.conversion-selector select {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    font-size: 1rem;
    background-color: white;
    color: #2c3e50;
    cursor: pointer;
    transition: all 0.3s ease;
}

.conversion-selector select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.input-section {
    display: grid;
    grid-template-columns: 1fr 60px 1fr;
    gap: 20px;
    align-items: end;
    margin-bottom: 30px;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    color: #34495e;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.input-group input {
    padding: 15px 20px;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    background-color: #f8f9fa;
}

.input-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background-color: white;
}

.input-group input[readonly] {
    background-color: #f1f3f4;
    color: #2c3e50;
    font-weight: 600;
}

.swap-button {
    background: linear-gradient(135deg, #7d40ef, #7506e4);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.swap-button:hover {
    transform: rotate(180deg) scale(1.1);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.info-section {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 30px;
    border-left: 5px solid #7d40ef;
}

.info-section h3 {
    color: #2c3e50;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.info-section p {
    color: #5a6c7d;
    line-height: 1.6;
    font-size: 0.95rem;
}

.conversion-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-top: 15px;
}

.detail-item {
    background: white;
    padding: 15px;
    border-radius: 10px;
    border: 1px solid #e9ecef;
}

.detail-item strong {
    color: #7d40ef;
    display: block;
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.detail-item span {
    color: #2c3e50;
    font-size: 1.1rem;
    font-weight: 600;
}

.footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e9ecef;
}

.footer p {
    color: #7f8c8d;
    font-size: 0.9rem;
    line-height: 1.5;
}

.footer a {
    color: #7d40ef;
    text-decoration: none;
    font-weight: 600;
}

.footer a:hover {
    text-decoration: underline;
}

.price-section {
    background: linear-gradient(135deg, #e8f4fd, #d4edda);
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 30px;
    border-left: 5px solid #28a745;
}

.price-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 15px;
}

.price-item {
    background: white;
    padding: 15px;
    border-radius: 10px;
    border: 1px solid #e9ecef;
    text-align: center;
}

.conversion-value {
    background: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    font-size: 1.2rem;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
        margin: 10px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
    
    .input-section {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .swap-button {
        justify-self: center;
        transform: rotate(90deg);
    }
    
    .conversion-details {
        grid-template-columns: 1fr;
    }
}

.warning {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    color: #856404;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.success {
    background: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 0.9rem;
}