.espacenet-container {
    max-width: 900px;
    margin: 30px 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
}

.espacenet-form {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 8px;
    border-left: 4px solid #0066cc;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.espacenet-form h3 {
    margin-top: 0;
    color: #333;
    font-size: 18px;
    font-weight: 600;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
    font-size: 14px;
}

.form-group input {
    width: 100%;
    max-width: 500px;
    padding: 10px 12px;
    font-size: 14px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: #0066cc;
    box-shadow: 0 0 0 2px rgba(0, 102, 204, 0.1);
}

.form-group small {
    display: block;
    margin-top: 6px;
    color: #666;
    font-size: 12px;
}

.btn-search {
    background-color: #0066cc;
    color: white;
    border: none;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s, box-shadow 0.2s;
}

.btn-search:hover {
    background-color: #0052a3;
    box-shadow: 0 2px 8px rgba(0, 102, 204, 0.3);
}

.btn-search:active {
    transform: translateY(1px);
}

#loading {
    text-align: center;
    color: #666;
    padding: 20px;
    font-size: 14px;
}

.patent-results {
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.patent-results h3 {
    margin-top: 0;
    color: #333;
    font-size: 18px;
    font-weight: 600;
    border-bottom: 2px solid #f0f0f0;
    padding-bottom: 15px;
}

.patent-table {
    width: 100%;
    border-collapse: collapse;
}

.patent-table tr {
    border-bottom: 1px solid #f0f0f0;
}

.patent-table tr:last-child {
    border-bottom: none;
}

.patent-table td {
    padding: 15px;
    vertical-align: top;
    color: #555
}

.patent-table td.label {
    font-weight: 600;
    color: #333;
    width: 200px;
    background-color: #f8f9fa;
}

.patent-table td.abstract {
    line-height: 1.6;
    color: #555;
    max-height: 200px;
    overflow-y: auto;
}

.patent-table a {
    color: #0066cc;
    text-decoration: none;
}

.patent-table a:hover {
    text-decoration: underline;
}

.error-message {
    background-color: #fee;
    border: 1px solid #fcc;
    color: #c33;
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
    font-size: 14px;
}

.error-message::before {
    content: "⚠️ ";
    margin-right: 8px;
}

/* Responsive */
@media (max-width: 768px) {
    .espacenet-container {
        margin: 20px 0;
    }
    
    .espacenet-form {
        padding: 20px;
    }
    
    .form-group input {
        max-width: 100%;
    }
    
    .patent-table td {
        padding: 12px;
        font-size: 14px;
    }
    
    .patent-table td.label {
        width: 120px;
        font-size: 13px;
    }
}