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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 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%;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 10px;
    font-size: 2.5em;
    font-weight: 700;
}

.description {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    font-size: 1.1em;
}

.input-section {
    margin-bottom: 30px;
}

.chain-selector-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.chain-selector-wrapper label {
    font-weight: 600;
    color: #333;
    white-space: nowrap;
}

.chain-selector {
    padding: 8px 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    background: white;
    font-size: 14px;
    cursor: pointer;
    transition: border-color 0.3s ease;
    min-width: 120px;
}

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

.address-input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    margin-bottom: 15px;
    font-family: 'Courier New', monospace;
    transition: border-color 0.3s ease;
}

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

.check-button {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.check-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.check-button:active {
    transform: translateY(0);
}

.check-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.result {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 30px;
    border-left: 5px solid #28a745;
}

.result.contract {
    border-left-color: #ffc107;
}

.result.smart-wallet {
    border-left-color: #17a2b8;
}

.result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
}

.result-header h3 {
    margin: 0;
    color: #333;
}

.result-icon {
    font-size: 2em;
}

.result-details {
    color: #666;
    line-height: 1.6;
}

.result-details strong {
    color: #333;
}

.loading {
    text-align: center;
    padding: 30px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 10px;
    padding: 15px;
    margin-bottom: 20px;
    color: #721c24;
}

.hidden {
    display: none;
}

.info-section {
    background: #e9ecef;
    border-radius: 15px;
    padding: 25px;
    margin-top: 30px;
}

.info-section h3 {
    color: #333;
    margin-bottom: 15px;
}

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

.info-section li {
    margin-bottom: 10px;
    padding-left: 20px;
    position: relative;
    color: #555;
}

.info-section li:before {
    content: "▶";
    position: absolute;
    left: 0;
    color: #667eea;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
        margin: 10px;
    }
    
    h1 {
        font-size: 2em;
    }
    
    .address-input, .check-button {
        font-size: 14px;
    }
}